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STMicroelectronics SM6T56AY
- Part No.:
- SM6T56AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T56AY.pdf
- Description:
- TVS DIODE 47.6VWM 76.6VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,373
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Product details
Overview
SM6T56AY from STMicroelectronics is a unidirectional automotive-grade transient voltage suppression (TVS) diode in SMB package, designed for ISO 7637-2 pulse protection in 12 V vehicle systems. It features a 56 V breakdown voltage (VBR = 56 V), 76.6 V clamping voltage (VCL) at 7.8 A peak pulse current, 600 W peak pulse power (10/1000 µs), AEC-Q101 qualification, and operates up to 150 °C junction temperature.
For engineers reviewing the SM6T56AY datasheet, SM6T56AY pinout, SM6T56AY application, or SM6T56AY equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1 (–150 V), low leakage (≤0.2 µA at 25 °C), thermal stability at Tj = 150 °C, and compatibility with IPC7531-compliant SMB footprints.
Technical Context
This TVS diode uses planar silicon technology to achieve low dynamic resistance (RD = 1.03 Ω) and stable VBR temperature coefficient (αT = 10.0 × 10−4/°C), enabling precise overvoltage clamping across automotive temperature ranges. Its unidirectional configuration provides forward conduction path for negative transients while blocking reverse leakage below 56 V.
The device meets IEC 61000-4-2 (±30 kV air/contact discharge), ISO 10605 (C = 330 pF/R = 330 Ω), and ISO 7637-2 Pulse 1 (–150 V), Pulse 2a (+112 V), Pulse 3a (–220 V), and Pulse 3b (+150 V) requirements - all validated at Tj = 150 °C with up to 515 W surge capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 47.6 V - Ensures reliable triggering above normal 12 V system operating range |
| VCL @ IPP = 7.8 A | 76.6 V - Limits downstream IC voltage during ISO 7637-2 Pulse 1 (–150 V) |
| PPP (10/1000 µs) | 600 W - Sustains high-energy surges without failure at Tamb = 25 °C |
| IRM @ VRM = 45.6 V | 0.2 µA max at 25 °C - Minimizes standby power loss in always-on automotive modules |
| Tj max | 150 °C - Enables placement near heat sources (e.g., engine control units) without derating |
| RD | 1.03 Ω - Reduces clamping voltage rise under high-current transients (VCL = VBR + RD × IPP) |
| Package | SMB (DO-214AA) - Industry-standard surface-mount outline per JEDEC MO-136AC, IPC7531 footprint compatible |
Pinout & Package
SMB (DO-214AA) package: 2-terminal surface-mount device with cathode band marking; dimensions per JEDEC MO-136AC (L = 0.75–1.50 mm, W = 3.30–3.95 mm, H = 5.10–5.60 mm); matte tin-plated leads compliant with J-STD-002, JESD 22-B102 E3, and MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground | Provides return path for negative transients (e.g., ISO 7637-2 Pulse 1, Pulse 3a) |
| Cathode (banded end) | High-side connection to protected line (e.g., CAN_H, LIN, sensor supply) | Clamps positive overvoltage events to VCL while blocking normal 12 V operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including temperature cycling, humidity, and mechanical shock |
| ISO 7637-2 compliance | Withstands Pulse 1 (–150 V), Pulse 2a (+112 V), Pulse 3a (–220 V), and Pulse 3b (+150 V) without degradation |
| Low leakage at high Tj | ≤1 µA at 85 °C - Maintains signal integrity in always-on body control modules |
| High Tj surge capability | 515 W (10/1000 µs) at Tj = 150 °C - Eliminates need for external thermal derating in compact ECUs |
| Matte tin lead finish | RoHS-compliant, solderable per J-STD-020 MSL Level 1, whisker-resistant per JESD-201 Class 2 |
Applications
| Engine Control Unit (ECU) Power Input | CAN Bus Transceiver Protection |
|---|---|
|
Use Scenario: 12 V battery feed to microcontroller power rail subjected to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and LDO input to clamp negative transients (Pulse 1, Pulse 3a) and limit positive spikes to ≤76.6 V. Use Value: Prevents LDO latch-up or gate oxide damage during cold-crank or jump-start events where VIN dips to –150 V. |
Use Scenario: CAN_H line exposed to ESD and coupled noise in vehicle wiring harnesses. IC Role / Device Role / Timing Role: TVS connected between CAN_H and ground to suppress ±30 kV ESD (IEC 61000-4-2) and fast ISO 7637-2 pulses without affecting 1 Mbps signal integrity. Use Value: Maintains CAN bus uptime by limiting voltage excursion to <76.6 V during 8/20 µs transients, preserving transceiver common-mode range. |
| Body Control Module (BCM) Sensor Inputs | Infotainment System USB Power Line |
|
Use Scenario: Analog sensor supply (e.g., pressure, temperature) routed through long harnesses susceptible to inductive switching noise. IC Role / Device Role / Timing Role: TVS placed at PCB entry point to clamp transients before reaching precision ADC reference or op-amp inputs. Use Value: Keeps sensor offset error <1 LSB by limiting transient-induced voltage overshoot to ≤76.6 V at 7.8 A peak. |
Use Scenario: 5 V USB VBUS line in head unit exposed to hot-plug ESD and conducted noise from vehicle DC/DC converters. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS-to-ground path to absorb ±30 kV contact discharge while maintaining <100 ns response time. Use Value: Prevents USB controller reset or port disable by clamping VBUS to 76.6 V before internal 5.5 V overvoltage threshold is exceeded. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ56A | Same SMB package, but lower PPP = 400 W (10/1000 µs); VCL = 93.6 V @ 4.3 A | Not rated for ISO 7637-2 Pulse 1 (–150 V) at full energy; limited to infotainment or non-safety-critical modules | Select when cost sensitivity outweighs automotive pulse robustness; verify clamping margin against system VMAX. |
| 1.5SMC56A | Higher PPP = 1500 W (10/1000 µs), but larger SMC package (DO-214AB); VCL = 93.6 V @ 16 A | Requires PCB area increase (~3× SMB footprint); suitable for high-power gate drivers or alternator output lines | Choose only if 600 W is insufficient and board space allows SMC; avoid in space-constrained ECUs. |
Compared with SMAJ56A and 1.5SMC56A, SM6T56AY uniquely balances AEC-Q101 qualification, SMB footprint, 600 W surge rating, and 76.6 V clamping - making it optimal for compact, thermally constrained automotive control units requiring full ISO 7637-2 compliance.
Availability
SM6T56AY is available at Aetrix Electronics and suitable for engine control units, CAN bus nodes, body control modules, and infotainment power supplies requiring stable component supply across automotive production lifecycles.
Supply support for SM6T56AY 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 AEC-Q100/Q101 validation capabilities.
The SM6TY series is part of ST's automotive-grade Transil™ TVS portfolio, engineered specifically for robust ISO 7637-2 and ISO 10605 protection in 12 V and 24 V vehicle networks - prioritizing low leakage, high Tj reliability, and planar process consistency.
FAQ
What is the maximum clamping voltage of SM6T56AY under ISO 7637-2 Pulse 1 conditions?
The SM6T56AY clamps to 76.6 V at 7.8 A (10/1000 µs waveform), which directly addresses ISO 7637-2 Pulse 1 (–150 V) stress on 12 V systems. This value is measured at Tj = 25 °C and remains within ±5% up to Tj = 150 °C due to its 10.0 × 10−4/°C temperature coefficient.
Can SM6T56AY be used in bidirectional signal lines like CAN or LIN?
No - SM6T56AY is unidirectional and must be used with cathode toward the protected line (e.g., CAN_H) and anode to ground. For bidirectional data lines, ST's SM6T56CAY variant is required, as it provides symmetrical clamping for both polarities without polarity-sensitive placement.
How does SM6T56AY's dynamic resistance affect system-level protection performance?
With RD = 1.03 Ω, SM6T56AY limits voltage overshoot during fast transients: VCL = VBR + RD × IPP. At 7.8 A, this adds only 8.0 V to the 56 V breakdown, yielding 76.6 V clamping - critical for protecting 5 V or 3.3 V logic interfaces downstream of LDOs or DC/DC converters.
Is SM6T56AY compatible with lead-free reflow profiles per J-STD-020?
Yes - SM6T56AY supports standard lead-free reflow with peak temperature of 240–245 °C for 60 seconds (max 90 s), ramp rates ≤3 °C/s, and cooling rate ≥2 °C/s, per ST's documented profile (DS6905 Rev 11, Figure 25) and J-STD-020 MSL Level 1 classification.
SM6T56AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6TY, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 47.6V
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 76.6V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SM6T56AY FAQ
1.How can I place an order for SM6T56AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T56AY 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 SM6T56AY reliable?
The price and inventory of SM6T56AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T56AY is usually 5 days.
3.What payment methods are accepted for SM6T56AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T56AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T56AY?
SM6T56AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T56AY 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 SM6T56AY?
For technical support, including SM6T56AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T56AY requirements.
6.How does Aetrix verify that SM6T56AY is sourced from the original manufacturer or authorized distributors?
All SM6T56AY 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 SM6T56AY meets industry standards.
7.What is the process for return or replacement of SM6T56AY?
All SM6T56AY units undergo pre-shipment inspection (PSI). If there is an issue with SM6T56AY, 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 SM6T56AY part is unused and in its original packaging.
Return procedure for SM6T56AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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