# TVS Diode, Transil, Bidirectional, 15 V, 28 V, SOIC, 8 Pins
**URL**: https://novapart.co/products/ITA18B1RL/tvs-diode-transil-bidirectional-15-v-28-soic-8
**SKU**: ITA18B1RL
**Manufacturer**: STMICROELECTRONICS
**Category**: Circuit Protection || TVS - Transient Voltage Suppressors || TVS Diodes
**Price**: €0.5990
**Stock**: 1000+
**Lead Time**: 120 days (indicative)
## Description
Product Range:Transil Series; TVS Polarity:Bidirectional; Reverse Stand-Off Voltage Vrwm:15V; Clamping Voltage Vc Max:28V; Diode Case Style:SOIC; No. of Pins:8Pins; Breakdown Voltage Min:18V
## Specifications
| Parameter | Value |
|---|---|
| Svhc | No SVHC (25-Jun-2025) |
| No. Of Pins | 8Pins |
| Tvs Polarity | Bidirectional |
| Product Range | Transil |
| Qualification | - |
| Diode Mounting | Surface Mount |
| Diode Case Style | SOIC |
| Clamping Voltage Max | 28V |
| Reverse Standoff Voltage | 15V |
| Maximum Breakdown Voltage | - |
| Minimum Breakdown Voltage | 18V |
| Operating Temperature Max | 125°C |
| Peak Pulse Power Dissipation | 300W |
## Datasheet
📄 [Download PDF](https://novapart.co/datasheet/farnell:3129632/)
**ITAxxB1**
Bidirectional Transil™ array for data line protection
**==> picture [61 x 39] intentionally omitted <==**
## **Features**
- High surge capability Transil array: IPP = 40 A (8/20 µs)
- Peak pulse power: 300 W (8/20 µs)
- Up to 5 bidirectional Transil functions
- Low clamping factor (VCL / VBR) at high current level
- Low leakage current
- ESD protection up to 15 kV
## **Complies with the following standards**
- IEC 61000-4-2 level 4
- 15 kV (air discharge)
- 8 kV (contact discharge)
- MIL STD 883G- Method 3015-7: class 3B – 25 kV (human body model)
**==> picture [150 x 78] intentionally omitted <==**
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SO-8
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## **Figure 1. Functional diagram**
**==> picture [146 x 92] intentionally omitted <==**
**----- Start of picture text -----**
I/O1 1 8 GND
I/O2 2 7
I/O3 3 6
I/O4 4 5 GND
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## **Applications**
Differential data transmission line protection, such as:
- RS-232
- RS-423
- RS-422
- RS-485
## **Description**
Transil diode arrays provide high overvoltage protection by clamping action. Their instantaneous response to transient overvoltages makes them particularly suited to protect voltage sensitive devices such as MOS technology and low voltage supplied IC’s.
The ITA series combines high surge capability against energetic pulses with high voltage performance against ESD.
TM: Transil is a trademark of STMicroelectronics
1/7
November 2007
Rev 2
_www.st.com_
**Characteristics**
**ITAxxB1**
## **1 Characteristics**
## **Table 1. Absolute ratings (Tamb = 25 °C)**
|**Table 1.**|**Absolute ratings (Tamb = 25 °C)**|**Absolute ratings (Tamb = 25 °C)**|||
|---|---|---|---|---|
|**Symbol**|**Parameter**||**Value**|**Unit**|
|PPP|Peak pulse power (8/20 µs)(1)|Tjinitial = Tamb|300|W|
|IPP|Peak pulse current (8/20 µs)(1)|Tjinitial = Tamb|40|A|
|I2t|Wire I2t value(1)||0.6|A2s|
|Tj|Maximum operating junction temperature||125|°C|
|Tstg|Storage temperature range||-55 to +150|°C|
|TL|Maximum lead temperature for soldering during 10 s at 5 mm for case||260|°C|
1. For surges greater than the specified maximum value, the I/O will first present a short-circuit and after an open circuit caused by the wire melting.
## **Table 2. Electrical characteristics (Tamb = 25 °C)**
|**Symbol**|**Parameter**|**Parameter**|**Parameter**|**Parameter**|**Parameter**|||**VBR**
**VCL**
**VRM**
**IRM**
**IPP**
**I**
**V**|**VBR**
**VCL**
**VRM**
**IRM**
**IPP**
**I**
**V**|**VBR**
**VCL**
**VRM**
**IRM**
**IPP**
**I**
**V**|**VBR**
**VCL**
**VRM**
**IRM**
**IPP**
**I**
**V**|**VBR**
**VCL**
**VRM**
**IRM**
**IPP**
**I**
**V**|**VBR**
**VCL**
**VRM**
**IRM**
**IPP**
**I**
**V**|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|VRM|Stand-off voltage|||||||||||||
|VBR|Breakdown voltage|||||||||||||
|VCL|Clamping voltage|||||||||||||
|IRM|Leakage current|||||||||||||
|IPP|Peak pulse current|||||||||||||
|αT|Voltage temperature coefficient|||||||||||||
|C|Capacitance|||||||||||||
|**Order code**||**VBR**
**@ IR**
min.
(1)||**IRM @ VRM**
max.|||**VCL**
(1)|**@ IPP**
8/20 µs||**VCL @ IPP**
max.
8/20 µs
(1)||α**T**
max.|**C**
max.
(2)|
|||V|mA|µA|V||V||A|V|A|10-4/ °C|pF|
|ITA6V5B1||6.5|1|10|5||10||10|12|25|4|750|
|ITA10B1||10|1|4|8||15||10|19|25|8|570|
|ITA18B1||18|1|4|15||25||10|28|25|9|350|
|ITA25B1||25|1|4|24||33||10|38|25|12|300|
1. Betwenn I/O pin and ground.
2. Between two input pins at 0 V Bias, F = 1 MHz.
2/7
**Characteristics**
**ITAxxB1**
## **Figure 2. Pulse waveform**
## **Figure 3. Typical peak pulse power versus exponential pulse duration**
**==> picture [463 x 160] intentionally omitted <==**
**----- Start of picture text -----**
PPP(W)
%IPP 1E+04 T j initial=25°C
100 8 µs ITA25B1 ITA18B1
1E+03
Pulse waveform 8/20 µs
50 ITA6V5B1 ITA10B1
1E+02
0 t
20 µs 1E+01 tP(ms) expo
1E-03 1E-02 1E-01 1E+00 1E+01 1E+02
**----- End of picture text -----**
## **Figure 4. Clamping voltage versus peak pulse current (exponential waveform 8/20 µs)**
**Figure 5. Peak current IDC inducing open circuit of the wire for one input/output versus pulse duration (typical values)**
**==> picture [463 x 368] intentionally omitted <==**
**----- Start of picture text -----**
VCL(V) IDC(A)
1E+03 1E+03
Tj initial=25°C %IPP Exponential waveform
100
50
1E+02 0 tr tp t 1E+02
ITA25B1
ITA18B1
1E+01 1E+01
ITA6V5B1 ITA10B1
1E+00 IPP(A) 1E+00 tP(ms)
1E-01 1E+00 1E+01 1E+02 1E-02 1E-01 1E+00 1E+01
Figure 6. Junction capacitance versus Figure 7. Relative variation of leakage
reverse applied voltage for one current versus junction
input/output (typical values) temperature
C(pF)
1E+03 IR(T j)
IR(T =25°C)j
ITA6V5B1 TF=1MHzj=25°C 5E+3
VR=VRM
1E+3
ITA10B1 1E+2
1E+1
ITA18B1
1E+0
ITA25B1 Tj(°C)
1E+02 VR(V) 1E-1
0 25 50 75 100 125 150
1E+00 1E+01 1E+02
**----- End of picture text -----**
3/7
**Application information**
**ITAxxB1**
## **2 Application information**
This monolithic Transil Array is based on 6 unidirectional Transils with a common cathode and can be configurated to offer up to 5 bidirectional functions. This imposes a maximum differential voltage between 2 input pins (see _Table 3_ ).
**Table 3. Maximum differential voltages**
|**Order code**|**Maximum differential voltage between two input pins at 25 °C**|
|---|---|
|ITA6V5B1|± 3.5 V|
|ITA10B1|± 5.0 V|
|ITA18B1|± 9.0 V|
|ITA25B1|± 12.5 V|
## **Figure 8. RS-232 junction (typical application)**
**==> picture [237 x 136] intentionally omitted <==**
**----- Start of picture text -----**
TX
RX
RTS
CTS
GND
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## **3 Ordering information scheme**
**==> picture [197 x 10] intentionally omitted <==**
**----- Start of picture text -----**
Figure 9. Ordering information scheme
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**==> picture [233 x 139] intentionally omitted <==**
**----- Start of picture text -----**
ITA 25 B 1 RL
Integrated Transil Array
Breakdown Voltage (min)
25 = 25 Volt
Type of lines protected
B = Bidirectional
Package
1 = SO-8
Packaging
RL = Tape & reel
Blank = Tube
**----- End of picture text -----**
4/7
**Package information**
**ITAxxB1**
## **4 Package information**
## ● Epoxy meets UL94, V0
In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
## **Table 4. SO-8 dimensions**
|**b**
**ccc C**
**k**
**C**
**(Seating**
**Plane)**
C||||||||**E1**
**E**
**A**
**A2**
**A1**
**°**
**L**
**1**
**0.25mm**
**(Gage Plane)**|**E1**
**E**
**A**
**A2**
**A1**
**°**
**L**
**1**
**0.25mm**
**(Gage Plane)**|**Ref.**|**Dimensions**|**Dimensions**|**Dimensions**|**Dimensions**|**Dimensions**|**Dimensions**|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
||||||||||||**Millimeters**|||**Inches**|||
||**cc**|**C**|||||||||||||||
|||||||||**A2**|**A**||||||||
||||||||||||**Min.**|**Typ.**|**Max.**|**Min.**|**Typ.**|**Max.**|
|||**b**||||**e**
**h x 45**||||A|||1.75|||0.069|
|||||||||||A1|0.1||0.25|0.004||0.010|
|||||||||||A2|1.25|||0.049|||
||||||||||||||||||
|||||||||||b|0.28||0.48|0.011||0.019|
||||||||||||||||||
||**k**|||||**D**
**L**||||C|0.17||0.23|0.007||0.009|
|||||||||||D|4.80|4.90|5.00|0.189|0.193|0.197|
|||||||||||E|5.80|6.00|6.20|0.228|0.236|0.244|
|||||||||||E1|3.80|3.90|4.00|0.150|0.154|0.157|
||||||||||||||||||
|||||||||||e||1.27|||0.050||
|||||||||**E1**|||||||||
||||**8**||||**5**|**E1**||h|0.25||0.50|0.010||0.020|
|||||||||||L|0.40||1.27|0.016||0.050|
||||||||||||||||||
|||||||||||L1||1.04|||0.041||
||||~~**1**~~||||~~**4**~~|||k°|0||8|0||8|
||||||||||||||||||
|||||||||||ccc|||0.10|||0.004|
## **Figure 10. SO-8 footprint (dimensions in mm)**
**==> picture [132 x 124] intentionally omitted <==**
**----- Start of picture text -----**
6.7
0.54
4.03
1.27
1.335
**----- End of picture text -----**
5/7
**Ordering Information**
**ITAxxB1**
## **5 Ordering Information**
## **Table 5. Ordering information**
|**Table 5.**
**Ordering **|**information**|||||
|---|---|---|---|---|---|
|**Order code**|**Marking**|**Package**|**Weight**|**Base qty**|**Delivery mode**|
|ITA6V5B1|6V5B1|SO-8|0.08 g|2000|Ammopack|
|ITA6V5B1RL|6V5B1|||2500|Tape and reel|
|ITA10B1|10B1|||2000|Ammopack|
|ITA18B1|18B1|||2000|Ammopack|
|ITA18B1RL|18B1|||2500|Tape and reel|
|ITA25B1|25B1|||2000|Ammopack|
|ITA25B1RL|25B1|||2500|Tape and reel|
## **6 Revision history**
## **Table 6. Document revision history**
|**Date**|**Revision**|**Description of changes**|
|---|---|---|
|13-Dec-2004|1|First issue.|
|15-Nov-2007|2|Reformatted to current standards.
SO-8 package dimensions update.
Updated pulse waveform parameters in_Figure 2_.|
6/7
**ITAxxB1**
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7/7
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