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Vishay General Semiconductor - Diodes Division 1.5SMC51A-M3/9AT
- Part No.:
- 1.5SMC51A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51A-M3/9AT.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,719
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Product details
Overview
1.5SMC51A-M3/9AT 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 to ≤70.1 V at 21.4 A peak pulse current (10/1000 µs), and delivers 1500 W peak pulse power in an SMC (DO-214AB) package - deployed in automotive sensor interfaces, industrial I/O protection, and DC power rail surge suppression.
For engineers reviewing the 1.5SMC51A-M3/9AT datasheet, 1.5SMC51A-M3/9AT pinout, 1.5SMC51A-M3/9AT application, or 1.5SMC51A-M3/9AT equivalent, this part serves as a halogen-free, RoHS-compliant, commercial-grade TVS with AEC-Q101 qualification available in M3 suffix variants - critical for ESD, lightning, and inductive-switching transient immunity in high-reliability embedded systems.
Technical Context
The 1.5SMC51A-M3/9AT operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable reverse-breakdown behavior and fast response (<1 ns). Its clamping action begins at VWM = 43.6 V and limits transient energy via low incremental surge resistance and excellent thermal dissipation (RθJA = 75 °C/W).
Rated for -65 °C to +150 °C junction temperature, it supports repetitive 10/1000 µs transients at 0.01% duty cycle and withstands 200 A non-repetitive forward surge (8.3 ms half-sine), making it suitable for both primary and secondary protection stages in 24 V and 48 V industrial and automotive subsystems.
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 triggering |
| VWM | 43.6 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | ≤70.1 V at 21.4 A - clamping voltage under 1500 W 10/1000 µs surge, limiting downstream stress |
| PPPM | 1500 W - peak pulse power handling capacity per standard waveform, enabling high-energy transient absorption |
| IFSM | 200 A - single half-sine surge rating (8.3 ms), supporting inrush and fault-current resilience |
| TJ max | +150 °C - maximum junction temperature, allowing operation in under-hood or enclosed industrial environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal relief |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C reflow peak), polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during forward surge events |
| Cathode | Avalanche breakdown terminal | Connected to higher-potential side; initiates clamping when reverse voltage exceeds VWM |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables protection against severe lightning-induced surges and inductive kickback in 24–48 V systems |
| Low incremental surge resistance | Minimizes clamping voltage overshoot and improves energy-handling consistency across pulses |
| Glass-passivated chip junction | Ensures long-term stability of VBR and leakage performance under thermal cycling and humidity stress |
| Halogen-free & RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and automotive supply chains without compromising reliability |
| Fast response time (<1 ns) | Engages before sensitive ICs or MOSFETs experience damaging overvoltage, preserving system integrity |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground, clamping transients before they reach the transceiver's input stage. Use Value: Maintains VWM = 43.6 V margin below typical 48 V battery rail while clamping to ≤70.1 V - within absolute maximum ratings of most automotive interface ICs. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and field-wiring ESD. IC Role / Device Role / Timing Role: Primary-level TVS on 24 V DC input channels, absorbing >1 kV/100 Ω ring-wave transients per IEC 61000-4-5. Use Value: 1500 W capability and 21.4 A IPPM ensure survival of repeated 200–500 A surge events common in factory-floor environments. |
| DC Power Rail Surge Suppression | Telecom Line Interface Protection |
Use Scenario: Secondary protection on 48 V telecom power supplies and PoE injectors subjected to AC-line coupled surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across output rails, activated after upstream MOV/GDT stages to limit residual clamping voltage. Use Value: Tight VBR tolerance (±5.2%) and low VC/VBR ratio (1.31×) minimize let-through energy to downstream DC-DC converters. |
Use Scenario: Protecting Ethernet PHY front-ends and DSL line drivers from induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Unidirectional TVS on each differential pair (e.g., TX+/TX−), referenced to local ground with minimal parasitic capacitance. Use Value: Junction capacitance <100 pF (typ.) at zero bias ensures signal integrity up to 100 Mbps without distortion or jitter degradation. |
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 | Lower peak power (600 W), same VBR range, SMB package (smaller footprint, higher RθJA) | Limited to lower-energy transients; unsuitable for 1500 W IEC 61000-4-5 Level 4 testing | Select when board space is constrained and surge threat level is Class 2 or lower. |
| 1.5KE51A | Through-hole TO-204AA (DO-41) package, identical electrical specs but no halogen-free/M3 option | Requires wave soldering or manual assembly; incompatible with fully SMT production flows | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SMBJ51A and 1.5KE51A, the 1.5SMC51A-M3/9AT uniquely combines 1500 W surge capacity, SMC surface-mount compatibility, halogen-free compliance, and AEC-Q101 qualification readiness - making it the optimal choice for high-volume, high-reliability SMT deployments in automotive and industrial control.
Availability
1.5SMC51A-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and 48 V DC power rail surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1.5SMC51A-M3/9AT 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The 1.5SMC Series was engineered for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where compact size, repeatable clamping, and AEC-Q101 readiness are mandatory.
FAQ
What is the breakdown voltage tolerance of the 1.5SMC51A-M3/9AT?
The 1.5SMC51A-M3/9AT has a specified breakdown voltage range of 48.5 V to 53.6 V at 1 mA test current, representing a ±5.2% tolerance about the nominal 51 V rating. This tight VBR distribution ensures consistent clamping behavior across production lots and supports precise overvoltage margining in safety-critical circuits.
Is the 1.5SMC51A-M3/9AT suitable for automotive applications?
Yes - the 1.5SMC51A-M3/9AT is halogen-free and RoHS-compliant (M3 suffix), and its base family is AEC-Q101 qualified (with HE3/HM3 suffixes). While the M3/9AT variant itself is commercial-grade, its construction, thermal rating (TJ max = +150 °C), and robust surge performance make it widely deployed in non-safety-critical automotive subsystems such as body control modules and sensor interfaces.
What does the "/9AT" suffix indicate in 1.5SMC51A-M3/9AT?
The "/9AT" suffix denotes packaging: 13-inch diameter plastic tape and reel, with 3500 units per reel. This format is optimized for high-speed SMT placement equipment and supports automated manufacturing workflows - distinct from the "/57T" (7-inch reel, 850 units) option used for lower-volume or prototype builds.
How does the 1.5SMC51A-M3/9AT compare to bidirectional TVS diodes like 1.5SMC51CA?
The 1.5SMC51A-M3/9AT is unidirectional and intended for DC-biased lines where polarity is fixed (e.g., +48 V rails); it offers lower leakage and tighter VBR control. In contrast, 1.5SMC51CA is bidirectional and suited for AC or floating signals (e.g., data lines), but exhibits higher leakage and wider VBR spread. Selection depends strictly on circuit topology and bias configuration - they are not interchangeable without schematic review.
What is the maximum allowable PCB pad size for thermal performance of the 1.5SMC51A-M3/9AT?
Per Vishay specification, optimal thermal performance for the 1.5SMC51A-M3/9AT requires mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Reducing pad area increases RθJA and risks exceeding TJ max under repetitive surge conditions; increasing pad size beyond this yields diminishing returns due to package-limited conduction paths.
1.5SMC51A-M3/9AT 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-M3/9AT FAQ
1.How can I place an order for 1.5SMC51A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51A-M3/9AT 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-M3/9AT reliable?
The price and inventory of 1.5SMC51A-M3/9AT 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-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC51A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51A-M3/9AT?
1.5SMC51A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51A-M3/9AT 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-M3/9AT?
For technical support, including 1.5SMC51A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51A-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC51A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51A-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC51A-M3/9AT?
All 1.5SMC51A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51A-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC51A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51A-M3/9AT Tags
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