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Vishay General Semiconductor - Diodes Division SM15T39CA-E3/57T
- Part No.:
- SM15T39CA-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T39CA-E3/57T.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:285
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Product details
Overview
SM15T39CA-E3/57T 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-E3/57T datasheet, SM15T39CA-E3/57T pinout, SM15T39CA-E3/57T application, or SM15T39CA-E3/57T equivalent, key selection criteria include bidirectional clamping capability, 1500 W surge rating, RoHS-compliant commercial-grade construction, AEC-Q101 qualification availability, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with no polarity marking on the device body. Its glass-passivated junction ensures stable breakdown behavior under repetitive transient stress, and low-inductance SMC package minimizes voltage overshoot during fast-rising surges (e.g., 8/20 μs or 10/1000 μs waveforms).
Thermal performance is defined by RθJA = 75 °C/W (typ.) and RθJL = 15 °C/W (typ.), supporting reliable operation up to TJ = +150 °C. The device fails short-circuit under overstress - a predictable, system-safe failure mode aligned with IEC 61000-4-5 compliance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - maximum continuous reverse operating voltage before significant leakage; sets upper limit for normal circuit bias |
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - verified breakdown threshold range ensuring consistent clamping onset across production lots |
| VC @ IPPM | 53.9 V at 28.0 A (10/1000 μs) - actual worst-case clamped voltage seen by protected IC during standardized surge event |
| PPPM | 1500 W - peak transient power handling capacity; enables protection against lightning-induced surges per IEC 61000-4-5 Level 4 |
| TJ max | +150 °C - maximum junction temperature defining thermal derating envelope for sustained operation in automotive under-hood environments |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with IPC-7351B standard land patterns |
Pinout & Package
SM15T39CA-E3/57T 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, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive half-cycle) | One of two symmetrical terminals; conducts during positive voltage excursions above VBR |
| Cathode | Transient current entry point (negative half-cycle) | Second symmetrical terminal; conducts during negative voltage excursions below −VBR; no band marking distinguishes polarity |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management |
| 1500 W peak pulse power | Supports robust immunity to IEC 61000-4-5 4 kV/2 Ω surge testing without derating for board-level layout constraints |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage (<1.0 μA at VWM) across temperature and humidity stress |
| MSL Level 1 (260 °C) | Permits unlimited floor life and single-reflow processing without moisture sensitivity concerns in high-volume SMT lines |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine control modules exposed to load-dump and alternator ripple. IC Role / Device Role: Bidirectional voltage clamp placed between signal line and ground, limiting transients to <53.9 V during 10/1000 μs surges. Use Value: Prevents latch-up or gate oxide damage in downstream ASICs while maintaining signal integrity below 33.3 V DC operating range. | Use Scenario: Safeguarding digital input channels of programmable logic controllers connected to field actuators with inductive kickback (e.g., solenoids, contactors). IC Role / Device Role: Transient shunt mounted directly at connector interface to divert >28 A surge current away from isolation barrier and microcontroller GPIO. Use Value: Eliminates need for discrete RC snubbers or relay-based isolation, reducing BOM count and PCB area in DIN-rail mounted control units. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding Ethernet PHY differential pairs and RS-485 transceivers in outdoor telecom equipment subjected to indirect lightning coupling. IC Role / Device Role: Common-mode TVS pair (one per line) referenced to chassis ground, clamping common-mode surges to <53.9 V differential swing. Use Value: Meets GR-1089-CORE Level 3 surge immunity without compromising 100 Mbps data integrity due to low junction capacitance (~200 pF typical). | Use Scenario: Adding secondary-level surge suppression on USB-C and barrel-jack inputs of smart home hubs and wireless routers. IC Role / Device Role: Final-stage protector after primary MOV/fuse stage, absorbing residual energy from 8/20 μs ESD events per IEC 61000-4-2 ±15 kV contact discharge. Use Value: Extends product lifetime in ungrounded consumer environments where primary protection may degrade over time due to repeated small surges. |
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 (400 W), smaller SMA package (DO-214AC), VC = 53.3 V @ 7.5 A | Suitable only for lower-energy threats (IEC 61000-4-2 ESD, not full lightning); limited thermal mass for repeated surges | Select when board space is constrained and surge threat level is ≤ Level 3 IEC 61000-4-5 |
| SMCJ33CA | Same SMC package, higher peak power (1500 W), identical VWM/VBR/VC, but rated for 33.3 V VWM with tighter VBR tolerance (37.1–41.0 V vs. 37.1–40.9 V) | Drop-in replacement in most layouts; slightly improved consistency in clamping threshold across temperature | Prefer for new designs requiring marginally tighter VBR distribution or extended lifecycle validation |
Compared with SMAJ33CA and SMCJ33CA, SM15T39CA-E3/57T delivers identical clamping performance and package compatibility as SMCJ33CA but with documented AEC-Q101 qualification path (via HE3 suffix variants), making it preferred for automotive OEM applications requiring component-level reliability certification.
Availability
SM15T39CA-E3/57T is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O protection, and telecom line interface applications requiring stable component supply, RoHS-compliant commercial-grade construction, and support for high-volume SMT assembly.
Supply support for SM15T39CA-E3/57T 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 designed specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where 1500 W surge immunity and AEC-Q101 readiness are mandatory design requirements.
FAQ
What is the clamping voltage of SM15T39CA-E3/57T at its rated peak pulse current?
The SM15T39CA-E3/57T 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 circuitry during standardized surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SM15T39CA-E3/57T suitable for automotive applications?
Yes, SM15T39CA-E3/57T is RoHS-compliant and commercially qualified; AEC-Q101-qualified versions are available under ordering codes like SM15T39CAHE3_A/H. While the E3/57T variant itself is commercial grade, its construction - including glass-passivated junction, MSL Level 1 rating, and −65 °C to +150 °C operating range - aligns with automotive under-hood environmental requirements when paired with appropriate system-level validation.
What does the "CA" suffix indicate in SM15T39CA-E3/57T?
The "CA" suffix in SM15T39CA-E3/57T denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SM15T39A), the CA version has no cathode band marking and is used where signal lines lack defined polarity, such as AC-coupled interfaces or differential buses like RS-485 or CAN.
What is the thermal resistance of SM15T39CA-E3/57T from junction to ambient?
The typical thermal resistance from junction to ambient (RθJA) for SM15T39CA-E3/57T is 75 °C/W, measured on a standard 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad per terminal. This value assumes no additional heatsinking and guides thermal derating - for example, at 75 °C ambient, maximum continuous power dissipation drops to ~3.25 W to maintain TJ ≤ 150 °C.
How does SM15T39CA-E3/57T differ from SM15T33CA in terms of electrical rating?
SM15T39CA-E3/57T has a 33.3 V stand-off voltage (VWM) and 37.1–41.0 V breakdown range, whereas SM15T33CA specifies 29.7 V VWM and 33.0–36.5 V VBR. Both share identical 1500 W PPPM, SMC package, and bidirectional functionality - but SM15T39CA-E3/57T targets higher-voltage systems (e.g., 24 V automotive or 36 V industrial rails) where tighter margin between VWM and nominal supply is required.
SM15T39CA-E3/57T 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-E3/57T FAQ
1.How can I place an order for SM15T39CA-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T39CA-E3/57T 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-E3/57T reliable?
The price and inventory of SM15T39CA-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T39CA-E3/57T is usually 5 days.
3.What payment methods are accepted for SM15T39CA-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T39CA-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T39CA-E3/57T?
SM15T39CA-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T39CA-E3/57T 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-E3/57T?
For technical support, including SM15T39CA-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T39CA-E3/57T requirements.
6.How does Aetrix verify that SM15T39CA-E3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T39CA-E3/57T 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-E3/57T meets industry standards.
7.What is the process for return or replacement of SM15T39CA-E3/57T?
All SM15T39CA-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T39CA-E3/57T, 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-E3/57T part is unused and in its original packaging.
Return procedure for SM15T39CA-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T39CA-E3/57T Tags
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