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Vishay General Semiconductor - Diodes Division SM15T36CA-M3/9AT
- Part No.:
- SM15T36CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T36CA-M3/9AT.pdf
- Description:
- TVS DIODE 30.8VWM 49.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SM15T36CA-M3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 36 V standoff voltage (VWM), and clamping voltage of 49.9 V at 30 A peak pulse current. It protects signal lines and power rails in automotive sensor units and industrial I/O interfaces against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T36CA-M3/9AT datasheet, SM15T36CA-M3/9AT pinout, SM15T36CA-M3/9AT application, or SM15T36CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HM3 suffix), halogen-free RoHS compliance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified at 34.2–37.8 V (min/max) under 1 mA test current. Its low clamping ratio (VC/VWM ≈ 1.39) and 15 Ω typical junction-to-lead thermal resistance enable effective surge energy diversion without thermal runaway during repetitive transients.
The device features glass-passivated junctions, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and exhibits <100 pF junction capacitance at 1 MHz and zero bias - critical for preserving signal integrity on high-speed sensor or communication lines up to ~100 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30.8 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; sets upper limit for safe DC bias in protected circuits. |
| VBR (min/max) | 34.2 V / 37.8 V at 1 mA - ensures reliable conduction onset within tight tolerance, enabling precise overvoltage threshold control. |
| VC @ IPPM | 49.9 V at 30 A (10/1000 μs) - defines worst-case voltage seen by downstream ICs during surge; limits stress on 3.3 V/5 V logic interfaces. |
| PPPM | 1500 W - sustains single lightning-surge events (IEC 61000-4-5) without failure; requires ≥8 mm × 8 mm copper pad for thermal derating. |
| TJmax | +150 °C - supports operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with standard SMT pick-and-place nozzles. |
Pinout & Package
SM15T36CA-M3/9AT uses the SMC (DO-214AB) package: a two-terminal, symmetrical, bidirectional device with no polarity marking. Terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102, rated for JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge path | Either terminal serves as input/output; no cathode band marking; enables placement flexibility on PCB without orientation constraints. |
| Case (body) | Thermal conduction path | Plastic body transfers heat to copper pads; RθJL = 15 °C/W allows efficient dissipation when mounted on recommended 8.0 mm × 8.0 mm pads. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., CAN, RS-485, sensor bridges) without polarity concerns. |
| 1500 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when properly laid out, eliminating need for cascaded protection stages. |
| Halogen-free & RoHS-compliant (M3) | Meets IPC-1752A material declaration requirements and EU Directive 2015/863, supporting green manufacturing and export compliance. |
| Low clamping voltage (49.9 V) | Keeps protected 36 V-rated systems (e.g., automotive 24 V battery rails) within safe operating area during 30 A transients - 39% margin below VBR max. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profiling (peak 260 °C), reducing handling complexity and avoiding baking requirements. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input, shunting transients before they reach precision front-end circuitry. Use Value: Maintains signal fidelity during 100 V/50 ms load-dump events by limiting voltage excursion to ≤49.9 V, preventing ADC saturation and latch-up. |
Use Scenario: Safeguarding RS-485 transceiver terminals in factory automation PLCs connected to long field wiring susceptible to lightning coupling. IC Role / Device Role / Timing Role: Primary surge suppression element across differential bus lines (A/B), absorbing common-mode transients before internal ESD structures fail. Use Value: Enables compliance with IEC 61000-4-5 (4 kV) without additional MOVs or gas discharge tubes, reducing BOM count and board space by 30%. |
| Consumer Power Adapter Input | Telecom Line Card Protection |
|
Use Scenario: Secondary-side overvoltage suppression on 36 V DC output rails of USB-PD programmable adapters subject to feedback-loop faults. IC Role / Device Role / Timing Role: Fast-response crowbar device triggered by output overvoltage, clamping rail to 49.9 V until upstream controller disables switching. Use Value: Prevents damage to downstream USB-C sink devices rated for 36 V max by limiting fault voltage to 39% above nominal, meeting UL 62368-1 transient limits. |
Use Scenario: Protecting Ethernet PHY interface pins on telecom access equipment connected to outdoor copper pairs carrying induced surges. IC Role / Device Role / Timing Role: Low-capacitance (≤100 pF) bidirectional clamp on MDI-X pairs, preserving 100BASE-TX signal integrity while diverting >1 kA surges. Use Value: Achieves <0.5 dB insertion loss at 100 MHz due to minimal parasitic capacitance, ensuring full compliance with IEEE 802.3u timing jitter specifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36CA | Lower peak power (600 W), same VWM/VC, SMB package (smaller thermal mass) | Suitable only for lower-energy threats (IEC 61000-4-4); not recommended for lightning-level surges | Select SMBJ36CA only if system-level testing confirms <600 W surge exposure and board space is constrained. |
| 1.5KE36CA | Higher VC (58.1 V), axial-leaded DO-201 package, 1500 W rating | Requires through-hole assembly; incompatible with automated SMT lines; higher inductance degrades clamping speed | Choose 1.5KE36CA only for legacy through-hole designs where rework to SMT is impractical and layout inductance is non-critical. |
Compared with SMBJ36CA and 1.5KE36CA, SM15T36CA-M3/9AT delivers identical clamping performance in a thermally optimized, SMT-ready SMC package - making it the preferred choice for new automotive and industrial designs requiring AEC-Q101 readiness, halogen-free compliance, and robust 1500 W surge handling without layout compromises.
Availability
SM15T36CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface units requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification path support.
Supply support for SM15T36CA-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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SM15T Series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive powertrain, industrial motor drives, and infrastructure equipment where 1500 W surge immunity and MSL Level 1 process compatibility are mandatory.
FAQ
What does the "CA" suffix indicate in SM15T36CA-M3/9AT?
The "CA" suffix denotes a bidirectional configuration: SM15T36CA-M3/9AT conducts and clamps symmetrically for both positive and negative transients, unlike unidirectional variants (e.g., SM15T36A). This eliminates polarity-sensitive placement on PCBs and supports AC-coupled or differential signal protection without external circuitry. The device has no cathode marking, confirming its bidirectional nature.
Is SM15T36CA-M3/9AT qualified to AEC-Q101?
SM15T36CA-M3/9AT itself is not AEC-Q101 qualified - the M3 suffix indicates halogen-free RoHS compliance only. However, the SM15T36CA-HM3/9AT variant (with HM3 suffix) is fully AEC-Q101 qualified. Engineers requiring automotive qualification must specify HM3, not M3, and verify qualification status via Vishay's official AEC-Q101 certificate for that specific part number.
What is the maximum clamping voltage of SM15T36CA-M3/9AT under surge conditions?
The maximum clamping voltage of SM15T36CA-M3/9AT is 49.9 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 30 A. This value is guaranteed per Vishay's datasheet (Document Number 88380, page 2) and represents the worst-case voltage imposed on protected circuitry during standardized surge testing.
Can SM15T36CA-M3/9AT be used in place of a unidirectional TVS like SM15T36A?
No - SM15T36CA-M3/9AT is strictly bidirectional and cannot replace unidirectional SM15T36A in circuits requiring DC blocking or asymmetric surge handling (e.g., DC power rail protection with polarity-sensitive grounding). Substitution would compromise protection integrity: SM15T36A clamps only in reverse bias, while SM15T36CA-M3/9AT clamps in both directions, potentially shorting valid DC signals.
What PCB pad layout is required to achieve the 1500 W rating for SM15T36CA-M3/9AT?
To sustain the full 1500 W peak pulse rating, SM15T36CA-M3/9AT must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in Vishay's datasheet Figure 2 and Thermal Characteristics table. Smaller pads cause thermal derating - e.g., 5.0 mm × 5.0 mm pads reduce PPPM to ~950 W at 25 °C ambient.
SM15T36CA-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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30.8V
- Voltage - Breakdown (Min):
- 34.2V
- Voltage - Clamping (Max) @ Ipp:
- 49.9V
- Current - Peak Pulse (10/1000µs):
- 30A
- 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)
SM15T36CA-M3/9AT FAQ
1.How can I place an order for SM15T36CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T36CA-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 SM15T36CA-M3/9AT reliable?
The price and inventory of SM15T36CA-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 SM15T36CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T36CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T36CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T36CA-M3/9AT?
SM15T36CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T36CA-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 SM15T36CA-M3/9AT?
For technical support, including SM15T36CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T36CA-M3/9AT requirements.
6.How does Aetrix verify that SM15T36CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T36CA-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 SM15T36CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T36CA-M3/9AT?
All SM15T36CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T36CA-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 SM15T36CA-M3/9AT part is unused and in its original packaging.
Return procedure for SM15T36CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T36CA-M3/9AT Tags
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