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Vishay General Semiconductor - Diodes Division SMCJ51AHM3_A/I
- Part No.:
- SMCJ51AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51AHM3_A/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,560
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Product details
Overview
SMCJ51AHM3_A/I 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 (VWM), 82.4 V clamping voltage (VC) at 18.2 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning-induced surges in automotive and industrial power rails.
For engineers reviewing the SMCJ51AHM3_A/I datasheet, SMCJ51AHM3_A/I pinout, SMCJ51AHM3_A/I application, or SMCJ51AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), 150 °C max junction temperature, and verified clamping performance under 10/1000 μs waveform conditions.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 56.7–62.7 V breakdown range (VBR) at 1 mA test current. Its low incremental surge resistance and fast response time ensure effective suppression of transient energy before downstream components are stressed.
Thermal design relies on its 15 °C/W junction-to-lead thermal resistance (RθJL) and 75 °C/W junction-to-ambient rating (RθJA) under standard 8.0 mm × 8.0 mm copper pad layout. The device is rated for non-repetitive 200 A forward surge current (IFSM) and operates across -55 °C to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR min/max | 56.7 V / 62.7 V - Breakdown voltage range at 1 mA; ensures reliable turn-on within specified tolerance. |
| VC @ IPPM | 82.4 V - Clamped voltage at 18.2 A peak pulse current; determines maximum stress imposed on protected circuit. |
| PPPM | 1500 W - Peak pulse power handling capability under 10/1000 μs waveform; quantifies transient energy absorption capacity. |
| ID @ VWM | 1.0 μA - Reverse leakage at 51 V; negligible power loss and minimal impact on high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial environments. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated placement. |
Pinout & Package
SMCJ51AHM3_A/I uses the standard SMC (DO-214AB) package: two-terminal, unidirectional configuration with cathode indicated by a band on the body. Leads are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-potential node; completes clamping path during overvoltage events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 51 V rail); polarity-sensitive-reversal prevents clamping function. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with IEC 61249-2-21 and JEDEC J-STD-20 reflow profiles up to 260 °C peak. |
| Low clamping ratio (VC/VBR) | ~1.42 (82.4 V / 58.2 V typical) - Minimizes overvoltage overshoot during transient events. |
| MSL Level 1 | No floor life limitation; safe for unlimited exposure to ambient conditions prior to reflow soldering. |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 12 V/24 V battery-fed ECUs exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp transients above 51 V. Use Value: Limits voltage seen by downstream LDOs and microcontrollers to ≤82.4 V during 1500 W surges, preventing latch-up or gate oxide damage. |
Use Scenario: Analog output lines from pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: TVS connected across signal and ground to suppress ESD and inductive coupling from nearby motor drives. Use Value: With only 1.0 μA leakage at 51 V, it avoids loading high-impedance sensor outputs while clamping fast transients to safe levels. |
| Telecom DC Power Input Protection | Consumer Device USB Power Input Protection |
|
Use Scenario: -48 V telecom rectifier outputs subject to lightning-induced surges on outdoor plant equipment. IC Role / Device Role / Timing Role: Paired with series fuse and upstream filter to absorb multi-kW transients before reaching DC/DC converters. Use Value: 1500 W PPPM rating and 18.2 A IPPM enable single-device protection against IEC 61000-4-5 Level 4 surges without derating. |
Use Scenario: 5 V USB-C power delivery inputs in portable audio devices vulnerable to hot-plug transients. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp placed at connector entry point to shunt ESD and overshoot. Use Value: Fast response time and 82.4 V clamping prevent damage to USB PD controllers rated for ≤20 V absolute maximum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-E3/57T | Lower PPPM (400 W), smaller SMA package, non-AEC-Q101, higher VC (93.6 V at 4.3 A). | Suitable for cost-sensitive consumer electronics where surge energy is lower and automotive qualification is not required. | Select when board space is constrained and transient threat level is below IEC 61000-4-5 Level 2. |
| SMCJ51AHE3_A/I | Same electrical specs but RoHS-compliant commercial grade (E3), not halogen-free or AEC-Q101 qualified. | Applicable in industrial control panels where halogen-free mandate or automotive qualification is absent. | Choose when supply chain requires legacy E3 suffix and AEC-Q101 is not mandated by end-customer. |
Compared with SMCJ51AHM3_A/I, SMAJ51A-E3/57T offers reduced surge robustness in a smaller footprint, while SMCJ51AHE3_A/I provides identical clamping performance without halogen-free or automotive qualification-making SMCJ51AHM3_A/I the optimal choice for AEC-Q101-compliant, high-reliability 51 V rail protection.
Availability
SMCJ51AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power input stages requiring stable component supply with full traceability and lifecycle management.
Supply support for SMCJ51AHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where robust overvoltage protection is mission-critical.
FAQ
What is the clamping voltage of SMCJ51AHM3_A/I under standard test conditions?
The SMCJ51AHM3_A/I has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated 18.2 A peak pulse current (IPPM) using a 10/1000 μs waveform. This value is measured at TA = 25 °C on standard 8.0 mm × 8.0 mm copper pads and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ51AHM3_A/I maintains this clamping performance across its operational temperature range.
Is SMCJ51AHM3_A/I qualified for automotive applications?
Yes, SMCJ51AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88394. This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing (UHAST), making the SMCJ51AHM3_A/I suitable for under-hood and chassis-mounted automotive electronics.
What does the 'HM3' suffix indicate in SMCJ51AHM3_A/I?
The 'HM3' suffix in SMCJ51AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade E3 versions and confirms compliance with JEDEC J-STD-20 reflow profiles (peak 260 °C), MSL Level 1 handling, and JESD 201 Class 2 whisker resistance-critical for long-life automotive and industrial deployments.
How does SMCJ51AHM3_A/I differ from bidirectional variants like SMCJ51CA?
SMCJ51AHM3_A/I is unidirectional and features polarity marking (cathode band), enabling use in DC circuits where reverse conduction must be blocked. In contrast, SMCJ51CA is bidirectional with no polarity marking and symmetric clamping in both directions-used in AC or floating signal lines. Their VWM (51 V), VBR, and PPPM (1500 W) are identical, but SMCJ51AHM3_A/I cannot replace SMCJ51CA in AC applications without circuit redesign.
What is the thermal resistance profile of SMCJ51AHM3_A/I?
SMCJ51AHM3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient resistance (RθJA) of 75 °C/W under standard mounting conditions (0.31" × 0.31" copper pads). These values inform PCB layout decisions: minimizing trace length to thermal pads and using internal copper planes improves heat dissipation, especially during repetitive surge events or elevated ambient temperatures.
SMCJ51AHM3_A/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):
- 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_A/I FAQ
1.How can I place an order for SMCJ51AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51AHM3_A/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 SMCJ51AHM3_A/I reliable?
The price and inventory of SMCJ51AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ51AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51AHM3_A/I?
SMCJ51AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51AHM3_A/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 SMCJ51AHM3_A/I?
For technical support, including SMCJ51AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51AHM3_A/I requirements.
6.How does Aetrix verify that SMCJ51AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ51AHM3_A/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 SMCJ51AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ51AHM3_A/I?
All SMCJ51AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51AHM3_A/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 SMCJ51AHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ51AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51AHM3_A/I Tags
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