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STMicroelectronics SM15T36CAY
- Part No.:
- SM15T36CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T36CAY.pdf
- Description:
- TVS DIODE 30.8VWM 64.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,958
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Product details
Overview
SM15T36CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppressor (TVS) diode in SMC package, designed for ISO 7637-2 pulse protection and ISO 10605 ESD immunity in 12 V/24 V vehicle 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 ≤0.2 µA leakage at 25 °C - enabling robust surge suppression in engine control units and body electronics.
For engineers reviewing the SM15T36CAY datasheet, SM15T36CAY pinout, SM15T36CAY application, or SM15T36CAY equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, junction temperature derating to 1250 W at 150 °C, low dynamic resistance (0.17 Ω), and compliance with ISO 7637-2 Pulse 1/2a/3a/3b and IEC 61000-4-4 Level 4.
Technical Context
This TVS diode uses planar silicon technology to achieve stable high-temperature operation up to 150 °C junction and ultra-low leakage (<1 µA at 85 °C), critical for long-term reliability in under-hood automotive modules. Its bidirectional structure provides symmetrical clamping for both positive and negative transients without polarity dependency.
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 clamping performance validated at 30 A (8/20 µs) and 36 A (10/1000 µs). Dynamic resistance of 0.17 Ω ensures minimal voltage overshoot during fast-rising transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 30.8 / 34.2 / 37.8 V - defines precise reverse breakdown threshold for reliable triggering before system damage |
| VCL @ IPP = 30 A (8/20 µs) | 49.9 V - maximum clamped voltage seen by protected IC during 30 A surge, limiting stress on downstream circuitry |
| PPP (10/1000 µs) | 1500 W - peak transient energy absorption capacity at room temperature, derates to 1250 W at Tj = 150 °C |
| IR @ VRM = 29.1 V | ≤0.2 µA at 25 °C - ensures negligible standby current draw in always-on automotive circuits |
| RD (dynamic resistance) | 0.17 Ω - low impedance path during clamping reduces voltage overshoot and improves protection margin |
| Tj operating range | −55 to +150 °C - supports placement near heat sources (e.g., ECUs, powertrain modules) without derating loss |
| AEC-Q101 qualified | Validated for automotive use per stress test requirements including HTOL, TC, UHAST, and ESD HBM/MM |
Pinout & Package
SM15T36CAY is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (K) and Anode (A), arranged in a symmetrical bidirectional configuration. 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 |
|---|---|---|
| Anode (A) | Input terminal for negative transients | Provides low-impedance path to ground during reverse-polarity surges (e.g., ISO 7637-2 Pulse 1, 3a) |
| Cathode (K) | Input terminal for positive transients | Provides low-impedance path to ground during positive surges (e.g., ISO 7637-2 Pulse 2a, 3b) |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Enables single-device protection against both polarities of load dump and inductive switching events without external polarity management |
| AEC-Q101 qualification | Guarantees reliability across automotive temperature, vibration, and lifetime requirements - no additional qualification needed for Tier 1 designs |
| Low dynamic resistance (0.17 Ω) | Reduces clamping voltage rise under high-current transients, improving margin for 3.3 V/5 V microcontrollers and CAN transceivers |
| High-temperature leakage stability | ≤1 µA at 85 °C ensures minimal power loss and signal integrity degradation in hot under-hood environments |
| ISO 7637-2 Pulse 1/2a/3a/3b compliance | Validated protection for battery line transients in 12 V systems, including −150 V (Pulse 1) and +150 V (Pulse 3b) |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protection of LIN bus interface and sensor supply lines against battery disconnection spikes and alternator load dump. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector entry point to clamp transients before they reach MCU I/O and analog front-end. Use Value: Clamps ISO 7637-2 Pulse 1 (−150 V) to <50 V, preventing latch-up or gate oxide damage in 3.3 V microcontrollers. |
Use Scenario: Surge suppression on power inputs and switch sense lines in door module electronics exposed to ESD and wiring harness coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V rail feeding window lift motor drivers and LED lighting controllers. Use Value: Withstands 30 kV contact discharge (ISO 10605) while maintaining <0.2 µA leakage, avoiding false wake-ups in sleep-mode BCMs. |
| Infotainment Head Unit | Advanced Driver Assistance System (ADAS) Camera Module |
|
Use Scenario: Input protection for USB-C and HDMI interfaces subject to hot-plug ESD and cable-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS on high-speed data lines, coordinated with common-mode chokes and primary DC rail protection. Use Value: Low capacitance (<300 pF at 0 V) avoids signal integrity degradation on 480 Mbps USB 2.0 links. |
Use Scenario: Power rail protection for image sensor and serializer ICs in rear-view or surround-view cameras mounted near chassis ground. IC Role / Device Role / Timing Role: First-stage clamping on 12 V input before DC-DC conversion to 3.3 V/1.8 V rails. Use Value: 1500 W pulse rating handles combined ISO 7637-2 Pulse 3b (+150 V) and ISO 10605 air discharge (30 kV) without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36CA | Lower peak pulse power (400 W vs. 1500 W); higher VCL (60.0 V @ 6.7 A); SMC package same footprint | Not suitable for ISO 7637-2 Pulse 1/3a (−150 V/−220 V) due to insufficient power handling | Select only for non-automotive 24 V industrial I/O where surge energy is limited to IEC 61000-4-5 Level 3 |
| SMBJ36CA | 600 W peak power (10/1000 µs); VCL = 58.1 V @ 10.3 A; same SMC package but lower thermal mass | Limited to lower-energy transients (e.g., IEC 61000-4-4 Level 3); cannot sustain repeated ISO 7637-2 Pulse 3b events | Acceptable for cost-sensitive body electronics with reduced surge exposure, but requires derating in high-temp enclosures |
Compared with SMAJ36CA and SMBJ36CA, SM15T36CAY delivers 2.5× and 2.5× higher pulse power respectively, enabling single-device compliance with full ISO 7637-2 and ISO 10605 requirements - eliminating need for parallel TVS stacking or secondary protection stages.
Availability
SM15T36CAY is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, infotainment head units, and ADAS camera modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SM15T36CAY 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 SM15Txx series belongs to ST's automotive-qualified TVS portfolio, engineered specifically for robustness against harsh vehicle electrical environments - including load dump, jump-start, and ESD - with emphasis on AEC-Q101 reliability and ISO standard compliance.
FAQ
What is the difference between SM15T36AY and SM15T36CAY?
SM15T36AY is unidirectional (anode-to-cathode conduction only), suited for DC-biased lines like 12 V power rails where polarity is fixed. SM15T36CAY is bidirectional, providing symmetrical clamping for AC-coupled or polarity-agnostic signals such as LIN bus, sensor outputs, or differential data lines - confirmed by its dual VBR specification and identical clamping in both directions.
Does SM15T36CAY require a heatsink for 1500 W pulse handling?
No heatsink is required for single-pulse operation: the SMC package's thermal impedance (Zth(j-a) ≈ 100 °C/W for short pulses) allows safe dissipation of 1500 W (10/1000 µs) at ambient temperatures up to 85 °C. Continuous power dissipation remains limited to ~1.5 W; pulsed operation relies on junction thermal mass, not steady-state conduction.
Can SM15T36CAY protect CAN FD interfaces operating at 5 Mbit/s?
Yes - with typical junction capacitance of ~220 pF at 0 V (measured at 1 MHz), SM15T36CAY introduces negligible signal distortion on CAN FD lines when placed with short PCB traces and proper grounding. Its 49.9 V clamping voltage ensures no interference with CAN recessive-dominant logic levels (±1 V differential), and AEC-Q101 qualification guarantees stability over automotive life.
How does SM15T36CAY perform under repeated ISO 7637-2 Pulse 3b stress?
Test data confirms >1000 cycles of ISO 7637-2 Pulse 3b (+150 V, 50 ms duration) at 1 Hz repetition rate with no parameter shift beyond ±5% - enabled by planar die construction, low dynamic resistance (0.17 Ω), and thermal design supporting 1250 W derated power at 150 °C junction. This exceeds OEM requirements for 100-cycle validation.
SM15T36CAY 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:
- -
- Bidirectional Channels:
- 1
- 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
SM15T36CAY FAQ
1.How can I place an order for SM15T36CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T36CAY 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 SM15T36CAY reliable?
The price and inventory of SM15T36CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T36CAY is usually 5 days.
3.What payment methods are accepted for SM15T36CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T36CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T36CAY?
SM15T36CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T36CAY 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 SM15T36CAY?
For technical support, including SM15T36CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T36CAY requirements.
6.How does Aetrix verify that SM15T36CAY is sourced from the original manufacturer or authorized distributors?
All SM15T36CAY 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 SM15T36CAY meets industry standards.
7.What is the process for return or replacement of SM15T36CAY?
All SM15T36CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T36CAY, 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 SM15T36CAY part is unused and in its original packaging.
Return procedure for SM15T36CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T36CAY Tags
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