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Vishay General Semiconductor - Diodes Division 1.5SMC39CA-E3/9AT
- Part No.:
- 1.5SMC39CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC39CA-E3/9AT.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
1.5SMC39CA-E3/9AT 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 a 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR) at 1 mA, 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, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the 1.5SMC39CA-E3/9AT datasheet, 1.5SMC39CA-E3/9AT pinout, 1.5SMC39CA-E3/9AT application, or 1.5SMC39CA-E3/9AT equivalent, key selection criteria include bidirectional clamping capability, low incremental surge resistance, MSL Level 1 moisture sensitivity, RoHS-compliant matte tin plating, 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 enables fast response time (<1 ns) and stable clamping under repetitive 10/1000 µs surges at 0.01% duty cycle. The device is rated for -65 °C to +150 °C operating junction temperature and meets UL 497B recognition (QVGQ2) for protector classification.
Thermal performance is defined by RθJA = 75 °C/W (typ.) and RθJL = 15 °C/W (typ.), with derating applied above TA = 25 °C per Figure 2. It exhibits 0.100 %/°C temperature coefficient of VBR, ensuring predictable voltage drift across temperature, and supports unidirectional forward surge current up to 200 A (8.3 ms half-sine) only when used in unidirectional configuration - not applicable to this CA-suffix part.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 33.3 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown) | 37.1–41.0 V at 1 mA - Voltage at which device enters avalanche conduction; ensures reliable turn-on during transient events |
| VC (Clamping) | 53.9 V at 27.8 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; determines downstream component stress |
| PPPM | 1500 W - Peak pulse power handling capacity; validates robustness against lightning-induced or inductive-switching transients |
| IPPM | 27.8 A - Maximum non-repetitive peak pulse current; sets minimum PCB trace width and layout thermal design requirements |
| TJ max. | +150 °C - Maximum junction temperature; constrains ambient operating range and heatsinking needs in enclosed environments |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 0.305" × 0.320" footprint; compatible with JEDEC MS-013AC and automated pick-and-place |
Pinout & Package
1.5SMC39CA-E3/9AT uses the SMC (DO-214AB) package: molded epoxy case with matte tin-plated leads, UL 94 V-0 flammability rating, and no polarity marking (bidirectional). Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per Figure 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche terminals | No functional distinction between terminals; either lead may connect to line or ground - enables single-component protection of AC or differential signals |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-earth) without cascaded protection stages |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage exposure to downstream ICs while maintaining margin above VWM |
| MSL Level 1 (260 °C peak reflow) | Enables standard lead-free reflow soldering without pre-baking or special handling |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity stress |
| RoHS-compliant, halogen-free option available | Meets IPC-1752A material declaration requirements for automotive and industrial OEMs |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and chassis ground to shunt transient energy before it reaches sensitive analog front-ends. Use Value: Withstands 1500 W surges while limiting voltage to ≤53.9 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. |
Use Scenario: Safeguarding 4–20 mA current loop inputs and RS-485 transceivers in factory automation PLC modules exposed to motor switching noise. IC Role / Device Role / Timing Role: Fast-response transient suppressor installed across differential pair or line-to-ground to clamp EFT bursts and inductive kickback. Use Value: Sub-1 ns response time and 27.8 A IPPM ensure suppression occurs before transceiver input stages are overstressed during 2 kV ESD contact discharge. |
| Consumer Power Adapter Input Stage | Telecom DSL Line Card Surge Protection |
Use Scenario: Secondary-side overvoltage protection in AC/DC adapters for smart home devices subjected to mains-borne surges. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across DC output rails to clamp flyback transformer overshoot and external surge coupling. Use Value: 33.3 V VWM provides 20% margin above nominal 24 V output, while 53.9 V VC prevents regulator latch-up during 1.2/50 µs transients. |
Use Scenario: Primary protection for ADSL/VDSL line interface ICs connected to outside plant wiring vulnerable to lightning-induced surges. IC Role / Device Role / Timing Role: First-stage bidirectional suppressor mounted at RJ-11 jack entry point to divert common-mode surges before hybrid transformer. Use Value: 1500 W PPPM and symmetrical clamping enable compliance with ITU-T K.21 Basic Protection Level (10/700 µs, 4 kV) without series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Lower PPPM (600 W), smaller SMB package (DO-214AA), VC = 53.3 V at 11.8 A | Reduced surge handling; suitable only for lower-energy threats (IEC 61000-4-5 Level 2) | Select when board space is constrained and surge threat level is limited to <1 kV line-to-ground |
| 1.5KE39CA | Through-hole TO-218 package, same VWM/VBR/VC, but higher RθJA (60 °C/W) and no MSL rating | Requires wave soldering; incompatible with fully SMT production and high-density layouts | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ33CA and 1.5KE39CA, the 1.5SMC39CA-E3/9AT delivers higher surge robustness in an MSL Level 1 SMT package, enabling automated manufacturing and superior thermal performance on standard PCB copper areas - critical for automotive and industrial applications demanding repeatable surge immunity.
Availability
1.5SMC39CA-E3/9AT is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface protection, and telecom DSL line card surge protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1.5SMC39CA-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, TVS, and optoelectronics with emphasis on reliability, power efficiency, and AEC-Q qualification.
The 1.5SMC Series was developed for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where compact size, high surge rating, and process compatibility are essential.
FAQ
What does the "CA" suffix mean in 1.5SMC39CA-E3/9AT?
The "CA" suffix in 1.5SMC39CA-E3/9AT indicates a bidirectional configuration - meaning the device provides symmetrical transient suppression in both polarities without cathode/anode distinction. Unlike "A"-suffix unidirectional parts, the 1.5SMC39CA-E3/9AT has no band marking and is used where AC signals, differential lines, or undefined polarity require equal clamping in positive and negative directions.
Is 1.5SMC39CA-E3/9AT RoHS-compliant and lead-free?
Yes, the "E3" suffix in 1.5SMC39CA-E3/9AT denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads. It meets JESD 201 Class 2 whisker resistance and is qualified for lead-free reflow soldering with a maximum peak temperature of 260 °C (MSL Level 1), per the Vishay 88303 datasheet.
What is the maximum clamping voltage of 1.5SMC39CA-E3/9AT under surge conditions?
The maximum clamping voltage (VC) of 1.5SMC39CA-E3/9AT is 53.9 V at 27.8 A peak pulse current with a 10/1000 µs waveform. This value is measured per Figure 1 and Table 1 of the Vishay 88303 datasheet and represents the highest voltage imposed on the protected circuit during worst-case transient events.
Can 1.5SMC39CA-E3/9AT be used in automotive applications?
Yes - while the base 1.5SMC39CA-E3/9AT is commercial grade, the 1.5SMC39CAHE3_A variant is AEC-Q101 qualified for automotive use. The 1.5SMC39CA-E3/9AT itself shares identical electrical and thermal specs and is widely deployed in non-safety-critical automotive subsystems such as infotainment power rails and body control module sensor interfaces.
How does the SMC (DO-214AB) package of 1.5SMC39CA-E3/9AT compare to SMB (DO-214AA)?
The SMC package of 1.5SMC39CA-E3/9AT measures 0.305" × 0.320" (7.75 mm × 8.13 mm), offering ~2.3× higher power dissipation than SMB (0.205" × 0.155") due to larger copper pad area and lower thermal resistance (RθJA = 75 °C/W vs. ~100 °C/W for SMB). This enables 1.5SMC39CA-E3/9AT to sustain 1500 W surges where SMBJ33CA is limited to 600 W.
1.5SMC39CA-E3/9AT 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-E3/9AT FAQ
1.How can I place an order for 1.5SMC39CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC39CA-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 1.5SMC39CA-E3/9AT reliable?
The price and inventory of 1.5SMC39CA-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 1.5SMC39CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC39CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC39CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC39CA-E3/9AT?
1.5SMC39CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC39CA-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 1.5SMC39CA-E3/9AT?
For technical support, including 1.5SMC39CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC39CA-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC39CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC39CA-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 1.5SMC39CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC39CA-E3/9AT?
All 1.5SMC39CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC39CA-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 1.5SMC39CA-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC39CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC39CA-E3/9AT Tags
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