# Signal Relay, 12 VDC, DPDT, 4 A, HFD3 Series, Through Hole, Non Latching
**URL**: https://novapart.co/products/HFD3/12/signal-relay-12-vdc-dpdt-4-a-hfd3-series-through
**SKU**: HFD3/12
**Manufacturer**: HONGFA
**Category**: Switches & Relays || Relays || Signal Relays
**Price**: €1.2700
**Stock**: 1000+
**Lead Time**: 190 days (indicative)
## Specifications
| Parameter | Value |
|---|---|
| Svhc | No SVHC (25-Jun-2025) |
| Coil Type | Non Latching |
| Coil Voltage | 12VDC |
| Product Range | HFD3 Series |
| Relay Mounting | Through Hole |
| Coil Resistance | 1.028kohm |
| Contact Current | 4A |
| Relay Terminals | PC Pin |
| Contact Material | Silver Nickel |
| Contact Voltage Vac | 277V |
| Contact Voltage Vdc | 220V |
| Contact Configuration | DPDT |
## Datasheet
📄 [Download PDF](https://novapart.co/datasheet/farnell:4733556/)
## **HFD3**
## **SUBMINIATURE SIGNAL RELAY**
## **Features**
**==> picture [95 x 89] intentionally omitted <==**
**----- Start of picture text -----**
File No.:E133481
V
D E
QD
File No.:40018867
File No.:CQC1400207409
**----- End of picture text -----**
- Surge withstand voltage up to 2.5kV
- Contact arrangement: 2 Form A,2 Form C available
- Meets EN60950 / EN41003
- SMT and THT types available
- Bifurcated contacts
- Single side stable and latching type available
**RoHS compliant**
## **CONTACT DATA**
**==> picture [220 x 190] intentionally omitted <==**
**----- Start of picture text -----**
Contact arrangement 2A,2C
Contact resistance 100m Q max.(at 10mA 30mVDC)
Contact material AgNi + Au plated
2A 30VDC
Contact rating
3A 30VDC
(Res. load)
0.5A 125VAC
Max. switching current 4A
Max. switching voltage 277VAC / 220VDC
Max. switching power 62.5VA / 90W
Min. applicable load [1)] 10mV 10µA
Mechanical endurance 1 x 10 [8] OPS
1 x 10 [5] OPS (0.5A 125VAC,
Electrical endurance [2)]
Resistive load, AgNi + Au plated,
at 85oC,1s on 9s off)
**----- End of picture text -----**
**Notes:** 1) Min. applicable load is reference value. Please perform the confirmation test with the actual load before production since reference value may change according to switching frequencies, environmental conditions and expected contact resistance and reliability.
- 2) Electric endurance data are collected in one pair CO contact test.
## **CHARACTERISTICS**
|Insulation resistance|Insulation resistance|Insulation resistance|1000M
(at 500VDC)
Q|
|---|---|---|---|
|Dielectric
strength|Between coil & contacts
~~|~~||2000VAC 1min|
||Between open contacts||1000VAC 1min|
||Between contact sets||1500VAC 1min|
|Between open contacts (10/160µs)
Between coil & contacts (2/10µs)
Surge withstand voltage|||1500V (FCC part 68)
2500V (Telecordia)|
|Operate time (Set time)|||4ms max.|
|Release time (Reset time)|||4ms max.|
|Ambient temperature|||-40
to 85
,-40
to 105
°C
°C
°C
°C|
|Humidity|||5% to 85% RH|
|Vibration resistance|||10Hz to 55Hz 3.3mm DA|
|Shock
resistance||Functional|735m/s
2|
|||Destructive|980m/s
2|
|Termination|||THT, SMT|
|Unit weight|||Approx. 2.3g|
|Moisture sensitivity levels (Only for
SMT type, JEDEC-STD-020)|||MSL-3|
|Construction|||Plastic sealed|
**Notes:** 1) The data shown above are initial values.
## **SAFETY APPROVAL RATINGS**
|**UL/CUL**|AgNi + Au plated|2A 30VDC at 85
3A 30VDC at 85
0.5A 125VAC at 85
°C
°C
°C|
|---|---|---|
|**VDE**|AgNi + Au plated|2A 30VDC at 85
3A 30VDC at 70
0.5A 125VAC at 85
°C
°C
°C|
- 2) Specification (888) series, applicable for high-temperature environments up to 105 ℃.
## **COIL**
|**COIL**|||
|---|---|---|
|Coil power|Single side stable|Approx. 140mW|
||1 coil latching|Approx. 100mW|
||2 coils latching|Approx. 200mW|
|Temperature rise|50K max.||
**Notes:** 1) All values unspecified are at room temperature. 2) Only typical loads are listed above. Other load specifications can be available upon request.
## HONGFA RELAY
2026 Rev. 2.00
ISO9001, IATF16949 , ISO14001, ISO45001, IECQ QC 080000, ISO/IEC 27001 CERTIFIED
23
## **COIL DATA**
at 23
## **Single side stable**
|**Single side stable**|||||||
|---|---|---|---|---|---|---|
|Coil Code|Nominal
Voltage
VDC1)|Initial
Set Voltage
VDC
max.1)|Initial
Reset Voltage
VDC
max.1)|Coil
Resistance|Nominal
Power
mW
approx.|Max.
Voltage
VDC5)|
|HFD3/1.5|1.5|1.13|0.15|16 x (1
10%)|140|3.0|
|HFD3/2.4|2.4|1.8|0.24|41 x (1
10%)|140|4.8|
|HFD3/3|3|2.25|0.3|64.3 x (1
10%)|140|6.0|
|HFD3/4.5|4.5|3.38|0.45|145 x (1
10%)|140|9.0|
|HFD3/5|5|3.75|0.5|178 x (1
10%)|140|10|
|HFD3/6|6|4.5|0.6|257 x (1
10%)|140|12|
|HFD3/9|9|6.75|0.9|579 x (1
10%)|140|18|
|HFD3/12|12|9|1.2|1028 x (1
10%)|140|24|
|HFD3/24|24|18|2.4|4114 x (1
10%)|140|48|
|HFD3/48|48|36|4.8|8533 x (1
10%)|270|62.5|
## **1 coil latching**
|Coil Code|Nominal
Voltage
VDC1)|Initial
Set Voltage
VDC
max.1)|Initial
Reset Voltage
VDC
max.1)|Coil
Resistance|Nominal
Power
mW
approx.|Max.
Voltage
VDC5)|
|---|---|---|---|---|---|---|
|HFD3/1.5-L1|1.5|1.13|1.13|22.5 x (1
10%)|100|3.0|
|HFD3/2.4-L1|2.4|1.8|1.8|58 x (1
10%)|100|4.8|
|HFD3/3-L1|3|2.25|2.25|90 x (1
10%)|100|6.0|
|HFD3/4.5-L1|4.5|3.38|3.38|203 x (1
10%)|100|9.0|
|HFD3/5-L1|5|3.75|3.75|250 x (1
10%)|100|10|
|HFD3/6-L1|6|4.5|4.5|360 x (1
10%)|100|12|
|HFD3/9-L1|9|6.75|6.75|810 x (1
10%)|100|18|
|HFD3/12-L1|12|9|9|1440 x (1
10%)|100|24|
|HFD3/24-L1|24|18|18|5760 x (1
10%)|100|48|
## **2 coils latching**
|Coil Code|Nominal
Voltage
VDC1)|Initial
Set Voltage
VDC
max.
VDC1)|Initial
Reset Voltage
VDC
max.1)|Coil
Resistance|Nominal
Power
mW
approx.|Max.
Voltage
VDC5)|
|---|---|---|---|---|---|---|
|HFD3/1.5-L2|1.5|1.13|1.13|11.2 x (1
10%)|200|3.0|
|HFD3/2.4-L2|2.4|1.8|1.8|29 x (1
10%)|200|4.8|
|HFD3/3-L2|3|2.25|2.25|45 x (1
10%)|200|6.0|
|HFD3/4.5-L2|4.5|3.38|3.38|101 x (1
10%)|200|9.0|
|HFD3/5-L2|5|3.75|3.75|125 x (1
10%)|200|10|
|HFD3/6-L2|6|4.5|4.5|180 x (1
10%)|200|12|
|HFD3/9-L2|9|6.75|6.75|405 x (1
10%)|200|18|
|HFD3/12-L2|12|9|9|720 x (1
10%)|200|24|
|HFD3/24-L2|24|18|18|2880 x (1
10%)|200|48|
24
at 23
## **COIL DATA**
**Notes:** 1) The data shown above are initial values.
- 2) To supply rated step voltage to coil is the foundation of relay proper operation. Please make sure the applied voltage to the coil reach at rated values.
Please refer to the typical diagram below for single side stable relay. The "V_coil" is the rated voltage:
**==> picture [170 x 151] intentionally omitted <==**
**----- Start of picture text -----**
VCC
RES2 V_coil
RELAY DIODE V
Port1
RES1
GND
**----- End of picture text -----**
- 3) In case 5V of transistor drive circuit, it is recommended to use 4.5V type relay, and 3V to use 2.4V type relay.
- 4) For monostable relays，if you need to drop down voltage and hold mode after reliably operating,make sure that the effective value of holding voltage is not less than 60% of the rated voltage.
- 5) Maximum voltage refers to the maximum voltage which relay coil could endure in a short period of time.
- 6) When user's requirements can't be found in the above table, special order allowed.
- 7) During the relay pick-up or drop-out processes, there are stages of contact pressure change, contact vibration and unstable contact etc. When the voltage applied to coil is gradually changed, it will lengthen the unstable stage and affect relay endurance. To reduce this influence, please apply step voltage(switching circuit) to relay coil.
## **ORDERING INFORMATION**
**==> picture [455 x 244] intentionally omitted <==**
**----- Start of picture text -----**
HFD3 / 24 -2H -L2 S R (XXX)
Type
1.5, 2.4, 3, 4.5, 5, 6,
Coil voltage
9, 12, 24, 48VDC [1)]
Contact arrangement 2H: 2 Form A Nil: 2 Form C
L1: 1 coil latching Nil: Single side stable
Sort
L2: 2 coils latching(Only for 2 Form C)
Terminal type S: Standard SMT S1: Short terminal SMT Nil: THT [2)]
R: Tape and reel packing (Only for SMT type) [3)]
Packing style Nil: Tube packing(Only for THT type)
XXX: Customer special requirement Nil: Standard
825: For light load applications: testing, medical, communications, etc.
Special code [4)]
888: For use in 105 ℃ high-temperature environments.
924: For fire protection applications.
**----- End of picture text -----**
**Notes:** 1) 48VDC coil voltage is only for single side stable version.
- 2) THT relays: Use wave or manual soldering. Confirm reflow soldering feasibility with us first.
- 3) R type (tape and reel) packing is moisture-proof which meets requirement of MSL-3. Please choose R type packing for SMT products. For R type, the letter "R" will only be printed on packing tag but not on relay cover. Tube packing is normally not available for SMT products unless specially requested by customer. But please note that tube packing is not moisture-proof so please bake the products before use according to description of Notice 11 herewith. In addition, tube packaging will be adopted when the ordering quantity of R type is equal to or less than 100 pieces unless otherwise specified.
- 4) The customer special requirement express as special code after evaluating by Hongfa. e.g.(131): The Dielectric strength between coil & contacts is 3000VAC 1min for single side stable and 1 coil latching version.
- 5) When coil sort, terminal type or packing style are needed, pleaes add "-" after coil voltage is selected. For instance, HFD3/12-SR.
- 6) The standard tube length is 624mm,Any special requirement needed, please contact us for more details.
- 7) For products that should meet the explosion-proof requirements of "IEC 60079 series",please note [Ex] after the specification while placing orders.Not all products have explosion-proof certification,so please contact us if necessary, in order to select the suitable products.
- 8) Please make sure that there are no silicon-based substances (such as silicon rubber, silicone oil, silicon-based coating agents, silicon fillers, etc.) around the relay, because it will generate silicon-containing volatile gas, which may cause poor contact in case of silicon-containing volatile gas sticking on contact.Flux proofed and dust cover type relays are prohibited in environments with water vapor and harmful gases (P, Cl, H2S, SO2, NO2). Plastic sealed relays shall be used with practical test verification.
25
Unit: mm
## **OUTLINE DIMENSIONS, WIRING DIAGRAM AND PC BOARD LAYOUT**
**==> picture [417 x 642] intentionally omitted <==**
**----- Start of picture text -----**
2H Type
Outline Dimensions PCB Layout
(Bottom view)
THT type 15 7.5 6xØ1 2.54
0.5 5.08 7.62
1.15
1 2.54
15 7.5
S type: Standard SMT
0.5 5.08 7.62
1.15 9.3
15 7.5 1 2.54
S1 type: Short terminal SMT
0.5 5.08 7.62
1.15 7.5
Single side stable 1 coil latching
Wiring Diagram 1 4 5 1 4 5
(Bottom view)
(Please pay attention to the coil
polarity. Please determine the
polarity by the wiring diagram
and pin diagram) 12 9 8 12 9 8
Orientation mark Orientation mark
No energized condition Reset condition
Single side stable & 1 coil latching
1 4 5
Pin Layout
12 9 8
Orientation mark
**----- End of picture text -----**
26
## **OUTLINE DIMENSIONS, WIRING DIAGRAM AND PC BOARD LAYOUT**
Unit: mm
## **2Z Type**
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Outline Dimensions
**----- End of picture text -----**
PCB Layout (Bottom view)
THT type
**==> picture [138 x 9] intentionally omitted <==**
**----- Start of picture text -----**
Single side stable & 1 coil latching
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**==> picture [137 x 9] intentionally omitted <==**
**----- Start of picture text -----**
Single side stable & 1 coil latching
**----- End of picture text -----**
**==> picture [140 x 217] intentionally omitted <==**
**----- Start of picture text -----**
15 7.5
0.5 5.08
1.15
2 coils latching
15 7.5
0.5 5.08
1.15
**----- End of picture text -----**
**==> picture [117 x 64] intentionally omitted <==**
**----- Start of picture text -----**
8xØ1 2.54
**----- End of picture text -----**
**==> picture [60 x 9] intentionally omitted <==**
**----- Start of picture text -----**
2 coils latching
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**==> picture [121 x 65] intentionally omitted <==**
**----- Start of picture text -----**
10xØ1 2.54
**----- End of picture text -----**
**==> picture [266 x 10] intentionally omitted <==**
**----- Start of picture text -----**
S type: Standard SMT Single side stable & 1 coil latching
**----- End of picture text -----**
Single side stable & 1 coil latching
**==> picture [126 x 69] intentionally omitted <==**
**----- Start of picture text -----**
15 7.5
0.5 5.08
1.15 9.3
**----- End of picture text -----**
**==> picture [313 x 212] intentionally omitted <==**
**----- Start of picture text -----**
1 2.54
0.5 5.08
1.15 9.3
2 coils latching 2 coils latching
15 7.5 1 2.54
0.5 5.08
1.15 9.3
**----- End of picture text -----**
27
Unit: mm
## **OUTLINE DIMENSIONS, WIRING DIAGRAM AND PC BOARD LAYOUT**
## **2Z Type**
**==> picture [91 x 9] intentionally omitted <==**
**----- Start of picture text -----**
Outline Dimensions
**----- End of picture text -----**
**==> picture [446 x 572] intentionally omitted <==**
**----- Start of picture text -----**
Outline Dimensions PCB Layout
(Bottom view)
S1 type: Short terminal SMT Single side stable & 1 coil latching Single side stable & 1 coil latching
15 7.5 1 2.54
0.5 5.08
1.15 7.5
2 coils latching 2 coils latching
15 7.5 1 2.54
0.5 5.08
1.15 7.5
Single side stable 1 coil latching 2 coils latching
Wiring Diagram 1 3 4 5 1 3 4 5 1 3 4 5 6
(Bottom view)
(Please pay attention to the coil
polarity. Please determine the
polarity by the wiring diagram and pin diagram) 12 10 9 8 12 10 9 8 12 10 9 8 7
Orientation mark Orientation mark Orientation mark
No energized condition Reset condition Reset condition
Single side stable & 1 coil latching 2 coils latching
1 3 4 5 6
1 3 4 5
Pin Layout
12 10 9 8 7
Orientation mark 12 10 9 8 Orientation mark
**----- End of picture text -----**
Remark: 1) In case of no tolerance shown in outline dimension: outline dimension ≤ 1mm, tolerance should be ±0.2mm; outline dimension ＞ 1mm and ≤ 5mm, tolerance should be ±0.3mm; outline dimension ＞ 5mm, tolerance should be ±0.4mm. 2) The tolerance without indicating for PCB layout is always ±0.1mm.
- 3) The width of the gridding is 2.54mm.
28
Unit: mm
## **TAPE PACKING**
## Direction of Relay Insertion
**==> picture [432 x 129] intentionally omitted <==**
**----- Start of picture text -----**
I
Reel 4:1
Cover tape Orientation mark
Feed direction
Embossed Notes: 1) Packing: 400pcs/reel, 5 reels/carton.
carrier tape 2) MOQ for reel packing is 800pcs.
I
**----- End of picture text -----**
## Direction of Relay Insertion
## Reel Dimensions
**==> picture [283 x 248] intentionally omitted <==**
**----- Start of picture text -----**
adhesive tape
Cover tape Cover tape adhesive tape
Feed direction
during customer usage
at least 5 empty at least 5 empty
relay positions relay positions
13 0.2 29.4 1
2 0.3 24.4 [1.6]
3-R1
21 0.5
**----- End of picture text -----**
## Tape Dimensions (S type: Standard SMT)
**==> picture [411 x 135] intentionally omitted <==**
**----- Start of picture text -----**
A-A B-B
4
1.5
2 0.5 0.05
B 。
3 max
20 。
A A
2min. 3 。 max.
10 0.2
(3.5)
16
B
9.9
**----- End of picture text -----**
29
Unit: mm
## **TAPE PACKING**
Tape Dimensions (S1 type: Short terminal SMT)
**==> picture [432 x 128] intentionally omitted <==**
**----- Start of picture text -----**
A-A B-B
4
e: 2 1.5 B 3 。 max 0.5 0.05
ob 83818 FF Fe 8 G6 20 。 a :
i | |
A A
|. | |.] I . 2min. 3 。 max. [| 2
8.2 0.2 (3.5)
16
Ce : B ; :
9.9
**----- End of picture text -----**
## **CHARACTERISTIC CURVES**
REFLOW WELDING,TEMPERATURE ON PCB BOARD RECOMMENDED WELDING TEMPERATURE
MAXIMUM SWITCHING POWER
## ENDURANCE CURVE
**==> picture [438 x 142] intentionally omitted <==**
**----- Start of picture text -----**
1000V
500 Temperature
( )
E:T AC Resistive Load it § Gee 30VDC
100V 100 Resistive Load
50 max.245 Soldering
30V a a DC Resistive Load a 220 [oo —(Cts—“‘“‘“‘ HH NN
Sy 180 max. 3 /s
10V see aw seritt = 8 10 AREEREN Resistive Load125VAC 150 aee Preheating ae max. 6 /s
—— So Qa Ne
—— fo) ee oS ee = SS
ead ae mail im mail FERESEEEEEEEESS Jo iN
10mV 10uA 100mA 1A 10A 1 0 1 2 3 max. 100 max. 100max. 60 Time(s)
a A Contact Current PCECEPE Eee Contact Current (A) =o max. 280
Test conditions: Resistive load, at 85oC, 1s on 9s off. (Only for SMT type)
**----- End of picture text -----**
## **Notice**
- 1) This relay is highly sensitive polarized relay, if correct polarity is not applied to the coil terminals, the relay does not operate properly.
- 2) To avoid using relays under strong magnetic field which will change the parameters of relays such as pick-up voltage and drop-out voltage.
- 3) Relay is on the “reset” status when being released from stock, with the consideration of shock risen from transit and relay mounting, it should be changed to the “set” status when application(connecting to the power supply). Please reset the relay to “set” or “reset” status on request.
- 4) Energizing coil with rated voltage is basic for normal operation of a relay, please make sure the energized voltage to relay coil have reached the rated voltage. Regarding latching relay, in order to maintain the "set" or "reset" status, impulse width of the rated voltage applied to coil should be more than 5 times of "set" or "reset" time.
- 5) For a monosteady state relay, after the relay is reliably operated, if it needs to be kept under pressure, make sure that the effective value of the voltage is not less than 60 % of the rated voltage;
- 6) For 2 coil latching relay,do not emergize voltage to "set" coil and "reset" coil simultaneously.
- 7) The relay may be damaged because of falling or when shocking conditions exceed the requirement.
- 8) For SMT products, validation with real application should be done before your series production, if the reflow-soldering temperature curve is out of our recommendation. Generally, two-time reflow-soldering is not recommended for the relay. However, if two-time reflow-soldering is required,a 60-min. interval should be guaranteed and a validation should be done before production.
- 9) Please use wave soldering or manual soldering for straight-in relay. If you need reflow welding, please confirm the feasibility with us.
- 10) Contact is recommended for suitable condition and specifications if water cleaning or surface process is involved in assembling relays on PCB.11) Regarding the plastic sealed relay, we should leave it cooling naturally untill below 40remarkably the temperature of solvents should also be controlled below 40oC.Please avoid cleaning the relay by ultrasonic, avoid using thesolventsoC after welding, then clean it and deal with coating, like gasoline, Freon, and so on, which would affect the configuration of relay or influence the environment.
- 12) Relays packaged in moisture barrier bags meet MSL-3 requirements. The relays should be stored at ambient conditions of ≤ 30 ℃ and ≤ 60% RH after they are removed from their packaging, and should be used within 168 hours. If the relays cannot be used within 168 hours, please repack them or store them in a drying oven at 25 ℃± 5 ℃ , ≤ 10% RH. Otherwise, relays may be subjected to a soldering test to check their performance, or they may be used after keeping them in an oven for 72 hours at with 50 ℃± 5 ℃ , ≤ 30% RH.
- 13) When applied with continuous current, the heat from relay coil will age its isolation. Thus, please do not ground connected the coil to reduce electrical errosion if possible. And please provide protection circuit to avoid broken wire and losses.
- 14) Please make sure that there are no silicon-based substances (such as silicon rubber, silicone oil, silicon-based coating agents, silicon fillers, etc.) around the relay, because it will generate silicon-containing volatile gas, which may cause poor contact in case of silicon-containing volatile gas sticking on contact.Flux proofed and dust cover type relays are prohibited in environments with water vapor and harmful gases (P, Cl, H2S, SO2, NO2). Plastic sealed relays shall be used with practical test verification.
- 15) About preferable condition of operation, storage and transportation, please refer to "Explanation to terminology and guidetines of relay".
- 16) During the relay pick-up or drop-out processes, there are stages of contact pressure change, contact vibration and unstable contact etc. When the voltage applied to coil is gradually changed, it will lengthen the unstable stage and affect relay endurance. To reduce this influence, please apply step voltage(switching circuit) to relay coil.
Disclaimer
The specification is for reference only. See to "Terminology and Guidelines" for more information. Specifications subject to change without notice. We could not evaluate all the performance and all the parameters for every possible application. Thus the user should be in a right position to choose the suitable product for their own application. If there is any query, please contact Hongfa for the technical service. However, it is the user’s responsibility to determine which product should be used only.
© Xiamen Hongfa Electroacoustic Co., Ltd. All rights of Hongfa are reserved.
30
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- [Supplier page](https://es.farnell.com/hongfa/hfd3-12/signal-relay-12v-4a-th/dp/4733556)
---
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