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Vishay General Semiconductor - Diodes Division 1.5SMC51A-E3/9AT
- Part No.:
- 1.5SMC51A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51A-E3/9AT.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,766
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Product details
Overview
1.5SMC51A-E3/9AT 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 1 mA), 43.6 V stand-off voltage (VWM), clamps transients to ≤70.1 V at 21.4 A peak pulse current (10/1000 µs), and delivers 1500 W peak pulse power. It is widely deployed to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the 1.5SMC51A-E3/9AT datasheet, 1.5SMC51A-E3/9AT pinout, 1.5SMC51A-E3/9AT application, or 1.5SMC51A-E3/9AT equivalent, key selection criteria include unidirectional polarity, SMC (DO-214AB) package compatibility, clamping performance under 10/1000 µs surges, thermal resistance (RθJA = 75 °C/W), and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM (43.6 V), it transitions from high-impedance blocking to low-impedance conduction, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable avalanche behavior and fast response (<1 ns).
The device is rated for 1500 W peak pulse power (10/1000 µs waveform, 0.01% duty cycle), supports 200 A non-repetitive forward surge (8.3 ms half-sine), and maintains operation across –65 °C to +150 °C junction temperature. Its low incremental surge resistance enables effective energy absorption without excessive voltage overshoot during transient events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1 mA - defines precise avalanche initiation threshold for reliable overvoltage triggering |
| VWM | 43.6 V - maximum continuous reverse operating voltage before leakage rises significantly |
| VC @ IPPM | ≤70.1 V at 21.4 A - clamping voltage under full 1500 W surge, limiting stress on protected ICs |
| PPPM | 1500 W - peak transient power handling capability with standard 10/1000 µs waveform |
| IPPM | 21.4 A - maximum non-repetitive peak pulse current the device safely conducts |
| TJ max | +150 °C - maximum junction temperature enabling use in under-hood automotive and high-ambient industrial environments |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, guiding PCB copper pad sizing for thermal management |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band; anode and cathode terminals are axially aligned along the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal | Connected to protected line; conducts avalanche current to ground during overvoltage |
| Anode | Reference/ground terminal | Typically tied to system ground or low-impedance return path to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables protection against severe lightning-induced or inductive-switching transients in 24 V/48 V systems |
| Glass-passivated chip junction | Ensures stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture-related popcorning or delamination |
| AEC-Q101 qualification option (HE3/HM3) | Validates suitability for automotive powertrain and chassis applications requiring zero-defect reliability |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed industrial and transportation equipment |
Applications
| Automotive Power Supply Protection | Industrial PLC I/O Module Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power rails in engine control units (ECUs) and body control modules (BCMs) from load dump and ISO 7637-2 pulses. IC Role / Device Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp transients before they reach sensitive regulators. Use Value: Limits clamped voltage to ≤70.1 V, preventing damage to 40 V-rated input stages of buck controllers and microcontrollers. |
Use Scenario: Safeguarding analog input channels (e.g., 4–20 mA loops) in programmable logic controllers against field-wiring induced surges and ESD. IC Role / Device Role: Shunt protector mounted at connector entry point, routing surge current to chassis ground before reaching precision op-amps and ADC front-ends. Use Value: Fast <1 ns response and low clamping voltage preserve signal integrity and prevent latch-up in measurement circuits. |
| Telecom DC Power Feeding Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Securing -48 V DC feeding lines in base station power distribution units exposed to lightning-induced common-mode surges. IC Role / Device Role: Unidirectional TVS on the negative rail, referenced to system ground, absorbing differential-mode transients from coupled AC mains or antenna cables. Use Value: 1500 W rating handles high-energy surges while maintaining VC below -58 V absolute maximum ratings of telecom rectifier ICs. |
Use Scenario: Shielding H-bridge gate drivers and current-sense amplifiers in washing machine motor inverters from back-EMF spikes during commutation. IC Role / Device Role: Mounted across DC bus or at driver supply pins to clamp inductive kickback from brushless DC motors. Use Value: 200 A IFSM rating withstands repetitive 8.3 ms surges, extending lifetime of MOSFETs and isolated gate drivers. |
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-E3/52T | Lower peak power (600 W), SMB (DO-214AA) package, same VBR range and unidirectional polarity | Not suitable for 1500 W surge environments; limited to lower-energy IEC 61000-4-5 level 3 or ESD-only protection | Select only if board space is constrained and surge threat level is ≤600 W; verify thermal derating on smaller pads |
| 1.5KE51A | Through-hole DO-201 package, identical electrical specs but higher RθJA (~50 °C/W on large pads), no RoHS-compliant E3 suffix standard | Requires wave soldering or hand assembly; incompatible with automated SMT lines using 13" tape reels | Choose for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ51A-E3/52T and 1.5KE51A, the 1.5SMC51A-E3/9AT uniquely balances 1500 W surge capacity, SMC's optimized thermal performance (RθJA = 75 °C/W), and RoHS-compliant 13" tape-and-reel packaging-making it the preferred choice for high-reliability, volume-manufactured automotive and industrial SMT assemblies.
Availability
1.5SMC51A-E3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom power feeds, and consumer appliance motor drives requiring stable component supply, consistent RoHS compliance, and support for high-volume SMT placement.
Supply support for 1.5SMC51A-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 devices, and optoelectronics with emphasis on reliability, power handling, and automotive-grade qualification.
The 1.5SMC Series was developed to deliver high-power, surface-mount transient suppression for harsh-environment applications-particularly where space-constrained layouts demand robust 1500 W surge immunity without compromising thermal or assembly performance.
FAQ
What is the breakdown voltage tolerance for 1.5SMC51A-E3/9AT?
The 1.5SMC51A-E3/9AT has a specified breakdown voltage (VBR) range of 48.5 V to 53.6 V at 1 mA test current, representing ±5.2% tolerance around the nominal 51 V rating. This tight tolerance ensures predictable clamping onset across production lots and supports precise overvoltage margining in safety-critical designs.
Is 1.5SMC51A-E3/9AT RoHS-compliant and halogen-free?
Yes, the "E3" suffix in 1.5SMC51A-E3/9AT denotes full RoHS compliance per EU Directive 2011/65/EU. However, it is not halogen-free; for halogen-free and RoHS-compliant versions, specify the "M3" suffix (e.g., 1.5SMC51A-M3/9AT), which meets IEC 61249-2-21 requirements.
Can 1.5SMC51A-E3/9AT be used in bidirectional configurations?
No, 1.5SMC51A-E3/9AT is strictly unidirectional. For bidirectional transient suppression at the same voltage rating, use 1.5SMC51CA-E3/9AT-the "CA" suffix indicates symmetrical breakdown in both polarities, with VBR = 48.5–53.6 V and VWM = 43.6 V in either direction.
What is the maximum clamping voltage of 1.5SMC51A-E3/9AT under surge conditions?
The maximum clamping voltage (VC) of 1.5SMC51A-E3/9AT is 70.1 V at its rated peak pulse current of 21.4 A (10/1000 µs waveform). This value is guaranteed across temperature and represents the upper limit of voltage imposed on protected circuitry during worst-case transient events.
Does 1.5SMC51A-E3/9AT meet AEC-Q101 qualification?
The base 1.5SMC51A-E3/9AT is commercial-grade and not AEC-Q101 qualified. To obtain automotive-qualified versions, select part numbers with "HE3" (RoHS-compliant + AEC-Q101) or "HM3" (halogen-free + RoHS + AEC-Q101) suffixes-for example, 1.5SMC51AHE3_A/I-ensuring compliance with stress testing for automotive powertrain and chassis applications.
1.5SMC51A-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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC51A-E3/9AT FAQ
1.How can I place an order for 1.5SMC51A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51A-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 1.5SMC51A-E3/9AT reliable?
The price and inventory of 1.5SMC51A-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 1.5SMC51A-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC51A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51A-E3/9AT?
1.5SMC51A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51A-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 1.5SMC51A-E3/9AT?
For technical support, including 1.5SMC51A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51A-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC51A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51A-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 1.5SMC51A-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC51A-E3/9AT?
All 1.5SMC51A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51A-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 1.5SMC51A-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC51A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51A-E3/9AT Tags
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