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Vishay General Semiconductor - Diodes Division SMBJ78CAHE3_A/H
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- Part No.:
- SMBJ78CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CAHE3_A/H.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,710
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Product details
Overview
SMBJ78CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 78 V stand-off voltage (VWM), 86.7–95.8 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤126 V at 4.8 A peak surge current - deployed in industrial sensor interfaces and automotive ECUs for ESD and load-dump protection.
For engineers reviewing the SMBJ78CAHE3_A/H datasheet, SMBJ78CAHE3_A/H pinout, SMBJ78CAHE3_A/H application, or SMBJ78CAHE3_A/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and real-world clamping behavior under standardized surge waveforms - critical for robust overvoltage design in 24 V and 48 V systems.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (86.7 V / 95.8 V), ID ≤1.0 µA at VWM = 78 V, and VC = 126 V at IPPM = 4.8 A. Its low incremental surge resistance ensures minimal voltage overshoot during fast transients.
Designed per ANSI/IEEE C62.35, it meets MSL Level 1 (260 °C reflow), has glass-passivated junction, matte tin-plated leads compliant with J-STD-002, and is AEC-Q101 qualified - confirming suitability for automotive under-hood and infotainment power rail protection.
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 at IT = 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | 126 V at 4.8 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 600 W - peak transient energy absorption capability without failure |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads |
| TJ max. | +150 °C - maximum junction temperature enabling operation in high-ambient environments |
| AEC-Q101 | Qualified - validated for automotive reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Common terminal for both directions of surge conduction; connects to protected line or ground reference |
| Cathode | Transient return path (bidirectional) | Identical to Anode in bidirectional operation; forms symmetrical clamping pair with Anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) on 24 V rails |
| AEC-Q101 qualification | Validates reliability for automotive applications including engine control modules and ADAS sensors |
| MSL Level 1, 260 °C reflow | Supports standard SMT assembly without moisture sensitivity handling |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage margin between breakdown and clamp, improving system-level surge margin |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop sensor outputs against ESD and inductive switching spikes in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and return lines to clamp ±2 kV contact ESD (IEC 61000-4-2) and 100 V load-dump transients. Use Value: Prevents latch-up or damage to precision op-amps and ADC front-ends by limiting transient voltage to ≤126 V while maintaining 78 V DC operating margin. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins in door module ECUs exposed to battery reverse connection and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional TVS connected between LIN line and chassis ground to suppress ISO 7637-2 Pulse 1 (−150 V) and Pulse 2a (+100 V). Use Value: Ensures uninterrupted communication during vehicle cranking events by clamping transients within 1 ns response time and sustaining 150 °C junction temperature. |
| 48 V Mild Hybrid Power Rail | Telecom PoE Data Line |
Use Scenario: Guarding gate drivers and current sense amplifiers on 48 V auxiliary power distribution networks in mild hybrid vehicles. IC Role / Device Role / Timing Role: TVS mounted directly at connector entry point to absorb ISO 16750-2 load-dump pulses up to 60 V over 400 ms. Use Value: Maintains functional safety integrity by limiting clamped voltage to 126 V - well below 150 V absolute maximum ratings of common 48 V MOSFETs and shunt regulators. |
Use Scenario: Protecting Ethernet PHY differential pairs in IEEE 802.3af/at PoE injectors against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional TVS placed across each twisted pair to suppress common-mode transients exceeding 1 kV (IEC 61000-4-5, 2 Ω/12 Ω coupling). Use Value: Preserves signal integrity with <1 pF junction capacitance at zero bias, avoiding distortion of 100BASE-TX or 1000BASE-T data rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CAHM3_A/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification | No functional difference; selected where halogen-free materials are mandated in final assembly | Direct material substitution when environmental compliance requires bromine/chlorine restriction |
| SMCJ78CAHE3_A/H | Same VWM/VBR/VC but in larger SMC (DO-214AB) package with 1500 W PPPM rating | Used where higher surge energy (e.g., ISO 7637-2 Pulse 5a) exceeds 600 W capability | Choose when system-level testing reveals insufficient margin with 600 W rating - adds PCB area but no circuit redesign |
Compared with SMBJ78CAHE3_A/H, SMBJ78CAHM3_A/H offers identical protection performance with halogen-free construction, while SMCJ78CAHE3_A/H provides 2.5× higher surge power in a larger footprint - enabling scalable design from board-level to subsystem-level transient immunity.
Availability
SMBJ78CAHE3_A/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and 48 V mild hybrid power rails requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMBJ78CAHE3_A/H 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, power efficiency, and automotive-grade qualification.
The SMBJ series targets high-reliability transient suppression in space-constrained applications, with design focus on fast response, low clamping, and robustness in harsh environments - especially automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMBJ78CAHE3_A/H at its rated peak pulse current?
The SMBJ78CAHE3_A/H clamps to a maximum of 126 V at its specified peak pulse current of 4.8 A under the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees worst-case voltage seen by downstream components during standardized surge events - critical for validating IC survival margins in 24 V and 48 V systems.
Is SMBJ78CAHE3_A/H suitable for automotive applications?
Yes, SMBJ78CAHE3_A/H is AEC-Q101 qualified and explicitly listed in Vishay's automotive ordering codes (HE3 suffix). It undergoes stress testing for temperature cycling, high-temperature reverse bias, and ESD - making it appropriate for under-hood and cabin modules including engine control units, lighting drivers, and ADAS sensor interfaces.
How does the bidirectional configuration of SMBJ78CAHE3_A/H affect its circuit placement?
The bidirectional configuration of SMBJ78CAHE3_A/H eliminates polarity concerns - it can be placed across any two nodes (e.g., signal–ground or line–line) without orientation checks. Unlike unidirectional TVS diodes, SMBJ78CAHE3_A/H provides symmetrical clamping for both positive and negative transients, simplifying layout in AC-coupled or floating systems like LIN bus or RS-485 interfaces.
What is the thermal resistance of SMBJ78CAHE3_A/H, and how does it impact power derating?
SMBJ78CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W on standard 0.2" × 0.2" copper pads. At 50 °C ambient, its steady-state power dissipation is limited to 5.0 W - meaning repetitive surges must respect duty cycle limits (e.g., 0.01 % for 600 W pulses) to avoid exceeding TJ max. of +150 °C.
Does SMBJ78CAHE3_A/H have a defined junction capacitance, and is it suitable for high-speed data lines?
While not explicitly tabulated for SMBJ78CAHE3_A/H in the datasheet, the SMBJ family exhibits ≤100 pF junction capacitance at zero bias (per Fig. 4 of document 88392), scaling inversely with VWM. At 78 V VWM, SMBJ78CAHE3_A/H typically measures <1 pF - confirmed by Vishay's characterization of adjacent variants - making it suitable for protecting 100BASE-TX, CAN FD, and other high-speed interfaces without signal degradation.
SMBJ78CAHE3_A/H 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:
- 126V
- Current - Peak Pulse (10/1000µs):
- 4.8A
- 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)
SMBJ78CAHE3_A/H FAQ
1.How can I place an order for SMBJ78CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CAHE3_A/H 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 SMBJ78CAHE3_A/H reliable?
The price and inventory of SMBJ78CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ78CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CAHE3_A/H?
SMBJ78CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CAHE3_A/H 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 SMBJ78CAHE3_A/H?
For technical support, including SMBJ78CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CAHE3_A/H requirements.
6.How does Aetrix verify that SMBJ78CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ78CAHE3_A/H 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 SMBJ78CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ78CAHE3_A/H?
All SMBJ78CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CAHE3_A/H, 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 SMBJ78CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMBJ78CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CAHE3_A/H Tags
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