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Vishay General Semiconductor - Diodes Division SMCJ51AHE3_A/H
- Part No.:
- SMCJ51AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51AHE3_A/H.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,042
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Product details
Overview
SMCJ51AHE3_A/H 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), 82.4 V maximum clamping voltage (VC) at 18.2 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 µs waveform), making it suitable for automotive power supply line protection per ISO 7637-2.
For engineers reviewing the SMCJ51AHE3_A/H datasheet, SMCJ51AHE3_A/H pinout, SMCJ51AHE3_A/H application, or SMCJ51AHE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, low incremental surge resistance, 0.104 %/°C temperature coefficient of VBR, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
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 leakage (<1 µA at VWM) and fast response time (<1 ns), critical for protecting sensitive MOSFET gates and microcontroller I/O against ESD and load-dump transients.
The device is rated for 150 °C maximum junction temperature and exhibits 75 °C/W junction-to-ambient thermal resistance (RθJA) on standard PCB pads. Its unidirectional polarity-marked with a cathode band-enables asymmetric protection in DC-biased circuits without reverse conduction during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 51 V - Maximum continuous reverse voltage before significant leakage; defines operating margin for 48 V nominal systems. |
| VBR (Breakdown Voltage) | 56.7–62.7 V at 1 mA - Tight tolerance ensures predictable turn-on across temperature and production lots. |
| VC (Clamping Voltage) | 82.4 V at 18.2 A (10/1000 µs) - Limits downstream voltage stress during surge events; enables safe operation of 60 V-rated components. |
| PPPM (Peak Pulse Power) | 1500 W - Sustains high-energy transients such as ISO 7637-2 Pulse 5a (load dump) without failure. |
| IPPM (Peak Pulse Current) | 18.2 A - Quantifies surge current handling capability under standardized 10/1000 µs waveform. |
| TJ max. | 150 °C - Supports operation in under-hood automotive environments and industrial enclosures. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with J-STD-020 MSL Level 1. |
Pinout & Package
SMCJ51AHE3_A/H uses the SMC (DO-214AB) surface-mount package: a 2-terminal, non-polarized outline with cathode marked by a band on one end. The device has no internal pins; terminals are formed by the anode and cathode leads extending from opposite ends of the molded body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line; conducts transient energy to ground when VLINE exceeds VBR. |
| Anode (unmarked end) | Reference node | Typically tied to system ground or lower potential rail; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power supplies. |
| Glass passivated junction | Ensures long-term reliability and stable VBR drift under thermal cycling and humidity exposure. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for downstream ICs. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking or special handling. |
| Matte tin-plated leads | Supports solderability per J-STD-002 and JESD 22-B102; eliminates whisker risk per JESD 201 Class 2. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Clamping diode placed between battery rail and input filter capacitor. Use Value: Limits peak voltage to ≤82.4 V, preventing damage to 60 V-rated DC-DC controllers and CAN transceivers. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and ground near connector entry point. Use Value: Sub-1 ns response clamps ±15 kV contact ESD (IEC 61000-4-2) without distorting mV-level sensor signals. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Safeguarding PoE-powered equipment inputs from surges induced by nearby lightning strikes. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converter and hot-swap controller. Use Value: Absorbs 1500 W pulses while maintaining <1 µA leakage at 51 V, preserving standby power budget. | Use Scenario: Adding secondary-level surge immunity to USB-C power delivery circuits in laptops and docking stations. IC Role / Device Role / Timing Role: Unidirectional clamp on VBUS line to limit overvoltage during adapter plug-in or fault conditions. Use Value: Withstands repeated 10/1000 µs surges up to 18.2 A without degradation, supporting 5-year product lifecycle. |
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 | Lower PPPM (600 W), smaller SMB package (DO-214AA), same VWM/VC specs. | Reduced surge energy handling; suitable only for low-risk consumer interfaces, not automotive load dump. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-5 Level 3 (0.5 kV). |
| SMCJ51CAHE3_A/H | Bidirectional variant; identical VWM, VBR, and VC, but symmetric clamping in both polarities. | Required for AC-coupled or floating signal lines where reverse polarity transients occur. | Choose for RS-485, CAN FD, or audio line protection where bidirectional clamping is mandatory. |
Compared with SMCJ51AHE3_A/H, SMBJ51AHE3_A/H offers space savings at the cost of 60 % lower surge power rating, while SMCJ51CAHE3_A/H provides polarity-agnostic protection essential for differential signaling-neither is pin-compatible due to different polarity marking and functional scope.
Availability
SMCJ51AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, telecom power supplies, and consumer USB-C PD designs requiring stable component supply and AEC-Q101 compliance.
Supply support for SMCJ51AHE3_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 reliability, efficiency, and automotive-grade qualification.
The SMCJ series is engineered specifically for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against load dump, ESD, and lightning-induced surges is mission-critical.
FAQ
What is the clamping voltage of SMCJ51AHE3_A/H at its rated peak pulse current?
The SMCJ51AHE3_A/H has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated 18.2 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured at TA = 25 °C on 8.0 mm × 8.0 mm copper pads and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ51AHE3_A/H maintains this clamping performance across its full operating temperature range.
Is SMCJ51AHE3_A/H qualified for automotive use?
Yes, SMCJ51AHE3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet 88394. This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and surge robustness-making the SMCJ51AHE3_A/H suitable for under-hood and chassis-mounted automotive applications including body control modules and infotainment power supplies.
What does the "_A/H" suffix mean in SMCJ51AHE3_A/H?
The "_A/H" suffix in SMCJ51AHE3_A/H indicates packaging configuration: "A" denotes the revision code (per Vishay's revision tracking), and "H" specifies the preferred package code for 7-inch tape-and-reel delivery with 850 units per reel. This matches Vishay's official ordering information table, where SMCJ51AHE3_A/H is listed with unit weight 0.211 g and delivery mode "7\" diameter plastic tape and reel".
How does SMCJ51AHE3_A/H differ from SMCJ51CAHE3_A/H?
SMCJ51AHE3_A/H is unidirectional, with a cathode band and asymmetric conduction (conducts only when anode is more positive than cathode), whereas SMCJ51CAHE3_A/H is bidirectional and clamps in both polarities. Their VWM, VBR, and VC values are identical, but SMCJ51CAHE3_A/H lacks polarity marking and is used for AC or floating lines. The SMCJ51AHE3_A/H cannot substitute for the CA version in bidirectional applications without circuit redesign.
What is the thermal resistance of SMCJ51AHE3_A/H, and how does it affect layout?
The SMCJ51AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended pad layout (0.31″ × 0.31″ copper pads per terminal). To maintain TJ ≤ 150 °C during repetitive surges, PCB layout must provide adequate copper area and avoid thermal bottlenecks. Derating curves in the SMCJ51AHE3_A/H datasheet show power capability drops significantly above 25 °C ambient, so thermal design is critical in enclosed or high-temperature environments.
SMCJ51AHE3_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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ51AHE3_A/H FAQ
1.How can I place an order for SMCJ51AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51AHE3_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 SMCJ51AHE3_A/H reliable?
The price and inventory of SMCJ51AHE3_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 SMCJ51AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ51AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51AHE3_A/H?
SMCJ51AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51AHE3_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 SMCJ51AHE3_A/H?
For technical support, including SMCJ51AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51AHE3_A/H requirements.
6.How does Aetrix verify that SMCJ51AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ51AHE3_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 SMCJ51AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ51AHE3_A/H?
All SMCJ51AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51AHE3_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 SMCJ51AHE3_A/H part is unused and in its original packaging.
Return procedure for SMCJ51AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51AHE3_A/H Tags
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