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Vishay General Semiconductor - Diodes Division SMCJ51AHM3/I
- Part No.:
- SMCJ51AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51AHM3/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,763
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Product details
Overview
SMCJ51AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 51 V standoff voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 82.4 V clamping voltage (VC) at 18.2 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ51AHM3/I datasheet, SMCJ51AHM3/I pinout, SMCJ51AHM3/I application, or SMCJ51AHM3/I equivalent, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, halogen-free RoHS compliance, and real-world clamping performance under surge transients - critical for ESD/surge co-design in high-reliability 12–48 V systems.
Technical Context
The SMCJ51AHM3/I operates as a silicon avalanche diode with glass-passivated junction, delivering sub-nanosecond response to transient events. Its unidirectional polarity enables asymmetric clamping on positive-going surges while blocking reverse leakage ≤1.0 µA at 51 V standoff.
Thermal design relies on RθJA = 75 °C/W (typ.) and RθJL = 15 °C/W (typ.), with derating above 25 °C per Figure 2; maximum junction temperature is 150 °C, and it meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V nominal systems. |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - guaranteed avalanche onset range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 82.4 V at 18.2 A - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient stress level. |
| PPPM | 1500 W - peak surge power handling capability; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) compliance with proper PCB layout. |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage at rated standoff; minimizes standby power loss in battery-backed or low-power sensor nodes. |
| TJ max | +150 °C - extended junction temperature rating enabling use in under-hood automotive or enclosed industrial enclosures. |
| Package | SMC (DO-214AB) - surface-mount outline with 8.0 mm × 8.0 mm copper pad requirement; supports automated placement and high-current thermal dissipation. |
Pinout & Package
SMCJ51AHM3/I uses the standard SMC (DO-214AB) package: molded plastic body with matte tin-plated leads, cathode indicated by a band on the case. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per Vishay specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to system ground or return path; carries full surge current during clamping event. |
| Cathode | High-side connection point | Connected to protected line (e.g., 48 V rail); blocks reverse leakage up to 51 V, avalanches above VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - suitable for engine control, ADAS, and infotainment power rails. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms halogen-free molding compound and lead finish - meets EU ELV and IPC-1752a material declaration requirements. |
| Low incremental surge resistance | Enables tight VC/VBR ratio (82.4 V / 56.7 V ≈ 1.45), minimizing voltage overshoot during fast transients compared to higher-ratio TVS devices. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies SMT line integration and reduces manufacturing overhead. |
| Glass-passivated junction | Provides stable VBR tolerance and long-term parameter stability under thermal stress and humidity exposure - critical for 15-year industrial deployments. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-supplied microcontroller power inputs in vehicle body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between VIN and GND, activated within <1 ns upon exceeding 56.7 V. Use Value: Limits transient voltage to ≤82.4 V during 1500 W surges, preventing latch-up or gate oxide damage in downstream PMICs and MCUs. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to inductive switching noise from solenoids and contactors. IC Role / Device Role / Timing Role: Standoff protector on field-side signal line, conducting only during >56.7 V transients while leaking <1 µA at 24 V steady state. Use Value: Maintains signal integrity during normal operation and clamps 10/1000 µs surges to safe levels without affecting logic thresholds or causing false triggering. |
| Telecom DC Power Feeds | Medical Sensor Interface Protection |
|
Use Scenario: Shielding -48 V DC power feeds in remote radio units from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC/DC converters, absorbing energy before downstream filtering. Use Value: Handles repeated 1500 W pulses with minimal degradation, supporting IEC 61000-4-5 compliance when paired with series impedance. |
Use Scenario: Protecting analog front-end inputs of patient-monitoring sensors connected to external leads susceptible to ESD and defibrillation pulses. IC Role / Device Role / Timing Role: Low-leakage transient clamp on signal path, selected for 1 µA max ID to avoid DC offset errors in precision amplifiers. Use Value: Provides 82.4 V clamping ceiling while contributing negligible error (<0.1 µA typical leakage) to µV-level biopotential measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC51-03 | Lower PPPM (600 W), smaller SOD-323 package, higher VBR tolerance (±10%) | Better suited for space-constrained low-energy signal lines, not power rails | Select SAC51-03 only for <500 W surge environments where board area is critical and clamping voltage margin allows. |
| 1.5KE51A | Through-hole DO-201 package, same VWM/VBR/VC specs, higher RθJA (100 °C/W) | Requires manual or wave soldering; less suitable for high-volume SMT production | Choose 1.5KE51A only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SAC51-03 and 1.5KE51A, the SMCJ51AHM3/I uniquely combines AEC-Q101 qualification, halogen-free construction, SMC package thermal performance (RθJL = 15 °C/W), and 1500 W surge capacity - making it the preferred choice for production-grade automotive and industrial SMT power rail protection.
Availability
SMCJ51AHM3/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom power supplies, and medical sensor interfaces requiring stable component supply, long-lifecycle support, and traceable halogen-free sourcing.
Supply support for SMCJ51AHM3/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, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where sustained surge immunity and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMCJ51AHM3/I at its rated peak pulse current?
The SMCJ51AHM3/I has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current (IPPM) of 18.2 A using the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuits during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMCJ51AHM3/I maintains this clamping performance across its full operating temperature range.
Is SMCJ51AHM3/I qualified for automotive applications?
Yes, the SMCJ51AHM3/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 high-temperature reverse bias, temperature cycling, and surge endurance - validating its suitability for under-hood and chassis-mounted automotive electronics. The SMCJ51AHM3/I is explicitly designated for automotive-grade power rail protection in ECUs, ADAS modules, and body control units.
What does the "HM3" suffix mean in SMCJ51AHM3/I?
The "HM3" suffix in SMCJ51AHM3/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Specifically, "H" denotes AEC-Q101 compliance, "M" signifies halogen-free materials, and "3" confirms RoHS compliance per EU Directive 2011/65/EU. This distinguishes it from commercial-grade "M3" variants and ensures full alignment with automotive and green electronics regulatory requirements - a key differentiator for SMCJ51AHM3/I in Tier 1 supply chains.
How does SMCJ51AHM3/I compare to bidirectional TVS diodes like SMCJ51CA?
The SMCJ51AHM3/I is unidirectional and optimized for DC power line protection where polarity is fixed - offering lower leakage (<1.0 µA at 51 V) and tighter VBR tolerance than its bidirectional counterpart SMCJ51CA. In contrast, SMCJ51CA supports AC or floating signal lines but exhibits doubled ID (≤2.0 µA) for VWM ≤10 V devices and symmetric clamping. For 48 V DC rails, the SMCJ51AHM3/I provides superior leakage performance and is the correct selection unless bipolar transients are expected.
What PCB layout guidance applies to SMCJ51AHM3/I for optimal surge handling?
Vishay specifies that SMCJ51AHM3/I must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated 1500 W peak pulse power. Traces should be short and wide to minimize inductance; ground connections must tie directly to solid ground planes. Thermal vias under pads improve heat dissipation during repetitive surges. Failure to meet pad size requirements degrades IPPM and VC performance - the SMCJ51AHM3/I's published specs assume this layout.
SMCJ51AHM3/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:
- 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/I FAQ
1.How can I place an order for SMCJ51AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51AHM3/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/I reliable?
The price and inventory of SMCJ51AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMCJ51AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51AHM3/I?
SMCJ51AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51AHM3/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/I?
For technical support, including SMCJ51AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51AHM3/I requirements.
6.How does Aetrix verify that SMCJ51AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ51AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMCJ51AHM3/I?
All SMCJ51AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51AHM3/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/I part is unused and in its original packaging.
Return procedure for SMCJ51AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51AHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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