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Vishay General Semiconductor - Diodes Division SMBJ78D-M3/I
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- Part No.:
- SMBJ78D-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78D-M3/I.pdf
- Description:
- TVS DIODE 78VWM 124VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,966
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Product details
Overview
SMBJ78D-M3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on DC power rails and signal lines. It features a 78 V stand-off voltage (VWM), 88.1–94.4 V breakdown voltage (VBR) at 1 mA, 124 V maximum clamping voltage (VC) at 4.86 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ78D-M3/I datasheet, SMBJ78D-M3/I pinout, SMBJ78D-M3/I application, or SMBJ78D-M3/I equivalent, key selection criteria include its unidirectional polarity, ±3.5 % VBR tolerance, low leakage (<0.5 μA at VWM), M3 halogen-free RoHS-compliant construction, and suitability for automated SMT placement on PCBs requiring IEC 61000-4-2/4-4/4-5 level ESD/surge protection.
Technical Context
This TVS diode operates as a clamping device that remains non-conductive below 78 V and rapidly avalanches above its 88.1–94.4 V breakdown threshold to limit transient overvoltages. Its junction-to-ambient thermal resistance is 125 °C/W on minimum pad layout, enabling reliable operation up to 150 °C junction temperature under defined surge conditions.
The SMBJ78D-M3/I delivers 600 W peak pulse power handling per 10/1000 μs waveform at 0.01 % duty cycle, with clamping performance validated at 4.86 A IPPM and 124 V VC. Its low incremental surge resistance and fast response time ensure effective suppression of lightning-induced surges and inductive switching spikes in DC-fed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 88.1 V / 94.4 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on across production lots |
| VC @ IPPM | 124 V at 4.86 A - clamping voltage defines worst-case overvoltage seen by protected circuitry |
| PPPM | 600 W - peak surge energy absorption capability with standard 10/1000 μs test waveform |
| ID @ VWM | <0.5 μA - ultra-low leakage preserves efficiency in high-impedance bias or sensing paths |
| TJ max | 150 °C - maximum junction temperature rating supports operation in enclosed industrial enclosures |
| RθJA | 125 °C/W - thermal resistance on minimum recommended PCB pad layout dictates derating requirements |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity indicated by cathode band on one end. Matte tin-plated leads meet J-STD-002 solderability and JESD 22-B102 whisker resistance (Class 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential rail; current flows from cathode to anode during clamping |
| Cathode | High-side connection point | Marked with band; connected to protected line (e.g., +78 V rail); conducts avalanche current to ground when overvoltage occurs |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise coordination with system overvoltage thresholds without margin stacking |
| 600 W PPPM (10/1000 μs) | Supports IEC 61000-4-5 Level 3 (1 kV line-to-line, 2 kV line-to-ground) surge compliance |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| M3 suffix construction | Halogens-free, RoHS-compliant, and qualified to JESD 201 Class 2 whisker resistance for long-term reliability |
| Low ID <0.5 μA | Minimizes standby power loss and avoids false triggering in high-impedance monitoring circuits |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) Inputs |
|---|---|
Use Scenario: Protecting 78 V auxiliary power rails in programmable logic controller (PLC) backplanes against load dump and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between input rail and chassis ground to shunt transient energy before it reaches DC/DC converters and microcontrollers. Use Value: Limits voltage excursion to ≤124 V during 4.86 A surges, preventing latch-up or gate oxide damage in downstream 80 V-rated MOSFETs and LDOs. | Use Scenario: Safeguarding LIN bus interface inputs and sensor supply lines in BCMs exposed to battery transients and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Standoff-rated TVS on 78 V battery-sensed subsystem rails, providing fast-response clamping without loading normal operation. Use Value: Withstand repetitive 10/1000 μs surges up to 600 W while maintaining sub-μA leakage, preserving signal integrity and sleep-mode current budgets. |
| Telecom Remote Radio Unit (RRU) DC Feeds | Factory Automation Sensor Hub Protection |
Use Scenario: Securing 78 V DC power input to remote radio units mounted on cell towers subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end TVS on outdoor-rated power entry board, coordinated with upstream GDT and downstream π-filter. Use Value: Clamps induced surges within 1 ns to ≤124 V, meeting Telcordia GR-1089-CORE Level 3 immunity requirements for outdoor infrastructure. | Use Scenario: Shielding analog input channels and digital I/O of modular sensor hubs connected to 78 V fieldbus power in harsh manufacturing environments. IC Role / Device Role / Timing Role: Point-of-load TVS adjacent to connector pins to intercept ESD and switching noise before reaching ADC front-ends and isolators. Use Value: Prevents measurement offset drift and communication errors caused by sub-100 ns transients, leveraging 88.1–94.4 V VBR precision for consistent trip behavior. |
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-M3/I | Bidirectional variant with same VWM (78 V) but symmetric clamping in both polarities; higher capacitance due to dual-junction structure | Suitable only where AC-coupled or floating lines require protection against reverse polarity faults | Select SMBJ78A-M3/I only if bidirectional clamping is required; SMBJ78D-M3/I is optimal for DC rails with defined polarity. |
| SMCJ78A-M3/I | Larger SMC (DO-214AB) package with higher 1500 W PPPM rating and lower RθJA (60 °C/W), but same VWM/VBR/VC specs | Used where higher surge endurance or better thermal dissipation is needed, e.g., in high-power motor drives | Choose SMCJ78A-M3/I when 600 W is insufficient or board layout allows larger footprint; SMBJ78D-M3/I fits space-constrained SMB layouts. |
Compared with SMBJ78A-M3/I and SMCJ78A-M3/I, the SMBJ78D-M3/I offers the smallest PCB footprint among 78 V unidirectional TVS diodes with 600 W rating, optimized for cost-sensitive, high-density industrial and telecom designs where polarity is fixed and surge levels are within specification.
Availability
SMBJ78D-M3/I is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom remote radio units, and factory automation sensor hubs requiring stable component supply and long-term obsolescence management.
Supply support for SMBJ78D-M3/I 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, precision, and application-specific optimization.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust, high-energy transient suppression in demanding industrial, automotive, and communications infrastructure applications.
FAQ
What is the breakdown voltage range of the SMBJ78D-M3/I?
The SMBJ78D-M3/I has a guaranteed breakdown voltage (VBR) range of 88.1 V to 94.4 V at 1 mA test current, reflecting its ±3.5 % tolerance. This tight specification ensures consistent clamping behavior across production units and simplifies coordination with system-level overvoltage protection thresholds in designs using the SMBJ78D-M3/I.
Does the SMBJ78D-M3/I support lead-free reflow soldering?
Yes, the SMBJ78D-M3/I is rated MSL Level 1 with a maximum peak reflow temperature of 260 °C, fully compatible with standard lead-free soldering processes. Its matte tin-plated terminals meet J-STD-002 and JESD 22-B102 requirements, and the M3 suffix confirms qualification to JESD 201 Class 2 whisker resistance - all verified for the SMBJ78D-M3/I.
What is the maximum clamping voltage of the SMBJ78D-M3/I under surge conditions?
The SMBJ78D-M3/I exhibits a maximum clamping voltage (VC) of 124 V at its rated peak pulse current (IPPM) of 4.86 A, measured using the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is a critical parameter for validating safe operation of downstream components with the SMBJ78D-M3/I.
How does the SMBJ78D-M3/I differ from bidirectional variants like SMBJ78A-M3/I?
The SMBJ78D-M3/I is unidirectional, featuring a cathode band and conducting only when the cathode is positive relative to the anode - ideal for DC rail protection. In contrast, SMBJ78A-M3/I is bidirectional with no polarity marking and clamps in both directions. Their VWM, VBR, and VC values differ accordingly, making the SMBJ78D-M3/I unsuitable for AC or floating-line applications where SMBJ78A-M3/I would be required.
Is the SMBJ78D-M3/I compliant with RoHS and halogen-free standards?
Yes, the "M3" suffix in SMBJ78D-M3/I explicitly denotes halogen-free, RoHS-compliant construction and industrial-grade qualification. Vishay documentation confirms this part meets material categorization requirements per www.vishay.com/doc?99912, with molding compound rated UL 94 V-0 and terminals free of brominated flame retardants - fully documented for the SMBJ78D-M3/I.
SMBJ78D-M3/I 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 88.1V
- Voltage - Clamping (Max) @ Ipp:
- 124V
- Current - Peak Pulse (10/1000µs):
- 4.86A
- 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)
SMBJ78D-M3/I FAQ
1.How can I place an order for SMBJ78D-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78D-M3/I 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 SMBJ78D-M3/I reliable?
The price and inventory of SMBJ78D-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78D-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ78D-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78D-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78D-M3/I?
SMBJ78D-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78D-M3/I 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 SMBJ78D-M3/I?
For technical support, including SMBJ78D-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78D-M3/I requirements.
6.How does Aetrix verify that SMBJ78D-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ78D-M3/I 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 SMBJ78D-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ78D-M3/I?
All SMBJ78D-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78D-M3/I, 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 SMBJ78D-M3/I part is unused and in its original packaging.
Return procedure for SMBJ78D-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78D-M3/I Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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