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Vishay General Semiconductor - Diodes Division 1.5SMC51A-M3/57T
- Part No.:
- 1.5SMC51A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51A-M3/57T.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,175
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Product details
Overview
1.5SMC51A-M3/57T 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 1 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 sensor interfaces, industrial I/O protection, and DC power rail surge suppression.
For engineers reviewing the 1.5SMC51A-M3/57T datasheet, 1.5SMC51A-M3/57T pinout, 1.5SMC51A-M3/57T application, or 1.5SMC51A-M3/57T equivalent, key selection considerations include its unidirectional polarity, SMC (DO-214AB) package thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification eligibility (via HM3 suffix), halogen-free RoHS compliance, and clamping performance under repetitive 0.01% duty-cycle transients.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM (43.6 V), it avalanches near VBR (48.5–53.6 V) and limits transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown and low leakage (<1 µA at VWM), while the low incremental surge resistance enables fast response (<1 ns) and minimal overshoot during ESD or lightning-induced spikes.
The device is rated for 200 A non-repetitive forward surge (8.3 ms half-sine) and operates across –65 °C to +150 °C junction temperature. Mounted on 8.0 mm × 8.0 mm copper pads, it delivers full 1500 W pulse power capability and supports automated SMT placement per J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1 mA test current - defines precise avalanche initiation window for reliable triggering without false trips |
| VWM | 43.6 V - maximum continuous reverse operating voltage; ensures no conduction during normal DC bias |
| VC @ IPPM | 70.1 V at 21.4 A - clamping voltage under 1500 W 10/1000 µs surge; determines protected circuit's maximum transient stress |
| PPPM | 1500 W - peak pulse power handling capacity; validates suitability for IEC 61000-4-5 Level 4 (4 kV) surge events |
| IFSM | 200 A - 8.3 ms single half-sine forward surge rating; supports high-energy inductive switch-off protection |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive and industrial ambient environments |
| RθJA | 75 °C/W - thermal resistance junction-to-ambient on standard pad layout; informs derating above 25 °C ambient |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with matte tin-plated leads; meets UL 94 V-0 flammability and JESD201 Class 2 whisker resistance requirements. Polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse voltage reference | Connected to protected line's lower-potential side (e.g., GND or return path); defines unidirectional conduction direction |
| Cathode | Avalanche current sink / clamping node | Connected to protected line's higher-potential side (e.g., VIN, signal line); conducts surge current to ground when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity up to 4 kV in 2 Ω/12 Ω source impedance configurations |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during clamping, reducing stress on downstream MOSFETs, MCUs, or analog front-ends |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage current across temperature and lifetime, critical for automotive reliability |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance mandates for industrial and automotive OEM supply chains without compromising electrical performance |
| MSL Level 1 (260 °C peak reflow) | Supports lead-free SMT assembly without moisture sensitivity concerns or pre-bake requirements |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus 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, clamping transients within nanoseconds before IC damage occurs. Use Value: With VC = 70.1 V and 1500 W rating, it suppresses 12 V system load dump surges (up to 60 V) while maintaining signal integrity below 80 V threshold of typical 5 V/3.3 V receivers. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced surges (e.g., relay coil flyback, lightning coupling). IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input channels, mounted directly at connector entry point to minimize inductance. Use Value: 43.6 V VWM allows safe operation across 24 V ±15% nominal range; 70.1 V VC ensures connected optocouplers or Schmitt triggers remain undamaged during 1 kV/2 kV surge tests. |
| DC Power Rail Surge Suppression | Consumer Power Adapter Output Protection |
|
Use Scenario: Secondary-side overvoltage protection on switched-mode power supply outputs (e.g., 48 V telecom supplies, PoE PSE outputs). IC Role / Device Role / Timing Role: Fast-acting crowbar element that diverts fault current away from downstream regulators and connectors during output short-circuit or feedback failure. Use Value: 200 A IFSM rating withstands sustained overcurrent events; 1500 W PPPM handles repetitive switching transients without degradation. |
Use Scenario: Output line protection in USB PD and QC-compliant wall adapters to prevent transient propagation to connected devices during plug/unplug or ESD events. IC Role / Device Role / Timing Role: Final-stage TVS on 5–20 V output rails, positioned after filtering to avoid false triggering from ripple. Use Value: Low leakage (<1 µA at 43.6 V) prevents standby power loss; halogen-free M3 construction satisfies global eco-regulatory requirements for consumer electronics. |
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-M3/57T | Same VBR/VC specs but SMB package (lower PPPM = 600 W); RθJA = 85 °C/W | Limited to lower-energy transients (IEC 61000-4-5 Level 2); less suitable for automotive load dump | Select when board space is constrained and surge threat level is ≤1 kV; verify thermal margin with reduced pad area. |
| 1.5KE51A-E3/54 | Through-hole DO-201 package; identical electrical specs but higher RθJA (60 °C/W on infinite heatsink only); no MSL rating | Not compatible with automated SMT lines; requires wave soldering; unsuitable for high-density layouts | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with 1.5SMC51A-M3/57T, SMBJ51A-M3/57T trades 1500 W surge capacity for smaller footprint, while 1.5KE51A-E3/54 retains full power rating but sacrifices SMT manufacturability and moisture sensitivity control - making the 1.5SMC51A-M3/57T optimal for production-grade automotive and industrial SMT applications demanding both robustness and process compatibility.
Availability
1.5SMC51A-M3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and DC power rail surge suppression requiring stable component supply, halogen-free compliance, and AEC-Q101-qualified alternatives.
Supply support for 1.5SMC51A-M3/57T 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, TVS, MOSFETs, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The 1.5SMC Series is engineered for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, repeatable clamping, and SMT manufacturability are mandatory design criteria.
FAQ
What is the breakdown voltage tolerance for 1.5SMC51A-M3/57T?
The 1.5SMC51A-M3/57T has a specified breakdown voltage (VBR) range of 48.5 V to 53.6 V at 1 mA test current, representing a ±5.2% tolerance around the nominal 51 V rating. This tight distribution ensures consistent clamping behavior across production lots and supports predictable system-level surge margin calculations in designs using 1.5SMC51A-M3/57T.
Is 1.5SMC51A-M3/57T AEC-Q101 qualified?
The base part number 1.5SMC51A-M3/57T is halogen-free and RoHS-compliant but not inherently AEC-Q101 qualified. AEC-Q101 qualification is available under the HM3 suffix variant (e.g., 1.5SMC51AHM3_A/H). For automotive applications requiring qualification, users must specify the HM3 version - the 1.5SMC51A-M3/57T itself meets all electrical and mechanical specs but lacks the extended reliability testing documentation of the HM3 grade.
What is the maximum clamping voltage of 1.5SMC51A-M3/57T under surge conditions?
The 1.5SMC51A-M3/57T exhibits a maximum clamping voltage (VC) of 70.1 V when subjected to its rated peak pulse current of 21.4 A (10/1000 µs waveform). This value is guaranteed across temperature and represents the highest voltage seen at the device terminals during worst-case transient events - a critical parameter for ensuring downstream components like 75 V-rated MOSFETs or 5 V LDOs remain within safe operating limits when protected by 1.5SMC51A-M3/57T.
Can 1.5SMC51A-M3/57T be used in bidirectional configurations?
No, 1.5SMC51A-M3/57T is a unidirectional TVS diode, identifiable by its cathode band marking. Bidirectional operation requires the CA-suffixed variant (e.g., 1.5SMC51CA-M3/57T), which has symmetrical breakdown in both polarities. Using 1.5SMC51A-M3/57T in AC or floating signal paths risks forward conduction and failure; always match polarity to circuit topology when deploying 1.5SMC51A-M3/57T.
What is the thermal resistance of 1.5SMC51A-M3/57T in standard mounting conditions?
The 1.5SMC51A-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB material and natural convection cooling - designers must apply derating curves from Figure 2 of the datasheet to determine safe power dissipation above 25 °C ambient, especially in enclosed industrial enclosures where 1.5SMC51A-M3/57T may operate near its +150 °C TJ limit.
1.5SMC51A-M3/57T 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):
- 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-M3/57T FAQ
1.How can I place an order for 1.5SMC51A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51A-M3/57T 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 1.5SMC51A-M3/57T reliable?
The price and inventory of 1.5SMC51A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51A-M3/57T is usually 5 days.
3.What payment methods are accepted for 1.5SMC51A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51A-M3/57T?
1.5SMC51A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51A-M3/57T 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 1.5SMC51A-M3/57T?
For technical support, including 1.5SMC51A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51A-M3/57T requirements.
6.How does Aetrix verify that 1.5SMC51A-M3/57T is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51A-M3/57T 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 1.5SMC51A-M3/57T meets industry standards.
7.What is the process for return or replacement of 1.5SMC51A-M3/57T?
All 1.5SMC51A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51A-M3/57T, 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 1.5SMC51A-M3/57T part is unused and in its original packaging.
Return procedure for 1.5SMC51A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51A-M3/57T Tags
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