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STMicroelectronics ITA10B1
- Part No.:
- ITA10B1
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ITA10B1.pdf
- Description:
- TVS DIODE 8VWM 19VC 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,971
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Product details
Overview
ITA10B1 from STMicroelectronics is a bidirectional Transil™ diode array in SO-8 package, designed for differential data line protection with 10 V standoff voltage (VRM), 15 V clamping voltage at 10 A (VCL @ IPP), 40 A peak pulse current (8/20 µs), and 570 pF junction capacitance - deployed in RS-422/RS-485 transceiver interfaces to suppress ESD and surge transients.
For engineers reviewing the ITA10B1 datasheet, ITA10B1 pinout, ITA10B1 application, or ITA10B1 equivalent, key selection criteria include bidirectional clamping performance, ±5.0 V max differential voltage between I/O pins, low leakage (<4 µA @ VRM), compliance with IEC 61000-4-2 Level 4 (15 kV air), and SO-8 thermal and layout compatibility.
Technical Context
This monolithic array integrates six unidirectional Transil diodes with a common cathode, configured to deliver up to five independent bidirectional protection channels between I/O pins and GND. Each channel provides symmetrical clamping in both polarities with a defined maximum differential voltage of ±5.0 V at 25 °C.
It operates within a junction temperature range of –55 °C to +125 °C and sustains 300 W peak pulse power (8/20 µs) without degradation. Clamping voltage rises predictably with current (e.g., 19 V at 25 A), enabling precise overvoltage margining in high-speed serial links.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 10 V - Maximum continuous reverse voltage before conduction begins; sets operating margin above signal swing in RS-422 lines. |
| Breakdown Voltage (VBR) | 10–12 V @ 1 mA - Confirmed avalanche onset; ensures reliable triggering during fast transients. |
| Clamping Voltage (VCL) | 15 V @ 10 A (8/20 µs) - Actual voltage seen by protected IC during surge; limits stress on downstream receivers. |
| Peak Pulse Current (IPP) | 40 A (8/20 µs) - Surge handling capacity per channel; supports IEC 61000-4-5 line surge immunity testing. |
| Junction Capacitance (C) | 570 pF @ VRM, 1 MHz - Measured between I/O and GND; impacts signal integrity on >1 Mbps RS-485 buses. |
| Leakage Current (IRM) | <4 µA @ 10 V - Minimal DC loading on bias networks; preserves common-mode range in differential receivers. |
| ESD Rating | ±15 kV air / ±8 kV contact (IEC 61000-4-2 Level 4) - Validated human-body and system-level ESD robustness. |
Pinout & Package
ITA10B1 is housed in a standard SO-8 surface-mount package (JEDEC MS-012AC), with 1.27 mm pitch, lead-free terminations compliant with ECOPACK® and UL94 V0 epoxy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7 | I/O1–I/O4 | Four bidirectional data line terminals; each pairs internally with GND via Transil junctions for symmetrical clamping. |
| 2, 4, 6, 8 | GND | Dual GND pins (pins 2 & 4, 6 & 8) - Provide low-inductance return paths and thermal dissipation for surge energy. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping per channel | Enables single-device protection of full-duplex differential pairs (e.g., RS-422 TX+/TX–) without polarity constraints. |
| Low clamping factor (VCL/VBR) | 1.5× at 10 A - Minimizes overvoltage overshoot relative to breakdown, reducing risk of latch-up in 3.3 V/5 V receivers. |
| High surge capability | 300 W (8/20 µs) - Sustains multiple transient events without parameter shift, supporting industrial fieldbus longevity. |
| Controlled differential voltage limit | ±5.0 V max between any two I/O pins - Prevents cross-talk-induced breakdown in multi-channel layouts. |
| Low leakage & capacitance | <4 µA IRM and 570 pF - Preserves signal rise time and DC bias stability in 20 Mbps RS-485 links. |
Applications
| RS-422 Line Protection | RS-485 Transceiver Interface |
|---|---|
Use Scenario: Protecting balanced differential drivers/receivers in point-to-point industrial control links operating up to 10 Mbps. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed directly at connector entry, clamping ESD and lightning-induced surges before reaching MAX3080-level transceivers. Use Value: Maintains signal fidelity under 15 kV ESD strikes while limiting clamped voltage to ≤15 V - within absolute maximum rating of 3.3 V or 5 V RS-422 ICs. | Use Scenario: Shielding half/full-duplex RS-485 nodes in factory automation networks exposed to ground potential differences and motor switching noise. IC Role / Device Role / Timing Role: Four-channel I/O protector tied to A/B/Y/Z bus lines and local GND, absorbing common-mode surges and differential transients simultaneously. Use Value: Enables robust operation at 250 kbps over 1200 m cable runs by suppressing >40 A surges without degrading edge rate (capacitance <600 pF). |
| RS-232 Port Hardening | Industrial CAN Bus Node Protection |
Use Scenario: Reinforcing legacy RS-232 ports on PLC HMI panels subjected to frequent operator ESD events in dusty environments. IC Role / Device Role / Timing Role: Dual-channel bidirectional clamp on TX/RX lines referenced to local GND, replacing discrete TVS diodes with tighter VBR matching and lower parasitic inductance. Use Value: Eliminates false framing errors caused by 8 kV contact discharge by clamping to 15 V within <1 ns - faster than discrete Zener-based solutions. | Use Scenario: Adding secondary surge protection to CANH/CANL lines in automotive body control modules where primary protection resides upstream. IC Role / Device Role / Timing Role: Two-channel bidirectional suppressor applied across CANH–GND and CANL–GND, leveraging ±5.0 V differential limit to avoid CAN bus lock-up during transients. Use Value: Prevents bus-off states during ISO 16750-2 pulse 5a/b tests by limiting clamping voltage to 19 V at 25 A - below TJA1055 transceiver damage threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional data-line protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J10A | Unidirectional, single-diode SMA package; 10 V VBR, 17.5 V VCL @ 10 A; no integrated multi-channel layout. | Requires four discrete devices + external routing; lacks differential voltage coordination between pins. | Select when board space allows discrete placement and only unidirectional protection is needed. |
| SP1015-01UTG | Single-channel bidirectional TVS in SOD-323; 10.5 V VBR, 18 V VCL @ 1 A; rated for 300 W but lower IPP (20 A). | Limited to one I/O pair; not suitable for simultaneous multi-line protection in SO-8 footprint. | Choose for cost-sensitive, low-pin-count designs where 1 A ESD-only duty suffices. |
Compared with SMA6J10A and SP1015-01UTG, ITA10B1 uniquely delivers four coordinated bidirectional channels in one SO-8 package with guaranteed ±5.0 V inter-pin differential limit - essential for maintaining signal integrity in multi-wire differential buses without cross-coupling failure.
Availability
ITA10B1 is available at Aetrix Electronics and suitable for RS-422 interface hardening, RS-485 node protection, and industrial RS-232 port reinforcement requiring stable component supply and long-term manufacturing continuity.
Supply support for ITA10B1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The ITAxxB1 series belongs to ST's Transil™ transient voltage suppression portfolio, engineered specifically for high-reliability differential data line protection in harsh electromagnetic environments.
FAQ
What is the maximum differential voltage allowed between two I/O pins on ITA10B1?
The maximum differential voltage between any two I/O pins (e.g., I/O1 and I/O2) is ±5.0 V at 25 °C, as specified in Table 3 of the datasheet. Exceeding this risks internal junction breakdown due to the monolithic structure's shared cathode architecture - critical for layout spacing in multi-channel differential systems.
Does ITA10B1 meet automotive-grade reliability requirements?
No - ITA10B1 is not qualified to AEC-Q101 or automotive temperature grades. Its operating junction temperature range is –55 °C to +125 °C, but ST explicitly states non-automotive use unless designated "automotive grade." It is intended for industrial, telecom, and commercial equipment where extended temperature operation is needed without automotive qualification.
Can ITA10B1 be used to protect USB 2.0 data lines?
No - its 570 pF junction capacitance exceeds USB 2.0 specification limits (<10 pF typical), which would severely attenuate 480 Mbps signals and violate eye diagram compliance. ITA10B1 is optimized for lower-speed differential protocols like RS-422/RS-485 (≤25 Mbps) where capacitance tolerance is higher.
How does the SO-8 package affect thermal performance during surge events?
The SO-8 package uses dual GND pins (pins 2/4 and 6/8) to reduce thermal resistance and distribute surge energy across two parallel paths. With a maximum junction temperature of 125 °C and 300 W pulse rating, it achieves sufficient heat dissipation for repetitive 8/20 µs transients - provided PCB copper area meets ST's recommended SO-8 thermal pad layout (≥100 mm² per GND pad).
ITA10B1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- ITA, TRANSIL™
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 5
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 19V
- Current - Peak Pulse (10/1000µs):
- 25A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 570pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ITA10B1 FAQ
1.How can I place an order for ITA10B1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ITA10B1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ITA10B1 reliable?
The price and inventory of ITA10B1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ITA10B1 is usually 5 days.
3.What payment methods are accepted for ITA10B1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ITA10B1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ITA10B1?
ITA10B1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ITA10B1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ITA10B1?
For technical support, including ITA10B1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ITA10B1 requirements.
6.How does Aetrix verify that ITA10B1 is sourced from the original manufacturer or authorized distributors?
All ITA10B1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ITA10B1 meets industry standards.
7.What is the process for return or replacement of ITA10B1?
All ITA10B1 units undergo pre-shipment inspection (PSI). If there is an issue with ITA10B1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ITA10B1 part is unused and in its original packaging.
Return procedure for ITA10B1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ITA10B1 Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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