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STMicroelectronics SM15T82AY
- Part No.:
- SM15T82AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T82AY.pdf
- Description:
- TVS DIODE 70VWM 146VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,889
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Product details
Overview
SM15T82AY 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/24 V vehicle systems. It features a nominal breakdown voltage of 82 V, clamping voltage of 113 V at 13.9 A (10/1000 µs), peak pulse power of 1500 W, and operates up to 150 °C junction temperature - deployed in engine control units and body electronics against load dump and ESD.
For engineers reviewing the SM15T82AY datasheet, SM15T82AY pinout, SM15T82AY application, or SM15T82AY equivalent, key selection criteria include unidirectional polarity, 82 V standoff rating, low leakage (0.2 µA @ 25 °C), AEC-Q101 qualification, and SMC package thermal performance under automotive surge conditions.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown characteristics across temperature and low leakage current - critical for long-term reliability in high-temperature automotive environments. Its dynamic resistance of 0.87 Ω enables precise clamping during fast transients like ISO 10605 ESD (±30 kV air/contact discharge).
The device meets ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) requirements for 12 V battery systems. Junction capacitance is 130 pF at 0 V (f = 1 MHz), confirming suitability for low-speed signal line protection without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 70–86 V (min–max at 25 °C, 1 mA test current); ensures reliable turn-on before system overvoltage damage |
| Clamping Voltage (VCL) | 113 V at 13.9 A (10/1000 µs); limits downstream voltage stress during ISO 7637-2 load dump events |
| Peak Pulse Power | 1500 W (10/1000 µs); sustains automotive surge energy without failure at Tj = 25 °C |
| Leakage Current (IRM) | 0.2 µA @ VRM = 67.2 V, 25 °C; minimizes standby power loss in always-on vehicle modules |
| Junction Temperature Range | −55 to +150 °C; supports under-hood placement in modern powertrain and ADAS ECUs |
| Dynamic Resistance (RD) | 0.87 Ω; determines voltage rise above VBR under surge current, enabling predictable clamping behavior |
| ESD Withstand | ±30 kV (IEC 61000-4-2, 150 pF/330 Ω & 330 pF/330 Ω); exceeds automotive OEM level-4 ESD immunity requirements |
Pinout & Package
SM15T82AY is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (marked side) and Anode. The package complies with JEDEC MO-136AC and IPC7531 footprint standards, featuring matte tin-plated leads rated for 260 °C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink node | Connected to protected line; conducts transient current to ground when reverse-biased beyond VBR |
| Anode | Reference/ground return path | Typically tied to chassis or system ground; completes clamping loop during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature, humidity, and mechanical shock per JESD22 standards |
| Low leakage at high temperature | 1 µA max @ 85 °C and VRM; preserves signal integrity and reduces quiescent current in always-on circuits |
| High-temperature power derating | 1250 W peak pulse capability at Tj = 150 °C; maintains protection margin in hot under-hood locations |
| Robust ESD and surge immunity | Exceeds ISO 10605 (±30 kV), IEC 61000-4-4 Level 4 (4 kV), and ISO 7637-2 Pulse 1–3b requirements |
| Planar silicon construction | Enables tight VBR tolerance and stable αT coefficient (10.5 × 10⁻⁴ /°C); ensures predictable clamping over life |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protects LIN bus and sensor inputs from load dump and alternator ripple in gasoline/diesel engine compartments. IC Role / Device Role / Timing Role: Unidirectional TVS placed between supply rail and ground to clamp transients before they reach MCU I/O or analog front-end. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V microcontrollers during ISO 7637-2 Pulse 1 (−150 V) events. |
Use Scenario: Shields door module CAN transceivers and window motor drivers from ESD and battery disconnection spikes. IC Role / Device Role / Timing Role: Standoff protection on 12 V input rail; activates only during surges >82 V, remaining invisible during normal operation. Use Value: Maintains <0.2 µA leakage at 25 °C, avoiding battery drain in parked vehicle mode over multi-year service life. |
| Advanced Driver Assistance Systems (ADAS) | Infotainment Power Supply |
|
Use Scenario: Safeguards radar sensor power rails against ignition noise and jump-start transients in front bumper mounting zones. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 5 V/3.3 V LDO input; coordinates with secondary TVS for multi-stage protection. Use Value: Clamps to 113 V within nanoseconds, limiting energy delivered to downstream regulators and preserving functional safety compliance. |
Use Scenario: Secures USB-C PD and display power inputs in head unit against hot-swap and cable ESD events. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor on 12 V main input; paired with ferrite bead for impedance matching. Use Value: Delivers ±30 kV ESD immunity per IEC 61000-4-2 while maintaining <130 pF capacitance to avoid USB signal jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A | Higher VBR (77–89 V), same SMC package, but lower peak power (400 W) and no AEC-Q101 certification | Limited to industrial/commercial use; unsuitable for automotive production due to missing qualification | Select only for non-automotive cost-sensitive designs where 400 W surge margin suffices |
| 1.5KE82A | Through-hole DO-201 package, 82 V VBR, 1500 W rating, but no AEC-Q101, higher leakage (5 µA), and larger footprint | Requires PCB rework for SMT lines; incompatible with automated assembly and high-density layouts | Use only for legacy through-hole designs or prototyping where SMC footprint is unavailable |
Compared with SMAJ85A and 1.5KE82A, SM15T82AY uniquely combines AEC-Q101 qualification, SMC surface-mount compatibility, 0.2 µA leakage, and full ISO 7637-2 compliance - making it the sole qualified choice for production automotive electronics requiring long-term reliability and zero rework risk.
Availability
SM15T82AY is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS sensors, and infotainment power supplies requiring stable component supply across automotive production lifecycles.
Supply support for SM15T82AY 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 ICs with vertical manufacturing and AEC-Q100/101 validation expertise.
SM15T82AY belongs to the SM15TY series - a family of planar TVS diodes engineered specifically for robust, high-temperature transient suppression in automotive electrical architectures compliant with ISO 7637 and ISO 10605.
FAQ
What is the maximum clamping voltage of SM15T82AY under a 10/1000 µs surge?
The maximum clamping voltage is 113 V at 13.9 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature at a rate defined by αT = 10.5 × 10⁻⁴ /°C, reaching ~122 V at Tj = 150 °C per datasheet calculation VCL(Tj) = VCL(25°C) × [1 + αT × (Tj − 25)].
Is SM15T82AY bidirectional or unidirectional?
SM15T82AY is unidirectional - it protects only against reverse-polarity transients on DC lines. Its cathode is marked on the package (MFRY marking), and it conducts only when the anode is negative relative to cathode. For bidirectional protection, ST offers SM15T82CAY with symmetrical clamping in both polarities.
Does SM15T82AY meet ISO 7637-2 Pulse 1 requirements?
Yes - SM15T82AY is explicitly rated for ISO 7637-2 Pulse 1 (−150 V, 50 ms, R = 2 Ω) in 12 V systems. Its 1500 W peak power rating and 113 V clamping voltage ensure the protected circuit sees less than 113 V during the pulse, well below typical 16 V–20 V IC absolute maximum ratings.
What is the thermal resistance junction-to-ambient for SM15T82AY on standard FR4 PCB?
On a recommended footprint (3.14 cm² copper area per lead), Rth(j-a) is 100 °C/W for single-pulse conditions. With 4.5 cm² total copper, it drops to ~65 °C/W. This enables sustained operation at 150 °C junction temperature when mounted on properly sized heatsink pads, as verified in Figure 12 of DS6928 Rev 6.
SM15T82AY 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 146V
- Current - Peak Pulse (10/1000µs):
- 69A (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
SM15T82AY FAQ
1.How can I place an order for SM15T82AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T82AY 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 SM15T82AY reliable?
The price and inventory of SM15T82AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T82AY is usually 5 days.
3.What payment methods are accepted for SM15T82AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T82AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T82AY?
SM15T82AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T82AY 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 SM15T82AY?
For technical support, including SM15T82AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T82AY requirements.
6.How does Aetrix verify that SM15T82AY is sourced from the original manufacturer or authorized distributors?
All SM15T82AY 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 SM15T82AY meets industry standards.
7.What is the process for return or replacement of SM15T82AY?
All SM15T82AY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T82AY, 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 SM15T82AY part is unused and in its original packaging.
Return procedure for SM15T82AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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