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Vishay General Semiconductor - Diodes Division 1.5SMC51AHE3/57T
- Part No.:
- 1.5SMC51AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51AHE3/57T.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,374
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Product details
Overview
1.5SMC51AHE3/57T 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 51 V breakdown voltage (VBR = 48.5–53.6 V at IT = 1.0 mA), 43.6 V stand-off voltage (VWM), 70.1 V maximum clamping voltage (VC) at 21.4 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive ECUs, industrial sensor interfaces, and DC power rails.
For engineers reviewing the 1.5SMC51AHE3/57T datasheet, 1.5SMC51AHE3/57T pinout, 1.5SMC51AHE3/57T application, or 1.5SMC51AHE3/57T equivalent, key selection criteria include unidirectional polarity, SMC (DO-214AB) package compatibility, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.61), and ≤1.0 µA reverse leakage at VWM.
Technical Context
The 1.5SMC51AHE3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering fast response (<1 ps) to transient events such as ESD, lightning-induced surges, and inductive switching spikes. Its unidirectional configuration enables integration into DC-biased circuits where polarity-sensitive clamping is required.
Thermally, it supports operation from −65 °C to +150 °C junction temperature, with RθJA = 75 °C/W (on 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, enabling reliable performance under repetitive surge conditions up to 0.01% duty cycle at 1500 W peak power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at IT = 1.0 mA - defines precise avalanche initiation threshold for consistent clamping onset |
| VWM | 43.6 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 70.1 V at 21.4 A - clamping voltage during 10/1000 µs surge, limiting downstream voltage stress |
| PPPM | 1500 W - peak pulse power handling capability under standardized surge waveform |
| IPPM | 21.4 A - maximum non-repetitive peak pulse current supported without degradation |
| TJ max. | +150 °C - maximum junction temperature enabling use in under-hood automotive and high-ambient industrial environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection in reverse-biased protection configuration | Connected to protected line; conducts during overvoltage to shunt current to ground |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane to complete clamping path |
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 |
| AEC-Q101 qualification | Confirms suitability for automotive powertrain, body control, and ADAS modules requiring long-term field reliability |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage over temperature and lifetime vs. epoxy-passivated alternatives |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Clamping |
|---|---|
|
Use Scenario: Protecting microcontroller power inputs in engine control units exposed to load dump transients up to 40 V for 400 ms. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V rail and ground, clamping surges before they reach LDOs or MCU VDD pins. Use Value: Withstands 1500 W pulses and maintains VC ≤ 70.1 V, keeping downstream 5 V regulators within safe input range. |
Use Scenario: Shielding analog outputs of pressure sensors in factory automation PLC I/O modules from EFT and surge coupling. IC Role / Device Role / Timing Role: TVS mounted at connector entry point on 0–10 V or 4–20 mA output traces to suppress fast transients. Use Value: Sub-nanosecond response and <1.0 µA leakage at 43.6 V preserve signal integrity and measurement accuracy. |
| DC-DC Converter Input Stage | Telecom Line Interface Protection |
|
Use Scenario: Safeguarding buck converter inputs in PoE-powered devices subjected to induced surges on Ethernet cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp ahead of input filter capacitor and controller IC. Use Value: 75 °C/W thermal resistance allows sustained operation at 6.5 W dissipation, supporting continuous fault clearing. |
Use Scenario: Front-end protection for RS-485 transceivers in outdoor base station backhaul links vulnerable to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Unidirectional TVS on VCC supply rail referenced to local ground, complementing bidirectional line protectors. Use Value: AEC-Q101 qualification ensures proven reliability in harsh outdoor telecom environments with wide temperature swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A-E3/52 | Same VBR range (48.5–53.6 V), but SMB package (DO-214AA); lower PPPM = 600 W | Limited to lower-energy transients; unsuitable for automotive load dump per ISO 7637-2 | Select when board space is constrained and surge energy is ≤600 W (e.g., consumer USB ports) |
| 1.5KE51A-T | Through-hole DO-201 package; identical electrical specs but no AEC-Q101 qualification | Not approved for automotive production; requires additional qualification effort for vehicle programs | Choose only for prototyping or non-automotive industrial use where SMT is not mandatory |
Compared with SMBJ51A-E3/52 and 1.5KE51A-T, the 1.5SMC51AHE3/57T uniquely combines AEC-Q101 qualification, 1500 W surge capacity, and SMC footprint - making it the only drop-in solution for volume automotive and high-reliability industrial designs requiring zero layout change and full compliance.
Availability
1.5SMC51AHE3/57T is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and telecom power rail hardening requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1.5SMC51AHE3/57T 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The 1.5SMC Series was developed to deliver high-power, AEC-Q101-qualified TVS protection in compact SMC packages for automotive and industrial power systems demanding repeatable clamping performance under extreme surge conditions.
FAQ
What is the clamping voltage of the 1.5SMC51AHE3/57T at its rated peak pulse current?
The 1.5SMC51AHE3/57T has a maximum clamping voltage (VC) of 70.1 V at its rated peak pulse current (IPPM) of 21.4 A, measured using the standard 10/1000 µs double-exponential waveform. This value ensures protected circuitry remains below critical overvoltage thresholds during surge events, and is verified per Vishay Document Number 88303, page 2.
Is the 1.5SMC51AHE3/57T qualified for automotive applications?
Yes, the 1.5SMC51AHE3/57T is AEC-Q101 qualified, as indicated by the "HE3" suffix per Vishay's ordering nomenclature. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD per JESD22 standards - confirming suitability for under-hood and chassis-mounted automotive modules.
What is the standoff voltage (VWM) and why does it matter for the 1.5SMC51AHE3/57T?
The 1.5SMC51AHE3/57T has a maximum working peak reverse voltage (VWM) of 43.6 V, meaning it remains non-conductive with ≤1.0 µA leakage up to this DC or RMS voltage. This parameter ensures the device does not interfere with normal circuit operation while providing margin below the 48.5 V minimum breakdown voltage - critical for stable 36–42 V automotive battery systems.
Does the 1.5SMC51AHE3/57T have a defined polarity, and how is it marked?
Yes, the 1.5SMC51AHE3/57T is unidirectional and marked with a cathode band on the SMC (DO-214AB) package body. The banded end is the cathode terminal and must be connected toward the side of the circuit being protected (e.g., to a 12 V rail), while the anode connects to ground - reversing polarity prevents proper clamping function.
What is the thermal resistance and maximum power dissipation of the 1.5SMC51AHE3/57T?
The 1.5SMC51AHE3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads, and a steady-state power dissipation (PD) rating of 6.5 W at TA = 50 °C. These values define safe continuous operation limits and inform heatsinking decisions for fault-clearing scenarios.
1.5SMC51AHE3/57T 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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 21.4A
- 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)
1.5SMC51AHE3/57T FAQ
1.How can I place an order for 1.5SMC51AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51AHE3/57T 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 1.5SMC51AHE3/57T reliable?
The price and inventory of 1.5SMC51AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51AHE3/57T is usually 5 days.
3.What payment methods are accepted for 1.5SMC51AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51AHE3/57T?
1.5SMC51AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51AHE3/57T 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 1.5SMC51AHE3/57T?
For technical support, including 1.5SMC51AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51AHE3/57T requirements.
6.How does Aetrix verify that 1.5SMC51AHE3/57T is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51AHE3/57T 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 1.5SMC51AHE3/57T meets industry standards.
7.What is the process for return or replacement of 1.5SMC51AHE3/57T?
All 1.5SMC51AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51AHE3/57T, 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 1.5SMC51AHE3/57T part is unused and in its original packaging.
Return procedure for 1.5SMC51AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51AHE3/57T Tags
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