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Vishay General Semiconductor - Diodes Division SMBJ78CHE3/5B
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- Part No.:
- SMBJ78CHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CHE3/5B.pdf
- Description:
- TVS DIODE 78VWM 139VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,899
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Product details
Overview
SMBJ78CHE3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) 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 voltage (VBR) at 1 mA, 126 V maximum clamping voltage (VC) at 4.8 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives and automotive body control modules.
For engineers reviewing the SMBJ78CHE3/5B datasheet, SMBJ78CHE3/5B pinout, SMBJ78CHE3/5B application, or SMBJ78CHE3/5B equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (−55 to +150 °C), and RoHS-compliant packaging details essential for ESD/surge protection design-in and BOM validation.
Technical Context
This unidirectional TVS operates as a clamping device: under normal bias it presents high impedance (>1 µA leakage at 78 V), but triggers avalanche conduction when transient voltage exceeds VBR, limiting downstream voltage to ≤126 V at 4.8 A. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Designed for automated SMT assembly, SMBJ78CHE3/5B meets J-STD-020 MSL Level 1 (peak reflow 260 °C), supports 100 A non-repetitive forward surge (8.3 ms half-sine), and delivers fast response time (<1 ns) - critical for protecting MOSFET gates and microcontroller I/O against inductive switching transients and lightning-induced surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets upper limit for protected circuit DC rail. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Confirmed breakdown threshold range; defines minimum overvoltage level that initiates clamping action. |
| VC @ IPPM | 126 V at 4.8 A - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream ICs during transient events. |
| PPPM | 600 W - Peak pulse power handling capability; enables protection against high-energy transients per ISO 7637-2 Pulse 1/2/5a. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs derating requirements above 25 °C ambient. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop when cathode is tied to protected line. |
| Cathode | High-side connection point | Connected to protected line (e.g., 78 V supply rail); conducts avalanche current to anode during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against high-energy transients without external series impedance or staged clamping. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power supplies where long-term reliability is mandatory. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage drift over temperature and lifetime, critical for precision voltage clamping. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow without popcorn cracking or delamination, eliminating special handling in high-volume SMT lines. |
| RoHS-compliant & halogen-free option available | Meets EU RoHS Directive 2011/65/EU and JEDEC JS709E material restrictions for environmentally regulated end equipment. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protects 24 V CAN/LIN bus interface circuits from load dump and inductive kickback during relay switching. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between LIN transceiver VCC pin and chassis ground. Use Value: Limits transient voltage to ≤126 V, preventing latch-up or permanent damage to transceivers rated for 36 V absolute maximum. |
Use Scenario: Shields 24 V digital input optocoupler front-end from field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input terminals to shunt surge energy before reaching current-limiting resistor and opto-LED. Use Value: Maintains <1 µA leakage at 24 V nominal, ensuring no false triggering while clamping 1 kV/1 A transients per IEC 61000-4-5. |
| Telecom Power Supply DC Output | Consumer Appliance Motor Driver Board |
|
Use Scenario: Safeguards 48 V PoE-powered Ethernet switch DC-DC converter output against hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side 48 V rail, upstream of point-of-load regulators. Use Value: Delivers 600 W pulse handling with <1 ns response, suppressing >100 V spikes before regulation loop can react. |
Use Scenario: Guards BLDC motor gate driver ICs from back-EMF spikes generated during PWM commutation in washing machine inverters. IC Role / Device Role / Timing Role: Localized TVS mounted directly at half-bridge high-side FET source node to clamp shoot-through transients. Use Value: Withstands 100 A 8.3 ms surge (IFSM), surviving repeated motor stall conditions without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78A-E3/5B | No AEC-Q101 qualification; commercial-grade only; identical electrical specs and SMB package. | Suitable for non-automotive industrial or consumer use where automotive reliability testing is not required. | Select SMBJ78A-E3/5B for cost-sensitive non-automotive designs with same clamping performance. |
| SMCJ78AHE3_A/H | Larger SMC (DO-214AB) package; higher 1500 W PPPM; same VWM/VC but 10.5 A IPPM. | Better suited for higher-energy transients (e.g., 4 kV EFT, ISO 7637-2 Pulse 5b) requiring greater surge margin. | Choose SMCJ78AHE3_A/H when PCB layout allows larger footprint and system-level surge tests exceed 600 W capability. |
Compared with SMBJ78A-E3/5B, SMBJ78CHE3/5B adds AEC-Q101 qualification for automotive deployment without changing clamping behavior; versus SMCJ78AHE3_A/H, it trades 2.5× pulse power for 30 % smaller PCB area and lower thermal mass - enabling compact, thermally constrained layouts.
Availability
SMBJ78CHE3/5B is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, telecom power supplies, and consumer appliance motor control systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ78CHE3/5B 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 application-specific optimization.
The SMBJ series targets board-level transient protection in space-constrained, high-reliability applications - engineered for fast clamping, low leakage, and compatibility with automated manufacturing and harsh environmental conditions.
FAQ
What is the clamping voltage of SMBJ78CHE3/5B at its rated peak pulse current?
The SMBJ78CHE3/5B has a maximum clamping voltage (VC) of 126 V at 4.8 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ78CHE3/5B maintains this clamping performance across its full operating temperature range of −55 to +150 °C.
Is SMBJ78CHE3/5B qualified for automotive applications?
Yes, SMBJ78CHE3/5B is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet 88392 (Revision 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, making SMBJ78CHE3/5B suitable for under-hood and cabin electronics such as body control modules and infotainment power rails.
What is the standoff voltage rating for SMBJ78CHE3/5B?
The standoff voltage (VWM) for SMBJ78CHE3/5B is 78 V - the maximum DC or continuous reverse working voltage the device can withstand without exceeding 1 µA leakage current. This rating ensures reliable blocking during normal operation while allowing rapid transition to avalanche conduction when transients exceed the breakdown threshold of 86.7–95.8 V.
Does SMBJ78CHE3/5B have a bidirectional variant?
No, SMBJ78CHE3/5B is strictly unidirectional, indicated by the "A" suffix and cathode band marking. For bidirectional operation at the same voltage level, the equivalent part is SMBJ78CAHE3/5B (with "CA" suffix), which provides symmetrical clamping in both directions and no polarity marking. Both share identical package, thermal specs, and AEC-Q101 qualification but differ in conduction behavior and circuit placement.
What is the thermal resistance of SMBJ78CHE3/5B, and how does it affect layout?
SMBJ78CHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB with no internal planes; designers must increase copper area or add thermal vias if ambient temperatures exceed 25 °C or power dissipation approaches 5.0 W to avoid exceeding the +150 °C maximum junction temperature.
SMBJ78CHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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):
- 4.3A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SMBJ78CHE3/5B FAQ
1.How can I place an order for SMBJ78CHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CHE3/5B 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 SMBJ78CHE3/5B reliable?
The price and inventory of SMBJ78CHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78CHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ78CHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CHE3/5B?
SMBJ78CHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CHE3/5B 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 SMBJ78CHE3/5B?
For technical support, including SMBJ78CHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CHE3/5B requirements.
6.How does Aetrix verify that SMBJ78CHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ78CHE3/5B 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 SMBJ78CHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ78CHE3/5B?
All SMBJ78CHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CHE3/5B, 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 SMBJ78CHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ78CHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CHE3/5B Tags
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