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Vishay General Semiconductor - Diodes Division 1.5SMC39A-E3/57T
- Part No.:
- 1.5SMC39A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC39A-E3/57T.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:1,939
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Product details
Overview
1.5SMC39A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 39 V breakdown voltage (VBR = 37.1–41.0 V at 1.0 mA), 33.3 V stand-off voltage (VWM), clamps to ≤53.9 V at 27.8 A peak pulse current (10/1000 μs), and delivers 1500 W peak pulse power. It is widely deployed in automotive sensor interfaces and industrial power supply rails.
For engineers reviewing the 1.5SMC39A-E3/57T datasheet, 1.5SMC39A-E3/57T pinout, 1.5SMC39A-E3/57T application, or 1.5SMC39A-E3/57T equivalent, key selection criteria include clamping voltage under surge, unidirectional polarity marking, SMC (DO-214AB) package thermal performance, and AEC-Q101 qualification path via HE3 suffix variants.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches rapidly (<1 ns response) to divert transient energy away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and long-term reliability under repetitive surges.
Thermally, it uses the SMC (DO-214AB) package with RθJA = 75 °C/W and RθJL = 15 °C/W, enabling effective heat dissipation on standard 8.0 mm × 8.0 mm copper pads. The cathode band denotes polarity, and it meets J-STD-020 MSL Level 1 (260 °C peak reflow).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - defines precise avalanche onset threshold for repeatable clamping behavior |
| VWM | 33.3 V - maximum continuous reverse operating voltage before leakage rises significantly |
| VC @ IPPM | ≤53.9 V at 27.8 A (10/1000 μs) - actual worst-case clamping voltage seen by protected circuit during surge |
| PPPM | 1500 W - peak transient power handling capability under standardized lightning/surge waveform |
| IFSM | 200 A (8.3 ms half-sine) - surge current rating for unidirectional forward conduction during fault events |
| Junction Temp | -65 °C to +150 °C - operational range compatible with under-hood automotive and industrial ambient conditions |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 0.320" body length and matte tin leads |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with glass-passivated chip junction. Cathode indicated by molded band; anode is unmarked end. Meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage event |
| Anode (unmarked end) | Reference/return path | Typically tied to system ground or lower-potential rail; completes shunt path for surge diversion |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without derating on standard PCB pads |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot across protected ICs, preserving margin for 3.3 V or 5 V logic interfaces |
| Glass-passivated junction | Ensures stable leakage (<1 μA at VWM) and immunity to humidity-induced parameter drift over 10+ year field life |
| MSL Level 1 (260 °C) | Supports standard lead-free reflow profiles without preconditioning or special handling requirements |
| RoHS-compliant, halogen-free option (M3 suffix) | Meets EU ELV and JEDEC JS709C material restrictions for automotive and industrial OEM compliance |
Applications
| Automotive Sensor Interface Protection | Industrial DC Power Rail Clamping |
|---|---|
|
Use Scenario: Protecting CAN/LIN transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between signal line and chassis ground, responding within <1 ns to clamp transients above 33.3 V. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V interface ICs by limiting voltage to ≤53.9 V during 27.8 A surge events. |
Use Scenario: Safeguarding 24 V industrial PLC I/O modules and motor drive control inputs against inductive switching spikes and lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V supply rail input, placed upstream of LDOs and microcontrollers. Use Value: Absorbs 1500 W transient energy without failure, maintaining system uptime where replacement downtime incurs high cost. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Stage |
|
Use Scenario: Front-end protection for Ethernet PHYs and PoE injectors exposed to induced surges on twisted-pair cabling per IEC 61000-4-5. IC Role / Device Role / Timing Role: Unidirectional TVS on DC bias line of active Ethernet port, referenced to local ground plane. Use Value: Delivers consistent clamping performance across temperature (-65 °C to +150 °C), critical for outdoor telecom cabinets. |
Use Scenario: Secondary-side transient suppression in AC/DC adapters for smart home devices, guarding against mains-borne surges entering low-voltage output. IC Role / Device Role / Timing Role: Final-stage shunt device on 5 V/12 V output rail, complementing primary-side MOVs and Y-capacitors. Use Value: Provides fast-response, low-leakage clamping (≤1 μA) that avoids standby power budget violations in Energy Star-compliant designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ39A (Bourns) | Same VBR range (37.1–41.0 V), but SMB package (smaller footprint, higher RθJA = 85 °C/W) | Limited to ≤1000 W peak power; unsuitable for sustained 1500 W surges without thermal derating | Select when board space is constrained and surge duty cycle is low (<0.001 %); verify thermal pad area matches SMB layout |
| 1.5KE39A (Vishay, through-hole) | Identical electrical specs but DO-201AD package; 2.5× larger footprint and manual assembly requirement | Used in legacy designs or prototyping where reflow compatibility is not required | Choose only for backward compatibility or hand-soldered repair; not recommended for new SMT production |
Compared with SMBJ39A and 1.5KE39A, the 1.5SMC39A-E3/57T offers optimal balance of 1500 W surge capacity, SMT manufacturability, and thermal performance in the compact SMC outline-making it the preferred choice for high-reliability automotive and industrial production.
Availability
1.5SMC39A-E3/57T is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC power conditioning, and telecom line card protection requiring stable component supply and full RoHS compliance.
Supply support for 1.5SMC39A-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, and protection devices with emphasis on reliability, ruggedness, and automotive-grade qualification.
The 1.5SMC Series was engineered specifically for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising signal integrity or thermal stability.
FAQ
What is the clamping voltage of the 1.5SMC39A-E3/57T under maximum surge conditions?
The 1.5SMC39A-E3/57T clamps to a maximum of 53.9 V when subjected to its rated peak pulse current of 27.8 A using the standard 10/1000 μs waveform. This value is measured at the device terminals under defined test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and represents the upper limit of voltage imposed on the protected circuit during a surge event. Designers must ensure downstream components tolerate this clamped voltage with margin.
Is the 1.5SMC39A-E3/57T suitable for automotive applications?
Yes-the 1.5SMC39A-E3/57T is RoHS-compliant and part of the AEC-Q101-qualified 1.5SMC family; however, the specific -E3/57T variant is commercial grade. For automotive production, specify the HE3 or HM3 suffix (e.g., 1.5SMC39AHE3_A) which carries full AEC-Q101 qualification. The -E3/57T shares identical electrical and thermal characteristics but lacks the extended stress-test validation required for under-hood deployment.
How does the 1.5SMC39A-E3/57T differ from bidirectional TVS diodes like 1.5SMC39CA?
The 1.5SMC39A-E3/57T is unidirectional and features a cathode band for polarity-sensitive placement, allowing it to block forward voltage up to ~1.0 V while clamping reverse transients. In contrast, 1.5SMC39CA is bidirectional with symmetrical clamping in both directions and no polarity marking. Use the 1.5SMC39A-E3/57T where DC bias exists (e.g., power rails), and 1.5SMC39CA where AC-coupled or differential signals require protection without polarity constraints.
What is the maximum steady-state power dissipation of the 1.5SMC39A-E3/57T?
The 1.5SMC39A-E3/57T has a maximum steady-state power dissipation (PD) of 6.5 W when mounted on an infinite heatsink at TA = 50 °C. In typical PCB applications with 8.0 mm × 8.0 mm copper pads per terminal, derating applies above 25 °C ambient-consult Figure 2 in the Vishay datasheet (Doc. #88303) for exact thermal derating curves. Continuous DC power dissipation must remain well below this limit to avoid junction overheating.
Does the 1.5SMC39A-E3/57T require a heatsink for standard operation?
No external heatsink is required for the 1.5SMC39A-E3/57T under normal transient suppression use, as it handles energy in short pulses (≤1000 μs). However, proper PCB layout is essential: Vishay specifies mounting on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve the rated 1500 W pulse power and thermal resistance (RθJA = 75 °C/W). Reduced pad area will degrade surge capability and increase junction temperature.
1.5SMC39A-E3/57T 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-E3/57T FAQ
1.How can I place an order for 1.5SMC39A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC39A-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 1.5SMC39A-E3/57T reliable?
The price and inventory of 1.5SMC39A-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 1.5SMC39A-E3/57T is usually 5 days.
3.What payment methods are accepted for 1.5SMC39A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC39A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC39A-E3/57T?
1.5SMC39A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC39A-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 1.5SMC39A-E3/57T?
For technical support, including 1.5SMC39A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC39A-E3/57T requirements.
6.How does Aetrix verify that 1.5SMC39A-E3/57T is sourced from the original manufacturer or authorized distributors?
All 1.5SMC39A-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 1.5SMC39A-E3/57T meets industry standards.
7.What is the process for return or replacement of 1.5SMC39A-E3/57T?
All 1.5SMC39A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC39A-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 1.5SMC39A-E3/57T part is unused and in its original packaging.
Return procedure for 1.5SMC39A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC39A-E3/57T Tags
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