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STMicroelectronics SM50T15AY
- Part No.:
- SM50T15AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM50T15AY.pdf
- Description:
- AUTOMOTIVE 5000 W, 13 V TVS IN S
- Quantity:
- Payment:
- Shipping:
Inventory:2,490
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Product details
Overview
SM50T15AY from STMicroelectronics is a unidirectional automotive-grade transient voltage suppression (TVS) diode in SMC package, designed for ISO 7637-2 pulse protection in 12 V automotive systems. It features a 15 V breakdown voltage (VBR = 14.4–16.0 V), 21.5 V clamping voltage at 233 A (8/20 µs), 5000 W peak pulse power (10/1000 µs), and ≤0.2 µA leakage at 25 °C - deployed in e-brake control modules to suppress load dump and switching transients.
For engineers reviewing the SM50T15AY datasheet, SM50T15AY pinout, SM50T15AY application, or SM50T15AY equivalent, this page delivers verified electrical specs, AEC-Q101 qualification evidence, SMC package mechanical data, ISO 10605/7637-2 compliance metrics, and direct design guidance for automotive circuit protection layout and thermal management.
Technical Context
This TVS diode uses planar silicon technology to achieve low leakage (<0.2 µA at 25 °C) and high junction temperature tolerance (Tj up to +175 °C), enabling long-term reliability in under-hood environments. Its unidirectional configuration provides forward conduction only during negative transients, with cathode-bar marking for polarity identification.
The device 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 - validated via standardized test waveforms and dynamic resistance (RD = 9.13 mΩ) derived from VCL–IPP linearity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 14.4 / 15.2 / 16.0 V - ensures reliable turn-on before downstream IC damage in 12 V battery systems |
| VCL @ 233 A (8/20 µs) | 23.6 V - clamps surge energy below safe threshold for MCU I/O and sensor interfaces |
| IPP (8/20 µs) | 27.2 A - supports robust handling of fast, high-current ESD and inductive kick events |
| RD (dynamic resistance) | 9.13 mΩ - minimizes voltage overshoot during high di/dt transients |
| IR @ VRM | ≤0.2 µA at 25 °C - prevents signal integrity loss and battery drain in always-on circuits |
| Tj operating range | −55 to +175 °C - qualified for engine bay placement without derating |
| AEC-Q101 status | Qualified - certified for automotive safety-critical applications per stress test protocol |
Pinout & Package
SM50T15AY is housed in an industry-standard SMC (DO-214AB) surface-mount package with JEDEC-registered outline, matte tin lead finish, and MSL Level 1 moisture sensitivity rating. The package measures 5.55–6.25 mm × 7.75–8.15 mm × 2.45 mm max height, optimized for FR4 PCBs with 70 µm copper thickness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or chassis return path; enables unidirectional clamping of negative transients |
| Cathode | Protected line input | Connected to protected line (e.g., brake switch signal); marked with cathode bar on top surface |
Key Features
| Feature | Design Value |
|---|---|
| Planar silicon construction | Enables stable VBR drift <10⁻⁴/°C and low leakage across −55 to +175 °C |
| ISO 7637-2 Pulse 1/2a/3a/3b compliance | Validated clamping response to −150 V, +112 V, −220 V, and +150 V transients in 12 V systems |
| IEC 61000-4-2 & ISO 10605 ESD immunity | Withstands ±30 kV contact/air discharge without parametric shift or failure |
| Thermal impedance (Zth(j-a)) | 100 °C/W (single pulse, recommended footprint) - enables compact layout without heatsinking |
| UL94 V0 flammability rating | Ensures non-propagation of flame during overvoltage fault conditions |
Applications
| Brake Control Module | Body Control Unit (BCU) |
|---|---|
|
Use Scenario: Protecting brake switch signal lines from load dump and alternator ripple in 12 V systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between switch input and MCU GPIO to clamp negative transients before they reach logic-level inputs. Use Value: Prevents false triggering or latch-up in brake status monitoring circuits during ISO 7637-2 Pulse 1 (−150 V) events. |
Use Scenario: Safeguarding LIN bus transceiver power rails against battery disconnection surges. IC Role / Device Role / Timing Role: TVS connected between VCC and GND of LIN PHY to absorb Pulse 3b (+150 V) energy within 100 ns. Use Value: Maintains LIN communication integrity during ignition cycling by limiting rail voltage excursion to 23.6 V. |
| Electronic Parking Brake (EPB) | Power Distribution Module |
|
Use Scenario: Shielding motor driver enable signals from inductive kickback during EPB actuator de-energization. IC Role / Device Role / Timing Role: Fast-response TVS placed at gate driver input to suppress 8/20 µs spikes exceeding 27 A. Use Value: Eliminates MCU reset caused by transient-induced noise coupling into enable logic paths. |
Use Scenario: Protecting fuse box microcontroller supply pins from reverse battery connection transients. IC Role / Device Role / Timing Role: Unidirectional TVS installed on 5 V regulator input to clamp reverse polarity surges per ISO 16750-2 Test B. Use Value: Ensures continuous operation of diagnostic firmware during vehicle jump-start scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15A | VBR = 16.7–18.5 V; VCL = 24.4 V @ 205 A; RD = 12.8 mΩ; same SMC package | Higher clamping voltage increases risk of overvoltage stress on 3.3 V MCU I/O | Prefer SM50T15AY where VCL margin <1 V is required for 15 V rail protection |
| 1.5KE15A | Through-hole DO-201 package; VBR = 14.3–15.8 V; VCL = 22.5 V @ 222 A; Tj max = +175 °C | Not AEC-Q101 qualified; unsuitable for automotive production due to lack of automotive stress testing | Select SM50T15AY for OEM programs requiring full automotive qualification and surface-mount assembly compatibility |
Compared with SMBJ15A and 1.5KE15A, SM50T15AY delivers lower clamping voltage (23.6 V vs. ≥24.4 V), tighter VBR tolerance (±6.7% vs. ±10%), and mandatory AEC-Q101 validation - making it the only choice for functional-safety-relevant brake and power distribution circuits.
Availability
SM50T15AY is available at Aetrix Electronics and suitable for automotive brake control modules, body control units, electronic parking brake systems, and power distribution modules requiring stable component supply across multi-year vehicle production cycles.
Supply support for SM50T15AY 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 solutions with vertical manufacturing capabilities.
The SM50TxxAY series belongs to ST's automotive-grade TVS portfolio, engineered specifically to meet stringent ISO 7637-2, ISO 10605, and AEC-Q101 requirements for under-hood and chassis-mounted electronics protection.
FAQ
What is the maximum clamping voltage of SM50T15AY under an 8/20 µs surge?
The maximum clamping voltage (VCL) is 23.6 V at 27.2 A for an 8/20 µs waveform, measured at Tj = 25 °C. This value increases linearly with junction temperature using αT = 9.13 × 10⁻⁴/°C, reaching ~25.1 V at Tj = 125 °C per the datasheet's VCL vs. Tj formula.
Is SM50T15AY compatible with lead-free reflow soldering processes?
Yes - SM50T15AY is qualified for lead-free reflow per J-STD-020 MSL Level 1, with a peak profile of 240–245 °C for 2–3 seconds. The matte tin plating and SMC package withstand thermal cycling without delamination or solder joint fracture when following ST's recommended reflow curve (DS13895 Fig. 31).
How does SM50T15AY differ from bidirectional SM50T15CAY in circuit implementation?
SM50T15AY is unidirectional and must be oriented with cathode toward the protected line to clamp negative transients only; SM50T15CAY is bidirectional and clamps both polarities symmetrically. The unidirectional version offers lower leakage (0.2 µA vs. 1 µA) and is preferred for DC-biased signal lines like brake switch inputs.
Can SM50T15AY protect against load dump events defined in ISO 16750-2?
Yes - SM50T15AY is explicitly validated for ISO 16750-2 Test B (load dump with Ri = 1 Ω, Us = 87 V, td = 150/400 ms). Its 5000 W 10/1000 µs rating and 175 °C Tj max ensure survival and parametric stability during sustained overvoltage conditions typical of alternator regulation failure.
SM50T15AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 13V (Max)
- Voltage - Breakdown (Min):
- 14.4V
- Voltage - Clamping (Max) @ Ipp:
- 21.5V
- Current - Peak Pulse (10/1000µs):
- 233A
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SM50T15AY FAQ
1.How can I place an order for SM50T15AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM50T15AY 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 SM50T15AY reliable?
The price and inventory of SM50T15AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM50T15AY is usually 5 days.
3.What payment methods are accepted for SM50T15AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM50T15AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM50T15AY?
SM50T15AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM50T15AY 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 SM50T15AY?
For technical support, including SM50T15AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM50T15AY requirements.
6.How does Aetrix verify that SM50T15AY is sourced from the original manufacturer or authorized distributors?
All SM50T15AY 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 SM50T15AY meets industry standards.
7.What is the process for return or replacement of SM50T15AY?
All SM50T15AY units undergo pre-shipment inspection (PSI). If there is an issue with SM50T15AY, 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 SM50T15AY part is unused and in its original packaging.
Return procedure for SM50T15AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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