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STMicroelectronics SM15T75AY
- Part No.:
- SM15T75AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T75AY.pdf
- Description:
- TVS DIODE 64.1VWM 134VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,619
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Product details
Overview
SM15T75AY 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 75 V breakdown voltage (VBR = 75 V min), 103 V clamping voltage (VCL) at 14.6 A (8/20 µs), 1500 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM15T75AY datasheet, SM15T75AY pinout, SM15T75AY application, or SM15T75AY equivalent, key selection criteria include clamping performance at 14.6 A surge current, low leakage (<0.2 µA @ 25 °C), high junction temperature tolerance (Tj max = 150 °C), and compliance with ISO 10605 ±30 kV ESD and ISO 7637-2 Pulse 1/2a/3a/3b waveforms.
Technical Context
This TVS diode uses planar silicon technology to achieve stable VBR temperature coefficient (αT = 10.5 × 10−4/°C) and low dynamic resistance (RD = 0.74 Ω), enabling precise clamping under fast transients. Its unidirectional configuration provides forward conduction path only during negative surges, preserving signal integrity in DC-biased lines.
Rated for 1500 W (10/1000 µs) and 10 kW (8/20 µs) peak pulse power, it sustains up to 1250 W at Tj = 150 °C. The device meets IEC 61000-4-4 Level 4 (±4 kV), ISO 10605 (±30 kV), and ISO 7637-2 Pulse 1 (−150 V), 2a (+112 V), 3a (−220 V), 3b (+150 V) requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 64.1 V - Ensures reliable turn-on before system overvoltage damages downstream ICs |
| VCL @ IPP=14.6 A (8/20 µs) | 103 V - Limits transient voltage seen by protected circuit during worst-case surge |
| IR @ VRM=61.2 V | 0.2 µA @ 25 °C - Minimizes standby power loss and avoids false triggering in low-current sensors |
| PPP (10/1000 µs) | 1500 W - Handles sustained load-dump energy without thermal runaway |
| Tj max | 150 °C - Supports operation near engine control units and powertrain modules |
| Dynamic Resistance RD | 0.74 Ω - Reduces clamping voltage rise under increasing surge current |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with IPC7531 footprint compatibility |
Pinout & Package
The SM15T75AY is housed in an SMC (DO-214AB) package with two terminals: Cathode (K) and Anode (A). Matte tin-plated leads comply with J-STD-002 and MIL-STD-750 Method 2026 for solderability and whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | DC return / ground reference | Connected to system ground or chassis; defines unidirectional conduction direction |
| Cathode (K) | Protected line input | Connected to sensitive node (e.g., LIN bus, sensor supply); conducts during negative transients |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use across −55 °C to +150 °C junction temperature range |
| ISO 7637-2 Pulse 1/2a/3a/3b compliant | Withstands −150 V (Pulse 1), +112 V (Pulse 2a), −220 V (Pulse 3a), +150 V (Pulse 3b) without degradation |
| Low leakage current | 0.2 µA @ 25 °C and 1 µA @ 85 °C - preserves battery life in always-on vehicle modules |
| High surge robustness | 10 kW (8/20 µs) rating enables protection against lightning-induced coupling and alternator switching spikes |
| Planar junction construction | Delivers stable VBR drift (αT = 10.5 × 10−4/°C) and long-term reliability in thermally cycling environments |
Applications
| Engine Control Unit (ECU) Power Input | LIN Bus Node Protection |
|---|---|
Use Scenario: Protecting 12 V supply rail of engine control unit against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and LDO input to clamp negative-going pulses below −150 V (ISO 7637-2 Pulse 1). Use Value: Prevents latch-up or permanent damage to microcontroller power management circuitry during cold-cranking and battery disconnect events. |
Use Scenario: Safeguarding LIN transceiver pins against ESD and coupled noise in body electronics modules. IC Role / Device Role / Timing Role: TVS connected between LIN data line and ground to suppress ±30 kV contact discharge (ISO 10605) while maintaining <100 pF capacitance. Use Value: Ensures uninterrupted communication during assembly-line ESD events and prevents bit errors caused by transient-induced signal distortion. |
| Body Control Module (BCM) Sensor Inputs | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Shielding analog sensor inputs (e.g., ambient temperature, humidity) from board-level ESD and harness coupling. IC Role / Device Role / Timing Role: Low-leakage TVS (0.2 µA @ 25 °C) placed at ADC front-end to avoid DC offset shift while clamping transients to ≤103 V. Use Value: Maintains measurement accuracy in low-power sensor nodes without introducing bias error or calibration drift. |
Use Scenario: Protecting H-bridge gate driver supply rails from inductive kickback during EPS motor commutation. IC Role / Device Role / Timing Role: High-power TVS (1500 W, 10/1000 µs) mounted at motor driver IC VDD input to absorb repetitive 112 V positive pulses (ISO 7637-2 Pulse 2a). Use Value: Extends gate driver lifetime by limiting voltage overshoot that would otherwise degrade oxide layers or cause premature failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A | Lower peak pulse power (400 W vs. 1500 W), higher VCL (123 V @ 12.2 A), no AEC-Q101 qualification | Not suitable for ISO 7637-2 Pulse 1 or load-dump scenarios; limited to consumer-grade ESD-only protection | Select only for cost-sensitive non-automotive designs where surge energy is <400 W |
| 1.5KE75A | Through-hole DO-201 package, higher VCL (129 V @ 11.6 A), no automotive qualification, lower thermal dissipation capability | Cannot meet SMT production requirements or AEC-Q101 vibration/shock testing; incompatible with automated assembly | Use only for prototyping or legacy through-hole boards lacking reflow capability |
Compared with SMAJ75A and 1.5KE75A, SM15T75AY delivers 3.75× higher surge power handling, 20–26 V lower clamping voltage at rated current, and full AEC-Q101 validation-making it the sole choice for production automotive ECUs requiring ISO 7637-2 compliance and SMT manufacturability.
Availability
SM15T75AY is available at Aetrix Electronics and suitable for engine control units, LIN bus nodes, body control modules, and electric power steering systems requiring stable component supply across automotive production lifecycles.
Supply support for SM15T75AY 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 discrete technologies with over 40 years of automotive qualification expertise.
The SM15TxxAY series belongs to ST's automotive TVS portfolio, engineered specifically for robust transient suppression in 12 V/24 V vehicle networks-targeting ECU, BCM, ADAS, and electrification subsystems demanding AEC-Q101 reliability and ISO 7637-2 immunity.
FAQ
What is the maximum clamping voltage of SM15T75AY under an 8/20 µs surge?
The SM15T75AY clamps to 103 V when subjected to a 14.6 A 8/20 µs surge current, as specified in Table 2 of DS6928 Rev 6. This value is measured at Tamb = 25 °C and represents the peak voltage across the device during standardized transient testing, ensuring downstream components remain within safe operating limits.
Does SM15T75AY support bidirectional transient suppression?
No, SM15T75AY is a unidirectional TVS diode, meaning it conducts only during reverse-bias (cathode-positive) transients. For bidirectional protection, ST offers the SM15T75CAY variant, which provides symmetrical clamping for both polarities and is marked "BFOY" per Table 6 of the datasheet.
How does the 10.5 × 10⁻⁴/°C temperature coefficient affect breakdown voltage?
The αT = 10.5 × 10−4/°C coefficient means VBR increases by 0.079 V/°C above 25 °C. At Tj = 150 °C, VBR rises to ~71.3 V (per Table 2), ensuring consistent turn-on margin across the full automotive temperature range without premature conduction.
Is SM15T75AY compatible with lead-free reflow soldering processes?
Yes, SM15T75AY supports lead-free reflow per ST's recommended profile (Figure 25, DS6928 Rev 6): peak temperature 240–245 °C for 60–90 seconds, ramp rates ≤3 °C/s, and cooling rate ≥−2 °C/s. Its matte tin plating complies with J-STD-020 MSL Level 1 and passes JESD 22-B102 E3 solderability testing.
SM15T75AY 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):
- 64.1V
- Voltage - Breakdown (Min):
- 71.3V
- Voltage - Clamping (Max) @ Ipp:
- 134V
- Current - Peak Pulse (10/1000µs):
- 75A (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
SM15T75AY FAQ
1.How can I place an order for SM15T75AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T75AY 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 SM15T75AY reliable?
The price and inventory of SM15T75AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T75AY is usually 5 days.
3.What payment methods are accepted for SM15T75AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T75AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T75AY?
SM15T75AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T75AY 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 SM15T75AY?
For technical support, including SM15T75AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T75AY requirements.
6.How does Aetrix verify that SM15T75AY is sourced from the original manufacturer or authorized distributors?
All SM15T75AY 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 SM15T75AY meets industry standards.
7.What is the process for return or replacement of SM15T75AY?
All SM15T75AY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T75AY, 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 SM15T75AY part is unused and in its original packaging.
Return procedure for SM15T75AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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