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Vishay General Semiconductor - Diodes Division SMCJ51AHM3/H
- Part No.:
- SMCJ51AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51AHM3/H.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,902
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Product details
Overview
SMCJ51AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 51 V standoff voltage, 82.4 V clamping voltage at 18.2 A peak pulse current, and 1500 W peak pulse power rating under 10/1000 µs waveform. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ51AHM3/H datasheet, SMCJ51AHM3/H pinout, SMCJ51AHM3/H application, or SMCJ51AHM3/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and junction temperature range (–55 to +150 °C).
Technical Context
This TVS diode operates as a clamping device that transitions from high-impedance standby to low-impedance conduction when reverse voltage exceeds its breakdown threshold (56.7–62.7 V at 1 mA). Its glass-passivated junction ensures stable leakage (<1 µA at 51 V) and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced transients, and inductive switching spikes.
The SMCJ51AHM3/H uses a single P-N junction structure with cathode-band marking, optimized for automated placement on PCBs with 8.0 mm × 8.0 mm copper pads per terminal. Its MSL Level 1 rating (peak reflow ≤260 °C) and JESD201 Class 2 whisker resistance support robust manufacturing reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 51 V - Maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 56.7–62.7 V at 1 mA - Confirmed voltage range where device enters avalanche conduction |
| Clamping Voltage (VC) | 82.4 V at 18.2 A - Peak voltage seen by protected circuit during 10/1000 µs surge |
| Peak Pulse Power (PPPM) | 1500 W - Surge energy handling capacity under standardized transient waveform |
| Junction Temperature Range | –55 to +150 °C - Full operational range compatible with under-hood automotive environments |
| Thermal Resistance (RθJA) | 75 °C/W - Predictable junction-to-ambient temperature rise under 6.5 W steady-state dissipation |
| Leakage Current (ID) | <1 µA at 51 V - Minimal standby power loss and signal integrity impact in high-impedance circuits |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Cathode identified by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or common return path; defines forward conduction direction |
| Cathode | Protected line input | Connected to signal/power line requiring transient suppression; band-marked end |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| 1500 W peak pulse power | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without derating in standard layouts |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving margin for 3.3 V/5 V logic interfaces |
| MSL Level 1 moisture sensitivity | Allows direct placement into reflow ovens without dry-packaging or baking preconditioning |
| Glass passivated junction | Ensures long-term stability of VBR and leakage performance across lifetime and temperature extremes |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump transients up to 35 V and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground, clamping surges before they reach downstream regulators and microcontrollers. Use Value: Maintains system uptime by preventing latch-up or permanent damage to 5 V/3.3 V logic during cold-crank and alternator load dump events. | Use Scenario: Shielding analog outputs of pressure/temperature sensors in PLC I/O modules from field-wiring induced transients. IC Role / Device Role / Timing Role: Standoff-mode protector on 4–20 mA current loop or 0–10 V output lines, absorbing coupling noise from adjacent motor drives. Use Value: Preserves measurement accuracy by limiting voltage excursions to <83 V, well below ADC input damage thresholds. |
| DC-DC Converter Input Stage | Motor Drive Gate Driver Protection |
Use Scenario: Safeguarding buck converter inputs in solar charge controllers exposed to lightning-induced surges on PV string wiring. IC Role / Device Role / Timing Role: Primary overvoltage clamp ahead of input filter capacitors and controller ICs, rated for repeated 1500 W pulses. Use Value: Extends service life by eliminating capacitor dielectric stress and MOSFET gate oxide failure caused by repetitive 100 V+ spikes. | Use Scenario: Protecting high-side and low-side gate drivers in BLDC inverters from Miller-induced shoot-through due to dV/dt coupling. IC Role / Device Role / Timing Role: Localized clamping at driver output pins to suppress ringing and voltage overshoot during fast switching transitions. Use Value: Reduces false triggering and improves PWM fidelity by holding gate-source voltage within ±20 V safe operating area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51AHE3/A | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Not suitable for >500 W surge environments; limited to consumer-grade board-level protection | Select when space-constrained layout prohibits SMC and surge energy remains below 400 W. |
| SMCJ51A-M3/57T | Same electrical specs and SMC package, but commercial-grade (non-AEC-Q101) and non-halogen-free | Lacks automotive qualification; acceptable for industrial/commercial use where AEC-Q101 not mandated | Choose for cost-sensitive non-automotive designs requiring identical clamping behavior and layout compatibility. |
Compared with SMAJ51AHE3/A and SMCJ51A-M3/57T, the SMCJ51AHM3/H delivers automotive-grade reliability with halogen-free compliance and full 1500 W surge capability-making it the only option qualified for under-hood deployment while maintaining pin-compatible SMC footprint.
Availability
SMCJ51AHM3/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, DC-DC converter input staging, and motor drive gate driver safeguarding requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SMCJ51AHM3/H 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 optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series was developed for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of the SMCJ51AHM3/H under maximum rated surge current?
The SMCJ51AHM3/H has a maximum clamping voltage (VC) of 82.4 V at 18.2 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured and guaranteed per Vishay's datasheet revision 09-Jan-2024 (Document Number: 88394), ensuring predictable overvoltage limiting for downstream components in the SMCJ51AHM3/H protection circuit.
Is the SMCJ51AHM3/H qualified for automotive applications?
Yes, the SMCJ51AHM3/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the SMCJ5.0A–SMCJ188CA datasheet. This qualification covers stress tests including temperature cycling, high-temperature operating life, and mechanical shock-making the SMCJ51AHM3/H suitable for under-hood and chassis-mounted automotive electronics.
What does the "HM3" suffix indicate in SMCJ51AHM3/H?
The "HM3" suffix in SMCJ51AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information, HM3 devices meet JESD201 Class 2 whisker resistance and UL 94 V-0 flammability standards-distinguishing them from commercial-grade M3 or HE3 variants and confirming suitability for regulated automotive and green-industrial designs.
How does the SMCJ51AHM3/H differ from the bidirectional SMCJ51CA variant?
The SMCJ51AHM3/H is unidirectional with cathode-band marking and conducts only in reverse breakdown, whereas SMCJ51CA is bidirectional and symmetrical-clamping in both polarities. The SMCJ51AHM3/H offers lower leakage and is used where polarity is known (e.g., DC power rails); SMCJ51CA suits AC-coupled or floating signal lines where voltage reversal occurs.
What PCB pad layout is recommended for optimal thermal performance of the SMCJ51AHM3/H?
Vishay specifies a minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad per terminal for the SMCJ51AHM3/H to achieve rated 1500 W pulse power and maintain RθJA = 75 °C/W. Use internal thermal vias beneath pads if layer stack permits, and avoid narrow traces-this layout is validated in the datasheet's derating curves (Fig. 2) and directly impacts SMCJ51AHM3/H reliability under repetitive surge conditions.
SMCJ51AHM3/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:
- Discontinued at Digi-Key
- 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):
- 18.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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)
SMCJ51AHM3/H FAQ
1.How can I place an order for SMCJ51AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51AHM3/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 SMCJ51AHM3/H reliable?
The price and inventory of SMCJ51AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51AHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ51AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51AHM3/H?
SMCJ51AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51AHM3/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 SMCJ51AHM3/H?
For technical support, including SMCJ51AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51AHM3/H requirements.
6.How does Aetrix verify that SMCJ51AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ51AHM3/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 SMCJ51AHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ51AHM3/H?
All SMCJ51AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51AHM3/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 SMCJ51AHM3/H part is unused and in its original packaging.
Return procedure for SMCJ51AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51AHM3/H Tags
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