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Vishay General Semiconductor - Diodes Division SMBJ78C-E3/52
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- Part No.:
- SMBJ78C-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78C-E3/52.pdf
- Description:
- TVS DIODE 78VWM 139VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,207
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Product details
Overview
SMBJ78C-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping fast-rising 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ78C-E3/52 datasheet, SMBJ78C-E3/52 pinout, SMBJ78C-E3/52 application, or SMBJ78C-E3/52 equivalent, key selection criteria include verified clamping performance under 10/1000 µs surge, unidirectional polarity with cathode band marking, RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on standard PCB pad layouts per JEDEC DO-214AA.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its VBR threshold, limiting transient energy to downstream circuitry. Its low incremental surge resistance and sub-nanosecond response time ensure effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
The SMBJ78C-E3/52 is rated for 150 °C maximum junction temperature, exhibits 0.106 %/°C temperature coefficient of VBR, and meets MSL Level 1 per J-STD-020 with 260 °C peak reflow profile - confirming suitability for high-reliability commercial applications without derating penalties.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR @ IT = 1 mA | 86.7–95.8 V - Verified breakdown range ensures consistent turn-on across production lots under standardized test conditions. |
| VC @ IPPM = 4.8 A | 126 V - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 600 W - Peak pulse power handling capability with 0.01 % duty cycle; supports repetitive surge events in industrial environments. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against accidental polarity reversal. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; enables thermal design validation without heatsinking. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm max length, 4.06 mm max width, and 2.20 mm max height; compatible with IPC-7351B footprint. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, cathode indicated by a visible band on one end. Meets UL 94 V-0 flammability rating and JESD 22-B102 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side of protected line; establishes reference for unidirectional clamping action. |
| Cathode | Avalanche conduction terminal / Surge return path | Marked with band; ties to higher-potential rail (e.g., VCC or signal line); conducts surge current to ground or rail during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without external series impedance. |
| 126 V clamping voltage at 4.8 A | Ensures protected 75 V-rated MOSFETs or 100 V-input DC-DC controllers remain within safe SOA limits during surge events. |
| MSL Level 1 moisture sensitivity | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and avoiding thermal stress on adjacent components. |
| Glass passivated junction | Provides stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure per JESD22-A101. |
| RoHS-compliant, halogen-free option available | Supports compliance with EU RoHS Directive 2011/65/EU and IPC-1752A material declarations for export-controlled designs. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O pins from inductive kickback during relay or solenoid switching in PLC output stages. IC Role / Device Role / Timing Role: Unidirectional TVS placed between MOSFET gate and source, clamping negative-going transients below -0.7 V while allowing normal PWM operation. Use Value: Prevents latch-up or oxide damage in 3.3 V/5 V logic interfaces exposed to >100 V transients, validated per ISO 7637-2 Pulse 1 and Pulse 3a. |
Use Scenario: Input protection for LIN bus transceivers and door module window motor drivers subjected to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail upstream of LDO regulators, absorbing 10/1000 µs surges up to 600 W without crowbarring. Use Value: Maintains system uptime during battery disconnection/reconnection events by limiting rail voltage to ≤126 V, preserving regulator input SOA. |
| Telecom Power Feeds | Consumer Appliance Control Boards |
|
Use Scenario: Secondary-side surge protection on 48 V PoE-powered Ethernet switch ports and remote PHY interfaces. IC Role / Device Role / Timing Role: Fast-response clamping device placed across DC-DC converter inputs to limit transient propagation into isolated feedback circuits. Use Value: Achieves <1 ns response time to clamp 1 kV EFT bursts (IEC 61000-4-4) before sensitive analog front-ends saturate or reset. |
Use Scenario: Overvoltage safeguard for microcontroller reset lines and AC zero-crossing detection circuits in washing machine main control units. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA at 78 V) unidirectional suppressor tied between MCU reset pin and ground, blocking false resets during compressor startup. Use Value: Guarantees <100 ns clamping latency to prevent spurious brown-out detection during 600 V/10 µs surge events on mains-coupled control traces. |
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-E3/52 | Same VWM (78 V), identical VBR and VC specs, but marked "A" instead of "C"; no functional distinction per Vishay documentation. | No difference - both are unidirectional variants; "C" suffix is legacy marking variant, not a specification change. | Select SMBJ78C-E3/52 when matching existing BOMs referencing "C"-suffixed part numbers or legacy schematics. |
| SMCJ78A-E3/52 | Same electrical ratings but in larger SMC (DO-214AB) package; 1500 W PPPM rating vs. 600 W; 2.5× higher thermal mass and 30 % larger footprint. | Used where higher surge endurance or improved thermal dissipation is required, e.g., outdoor telecom enclosures with extended ambient temperature range. | Choose SMBJ78C-E3/52 for space-constrained designs where 600 W rating suffices and PCB real estate is limited to SMB footprint. |
Compared with SMBJ78A-E3/52, SMBJ78C-E3/52 offers identical protection performance in the same SMB package; versus SMCJ78A-E3/52, it trades surge headroom and thermal margin for compactness and compatibility with dense SMT layouts.
Availability
SMBJ78C-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ78C-E3/52 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, TVS devices, and optoelectronics with emphasis on reliability, precision, and high-volume manufacturability.
The SMBJ series was developed specifically for surface-mount transient suppression in space-constrained, high-surge industrial and automotive systems - balancing clamping accuracy, surge robustness, and automated assembly compatibility.
FAQ
What is the maximum clamping voltage of SMBJ78C-E3/52 under a 10/1000 µs surge?
The SMBJ78C-E3/52 has a maximum clamping voltage (VC) of 126 V when subjected to its rated peak pulse current of 4.8 A with a 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ78C-E3/52 maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMBJ78C-E3/52 RoHS-compliant and lead-free?
Yes, SMBJ78C-E3/52 is RoHS-compliant and lead-free, as confirmed by the "E3" suffix in its ordering code. It uses matte tin-plated terminations and meets J-STD-002 solderability standards. The molding compound complies with UL 94 V-0 flammability rating, and the device is classified under Vishay's commercial-grade, halogen-free material categorization per document 99912.
Does SMBJ78C-E3/52 have AEC-Q101 qualification?
No, SMBJ78C-E3/52 is not AEC-Q101 qualified. It carries the "E3" commercial-grade suffix. For automotive-qualified equivalents, Vishay offers the SMBJ78AHE3 variant (with "HE3" suffix), which undergoes additional stress testing per AEC-Q101. The SMBJ78C-E3/52 remains suitable for industrial and consumer applications where AEC-Q101 is not mandated.
What is the thermal resistance of SMBJ78C-E3/52, and how does it affect layout?
The SMBJ78C-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard JEDEC DO-214AA pad layout; increasing copper area or adding thermal vias reduces RθJA. Layout must follow Vishay's recommended mounting pad dimensions to ensure rated power dissipation and avoid thermal runaway during repetitive surge events.
How does SMBJ78C-E3/52 differ from bidirectional SMBJ78CA variants?
SMBJ78C-E3/52 is unidirectional, with polarity marked by a cathode band and intended for DC-biased lines like power rails or signal paths referenced to ground. Bidirectional variants (e.g., SMBJ78CA) lack polarity marking and suppress transients in both directions - suitable for AC lines or differential buses. The SMBJ78C-E3/52 cannot substitute for SMBJ78CA in symmetrical surge environments without circuit redesign.
SMBJ78C-E3/52 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:
- 139V
- Current - Peak Pulse (10/1000µs):
- 4.3A
- 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)
SMBJ78C-E3/52 FAQ
1.How can I place an order for SMBJ78C-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78C-E3/52 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 SMBJ78C-E3/52 reliable?
The price and inventory of SMBJ78C-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78C-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ78C-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78C-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78C-E3/52?
SMBJ78C-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78C-E3/52 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 SMBJ78C-E3/52?
For technical support, including SMBJ78C-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78C-E3/52 requirements.
6.How does Aetrix verify that SMBJ78C-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ78C-E3/52 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 SMBJ78C-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ78C-E3/52?
All SMBJ78C-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78C-E3/52, 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 SMBJ78C-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ78C-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78C-E3/52 Tags
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