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Vishay General Semiconductor - Diodes Division SM15T39CA-M3/9AT
- Part No.:
- SM15T39CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T39CA-M3/9AT.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,081
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Product details
Overview
SM15T39CA-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), 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR), and 53.9 V clamping voltage (VC) at 28.0 A peak pulse current - used to protect automotive sensor signal lines and industrial I/O interfaces against lightning-induced and switching transients.
For engineers reviewing the SM15T39CA-M3/9AT datasheet, SM15T39CA-M3/9AT pinout, SM15T39CA-M3/9AT application, or SM15T39CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HM3 suffix), low clamping ratio (VC/VBR ≈ 1.37), and halogen-free RoHS compliance per M3 grading.
Technical Context
The SM15T39CA-M3/9AT operates as a voltage-clamped surge protection device with symmetrical avalanche behavior in both polarities, enabling direct placement across differential or AC-coupled signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM).
Designed for high-energy threat suppression, it delivers 1500 W peak pulse power under standardized 10/1000 μs waveform conditions when mounted on 8.0 mm × 8.0 mm copper pads, with thermal resistance RθJA = 75 °C/W and maximum junction temperature of +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold. |
| VBR min/max | 37.1 V / 41.0 V at 1.0 mA test current - verified avalanche onset range ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 53.9 V at 28.0 A (10/1000 μs) - clamping voltage limiting downstream circuit stress; clamping ratio = 1.37×VBR. |
| PPPM | 1500 W - peak transient energy absorption capacity; sufficient for IEC 61000-4-5 Level 4 (4 kV line-to-line) threats. |
| IPPM | 28.0 A - maximum non-repetitive surge current supported without degradation; validated per Fig. 3 waveform. |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments. |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SM15T39CA-M3/9AT uses a two-terminal SMC (DO-214AB) package with no polarity marking for bidirectional operation. Terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102, meeting JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (either polarity) | Acts as cathode during positive half-cycle; enables symmetrical clamping across both voltage polarities. |
| Cathode | Transient current exit point (either polarity) | Acts as anode during negative half-cycle; eliminates need for orientation-aware PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), and ungrounded sensor outputs without polarity constraints. |
| 1500 W peak pulse power | Supports robust immunity to IEC 61000-4-5 surge tests up to 4 kV line-to-line with minimal derating at +85 °C ambient. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes voltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs and ICs. |
| Halogen-free & RoHS-compliant (M3) | Fulfills automotive and industrial environmental compliance requirements while maintaining thermal and electrical performance equivalence to E3 variants. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates baking requirement and supports standard SMT assembly processes. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine control units and ADAS modules exposed to load-dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector interface to limit transient excursions to ≤53.9 V during ISO 7637-2 Pulse 1/2/5a events. Use Value: Prevents sensor IC damage and signal corruption without adding series impedance or affecting DC accuracy due to <1.0 μA leakage at 33.3 V. |
Use Scenario: Safeguarding PLC analog input channels and digital I/O ports connected to field wiring subject to lightning-induced surges and motor contactor switching. IC Role / Device Role / Timing Role: Primary surge suppression element on terminal blocks and backplane connectors, absorbing up to 1500 W pulses before upstream fusing activates. Use Value: Enables >100,000 surge cycles without parameter shift, verified per AEC-Q101 stress testing when ordered with HM3 suffix. |
| Telecom Line Interface Protection | Consumer Equipment Power Input Protection |
|
Use Scenario: Shielding Ethernet PHY magnetics and POTS line drivers from induced surges on outdoor telecom cables and DSL lines. IC Role / Device Role / Timing Role: Secondary-level TVS deployed after gas discharge tube (GDT) primary protection to handle residual fast-rising transients (<100 ns rise time). Use Value: Low junction capacitance (<100 pF at 0 V) avoids signal integrity degradation on 10/100BASE-TX links operating up to 125 MHz. |
Use Scenario: Securing 24 V DC power inputs of smart home hubs, security panels, and PoE-powered devices against accidental AC mains coupling and ESD events. IC Role / Device Role / Timing Role: Standalone overvoltage protector between input filter capacitor and DC-DC converter input, triggered only during >33.3 V excursions. Use Value: Fail-short mode ensures system-level fault detection via upstream current monitoring, eliminating silent failure modes common in Zener-based solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Lower peak power rating (400 W), smaller SMA package (DO-214AC), higher VC/VBR ratio (1.53), same VWM (33.3 V). | Suitable for space-constrained consumer electronics with lower threat severity; not recommended for automotive or industrial surge standards. | Select SMAJ33CA only if board area is critical and surge energy remains below 200 W; verify clamping margin with actual source impedance. |
| SMCJ33CA | Same SMC package, identical VWM/VBR/VC, but rated for 1500 W with tighter VBR tolerance (±5 % vs. ±10 % for SM15T series) and higher IPPM (32.4 A). | Preferred for designs requiring tighter parametric consistency across temperature and production lots, especially in safety-critical subsystems. | Choose SMCJ33CA when statistical process control and reduced VBR spread are required; note higher cost and longer lead times than SM15T39CA-M3/9AT. |
Compared with SMAJ33CA and SMCJ33CA, SM15T39CA-M3/9AT offers optimal balance of surge robustness, cost efficiency, and halogen-free compliance for mid-tier automotive and industrial applications - delivering full 1500 W capability in a widely available commercial-grade variant without premium tolerances or extended qualification overhead.
Availability
SM15T39CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O terminals, and telecom line interface boards requiring stable component supply, long-term lifecycle support, and halogen-free material compliance.
Supply support for SM15T39CA-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 handling, and automotive qualification.
The SM15T series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 1500 W surge immunity and AEC-Q101 readiness are mandatory design requirements.
FAQ
What is the clamping voltage of SM15T39CA-M3/9AT at its rated peak pulse current?
The SM15T39CA-M3/9AT has a maximum clamping voltage (VC) of 53.9 V when subjected to a 10/1000 μs waveform at 28.0 A peak pulse current (IPPM). This value is measured per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuits during surge events. The clamping performance remains stable across -65 °C to +150 °C operating junction temperature.
Is SM15T39CA-M3/9AT qualified to AEC-Q101?
The SM15T39CA-M3/9AT itself is not AEC-Q101 qualified; however, the SM15T39CA-HM3/9AT variant - which shares identical electrical characteristics and SMC packaging but adds the HM3 suffix - is fully AEC-Q101 qualified. The M3 suffix denotes halogen-free RoHS compliance, while HM3 indicates both halogen-free compliance and automotive qualification per AEC-Q101 stress test requirements.
What does the "CA" suffix indicate in SM15T39CA-M3/9AT?
The "CA" suffix in SM15T39CA-M3/9AT explicitly identifies the device as a bidirectional transient voltage suppressor. Unlike unidirectional variants ending in "A", CA devices exhibit symmetrical breakdown and clamping behavior in both forward and reverse directions, making them suitable for AC signal lines, differential interfaces, and ungrounded systems where polarity cannot be guaranteed.
What is the thermal resistance of SM15T39CA-M3/9AT from junction to ambient?
The typical thermal resistance from junction to ambient (RθJA) for SM15T39CA-M3/9AT is 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in Vishay document 88380. This value assumes still air convection and defines the steady-state temperature rise above ambient per watt of continuous power dissipation (PD = 6.5 W).
Can SM15T39CA-M3/9AT be used in place of a unidirectional TVS like SM15T39A-M3/9AT?
SM15T39CA-M3/9AT can replace SM15T39A-M3/9AT only in circuits where bidirectional clamping is acceptable and beneficial - such as across differential pairs or floating signal lines. It must not be substituted in unidirectional applications requiring cathode-anode polarity alignment (e.g., DC power rail protection), as the CA version lacks polarity marking and conducts equally in both directions, potentially causing unintended conduction paths.
SM15T39CA-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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 28A
- 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)
SM15T39CA-M3/9AT FAQ
1.How can I place an order for SM15T39CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T39CA-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 SM15T39CA-M3/9AT reliable?
The price and inventory of SM15T39CA-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 SM15T39CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T39CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T39CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T39CA-M3/9AT?
SM15T39CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T39CA-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 SM15T39CA-M3/9AT?
For technical support, including SM15T39CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T39CA-M3/9AT requirements.
6.How does Aetrix verify that SM15T39CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T39CA-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 SM15T39CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T39CA-M3/9AT?
All SM15T39CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T39CA-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 SM15T39CA-M3/9AT part is unused and in its original packaging.
Return procedure for SM15T39CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T39CA-M3/9AT Tags
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