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Vishay General Semiconductor - Diodes Division SM15T39CA-E3/9AT
- Part No.:
- SM15T39CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T39CA-E3/9AT.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,934
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Product details
Overview
SM15T39CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, with 39 V standoff voltage (VWM), 45.7 V clamping voltage at 28 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 μs waveform. It protects signal lines and power rails in automotive sensor units and industrial I/O interfaces against lightning-induced and switching transients.
For engineers reviewing the SM15T39CA-E3/9AT datasheet, SM15T39CA-E3/9AT pinout, SM15T39CA-E3/9AT application, or SM15T39CA-E3/9AT equivalent, key selection criteria include bidirectional clamping capability, 1500 W surge handling, RoHS-compliant SMC packaging, and AEC-Q101 qualification readiness via HE3 suffix variants.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering consistent clamping performance regardless of transient polarity. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at 33.3 V), while low-inductance SMC construction minimizes voltage overshoot during fast-rising transients.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient, with thermal resistance of 75 °C/W (junction-to-ambient) on standard 8 mm × 8 mm copper pads. Failure mode under overstress is short-circuit, supporting fail-safe system design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - Maximum reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR (min/max) | 37.1 V / 41.0 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 45.7 V at 28.0 A - Clamped voltage during 10/1000 μs surge; determines maximum stress on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling capability; supports protection against lightning and inductive switching surges. |
| Package | SMC (DO-214AB) - Surface-mount package with 7.75 mm × 6.22 mm footprint; compatible with automated placement and reflow. |
| RoHS | E3 suffix - Fully RoHS-compliant, matte tin-plated leads, J-STD-002 solderable, JESD201 Class 2 whisker resistant. |
| TJ max | 150 °C - Enables operation in under-hood automotive and high-temperature industrial environments. |
Pinout & Package
SM15T39CA-E3/9AT uses the SMC (DO-214AB) package: a surface-mount, bidirectional two-terminal device with no polarity marking. Terminals are symmetrical; either end functions as anode or cathode depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Transient conduction path | Both terminals conduct equally during positive or negative transients; no fixed polarity required in layout. |
| Case (cathode band absent) | Mounting interface | No polarity marking; terminals are functionally identical-no orientation dependency during PCB placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV) surges when properly mounted on recommended copper pads. |
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and low leakage drift over temperature and lifetime. |
| Low inductance SMC package | Reduces voltage overshoot during sub-100 ns transients; critical for protecting high-speed interfaces. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow without preconditioning; eliminates moisture-related popcorning risk. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and jump-start transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector entry point to clamp ±40 V transients before reaching signal conditioning circuitry. Use Value: Maintains 33.3 V standoff while clamping to ≤45.7 V, preserving integrity of 3.3 V/5 V microcontrollers and ADC inputs. | Use Scenario: Shielding PLC digital input modules from inductive kickback generated by solenoid valves and relay coils in factory automation. IC Role / Device Role / Timing Role: Transient suppression on 24 V DC input lines upstream of optocoupler isolation stages. Use Value: 1500 W rating handles repetitive 10/1000 μs surges up to 28 A without degradation, ensuring long-term reliability. |
| Telecom Line Interface | Consumer Power Adapter ESD |
Use Scenario: Safeguarding Ethernet PHY front-end circuits and PoE injectors against lightning-induced surges on twisted-pair cables. IC Role / Device Role / Timing Role: Primary-level surge protector on RJ45 jack side, coordinated with secondary GDT or polymer TVS. Use Value: Symmetrical clamping avoids signal distortion on differential pairs; 45.7 V VC limits stress on 100BASE-TX transformer insulation. | Use Scenario: Secondary-side transient suppression on USB-C or barrel-jack inputs of smart home hubs and audio adapters. IC Role / Device Role / Timing Role: Final-stage clamping device after fuse and common-mode choke, absorbing residual ESD and line noise. Use Value: Low-leakage (<1 μA) prevents standby current drain; RoHS/E3 compliance meets global consumer safety regulations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ39CA | 600 W PPPM rating, SMA package, higher RθJA (110 °C/W), same VWM/VC specs | Limited to lower-energy threats; unsuitable for IEC 61000-4-5 Level 4 | Select when board space is constrained and surge threat level is ≤1 kV. |
| SMCJ39CA | 1500 W PPPM, same SMC package, but VWM = 33.2 V, VC = 46.3 V at 27.5 A | Nearly identical performance; minor clamping voltage variance due to process binning | Drop-in alternative if tighter VC tolerance or extended AEC-Q101 qualification is required. |
Compared with SMAJ39CA and SMCJ39CA, SM15T39CA-E3/9AT delivers identical 1500 W surge capacity and SMC mechanical compatibility but offers optimized thermal resistance (75 °C/W vs. 110 °C/W) and broader manufacturer support for high-volume automotive programs.
Availability
SM15T39CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor units, industrial PLC I/O modules, telecom line interfaces, and consumer power adapter designs requiring stable component supply and full traceability.
Supply support for SM15T39CA-E3/9AT 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 and application-specific optimization.
The SM15T Series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where failure modes must be controlled and surge immunity must meet IEC/ISO standards.
FAQ
What is the clamping voltage of SM15T39CA-E3/9AT at its rated peak pulse current?
The SM15T39CA-E3/9AT has a maximum clamping voltage (VC) of 45.7 V at 28.0 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal, and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SM15T39CA-E3/9AT suitable for automotive applications?
Yes, SM15T39CA-E3/9AT is RoHS-compliant and designed for automotive-grade use; its base P/N-E3 variant supports AEC-Q101 qualification when ordered with HE3 suffix (e.g., SM15T39CAHE3_A/I). The device operates from −65 °C to +150 °C and features glass-passivated junctions for long-term reliability in under-hood environments.
Does SM15T39CA-E3/9AT have polarity markings on the package?
No, SM15T39CA-E3/9AT is a bidirectional TVS diode and carries no polarity marking such as a cathode band. Its SMC (DO-214AB) package has symmetrical terminals, and either end functions identically depending on transient polarity-eliminating orientation concerns during PCB assembly.
What is the maximum reverse leakage current for SM15T39CA-E3/9AT at its standoff voltage?
At the specified standoff voltage (VWM) of 33.3 V and TA = 25 °C, SM15T39CA-E3/9AT exhibits a maximum reverse leakage current (ID) of 1.0 μA. This low leakage preserves signal integrity and minimizes standby power loss in battery-powered or high-impedance sensing circuits.
How does the SMC package of SM15T39CA-E3/9AT compare to SMA in surge handling?
The SMC package used by SM15T39CA-E3/9AT provides significantly lower thermal resistance (RθJA = 75 °C/W) than the SMA package (RθJA ≈ 110 °C/W), enabling sustained 1500 W peak pulse power dissipation. This allows SM15T39CA-E3/9AT to handle higher energy transients without thermal runaway compared to SMA-based alternatives like SMAJ39CA.
SM15T39CA-E3/9AT 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-E3/9AT FAQ
1.How can I place an order for SM15T39CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T39CA-E3/9AT 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-E3/9AT reliable?
The price and inventory of SM15T39CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T39CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T39CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T39CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T39CA-E3/9AT?
SM15T39CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T39CA-E3/9AT 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-E3/9AT?
For technical support, including SM15T39CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T39CA-E3/9AT requirements.
6.How does Aetrix verify that SM15T39CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T39CA-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T39CA-E3/9AT?
All SM15T39CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T39CA-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for SM15T39CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T39CA-E3/9AT Tags
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