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Vishay General Semiconductor - Diodes Division SMCJ78CHE3/57T
- Part No.:
- SMCJ78CHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78CHE3/57T.pdf
- Description:
- TVS DIODE 78VWM 139VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,116
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Product details
Overview
SMCJ78CHE3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 78 V stand-off voltage (VWM), 86.7–95.8 V breakdown range (VBR), 1500 W peak pulse power (PPPM), clamping voltage of 126 V at 11.9 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMCJ78CHE3/57T datasheet, SMCJ78CHE3/57T pinout, SMCJ78CHE3/57T application, or SMCJ78CHE3/57T equivalent, key selection criteria include clamping performance under 10/1000 µs surge, thermal resistance (RθJA = 75 °C/W), RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ78CHE3/57T operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR (min 86.7 V) to clamp transients to ≤126 V at rated IPPM. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at 78 V), while MSL Level 1 rating supports lead-free reflow up to 260 °C.
Designed for single-pulse surge suppression per IEC 61000-4-5 (10/1000 µs waveform), it delivers 11.9 A peak pulse current (IPPM) with low incremental surge resistance and fast response time - critical for protecting MOSFETs, ICs, and sensor interfaces against inductive switching and lightning-induced transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 86.7 V / 95.8 V - guaranteed avalanche breakdown range at 1 mA test current |
| VC @ IPPM | 126 V - clamped voltage during 11.9 A 10/1000 µs surge, defining protected circuit stress level |
| PPPM | 1500 W - peak transient power handling capability under standard surge waveform |
| ID @ VWM | <1.0 µA - ultra-low reverse leakage ensures minimal standby power loss |
| TJ max. | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, used to calculate safe power derating above 25 °C |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with cathode band marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, qualified to JESD 201 Class 2 whisker test (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode (banded end) | Avalanche clamping terminal | Connected to protected line (e.g., 78 V rail); conducts during overvoltage to shunt surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| Glass-passivated junction | Ensures stable VBR tolerance, low leakage drift, and long-term stability under thermal stress |
| MSL Level 1 (260 °C peak) | Enables compatibility with standard lead-free reflow profiles without moisture-related popcorn failure |
| Low RθJL (15 °C/W) | Supports efficient heat transfer from junction to PCB copper pads, improving surge endurance |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed industrial and automotive enclosures |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 78 V battery-derived supply rails in ADAS camera modules and radar ECUs from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rail and chassis ground to clamp transients before they reach PMICs and microcontrollers. Use Value: Clamps 1500 W surges to ≤126 V, preserving downstream 100 V-rated input stages and meeting OEM EMC immunity requirements. | Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in factory automation PLCs exposed to relay coil flyback. IC Role / Device Role / Timing Role: Standoff-connected TVS on sensor signal lines (e.g., 4–20 mA loop) to absorb inductive kickback without affecting DC accuracy. Use Value: Sub-1 µA leakage at 78 V ensures <0.1% error in high-impedance measurement paths; fast response prevents latch-up in op-amps. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Protection |
Use Scenario: Shielding 78 V PoE++ or telecom rectifier outputs from lightning-induced surges on outdoor cabinet feeds. IC Role / Device Role / Timing Role: Primary-level TVS on DC input stage upstream of DC/DC converters and hot-swap controllers. Use Value: 1500 W PPPM rating handles Category A/B surge tests; UL 94 V-0 housing meets telecom fire safety standards. | Use Scenario: Protecting high-side gate drivers in 78 V BLDC motor inverters from Miller-induced voltage spikes during switching transitions. IC Role / Device Role / Timing Role: Localized TVS across gate-to-source of SiC MOSFET drivers to suppress dV/dt overshoot and prevent false turn-on. Use Value: 126 V clamping limits gate stress below 130 V absolute max rating; DO-214AB footprint allows compact layout near driver IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78AHE3/52T | Lower PPPM (600 W), smaller SMB package (DO-214AA), same VWM/VBR/VC specs | Suitable only for lower-energy transients; limited thermal mass reduces surge endurance | Select when board space is constrained and surge threat level is ≤600 W (e.g., consumer IoT, not automotive) |
| SMCJ78A-E3/57T | Same electrical specs and DO-214AB package, but commercial-grade (non-AEC-Q101), no HE3 whisker qualification | Lacks automotive qualification and enhanced whisker resistance; acceptable for industrial/commercial use only | Choose for cost-sensitive non-automotive designs where AEC-Q101 is not mandated |
Compared with SMCJ78A-E3/57T and SMBJ78AHE3/52T, the SMCJ78CHE3/57T uniquely combines 1500 W surge capability, AEC-Q101 qualification, and JESD 201 Class 2 whisker resistance - making it the only option qualified for under-hood automotive deployment with full 78 V system margin.
Availability
SMCJ78CHE3/57T is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMCJ78CHE3/57T 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, TVS devices, and optoelectronics with emphasis on reliability, precision, and automotive-grade validation.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where clamping accuracy, surge repeatability, and long-term stability are critical.
FAQ
What is the clamping voltage of the SMCJ78CHE3/57T and how is it measured?
The SMCJ78CHE3/57T has a maximum clamping voltage (VC) of 126 V, measured at its rated peak pulse current (IPPM) of 11.9 A under a standardized 10/1000 µs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is verified per ANSI/IEEE C62.35 test conditions with the device mounted on 8.0 mm × 8.0 mm copper pads.
Is the SMCJ78CHE3/57T suitable for automotive applications?
Yes, the SMCJ78CHE3/57T is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junction, MSL Level 1 moisture sensitivity, JESD 201 Class 2 whisker resistance (HE3 suffix), and operation up to +150 °C junction temperature - all validated per automotive reliability test plans. It is commonly deployed in ADAS, body control modules, and infotainment power supplies.
What does the "HE3" suffix indicate in SMCJ78CHE3/57T?
The "HE3" suffix denotes two key qualifications: "H" indicates AEC-Q101 qualification for automotive use, and "E3" specifies RoHS-compliant matte tin plating with JESD 201 Class 2 whisker resistance. This distinguishes it from commercial-grade "E3" parts (e.g., SMCJ78A-E3/57T) and confirms suitability for high-reliability, vibration-prone environments like automotive under-hood systems.
How does the SMCJ78CHE3/57T differ from bi-directional variants like SMCJ78CA?
The SMCJ78CHE3/57T is unidirectional and features polarity marking (cathode band); it blocks forward current and clamps only reverse overvoltages. In contrast, SMCJ78CA is bi-directional, symmetrical, and unmarked - capable of clamping surges of either polarity. The unidirectional version offers lower leakage (<1.0 µA vs. ≤1000 µA for CA types at VWM) and is preferred for DC rail protection where polarity is fixed.
What PCB layout guidance applies to the SMCJ78CHE3/57T for optimal thermal and surge performance?
For optimal performance, mount the SMCJ78CHE3/57T on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in the datasheet. Use short, wide traces to minimize inductance, avoid thermal reliefs on pads, and ensure solid inner-layer copper planes connected via multiple vias. This layout achieves the rated RθJA of 75 °C/W and sustains full 1500 W PPPM without thermal runaway.
SMCJ78CHE3/57T 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)
SMCJ78CHE3/57T FAQ
1.How can I place an order for SMCJ78CHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78CHE3/57T 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 SMCJ78CHE3/57T reliable?
The price and inventory of SMCJ78CHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78CHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ78CHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78CHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78CHE3/57T?
SMCJ78CHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78CHE3/57T 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 SMCJ78CHE3/57T?
For technical support, including SMCJ78CHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78CHE3/57T requirements.
6.How does Aetrix verify that SMCJ78CHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ78CHE3/57T 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 SMCJ78CHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ78CHE3/57T?
All SMCJ78CHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78CHE3/57T, 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 SMCJ78CHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ78CHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ78CHE3/57T Tags
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