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Vishay General Semiconductor - Diodes Division SMBG78CA-E3/52
- Part No.:
- SMBG78CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG78CA-E3/52.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,464
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Product details
Overview
SMBG78CA-E3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for clamping voltage transients on signal or power lines. It features 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 automotive sensor interfaces and industrial I/O circuits against ESD and inductive switching surges.
For engineers reviewing the SMBG78CA-E3/52 datasheet, SMBG78CA-E3/52 pinout, SMBG78CA-E3/52 application, or SMBG78CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low leakage (<1.0 μA at VWM), thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with no cathode/anode marking - enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, while the MSL Level 1 moisture sensitivity rating supports lead-free reflow up to 260 °C peak.
The device delivers consistent clamping performance under repetitive 0.01% duty-cycle surges, with thermal derating above 25 °C per Fig. 2 and validated operation across -55 °C to +150 °C junction temperature range. It meets UL 497B recognition (QVGQ2) and complies with ANSI/IEEE C62.35 surge test standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for protected line. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - guaranteed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 126 V at 4.8 A - maximum clamped voltage during 10/1000 μs surge; determines worst-case stress on downstream ICs. |
| PPPM | 600 W - peak pulse power handling capacity; enables robust protection against lightning-induced or inductive-switching transients. |
| ID @ VWM | <1.0 μA - ultra-low reverse leakage; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max | +150 °C - maximum junction temperature; supports reliable operation in under-hood automotive or enclosed industrial environments. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.10 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Identical terminal behavior in both directions; connects to either side of protected line without orientation constraint. |
| Terminal 2 | Anode / Cathode (bidirectional) | Paired terminal forms symmetrical clamping path; requires no PCB-level polarity assignment during layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| 600 W peak pulse power (10/1000 μs) | Withstands high-energy transients common in 12 V/24 V vehicle power nets and industrial PLC backplanes. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture-related popcorn failure or delamination. |
| UL 497B recognized (QVGQ2) | Meets safety agency requirements for telecom and industrial surge protection modules requiring third-party certification. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., pressure, temperature) from load-dump and jump-start transients in engine control units. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to limit voltage excursions before reaching signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to microcontrollers and ADC front-ends by limiting transient voltage to ≤126 V during 4.8 A surge events. | Use Scenario: Safeguarding digital input/output channels on programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF at 0 V) shunt protector placed across isolated signal lines to divert fast-rising EFT bursts. Use Value: Maintains signal integrity with minimal loading due to sub-1 μA leakage at 78 V, avoiding false logic states in 24 V DC sensing circuits. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Secondary-side surge suppression on Ethernet PHY or RS-485 transceiver lines subjected to induced lightning surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) voltage clamp integrated into board-level surge protection stage alongside GDT or MOV primary elements. Use Value: Achieves precise clamping at 126 V with tight VBR tolerance (±5%), reducing overvoltage margin required for downstream TVS or IC selection. | Use Scenario: Input-stage transient suppression on AC-DC adapter secondary outputs feeding USB-C PD or smart home controllers. IC Role / Device Role / Timing Role: Standoff-rated protector absorbing capacitive discharge and hot-plug spikes before linear regulators or USB interface ICs. Use Value: Enables compact design via SMBG footprint and eliminates need for external series impedance due to inherent low Rsurge (<0.5 Ω typical). |
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-E3/52 | Same VWM/VBR/VC specs but lower PPPM (600 W vs. SMBJ's 600 W - identical rating), same SMB package but different thermal resistance (RθJA = 110 °C/W vs. SMBG's 100 °C/W). | Suitable for less thermally constrained layouts; slightly higher junction temperature rise under sustained surge conditions. | Select SMBG78CA-E3/52 when board space allows optimized pad layout (5.0 mm × 5.0 mm) for superior thermal dissipation. |
| SMCJ78CA-E3/52 | Same electrical specs but larger SMC (DO-214AB) package; higher IPPM (10.3 A vs. 4.8 A) and lower VC (123 V) due to larger junction area. | Better suited for high-current surge environments (e.g., 48 V industrial buses); requires larger PCB real estate and different stencil design. | Choose SMBG78CA-E3/52 where space is limited and 4.8 A peak surge coverage is sufficient per system-level threat model. |
Compared with SMBJ78CA-E3/52 and SMCJ78CA-E3/52, the SMBG78CA-E3/52 offers optimal balance of compact SMBG footprint, AEC-Q101 qualification, and verified 100 °C/W thermal resistance - making it preferred for automotive body electronics and space-constrained industrial modules requiring production-grade reliability.
Availability
SMBG78CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface, and telecom line interface applications requiring stable component supply and long-term lifecycle support.
Supply support for SMBG78CA-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBG series is engineered for high-reliability transient suppression in automotive, industrial, and telecom systems - delivering AEC-Q101-qualified performance in compact surface-mount packages with industry-leading clamping consistency.
FAQ
What is the maximum clamping voltage of SMBG78CA-E3/52 under standard test conditions?
The SMBG78CA-E3/52 has a maximum clamping voltage (VC) of 126 V when subjected to its rated peak pulse current of 4.8 A using the 10/1000 μs waveform. This value is measured at TA = 25 °C on 5.0 mm × 5.0 mm copper pads and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMBG78CA-E3/52 suitable for automotive applications?
Yes, SMBG78CA-E3/52 is AEC-Q101 qualified and explicitly listed in Vishay's automotive-grade product documentation. Its operating junction temperature range (-55 °C to +150 °C), MSL Level 1 reflow compatibility, and UL 497B recognition make it appropriate for under-hood and body-control module deployments where SMBG78CA-E3/52 serves as primary transient suppression.
Does SMBG78CA-E3/52 have polarity markings on the package?
No, SMBG78CA-E3/52 is a bidirectional TVS diode and carries no polarity marking on the SMBG (DO-215AA) case. Both terminals are functionally identical, allowing flexible placement across differential or AC-coupled signal paths without orientation constraints - a key distinction from unidirectional variants like SMBG78A-E3/52.
What is the reverse leakage current specification for SMBG78CA-E3/52 at its stand-off voltage?
At its 78 V stand-off voltage (VWM), the SMBG78CA-E3/52 exhibits a maximum reverse leakage current (ID) of 1.0 μA at TA = 25 °C. This ultra-low leakage ensures minimal power loss and avoids interference with high-impedance sensing nodes, supporting accurate measurements in precision analog front-ends protected by SMBG78CA-E3/52.
How does the thermal resistance of SMBG78CA-E3/52 affect its surge handling capability?
SMBG78CA-E3/52 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 value directly impacts its ability to sustain repetitive surges: higher ambient temperatures require derating per Fig. 2 in the datasheet, and proper pad layout is essential to maintain SMBG78CA-E3/52 within its 150 °C TJ limit during burst-mode operation.
SMBG78CA-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- 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 (SMBG)
SMBG78CA-E3/52 FAQ
1.How can I place an order for SMBG78CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG78CA-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 SMBG78CA-E3/52 reliable?
The price and inventory of SMBG78CA-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 SMBG78CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBG78CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG78CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG78CA-E3/52?
SMBG78CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG78CA-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 SMBG78CA-E3/52?
For technical support, including SMBG78CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG78CA-E3/52 requirements.
6.How does Aetrix verify that SMBG78CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG78CA-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 SMBG78CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBG78CA-E3/52?
All SMBG78CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG78CA-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 SMBG78CA-E3/52 part is unused and in its original packaging.
Return procedure for SMBG78CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG78CA-E3/52 Tags
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