# Fuse, Surface Mount, 1.6 A, Fast Acting, 350 V, 250 V, 4818 [1245 Metric], 1245UMFF Series

![Product image](https://novapart.co/image/farnell:3974257/)

**URL**: https://novapart.co/products/TR-1245UMFF1-6-R/fuse-surface-mount-16-a-fast-acting-350-v-250-4818
**SKU**: TR-1245UMFF1-6-R
**Manufacturer**: EATON BUSSMANN
**Category**: Circuit Protection || Fuses & Fuse Accessories || Fuses || SMD Fuses
**Price**: €0.5450
**Stock**: 500+
**Lead Time**: 99 days (indicative)

## Specifications

| Parameter | Value |
|---|---|
| Svhc | To Be Advised |
| Fuse Current | 1.6A |
| Product Range | 1245UMFF Series |
| Fuse Case Style | 4818 [1245 Metric] |
| Voltage Rating Vac | 350V |
| Voltage Rating Vdc | 250V |
| Blow Characteristic | Fast Acting |
| Breaking Capacity Current Ac | 100A |
| Breaking Capacity Current Dc | 100A |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:3974257/)

Technical Data **ELX1120** Effective March 2022 

## 1245UMFF Universal modular fuse, fast acting, SMT 

## **Applications** 

- Power supply 

- White goods 

- Lighting system 

- Industrial equipment 

- Lighting ballast 

- AC/DC adaptor primary protection 

- Medical Equipment 

- Battery protection 

## **Product features** 

- 12.5 x 4.8 x 4.8 mm surface mount package 

- Complies with IEC60127-4 Universal modular fuse-links 

- Fast acting 

- 350 Vac/250 Vdc Voltage rating brick fuse 

- LCD monitor 

- Office electronic equipment 

- Industrial equipment 

## **Agency information** 

Universal modular fuse: UL file number: E526626 

- Ceramic square body with end cap design 

- Moisture sensitivity level (MSL): 1 

## **Environmental compliance** 

**==> picture [22 x 22] intentionally omitted <==**

**----- Start of picture text -----**<br>
HALOGEN<br>HF<br>FREE<br>**----- End of picture text -----**<br>


## **Ordering part number** 

*The ordering code is the packaging code and part number replacing the “.” with a “-” i.e. 1.25=1-25 

## **TR - 1245UMF  F x-xx - R** 

**==> picture [54 x 53] intentionally omitted <==**

**----- Start of picture text -----**<br>
Packaging code<br>Family name<br>Fast acting option<br>Rated current<br>RoHS<br>**----- End of picture text -----**<br>


## **Packaging prefix** 

TR- (1000 parts on a 13” diameter tape and reel) 

1245UMFF Universal modular fuse, fast acting, SMT 

Technical Data ELX1120 Effective March 2022 

## **Electrical characteristics** 

|||**1.25 In**||**2 In**|||
|---|---|---|---|---|---|---|
|**Amp Rating**||**minimum**||**maximum**||**10 In**|
|500 mA ~ 6.3 A||1 hour||120 seconds||1 - 10 milliseconds|



## **Product specifications** 

||**Current**|**Voltage**|**Voltage**|**Interrupting rating**|**Interrupting rating**|**Typical cold**|**Maximum**||
|---|---|---|---|---|---|---|---|---|
||**rating**|**rating**|**rating**|**@ rated voltage1**|**@ rated voltage**|**resistance2**|**voltage drop**||
|**Part number**|**(A)**|**(Vac)**|**(Vdc)**|**(A) Vac**|**(A) Vdc**|**(mΩ)**|**(mV)**|**Part marking**|
|1245UMFF500-R|0.5|350|250|200 A @ 250 Vac<br>100 A @ 350 Vac|100|300|600|BUSS F500 mA<br>L 250 V|
|1245UMFF630-R|0.63|350|250|200 A @ 250 Vac<br>100 A @ 350 Vac|100|160|500|BUSS F630 mA<br>L 250 V|
|1245UMFF800-R|0.8|350|250|200 A @ 250 Vac<br>100 A @ 350 Vac|100|110|400|BUSS F800 mA<br>L 250 V|
|1245UMFF1-R|1|350|250|200 A @ 250 Vac<br>100 A @ 350 Vac|100|95|300|BUSS F1A<br>L 250 V|
|1245UMFF1-25-R|1.25|350|250|200 A @ 250 Vac<br>100 A @ 350 Vac|100|70|300|BUSS F1.25 A<br>L 250 V|
|1245UMFF1-6-R|1.6|350|250|200 A @ 250 Vac<br>100 A @ 350 Vac|100|58|300|BUSS F1.6 A<br>L 250 V|
|1245UMFF2-R|2|350|250|200 A @ 250 Vac<br>100 A @ 350 Vac|100|40|300|BUSS F2A<br>L 250 V|
|1245UMFF2-5-R|2.5|350|250|200 A @ 250 Vac<br>100 A @ 350 Vac|100|40|300|BUSS F2.5 A<br>L 250 V|
|1245UMFF3-15-R|3.15|350|250|200 A @ 250 Vac<br>100 A @ 350 Vac|100|30|300|BUSS F3.15 A<br>L 250 V|
|1245UMFF4-R|4|350|250|200 A @ 250 Vac<br>100 A @ 350 Vac|100|19|300|BUSS F4A<br>L 250 V|
|1245UMFF5-R|5|350|250|200 A @ 250 Vac<br>100 A @ 350 Vac|100|16|300|BUSS F5A<br>L 250 V|
|1245UMFF6-3-R|6.3|350|250|200 A @ 250 Vac<br>100 A @ 350 Vac|100|13|300|BUSS F6.3 A<br>L 250 V|



1. AC Interrupting rating (measured at designated voltage, >95% power factor and 30 ° closing angle) 

2. Typical cold resistance is measured at <10% of rated current in ambient temperature of +25 °C 

**Dimensions- mm** Drawing not to scale 

## **Recommended pad layout** 

|**Rating**|**L**||**W**||**H**|
|---|---|---|---|---|---|
|0.5 A to 6.3 A|12 maximum||2.7 ± 0.30||4.5 ± 0.30|



2 

www.eaton.com/electronics 

Technical Data ELX1120 Effective March 2022 

## 1245UMFF Universal modular fuse, fast acting, SMT 

## **General specifications** 

Operating temperature: -40 °C to +125 °C with proper derating factor applied Thermal shock:  MIL-STD-202 Method 107, -40 °C/+125 °C, 1000 cycles, Maximum transfer time 20 seconds, Dwell time 15 minutes. Air-Air Humidity bias:  MIL-STD-202 Method 103, 1000 hours +85 °C/85%RH. Solderability: J-STD-002, Method B1 Steam aging 1 hour, Solder temperature +255 ± 5 °C, solder immersion time 5 s Mechanical shock:  MIL-STD-202 Method 213,  Figure 1 of Method 213. Condition C 100 g 6 ms High temperature operating life:  MIL-STD-202 Method 108,  Condition D steady state TA=+70 °C at 60% rated current. Vibration:  MIL-STD-202F Method 201,  2 hours each of 3 orientations. Test from 10-55 Hz in 1 Min. Soldering heat resistance:  MIL-STD-202 Method 210,  Solder temperature +260 ±5 °C, solder immersion time 10 ±5 s 

## **Packaging information - mm** 

1000 parts per 13” diameter reel (EIA-481 compliant) Drawing not to scale 

**==> picture [182 x 158] intentionally omitted <==**

**----- Start of picture text -----**<br>
|||||
|---|---|---|---|
|Dimension|millimeter|
|||
|W|24.00|
|7|
|F|11.50|
|E1|1.75|
|a|
|P0|4.00|
|1|7)|P1|8.00|
|SS|
|J|—|
|P2|2.00|
|ØD0|1.50|
|A0|4.90|
|B0|12.70|
|a|
|K0|4.50|
|A-A|
|T|0.40|

**----- End of picture text -----**<br>


## **Reel dimension- mm** 

**==> picture [80 x 75] intentionally omitted <==**

**----- Start of picture text -----**<br>
|||
|---|---|
|Dimension|millimeter|
|A|330 ± 1.0|
|B|2.1 ± 0.5|
|SSS|
|C|13.5 ± 0.5|
|W1|25 ± 0.3|
|W2|30.4 Max|

**----- End of picture text -----**<br>


3 

www.eaton.com/electronics 

1245UMFF Universal modular fuse, fast acting, SMT 

Technical Data ELX1120 Effective March 2022 

## **Temperature derating curve** 

**==> picture [216 x 142] intentionally omitted <==**

**----- Start of picture text -----**<br>
08<br>0.6<br>0.4<br>0.2<br>0<br>-60 -40  -20 0 20 40 60<br>Temperature (°C)<br>Derating factor<br>**----- End of picture text -----**<br>


**Current vs. time curve** 

**==> picture [8 x 59] intentionally omitted <==**

**----- Start of picture text -----**<br>
Time (seconds)<br>**----- End of picture text -----**<br>


**==> picture [42 x 8] intentionally omitted <==**

**----- Start of picture text -----**<br>
Current (A)<br>**----- End of picture text -----**<br>


4 

www.eaton.com/electronics 

Technical Data ELX1120 Effective March 2022 

1245UMFF Universal modular fuse, fast acting, SMT 

## **I[2] T vs. time curve** 

**==> picture [149 x 194] intentionally omitted <==**

**----- Start of picture text -----**<br>
100 4<br>1 KY<br>01<br>0.01<br>0.001 o1 10<br>Time (seconds)<br>s)t (A22I<br>**----- End of picture text -----**<br>


## **I[2] T vs. current curve** 

**==> picture [121 x 194] intentionally omitted <==**

**----- Start of picture text -----**<br>
100<br>1<br>01<br>0.01<br>O1 1<br>Current (A)<br>s)t (A22I<br>**----- End of picture text -----**<br>


5 

www.eaton.com/electronics 

1245UMFF Universal modular fuse, fast acting, SMT 

Technical Data ELX1120 Effective March 2022 

## **Wave solder profile** 

|**Temperature**<br>Tsmin<br>Tsmax<br>Tstyp<br>Tp<br>**Reference EN 61760-1:2006**<br>**Profile feature**|tp<br>First Wave<br>Second Wave<br>Preheat area<br>Cool down area|tp<br>First Wave<br>Second Wave<br>Preheat area<br>Cool down area|
|---|---|---|
||**Time**||
|Preheat                    • Temperature min.|(Tsmin)|100 °C<br>100 °C|
|• Temperature typ. (Tstyp)||120 °C<br>120 °C|
|• Temperature max. (Tsmax)||130 °C<br>130 °C|
|• Time (Tsmin to Tsmax) (ts)||70 seconds<br>70 seconds|
|D preheat tomax Temperature||150 °C max.<br>150 °C max.|
|Peak temperature (TP)*||235 °C – 260 °C<br>250 °C – 260 °C|
|Time at peak temperature (tp)||10 seconds max<br>5 seconds max each wave<br>10 seconds max<br>5 seconds max each wave|
|Ramp-down rate||~ 2 K/s min<br>~3.5 K/s typ<br>~5 K/s max<br>~ 2 K/s min<br>~3.5 K/s typ<br>~5 K/s max|
|Time 25 °C to 25 °C||4 minutes<br>4 minutes|



## **Manual solder** 

+350 °C (4-5 seconds by soldering iron), generally manual/hand soldering is not recommended. 

6 

www.eaton.com/electronics 

1245UMFF Universal modular fuse, fast acting, SMT 

Technical Data ELX1120 Effective March 2022 

## **Solder reflow profile** 

**==> picture [328 x 182] intentionally omitted <==**

**----- Start of picture text -----**<br>
TP<br>TC -5°C<br>Max. Ramp Up Rate = 3°C/s tP<br>Max. Ramp Down Rate = 6°C/s<br>TL<br>Preheat t |<br>"= A<br>Tsmax<br>Tsmin<br>   ts<br>25°C<br>Time 25°C to Peak  Time<br>Temperature<br>**----- End of picture text -----**<br>


## **Table 1 - Standard SnPb solder (Tc)** 

|**Package**<br>**thickness**||**Volume**<br>**mm3**<br>**<350**||**Volume**<br>**mm3**<br>**≥350**|
|---|---|---|---|---|
|<2.5 mm<br>≥2.5 mm||235 °C<br>220 °C||220 °C<br>220 °C|



## **Table 2 - Lead (Pb) free solder (Tc)** 

|**Package**<br>**thickness**||**Volume**<br>**mm3**<br>**<350**||**Volume**<br>**mm3**<br>**350 - 2000**||**Volume**<br>**mm3**<br>**>2000**|
|---|---|---|---|---|---|---|
|<1.6 mm||260 °C||260 °C||260 °C|
|1.6 – 2.5 mm||260 °C||250 °C||245 °C|
|>2.5 mm||250 °C||245 °C||245 °C|



## **Reference J-STD-020** 

|**Profile feature**||**Standard SnPb solder**||**Lead (Pb) free solder**|
|---|---|---|---|---|
|Preheat and soak     • Temperature min. (Tsmin)||100 °C||150 °C|
|• Temperature max. (Tsmax)||150 °C||200 °C|
|• Time (Tsmin to Tsmax) (ts)||60-120 seconds||60-120 seconds|
|Ramp up rate TL to Tp||3 °C/ second max.||3 °C/ second max.|
|Liquidous temperature (Tl)||183 °C||217 °C|
|Time (tL) maintained above TL||60-150 seconds||60-150 seconds|
|Peak package body temperature (TP)*||Table 1||Table 2|
|Time (tp)* within 5 °C of the specified classification temperature (Tc)||20 seconds*||30 seconds*|
|Ramp-down rate (Tpto TL)||6 °C/ second max.||6 °C/ second max.|
|Time 25 °C to peak temperature||6 minutes max.||8 minutes max.|



* Tolerance for peak profile temperature (Tp) is defined as a supplier minimum and a user maximum. 

Life Support Policy: Eaton does not authorize the use of any of its products for use in life support devices or systems without the express written approval of an officer of the Company. Life support systems are devices which support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 

Eaton reserves the right, without notice, to change design or construction of any products and to discontinue or limit distribution of any products. Eaton also reserves the right to change or update, without notice, any technical information contained in this bulletin. 

**Eaton Electronics Division** 1000 Eaton Boulevard Cleveland, OH 44122 United States Eaton.com/electronics © 2022 Eaton All Rights Reserved Printed in USA Publication No. ELX1120 BU-ELX21128 March 2022 

Follow us on social media to get the Eaton is a registered trademark. latest product and support information. All other trademarks are property of their respective owners. f/¥jinjo 



## Links

- [View this product on Novapart](https://novapart.co/products/TR-1245UMFF1-6-R/fuse-surface-mount-16-a-fast-acting-350-v-250-4818)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/bussmann-by-eaton/tr-1245umff1-6-r/smd-fuse-fast-acting-1-6a-350vac/dp/3974257)
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