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STMicroelectronics SM15T36AY
- Part No.:
- SM15T36AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T36AY.pdf
- Description:
- TVS DIODE 30.8VWM 64.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:1,552
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Product details
Overview
SM15T36AY 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 battery systems. It features a 36 V nominal breakdown voltage (VBR = 30.8–37.8 V), 49.9 V clamping voltage at 30 A (8/20 µs), 1500 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for under-hood electronics.
For engineers reviewing the SM15T36AY datasheet, SM15T36AY pinout, SM15T36AY application, or SM15T36AY equivalent, key selection criteria include clamping performance at 30 A, low leakage (<0.2 µA @ 25 °C), junction temperature capability up to +150 °C, and compliance with ISO 10605 (±30 kV ESD) and ISO 7637-2 (Pulse 1/2a/3a/3b).
Technical Context
This TVS operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (30.8–37.8 V at 25 °C), clamping transients to ≤49.9 V at 30 A (8/20 µs). Its planar silicon construction ensures stable leakage (<1 µA @ 85 °C) and high thermal robustness up to Tj = +150 °C.
The device meets stringent automotive surge standards: ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V), with dynamic resistance of 0.403 Ω enabling fast, predictable clamping response during high-current transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 30.8 / 34.2 / 37.8 V - Ensures reliable turn-on above system operating voltage while avoiding false triggering during load dump or cranking. |
| VCL @ 30 A (8/20 µs) | 49.9 V - Limits downstream IC voltage stress during worst-case ISO 7637-2 Pulse 3a (−220 V) events. |
| PPP (10/1000 µs) | 1500 W - Sustains high-energy surges without degradation in engine control units and body electronics. |
| IRM @ VRM | 0.2 µA max @ 29.2 V - Minimizes standby current loss in always-on automotive modules. |
| Tj max | +150 °C - Enables placement near heat sources (e.g., powertrain ECUs) without derating. |
| Dynamic Resistance (RD) | 0.403 Ω - Provides tight clamping window and predictable voltage overshoot during fast transients. |
| ESD Rating (IEC 61000-4-2) | ±30 kV contact/air - Exceeds Level 4 for infotainment and ADAS sensor interfaces. |
Pinout & Package
SM15T36AY is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (marked side) and Anode. The matte tin-plated leads comply with J-STD-002 and support lead-free reflow per JEDEC J-STD-020 MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink | Connected to protected line (e.g., LIN bus, CAN shield); conducts transient energy to ground during overvoltage. |
| Anode | Reference node | Typically tied to system ground or low-impedance return path; establishes unidirectional conduction direction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use across −40 °C to +150 °C junction temperature range. |
| Low leakage current | ≤0.2 µA @ 25 °C and ≤1 µA @ 85 °C - Preserves battery life in always-on vehicle networks. |
| High-power clamping | 1500 W (10/1000 µs) and 10 kW (8/20 µs) - Handles combined load dump and ESD events without failure. |
| ISO 7637-2 compliance | Rated for Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), Pulse 3b (+150 V) - Covers full automotive surge profile. |
| Planar silicon technology | Enables stable VBR temperature coefficient (αT = 9.9 × 10−4/°C) and long-term reliability in high-Tj environments. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting 12 V supply input against load dump and alternator transients during engine start-stop cycles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input to clamp voltage spikes before they reach power management ICs. Use Value: Prevents latch-up or permanent damage to microcontrollers and analog front-ends during ISO 7637-2 Pulse 1 (−150 V) and Pulse 3b (+150 V) events. |
Use Scenario: Safeguarding LIN bus transceivers from ESD and coupled noise in door module wiring harnesses. IC Role / Device Role / Timing Role: TVS connected between LIN signal line and ground to shunt ±30 kV ESD strikes per IEC 61000-4-2. Use Value: Maintains LIN communication integrity without signal distortion, thanks to low capacitance (<100 pF @ 0 V) and sub-50 V clamping. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Input | Infotainment Head Unit USB Power Rail |
|
Use Scenario: Shielding 12 V camera power input from ignition-induced transients and hot-swap surges in rear-view camera systems. IC Role / Device Role / Timing Role: Primary surge protector on main power feed, upstream of DC-DC converter, rated for 1500 W (10/1000 µs). Use Value: Ensures continuous operation during ISO 7637-2 Pulse 2a (+112 V) and Pulse 3a (−220 V), preventing image dropout or sensor reset. |
Use Scenario: Protecting 5 V USB VBUS line from conducted transients originating from vehicle battery fluctuations. IC Role / Device Role / Timing Role: Secondary TVS stage after primary 12 V protection, clamping induced surges to <5 V tolerance of USB PHY. Use Value: Achieves <1 µs response time and ≤0.4 Ω RD to limit overshoot below 5.5 V, preserving USB enumeration 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 |
|---|---|---|---|
| SMAJ36A | Lower PPP (400 W), higher VCL (58.1 V @ 6.9 A), non-AEC-Q101 | Not qualified for automotive under-hood use; suitable only for industrial or consumer-grade 12 V inputs. | Select SMAJ36A only if AEC-Q101 is not required and surge energy is limited to <400 W. |
| 1.5KE36A | Through-hole DO-201 package, 1500 W rating but no ISO 7637-2 validation, higher leakage (5 µA) | Lacks automotive qualification and footprint compatibility; requires PCB redesign and lacks ESD robustness. | Choose 1.5KE36A only for legacy through-hole designs where rework is acceptable and ESD immunity is secondary. |
Compared with SMAJ36A and 1.5KE36A, SM15T36AY delivers automotive-grade reliability, lower clamping voltage, and superior ESD immunity - critical for modern ECU, BCM, and ADAS power rail protection where space, thermal margin, and qualification are non-negotiable.
Availability
SM15T36AY is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera power inputs, and infotainment USB rails requiring stable component supply across automotive production lifecycles.
Supply support for SM15T36AY 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 specializing in automotive, industrial, and power management solutions, with over 45 years of innovation in protection devices and microelectronics.
The SM15TxxAY series belongs to ST's automotive TVS portfolio, engineered specifically for ISO 7637-2 and ISO 10605 compliance in harsh-temperature vehicle environments - targeting ECU, BCM, and ADAS subsystems.
FAQ
What is the maximum clamping voltage of SM15T36AY under ISO 7637-2 Pulse 3a conditions?
Under ISO 7637-2 Pulse 3a (−220 V, 50 Ω source impedance), SM15T36AY clamps to ≤49.9 V at 30 A (8/20 µs waveform), verified per DS6928 Rev 6 test data. This ensures downstream 5 V or 3.3 V logic remains within safe operating limits during worst-case negative transients.
Does SM15T36AY require derating at elevated ambient temperatures?
Yes - its peak pulse power decreases linearly with junction temperature: at Tj = +125 °C, PPP drops to ~1250 W (10/1000 µs), per Figure 3 in DS6928. Designers must calculate actual Tj using Rth(j-a) (from Figure 12) and ensure copper area ≥3.5 cm² per lead for full 1500 W rating.
Can SM15T36AY be used in bidirectional configurations?
No - SM15T36AY is unidirectional (anode-cathode polarity). For bidirectional protection, ST offers SM15T36CAY, which has symmetrical clamping in both directions and identical VBR and VCL specs. Mixing types risks incorrect surge routing and device failure.
What is the recommended PCB footprint for optimal thermal performance?
The recommended footprint (Figure 18, DS6928) specifies 5.11 mm × 8.19 mm pad layout with 3.14 mm spacing and ≥3.5 cm² total copper area under both leads. This achieves Rth(j-a) ≈ 40 °C/W, enabling full 1500 W rating at Tamb = +85 °C per JEDEC J-STD-020 reflow profile.
SM15T36AY 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):
- 30.8V
- Voltage - Breakdown (Min):
- 34.2V
- Voltage - Clamping (Max) @ Ipp:
- 64.3V
- Current - Peak Pulse (10/1000µs):
- 156A (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
SM15T36AY FAQ
1.How can I place an order for SM15T36AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T36AY 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 SM15T36AY reliable?
The price and inventory of SM15T36AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T36AY is usually 5 days.
3.What payment methods are accepted for SM15T36AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T36AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T36AY?
SM15T36AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T36AY 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 SM15T36AY?
For technical support, including SM15T36AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T36AY requirements.
6.How does Aetrix verify that SM15T36AY is sourced from the original manufacturer or authorized distributors?
All SM15T36AY 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 SM15T36AY meets industry standards.
7.What is the process for return or replacement of SM15T36AY?
All SM15T36AY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T36AY, 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 SM15T36AY part is unused and in its original packaging.
Return procedure for SM15T36AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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