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Vishay General Semiconductor - Diodes Division SMBJ78HE3/5B
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- Part No.:
- SMBJ78HE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78HE3/5B.pdf
- Description:
- TVS DIODE 78VWM 139VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,389
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Product details
Overview
SMBJ78HE3/5B 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, automotive ECUs, and telecom power supplies.
For engineers reviewing the SMBJ78HE3/5B datasheet, SMBJ78HE3/5B pinout, SMBJ78HE3/5B application, or SMBJ78HE3/5B equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (–55 to +150 °C), and packaging configuration (13" tape & reel, 3200 pcs) - all critical for ESD/surge protection design-in and BOM validation.
Technical Context
The SMBJ78HE3/5B operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its VBR threshold (min 86.7 V, max 95.8 V at 1 mA), with fast response time (<1 ps) and low incremental surge resistance enabling effective suppression of transient spikes from inductive switching or lightning-induced surges. Its glass-passivated junction ensures stable leakage performance and long-term reliability under repetitive stress.
Designed for PCB-level protection, it mounts on 0.2" × 0.2" copper pads per specification, delivering 126 V clamping at 4.8 A IPPM while maintaining <1.0 µA reverse leakage at 78 V. The device meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive-grade deployment - confirmed by HE3 suffix and Vishay's official documentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 72–80 V systems. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Breakdown voltage range confirming reliable turn-on threshold across process variation. |
| VC @ IPPM | 126 V at 4.8 A - Clamping voltage under 10/1000 µs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 600 W - Peak pulse power handling capability; supports high-energy transients without failure in industrial environments. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inrush or fault currents. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial enclosures. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; informs heatsinking requirements for sustained power dissipation. |
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; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground during overvoltage events. |
| Anode (unbanded end) | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping path. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test standard - enables use in engine control units and ADAS power domains. |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy transients common in 24 V/48 V vehicle power nets and industrial PLC I/O modules. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 µA at VWM) over temperature and lifetime. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT assembly processes without moisture sensitivity concerns. |
| Unidirectional polarity | Provides asymmetric clamping ideal for DC-biased signal lines and positive-rail power protection. |
Applications
| Automotive Engine Control Unit (ECU) Power Input | Industrial PLC Digital I/O Protection |
|---|---|
|
Use Scenario: Protects 12 V/24 V supply input of engine control modules from load-dump spikes (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Primary TVS clamp placed upstream of DC-DC converter input to limit voltage excursion below IC absolute maximum ratings. Use Value: Clamps to ≤126 V during 4.8 A surge, preventing damage to downstream regulators and microcontrollers rated for 36 V max input. |
Use Scenario: Shields 24 V digital input channels of programmable logic controllers from field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminal and ground to shunt transient energy before reaching optocoupler or buffer IC. Use Value: Sub-1 ns response ensures clamping occurs before sensitive interface ICs experience overstress, preserving signal integrity and longevity. |
| Telecom Base Station DC Power Distribution | Consumer Appliance Motor Drive Board |
|
Use Scenario: Safeguards 48 V backplane power rails in cellular base station cabinets against lightning-induced surges entering via external cabling. IC Role / Device Role / Timing Role: Secondary-level TVS used in conjunction with GDTs and MOVs to provide fine-clamping stage in multi-stage protection architecture. Use Value: 600 W rating and 126 V clamping enable coordination with upstream coarse protectors while limiting let-through energy to <100 mJ. |
Use Scenario: Protects H-bridge gate driver supply rails in washing machine or HVAC blower motor controllers from inductive kickback during PWM switching. IC Role / Device Role / Timing Role: Unidirectional TVS connected across VDD and ground of half-bridge drivers to suppress voltage overshoot during MOSFET turn-off. Use Value: 78 V VWM allows safe operation with 60 V nominal bus, while 126 V VC prevents driver latch-up during 100 V transients. |
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 | Commercial-grade (non-AEC-Q101), same VWM/VBR/VC, identical SMB package and pinout. | Lacks automotive qualification; suitable for industrial/commercial power supplies where AEC-Q101 is not mandated. | Select SMBJ78A-E3/5B for cost-sensitive non-automotive designs requiring identical electrical specs but no automotive reliability validation. |
| SMCJ78A | Higher power rating (1500 W), larger SMC (DO-214AB) package, same VWM and VBR range. | Used where higher surge energy absorption is required (e.g., outdoor telecom equipment), but requires PCB layout change. | Choose SMCJ78A only if system-level surge testing exceeds 600 W; otherwise, SMBJ78HE3/5B offers optimal size-power balance for space-constrained boards. |
Compared with SMBJ78A-E3/5B, SMBJ78HE3/5B adds AEC-Q101 qualification for automotive use without altering electrical behavior; versus SMCJ78A, it trades 2.5× peak power for 40% smaller footprint - making SMBJ78HE3/5B the preferred choice for AEC-compliant, space-limited 24–48 V DC protection.
Availability
SMBJ78HE3/5B is available at Aetrix Electronics and suitable for automotive ECU power inputs, industrial PLC I/O modules, telecom 48 V distribution, and consumer appliance motor drive boards requiring stable component supply and AEC-Q101 compliance.
Supply support for SMBJ78HE3/5B 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, lightning, and inductive switching is mission-critical.
FAQ
What is the clamping voltage of SMBJ78HE3/5B at its rated peak pulse current?
The SMBJ78HE3/5B has a maximum clamping voltage (VC) of 126 V at its specified peak pulse current (IPPM) of 4.8 A, measured using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuits during surge events. The SMBJ78HE3/5B maintains this clamping performance consistently due to its glass-passivated junction and controlled avalanche characteristics.
Is SMBJ78HE3/5B qualified for automotive applications?
Yes, SMBJ78HE3/5B is explicitly AEC-Q101 qualified, as confirmed by the "HE3" suffix and Vishay's official documentation (Document Number: 88392, Revision: 09-Jan-2024). This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - validating its suitability for under-hood and chassis-mounted automotive electronics. The SMBJ78HE3/5B is commonly deployed in engine control units, body control modules, and ADAS power domains.
What does the "5B" in SMBJ78HE3/5B indicate?
The "5B" in SMBJ78HE3/5B denotes the preferred package code specifying 13-inch diameter plastic tape-and-reel delivery with a base quantity of 3200 pieces. This packaging format is optimized for high-volume automated SMT placement and aligns with IPC-7351 standards for SMB (DO-214AA) devices. The "HE3" portion confirms RoHS-compliance and AEC-Q101 qualification, while "5B" ensures consistent reel logistics and feeder compatibility in manufacturing lines handling SMBJ78HE3/5B.
How does SMBJ78HE3/5B differ from bidirectional TVS diodes like SMBJ78CA?
The SMBJ78HE3/5B is unidirectional, meaning it conducts only in reverse bias above its breakdown voltage and blocks forward current like a standard diode - ideal for protecting positively biased DC rails. In contrast, SMBJ78CA is bidirectional and symmetrical, conducting in both directions, making it suitable for AC lines or differential signal pairs. The SMBJ78HE3/5B includes a cathode band marking; SMBJ78CA has no polarity marking. Their VWM and VC values differ accordingly - SMBJ78HE3/5B uses 78 V VWM, while SMBJ78CA specifies 78 V as peak reverse voltage in either direction.
What is the maximum reverse leakage current of SMBJ78HE3/5B at its stand-off voltage?
The SMBJ78HE3/5B exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated stand-off voltage (VWM) of 78 V and ambient temperature of 25 °C. This low leakage ensures minimal power loss and thermal impact in always-on protection circuits, supporting long-term reliability in battery-backed or energy-sensitive systems. Leakage remains within specification up to +125 °C, with typical values well below 0.5 µA at room temperature - verified per Vishay's Electrical Characteristics table on page 2 of document 88392.
SMBJ78HE3/5B 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ78HE3/5B FAQ
1.How can I place an order for SMBJ78HE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78HE3/5B 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 SMBJ78HE3/5B reliable?
The price and inventory of SMBJ78HE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78HE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ78HE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78HE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78HE3/5B?
SMBJ78HE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78HE3/5B 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 SMBJ78HE3/5B?
For technical support, including SMBJ78HE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78HE3/5B requirements.
6.How does Aetrix verify that SMBJ78HE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ78HE3/5B 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 SMBJ78HE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ78HE3/5B?
All SMBJ78HE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78HE3/5B, 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 SMBJ78HE3/5B part is unused and in its original packaging.
Return procedure for SMBJ78HE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78HE3/5B Tags
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