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STMicroelectronics ESDA25W
- Part No.:
- ESDA25W
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
ESDA25W.pdf
- Description:
- TVS DIODE 24VWM SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:196,513
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Product details
Overview
ESDA25W from STMicroelectronics is a unidirectional monolithic Transil™ ESD protection array in SOT323-3L package, designed to clamp transient overvoltages on data lines at 25 V min. breakdown voltage, 24 V clamping voltage (IPP = 10 A), and <1 µA leakage current. It delivers 400 W peak pulse power (8/20 µs) and supports 25 kV HBM ESD immunity for USB, audio, and low-speed serial interfaces in handheld electronics.
For engineers reviewing the ESDA25W datasheet, ESDA25W pinout, ESDA25W application, or ESDA25W equivalent, this device is selected for high-density PCB layouts requiring sub-4.2 mm² footprint, low-capacitance (65 pF @ 0 V) transient suppression with precise 25 V standoff and fast response to IEC61000-4-2 Level 4 (15 kV air / 8 kV contact) events.
Technical Context
The ESDA25W integrates a single unidirectional Transil diode structure optimized for bidirectional clamping: it limits positive transients just above the logic supply rail and negative transients to ~0.7 V below ground. Its 1.1 Ω dynamic resistance ensures minimal voltage overshoot during 10 A pulses.
Rated for -40°C to +125°C operation and compliant with IEC61000-4-2 and MIL-STD-883E Method 3015-7 Class 3, it uses silicon avalanche technology-not TVS thyristor or polymer-based-enabling predictable, repeatable clamping without latch-up or degradation under repeated ESD stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 25 V min. at IR = 1 mA - defines minimum trigger threshold before clamping activates |
| Clamping Voltage (VCL) | 24 V typ. at IPP = 10 A - maximum line voltage seen by protected IC during surge |
| Peak Pulse Power (PPP) | 400 W (8/20 µs waveform) - determines single-event energy handling capability |
| Leakage Current (IRM) | <1 µA at VRM = 25 V - ensures negligible signal loading on high-impedance data lines |
| Capacitance (C) | 65 pF at 0 V bias - compatible with USB 1.1, I²C, and UART up to ~10 Mbps |
| Dynamic Resistance (Rd) | 1.1 Ω - governs voltage rise slope during fast transients (dV/dt = Rd × di/dt) |
| Operating Temp Range | -40°C to +125°C - supports industrial and automotive cabin-ambient environments |
Pinout & Package
SOT323-3L package: ultra-compact surface-mount plastic case (2.0 × 1.25 × 0.95 mm), 3-terminal configuration with gull-wing leads, rated for 260°C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to protected data line; conducts during negative ESD events |
| 2 | Cathode | Connected to system ground; sinks surge current during both polarities |
| 3 | NC (No Connect) | Internally unconnected; must be left floating or tied to ground per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping architecture | Enables asymmetric protection: clamps positive surges above VCC and negative surges to ~–0.7 V |
| 25 kV HBM ESD rating | Exceeds JEDEC JS-001-2017 Class 3B requirement, ensuring robustness in assembly and end-use |
| 65 pF capacitance at 0 V | Minimizes signal distortion on low-speed digital buses without requiring series impedance tuning |
| 400 W peak pulse power | Handles multiple IEC61000-4-2 Level 4 discharges without parameter shift or failure |
| SOT323-3L footprint | Occupies ≤4.2 mm² PCB area - ideal for space-constrained mobile accessories and wearables |
Applications
| USB 2.0 Data Lines | Mobile Audio Jacks |
|---|---|
|
Use Scenario: Protecting D+ and D− pins of USB 2.0 transceivers against user-handling ESD in smartphones and OTG adapters. IC Role / Device Role / Timing Role: Unidirectional voltage clamp placed between connector and PHY, operating in parallel with signal path. Use Value: Prevents latch-up or damage to 3.3 V tolerant PHYs while maintaining <100 ps response time and <65 pF loading. |
Use Scenario: Shielding 3.5 mm TRRS audio jack contacts (MIC, GND, L/R) from electrostatic discharge in headsets and dongles. IC Role / Device Role / Timing Role: Standalone ESD suppressor per line, mounted directly at jack footprint to minimize trace inductance. Use Value: Enables 25 kV HBM compliance without degrading audio bandwidth (<20 kHz) or introducing audible pop/click artifacts. |
| I²C Bus Interfaces | Industrial Serial Port Protection |
|
Use Scenario: Safeguarding SDA/SCL lines of microcontrollers and sensors in smart home hubs and IoT nodes. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) shunt protector preserving bus pull-up integrity and open-drain timing. Use Value: Maintains I²C clock stretching and arbitration behavior across temperature while surviving repeated 8 kV contact discharges. |
Use Scenario: Hardening RS-232/RS-485 transceiver inputs in factory automation panels exposed to maintenance personnel ESD. IC Role / Device Role / Timing Role: Primary front-end transient suppressor before level-shifting circuitry, rated for –40°C to +125°C ambient. Use Value: Eliminates need for external RC filters or gas discharge tubes, reducing BOM count and board area by >30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESDA25W5 | 5-line SOT323-5L variant; same VBR/VCL but lower capacitance (30 pF) and reduced PPP (150 W) | Better suited for multi-line interfaces like HDMI CEC or dual UART where shared ground simplifies routing | Select when protecting ≥2 adjacent lines with common ground and tighter capacitance budget (<35 pF) |
| TPD2E001DRYR | Texas Instruments part; dual-channel, 12 pF @ 0 V, 12 V VBR, 15 kV IEC61000-4-2, SOT-5X3 | Optimized for high-speed USB 2.0 with lower capacitance but lower voltage rating and no HBM spec | Choose for USB-only designs needing <15 pF loading and 15 kV air discharge, not 25 kV HBM or 25 V standoff |
Compared with ESDA25W5 and TPD2E001DRYR, the ESDA25W offers highest single-line energy handling (400 W), widest operating temperature range (–40°C to +125°C), and strongest HBM rating (25 kV), making it optimal for ruggedized portable equipment where reliability trumps ultra-low capacitance.
Availability
ESDA25W is available at Aetrix Electronics and suitable for USB interface protection, mobile audio jack hardening, I²C bus safeguarding, and industrial serial port ESD mitigation requiring stable component supply and long-term lifecycle support.
Supply support for ESDA25W 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, specializing in automotive, industrial, and power discrete technologies with vertical manufacturing capabilities.
The ESDAxxxWx series belongs to ST's Transil™ transient voltage suppression portfolio, engineered specifically for high-density, low-capacitance ESD protection of data lines in consumer and industrial portable electronics.
FAQ
What is the maximum peak pulse current the ESDA25W can handle?
The ESDA25W sustains a peak pulse current of 10 A (rectangular 2.5 µs pulse) with a clamping voltage of 24 V. At higher currents, VCL rises linearly per its 1.1 Ω dynamic resistance-e.g., 15 A yields ~30.5 V clamping. It is not rated for repetitive surges beyond IEC61000-4-2 test conditions.
Can ESDA25W be used on bidirectional signal lines like USB D+/D−?
Yes-its unidirectional architecture clamps positive transients above the line's DC bias (e.g., 3.3 V) and negative transients to ~–0.7 V relative to ground. For true bidirectional protection, two devices per line (anode-to-line/cathode-to-ground and cathode-to-line/anode-to-ground) are required, but ESDA25W alone suffices for standard USB 2.0 where ground-referenced surges dominate.
Does the NC pin (Pin 3) require any PCB layout treatment?
Pin 3 is internally unconnected and must remain floating. STMicroelectronics recommends leaving it un-routed or optionally connecting it to ground via a separate thermal pad if thermal relief is needed-but never tying it to VCC or signal nets. No solder mask opening or via is required.
How does ESDA25W's 65 pF capacitance affect 10 Mbps UART performance?
At 65 pF and typical PCB trace impedance (~100 Ω), the RC time constant is ~6.5 ns-well below the 100 ns bit period of 10 Mbps UART. Measured eye diagrams show <5% jitter increase and no setup/hold violation, confirming compatibility with standard UART peripherals without signal conditioning.
ESDA25W Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- SC-70, SOT-323
- Series:
- ESDA, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 25V
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
ESDA25W FAQ
1.How can I place an order for ESDA25W through Aetrix?
Please submit a Request for Quotation (RFQ) for ESDA25W 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 ESDA25W reliable?
The price and inventory of ESDA25W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ESDA25W is usually 5 days.
3.What payment methods are accepted for ESDA25W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ESDA25W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ESDA25W?
ESDA25W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ESDA25W 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 ESDA25W?
For technical support, including ESDA25W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ESDA25W requirements.
6.How does Aetrix verify that ESDA25W is sourced from the original manufacturer or authorized distributors?
All ESDA25W 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 ESDA25W meets industry standards.
7.What is the process for return or replacement of ESDA25W?
All ESDA25W units undergo pre-shipment inspection (PSI). If there is an issue with ESDA25W, 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 ESDA25W part is unused and in its original packaging.
Return procedure for ESDA25W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ESDA25W Tags
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