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Vishay General Semiconductor - Diodes Division SM15T12A-M3/9AT
- Part No.:
- SM15T12A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T12A-M3/9AT.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,482
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Product details
Overview
SM15T12A-M3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 12 V standoff voltage (VWM = 10.2 V), and clamping voltage of 16.7 V at 90 A IPPM. It protects MOSFETs and signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SM15T12A-M3/9AT datasheet, SM15T12A-M3/9AT pinout, SM15T12A-M3/9AT application, or SM15T12A-M3/9AT equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, unidirectional polarity alignment with DC bias, thermal resistance (RθJA = 75 °C/W), and halogen-free RoHS compliance per M3 suffix.
Technical Context
This TVS operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<5 μA leakage at 10.2 V), but avalanches rapidly when reverse voltage exceeds 11.4 V (min VBR), limiting transient energy via low-inductance silicon junction. Its glass-passivated chip ensures stable breakdown and robust surge handling.
Designed for surface-mount placement on 8.0 mm × 8.0 mm copper pads, the device sustains 200 A non-repetitive forward surge (10 ms half-sine) and operates from –65 °C to +150 °C junction temperature. Failure mode under overstress is short-circuit, consistent with industrial safety requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10.2 V - Maximum continuous reverse operating voltage before leakage exceeds 5 μA; sets upper limit for protected line DC bias. |
| VBR (min/max) | 11.4 V / 12.6 V at 1.0 mA - Confirmed avalanche initiation range; ensures reliable turn-on before downstream IC damage threshold. |
| VC @ IPPM | 16.7 V at 90 A (10/1000 μs) - Clamped voltage during worst-case lightning-induced surge; must stay below protected device's absolute max rating. |
| PPPM | 1500 W - Peak transient power dissipation capability; validates suitability for IEC 61000-4-5 Level 4 (4 kV) threat environments. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard pad layout; determines required board copper area for sustained 6.5 W power dissipation. |
| Polarity | Unidirectional - Cathode marked by band; requires correct orientation relative to DC rail polarity to avoid forward conduction during normal operation. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, MSL level 1 (260 °C reflow peak). Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); cathode identified by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes current path during transient clamp event. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V supply or sensor output); polarity marking ensures correct installation. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Validates protection against severe lightning-induced surges per IEC 61000-4-5, without requiring external series impedance. |
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature, minimizing drift in clamping performance across automotive (-40 °C to +125 °C ambient) use cases. |
| Low inductance design | Reduces voltage overshoot during fast-rising transients (e.g., <100 ns edges), critical for protecting high-speed sensor interfaces. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU Directive 2015/863 for restricted substances in industrial and automotive production. |
Applications
| Automotive Sensor Protection | Industrial Motor Drive I/O |
|---|---|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine control modules exposed to load-dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between signal line and chassis ground, clamping transients within 1 ns response time. Use Value: Prevents latch-up or gate oxide rupture in 12 V–rated sensor interface ICs by limiting voltage to ≤16.7 V during 90 A surge events. | Use Scenario: Safeguarding PLC analog input channels connected to 4–20 mA current loops driving solenoids and relays. IC Role / Device Role / Timing Role: Standoff-rated TVS on terminal block side of isolation barrier, absorbing 1500 W switching spikes from coil de-energization. Use Value: Eliminates need for external RC snubbers while maintaining signal integrity due to low junction capacitance (<100 pF at 0 V). |
| Consumer Power Adapter Input | Telecom Line Interface |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters powering USB-C PD controllers and PMICs. IC Role / Device Role / Timing Role: Unidirectional clamp on 12 V DC output rail, coordinated with upstream MOV and fuse for staged surge defense. Use Value: Provides precise 10.2 V hold-off to avoid false triggering during brownout recovery, while clamping to 16.7 V during surge. | Use Scenario: Protecting Ethernet PHY front-end ESD diodes and magnetics from induced surges on PoE-powered devices. IC Role / Device Role / Timing Role: Primary-level TVS on DC bias line feeding active Ethernet magnetics, placed before common-mode choke. Use Value: Withstands repeated 10/1000 μs transients up to 90 A without degradation, verified per AEC-Q101 stress testing protocols. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | 600 W PPPM, SMA package, higher RθJA (100 °C/W), same VWM (10.2 V) and VC (19.9 V @ 30 A) | Limited to lower-energy threats (IEC 61000-4-5 Level 2); unsuitable for 1500 W lightning surges | Select SMAJ12A only if board space is constrained and threat level is ≤600 W. |
| SMCJ12A | Identical 1500 W PPPM and SMC package, but E3 suffix (non-halogen-free); VBR min 11.4 V, VC 16.7 V @ 90 A - matches SM15T12A-M3/9AT electrically | No functional difference in protection performance; differs only in material compliance (halogen content) | Choose SMCJ12A-E3/9AT if halogen-free requirement is not mandated by end-equipment specification. |
Compared with SMAJ12A and SMCJ12A, SM15T12A-M3/9AT delivers identical 1500 W surge capability and clamping performance in an M3-compliant package, enabling direct substitution where halogen-free materials are required without sacrificing thermal or electrical performance.
Availability
SM15T12A-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial motor drive I/O protection, and telecom line interface designs requiring stable component supply with full halogen-free compliance and AEC-Q101 traceability.
Supply support for SM15T12A-M3/9AT 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SM15T Series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where 1500 W surge immunity and AEC-Q101 qualification are mandatory.
FAQ
What is the clamping voltage of SM15T12A-M3/9AT at its rated peak pulse current?
The SM15T12A-M3/9AT has a maximum clamping voltage (VC) of 16.7 V when subjected to its rated peak pulse current (IPPM) of 90 A using the standardized 10/1000 μs waveform. This value is measured under specified test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on the protected circuit during surge events. The SM15T12A-M3/9AT maintains this clamping performance consistently across its operational temperature range.
Is SM15T12A-M3/9AT suitable for automotive applications?
Yes, SM15T12A-M3/9AT is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes (e.g., SM15T12AHM3_A/I). While the M3/9AT variant itself is commercial-grade and halogen-free, it shares identical electrical and thermal characteristics with the AEC-Q101 versions. For automotive use, specify the HM3 suffix with appropriate revision code; the SM15T12A-M3/9AT serves as the baseline for qualification and is widely deployed in non-safety-critical automotive sensor modules.
How does the M3 suffix affect the environmental compliance of SM15T12A-M3/9AT?
The M3 suffix on SM15T12A-M3/9AT indicates halogen-free, RoHS-compliant construction per JESD201 Class 2 whisker testing and IPC-1752A material declarations. Unlike E3 variants, M3 devices contain no brominated flame retardants or chlorine-based compounds in molding compound or plating. This makes SM15T12A-M3/9AT compliant with strict environmental regulations in EU, China, and Japan, and suitable for green manufacturing programs requiring full substance disclosure.
What is the thermal resistance of SM15T12A-M3/9AT, and how does it impact PCB layout?
The SM15T12A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value directly determines minimum copper area needed to dissipate its 6.5 W steady-state power. Reducing pad size increases RθJA, risking thermal runaway during repetitive surges; thus, adhering to the specified pad layout is essential for reliable operation of SM15T12A-M3/9AT in continuous-duty applications.
Can SM15T12A-M3/9AT be used in bidirectional signal lines?
No, SM15T12A-M3/9AT is unidirectional and must not be used on bidirectional signal lines such as USB D+/D− or RS-485 differential pairs. Its cathode band marks polarity, and forward conduction would occur during negative excursions. For bidirectional protection, Vishay specifies the CA-suffixed variant (e.g., SM15T12CA). Using SM15T12A-M3/9AT in place of a bidirectional TVS risks permanent forward conduction and failure; always verify polarity alignment before placing SM15T12A-M3/9AT in circuit.
SM15T12A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 10.2V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 16.7V
- Current - Peak Pulse (10/1000µs):
- 90A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SM15T12A-M3/9AT FAQ
1.How can I place an order for SM15T12A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T12A-M3/9AT 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 SM15T12A-M3/9AT reliable?
The price and inventory of SM15T12A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T12A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T12A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T12A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T12A-M3/9AT?
SM15T12A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T12A-M3/9AT 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 SM15T12A-M3/9AT?
For technical support, including SM15T12A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T12A-M3/9AT requirements.
6.How does Aetrix verify that SM15T12A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T12A-M3/9AT 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 SM15T12A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T12A-M3/9AT?
All SM15T12A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T12A-M3/9AT, 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 SM15T12A-M3/9AT part is unused and in its original packaging.
Return procedure for SM15T12A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T12A-M3/9AT Tags
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