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Vishay General Semiconductor - Diodes Division SMCJ51CAHE3/9AT
- Part No.:
- SMCJ51CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51CAHE3/9AT.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,494
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Product details
Overview
SMCJ51CAHE3/9AT from Vishay General Semiconductor is a bidirectional 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 sensitive signal lines in automotive sensor units and industrial I/O interfaces against lightning-induced transients and inductive switching spikes.
For engineers reviewing the SMCJ51CAHE3/9AT datasheet, SMCJ51CAHE3/9AT pinout, SMCJ51CAHE3/9AT application, or SMCJ51CAHE3/9AT equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, 1500 W surge rating under 10/1000 µs waveform, low thermal resistance (RθJL = 15 °C/W), and RoHS-compliant matte tin-plated leads solderable per J-STD-002.
Technical Context
This device operates as a voltage-clamped crowbar during overvoltage events, leveraging an avalanche breakdown mechanism with bidirectional symmetry-ensuring identical VBR (56.7–62.7 V) and VC behavior in both polarities. Its glass-passivated junction enables stable breakdown characteristics and fast response time (<1 ns).
Designed for surface-mount placement on PCBs with 8.0 mm × 8.0 mm copper pads per terminal, it supports automated assembly and meets MSL Level 1 (260 °C peak reflow). The SMCJ51CAHE3/9AT variant is AEC-Q101 qualified and halogen-free compliant per Vishay's HM3/HE3 suffix designation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 56.7 V / 62.7 V - Breakdown occurs within this range at 1 mA test current, ensuring predictable turn-on |
| VC @ IPPM | 82.4 V - Clamped voltage across device at 18.2 A peak pulse current, limiting downstream stress |
| PPPM | 1500 W - Peak surge power handling capability under standardized 10/1000 µs waveform |
| RθJL | 15 °C/W - Low junction-to-lead thermal resistance enables efficient heat transfer to PCB copper |
| TJ max | +150 °C - Maximum junction temperature rating supports operation in under-hood automotive environments |
| IEC 61000-4-5 | Compliant - Validated for surge immunity testing up to 4 kV line-to-ground (indirect) |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H), with matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as cathode during positive transients and anode during negative transients - symmetrical conduction |
| Cathode | Transient return path (bidirectional) | Acts as anode during positive transients and cathode during negative transients - no band marking required |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance in both directions eliminates need for polarity-aware layout |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| Low incremental surge resistance | Enables tighter VC control under high-current surges, reducing voltage overshoot on protected ICs |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak without moisture-related damage |
| Glass passivated junction | Provides stable leakage current (<1 µA at VWM) and long-term parameter stability across temperature and lifetime |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) in engine control modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, absorbing energy from ESD and switching transients. Use Value: Maintains signal integrity by limiting transient voltage to ≤82.4 V while surviving repeated 1500 W surges per IEC 61000-4-5. | Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field wiring subject to inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Parallel-connected TVS suppressing voltage spikes before they reach optocoupler input stages or microcontroller GPIOs. Use Value: Prevents latch-up and permanent damage to downstream logic by clamping transients within 1 ns, with no degradation after 1000+ surge events. |
| Telecom Line Protection | Consumer Power Adapter Input |
Use Scenario: Shielding Ethernet PHY interface lines (e.g., RJ45 magnetics secondary side) from lightning-induced surges in outdoor access points. IC Role / Device Role / Timing Role: Secondary-side TVS mounted adjacent to connector, shunting common-mode surges to chassis ground. Use Value: Delivers 1500 W surge handling without derating at +85 °C ambient, meeting GR-1089-CORE Level 3 requirements. | Use Scenario: Protecting AC-DC adapter primary-side rectifier outputs and secondary-side 5 V/12 V rails from mains-borne transients and ESD. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across bulk capacitor terminals to clamp overvoltage during brownout recovery or MOV failure. Use Value: Ensures compliance with UL 62368-1 Annex D by limiting transient energy to safe levels for electrolytic capacitor and controller IC survival. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC51CA | Lower PPPM (600 W), same VWM/VC, smaller SMA package | Limited to lower-energy surges; unsuitable for IEC 61000-4-5 Level 4 | Select when board space is constrained and surge threat level is Class II only |
| SMCJ51CAHM3/9AT | Identical electrical specs; halogen-free version with HM3 suffix instead of HE3 | No functional difference; differs only in material compliance (halogen-free vs. standard RoHS) | Choose HM3 if full halogen-free BOM compliance is required per IPC-1752A |
Compared with SAC51CA and SMCJ51CAHM3/9AT, the SMCJ51CAHE3/9AT provides full 1500 W surge capacity in a robust SMC package with AEC-Q101 validation - making it optimal for automotive and industrial designs requiring highest reliability and energy absorption without layout change.
Availability
SMCJ51CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom infrastructure equipment, and consumer power adapters requiring stable component supply across extended production lifecycles.
Supply support for SMCJ51CAHE3/9AT 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, MOSFETs, optoelectronics, and passive components with emphasis on high-reliability and automotive-grade solutions.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments where AEC-Q101 qualification, low clamping voltage, and repeatable surge endurance are critical.
FAQ
What is the clamping voltage of the SMCJ51CAHE3/9AT under maximum rated surge current?
The SMCJ51CAHE3/9AT has a maximum clamping voltage (VC) of 82.4 V at its rated peak pulse current (IPPM) of 18.2 A under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream circuitry. The SMCJ51CAHE3/9AT maintains this clamping performance bidirectionally, supporting robust protection in AC-coupled or floating signal paths.
Is the SMCJ51CAHE3/9AT suitable for automotive applications?
Yes, the SMCJ51CAHE3/9AT is AEC-Q101 qualified and explicitly designated for automotive use via the "HE3" suffix, indicating RoHS-compliant and AEC-Q101 validated construction. It operates reliably from −55 °C to +150 °C and withstands temperature cycling, mechanical shock, and humidity bias per AEC-Q101 test conditions. The SMCJ51CAHE3/9AT is commonly deployed in engine control units, ADAS sensor interfaces, and body electronics modules.
How does the bidirectional design of the SMCJ51CAHE3/9AT affect PCB layout?
The SMCJ51CAHE3/9AT has no polarity marking and exhibits symmetrical electrical behavior in both directions, eliminating orientation constraints during placement. Unlike unidirectional TVS diodes, it requires no cathode band alignment - simplifying automated optical inspection and reducing assembly errors. This symmetry also allows use in AC signal paths or differential lines without additional routing considerations. The SMCJ51CAHE3/9AT thus reduces layout complexity while maintaining full protection coverage.
What is the thermal resistance profile of the SMCJ51CAHE3/9AT, and how does it impact power dissipation?
The SMCJ51CAHE3/9AT has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads. This low RθJL enables rapid heat transfer to the PCB, allowing sustained operation at 6.5 W power dissipation (PD) at TA = 50 °C. The SMCJ51CAHE3/9AT's thermal design supports high-reliability deployment in enclosed enclosures without forced airflow.
Does the SMCJ51CAHE3/9AT meet industry surge immunity standards?
Yes, the SMCJ51CAHE3/9AT is designed to meet IEC 61000-4-5 (surge immunity) up to 4 kV line-to-ground (indirect) and IEC 61000-4-2 (ESD) up to ±30 kV air discharge, supported by its sub-nanosecond response time and 1500 W peak pulse power rating. Its bidirectional clamping and AEC-Q101 qualification further validate compliance with automotive-specific standards such as ISO 7637-2 and ISO 16750-2. The SMCJ51CAHE3/9AT delivers certified protection without external circuitry.
SMCJ51CAHE3/9AT 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ51CAHE3/9AT FAQ
1.How can I place an order for SMCJ51CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51CAHE3/9AT 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 SMCJ51CAHE3/9AT reliable?
The price and inventory of SMCJ51CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ51CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51CAHE3/9AT?
SMCJ51CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51CAHE3/9AT 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 SMCJ51CAHE3/9AT?
For technical support, including SMCJ51CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51CAHE3/9AT requirements.
6.How does Aetrix verify that SMCJ51CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ51CAHE3/9AT 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 SMCJ51CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ51CAHE3/9AT?
All SMCJ51CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51CAHE3/9AT, 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 SMCJ51CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ51CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51CAHE3/9AT Tags
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