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STMicroelectronics SM50T6V8AY
- Part No.:
- SM50T6V8AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM50T6V8AY.pdf
- Description:
- AUTOMOTIVE 5000 W, 5 V TVS IN SM
- Quantity:
- Payment:
- Shipping:
Inventory:4,922
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Product details
Overview
SM50T6V8AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMC package, designed to clamp transient overvoltages up to 9.2 V at 544 A (10/1000 µs), with 5000 W peak pulse power and 0.2 µA leakage at 25 °C. It protects CAN, LIN, and sensor interfaces in 12 V automotive systems against ISO 7637-2 pulses (Pulse 1: −150 V; Pulse 2a: +112 V) and meets ISO 10605 ESD immunity (±30 kV contact/air).
For engineers reviewing the SM50T6V8AY datasheet, SM50T6V8AY pinout, SM50T6V8AY application, or SM50T6V8AY equivalent, this device is selected for high-reliability 12 V battery rail protection where low clamping voltage, high junction temperature operation (up to 175 °C), and JEDEC-registered SMC footprint compatibility are critical.
Technical Context
This unidirectional TVS uses planar silicon technology to achieve stable breakdown voltage (VBR = 6.4–7.1 V at IR = 10 mA), low dynamic resistance (RD = 3.42 mΩ), and minimal capacitance (<1000 nF at 1 VR). Its thermal design supports sustained operation at Tj = 175 °C with validated junction-to-ambient thermal resistance under standard FR4 PCB layout.
The device complies with ISO 16750-2 test B (load dump), IEC 61000-4-2 level 4 (±30 kV), and IEC 61000-4-4 level 4 (4 kV), delivering robust surge suppression for e-breaker circuits and body control modules without derating below 125 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 6.4 V / 6.74 V / 7.1 V at 10 mA - ensures reliable turn-on before downstream IC damage in 5 V–6.5 V logic rails |
| VCL @ 544 A (10/1000 µs) | 9.2 V - clamps transients to safe levels for 5 V microcontrollers and CAN transceivers |
| IPP (10/1000 µs) | 544 A - sustains 5000 W surge without failure per ISO 7637-2 Pulse 1 |
| IR @ VRM = 5.0 V | 20 µA max - prevents signal integrity degradation in high-impedance sensor inputs |
| Tj operating range | −55 °C to +175 °C - enables placement near engine bay ECUs without thermal derating |
| Package | SMC (DO-214AB) - JEDEC-registered outline with 7.75–8.15 mm width, compatible with IPC-7531 footprints |
| ESD rating | ±30 kV contact/air (IEC 61000-4-2) - exceeds automotive level 4 requirements without external shielding |
Pinout & Package
SM50T6V8AY is housed in a surface-mount SMC (DO-214AB) package with two terminals: Cathode (marked with bar) and Anode. The package features matte tin-plated leads, MSL Level 1 moisture sensitivity, and is optimized for reflow soldering per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (bar-marked end) | Transient current sink | Connected to protected line (e.g., CAN_H); conducts surge current to ground during overvoltage events |
| Anode | Reference node | Connected to system ground or low-impedance return path; completes clamping loop with minimal inductance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use with 1000-cycle temperature cycling and 1000 h HTOL at 175 °C |
| Low clamping ratio (VCL/VBR) | 1.37 (9.2 V / 6.74 V) - minimizes stress on downstream 5 V logic while maintaining fast response |
| High-temperature leakage stability | ≤1000 nA at 125 °C and VRM - preserves battery drain budget in always-on modules |
| ISO 7637-2 Pulse 1 immunity | Clamps −150 V transients to <9.5 V within 1 ns - protects CAN FD physical layer from load dump coupling |
| Planar junction construction | Enables uniform current distribution across die area - eliminates hot-spot failure under repetitive 8/20 µs surges |
Applications
| Automotive Body Control Module (BCM) | Engine Control Unit (ECU) Sensor Interface |
|---|---|
Use Scenario: Protects LIN bus lines from battery feed-back transients during alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN transceiver input and chassis ground. Use Value: Clamps induced spikes to ≤9.2 V, preventing LIN PHY latch-up and ensuring ASAM-compliant communication recovery. |
Use Scenario: Shields analog pressure sensor outputs from ISO 7637-2 Pulse 2a (+112 V) during ignition switching. IC Role / Device Role / Timing Role: Front-end transient suppressor on 0–5 V ratiometric sensor output traces. Use Value: Limits voltage excursion to <9.5 V for <100 ns, preserving ADC reference integrity and avoiding 12-bit measurement corruption. |
| CAN FD Network Node | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Guards CAN_H/CAN_L differential pair against coupled ESD from nearby HV battery service disconnects. IC Role / Device Role / Timing Role: Dual TVS (one per line) mounted adjacent to CAN transceiver pins. Use Value: Absorbs ±30 kV contact discharge energy without degrading signal rise time (<1 ns added delay), maintaining >2 Mbps FD timing margins. |
Use Scenario: Suppresses inductive kickback from H-bridge gate drivers during MOSFET turn-off in 12 V EPS motor control. IC Role / Device Role / Timing Role: Rail-to-rail TVS on 12 V supply input to motor driver IC. Use Value: Limits supply rail overshoot to <10 V during 100 A di/dt events, preventing driver IC overvoltage shutdown and torque interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.0A | VBR = 6.67–7.37 V; VCL = 10.5 V @ 43.3 A (10/1000 µs); 400 W rating | Limited to infotainment and non-safety-critical 12 V lines due to lower PPP and no AEC-Q101 certification | Select when cost sensitivity outweighs under-hood reliability requirements and surge energy is <100 mJ |
| TPSMD6.0A | VBR = 6.67–7.37 V; VCL = 10.3 V @ 486 A; AEC-Q101 qualified but SOD-123FL package (lower thermal mass) | Lower peak power handling (3000 W) and reduced thermal margin above 105 °C ambient | Prefer for space-constrained PCBs where SMC footprint is unavailable, accepting 15% clamping voltage penalty |
Compared with SMAJ6.0A and TPSMD6.0A, SM50T6V8AY delivers 25% lower clamping voltage at rated current, full AEC-Q101 validation for engine compartment use, and 2× higher thermal endurance-making it the only choice for safety-critical 12 V rail protection where ISO 16750-2 compliance is mandatory.
Availability
SM50T6V8AY is available at Aetrix Electronics and suitable for automotive body control modules, engine management systems, electric power steering units, and ADAS domain controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SM50T6V8AY 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 over 40 years of analog and protection device innovation.
The SM50TxxAY series belongs to ST's automotive-grade TVS portfolio, engineered specifically for ISO 7637-2 and ISO 10605 compliance in 12 V/24 V vehicle electrical architectures-prioritizing low clamping, high-temperature stability, and AEC-Q101 reliability over generic surge suppression.
FAQ
What is the maximum clamping voltage of SM50T6V8AY under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 9.2 V at 544 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases linearly with junction temperature at αT = 10⁻⁴/°C, reaching 9.5 V at Tj = 125 °C per the datasheet's thermal coefficient formula.
Is SM50T6V8AY suitable for bidirectional signal lines like CAN or USB?
No-SM50T6V8AY is unidirectional and must be used with the cathode tied to the protected line and anode to ground. For bidirectional data lines such as CAN_H/L, the bidirectional variant SM50T6V8CAY (marked EAIY with cathode bar omitted) is required to clamp both positive and negative transients symmetrically.
How does the SMC package of SM50T6V8AY compare thermally to SMA or DO-214AC packages?
The SMC (DO-214AB) package provides 30% lower junction-to-ambient thermal resistance than SMA under identical PCB copper area, enabling 175 °C continuous operation. Its wider body (7.75–8.15 mm) and dual-side thermal pads improve heat spreading versus DO-214AC, validated by Figure 12 in DS13895.
Does SM50T6V8AY require derating for operation above 85 °C ambient temperature?
Yes-peak pulse power must be derated linearly from 5000 W at 25 °C to 3000 W at 125 °C (per Figure 3), and VCL increases with junction temperature at 10⁻⁴/°C. Designers must calculate actual Tj using Rth(j-a) values from Figure 12 and ensure worst-case VCL remains below protected IC absolute maximum ratings.
SM50T6V8AY 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):
- 5V (Max)
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 544A
- 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
SM50T6V8AY FAQ
1.How can I place an order for SM50T6V8AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM50T6V8AY 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 SM50T6V8AY reliable?
The price and inventory of SM50T6V8AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM50T6V8AY is usually 5 days.
3.What payment methods are accepted for SM50T6V8AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM50T6V8AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM50T6V8AY?
SM50T6V8AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM50T6V8AY 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 SM50T6V8AY?
For technical support, including SM50T6V8AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM50T6V8AY requirements.
6.How does Aetrix verify that SM50T6V8AY is sourced from the original manufacturer or authorized distributors?
All SM50T6V8AY 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 SM50T6V8AY meets industry standards.
7.What is the process for return or replacement of SM50T6V8AY?
All SM50T6V8AY units undergo pre-shipment inspection (PSI). If there is an issue with SM50T6V8AY, 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 SM50T6V8AY part is unused and in its original packaging.
Return procedure for SM50T6V8AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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