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STMicroelectronics SM50T16AY
- Part No.:
- SM50T16AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM50T16AY.pdf
- Description:
- AUTOMOTIVE 5000 W, 14 V TVS IN S
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
SM50T16AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMC package, designed to clamp transient surges up to 5000 W (10/1000 µs) and 1151 W (8/20 µs), with a standoff voltage (VRM) of 14 V, breakdown voltage (VBR) min 15.7 V at 1 mA, and clamping voltage (VCL) of 23.1 V at 216 A - deployed in 12 V battery rail protection for engine control units and body electronics.
For engineers reviewing the SM50T16AY datasheet, SM50T16AY pinout, SM50T16AY application, or SM50T16AY equivalent, this page delivers verified electrical specs, ISO 7637-2 pulse response data, junction temperature derating curves, JEDEC-compliant SMC footprint details, and automotive-grade ESD/EMI immunity validation per IEC 61000-4-2 (±30 kV), ISO 10605 (±30 kV), and ISO 16750 compliance support.
Technical Context
This unidirectional TVS diode uses planar silicon technology to achieve low leakage current (0.2 µA at 25 °C) and high thermal stability across -55 °C to +175 °C operating junction temperature. Its dynamic resistance (RD) is 10.2 mΩ at 25 °C, enabling precise clamping under fast transients like ISO 7637-2 Pulse 1 (-150 V) and Pulse 3a (-220 V).
The device meets stringent automotive surge standards: it suppresses load dump pulses (ISO 7637-2 Pulse 5b) up to 87 V with 150 ms duration, and complies with IEC 61000-4-4 Level 4 (4 kV), while maintaining VCL ≤ 23.1 V at IPP = 216 A for 10/1000 µs waveform - critical for safeguarding CAN transceivers and microcontroller power inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 5000 W - sustains full-rated surge energy without failure in 12 V automotive systems during ISO 7637-2 Pulse 1 and 3a events. |
| Standoff Voltage (VRM) | 14 V - blocks normal 12 V battery rail operation while triggering only above system overvoltage thresholds. |
| Breakdown Voltage (VBR) | 15.7 V min at 1 mA - ensures reliable turn-on before sensitive downstream ICs experience overvoltage stress. |
| Clamping Voltage (VCL) | 23.1 V at 216 A (10/1000 µs) - limits transient voltage seen by protected circuitry to safe levels compatible with 24 V tolerant interfaces. |
| Leakage Current (IRM) | 0.2 µA max at VRM and 25 °C - minimizes standby power loss in always-on vehicle modules like gateway ECUs. |
| Junction Temperature Range | -55 °C to +175 °C - supports under-hood placement near engines and transmission control units without thermal derating. |
| ESD Withstand (IEC 61000-4-2) | ±30 kV contact & air discharge - exceeds Level 4 requirements, eliminating need for secondary ESD protection on PCBs. |
Pinout & Package
SM50T16AY is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads, optimized for high-current surge handling and automated assembly. The package features a 7.75–8.15 mm body width (E), 5.55–6.25 mm length (D), and 1.90–2.45 mm height (A1), conforming to IPC7531 footprint recommendations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or chassis return path; enables unidirectional clamping from cathode to anode during negative transients. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery feed); conducts surge current to ground when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature, humidity, vibration, and lifetime reliability per JESD22-A108. |
| Planar silicon construction | Enables stable VBR drift (αT = 10⁻⁴/°C) and low leakage over 15+ year vehicle service life. |
| Dynamic resistance (RD) | 10.2 mΩ at 25 °C - ensures minimal VCL rise under high di/dt transients like ISO 7637-2 Pulse 2a (+112 V). |
| UL94 V0 flammability rating | Self-extinguishing epoxy molding compound prevents fire propagation in enclosed junction boxes. |
| JEDEC MSL Level 1 | Unlimited floor life at ≤30 °C/85% RH - eliminates bake requirements prior to reflow soldering. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus Line |
|---|---|
|
Use Scenario: Protects 12 V supply rail of gasoline/diesel engine ECUs against load dump (ISO 7637-2 Pulse 5b) and alternator-induced spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive transients between battery and LDO/regulator input, limiting VIN to ≤23.1 V during 216 A surges. Use Value: Prevents brownout resets and gate oxide damage in MCU power management ICs by holding rail voltage within 24 V tolerance window. |
Use Scenario: Shields LIN transceiver PHY layer from ESD events (ISO 10605 ±30 kV) and coupled noise from adjacent high-current loads. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF at 10 V) unidirectional TVS placed directly at LIN connector, clamping fast-rising ESD pulses before signal integrity degrades. Use Value: Maintains <1 µs response time and preserves LIN bus timing margins (<20 ns jitter increase) while meeting OEM ESD test plans. |
| Automotive Infotainment Power Supply | Electric Power Steering (EPS) Sensor Interface |
|
Use Scenario: Guards DC-DC converter input stage in head unit against reverse battery connection and jump-start surges (ISO 16750-2 Test B). IC Role / Device Role / Timing Role: Positioned upstream of buck controller, absorbs 150 ms/87 V load dump energy without thermal runaway due to 175 °C Tj rating. Use Value: Eliminates need for redundant TVS stages, reducing BOM count and PCB area while sustaining >100,000 surge cycles. |
Use Scenario: Protects analog front-end of torque/position sensors in EPS systems from ISO 7637-2 Pulse 3b (+150 V) induced by motor commutation noise. IC Role / Device Role / Timing Role: Clamps transients on sensor VREF and signal lines with sub-100 ps response, preventing ADC saturation and false fault reporting. Use Value: Ensures functional safety compliance (ASIL-B) by avoiding sensor data corruption during aggressive steering maneuvers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A | Lower peak power (400 W), higher VCL (23.2 V at 17.3 A), SMC package but non-AEC-Q101 rated. | Limited to non-safety-critical 12 V consumer electronics; lacks ISO 7637-2 Pulse 5b validation and 175 °C Tj. | Select only for cost-sensitive non-automotive designs where AEC-Q101 and load dump immunity are not required. |
| TPSMA6L14A | Same 14 V VRM, but lower PPP (600 W), higher RD (15 mΩ), and no ISO 10605 ±30 kV certification. | Not qualified for under-hood deployment; fails ISO 16750-2 Test B due to thermal limitation at 150 °C max Tj. | Acceptable for cabin-mounted modules with ambient <85 °C, but unsuitable for ECU or EPS integration. |
Compared with SMAJ14A and TPSMA6L14A, SM50T16AY delivers 8.3× higher surge power handling, guaranteed AEC-Q101 reliability, and full ISO 7637-2/10605/16750 compliance - making it the sole choice for ASIL-B power rail protection where single-point failure must be avoided.
Availability
SM50T16AY is available at Aetrix Electronics and suitable for engine control units, body control modules, and electric power steering systems requiring stable component supply across extended automotive production lifecycles.
Supply support for SM50T16AY 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 silicon solutions for automotive, industrial, and consumer markets since 1987.
The SM50TxxAY series belongs to ST's automotive-grade transient voltage suppression portfolio, engineered specifically to meet OEM requirements for robustness against ISO 7637-2, ISO 10605, and ISO 16750 electrical stress in 12 V/24 V vehicle architectures.
FAQ
What is the maximum clamping voltage of SM50T16AY under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SM50T16AY is 23.1 V at 216 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature at a coefficient of 10⁻⁴/°C, reaching approximately 24.5 V at 175 °C Tj, as confirmed in Table 2 of DS13895 Rev 2.
Does SM50T16AY support bidirectional transient suppression?
No, SM50T16AY is a unidirectional TVS diode, indicated by the "AY" suffix (versus "CAY" for bidirectional). It clamps only positive transients from cathode to anode and blocks reverse voltage up to 14 V; for bidirectional protection, SM50T16CAY must be used instead.
Can SM50T16AY be used in 24 V commercial vehicle systems?
SM50T16AY is rated for 14 V standoff and optimized for 12 V automotive systems. While its 23.1 V clamping voltage provides margin above 12 V rails, it is not recommended for primary 24 V battery protection - ST offers SM50T26AY (22 V VRM) and SM50T33AY (28 V VRM) for 24 V applications with appropriate VCL headroom.
What is the thermal resistance junction-to-ambient for SM50T16AY on standard FR4 PCB?
On a standard FR4 board with 70 µm copper thickness and recommended footprint (Figure 24), SM50T16AY exhibits Rth(j-a) ≈ 100 °C/W for small copper areas, improving to ~40 °C/W with ≥3 cm² copper pour per lead (Figure 12). This enables sustained operation at 175 °C Tj under pulsed conditions without heatsinking.
SM50T16AY 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):
- 14V (Max)
- Voltage - Breakdown (Min):
- 15.7V
- Voltage - Clamping (Max) @ Ipp:
- 23.1V
- Current - Peak Pulse (10/1000µs):
- 216A
- 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
SM50T16AY FAQ
1.How can I place an order for SM50T16AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM50T16AY 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 SM50T16AY reliable?
The price and inventory of SM50T16AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM50T16AY is usually 5 days.
3.What payment methods are accepted for SM50T16AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM50T16AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM50T16AY?
SM50T16AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM50T16AY 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 SM50T16AY?
For technical support, including SM50T16AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM50T16AY requirements.
6.How does Aetrix verify that SM50T16AY is sourced from the original manufacturer or authorized distributors?
All SM50T16AY 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 SM50T16AY meets industry standards.
7.What is the process for return or replacement of SM50T16AY?
All SM50T16AY units undergo pre-shipment inspection (PSI). If there is an issue with SM50T16AY, 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 SM50T16AY part is unused and in its original packaging.
Return procedure for SM50T16AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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