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Vishay General Semiconductor - Diodes Division SMBJ78CA-E3/5B
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- Part No.:
- SMBJ78CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CA-E3/5B.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,299
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Product details
Overview
SMBJ78CA-E3/5B 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 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 on power rails and signal lines in industrial motor drives.
For engineers reviewing the SMBJ78CA-E3/5B datasheet, SMBJ78CA-E3/5B pinout, SMBJ78CA-E3/5B application, or SMBJ78CA-E3/5B equivalent, key selection criteria include bidirectional clamping behavior, low clamping ratio (VC/VWM = 1.61), MSL Level 1 moisture sensitivity, and compatibility with automated SMT assembly on PCBs requiring IEC 61000-4-5 surge immunity.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping performance regardless of transient polarity. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent energy absorption during repetitive 10/1000 µs surges at 0.01% duty cycle.
The device exhibits a temperature coefficient of VBR of +0.106 %/°C and a typical thermal resistance of 100 °C/W (junction-to-ambient) on standard 5.0 mm × 5.0 mm copper pads. It supports operating junction temperatures from –55 °C to +150 °C and meets UL 497B recognition (QVGQ2) for protector classification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transients without premature leakage. |
| VC @ IPPM | 126 V at 4.8 A - Clamped voltage under 600 W 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 600 W - Peak pulse power handling capability; validates suitability for IEC 61000-4-5 Level 4 (4 kV) surge events. |
| IPPM | 4.8 A - Peak pulse current corresponding to VC; used to size series impedance for coordinated protection. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in high-ambient environments like motor control enclosures. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with J-STD-020 MSL Level 1 reflow. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional terminal pair | No functional distinction - either terminal serves as anode or cathode depending on transient polarity; enables single-device protection of AC or floating DC lines. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions - eliminates need for dual unidirectional devices on differential or AC-coupled interfaces. |
| 600 W peak pulse power | Validated with 10/1000 µs waveform - meets IEC 61000-4-5 surge immunity requirements for industrial equipment up to Level 4. |
| Low clamping ratio | VC/VWM = 1.61 - minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage in MOSFET drivers. |
| MSL Level 1 rating | Maximum reflow peak of 260 °C - supports standard lead-free SMT processes without baking or special handling. |
| UL 497B recognition | QVGQ2 file E136766 - certifies compliance for use in telecom and industrial surge protection modules requiring safety agency approval. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate driver ICs and microcontrollers against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Bidirectional TVS placed across VDD-GND and signal inputs to clamp fast-rising transients (<1 ns rise time) before they reach logic-level components. Use Value: Limits transient voltage to ≤126 V during 4.8 A surges, preventing damage to 5 V or 12 V logic supplies and maintaining system uptime in factory automation systems. |
Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive 10/1000 µs pulses induced by alternator switching and battery disconnection events. Use Value: Withstands 0.01% duty cycle surges while maintaining <1 µA leakage at 78 V, preserving low-power sleep mode integrity in BCM ECUs. |
| Telecom Power Feeds | Industrial PLC Analog Inputs |
Use Scenario: Overvoltage protection on -48 V DC telecom power distribution boards subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on input stage, coordinated with upstream fuses and downstream DC-DC converters to limit let-through energy. Use Value: Delivers 600 W pulse handling with 126 V clamping - keeps downstream regulators within safe SOA during 4 kV IEC 61000-4-5 tests. |
Use Scenario: Protection of 4–20 mA current loop receivers and precision ADC front-ends from ESD and field-wiring transients. IC Role / Device Role / Timing Role: Low-capacitance (typ. 100 pF at 0 V) bidirectional shunt element placed directly at connector entry point. Use Value: Clamps transients to 126 V without distorting analog signals due to symmetrical response and minimal leakage (<1 µA at 78 V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CA-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | Required for halogen-free BOM compliance in EU industrial equipment. | Select when environmental compliance mandates halogen-free materials without altering layout or performance. |
| SMCJ78CA-E3/2A | Same VWM/VC but in larger SMC (DO-214AB) package; higher PPPM = 1500 W; RθJA = 40 °C/W. | Suitable for higher-energy surge environments where 600 W is insufficient and board space allows larger footprint. | Choose only if surge test levels exceed 4 kV or thermal management requires lower junction temperature rise. |
Compared with SMBJ78CA-E3/5B, the M3/5B offers identical protection performance with halogen-free construction, while the SMCJ78CA-E3/2A provides 2.5× higher pulse power in a physically larger package - making SMBJ78CA-E3/5B optimal for space-constrained, cost-sensitive 4 kV surge designs.
Availability
SMBJ78CA-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and PLC analog inputs requiring stable component supply and long-term production continuity.
Supply support for SMBJ78CA-E3/5B 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 industrial, automotive, and telecom applications where robustness against ESD, EFT, and lightning surges is critical.
FAQ
What is the clamping voltage of SMBJ78CA-E3/5B at its rated peak pulse current?
The SMBJ78CA-E3/5B 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 confirmed in the Vishay datasheet Document Number 88392, page 2, and defines the upper voltage limit imposed on protected circuits during surge events. The SMBJ78CA-E3/5B maintains this clamping performance bidirectionally, ensuring consistent protection regardless of transient polarity.
Is SMBJ78CA-E3/5B suitable for automotive applications?
SMBJ78CA-E3/5B is AEC-Q101 qualified when ordered with HE3 or HM3 suffixes (e.g., SMBJ78CAHE3_B/I); the -E3/5B variant itself is commercial-grade and not AEC-Q101 certified. For non-automotive industrial or telecom use, SMBJ78CA-E3/5B delivers full specification compliance including UL 497B recognition and MSL Level 1. Engineers must select SMBJ78CAHE3_B/I explicitly for automotive body control or infotainment systems requiring AEC-Q101 validation. The SMBJ78CA-E3/5B remains appropriate for under-hood-adjacent industrial controls where AEC-Q101 is not mandated.
What is the standoff voltage rating of SMBJ78CA-E3/5B, and how does it relate to system operating voltage?
The SMBJ78CA-E3/5B has a reverse stand-off voltage (VWM) of 78 V, meaning it remains non-conductive up to this DC or RMS voltage level with leakage <1 µA. This rating is selected to be ~15–20% above nominal system rail voltages - for example, it protects 48 V or 60 V DC power buses while avoiding false triggering during normal operation or minor overvoltage excursions. The SMBJ78CA-E3/5B's VWM ensures reliable blocking during steady-state conditions while enabling rapid clamping when transients exceed 86.7 V (minimum VBR).
Does SMBJ78CA-E3/5B have polarity markings, and how is it mounted on PCB?
No - SMBJ78CA-E3/5B is a bidirectional TVS and carries no cathode band or polarity marking, unlike unidirectional variants. It is mounted in the SMB (DO-214AA) package with symmetrical terminals, allowing either end to connect to line or return without orientation constraints. The device uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and is designed for reflow soldering on standard 5.0 mm × 5.0 mm copper pads per terminal. Mounting follows the Vishay-recommended pad layout in Document Number 88392, page 5.
How does the thermal performance of SMBJ78CA-E3/5B affect its surge handling capability?
The SMBJ78CA-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 5.0 mm × 5.0 mm copper pads. This limits its ability to sustain repetitive surges above 0.01% duty cycle without junction overheating, as specified in Figure 2 of the datasheet. Derating is required above TA = 25 °C - for example, at 70 °C ambient, its peak pulse power must be reduced to ~420 W to maintain TJ ≤ 150 °C. The SMBJ78CA-E3/5B's thermal design supports single-event surge protection but requires careful layout for high-duty-cycle applications.
SMBJ78CA-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ78CA-E3/5B FAQ
1.How can I place an order for SMBJ78CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CA-E3/5B 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 SMBJ78CA-E3/5B reliable?
The price and inventory of SMBJ78CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ78CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CA-E3/5B?
SMBJ78CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CA-E3/5B 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 SMBJ78CA-E3/5B?
For technical support, including SMBJ78CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ78CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ78CA-E3/5B 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 SMBJ78CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ78CA-E3/5B?
All SMBJ78CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CA-E3/5B, 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 SMBJ78CA-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ78CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CA-E3/5B Tags
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