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Vishay General Semiconductor - Diodes Division SMBJ78CAHE3/5B
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- Part No.:
- SMBJ78CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CAHE3/5B.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,702
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Product details
Overview
SMBJ78CAHE3/5B 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, 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 sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ78CAHE3/5B datasheet, SMBJ78CAHE3/5B pinout, SMBJ78CAHE3/5B application, or SMBJ78CAHE3/5B 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 RoHS-compliant matte tin-plated terminals suitable for automated SMT placement.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping performance in forward and reverse directions. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMB package supports high surge current handling without thermal runaway under repetitive 0.01% duty cycle conditions.
The device meets MSL Level 1 per J-STD-020 with peak reflow temperature of 260 °C and is qualified to AEC-Q101 for automotive-grade reliability. Its 150 °C maximum junction temperature and 100 A IFSM rating (unidirectional only; not applicable here) reflect robust transient energy absorption within compact PCB footprints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 72–84 V nominal systems. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 126 V at 4.8 A - Clamped voltage seen by protected circuit during full 600 W transient; limits downstream stress to ≤126 V. |
| PPPM | 600 W - Peak pulse power dissipation with 10/1000 µs waveform; enables protection against lightning-induced surges and inductive switching spikes. |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage ensures minimal standby power loss and no interference with high-impedance sensor or communication lines. |
| TJ max. | +150 °C - Maximum junction temperature supporting operation in under-hood automotive or industrial enclosures without derating. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for sustained surge duty. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (bidirectional) | Accepts surge current in either polarity; connects to line being protected (e.g., RS-485 A/B, DC bus). |
| Cathode | Transient current exit point (bidirectional) | Completes clamping path to ground or return rail; symmetric role with Anode due to bidirectional construction. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) on 24–48 V industrial buses. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive powertrain and body electronics where reliability under thermal cycling and vibration is mandatory. |
| MSL Level 1, 260 °C peak reflow | Supports lead-free reflow soldering without moisture sensitivity concerns or pre-bake requirements. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter stability across temperature and lifetime. |
| Bidirectional symmetry | Eliminates need for polarity-aware layout; simplifies design for AC-coupled or differential signal lines like CAN, RS-485, or Ethernet PHYs. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting analog output (4–20 mA) and digital I/O (RS-485) circuits in PLC modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground to shunt ESD and inductive kickback. Use Value: Limits transient voltage to ≤126 V, preventing damage to precision DACs, isolators, and RS-485 transceivers operating at ±12 V supply rails. |
Use Scenario: Safeguarding Ethernet PHY and PoE controller inputs in network switches subjected to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to chassis ground, suppressing differential and common-mode transients. Use Value: Maintains signal integrity below 126 V clamping threshold while adding <1 pF junction capacitance, avoiding data rate degradation at 100 Mbps. |
| Automotive Body Control Module | DC Power Rail Protection |
|
Use Scenario: Securing LIN bus and switch input lines in door modules against battery dump and load dump transients. IC Role / Device Role / Timing Role: Bidirectional clamp on LIN data line and wake-up input, referenced to vehicle ground. Use Value: Withstands ISO 7637-2 Pulse 1 (−150 V) and Pulse 2a (+100 V) without failure, meeting AEC-Q101 stress test requirements. |
Use Scenario: Guarding 24 V DC input rails in railway signaling equipment against coupling from adjacent high-current circuits. IC Role / Device Role / Timing Role: Parallel-connected TVS between rail and ground to clamp surges exceeding 78 V stand-off level. Use Value: Absorbs 600 W pulses without thermal runaway, enabling compliance with EN 50121-3-2 rail EMC immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CA-M3/5B | Same electrical specs; halogen-free, RoHS-compliant, non-AEC-Q101 rated. | Preferred for commercial/industrial designs where automotive qualification is unnecessary. | Select when cost optimization and halogen-free compliance are prioritized over automotive qualification. |
| SMCJ78CAHE3/5B | Same VWM/VC, but in larger SMC (DO-214AB) package with 1500 W PPPM. | Used where higher surge margin or legacy board layouts require SMC footprint. | Choose when system-level surge testing exceeds 600 W or existing PCB has SMC pad layout. |
Compared with SMBJ78CAHE3/5B, the M3/5B variant offers identical protection performance without AEC-Q101 validation, while the SMCJ78CAHE3/5B delivers 2.5× higher pulse power in a larger package - enabling trade-offs between board space, qualification scope, and surge margin.
Availability
SMBJ78CAHE3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and DC power rail protection requiring stable component supply across multi-year production cycles.
Supply support for SMBJ78CAHE3/5B 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 and application-specific performance.
The SMBJ series targets surface-mount transient suppression in space-constrained, high-reliability applications - engineered for rapid response, low clamping, and compatibility with automated manufacturing processes.
FAQ
What does the "CA" suffix indicate in SMBJ78CAHE3/5B?
The "CA" suffix denotes a bidirectional configuration, meaning SMBJ78CAHE3/5B provides symmetrical transient suppression in both polarities - essential for protecting AC-coupled or differential signal lines such as RS-485, CAN, or Ethernet without polarity concerns. This differs from unidirectional "A" variants that require correct cathode orientation.
Is SMBJ78CAHE3/5B suitable for automotive applications?
Yes - the "HE3" suffix confirms SMBJ78CAHE3/5B is AEC-Q101 qualified, validated for automotive environments including under-hood and body electronics. It meets stress tests for temperature cycling, mechanical shock, and humidity, making it appropriate for LIN bus, lighting control, and sensor interface modules in production vehicles.
What is the maximum clamping voltage of SMBJ78CAHE3/5B and how is it measured?
The maximum clamping voltage (VC) of SMBJ78CAHE3/5B is 126 V, measured at 4.8 A peak pulse current using the standardized 10/1000 µs double-exponential waveform. This value represents the highest voltage imposed on the protected circuit during worst-case transient events, directly limiting stress on downstream ICs and passive components.
How does the SMB (DO-214AA) package of SMBJ78CAHE3/5B compare to SMC (DO-214AB) in thermal performance?
SMBJ78CAHE3/5B in SMB package has RθJA = 100 °C/W, while SMC-packaged equivalents like SMCJ78CAHE3/5B achieve ~60 °C/W due to larger copper pad area and thermal mass. For SMBJ78CAHE3/5B, this means higher junction temperature rise per watt - requiring careful layout with minimum 0.2" × 0.2" copper pads per terminal to maintain reliability under repeated surges.
Does SMBJ78CAHE3/5B have polarity markings on the device body?
No - SMBJ78CAHE3/5B is a bidirectional TVS and carries no polarity marking (e.g., cathode band) on its SMB package. Its symmetrical construction allows installation in either orientation, simplifying PCB layout and eliminating risk of reverse placement errors common with unidirectional variants like SMBJ78AHE3/5B.
SMBJ78CAHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMBJ78CAHE3/5B FAQ
1.How can I place an order for SMBJ78CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CAHE3/5B 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 SMBJ78CAHE3/5B reliable?
The price and inventory of SMBJ78CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ78CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CAHE3/5B?
SMBJ78CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CAHE3/5B 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 SMBJ78CAHE3/5B?
For technical support, including SMBJ78CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CAHE3/5B requirements.
6.How does Aetrix verify that SMBJ78CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ78CAHE3/5B 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 SMBJ78CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ78CAHE3/5B?
All SMBJ78CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CAHE3/5B, 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 SMBJ78CAHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ78CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CAHE3/5B Tags
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