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STMicroelectronics SM15T47AY
- Part No.:
- SM15T47AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T47AY.pdf
- Description:
- TVS DIODE 40.2VWM 84VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:1,792
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Product details
Overview
SM15T47AY from STMicroelectronics is a unidirectional automotive-grade transient voltage suppressor (TVS) diode in SMC package, designed for ISO 7637-2 pulse protection in 12 V vehicle systems. It features 47 V breakdown voltage (VBR = 40.2–49.4 V), 64.5 V clamping voltage (VCL) at 23.2 A (10/1000 µs), 1500 W peak pulse power, and AEC-Q101 qualification for under-hood applications including engine control units and body electronics.
For engineers reviewing the SM15T47AY datasheet, SM15T47AY pinout, SM15T47AY application, or SM15T47AY equivalent, this page delivers verified electrical parameters, automotive surge compliance data (ISO 7637-2 Pulse 1/2a/3a/3b), thermal derating curves, SMC footprint details, and direct comparison with functionally aligned TVS alternatives - all validated against DS6928 Rev 6.
Technical Context
The SM15T47AY employs planar junction technology to achieve low leakage (≤0.2 µA at 25 °C) and high junction temperature operation (Tj up to +150 °C), enabling long-term reliability in thermally stressed automotive environments. Its unidirectional configuration provides forward conduction path for reverse-polarity battery connection protection while suppressing transients on positive supply lines.
Clamping behavior is defined by dynamic resistance (RD = 0.653 Ω at 25 °C), enabling precise VCL prediction via VCL = VBR(max) + RD × IPP. It meets IEC 61000-4-2 (±30 kV contact/air), ISO 10605 (±30 kV), and ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) requirements without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 40.2 / 44.7 / 49.4 V - ensures reliable turn-on above system nominal voltage while avoiding false triggering during load dump overshoot |
| VCL @ IPP = 23.2 A | 64.5 V - limits downstream IC voltage stress during 10/1000 µs surges in 12 V automotive networks |
| PPP (10/1000 µs) | 1500 W - sustains high-energy transients such as ISO 7637-2 Pulse 1 without degradation |
| IR @ VRM = 38.0 V | 0.2 µA max at 25 °C - minimizes standby current loss in always-on vehicle modules |
| Tj operating range | −55 to +150 °C - supports placement near heat sources (e.g., ECUs, powertrain controllers) |
| Dynamic resistance RD | 0.653 Ω - enables predictable clamping rise with increasing surge current |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with IPC7531-compliant footprint and 0.25 g mass |
Pinout & Package
SM15T47AY uses the SMC (DO-214AB) package: molded plastic case with two coplanar J-bend leads, 7.75–8.15 mm body length, 5.55–6.25 mm width, and 2.45 mm max height. Lead finish is matte tin plating per JESD 22-B102 E3 and MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink node | Connected to protected line (e.g., battery rail); conducts transient energy to ground when VAK > VBR |
| Anode | Reference/ground return | Connected to chassis or system ground; completes conduction path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use across temperature, humidity, mechanical shock, and lifetime cycling per JESD47 |
| Low leakage at high Tj | 1 µA max at 85 °C - preserves battery life in always-on modules like telematics and alarm systems |
| ISO 7637-2 compliance | Withstands −150 V (Pulse 1), +112 V (Pulse 2a), −220 V (Pulse 3a), +150 V (Pulse 3b) without failure |
| High Tj power derating | Delivers 1250 W at Tj = 150 °C - maintains protection margin in hot under-hood locations |
| ESD robustness | Exceeds IEC 61000-4-2 Level 4 (±30 kV air/contact) and ISO 10605 (±30 kV, C = 150/330 pF) |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Line |
|---|---|
Use Scenario: Protects 12 V supply rail of gasoline/diesel engine ECUs against load dump (ISO 7637-2 Pulse 1) and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps surge voltage to ≤64.5 V, preventing damage to 40 V-rated input capacitors and LDO regulators. | Use Scenario: Shields high-speed CAN FD transceivers (e.g., TJA1044) from ESD and coupled noise on vehicle body wiring harnesses. IC Role / Device Role / Timing Role: Placed in series with CAN_H/CAN_L lines before connector, referenced to chassis ground. Use Value: Limits transient-induced common-mode voltage swing to <10 V, preserving signal integrity and bit error rate below 10−12. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Guards 12 V input of rear-view or surround-view camera modules exposed to ignition noise and jump-start surges. IC Role / Device Role / Timing Role: Mounted directly at camera PCB edge connector, cathode to supply, anode to chassis ground. Use Value: Maintains <0.5 µA leakage at 85 °C, avoiding dark current increase in CMOS image sensors. | Use Scenario: Protects H-bridge gate drivers and current sense amplifiers in EPS motor control units from inductive kickback during PWM commutation. IC Role / Device Role / Timing Role: Installed across motor driver VDD rail and ground, upstream of bulk capacitance. Use Value: Absorbs 10 kW (8/20 µs) pulses from motor coil collapse without thermal runaway (Tj ≤ 150 °C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ47A | Lower PPP (400 W), higher VCL (77 V @ 12.3 A), non-AEC-Q101 | Not qualified for automotive under-hood use; limited to interior modules with lower surge exposure | Select only for cost-sensitive non-safety-critical cabin electronics where ISO 7637-2 compliance is not required |
| 1.5KE47A | Through-hole DO-201 package, 1500 W rating but no AEC-Q101, higher leakage (5 µA) | Requires board real estate and wave soldering; unsuitable for automated SMT production of automotive PCBs | Use only for legacy repair or prototyping where SMC footprint compatibility is not mandatory |
Compared with SMAJ47A and 1.5KE47A, SM15T47AY delivers AEC-Q101 validation, SMC surface-mount compatibility, 0.2 µA leakage at 25 °C, and guaranteed ISO 7637-2 Pulse 1/2a/3a/3b performance - making it the sole choice for new automotive designs requiring production-grade surge immunity.
Availability
SM15T47AY is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera power supplies, and electric power steering systems requiring stable component supply across automotive production lifecycles.
Supply support for SM15T47AY 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.
The SM15TxxAY series belongs to ST's automotive-grade TVS portfolio, engineered specifically to meet stringent ISO 7637-2 and AEC-Q101 requirements for 12 V and 24 V vehicle electrical systems.
FAQ
What is the maximum clamping voltage of SM15T47AY at 23.2 A (10/1000 µs)?
The maximum clamping voltage (VCL) is 64.5 V at 23.2 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases with junction temperature at a coefficient of 10.1 × 10−4/°C, reaching ~67.2 V at Tj = 150 °C per the datasheet's αT formula.
Does SM15T47AY support bidirectional surge suppression?
No - SM15T47AY is unidirectional and protects only positive-going transients on the cathode-connected line. For bidirectional protection (e.g., data lines), ST offers the SM15T47CAY variant, which has symmetrical breakdown in both polarities and identical VBR and VCL specs.
Can SM15T47AY be used in 24 V commercial vehicle systems?
No - its 47 V VBR and 64.5 V VCL are optimized for 12 V nominal systems. For 24 V applications, ST recommends SM15T82AY (VBR = 70–86 V), which maintains appropriate margin above 28 V load dump peaks and complies with ISO 7637-2 Pulse 1 (−200 V) for heavy-duty vehicles.
What is the recommended PCB footprint for SM15T47AY?
The official footprint per DS6928 Rev 6 specifies 8.19 mm pad length, 5.11 mm pad width, 3.14 mm center-to-center spacing, and 1.54 mm solder mask opening per lead. Copper area ≥3 cm² per pad reduces Rth(j-a) to <60 °C/W, critical for sustaining 1500 W pulses in confined ECU enclosures.
SM15T47AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15TY, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 40.2V
- Voltage - Breakdown (Min):
- 44.7V
- Voltage - Clamping (Max) @ Ipp:
- 84V
- Current - Peak Pulse (10/1000µs):
- 119A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SM15T47AY FAQ
1.How can I place an order for SM15T47AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T47AY 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 SM15T47AY reliable?
The price and inventory of SM15T47AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T47AY is usually 5 days.
3.What payment methods are accepted for SM15T47AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T47AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T47AY?
SM15T47AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T47AY 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 SM15T47AY?
For technical support, including SM15T47AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T47AY requirements.
6.How does Aetrix verify that SM15T47AY is sourced from the original manufacturer or authorized distributors?
All SM15T47AY 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 SM15T47AY meets industry standards.
7.What is the process for return or replacement of SM15T47AY?
All SM15T47AY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T47AY, 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 SM15T47AY part is unused and in its original packaging.
Return procedure for SM15T47AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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