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Vishay General Semiconductor - Diodes Division SMCJ51AHE3/9AT
- Part No.:
- SMCJ51AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51AHE3/9AT.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,457
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Product details
Overview
SMCJ51AHE3/9AT from Vishay General Semiconductor is a unidirectional 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. It protects MOSFETs, ICs, and sensor signal lines in automotive powertrain control units against inductive switching transients.
For engineers reviewing the SMCJ51AHE3/9AT datasheet, SMCJ51AHE3/9AT pinout, SMCJ51AHE3/9AT application, or SMCJ51AHE3/9AT equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 1500 W 10/1000 μs surge capability, and RoHS-compliant matte tin-plated leads suitable for automated SMT placement on industrial and automotive PCBs.
Technical Context
This TVS diode operates as a clamping device triggered by reverse-biased avalanche breakdown above its 51 V stand-off voltage, delivering sub-nanosecond response to transient overvoltages. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance under repetitive surge stress.
Designed for surface-mount applications, the SMCJ51AHE3/9AT meets MSL level 1 per J-STD-020 with 260 °C lead-free reflow compatibility and supports bidirectional variants via CA suffix (e.g., SMCJ51CA), though this part is strictly unidirectional with cathode band marking.
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 avalanche initiation range under DC test conditions |
| Clamping Voltage (VC) | 82.4 V at 18.2 A IPPM - Peak voltage seen by protected circuit during 10/1000 μs surge |
| Peak Pulse Power (PPPM) | 1500 W - Energy-handling capacity for standardized 10/1000 μs waveform |
| Operating Temperature | -55 °C to +150 °C - Validated junction temperature range for automotive under-hood use |
| Package | SMC (DO-214AB) - 7.75 mm × 6.22 mm body with 2.06 mm lead spacing, UL 94 V-0 rated molding |
| AEC-Q101 Qualified | Yes - Certified for automotive electronic systems per stress test requirements |
Pinout & Package
SMCJ51AHE3/9AT uses the standard SMC (DO-214AB) surface-mount package with two terminals: anode and cathode. Polarity is marked by a cathode band on the body end. The device is unidirectional only; no internal symmetry or dual-direction functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal | Connected to protected line; conducts during overvoltage to clamp to VC |
| Anode | Reference/ground return | Typically tied to system ground or low-impedance return path for surge current dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive powertrain, body control, and ADAS modules requiring reliability under thermal cycling and vibration |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift in humid environments |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a) |
| MSL Level 1 rating | Enables direct placement into lead-free reflow without baking, reducing manufacturing overhead |
| Matte tin-plated leads | Guarantees solderability per J-STD-002 and JESD 22-B102, eliminating intermetallic growth concerns |
Applications
| Automotive Powertrain Control | Industrial Motor Drive Protection |
|---|---|
Use Scenario: Protecting MCU I/O and gate drivers in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Clamping transient spikes on 12 V supply rails and CAN bus termination lines. Use Value: Prevents latch-up or permanent damage to 5 V logic interfaces during 35 V/100 ms load dump events. | Use Scenario: Safeguarding microcontroller reset lines and analog sensor inputs in variable-frequency drives. IC Role / Device Role / Timing Role: Shunting inductive kickback from relay coils and solenoid actuators. Use Value: Maintains system uptime by limiting voltage excursions to <83 V during 100 A/10 ms surges. |
| Telecom Power Interface | Automotive Body Electronics |
Use Scenario: Shielding PoE-powered Ethernet PHYs and DC-DC converters from lightning-induced surges on 48 V input rails. IC Role / Device Role / Timing Role: Front-end transient suppression before primary DC-DC regulation stage. Use Value: Enables compliance with IEC 61000-4-5 Level 4 (4 kV line-earth) without additional series impedance. | Use Scenario: Securing LIN bus transceivers and ambient light sensor outputs in door module assemblies. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) clamping on 5 V data lines adjacent to high-current loads. Use Value: Preserves signal integrity while meeting ISO 16750-2 pulse 5a requirements for battery disconnect transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-E3/61T | Lower PPPM (400 W), smaller SMA package, same VWM/VBR/VC specs | Not AEC-Q101 qualified; limited to commercial-grade consumer/industrial use | Select when board space is constrained and automotive qualification is unnecessary |
| SMCJ51A-M3/9AT | Halogen-free variant with identical electrical specs and AEC-Q101 qualification | Same mechanical and thermal performance; differs only in material composition (RoHS + halogen-free) | Choose for compliance-sensitive programs requiring halogen-free BOMs |
Compared with SMCJ51AHE3/9AT, SMAJ51A-E3/61T offers reduced surge robustness in a smaller footprint, while SMCJ51A-M3/9AT provides identical protection performance with halogen-free construction-both require no PCB layout change but differ in qualification scope and environmental compliance.
Availability
SMCJ51AHE3/9AT is available at Aetrix Electronics and suitable for automotive powertrain control, industrial motor drive protection, and telecom power interface designs requiring stable component supply, long-term lifecycle support, and AEC-Q101 assurance.
Supply support for SMCJ51AHE3/9AT 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 and application-specific optimization.
The SMCJ series targets high-energy transient suppression in harsh environments, engineered specifically for automotive, industrial, and telecom infrastructure where 1500 W surge handling and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMCJ51AHE3/9AT at its rated peak pulse current?
The SMCJ51AHE3/9AT has a maximum clamping voltage (VC) of 82.4 V at 18.2 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured across the device terminals during surge testing and defines the upper voltage limit imposed on protected circuits. The SMCJ51AHE3/9AT maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMCJ51AHE3/9AT qualified for automotive applications?
Yes, SMCJ51AHE3/9AT is AEC-Q101 qualified, confirming its suitability for automotive electronic systems including powertrain, chassis, and body control modules. The HE3 suffix explicitly denotes RoHS-compliant and AEC-Q101 qualified construction. This qualification covers stress tests such as high-temperature operating life, temperature cycling, and mechanical shock-critical for under-hood and cabin-mounted electronics where the SMCJ51AHE3/9AT is deployed.
What does the "9AT" suffix indicate in SMCJ51AHE3/9AT?
"9AT" denotes the preferred packaging configuration: 13-inch diameter plastic tape and reel, containing 3500 units per reel. This format supports high-volume automated SMT placement and is compatible with industry-standard pick-and-place equipment. The "HE3" portion confirms RoHS compliance and AEC-Q101 qualification, while "9AT" specifies logistics and handling-not electrical or thermal behavior. SMCJ51AHE3/9AT shares identical specifications with other packaging variants like SMCJ51AHE3/57T (850-unit 7-inch reel).
How does SMCJ51AHE3/9AT differ from bidirectional SMCJ51CA variants?
SMCJ51AHE3/9AT is unidirectional, with polarity marked by a cathode band and intended for DC-biased lines like power rails or single-ended signal paths. In contrast, SMCJ51CA is bidirectional, lacks polarity marking, and clamps symmetrically in both directions-suitable for AC lines or differential buses like RS-485. Their VWM (51 V), VBR (56.7–62.7 V), and VC (82.4 V) match, but SMCJ51AHE3/9AT cannot replace SMCJ51CA in AC-coupled applications without circuit redesign.
What is the thermal resistance of SMCJ51AHE3/9AT from junction to ambient?
The typical thermal resistance from junction to ambient (RθJA) for SMCJ51AHE3/9AT is 75 °C/W under standard mounting conditions-defined as 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes no heatsink and guides derating calculations: at 70 °C ambient, maximum continuous power dissipation drops to ~3.6 W. For sustained operation near TJ max (150 °C), board-level copper area and airflow must be validated, as the SMCJ51AHE3/9AT relies on PCB conduction rather than package heatsinking.
SMCJ51AHE3/9AT 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ51AHE3/9AT FAQ
1.How can I place an order for SMCJ51AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51AHE3/9AT 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 SMCJ51AHE3/9AT reliable?
The price and inventory of SMCJ51AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ51AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51AHE3/9AT?
SMCJ51AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51AHE3/9AT 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 SMCJ51AHE3/9AT?
For technical support, including SMCJ51AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51AHE3/9AT requirements.
6.How does Aetrix verify that SMCJ51AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ51AHE3/9AT 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 SMCJ51AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ51AHE3/9AT?
All SMCJ51AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51AHE3/9AT, 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 SMCJ51AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ51AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51AHE3/9AT Tags
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