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Vishay General Semiconductor - Diodes Division 1.5SMC39A-E3/9AT
- Part No.:
- 1.5SMC39A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC39A-E3/9AT.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,303
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Product details
Overview
1.5SMC39A-E3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 39 V breakdown voltage (VBR = 37.1–41.0 V at 1 mA), 33.3 V stand-off voltage (VWM), clamps to ≤53.9 V at 27.8 A peak pulse current, and delivers 1500 W peak pulse power with a 10/1000 µs waveform - used in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the 1.5SMC39A-E3/9AT datasheet, 1.5SMC39A-E3/9AT pinout, 1.5SMC39A-E3/9AT application, or 1.5SMC39A-E3/9AT equivalent, key selection criteria include unidirectional polarity, SMC (DO-214AB) package compatibility, clamping performance under repetitive surge conditions, and AEC-Q101 qualification eligibility via HE3/HM3 variants.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (>1 µA leakage at 33.3 V), then rapidly avalanches when transient voltage exceeds VBR, diverting surge current away from downstream ICs. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Designed for surface-mount automated assembly, it meets J-STD-020 MSL Level 1 (260 °C peak reflow), supports 200 A non-repetitive forward surge (8.3 ms half-sine), and maintains operation across –65 °C to +150 °C junction temperature range - critical for under-hood automotive and factory-floor industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - defines precise avalanche initiation threshold for reliable overvoltage triggering |
| VWM | 33.3 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | ≤53.9 V at 27.8 A - clamping voltage during 1500 W 10/1000 µs surge, limiting stress on protected circuitry |
| PPPM | 1500 W - peak pulse power handling capability per standard 10/1000 µs waveform, duty cycle ≤0.01 % |
| IFSM | 200 A - single half-sine surge rating (8.3 ms), supporting high-energy inductive switch-off events |
| TJ max | +150 °C - enables deployment in high-temperature environments without derating concerns |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal relief |
Pinout & Package
Package: SMC (DO-214AB), molded epoxy case meeting UL 94 V-0 flammability rating; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes conduction path during avalanche |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail); band-marked end defines polarity for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables protection against severe transients like ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems |
| Glass-passivated junction | Ensures long-term stability of VBR and low parameter drift across temperature and lifetime |
| MSL Level 1 moisture sensitivity | Allows direct placement into reflow ovens without baking, reducing manufacturing overhead |
| AEC-Q101 qualification option | HE3/HM3 variants support automotive-grade reliability validation for safety-critical ECUs and sensors |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD or inductive kick) |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and jump-start surges in vehicle chassis modules. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between signal line and ground, activated within <1 ns upon exceeding VWM. Use Value: Clamps 1500 W surges to ≤53.9 V, preventing damage to 3.3 V/5 V interface ICs while maintaining signal integrity during normal operation. |
Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to 24 V DC field wiring with inductive load switching noise. IC Role / Device Role / Timing Role: Standoff-rated protector on each channel's input node, absorbing repetitive 10/1000 µs transients induced by solenoid de-energization. Use Value: With 33.3 V VWM, it blocks normal 24 V operation while responding to >37 V spikes - eliminating false triggers and extending input stage MTBF. |
| Telecom Power Rail Protection | Consumer Appliance Motor Control |
|
Use Scenario: Securing 48 V PoE-powered Ethernet switch ports against lightning-induced surges entering via data lines or auxiliary power feeds. IC Role / Device Role / Timing Role: Primary-level TVS on DC input rail upstream of DC/DC converters, coordinated with secondary-side protection. Use Value: 1500 W rating handles multi-kV surge energy per IEC 61000-4-5 Level 4, enabling compliance without cascaded protection stages. |
Use Scenario: Shielding microcontroller GPIOs and gate drivers in washing machine motor control boards from back-EMF generated by universal motor commutation. IC Role / Device Role / Timing Role: Unidirectional clamp on low-side MOSFET source or driver supply rail, referenced to system ground. Use Value: 200 A IFSM withstands repeated 8.3 ms motor turn-off events, avoiding degradation after thousands of cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A-E3/52T | Lower PPPM (600 W), smaller SMB package (DO-214AA), VWM = 36 V, VC = 58.1 V @ 10.3 A | Reduced surge margin; suitable only for lower-energy threats (e.g., ESD, minor inductive spikes) | Select when board space is constrained and threat level is limited to IEC 61000-4-2/4-4; not recommended for load dump or lightning. |
| 1.5KE39A-T | Through-hole TO-204AE (DO-41) package, same VBR/VWM, but higher VC (60 V), lower IPPM (25 A), and no MSL rating | Not compatible with SMT production; lacks reflow suitability and automotive qualification path | Choose only for legacy through-hole designs or prototyping where automated assembly is not required. |
Compared with SMBJ36A-E3/52T and 1.5KE39A-T, the 1.5SMC39A-E3/9AT provides superior surge handling (1500 W vs. 600 W or ~800 W), SMT manufacturability, and thermal performance in the SMC package - making it optimal for high-reliability, volume-production applications demanding repeatable clamping and AEC-Q101 scalability.
Availability
1.5SMC39A-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom power supplies, and consumer appliance motor controls requiring stable component supply across extended production lifecycles.
Supply support for 1.5SMC39A-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, efficiency, and application-specific optimization.
The 1.5SMC Series was engineered for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact size, repeatable clamping, and AEC-Q101 readiness are mandatory.
FAQ
What is the standoff voltage rating of the 1.5SMC39A-E3/9AT?
The 1.5SMC39A-E3/9AT has a maximum reverse stand-off voltage (VWM) of 33.3 V, meaning it remains non-conductive with leakage current ≤1 µA up to this DC or RMS voltage. This value ensures compatibility with nominal 24 V and 28 V systems while providing sufficient margin below its 37.1–41.0 V breakdown range.
Is the 1.5SMC39A-E3/9AT RoHS-compliant and halogen-free?
Yes, the 1.5SMC39A-E3/9AT carries the "E3" suffix, indicating full RoHS compliance per EU Directive 2011/65/EU. It is not halogen-free; for halogen-free and RoHS-compliant versions, specify the "M3" suffix (e.g., 1.5SMC39A-M3/9AT).
Does the 1.5SMC39A-E3/9AT meet AEC-Q101 requirements?
The base 1.5SMC39A-E3/9AT is commercial-grade and not AEC-Q101 qualified. However, Vishay offers AEC-Q101-qualified variants under the HE3 (RoHS + AEC-Q101) and HM3 (halogen-free + RoHS + AEC-Q101) suffixes - these require separate ordering codes such as 1.5SMC39AHE3_A/I.
What is the thermal resistance of the 1.5SMC39A-E3/9AT?
The 1.5SMC39A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended 8.0 mm × 8.0 mm copper pads. Its junction-to-lead resistance (RθJL) is 15 °C/W, supporting efficient heat transfer to PCB copper in high-surge applications.
How does the 1.5SMC39A-E3/9AT differ from bidirectional TVS diodes like 1.5SMC39CA?
The 1.5SMC39A-E3/9AT is unidirectional and intended for DC line protection with defined polarity (cathode band). In contrast, 1.5SMC39CA is bidirectional, symmetric in both directions, and used for AC or differential signal protection (e.g., RS-485). They share identical VBR, VC, and PPPM, but cannot be substituted without verifying circuit polarity and signal type.
1.5SMC39A-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:
- 1
- Bidirectional Channels:
- -
- 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)
1.5SMC39A-E3/9AT FAQ
1.How can I place an order for 1.5SMC39A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC39A-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 1.5SMC39A-E3/9AT reliable?
The price and inventory of 1.5SMC39A-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 1.5SMC39A-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC39A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC39A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC39A-E3/9AT?
1.5SMC39A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC39A-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 1.5SMC39A-E3/9AT?
For technical support, including 1.5SMC39A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC39A-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC39A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC39A-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 1.5SMC39A-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC39A-E3/9AT?
All 1.5SMC39A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC39A-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 1.5SMC39A-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC39A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC39A-E3/9AT Tags
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