My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMC5K51A-M3/I
- Part No.:
- SMC5K51A-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K51A-M3/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:803
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMC5K51A-M3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features a 51 V stand-off voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 82.4 V maximum clamping voltage at 60.7 A (10/1000 μs), 5000 W peak pulse power, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMC5K51A-M3/I datasheet, SMC5K51A-M3/I pinout, SMC5K51A-M3/I application, or SMC5K51A-M3/I equivalent, this device is selected for robust overvoltage protection in DC power rails, automotive ECUs, industrial sensor interfaces, and telecom line cards where fast response (<1 ns), low clamping ratio, and stable thermal performance up to 150 °C are critical.
Technical Context
This TVS operates as a unidirectional avalanche diode with sharp reverse-breakdown characteristics, triggered when transient voltage exceeds VBR. Its low incremental surge resistance ensures minimal voltage overshoot during high-current transients like ISO 7637-2 pulses or IEC 61000-4-5 surges.
Thermal design relies on RthJM = 4.0 °C/W (junction-to-mount) and RthJA = 90 °C/W (junction-to-ambient), enabling reliable operation under repetitive surge conditions when mounted on standard FR4 PCBs with recommended pad layout. ESD immunity meets IEC 61000-4-2 at ±30 kV (contact/air).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - Tight breakdown tolerance ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 82.4 V at 60.7 A (10/1000 μs) - Clamping voltage limits downstream IC stress during 5000 W surge events. |
| PPPM | 5000 W - Peak pulse power rating for 10/1000 μs waveform; supports high-energy automotive load-dump suppression. |
| TJ max | +150 °C - Maximum junction temperature enables use in under-hood automotive environments and industrial enclosures. |
| ESD Rating | ±30 kV HBM (IEC 61000-4-2) - Protects sensitive inputs against electrostatic discharge without external circuitry. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, halogen-free and RoHS-compliant (M3 suffix). Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; completes clamping current loop during transient events. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 48 V supply rail); absorbs positive-going transients via avalanche conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Protects only against positive transients on DC lines-ideal for single-polarity power rails without reverse-voltage risk. |
| 5000 W peak pulse power (10/1000 μs) | Handles severe load-dump surges per ISO 7637-2 Class V without degradation or failure. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS sensors. |
| MSL Level 1 (260 °C reflow) | Compatible with standard lead-free SMT assembly processes without moisture sensitivity concerns. |
| UL 497B recognized (E136766) | Meets safety standards for telecom and industrial equipment requiring certified surge protection components. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (up to 120 V, 400 ms) on 12 V/48 V vehicle battery lines feeding ECUs and lighting modules. IC Role / Device Role / Timing Role: Primary clamping element placed between battery input and DC-DC converter input stage. Use Value: Limits voltage seen by downstream regulators to ≤82.4 V, preventing latch-up or permanent damage during ISO 7637-2 Pulse 5a events. |
Use Scenario: Guarding analog outputs of pressure/temperature sensors in factory automation PLCs exposed to motor switching noise. IC Role / Device Role / Timing Role: Shunt protector on 0–10 V or 4–20 mA output lines, placed adjacent to connector interface. Use Value: Responds in <1 ns to 1 kV/μs transients, clamping induced spikes before they corrupt ADC readings or damage op-amps. |
| Telecom Line Card Surge Suppression | Consumer Power Adapter Input Protection |
Use Scenario: Protecting primary-side MOSFETs and controllers in PoE-powered network switches against lightning-induced surges on Ethernet ports. IC Role / Device Role / Timing Role: Front-end TVS on DC input derived from midspan PSE, upstream of fuse and filter. Use Value: Withstands 8/20 μs surges up to 374 A while maintaining clamping voltage ≤107 V-preserving isolation barrier integrity. |
Use Scenario: Safeguarding AC-DC adapter primary rectifier and controller ICs against mains-borne surges (IEC 61000-4-5 Level 3). IC Role / Device Role / Timing Role: Across-line protector between bridge rectifier output and bulk capacitor. Use Value: Delivers 5000 W surge handling without derating at +85 °C ambient, ensuring compliance in compact, thermally constrained adapters. |
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-M3/52 | Lower PPPM (600 W), SMB package (smaller footprint, higher RthJA = 110 °C/W), same VWM/VBR range. | Suitable for space-constrained consumer electronics with lower surge exposure (e.g., USB-C PD adapters). | Select when board area is limited and surge energy does not exceed 600 W; avoid for automotive load-dump duty. |
| SMC5K51AHM3_A/I | Identical electrical specs; HM3 suffix denotes AEC-Q101 qualification and automotive traceability (base P/NHM3). | Required for OEM automotive designs needing full PPAP documentation and lot-level traceability. | Choose SMC5K51A-M3/I for industrial/commercial use; upgrade to SMC5K51AHM3_A/I only when automotive qualification is mandated. |
Compared with SMBJ51A-M3/52, the SMC5K51A-M3/I delivers 8.3× higher surge power handling and superior thermal dissipation, making it suitable for harsh environments; versus SMC5K51AHM3_A/I, it shares identical protection performance but omits automotive-specific documentation and traceability-reducing cost for non-automotive programs.
Availability
SMC5K51A-M3/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom line card production requiring stable component supply and long-term lifecycle support.
Supply support for SMC5K51A-M3/I 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 power MOSFETs with emphasis on reliability and ruggedness.
The SMC5KxxA series was developed specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure-balancing clamping performance, thermal robustness, and AEC-Q101 compliance.
FAQ
What is the clamping voltage of SMC5K51A-M3/I at its rated peak pulse current?
The SMC5K51A-M3/I has a maximum clamping voltage (VC) of 82.4 V at 60.7 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuits during surge events. The clamping voltage remains stable across temperature and unit-to-unit variation due to tight VBR tolerance (56.7–62.7 V).
Is SMC5K51A-M3/I suitable for automotive applications?
Yes, the SMC5K51A-M3/I is qualified to AEC-Q101 for stress testing and reliability, and is rated for operation from –55 °C to +150 °C junction temperature-making it appropriate for under-hood and chassis-mounted automotive systems. While the base M3 suffix indicates industrial-grade qualification, its electrical and thermal specs fully meet automotive surge requirements such as ISO 7637-2 Pulse 5a.
How does the SMC5K51A-M3/I differ from SMC5K51AHM3_A/I?
The SMC5K51A-M3/I and SMC5K51AHM3_A/I share identical electrical specifications, package, and surge performance. The key distinction lies in qualification: HM3 denotes AEC-Q101 compliance with full automotive traceability (lot-level documentation, PPAP support), whereas M3 is industrial-grade. Both use the same SMC (DO-214AB) package and halogen-free RoHS construction.
What is the thermal resistance of SMC5K51A-M3/I, and how does it affect PCB layout?
The SMC5K51A-M3/I has RthJM = 4.0 °C/W (junction-to-mount) and RthJA = 90 °C/W (junction-to-ambient) when mounted on a standard FR4 PCB. To maintain safe junction temperatures during repeated surges, designers must follow Vishay's recommended mounting pad layout-especially copper area under the cathode/anode terminals-to ensure effective heat transfer to the PCB plane.
Does SMC5K51A-M3/I meet UL safety certification?
Yes, the SMC5K51A-M3/I is UL recognized under file E136766 to UL 497B for use in telecommunications and industrial equipment. This certification confirms its suitability for primary-side surge protection in safety-critical applications where regulatory compliance is mandatory, including end-equipment listings for North American markets.
SMC5K51A-M3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 60.7A
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC5K51A-M3/I FAQ
1.How can I place an order for SMC5K51A-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K51A-M3/I 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 SMC5K51A-M3/I reliable?
The price and inventory of SMC5K51A-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC5K51A-M3/I is usually 5 days.
3.What payment methods are accepted for SMC5K51A-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K51A-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K51A-M3/I?
SMC5K51A-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K51A-M3/I 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 SMC5K51A-M3/I?
For technical support, including SMC5K51A-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K51A-M3/I requirements.
6.How does Aetrix verify that SMC5K51A-M3/I is sourced from the original manufacturer or authorized distributors?
All SMC5K51A-M3/I 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 SMC5K51A-M3/I meets industry standards.
7.What is the process for return or replacement of SMC5K51A-M3/I?
All SMC5K51A-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K51A-M3/I, 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 SMC5K51A-M3/I part is unused and in its original packaging.
Return procedure for SMC5K51A-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC5K51A-M3/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
