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STMicroelectronics ESDA37WY
- Part No.:
- ESDA37WY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
ESDA37WY.pdf
- Description:
- TVS DIODE 36VWM SOT323-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,269
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Product details
Overview
ESDA37WY from STMicroelectronics is an automotive-grade unidirectional dual-line transient voltage suppressor (TVS) designed for ESD and EOS protection on low-speed DC lines. It delivers 30 kV air-discharge ESD immunity (ISO 10605, C = 150 pF/R = 330 Ω), 300 W peak pulse power (8/20 µs), 36 V reverse stand-off voltage, <100 nA leakage at VRM, and clamps to 50.5 V at 16 A TLP. It protects MCU I/O, MOSFET gates, and switch/button interfaces in under-hood automotive modules.
For engineers reviewing the ESDA37WY datasheet, ESDA37WY pinout, ESDA37WY application, or ESDA37WY equivalent, key selection criteria include its 36 V stand-off rating, dual-cathode SOT323-3L configuration, 4.8 pF line-to-ground capacitance, -55 °C to +175 °C junction temperature range, and compliance with ISO 7637-3 Pulse 2a/3a/3b surge waveforms.
Technical Context
The ESDA37WY implements a silicon avalanche diode structure optimized for fast turn-on (<1 ns) and stable clamping under repetitive ESD stress. Its dual-cathode topology isolates two protected lines sharing a common anode (Pin 3), enabling independent protection of two signals without cross-talk.
It operates as a voltage-triggered crowbar device: breakdown initiates at ≥37 V (typ.), clamping within nanoseconds to ≤50.5 V at 16 A, with dynamic resistance of 2.4 Ω. Temperature coefficient αT = 3.5 × 10⁻⁴/°C ensures predictable VBR drift across its full -55 °C to +175 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Stand-off Voltage (VRM) | 36 V - Maximum continuous DC voltage the device blocks without leakage exceeding 100 nA; sets upper limit for protected line operating voltage. |
| Peak Pulse Power (PPP) | 300 W (8/20 µs) - Sustains transient surges up to 300 W without failure; supports ISO 7637-3 Pulse 2a/3a/3b robustness. |
| ESD Withstand Level | ±30 kV air discharge (ISO 10605, C = 150 pF/R = 330 Ω) - Meets AEC-Q101 stress requirements for harsh automotive environments. |
| Clamping Voltage (VCL) | 50.5 V at 16 A TLP - Limits voltage seen by downstream IC during ESD event; ensures safe margin below 5.5 V or 12 V logic rail damage thresholds. |
| Line Capacitance (CI/O–GND) | 4.8 pF - Minimal signal distortion on low-speed buses (I²C, SPI, buttons); avoids timing skew or rise-time degradation. |
| Junction Temperature Range | -55 °C to +175 °C - Enables placement near heat sources (ECU power stages, motor drivers) without derating. |
| Package | SOT323-3L (SC-70) - 2.1 mm × 2.0 mm footprint; compatible with IPC-7531 and JEDEC MO-203AA standards. |
Pinout & Package
SOT323-3L package: 3-pin surface-mount, lead-free, RoHS-compliant (ECOPACK2), UL94 V0 rated epoxy, MSL Level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | I/O1 Cathode | Protected signal line 1 - connects to first sensitive node (e.g., MCU GPIO); cathode polarity enables unidirectional clamping to GND. |
| 2 | I/O2 Cathode | Protected signal line 2 - independent second channel; allows dual-line protection (e.g., push-button pair, dual sensor inputs) in single footprint. |
| 3 | Common Anode (GND) | Shared return path - ties both cathodes to system ground; eliminates need for separate GND traces and reduces PCB routing complexity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified & PPAP capable | Validated for automotive production use with full traceability, process control, and reliability testing per JESD47. |
| Dual-line unidirectional protection | Two independent ESD paths share one GND pin - saves board space vs. discrete diodes and avoids inter-channel coupling. |
| Low 4.8 pF capacitance | Preserves signal integrity on 100 kHz–1 MHz buses (I²C, LIN, analog sensors); no added RC delay or ringing. |
| 175 °C max junction temperature | Enables mounting directly on engine-control PCBs or near power MOSFETs without thermal derating or heatsinking. |
| ISO 7637-3 compliant | Withstands ±150 V Pulse 3a/3b and ±85 V Pulse 2a transients - meets OEM requirements for battery-line and load-dump immunity. |
Applications
| MCU GPIO Protection | MOSFET Gate Protection |
|---|---|
|
Use Scenario: Protecting 3.3 V or 5 V microcontroller input pins (e.g., reset, interrupt, wake-up lines) in body control modules. IC Role / Device Role / Timing Role: Unidirectional crowbar clamp that diverts ESD current to GND before voltage exceeds MCU absolute maximum rating. Use Value: Prevents latch-up and permanent gate oxide damage during assembly handling or field operation, maintaining functional safety integrity. |
Use Scenario: Shielding N-channel MOSFET gate terminals from ESD during hot-plug events in power distribution units. IC Role / Device Role / Timing Role: Fast-turn-on TVS limiting gate-source voltage to ≤50.5 V during 15 kV contact discharge. Use Value: Eliminates need for series gate resistors or Zener clamps, preserving switching speed while ensuring gate oxide reliability. |
| Automotive Switch/Button Interface | I²C/SPI Bus Line Protection |
|
Use Scenario: Safeguarding mechanical switch inputs (door lock, seat position, HVAC controls) exposed to human touch in cabin environments. IC Role / Device Role / Timing Role: Dual-cathode configuration protects both switch sides (open/closed state) with shared GND return. Use Value: Maintains low-leakage (<100 nA) in standby mode while delivering 30 kV air-discharge immunity - critical for battery-powered modules. |
Use Scenario: Adding ESD resilience to bidirectional I²C clock/data lines or SPI MOSI/MISO in infotainment head units. IC Role / Device Role / Timing Role: Low-capacitance (4.8 pF) dual-channel clamp prevents signal edge degradation and bus lockup. Use Value: Enables robust communication over 20 cm traces without compromising rise time or noise margin - validated per ISO 10605. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-line unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESDA18WY | Lower VRM (16 V), lower clamping (21.7 V @ 16 A), higher capacitance (4.8 pF same), lower PPP (290 W) | Better suited for 12 V logic rails; insufficient for 24 V or high-side switch protection | Select when protecting 3.3 V/5 V/12 V I/O with tighter clamping budget and lower surge energy requirements. |
| ESDA14WY | VRM = 12 V, VCL = 17.5 V @ 16 A, PPP = 250 W, same SOT323-3L package | Optimized for low-voltage MCU peripherals; cannot withstand 24 V supply transients or high-energy pulses | Prefer for cost-sensitive body electronics where 12 V system voltage and moderate ESD levels dominate. |
Compared with ESDA14WY and ESDA18WY, ESDA37WY provides higher stand-off and clamping margins essential for 24 V automotive systems, gate protection of high-side switches, and environments with elevated surge exposure - making it the only choice among the three for under-hood powertrain and chassis modules.
Availability
ESDA37WY is available at Aetrix Electronics and suitable for automotive body control modules, power distribution units, and engine management systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ESDA37WY 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 management solutions with vertical manufacturing and broad IP portfolio.
The ESDAxxWY series belongs to ST's automotive transient protection product line, engineered specifically to replace MOVs and Zeners in AEC-Q101-compliant systems where reliability, low capacitance, and high-temperature operation are mandatory.
FAQ
What is the maximum continuous reverse voltage ESDA37WY can block without significant leakage?
The ESDA37WY has a reverse stand-off voltage (VRM) of 36 V, meaning it reliably blocks up to 36 V DC across each I/O-to-GND path while maintaining reverse leakage below 100 nA. This rating defines the highest steady-state voltage on protected lines before the device begins conducting significantly - critical for compatibility with 24 V automotive supply domains and high-side switch biasing.
How does ESDA37WY differ from standard unidirectional TVS diodes in layout and routing?
ESDA37WY uses a dual-cathode, single-anode configuration (Pins 1 & 2 = cathodes, Pin 3 = common GND), allowing two independent signal lines to share one ground connection. This eliminates separate GND vias and reduces loop area versus two discrete diodes - lowering inductive overshoot during ESD events and simplifying PCB routing in space-constrained ECUs.
Can ESDA37WY be used on bidirectional data lines like I²C without signal distortion?
Yes - with only 4.8 pF line-to-ground capacitance and no series resistance, ESDA37WY introduces negligible loading on I²C lines operating up to 400 kHz. Its unidirectional architecture clamps positive transients to GND while leaving negative excursions unaffected; for full bidirectional protection, a second device or complementary design is required - but for typical automotive I²C (where pull-ups dominate), this configuration suffices.
Is ESDA37WY suitable for reflow soldering on lead-free PCBs?
Yes - ESDA37WY is qualified for lead-free reflow per J-STD-020 MSL Level 1 and features an ECOPACK2 RoHS-compliant SOT323-3L package. Its recommended reflow profile peaks at 240–245 °C for 60–90 seconds, fully compatible with standard Pb-free SAC305 processes and stencil thicknesses of 75–125 µm.
ESDA37WY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- SC-70, SOT-323
- Series:
- *
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36V
- Voltage - Breakdown (Min):
- 37V
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- 6.3A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323-3
ESDA37WY FAQ
1.How can I place an order for ESDA37WY through Aetrix?
Please submit a Request for Quotation (RFQ) for ESDA37WY 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 ESDA37WY reliable?
The price and inventory of ESDA37WY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ESDA37WY is usually 5 days.
3.What payment methods are accepted for ESDA37WY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ESDA37WY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ESDA37WY?
ESDA37WY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ESDA37WY 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 ESDA37WY?
For technical support, including ESDA37WY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ESDA37WY requirements.
6.How does Aetrix verify that ESDA37WY is sourced from the original manufacturer or authorized distributors?
All ESDA37WY 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 ESDA37WY meets industry standards.
7.What is the process for return or replacement of ESDA37WY?
All ESDA37WY units undergo pre-shipment inspection (PSI). If there is an issue with ESDA37WY, 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 ESDA37WY part is unused and in its original packaging.
Return procedure for ESDA37WY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ESDA37WY Tags
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