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Vishay General Semiconductor - Diodes Division SMC3K51CAHM3/9A
- Part No.:
- SMC3K51CAHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K51CAHM3/9A.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,360
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Product details
Overview
SMC3K51CAHM3/9A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, featuring 51 V stand-off voltage (VWM), 56.7–62.7 V breakdown voltage (VBR), 3000 W peak pulse power (10/1000 μs), and 36.4 A peak pulse current (IPPM). It is AEC-Q101 qualified and used to protect automotive sensor signal lines and MOSFET gates against inductive switching transients.
For engineers reviewing the SMC3K51CAHM3/9A datasheet, SMC3K51CAHM3/9A pinout, SMC3K51CAHM3/9A application, or SMC3K51CAHM3/9A equivalent, key selection criteria include clamping voltage (82.4 V at IPPM), bidirectional polarity, MSL Level 1 moisture sensitivity, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This TVS diode operates as a voltage-clamping protection device with fast response time and low incremental surge resistance, enabling effective suppression of transient overvoltages induced by inductive load switching or ESD events. Its bidirectional architecture allows symmetrical clamping on both polarities without external polarity management.
The device is rated for junction temperatures from –55 °C to +150 °C and features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification per JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 56.7 V / 62.7 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold under surge conditions. |
| VC @ IPPM | 82.4 V - Clamping voltage measured at 36.4 A peak pulse current; determines maximum voltage seen by downstream ICs during transient. |
| PPPM | 3000 W - Peak pulse power handling capability with 10/1000 μs waveform; supports high-energy transient suppression in automotive and industrial systems. |
| Polarity | Bidirectional - Provides symmetrical overvoltage protection on AC or floating signal lines without polarity constraints. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad area recommendation for thermal performance. |
| TJ max | +150 °C - Maximum junction temperature rating enables operation in under-hood automotive environments and high-power industrial enclosures. |
Pinout & Package
SMC (DO-214AB) package: molded plastic case with two coplanar terminals; no polarity marking on bidirectional variants; matte tin-plated leads; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Transient conduction path (bidirectional) | Both terminals function identically; no designated anode/cathode - enables placement flexibility on PCB without orientation check. |
| Anode (Cathode) | Transient conduction path (bidirectional) | Identical electrical role to opposite terminal; symmetric I-V curve ensures equal clamping in either direction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces requiring long-term reliability under thermal cycling and vibration. |
| 3000 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges without derating in standard layouts. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage stress on protected devices - critical for safeguarding 5 V or 3.3 V logic-level interfaces behind series impedance. |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and reflow compatibility with standard lead-free profiles up to 260 °C peak, eliminating bake requirements pre-assembly. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental compliance mandates for automotive OEMs and industrial equipment manufacturers without compromising surge performance. |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive kickback in vehicle ECUs. IC Role / Device Role / Timing Role: Voltage-clamping transient suppressor placed directly at connector or IC input pins. Use Value: Limits transient voltage to ≤82.4 V, preventing latch-up or gate oxide damage in 5 V tolerant transceivers and ADC front-ends. |
Use Scenario: Safeguarding microcontroller GPIOs and optocoupler inputs connected to relay coils or solenoid drivers in PLC I/O modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on digital control lines subject to repetitive inductive switching noise. Use Value: Withstands ≥36.4 A surge current per event and maintains stable clamping across –55 °C to +150 °C ambient range. |
| Telecom Line Interface | Consumer Power Adapter Feedback Loop |
Use Scenario: Shielding Ethernet PHY magnetics bias windings and PoE detection circuitry from lightning-induced surges on outdoor telecom links. IC Role / Device Role / Timing Role: Secondary-level TVS placed after primary gas discharge tube (GDT) to refine clamping and limit let-through energy. Use Value: Bidirectional symmetry eliminates need for polarity-aware layout; 82.4 V VC aligns with 100BASE-TX common-mode tolerance limits. |
Use Scenario: Protecting optocoupler feedback pins in isolated AC/DC adapters against transformer leakage spikes and output capacitor discharge transients. IC Role / Device Role / Timing Role: Fast-response shunt element across secondary-side error amplifier inputs. Use Value: Sub-nanosecond response time prevents propagation of >51 V transients into TL431 or similar reference ICs, preserving regulation stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K51CAHM3/57 | Same electrical specs and AEC-Q101 qualification; differs only in packaging - 7″ tape reel (850 pcs) vs. 13″ reel (3500 pcs). | Preferred for low-volume prototyping or small-batch production where reel changeover frequency must be minimized. | Select SMC3K51CAHM3/57 when matching existing SMT line setup using 7″ reels or when avoiding large inventory commitments. |
| SMC3K51CA-M3/9A | Identical VWM, VBR, VC, and PPPM; differs in qualification - commercial grade (M3) vs. AEC-Q101 (HM3); no whisker test certification. | Suitable for non-automotive industrial or consumer applications where automotive reliability validation is not required. | Choose SMC3K51CA-M3/9A for cost-sensitive designs outside automotive scope, provided MSL Level 1 and RoHS compliance remain sufficient. |
Compared with SMC3K51CAHM3/9A, the /57 variant offers identical performance in smaller reels for flexibility, while the M3/9A version trades AEC-Q101 validation for lower cost in non-automotive use cases - both retain full pin-to-package compatibility and surge ratings.
Availability
SMC3K51CAHM3/9A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial motor drive inputs, telecom line protection, and consumer power adapter feedback loops requiring stable component supply and AEC-Q101 assurance.
Supply support for SMC3K51CAHM3/9A 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 high-reliability and automotive-grade solutions.
The SMC3KxxCAHM3 series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh environments including automotive powertrain and chassis systems.
FAQ
What does the "HM3" suffix mean in SMC3K51CAHM3/9A?
The HM3 suffix in SMC3K51CAHM3/9A indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD201 Class 2 whisker resistance. It distinguishes this automotive-grade variant from commercial M3 versions and confirms compliance with automotive reliability standards including thermal cycling and mechanical shock testing.
Is SMC3K51CAHM3/9A suitable for new automotive designs?
No - Vishay explicitly marks the SMC3K22CA through SMC3K78CA family as "Not for New Designs", recommending migration to the newer SMC3K10CAHM3_A through SMC3K120CAHM3_A series. SMC3K51CAHM3/9A remains available for legacy support and existing production but is not approved for newly initiated automotive programs.
What is the clamping voltage of SMC3K51CAHM3/9A at its rated peak pulse current?
The clamping voltage (VC) of SMC3K51CAHM3/9A is 82.4 V when subjected to its maximum rated peak pulse current (IPPM) of 36.4 A under the standard 10/1000 μs waveform. This value is measured at TJ = 25 °C and defines the upper voltage limit imposed on protected circuitry during surge events.
Does SMC3K51CAHM3/9A have polarity markings on the package?
No, SMC3K51CAHM3/9A has no polarity markings because it is a bidirectional TVS diode. Both terminals are functionally identical, allowing unrestricted orientation during placement on PCBs - a key advantage for automated assembly and space-constrained layouts where polarity verification would add complexity.
What is the moisture sensitivity level (MSL) rating for SMC3K51CAHM3/9A?
SMC3K51CAHM3/9A is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can withstand standard lead-free reflow profiles with peak temperatures up to 260 °C without baking. This simplifies manufacturing flow and eliminates moisture-related defects such as popcorning during assembly.
SMC3K51CAHM3/9A 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 36.4A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMC3K51CAHM3/9A FAQ
1.How can I place an order for SMC3K51CAHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K51CAHM3/9A 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 SMC3K51CAHM3/9A reliable?
The price and inventory of SMC3K51CAHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K51CAHM3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K51CAHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K51CAHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K51CAHM3/9A?
SMC3K51CAHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K51CAHM3/9A 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 SMC3K51CAHM3/9A?
For technical support, including SMC3K51CAHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K51CAHM3/9A requirements.
6.How does Aetrix verify that SMC3K51CAHM3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K51CAHM3/9A 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 SMC3K51CAHM3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K51CAHM3/9A?
All SMC3K51CAHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K51CAHM3/9A, 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 SMC3K51CAHM3/9A part is unused and in its original packaging.
Return procedure for SMC3K51CAHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K51CAHM3/9A Tags
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