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STMicroelectronics SM6T47AY
- Part No.:
- SM6T47AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T47AY.pdf
- Description:
- TVS DIODE 40VWM 64.5VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:7,880
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Product details
Overview
SM6T47AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMB package, designed to clamp transient overvoltages up to 64.5 V (10/1000 µs) with 9.7 A peak pulse current and 600 W peak power dissipation at 25 °C. It provides robust protection against ISO 7637-2 pulses (Pulse 1: −150 V; Pulse 2a: +112 V; Pulse 3a: −220 V; Pulse 3b: +150 V) and ESD per ISO 10605 (±30 kV air/contact discharge) in 12 V automotive power networks.
For engineers reviewing the SM6T47AY datasheet, SM6T47AY pinout, SM6T47AY application, or SM6T47AY equivalent, key selection criteria include clamping voltage (64.5 V), breakdown voltage range (40–49 V), low leakage (0.2 µA @ 25 °C), high junction temperature capability (150 °C), and compliance with automotive surge and ESD immunity standards.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device in parallel with sensitive automotive electronics, activating when reverse voltage exceeds its 46.7 V nominal breakdown (VBR) to divert surge energy away from downstream circuitry. Its planar silicon construction ensures stable leakage performance across temperature and long-term reliability under repeated transients.
It meets stringent automotive requirements including ISO 7637-2 (Pulse 1, 2a, 3a, 3b), ISO 10605 (±30 kV), and IEC 61000-4-4 Level 4 (4 kV), with dynamic resistance of 0.728 Ω enabling fast, predictable clamping response during 8/20 µs surges up to 48 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 46.7 V min / 49.0 V max at 1 mA - defines precise turn-on threshold for reliable overvoltage detection |
| Clamping Voltage (VCL) | 64.5 V at 9.7 A (10/1000 µs) - maximum voltage seen by protected IC during worst-case surge |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - sustained surge energy handling at ambient temperature |
| Leakage Current (IR) | 0.2 µA max at 25 °C, 1 µA max at 85 °C - negligible standby power loss and signal integrity impact |
| Junction Temperature Range | −55 °C to +150 °C - enables operation in engine bay and powertrain control units |
| Dynamic Resistance (RD) | 0.728 Ω - determines voltage rise above VBR under surge current (ΔV = IPP × RD) |
| ESD Withstand | ±30 kV (ISO 10605, 150 pF/330 Ω & 330 pF/330 Ω) - exceeds automotive ESD immunity requirement |
Pinout & Package
SM6T47AY is housed in an SMB (DO-214AA) surface-mount package with two terminals: Cathode (marked end) and Anode. The package measures 3.30–3.95 mm × 5.10–5.60 mm × 1.90–2.45 mm (L × W × H) and features matte tin-plated leads compliant with J-STD-002 and JEDEC registered outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge return path | Connected to ground or low-impedance reference; carries full transient current during clamping |
| Anode | Protected line input | Connected to the automotive supply rail (e.g., battery+ or load-dump node); voltage referenced to cathode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability across temperature cycling, humidity, and mechanical stress |
| Low dynamic resistance | 0.728 Ω minimizes clamping voltage overshoot during fast 8/20 µs transients |
| High-temperature operation | Rated for continuous use up to Tj = 150 °C - supports placement near heat sources |
| Low leakage current | 0.2 µA at 25 °C reduces quiescent power draw and avoids false triggering in high-impedance circuits |
| Automotive surge compliance | Fully tested to ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), Pulse 3b (+150 V) |
Applications
| Body Control Module (BCM) | Powertrain Control Unit (PCU) |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in vehicle body electronics. IC Role / Device Role: Unidirectional shunt clamp on 12 V supply rail upstream of LDO regulators. Use Value: Limits voltage to ≤64.5 V during ISO 7637-2 Pulse 3b (+150 V), preventing latch-up or gate oxide damage in 5 V/3.3 V logic. |
Use Scenario: Safeguarding engine ECU power inputs against severe load dump events during battery disconnection. IC Role / Device Role: Primary overvoltage clamp on main 12 V distribution line feeding MCU, CAN transceivers, and sensor interfaces. Use Value: Absorbs 600 W (10/1000 µs) without failure, maintaining system uptime during ±220 V ISO 7637-2 Pulse 3a transients. |
| Infotainment Head Unit | ADAS Camera Power Input |
|
Use Scenario: Shielding USB-C and HDMI power rails from ESD and conducted noise in center-stack displays. IC Role / Device Role: Secondary protection stage after primary fuse, placed adjacent to connector entry points. Use Value: Withstands ±30 kV contact discharge (ISO 10605) while adding <1 pF capacitance - no signal integrity degradation on high-speed lines. |
Use Scenario: Securing 12 V camera module input against ignition-induced transients and hot-swap surges. IC Role / Device Role: First-line transient suppressor before DC-DC converter input filter. Use Value: Clamps Pulse 1 (−150 V) within 1 ns, limiting voltage excursion to 64.5 V and preserving image sensor startup stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ47A | Same SMB package, but lower PPP = 400 W (10/1000 µs); VBR = 44.2–49.1 V; VCL = 67.0 V @ 6.0 A | Limited to less severe surge environments (e.g., non-critical interior modules) | Select when cost sensitivity outweighs need for full 600 W ISO 7637-2 Pulse 1 margin |
| 1.5SMC47A | Higher PPP = 1500 W (10/1000 µs), but larger SMC package (7.11 × 6.22 mm); VBR = 44.7–49.4 V; VCL = 67.0 V @ 22.4 A | Requires PCB area increase; suited for high-energy zones like alternator output | Choose only if board layout allows SMC footprint and system demands >600 W surge headroom |
Compared with SMAJ47A and 1.5SMC47A, SM6T47AY uniquely balances AEC-Q101 qualification, 600 W surge rating, SMB form factor, and 0.2 µA leakage-making it optimal for space-constrained, high-reliability automotive power nodes where thermal and ESD margins are critical.
Availability
SM6T47AY is available at Aetrix Electronics and suitable for automotive body control modules, powertrain ECUs, infotainment systems, and ADAS camera power inputs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SM6T47AY 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 capabilities and broad automotive qualification coverage.
The SM6TY series belongs to ST's automotive-grade Transil™ TVS portfolio, engineered specifically for robust transient suppression in 12 V and 24 V vehicle electrical architectures per ISO 7637-2 and ISO 10605.
FAQ
What is the maximum clamping voltage of SM6T47AY under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 64.5 V at 9.7 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases with junction temperature per the αT coefficient (10.1 × 10−4/°C), reaching ~67.2 V at Tj = 125 °C.
Is SM6T47AY suitable for protecting CAN bus lines?
No - SM6T47AY is rated for 12 V automotive supply rails, not data lines. Its 64.5 V clamping voltage far exceeds typical CAN common-mode limits (±40 V). For CAN protection, ST recommends dedicated low-capacitance devices like ESDCAN03-2BM3Y or TPD2E001.
Does SM6T47AY meet RoHS and REACH requirements?
Yes - SM6T47AY is manufactured in ST's ECOPACK2-compliant facilities and conforms to RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with lead-free matte tin plating and halogen-free molding compound.
Can SM6T47AY be used in 24 V commercial vehicle systems?
Not recommended as primary protection - its 46.7–49.0 V breakdown is optimized for 12 V nominal systems. In 24 V applications, higher-voltage variants like SM6T82AY (VBR = 70–86 V) or SM6T100AY should be selected to avoid premature conduction during normal operating transients.
SM6T47AY 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):
- 40V
- Voltage - Breakdown (Min):
- 44V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 9.7A
- 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
SM6T47AY FAQ
1.How can I place an order for SM6T47AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T47AY 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 SM6T47AY reliable?
The price and inventory of SM6T47AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T47AY is usually 5 days.
3.What payment methods are accepted for SM6T47AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T47AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T47AY?
SM6T47AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T47AY 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 SM6T47AY?
For technical support, including SM6T47AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T47AY requirements.
6.How does Aetrix verify that SM6T47AY is sourced from the original manufacturer or authorized distributors?
All SM6T47AY 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 SM6T47AY meets industry standards.
7.What is the process for return or replacement of SM6T47AY?
All SM6T47AY units undergo pre-shipment inspection (PSI). If there is an issue with SM6T47AY, 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 SM6T47AY part is unused and in its original packaging.
Return procedure for SM6T47AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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