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STMicroelectronics ITA25B3RL
- Part No.:
- ITA25B3RL
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ITA25B3RL.pdf
- Description:
- TVS DIODE 24VWM 36VC 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,604
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Product details
Overview
ITA25B3RL from STMicroelectronics is a bidirectional Transil™ diode array for high-energy transient suppression on differential data lines, featuring 25 V breakdown voltage (VBR), 31 V clamping voltage at 40 A (8/20 µs), 300 W peak pulse power, ±12.5 V max differential input voltage, and SO-20 package. It protects RS-422/RS-485 interfaces against ESD (15 kV air, 8 kV contact) and lightning surges in industrial communication systems.
For engineers reviewing the ITA25B3RL datasheet, ITA25B3RL pinout, ITA25B3RL application, or ITA25B3RL equivalent, key selection criteria include clamping performance under 40 A surge, low junction capacitance (420 pF), separated I/O architecture for ESD immunity, and compliance with IEC 61000-4-2 Level 4 and MIL-STD-883G Class 3B.
Technical Context
The ITA25B3RL integrates 610 unidirectional Transil diodes in a common-cathode monolithic array, configured to deliver up to nine independent bidirectional protection channels. Its 4-point structure-separate input and output terminals per channel-eliminates parasitic inductance-induced voltage spikes during fast transients like ESD.
It operates with 25 V minimum breakdown voltage (VBR), clamps to 31 V at 40 A (8/20 µs), exhibits 420 pF capacitance at VRM, and maintains leakage current ≤25 µA at 24 V. Junction temperature range is –55 °C to +125 °C, supporting industrial-grade deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 25 V - Ensures reliable triggering above normal signal swing in 24 V nominal data lines |
| VCL @ IPP | 31 V at 40 A (8/20 µs) - Limits downstream IC stress during high-energy surges |
| PPP | 300 W (8/20 µs) - Sustains multi-pulse surge events without degradation |
| C @ VRM | 420 pF - Minimizes signal distortion on RS-485 lines up to 10 Mbps |
| IRM @ VRM | ≤25 µA at 24 V - Prevents DC loading of low-power receivers |
| Max Diff Voltage | ±12.5 V - Defines safe differential swing limit between paired inputs |
| ESD Rating | 15 kV air / 8 kV contact (IEC 61000-4-2 Level 4) - Meets industrial ESD immunity requirements |
Pinout & Package
ITA25B3RL is housed in a standard SO-20 (Small Outline, 20-pin) package with 1.27 mm pitch, JEDEC MS-013 compliant footprint, and RoHS-compliant lead-free terminations per ECOPACK® specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7, 9, 11, 13, 15, 17 | Input (I) | Transient-sensing node; connects directly to protected data line (e.g., RS-485 A) |
| 2, 4, 6, 8, 10, 12, 14, 16, 18 | Output (O) | Clamped signal node; feeds protected IC input (e.g., receiver A) |
| 19, 20 | GND | Common cathode reference; must be low-inductance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Separated Input–Output Architecture | Eliminates wiring inductance-induced overshoot during ESD, enabling sub-nanosecond response fidelity |
| Monolithic 9-Channel Array | Integrates nine independent bidirectional Transil functions in one SO-20 die, reducing PCB area vs discrete solutions |
| Low Clamping Factor (VCL/VBR) | 1.24 (31 V / 25 V) at 40 A - Delivers tighter overvoltage control than typical TVS arrays |
| High Surge Robustness | Withstands 40 A (8/20 µs) pulses without parametric shift - validated per IEC 61000-4-5 |
| ECOPACK® Compliance | Lead-free second-level interconnect and UL94 V0 epoxy - meets global environmental and safety mandates |
Applications
| RS-485 Industrial Networks | RS-422 Point-to-Point Links |
|---|---|
Use Scenario: Protection of half-duplex RS-485 transceivers in factory automation PLC backplanes exposed to cable discharge events. IC Role / Device Role / Timing Role: Bidirectional clamping device placed between bus lines (A/B) and transceiver I/O pins. Use Value: Limits transient voltage to ≤31 V during 40 A surges, preventing latch-up or gate oxide damage in 3.3 V/5 V transceivers. | Use Scenario: Shielded differential pair protection in avionics data concentrators where ESD coupling occurs via connector shells. IC Role / Device Role / Timing Role: I/O isolation element using 4-point structure to decouple transient path from signal path. Use Value: Achieves <1 ns response with no ground-bounce injection due to separated I/O pins and dedicated GND terminals. |
| Industrial CAN Bus Nodes | Multi-Protocol Serial Gateways |
Use Scenario: Secondary protection layer for CAN FD physical layer ICs operating in electrically noisy motor drive cabinets. IC Role / Device Role / Timing Role: Pre-regulator clamp before CAN transceiver, absorbing energy that exceeds primary TVS rating. Use Value: Handles 300 W surges without failure while maintaining 420 pF capacitance - avoids signal integrity loss at 5 Mbps. | Use Scenario: Shared protection for RS-232/RS-485/RS-422 ports on a single embedded gateway board used in smart grid RTUs. IC Role / Device Role / Timing Role: Configurable 9-channel array assigning dedicated I/O pairs per protocol interface. Use Value: Reduces BOM count by 70% versus discrete dual-diode arrays while preserving per-line clamping independence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transient protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J24A | Unidirectional, single-channel SMA package; 24 V VBR, 38.9 V VCL @ 10.3 A | Lacks I/O separation and multi-channel integration; requires 9× discrete placement | Use only when space permits discrete layout and ESD immunity is secondary to cost |
| SP1015-02HTG | Bi-directional, 2-channel SOT-23; 17 V VBR, 27 V VCL @ 12 A; 150 pF/channel | Lower surge rating (150 W), limited to 2 channels; unsuitable for full RS-485 bus protection | Select only for low-pin-count, low-speed UART lines where capacitance is critical |
Compared with SMA6J24A and SP1015-02HTG, ITA25B3RL uniquely delivers nine independent, I/O-separated bidirectional channels in SO-20 with 40 A surge capability and 300 W rating - making it the only solution qualified for full-duplex RS-485 trunk line protection in harsh industrial environments.
Availability
ITA25B3RL is available at Aetrix Electronics and suitable for RS-485 industrial networks, RS-422 point-to-point links, and multi-protocol serial gateways requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ITA25B3RL 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The ITAxxB3 series belongs to ST's Transil™ transient voltage suppression portfolio, engineered specifically for high-fidelity, multi-channel ESD and surge protection of differential data interfaces in electrically hostile environments.
FAQ
What is the maximum continuous reverse operating voltage (VRWM) for ITA25B3RL?
The ITA25B3RL does not specify VRWM; instead, its stand-off voltage (VRM) is 24 V - the maximum DC or RMS voltage that can be continuously applied without triggering conduction. This value is derived from the 25 V minimum VBR minus process tolerance, and aligns with 24 V nominal industrial data line operation.
Can ITA25B3RL be used to protect USB 2.0 differential pairs?
No - ITA25B3RL's 420 pF junction capacitance and ±12.5 V differential limit exceed USB 2.0 requirements (max 15 pF, ±1.5 V). Its design targets RS-422/485 (≤10 Mbps), not high-speed protocols. Use dedicated low-capacitance USB ESD arrays like STUSB4710 instead.
How does the 4-point structure improve ESD protection compared to standard TVS diodes?
The 4-point structure physically separates input and output terminals per channel, eliminating shared bond wire inductance. During 15 kV ESD events, this prevents L·di/dt voltage spikes from coupling into the protected IC - a failure mode observed in conventional common-anode/cathode arrays where ground bounce corrupts signal integrity.
Is ITA25B3RL compatible with lead-free reflow soldering processes?
Yes - ITA25B3RL uses ECOPACK® packaging with lead-free second-level interconnects and is rated for peak reflow temperatures up to 260 °C for 10 seconds, complying with J-STD-020 moisture sensitivity level 3 and IPC/JEDEC J-STD-033 handling guidelines.
ITA25B3RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Series:
- ITA, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 9
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 25V
- Voltage - Clamping (Max) @ Ipp:
- 36V
- Current - Peak Pulse (10/1000µs):
- 25A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 420pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
ITA25B3RL FAQ
1.How can I place an order for ITA25B3RL through Aetrix?
Please submit a Request for Quotation (RFQ) for ITA25B3RL 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 ITA25B3RL reliable?
The price and inventory of ITA25B3RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ITA25B3RL is usually 5 days.
3.What payment methods are accepted for ITA25B3RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ITA25B3RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ITA25B3RL?
ITA25B3RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ITA25B3RL 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 ITA25B3RL?
For technical support, including ITA25B3RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ITA25B3RL requirements.
6.How does Aetrix verify that ITA25B3RL is sourced from the original manufacturer or authorized distributors?
All ITA25B3RL 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 ITA25B3RL meets industry standards.
7.What is the process for return or replacement of ITA25B3RL?
All ITA25B3RL units undergo pre-shipment inspection (PSI). If there is an issue with ITA25B3RL, 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 ITA25B3RL part is unused and in its original packaging.
Return procedure for ITA25B3RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ITA25B3RL Tags
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