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Vishay General Semiconductor - Diodes Division SM15T39CAHE3_A/I
- Part No.:
- SM15T39CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T39CAHE3_A/I.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,324
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Product details
Overview
SM15T39CAHE3_A/I 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 against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T39CAHE3_A/I datasheet, SM15T39CAHE3_A/I pinout, SM15T39CAHE3_A/I application, or SM15T39CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 1500 W surge rating, low clamping ratio (VC/VBR ≈ 1.38), and compatibility with high-reliability automotive PCB layouts requiring MSL Level 1 and 260 °C reflow.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, delivering consistent clamping performance without polarity dependence. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and robust ESD immunity up to ±30 kV (HBM), while the low-inductance SMC package minimizes voltage overshoot during fast transients.
The device is thermally characterized with RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable operation up to TJ = +150 °C. It meets JESD201 Class 2 whisker resistance and is qualified per AEC-Q101 for automotive under-hood and chassis applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - guaranteed breakdown threshold defining turn-on precision |
| VC @ IPPM | 53.9 V at 28.0 A (10/1000 μs) - peak clamped voltage protecting downstream ICs from overvoltage |
| PPPM | 1500 W - surge energy handling capacity for lightning and inductive load switching events |
| TJ max. | +150 °C - maximum junction temperature supporting under-hood automotive deployment |
| Package | SMC (DO-214AB) - surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal requirement |
| AEC-Q101 | Qualified - validated for automotive reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
SM15T39CAHE3_A/I is a bidirectional TVS diode in SMC (DO-214AB) package with no polarity marking; both terminals are functionally identical and symmetrical. The case conforms to JEDEC DO-214AB mechanical standard, featuring matte tin-plated leads solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals serve as interchangeable surge current entry/exit points; no cathode band marking |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 surges |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on protected MOSFETs or CAN transceivers during clamping |
| AEC-Q101 qualification (HE3 suffix) | Validates long-term reliability in automotive environments including thermal shock and humidity testing |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns |
| Glass-passivated junction | Ensures stable leakage current (<1.0 μA) and repeatable VBR over lifetime and temperature |
Applications
| Automotive Sensor Protection | Industrial Motor Drive I/O |
|---|---|
Use Scenario: Protecting ABS wheel speed sensor signal lines from inductive kickback and battery dump transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential sensor output pins to limit transient excursions to <54 V. Use Value: Prevents latch-up or damage to analog front-end amplifiers and ADC inputs while maintaining signal integrity below 33.3 V normal operation. | Use Scenario: Shielding PLC analog input modules from switching noise generated by contactors and solenoids in factory automation cabinets. IC Role / Device Role / Timing Role: Parallel-connected TVS on 4–20 mA current loop inputs to absorb 1500 W surges without affecting loop accuracy. Use Value: Maintains <1.0 μA leakage at 24 V system rail, avoiding offset errors in precision current measurement circuits. |
| Telecom Line Interface | Automotive Body Control Module |
Use Scenario: Safeguarding RS-485 transceiver bus lines in outdoor telecom equipment exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional clamping device placed between A/B differential lines and ground to suppress common-mode transients. Use Value: Clamps 10/1000 μs surges to ≤53.9 V while preserving signal rise time due to low junction capacitance (~200 pF typical). | Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from load-dump events during battery disconnect/reconnect in door module ECUs. IC Role / Device Role / Timing Role: Low-inductance TVS mounted directly at connector entry point to minimize PCB trace inductance effects. Use Value: Achieves failure mode of short-circuit under overstress-enabling fuse coordination and preventing fire hazard in safety-critical zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA-E3/57T | 600 W PPPM, 33 V VWM, SMA package (smaller thermal mass) | Limited to lower-energy threats (IEC 61000-4-5 Level 2); not AEC-Q101 qualified | Select when cost or board space is critical and surge threat level is moderate |
| 1.5KE33CA | 1500 W PPPM, 33 V VWM, DO-201 package (axial leaded) | Not surface-mountable; incompatible with automated SMT assembly | Select only for through-hole prototyping or legacy repair where reflow compatibility is not required |
Compared with SMAJ33CA-E3/57T and 1.5KE33CA, SM15T39CAHE3_A/I delivers higher surge robustness in an AEC-Q101-qualified SMC package, enabling direct replacement in automotive production lines without layout or process changes - while offering superior thermal derating above 25 °C due to lower RθJA.
Availability
SM15T39CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial motor drive I/O safeguarding, and telecom line interface hardening requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SM15T39CAHE3_A/I 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, efficiency, and application-specific optimization.
The SM15T Series was engineered specifically for high-energy transient suppression in automotive and industrial environments, combining AEC-Q101 qualification, 1500 W surge capability, and SMC packaging for automated manufacturing and thermal performance.
FAQ
What does the "CA" suffix indicate in SM15T39CAHE3_A/I?
The "CA" suffix denotes a bidirectional configuration: SM15T39CAHE3_A/I clamps transients equally in both polarities, unlike unidirectional variants (e.g., SM15T39A). This makes it ideal for AC-coupled or differential signal lines such as CAN, LIN, or RS-485 buses where polarity reversal may occur. The device has no cathode marking, confirming its symmetrical construction.
Is SM15T39CAHE3_A/I suitable for automotive applications?
Yes - SM15T39CAHE3_A/I carries the HE3 suffix, indicating full AEC-Q101 qualification per Vishay's documentation. It has passed stress tests including temperature cycling, high-temperature reverse bias, and ESD (HBM ≥30 kV), making it approved for use in automotive body control modules, sensor interfaces, and infotainment systems requiring long-term reliability under harsh conditions.
What is the clamping voltage of SM15T39CAHE3_A/I at its rated peak pulse current?
The clamping voltage (VC) of SM15T39CAHE3_A/I is 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 maximum voltage seen by protected circuitry during worst-case surge events.
How does the SMC (DO-214AB) package of SM15T39CAHE3_A/I affect thermal performance?
The SMC package provides RθJA = 75 °C/W and RθJL = 15 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This enables SM15T39CAHE3_A/I to sustain 6.5 W continuous power dissipation at 50 °C ambient and supports safe operation up to +150 °C junction temperature - critical for under-hood automotive placement.
Does SM15T39CAHE3_A/I require polarity-aware PCB layout?
No - SM15T39CAHE3_A/I is a bidirectional TVS with symmetrical terminals and no polarity marking. PCB layout need not distinguish anode/cathode; either terminal may connect to signal or ground. This simplifies routing on differential pairs and eliminates orientation errors during automated placement, reducing manufacturing defects.
SM15T39CAHE3_A/I 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SM15T39CAHE3_A/I FAQ
1.How can I place an order for SM15T39CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T39CAHE3_A/I 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 SM15T39CAHE3_A/I reliable?
The price and inventory of SM15T39CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T39CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SM15T39CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T39CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T39CAHE3_A/I?
SM15T39CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T39CAHE3_A/I 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 SM15T39CAHE3_A/I?
For technical support, including SM15T39CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T39CAHE3_A/I requirements.
6.How does Aetrix verify that SM15T39CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM15T39CAHE3_A/I 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 SM15T39CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SM15T39CAHE3_A/I?
All SM15T39CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T39CAHE3_A/I, 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 SM15T39CAHE3_A/I part is unused and in its original packaging.
Return procedure for SM15T39CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T39CAHE3_A/I Tags
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