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STMicroelectronics SM50T13AY
- Part No.:
- SM50T13AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM50T13AY.pdf
- Description:
- AUTOMOTIVE 5000 W, 11 V TVS IN S
- Quantity:
- Payment:
- Shipping:
Inventory:2,292
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Product details
Overview
SM50T13AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMC package, designed to clamp transient overvoltages up to 18 V (VCL @ 10/1000 µs) with 5000 W peak pulse power, 13 V breakdown voltage (VBR min), and 0.2 µA leakage at 25 °C - deployed for ISO 7637-2 Pulse 1/2a/3a/3b protection in 12 V battery-based engine control units.
For engineers reviewing the SM50T13AY datasheet, SM50T13AY pinout, SM50T13AY application, or SM50T13AY equivalent, this device serves as a high-reliability surge suppressor for automotive power line protection where junction temperature stability up to +175 °C, low dynamic resistance (7.57 mΩ), and ESD robustness per IEC 61000-4-2 (±30 kV contact/air) are critical selection criteria.
Technical Context
The SM50T13AY uses planar silicon technology to achieve stable VBR drift coefficient (αT = 10 × 10−4/°C) and low leakage across −55 °C to +175 °C operating junction range. Its unidirectional configuration enables asymmetric clamping with forward conduction during negative transients.
It meets ISO 7637-2 requirements for automotive load dump immunity (Pulse 1: −150 V; Pulse 2a: +112 V; Pulse 3a: −220 V; Pulse 3b: +150 V) and supports compliance with ISO 16750-2 Test B (load dump, Us = 87 V, td = 150/400 ms) when mounted on recommended IPC7531-compliant footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 11 V - ensures reliable turn-on before downstream circuit damage under slow-rising transients |
| VCL @ 10/1000 µs | 18 V - clamps 5000 W surges while limiting voltage stress on protected ICs |
| IPP @ 10/1000 µs | 275 A - delivers high-current surge handling without thermal runaway |
| RD | 7.57 mΩ - minimizes clamping voltage rise under fast, high-amplitude pulses |
| IR @ VRM | 0.2 µA at 25 °C - prevents standby current leakage in always-on automotive modules |
| Tj max | +175 °C - supports under-hood placement near engines or power electronics |
| ESD rating | ±30 kV contact/air (IEC 61000-4-2) - exceeds automotive ESD immunity requirements |
Pinout & Package
SM50T13AY is housed in JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads, compatible with standard reflow profiles (peak 240–245 °C). The package features two terminals: cathode (marked with bar) and anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (bar-marked) | Transient voltage reference node | Connected to protected line; conducts during positive overvoltage events |
| Anode | Return path to ground or battery negative | Completes clamping path; must be routed with low-inductance trace to minimize VCL overshoot |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability across temperature cycling, humidity, and mechanical shock |
| Planar silicon construction | Enables stable VBR drift and low leakage at Tj = +175 °C for long-term under-hood operation |
| Low dynamic resistance (7.57 mΩ) | Reduces clamping voltage rise during fast 8/20 µs surges (e.g., ISO 7637-2 Pulse 3b) |
| UL94 V0 flammability rating | Ensures PCB-level fire safety compliance in enclosed automotive enclosures |
| JEDEC MSL Level 1 | Allows unlimited floor life before reflow, eliminating bake requirements for production assembly |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Line |
|---|---|
|
Use Scenario: Protects 12 V supply rail of engine ECU against load dump (ISO 7637-2 Pulse 5b) and alternator-induced transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps 150 V transients to ≤18 V within 1 ns, preventing latch-up or burnout of upstream PMICs. |
Use Scenario: Shields CAN transceiver power pins from coupled surges during vehicle jump-start or battery reversal events. IC Role / Device Role / Timing Role: Secondary protection device parallel to primary LC filter on VCC line of CAN FD transceiver. Use Value: Maintains <1 µA leakage at 13.5 V nominal, avoiding false wake-up in low-power sleep modes. |
| Advanced Driver Assistance System (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
|
Use Scenario: Safeguards image sensor module power input against ignition noise and ISO 7637-2 Pulse 3a (−220 V) induced by solenoid switching. IC Role / Device Role / Timing Role: First-line transient suppressor on 5 V/3.3 V LDO input rail feeding CMOS image sensor and ISP. Use Value: Withstands 175 °C junction temperature, enabling direct mounting near heat-generating lens actuators. |
Use Scenario: Protects H-bridge gate driver IC supply against inductive kickback from brushed DC motor commutation. IC Role / Device Role / Timing Role: Bidirectional clamping (via companion SM50T13CAY) across motor supply rails to absorb ±112 V Pulse 2a transients. Use Value: Delivers 24.2 A peak pulse current at 15.6 V clamping voltage, preserving MOSFET gate oxide integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ13A | VBR min = 14.4 V; VCL = 21.2 V @ 10/1000 µs; 400 W PPP; SMA package | Limited to non-critical 12 V circuits due to lower surge rating and no AEC-Q101 qualification | Select only for cost-sensitive non-safety systems where 5000 W clamping is not required |
| TPSMA6L13A | VBR min = 14.4 V; VCL = 21.2 V @ 10/1000 µs; 600 W PPP; AEC-Q101 qualified but SOD-123FL | Insufficient for ISO 7637-2 Pulse 1 (−150 V); unsuitable for high-energy load dump scenarios | Use only for low-energy signal-line protection where board space constraints prohibit SMC |
Compared with SMAJ13A and TPSMA6L13A, SM50T13AY provides 12.5× higher peak pulse power, 10× lower dynamic resistance, and full ISO 7637-2 Pulse 1–3b compliance - making it the sole choice for front-end power rail protection in ASIL-B/C automotive ECUs.
Availability
SM50T13AY is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera systems, and electric power steering controllers requiring stable component supply across extended automotive temperature ranges and multi-year production cycles.
Supply support for SM50T13AY 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, delivering intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.
The SM50TxxAY series belongs to ST's automotive-grade transient voltage suppression portfolio, engineered specifically for robust ISO 7637-2 and ISO 10605 compliance in harsh under-hood environments.
FAQ
What is the maximum clamping voltage of SM50T13AY under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SM50T13AY is 18 V when subjected to a 10/1000 µs waveform at 275 A peak pulse current, measured at Tj = 25 °C. This value increases linearly with junction temperature at αT = 10 × 10−4/°C, reaching ~19.3 V at Tj = 125 °C.
Is SM50T13AY suitable for bidirectional transient protection?
No - SM50T13AY is a unidirectional TVS diode, intended for protection of positive-polarity lines referenced to ground. For bidirectional protection (e.g., data lines or floating supplies), ST offers the companion part SM50T13CAY, which features symmetrical clamping in both polarities and identical electrical ratings except for polarity marking.
How does SM50T13AY meet ISO 16750-2 load dump requirements?
SM50T13AY satisfies ISO 16750-2 Test B (load dump) by clamping 87 V transients with 150 ms or 400 ms duration to ≤18 V while sustaining >275 A peak current. Its 5000 W rating and low RD ensure voltage overshoot remains below 20 V even with PCB trace inductance up to 50 nH.
What is the recommended PCB footprint for SM50T13AY?
The recommended footprint follows IPC7531 guidelines and JEDEC MO-213AA outline: pad length 5.11 mm, pad width 1.54 mm, center-to-center spacing 8.19 mm, and copper area ≥3.14 cm² per lead. This layout achieves Rth(j-a) ≤ 45 °C/W and supports full 5000 W surge dissipation without thermal derating.
SM50T13AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 11V (Max)
- Voltage - Breakdown (Min):
- 12.3V
- Voltage - Clamping (Max) @ Ipp:
- 18V
- Current - Peak Pulse (10/1000µs):
- 275A
- Power - Peak Pulse:
- 5000W (5kW)
- 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:
- SMC
SM50T13AY FAQ
1.How can I place an order for SM50T13AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM50T13AY 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 SM50T13AY reliable?
The price and inventory of SM50T13AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM50T13AY is usually 5 days.
3.What payment methods are accepted for SM50T13AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM50T13AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM50T13AY?
SM50T13AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM50T13AY 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 SM50T13AY?
For technical support, including SM50T13AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM50T13AY requirements.
6.How does Aetrix verify that SM50T13AY is sourced from the original manufacturer or authorized distributors?
All SM50T13AY 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 SM50T13AY meets industry standards.
7.What is the process for return or replacement of SM50T13AY?
All SM50T13AY units undergo pre-shipment inspection (PSI). If there is an issue with SM50T13AY, 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 SM50T13AY part is unused and in its original packaging.
Return procedure for SM50T13AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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