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Vishay General Semiconductor - Diodes Division 1.5SMC39AHE3/9AT
- Part No.:
- 1.5SMC39AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC39AHE3/9AT.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,372
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Product details
Overview
1.5SMC39AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 1500 W peak pulse power (10/1000 μs), 33.3 V standoff voltage, and 53.9 V clamping voltage at 27.8 A peak pulse current. It protects sensitive ICs and MOSFETs in automotive power supplies and industrial sensor interfaces.
For engineers reviewing the 1.5SMC39AHE3/9AT datasheet, 1.5SMC39AHE3/9AT pinout, 1.5SMC39AHE3/9AT application, or 1.5SMC39AHE3/9AT equivalent, this part delivers AEC-Q101 qualification, low incremental surge resistance, fast response time, and MSL Level 1 moisture sensitivity - critical for automotive-grade ESD and lightning transient suppression in production designs.
Technical Context
The 1.5SMC39AHE3/9AT operates as a unidirectional avalanche diode with glass-passivated junction, enabling precise reverse breakdown at 37.1–41.0 V (tested at 1 mA). Its thermal resistance is 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-leads), supporting reliable operation up to 150 °C junction temperature under pulsed conditions.
It meets UL 497B recognition (QVGQ2) and JESD201 Class 2 whisker resistance. The cathode band identifies polarity, and its matte tin-plated leads comply with J-STD-002 and JESD22-B102 solderability standards - essential for automated SMT assembly in high-reliability automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 1500 W - sustains high-energy transients without failure in automotive load-dump or inductive switching events |
| Standoff Voltage (VWM) | 33.3 V - maximum continuous reverse operating voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 37.1–41.0 V at 1 mA - defines the onset of controlled avalanche conduction during overvoltage |
| Clamping Voltage (VC) | 53.9 V at 27.8 A - limits downstream circuit voltage during surge, protecting 3.3 V/5 V logic and gate drivers |
| Peak Pulse Current (IPPM) | 27.8 A - maximum non-repetitive surge current it can safely divert without degradation |
| Junction Temperature Range | −65 °C to +150 °C - supports operation in under-hood automotive environments and industrial enclosures |
| Moisture Sensitivity Level | MSL Level 1 (per J-STD-020) - no floor life limitation; safe for standard reflow without baking |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads. Cathode identified by black band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional TVS configuration |
| Cathode | Avalanche conduction terminal | Connected to protected line (e.g., 33 V supply rail); clamps when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power rails |
| Glass passivated junction | Ensures stable breakdown voltage and long-term reliability under thermal cycling |
| 1500 W peak pulse rating | Handles ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surges without derating |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream components during transient events |
| UL 497B recognized (QVGQ2) | Meets safety requirements for telecom and industrial signal-line protectors |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 33 V CAN transceiver power input against load dump transients in vehicle body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VCC and GND, clamping surges above 33.3 V before they reach the transceiver IC. Use Value: Prevents latch-up or permanent damage to CAN PHY during 12 V/24 V system load dump events per ISO 7637-2. |
Use Scenario: Safeguarding analog output lines (4–20 mA) of pressure sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: TVS connected across signal and return lines to suppress ESD and inductive kickback from solenoid actuation. Use Value: Maintains signal integrity and prevents false triggering or ADC saturation during 8 kV contact ESD events (IEC 61000-4-2). |
| Telecom DC Power Input Protection | Consumer Power Adapter Output Protection |
Use Scenario: Shielding 36 V DC input of PoE-powered network switches from lightning-induced surges on outdoor Ethernet cables. IC Role / Device Role / Timing Role: Primary TVS on DC input rail, coordinated with upstream gas discharge tube for multi-stage protection. Use Value: Limits transient voltage to ≤53.9 V, preserving DC-DC controller and PMIC functionality during IEC 61000-4-5 10/700 μs surges. |
Use Scenario: Securing 33 V output of laptop AC/DC adapters against accidental short-circuit transients and plug-in surges. IC Role / Device Role / Timing Role: Final-stage TVS on secondary-side output, placed adjacent to connector to minimize trace inductance. Use Value: Enables compliance with UL 62368-1 surge immunity requirements while maintaining tight output regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Lower PPPM (400 W), smaller SMA package (DO-214AC), VWM = 33 V, VC = 53.3 V at 7.5 A | Not AEC-Q101 qualified; suitable for commercial-grade consumer electronics only | Select when cost and board space are prioritized over automotive qualification and surge robustness |
| 1.5KE39A | Through-hole TO-204AA (DO-41), same VWM/VC specs but higher RθJA (100 °C/W), no AEC-Q101 | Limited to non-automated, low-volume industrial repairs or legacy designs | Choose only if SMT assembly is unavailable and mechanical mounting is acceptable |
Compared with SMAJ33A-E3/57T and 1.5KE39A, the 1.5SMC39AHE3/9AT provides superior surge handling (1500 W vs. 400 W or 1500 W with inferior thermal performance), AEC-Q101 validation, and optimized SMT manufacturability - making it the preferred choice for new automotive and industrial designs requiring long-term supply stability and high-reliability surge immunity.
Availability
1.5SMC39AHE3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power inputs, and consumer adapter outputs requiring stable component supply, AEC-Q101 compliance, and high-energy transient suppression.
Supply support for 1.5SMC39AHE3/9AT 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, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The 1.5SMC Series was developed specifically for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, consistency, and AEC-Q101 compliance are mandatory.
FAQ
What is the standoff voltage (VWM) of the 1.5SMC39AHE3/9AT?
The 1.5SMC39AHE3/9AT has a standoff voltage (VWM) of 33.3 V, meaning it remains in high-impedance state below this reverse voltage, allowing normal circuit operation while blocking leakage current (<1 μA). This value ensures compatibility with 33 V nominal systems such as automotive body electronics and industrial 36 V DC rails.
Is the 1.5SMC39AHE3/9AT AEC-Q101 qualified?
Yes, the 1.5SMC39AHE3/9AT is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation (Document Number 88303, Revision 09-Mar-2026). This qualification validates its reliability for automotive applications including powertrain, chassis, and ADAS subsystems under extended temperature and lifetime stress conditions.
What is the clamping voltage (VC) of the 1.5SMC39AHE3/9AT at rated peak pulse current?
The 1.5SMC39AHE3/9AT clamps to 53.9 V at its rated peak pulse current of 27.8 A (10/1000 μs waveform). This clamping voltage defines the maximum voltage seen by protected circuitry during surge events, ensuring compatibility with 3.3 V, 5 V, and 33 V ICs when properly laid out with minimal trace inductance.
What package does the 1.5SMC39AHE3/9AT use, and is it RoHS-compliant?
The 1.5SMC39AHE3/9AT uses the SMC (DO-214AB) surface-mount package and is RoHS-compliant, as indicated by the "HE3" suffix per Vishay's ordering nomenclature. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the molding compound complies with UL 94 V-0 flammability rating.
How does the 1.5SMC39AHE3/9AT differ from bidirectional variants like 1.5SMC39CA?
The 1.5SMC39AHE3/9AT is unidirectional, with polarity marked by a cathode band and intended for DC rail protection where reverse voltage is blocked. In contrast, 1.5SMC39CA is bidirectional, symmetric in both directions, and used for AC lines or data signals. They share identical VWM, VBR, and VC values but differ in polarity behavior and application scope - the 1.5SMC39AHE3/9AT must not be substituted for bidirectional use without circuit redesign.
1.5SMC39AHE3/9AT 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:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC39AHE3/9AT FAQ
1.How can I place an order for 1.5SMC39AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC39AHE3/9AT 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 1.5SMC39AHE3/9AT reliable?
The price and inventory of 1.5SMC39AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC39AHE3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC39AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC39AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC39AHE3/9AT?
1.5SMC39AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC39AHE3/9AT 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 1.5SMC39AHE3/9AT?
For technical support, including 1.5SMC39AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC39AHE3/9AT requirements.
6.How does Aetrix verify that 1.5SMC39AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC39AHE3/9AT 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 1.5SMC39AHE3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC39AHE3/9AT?
All 1.5SMC39AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC39AHE3/9AT, 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 1.5SMC39AHE3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC39AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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