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Vishay General Semiconductor - Diodes Division SMC3K51CAHM3_A/H
- Part No.:
- SMC3K51CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K51CAHM3_A/H.pdf
- Description:
- 3KW, 51V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,644
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Product details
Overview
SMC3K51CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, designed for automotive and industrial electronics protection. It features 51 V standoff voltage (VWM), 56.7–62.7 V breakdown voltage (VBR), 82.4 V clamping voltage at 36.4 A (10/1000 μs), 3000 W peak pulse power, and AEC-Q101 qualification - deployed to safeguard MOSFETs and sensor signal lines against ISO 7637-2 Pulse 1/2a/3a/3b transients.
For engineers reviewing the SMC3K51CAHM3_A datasheet, SMC3K51CAHM3_A pinout, SMC3K51CAHM3_A application, or SMC3K51CAHM3_A equivalent, key selection criteria include clamping performance under 10/1000 μs and 8/20 μs waveforms, bidirectional surge handling up to 280 A (8/20 μs), junction temperature range (−55 °C to +175 °C), and compliance with IEC 61000-4-2 ESD (30 kV contact/air).
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transient overvoltages induced by inductive switching or load dump events. Its bidirectional architecture enables symmetric clamping on both polarities without polarity marking, supporting robust protection of differential or AC-coupled signal paths.
It meets ISO 7637-2 (Pulse 1, 2a, 3a, 3b) and ISO 16750-2 (Pulse b) automotive surge immunity requirements, with verified clamping behavior at 12 V battery system levels. Thermal design is enabled by RthJA = 90 °C/W and RthJM = 4.0 °C/W, supporting high-reliability mounting on FR4 PCBs per JEDEC 51-2A/51-14.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working margin for 48 V nominal systems. |
| VBR (min/max) | 56.7 V / 62.7 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on across temperature and process variation. |
| VC @ IPPM (10/1000 μs) | 82.4 V at 36.4 A - Clamping voltage during standard 10/1000 μs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 3000 W - Peak pulse power handling capability under 10/1000 μs waveform; supports high-energy transients common in automotive load dump. |
| IPPM (8/20 μs) | 280 A - Peak surge current tolerance under fast 8/20 μs lightning-like waveform; critical for telecom and industrial surge immunity. |
| TJ max. | +175 °C - Maximum junction temperature rating; enables operation in under-hood automotive environments and high-power industrial enclosures. |
| ESD Rating | ±30 kV (IEC 61000-4-2, contact/air) - Robust electrostatic discharge immunity for assembly-line and field-replaceable interfaces. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Matte tin-plated leads, MSL Level 1 (260 °C reflow peak), UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | Reference terminal for unidirectional interpretation | Bidirectional device - no functional polarity; cathode marking is for mechanical orientation only, not electrical directionality. |
| Anode | Complementary terminal | Together with cathode, forms symmetrical clamping path; both terminals behave identically under positive or negative transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or polarity-agnostic inputs without external diode pairing. |
| 3000 W peak pulse power (10/1000 μs) | Supports sustained energy absorption in automotive load-dump scenarios where pulse duration exceeds 100 ms. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias HAST, and mechanical shock - suitable for engine control, ADAS, and body electronics. |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes overvoltage overshoot during transient events, reducing risk of gate oxide damage in protected MOSFETs and logic ICs. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, simplifying SMT manufacturing for high-volume automotive Tier-1 suppliers. |
Applications
| Automotive Sensor Signal Protection | Industrial Motor Drive Gate Protection |
|---|---|
|
Use Scenario: Protecting analog outputs of pressure, temperature, and position sensors in engine control units exposed to ISO 7637-2 Pulse 3b (150 ns, 150 V) transients. IC Role / Device Role / Timing Role: Shunt clamping element placed directly at sensor connector interface to limit voltage excursion before reaching downstream ADC or op-amp input. Use Value: Maintains signal integrity by clamping to ≤82.4 V during 36.4 A surges, preventing latch-up or parametric drift in precision analog front-ends. |
Use Scenario: Safeguarding high-side and low-side MOSFET gate drivers in 48 V industrial motor inverters subjected to inductive kickback from 100 A+ loads. IC Role / Device Role / Timing Role: Bidirectional TVS mounted across driver output pins to clamp both positive and negative voltage spikes generated during PWM switching transitions. Use Value: Limits gate-source voltage to <±82.4 V, avoiding gate oxide rupture while enabling compact layout without discrete Zener + resistor networks. |
| Telecom Power Line Surge Suppression | Automotive Infotainment USB Interface Protection |
|
Use Scenario: Front-end protection of 48 V PoE-powered base station equipment complying with IEC 61000-4-5 (8/20 μs, 280 A) surge requirements. IC Role / Device Role / Timing Role: Primary shunt suppressor on DC input rail upstream of DC/DC converter, absorbing multi-kW surge energy before downstream regulation stages. Use Value: Withstands 280 A peak current at 107 V clamping level, reducing required bulk capacitance and eliminating need for series impedance matching. |
Use Scenario: ESD and transient protection for USB 2.0 data lines (D+/D−) and VBUS in automotive head units exposed to IEC 61000-4-2 ±30 kV discharges. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed inline with each signal line to divert ESD current away from USB PHY transceivers. Use Value: Junction capacitance <50 pF (typ.) at 0 V bias preserves signal integrity up to 480 Mbps, while 30 kV ESD rating exceeds USB-IF compliance thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51CA | Same VWM (51 V), lower PPPM (400 W), SMA package (smaller thermal mass, higher RthJA = 150 °C/W) | Limited to low-energy consumer electronics; insufficient for ISO 7637-2 Pulse 1 or automotive load dump. | Select only for space-constrained non-automotive designs where surge energy is <50 mJ. |
| SMCJ51CA | Same VWM (51 V), identical SMC package, but rated for 1500 W PPPM (half the 3000 W of SMC3K51CAHM3_A) | Meets basic IEC 61000-4-5 Level 3 but not full ISO 7637-2 Pulse 1 (−150 V, 2 ms) or Pulse b load dump profiles. | Choose when cost sensitivity outweighs requirement for full AEC-Q101 automotive surge margin. |
Compared with SMAJ51CA and SMCJ51CA, SMC3K51CAHM3_A delivers double the peak pulse power and full AEC-Q101 qualification - making it the only option among the three validated for under-hood automotive deployment and high-energy industrial transients.
Availability
SMC3K51CAHM3_A is available at Aetrix Electronics and suitable for automotive ECUs, industrial motor drives, telecom power supplies, and infotainment systems requiring stable component supply with long-term lifecycle support and AEC-Q101 traceability.
Supply support for SMC3K51CAHM3_A 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, power efficiency, and automotive qualification.
The SMC3KxxCAHM3_A series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh automotive and industrial environments where AEC-Q101 compliance and ISO 7637/16750 immunity are mandatory.
FAQ
What is the clamping voltage of SMC3K51CAHM3_A under a 10/1000 μs surge?
The SMC3K51CAHM3_A clamps to 82.4 V at its rated peak pulse current of 36.4 A under the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 standards and reflects worst-case voltage seen by protected circuitry during standardized surge testing - critical for verifying margin against MOSFET VDS(max) or IC absolute maximum ratings.
Is SMC3K51CAHM3_A suitable for automotive under-hood applications?
Yes, SMC3K51CAHM3_A is AEC-Q101 qualified and rated for −55 °C to +175 °C junction temperature operation. Its SMC (DO-214AB) package, MSL Level 1 rating, and validation against ISO 7637-2 Pulse 1/2a/3a/3b and ISO 16750-2 Pulse b make it appropriate for engine control modules, transmission controllers, and other under-hood systems where thermal and surge stress are extreme.
Does SMC3K51CAHM3_A have polarity markings, and how does that affect circuit layout?
SMC3K51CAHM3_A is bidirectional and carries no functional polarity - the cathode marking on the case is for mechanical orientation only. Layout requires no directional placement; either terminal may connect to line or ground. This simplifies PCB routing for differential or AC-coupled protection schemes and eliminates risk of reverse installation error.
What is the ESD withstand capability of SMC3K51CAHM3_A?
SMC3K51CAHM3_A meets IEC 61000-4-2 with ±30 kV contact discharge and ±30 kV air discharge ratings. This exceeds standard USB, CAN, and sensor interface ESD requirements and ensures robustness during automated assembly, field servicing, and end-user handling - confirmed via factory qualification testing per AEC-Q101.
How does the thermal resistance of SMC3K51CAHM3_A impact PCB layout?
With RthJA = 90 °C/W and RthJM = 4.0 °C/W, SMC3K51CAHM3_A demands adequate copper pour on the anode/cathode pads per JEDEC 51-2A footprint guidelines. Insufficient thermal land area increases junction temperature during repeated surges, accelerating degradation - verified layout data is provided in Vishay document 98241, page 6.
SMC3K51CAHM3_A/H 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC3K51CAHM3_A/H FAQ
1.How can I place an order for SMC3K51CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K51CAHM3_A/H 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_A/H reliable?
The price and inventory of SMC3K51CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K51CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMC3K51CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K51CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K51CAHM3_A/H?
SMC3K51CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K51CAHM3_A/H 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_A/H?
For technical support, including SMC3K51CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K51CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K51CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K51CAHM3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of SMC3K51CAHM3_A/H?
All SMC3K51CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K51CAHM3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for SMC3K51CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K51CAHM3_A/H Tags
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