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Vishay General Semiconductor - Diodes Division SMCJ78CHE3/9AT
- Part No.:
- SMCJ78CHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78CHE3/9AT.pdf
- Description:
- TVS DIODE 78VWM 139VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,357
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Product details
Overview
SMCJ78CHE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 78 V standoff voltage (VWM), 86.7–95.8 V breakdown range (VBR), 1500 W peak pulse power (PPPM), and clamps transients to ≤126 V at 11.9 A (10/1000 µs waveform). It is AEC-Q101 qualified and used to protect MOSFETs and ICs against inductive switching surges in automotive power systems.
For engineers reviewing the SMCJ78CHE3/9AT datasheet, SMCJ78CHE3/9AT pinout, SMCJ78CHE3/9AT application, or SMCJ78CHE3/9AT equivalent, key selection criteria include its 78 V working voltage, 126 V clamping performance at rated surge current, AEC-Q101 qualification for automotive reliability, RoHS-compliant HE3 suffix indicating whisker-tested matte tin plating, and DO-214AB thermal and mechanical compatibility with high-power PCB layouts.
Technical Context
The SMCJ78CHE3/9AT operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range (86.7–95.8 V at 1 mA). Its low incremental surge resistance enables tight clamping (126 V max at 11.9 A), minimizing stress on downstream components during 10/1000 µs transients.
Thermally, it supports operation from –55 °C to +150 °C junction temperature, with RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, enabling reliable power dissipation up to 6.5 W at TA = 50 °C with proper layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before conduction begins; defines system's normal operating margin. |
| VBR min/max | 86.7 V / 95.8 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lot. |
| VC @ IPPM | ≤126 V at 11.9 A (10/1000 µs) - Clamping voltage under full-rated surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 1500 W - Peak transient energy handling capability; validates suitability for ISO 7637-2 Pulse 1/2a/5a automotive load-dump events. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at 78 V; negligible power loss and signal integrity impact in standby conditions. |
| TJ max | +150 °C - Maximum junction temperature rating; supports under-hood automotive deployment with thermal derating. |
| Qualification | AEC-Q101 qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002/JESD 22-B102; polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge or bias conditions. |
| Cathode (banded end) | Reverse-blocking / clamping terminal | Connected to protected line (e.g., 12 V rail); avalanches into conduction when reverse voltage exceeds VBR, shunting surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow assembly without moisture-induced damage or popcorn effect. |
| AEC-Q101 qualification | Validates performance across automotive temperature, vibration, and lifetime requirements - no additional qualification needed for Tier 1 designs. |
| HE3 suffix | Indicates AEC-Q101 qualification and JESD 201 Class 2 whisker resistance - critical for high-reliability automotive solder joints. |
| Low incremental surge resistance | Directly contributes to tight clamping (126 V), reducing voltage overshoot and protecting downstream MOSFET gates and IC inputs. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power rails in engine control units (ECUs) and body control modules (BCMs) against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and local regulator input to absorb >100 V transients within nanoseconds. Use Value: Prevents latch-up or permanent damage to LDOs and microcontrollers during ISO 7637-2 Pulse 5a (load dump), leveraging 1500 W PPPM and 126 V VC. | Use Scenario: Safeguarding gate drivers and IGBTs in variable-frequency drives (VFDs) exposed to back-EMF from motor coil de-energization. IC Role / Device Role / Timing Role: Parallel-connected TVS at DC bus input to clamp flyback voltage spikes before they reach power stage semiconductors. Use Value: Limits voltage overshoot to ≤126 V during 11.9 A surges, preserving IGBT safe operating area (SOA) and extending system MTBF. |
| Telecom Power Supply Input | Automotive Sensor Interface Protection |
Use Scenario: Shielding primary-side DC/DC converters in telecom base station power supplies from lightning-induced surges on -48 V input lines. IC Role / Device Role / Timing Role: First-line transient suppressor at rectifier output, absorbing multi-kW pulses before bulk capacitors and controller ICs. Use Value: Withstands 1500 W peak power and maintains <1 µA leakage at 78 V, ensuring minimal standby loss and high immunity to repetitive transients. | Use Scenario: Protecting LIN/CAN transceiver supply pins and analog sensor front-ends (e.g., pressure, temperature) in automotive cabin modules. IC Role / Device Role / Timing Role: Localized TVS on 5–12 V sensor rails, placed adjacent to connector entry points to intercept ESD and cable discharge events. Use Value: AEC-Q101 qualification and 1.0 µA ID guarantee stable biasing and noise-free measurements, even after repeated 8 kV contact ESD strikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78AHE3/9AT | Lower PPPM (600 W), smaller SMB package (DO-214AA), same VWM/VBR/VC specs. | Suitable for space-constrained, lower-energy surge environments (e.g., infotainment USB ports), not load-dump duty. | Select when board area is limited and peak surge energy is ≤600 W; verify thermal margin with RθJA = 110 °C/W. |
| SMCJ78A-E3/9AT | Same electrical specs and DO-214AB package, but commercial-grade (E3 suffix), not AEC-Q101 qualified. | Acceptable for industrial or consumer applications where automotive reliability testing is not required. | Choose for cost-sensitive non-automotive designs; avoid in automotive ECUs or safety-critical modules requiring AEC-Q101 evidence. |
Compared with SMCJ78CHE3/9AT, SMBJ78AHE3/9AT trades 60% peak power and higher thermal resistance for 40% smaller footprint, while SMCJ78A-E3/9AT retains identical protection performance but omits automotive qualification - making the HE3 variant the sole choice for AEC-Q101-compliant 1500 W clamping in DO-214AB.
Availability
SMCJ78CHE3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive protection, and telecom power supply input applications requiring stable component supply, AEC-Q101 traceability, and 1500 W transient immunity.
Supply support for SMCJ78CHE3/9AT 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 reliability and ruggedness.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of the SMCJ78CHE3/9AT under full-rated surge current?
The SMCJ78CHE3/9AT clamps to a maximum of 126 V when subjected to its rated peak pulse current of 11.9 A (10/1000 µs waveform). This value is measured and guaranteed per Vishay's datasheet (Document Number: 88394, Rev. 11-Dec-12), and directly defines the upper voltage limit imposed on protected circuits during worst-case transients. The SMCJ78CHE3/9AT achieves this performance via low incremental surge resistance and optimized junction design.
Is the SMCJ78CHE3/9AT suitable for automotive applications?
Yes, the SMCJ78CHE3/9AT is explicitly AEC-Q101 qualified, as confirmed by its HE3 suffix and Vishay documentation. It meets automotive reliability requirements including temperature cycling, high-temperature reverse bias (HTRB), and ESD testing. The SMCJ78CHE3/9AT is routinely deployed in engine control units, body control modules, and ADAS power supplies where ISO 7637-2 compliance and under-hood thermal resilience are mandatory.
What does the "HE3" suffix mean in SMCJ78CHE3/9AT?
The "HE3" suffix in SMCJ78CHE3/9AT indicates two key attributes: RoHS compliance (E3) and AEC-Q101 qualification (H), with JESD 201 Class 2 whisker resistance. Unlike standard E3 parts, the "H" denotes full automotive qualification - verified through accelerated life testing and environmental stress screening. This makes the SMCJ78CHE3/9AT distinct from commercial-grade SMCJ78A-E3/9AT variants.
How does the SMCJ78CHE3/9AT differ from bi-directional SMCJ78CA variants?
The SMCJ78CHE3/9AT is unidirectional, meaning it blocks forward current and clamps only in reverse bias - ideal for DC rail protection with defined polarity. In contrast, SMCJ78CA devices are bi-directional, offering symmetrical clamping for AC lines or floating signals. The SMCJ78CHE3/9AT has a cathode band marking; SMCJ78CA parts have no polarity marking. Electrical specs like VWM and VC differ accordingly - SMCJ78CHE3/9AT uses 78 V VWM, while SMCJ78CA uses 78 V VWM but symmetric breakdown.
What is the thermal resistance of the SMCJ78CHE3/9AT, and how does it affect layout?
The SMCJ78CHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal, as specified in Vishay's datasheet. This value assumes minimum recommended pad layout; reducing pad size increases RθJA, risking thermal runaway under sustained surge duty. For reliable operation at 6.5 W dissipation, designers must allocate adequate copper area and consider airflow or heatsinking - the SMCJ78CHE3/9AT's RθJL of 15 °C/W further supports lead-based heat extraction.
SMCJ78CHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 139V
- Current - Peak Pulse (10/1000µs):
- 10.8A
- 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)
SMCJ78CHE3/9AT FAQ
1.How can I place an order for SMCJ78CHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78CHE3/9AT 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 SMCJ78CHE3/9AT reliable?
The price and inventory of SMCJ78CHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78CHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ78CHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78CHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78CHE3/9AT?
SMCJ78CHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78CHE3/9AT 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 SMCJ78CHE3/9AT?
For technical support, including SMCJ78CHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78CHE3/9AT requirements.
6.How does Aetrix verify that SMCJ78CHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ78CHE3/9AT 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 SMCJ78CHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ78CHE3/9AT?
All SMCJ78CHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78CHE3/9AT, 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 SMCJ78CHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ78CHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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