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Vishay General Semiconductor - Diodes Division SMCJ51AHM3_A/H
- Part No.:
- SMCJ51AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51AHM3_A/H.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,887
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Product details
Overview
SMCJ51AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount 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), 82.4 V maximum clamping voltage (VC) at 18.2 A peak pulse current (IPPM), and 1500 W peak pulse power rating with 10/1000 µs waveform - optimized for automotive and industrial electronics surge immunity.
For engineers reviewing the SMCJ51AHM3_A/H datasheet, SMCJ51AHM3_A/H pinout, SMCJ51AHM3_A/H application, or SMCJ51AHM3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), low incremental surge resistance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads per terminal.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below 51 V and rapidly transitions to low-impedance conduction above its 56.7–62.7 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ps), enabling effective suppression of ESD, lightning-induced transients, and inductive switching spikes.
The device is rated for continuous operation from –55 °C to +150 °C junction temperature, with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), supporting reliable performance under sustained surge stress when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum reverse working voltage before clamping begins; defines safe operating DC rail margin. |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 82.4 V at 18.2 A - Clamped voltage under 1500 W 10/1000 µs surge; limits downstream IC stress. |
| PPPM | 1500 W - Peak pulse power handling capacity; meets IEC 61000-4-5 Level 4 surge immunity requirements. |
| IFSM | 200 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports high-energy transient absorption. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with cathode band marking; compatible with J-STD-020 MSL level 1 reflow. |
Pinout & Package
SMCJ51AHM3_A/H uses the SMC (DO-214AB) package: a low-profile, rectangular surface-mount case with two terminals. The cathode is marked by a visible band on the body; polarity must be observed during PCB layout to ensure correct clamping direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lower-potential node; completes clamping path during reverse-biased surge events. |
| Cathode | High-side input terminal | Connected to protected line (e.g., 51 V rail); conducts avalanche current when voltage exceeds VBR. |
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 JEDEC J-STD-20 and EU RoHS Directive 2011/65/EU. |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR = ~25.7 V) and higher energy absorption efficiency per joule. |
| MSL level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing logistics. |
| Glass passivated junction | Provides stable, repeatable avalanche characteristics across temperature and lifetime with minimal parameter drift. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery-supplied ECUs against load dump and alternator transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges above 51 V while remaining transparent during normal operation. Use Value: Limits peak voltage to 82.4 V during 1500 W transients, preventing damage to downstream PMICs and microcontrollers rated for ≤100 V absolute maximum. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to ADC inputs in factory automation PLCs. IC Role / Device Role / Timing Role: TVS placed across differential signal pair or single-ended output to suppress ESD and cable discharge events. Use Value: Sub-nanosecond response time and low leakage (<1 µA at 51 V) preserve signal integrity and measurement accuracy without loading the sensor. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Securing 48 V PoE-powered network switches against induced surges from nearby lightning strikes or AC line coupling. IC Role / Device Role / Timing Role: Primary clamping device on main DC input rail upstream of DC/DC converters. Use Value: 1500 W rating handles multi-kV transients defined in IEC 61000-4-5; SMC package allows compact layout near connector entry point. | Use Scenario: Adding secondary-level surge protection on 5 V USB VBUS lines in smart home hubs exposed to user-handled cables. IC Role / Device Role / Timing Role: Secondary TVS after primary common-mode choke, configured unidirectionally to avoid forward conduction during normal 5 V operation. Use Value: 51 V standoff avoids false triggering during USB PD negotiation; 82.4 V clamping prevents latch-up in USB controller ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51AHE3_A/H | Same VWM/VC specs but 600 W PPPM; SMB package (smaller footprint, lower thermal mass) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 4 | Select only when space-constrained and surge threat level is ≤600 W. |
| SMCJ51AHE3_A/H | Identical electrical specs and SMC package, but RoHS-compliant commercial grade (E3) without halogen-free certification | Not qualified to AEC-Q101; not approved for automotive production use | Choose for cost-sensitive industrial or consumer designs where halogen-free is not mandated. |
Compared with SMCJ51AHM3_A/H, SMBJ51AHE3_A/H offers reduced surge capacity in a smaller package, while SMCJ51AHE3_A/H provides identical protection performance without halogen-free or automotive qualification - making the HM3 variant the sole choice for AEC-Q101-compliant automotive deployments requiring full material compliance.
Availability
SMCJ51AHM3_A/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, and telecom DC input protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMCJ51AHM3_A/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, MOSFETs, and protection devices with emphasis on high-reliability, high-efficiency solutions.
The SMCJ series is engineered specifically for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, AEC-Q101 validation, and precise clamping performance are critical.
FAQ
What is the clamping voltage of SMCJ51AHM3_A/H at its rated peak pulse current?
The SMCJ51AHM3_A/H has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current of 18.2 A using the standard 10/1000 µs waveform. This value is measured under specified test conditions per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ51AHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMCJ51AHM3_A/H qualified for automotive applications?
Yes, SMCJ51AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified variants). It undergoes rigorous stress testing including temperature cycling, high-temperature operating life, and mechanical shock - making it suitable for under-hood and chassis-mounted automotive electronics where reliability under thermal and vibration stress is mandatory. The SMCJ51AHM3_A/H meets all applicable AEC-Q101 test requirements.
What does the "HM3" suffix indicate in SMCJ51AHM3_A/H?
The "HM3" suffix in SMCJ51AHM3_A/H indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering nomenclature, HM3 denotes compliance with JEDEC J-STD-20 MSL level 1, JESD 201 class 2 whisker resistance, and full automotive reliability validation - distinguishing it from commercial-grade E3 variants. The SMCJ51AHM3_A/H is therefore certified for both environmental compliance and mission-critical automotive deployment.
Can SMCJ51AHM3_A/H be used in bidirectional configurations?
No, SMCJ51AHM3_A/H is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix in its base part number and the presence of a cathode band marking. Bidirectional operation requires the "CA" suffix (e.g., SMCJ51CA), which lacks polarity marking and exhibits symmetric breakdown in both directions. Using SMCJ51AHM3_A/H in bidirectional circuits would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit. Always verify polarity alignment for SMCJ51AHM3_A/H.
What is the thermal resistance of SMCJ51AHM3_A/H, and how does it affect PCB layout?
The SMCJ51AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. These values assume mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain safe junction temperatures during repeated surges, PCB layout must replicate this minimum pad area and ensure adequate copper pour connectivity. Reducing pad size increases RθJA, risking thermal runaway - so the SMCJ51AHM3_A/H must be laid out per Vishay's recommended footprint.
SMCJ51AHM3_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:
- 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/H FAQ
1.How can I place an order for SMCJ51AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51AHM3_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 SMCJ51AHM3_A/H reliable?
The price and inventory of SMCJ51AHM3_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 SMCJ51AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ51AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51AHM3_A/H?
SMCJ51AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51AHM3_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 SMCJ51AHM3_A/H?
For technical support, including SMCJ51AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51AHM3_A/H requirements.
6.How does Aetrix verify that SMCJ51AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ51AHM3_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 SMCJ51AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ51AHM3_A/H?
All SMCJ51AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51AHM3_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 SMCJ51AHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ51AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51AHM3_A/H Tags
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