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Vishay General Semiconductor - Diodes Division 1.5SMC39CA-M3/9AT
- Part No.:
- 1.5SMC39CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC39CA-M3/9AT.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:8,159
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Product details
Overview
1.5SMC39CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on signal or power lines. It features 39 V breakdown voltage (VBR min/max = 37.1–41.0 V at 1.0 mA), 33.3 V stand-off voltage (VWM), 53.9 V maximum clamping voltage (VC) at 27.8 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, sensor interfaces, and automotive ECUs against lightning and inductive switching surges.
For engineers reviewing the 1.5SMC39CA-M3/9AT datasheet, 1.5SMC39CA-M3/9AT pinout, 1.5SMC39CA-M3/9AT application, or 1.5SMC39CA-M3/9AT equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal derating curves, SMC package mechanical data, and direct alternatives qualified for industrial and AEC-Q101-compliant designs.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VWM, IPPM, and VC specifications in forward and reverse directions. Its glass-passivated junction ensures stable avalanche characteristics and low leakage (<1.0 µA at VWM), while MSL Level 1 moisture sensitivity supports lead-free reflow up to 260 °C peak.
The device sustains 1500 W peak pulse power under 10/1000 µs waveform with 0.01% duty cycle, exhibits 0.100 %/°C temperature coefficient of VBR, and achieves thermal resistance of 75 °C/W (junction-to-ambient) on standard 8.0 mm × 8.0 mm copper pads - enabling robust transient suppression without active cooling in space-constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - defines reliable avalanche initiation threshold for bidirectional clamping |
| VWM | 33.3 V - maximum continuous reverse voltage before significant leakage; sets safe operating margin below VBR |
| VC @ IPPM | 53.9 V at 27.8 A - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum overvoltage stress |
| PPPM | 1500 W - peak transient energy absorption capability; enables protection against IEC 61000-4-5 Level 4 surges |
| IPPM | 27.8 A - maximum non-repetitive surge current; defines minimum trace width and fuse coordination requirements |
| TJ max | +150 °C - maximum junction temperature; allows operation in under-hood automotive or industrial ambient up to +125 °C |
| Package | SMC (DO-214AB) - standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place |
Pinout & Package
SMC (DO-214AB) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, and no polarity marking for bidirectional configuration. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per Vishay specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative polarity) | Accepts surge current during negative half-cycle; connects to line being protected |
| Cathode | Transient current entry point (positive polarity) | Accepts surge current during positive half-cycle; connects to line being protected |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout in AC or differential signal lines |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 4th-level surges (4 kV line-earth, 2 kV line-line) without degradation when properly mounted |
| MSL Level 1 rating | Supports Pb-free reflow up to 260 °C peak without baking - reduces manufacturing complexity and cost |
| AEC-Q101 qualification option | M3 suffix indicates halogen-free, RoHS-compliant construction; HE3/HM3 variants available for automotive-grade reliability validation |
| Low incremental surge resistance | Enables tight VC – VBR margin (16.8 V) - minimizes voltage overshoot during fast transients like ESD or relay bounce |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver inputs and outputs from load dump, jump-start, and inductive switching events in engine control modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential bus lines (CAN_H/CAN_L) or single-ended sensor supply rails. Use Value: Limits transient voltage to ≤53.9 V during 27.8 A surges, preventing damage to ISO 11898-compliant transceivers rated for 40 V absolute maximum. |
Use Scenario: Safeguarding RS-485/RS-422 communication ports in PLCs and motor drives against ground loop surges and EFT bursts. IC Role / Device Role / Timing Role: Paired TVS devices (one per line) referenced to common ground, absorbing common-mode and differential-mode transients. Use Value: Clamps 10/1000 µs surges within 1 ns response time, maintaining signal integrity below 25 Mbps data rates without added capacitance-induced jitter. |
| Consumer Power Adapter Input Stage | Telecom DSL Line Card Surge Protection |
|
Use Scenario: Secondary-side overvoltage suppression on 24 V DC outputs of wall adapters exposed to lightning-induced surges via connected cables. IC Role / Device Role / Timing Role: Final-stage TVS placed between output rail and ground, downstream of filtering and regulation. Use Value: Absorbs 1500 W transient energy without failure, allowing use of smaller input capacitors and eliminating need for secondary crowbar circuits. |
Use Scenario: Primary protection for ADSL/VDSL line interface ICs against longitudinal surges coupled from telephone exchange lines. IC Role / Device Role / Timing Role: Bidirectional suppressor bridging tip/ring pair before hybrid transformer and line driver. Use Value: Withstands repeated 10/700 µs surges per ITU-T K.21 Basic Level while maintaining <1.0 µA leakage at 33.3 V - preserving low-noise analog performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ39CA | Same VBR/VC specs but lower PPPM (600 W); SMB package (smaller footprint, higher RθJA = 85 °C/W) | Limited to lower-energy transients (IEC 61000-4-5 Level 2); unsuitable for high-power industrial mains coupling | Select when board space is constrained and surge threat level is ≤1 kV line-earth; verify thermal margin at 125 °C ambient |
| 1.5KE39CA | Same electrical specs but axial-leaded DO-201 package; higher mounting inductance, no SMT compatibility | Requires through-hole assembly; not suitable for automated production or high-frequency transient suppression | Choose only for prototyping or legacy through-hole designs; avoid in new SMT-based automotive or telecom platforms |
Compared with 1.5SMC39CA-M3/9AT, SMBJ39CA trades peak power and thermal robustness for compact size, while 1.5KE39CA sacrifices SMT manufacturability and high-frequency response for identical clamping performance in legacy formats - making the 1.5SMC39CA-M3/9AT optimal for volume automotive and industrial SMT deployments requiring 1500 W surge handling.
Availability
1.5SMC39CA-M3/9AT is available at Aetrix Electronics and suitable for automotive ECU protection, industrial fieldbus interfaces, consumer power adapter secondary-side clamping, and telecom line card surge suppression requiring stable component supply across multi-year production cycles.
Supply support for 1.5SMC39CA-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 AEC-Q101 qualification.
The 1.5SMC Series was developed for high-power, surface-mount transient suppression in automotive, industrial, and telecom systems where automated assembly, thermal resilience, and repeatable clamping performance are critical design requirements.
FAQ
What does the "CA" suffix indicate in 1.5SMC39CA-M3/9AT?
The "CA" suffix in 1.5SMC39CA-M3/9AT denotes a bidirectional configuration - meaning the device provides symmetrical transient voltage suppression in both polarities, with identical breakdown, clamping, and leakage characteristics regardless of voltage polarity applied across its terminals. This eliminates polarity marking on the SMC package and simplifies layout for AC-coupled or differential signal lines.
Is 1.5SMC39CA-M3/9AT qualified for automotive applications?
The base 1.5SMC39CA-M3/9AT is halogen-free and RoHS-compliant but not AEC-Q101 qualified. However, Vishay offers automotive-grade variants under ordering codes HM3_X (e.g., 1.5SMC39CAHM3_A/I), which include full AEC-Q101 stress testing and extended temperature validation - essential for under-hood or safety-critical vehicle subsystems.
What is the maximum clamping voltage of 1.5SMC39CA-M3/9AT under surge conditions?
The maximum clamping voltage (VC) of 1.5SMC39CA-M3/9AT is 53.9 V at 27.8 A peak pulse current with a 10/1000 µs waveform. This value represents the upper limit of voltage seen by downstream circuitry during worst-case transient events and must be compared against the absolute maximum ratings of protected ICs such as CAN transceivers or microcontrollers.
How does the SMC package of 1.5SMC39CA-M3/9AT compare thermally to SMA or SMB packages?
The SMC (DO-214AB) package of 1.5SMC39CA-M3/9AT provides lower thermal resistance than SMA (DO-214AC) or SMB (DO-214AA): RθJA is 75 °C/W (vs. ~90–100 °C/W for SMB/SMA on same pad layout), enabling higher sustained surge repetition rates and improved reliability in high-ambient-temperature environments like automotive engine compartments.
Can 1.5SMC39CA-M3/9AT be used in place of unidirectional 1.5SMC39A-M3/9AT?
No - 1.5SMC39CA-M3/9AT is bidirectional and lacks cathode band marking, while 1.5SMC39A-M3/9AT is unidirectional with explicit polarity. Substituting them requires verifying circuit topology: bidirectional use is mandatory for AC signals or differential buses, whereas unidirectional types are required for DC rail-to-ground clamping where reverse conduction must be blocked.
1.5SMC39CA-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, 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):
- 27.8A
- 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)
1.5SMC39CA-M3/9AT FAQ
1.How can I place an order for 1.5SMC39CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC39CA-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 1.5SMC39CA-M3/9AT reliable?
The price and inventory of 1.5SMC39CA-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 1.5SMC39CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC39CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC39CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC39CA-M3/9AT?
1.5SMC39CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC39CA-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 1.5SMC39CA-M3/9AT?
For technical support, including 1.5SMC39CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC39CA-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC39CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC39CA-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 1.5SMC39CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC39CA-M3/9AT?
All 1.5SMC39CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC39CA-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 1.5SMC39CA-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC39CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC39CA-M3/9AT Tags
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