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Vishay General Semiconductor - Diodes Division SMBJ78CAHE3_B/H
- Part No.:
- SMBJ78CAHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CAHE3_B/H.pdf
- Description:
- 600W,78V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,808
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Product details
Overview
SMBJ78CAHE3_B/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 78 V stand-off voltage (VWM), 86.7–95.8 V breakdown range (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 on power rails and signal lines in industrial sensor interfaces.
For engineers reviewing the SMBJ78CAHE3_B/H datasheet, SMBJ78CAHE3_B/H pinout, SMBJ78CAHE3_B/H application, or SMBJ78CAHE3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), low leakage (<1.0 µA at VWM), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping performance regardless of voltage polarity - critical for protecting AC-coupled or floating signal paths. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance under repetitive transients.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow peak, supporting high-reliability automotive and industrial deployments. Its 100 °C/W junction-to-ambient thermal resistance assumes mounting on 0.2" × 0.2" copper pads per datasheet test condition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 126 V at 4.8 A - Clamped voltage seen by protected circuit during 600 W transient, limiting stress on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform, enabling suppression of common lightning and ESD-induced surges. |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance nodes. |
| TJ max | +150 °C - Enables operation in under-hood automotive or enclosed industrial enclosures without derating. |
| RθJA | 100 °C/W - Thermal resistance baseline for thermal design using recommended 5.0 mm × 5.0 mm copper pads per terminal. |
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 current entry (negative polarity) | Accepts surge current during negative-going transients; electrically identical to cathode in bidirectional operation. |
| Cathode | Transient current entry (positive polarity) | Accepts surge current during positive-going transients; functionally interchangeable with anode due to symmetry. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per stress test plan. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV) surge events when properly laid out with low-inductance traces and grounding. |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term parameter stability under thermal and humidity stress. |
| MSL Level 1 | Zero floor life limitation; supports unlimited storage and standard reflow profiles up to 260 °C peak. |
| RoHS-compliant & halogen-free option | HE3 suffix denotes RoHS compliance; HM3 variant adds halogen-free molding compound for stringent environmental programs. |
Applications
| Industrial Sensor Interface Protection | Automotive CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting 24 V analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching spikes in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, absorbing energy before it reaches ADC input or signal conditioner. Use Value: Limits transient voltage to ≤126 V while maintaining <1.0 µA leakage at 78 V nominal rail, preserving measurement accuracy and preventing latch-up. |
Use Scenario: Safeguarding CAN_H/CAN_L differential pair against ISO 7637-2 pulse 1, 2a, and 5a transients in body control modules. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS connected line-to-line and line-to-ground to clamp common-mode and differential surges simultaneously. Use Value: Delivers 126 V clamping at 4.8 A with sub-1 ns response, meeting ISO 16750-2 requirements without distorting 1 Mbps CAN signaling. |
| AC/DC Power Supply Input Stage | Telecom Line Card Surge Protection |
|
Use Scenario: Secondary-side overvoltage protection on 72–90 V DC intermediate bus in DIN-rail mounted power supplies. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across output capacitor to clamp sustained overvoltage from regulator failure or feedback loop loss. Use Value: Withstands 78 V continuous operation and clamps to 126 V during fault, allowing time for upstream OVP circuitry to react without catastrophic failure. |
Use Scenario: Primary protection for Ethernet PHY interface and auxiliary power lines in outdoor telecom base station line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: First-stage TVS on 48 V bias rails and data lines, coordinated with GDTs and PTCs in multi-stage protection architecture. Use Value: 600 W rating and 100 °C/W thermal resistance enable reliable operation under repeated 10/1000 µs surges per ITU-T K.20/21 standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CAHM3_B/H | Halogen-free molding compound; otherwise identical electrical and thermal specs. | Required where halogen-free compliance is mandated (e.g., EU public infrastructure projects). | Select when environmental compliance exceeds standard RoHS requirements. |
| SMCJ78CAHE3_A/H | Larger SMC (DO-214AB) package; 1500 W PPPM; higher VC (135 V); same VWM/VBR. | Better suited for higher-energy threats (e.g., direct lightning coupling) but requires larger PCB area. | Choose only if 600 W is insufficient and layout allows SMC footprint. |
Compared with SMBJ78CAHE3_B/H, the HM3 variant adds halogen-free compliance without trade-offs, while the SMCJ78CAHE3_A/H offers higher surge capacity at the cost of size and clamping voltage - making SMBJ78CAHE3_B/H optimal for space-constrained 600 W protection needs.
Availability
SMBJ78CAHE3_B/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive CAN bus protection, AC/DC power supply input stages, and telecom line card surge protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMBJ78CAHE3_B/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series delivers standardized, high-power TVS protection in compact SMB packages for automotive, industrial, and telecom applications - engineered for fast response, stable clamping, and seamless SMT integration.
FAQ
What does the "CA" suffix indicate in SMBJ78CAHE3_B/H?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ78CAHE3_B/H provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBJ78A), it has no polarity marking and functions identically across either polarity, making it ideal for AC signal lines, differential buses like CAN, or floating power domains where voltage reversal may occur.
Is SMBJ78CAHE3_B/H qualified for automotive use?
Yes, SMBJ78CAHE3_B/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure ("HE3" denotes RoHS-compliant + AEC-Q101 qualification). This certification covers stress tests including high-temperature reverse bias, temperature cycling, and surge endurance - validating its suitability for under-hood and chassis-mounted automotive electronics where reliability under thermal and electrical stress is critical.
What is the maximum clamping voltage of SMBJ78CAHE3_B/H and at what current is it specified?
The maximum clamping voltage (VC) of SMBJ78CAHE3_B/H is 126 V, measured at a peak pulse current (IPPM) of 4.8 A with a 10/1000 µs waveform. This value represents the worst-case voltage imposed on the protected circuit during a standardized surge event, directly informing system-level overvoltage margin calculations and downstream IC survivability analysis.
How does the thermal resistance of SMBJ78CAHE3_B/H affect PCB layout?
SMBJ78CAHE3_B/H has a typical RθJA of 100 °C/W, measured with 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain junction temperature within the 150 °C limit during repetitive surges, PCB layout must replicate this pad area and ensure adequate copper pour and via stitching to inner ground planes - undersized pads will cause excessive thermal rise and premature degradation.
Can SMBJ78CAHE3_B/H replace a unidirectional SMBJ78A in an existing design?
No - SMBJ78CAHE3_B/H cannot directly replace SMBJ78A without circuit review. While both share VWM = 78 V and similar clamping, SMBJ78A is unidirectional (cathode-banded) and conducts forward current during positive transients only, whereas SMBJ78CAHE3_B/H clamps in both directions. Substitution may cause unintended conduction in DC-biased circuits or alter protection behavior in single-polarity rails.
SMBJ78CAHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ78CAHE3_B/H FAQ
1.How can I place an order for SMBJ78CAHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CAHE3_B/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_B/H reliable?
The price and inventory of SMBJ78CAHE3_B/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_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ78CAHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CAHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CAHE3_B/H?
SMBJ78CAHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CAHE3_B/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_B/H?
For technical support, including SMBJ78CAHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CAHE3_B/H requirements.
6.How does Aetrix verify that SMBJ78CAHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ78CAHE3_B/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_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ78CAHE3_B/H?
All SMBJ78CAHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CAHE3_B/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_B/H part is unused and in its original packaging.
Return procedure for SMBJ78CAHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CAHE3_B/H Tags
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