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Vishay General Semiconductor - Diodes Division SMBG78A-E3/52
- Part No.:
- SMBG78A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG78A-E3/52.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,391
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Product details
Overview
SMBG78A-E3/52 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of DC power rails and signal 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 - deployed in automotive power electronics, industrial sensor interfaces, and telecom line protection.
For engineers reviewing the SMBG78A-E3/52 datasheet, SMBG78A-E3/52 pinout, SMBG78A-E3/52 application, or SMBG78A-E3/52 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C junction temperature rating, low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1 μA leakage at 78 V), then rapidly avalanches when transient voltage exceeds VBR, clamping the protected node to ≤126 V at 4.8 A. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns), while the SMBG package provides MSL Level 1 moisture sensitivity and 260 °C lead-free solder compatibility.
The device is rated for non-repetitive 8.3 ms half-sine surge current up to 100 A (IFSM) and exhibits thermal resistance of 100 °C/W (junction-to-ambient) on standard PCB pads. It meets UL 497B recognition (QVGQ2) and is qualified per AEC-Q101 for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - guaranteed avalanche onset range defining protection threshold |
| VC @ IPPM | 126 V at 4.8 A - clamped voltage during 10/1000 μs transient, limiting stress on downstream ICs |
| PPPM | 600 W - peak pulse power handling capability under standardized surge waveform |
| IFSM | 100 A - maximum non-repetitive forward surge current (8.3 ms half-sine), critical for load-dump immunity |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Leakage @ VWM | 1.0 μA - ultra-low reverse leakage preserves system standby power integrity |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, gull-wing leads, matte tin-plated, RoHS-compliant (E3 suffix), MSL Level 1, 260 °C reflow compatible. Cathode indicated by band marking on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; completes clamping loop during transient |
| Cathode | High-side connection point | Connected to protected line (e.g., 78 V rail); polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter stability under thermal stress |
| 600 W 10/1000 μs pulse rating | Provides margin against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges |
| MSL Level 1 rating | Enables direct use in high-volume SMT assembly without baking or special handling |
| UL 497B recognition (QVGQ2) | Confirms compliance for telecom and industrial equipment safety certification |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 78 V auxiliary power bus in commercial vehicle ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between rail and chassis ground, triggered within nanoseconds upon overvoltage. Use Value: Clamps transients to ≤126 V, preventing damage to 100 V-rated MOSFETs and microcontrollers downstream. | Use Scenario: Safeguarding analog input lines of 4–20 mA current-loop sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground, cathode-to-signal line, absorbing induced EFT and surge energy. Use Value: Limits voltage excursion to safe levels while maintaining <1 μA leakage, preserving measurement accuracy and offset stability. |
| Telecom Line Interface Protection | DC Power Supply Input Protection |
Use Scenario: Front-end protection of PoE-powered Ethernet switch ports exposed to lightning-induced surges on data pairs. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices on differential pairs, referenced to common-mode ground plane. Use Value: Delivers 600 W surge handling per line with sub-126 V clamping, meeting IEC 61000-4-5 Level 4 requirements. | Use Scenario: Input-stage protection of 78 V DC-DC converters in railway signaling systems subject to EN 50155 transients. IC Role / Device Role / Timing Role: Primary shunt clamp on converter input, coordinated with upstream fuse and inductor filtering. Use Value: Withstands 100 A 8.3 ms surge (load dump), ensuring converter survival without derating or oversized input capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78A-E3/52 | Same VWM/VBR/VC specs but lower PPPM = 600 W (same rating), different package: SMB (DO-214AA), slightly larger footprint and higher RθJA (110 °C/W) | Less suitable for space-constrained automotive modules; requires larger pad layout | Select SMBG78A-E3/52 for tighter board area, lower profile, and superior thermal performance on minimal copper pads. |
| SMCJ78A-E3/52 | Higher PPPM = 1500 W, same VWM/VBR, but larger SMC (DO-214AB) package and higher VC = 127 V at 12.3 A | Better for high-energy surges (e.g., ISO 16750-2), but overkill for typical 600 W requirement and increases BOM cost | Choose SMBG78A-E3/52 where 600 W rating suffices and PCB real estate or height is constrained. |
Compared with SMBJ78A-E3/52 and SMCJ78A-E3/52, SMBG78A-E3/52 delivers identical electrical protection performance in a smaller, lower-profile SMBG package with better thermal resistance (100 vs. 110 °C/W) - optimizing board density and thermal margin for automotive and industrial SMT designs.
Availability
SMBG78A-E3/52 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom line surge suppression requiring stable component supply across production lifecycles.
Supply support for SMBG78A-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, AEC-Q qualification, and application-specific performance.
The SMBG series was engineered for high-reliability surface-mount transient suppression in space-constrained automotive and industrial environments, balancing low profile, robust surge handling, and automated assembly compatibility.
FAQ
What is the maximum clamping voltage of SMBG78A-E3/52 and under what test condition?
The SMBG78A-E3/52 has a maximum clamping voltage (VC) of 126 V, measured at a peak pulse current (IPPM) of 4.8 A using the standardized 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on the protected circuit during transient events and is critical for ensuring downstream components remain within their absolute maximum ratings.
Is SMBG78A-E3/52 suitable for automotive applications, and what qualification does it hold?
Yes, SMBG78A-E3/52 is explicitly AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS subsystems. The E3 suffix denotes RoHS-compliant, industrial-grade construction, and the device meets UL 497B recognition (QVGQ2) for safety-critical surge protection in vehicular systems.
What is the thermal resistance of SMBG78A-E3/52, and how does it affect PCB layout?
The SMBG78A-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 minimum recommended pad layout; reducing pad area increases thermal resistance and may limit surge duty cycle. For sustained or repetitive transients, designers should verify junction temperature rise using this RθJA and actual power dissipation.
How does the SMBG78A-E3/52 differ from bidirectional variants like SMBG78CA?
The SMBG78A-E3/52 is unidirectional, with polarity marked by a cathode band and intended for DC rail protection where reverse conduction must be blocked. In contrast, SMBG78CA is bidirectional, symmetrical in both directions, and used in AC or differential signal lines. Their VBR and VC values differ: SMBG78A-E3/52 has VBR = 86.7–95.8 V, while SMBG78CA has VBR = 86.7–95.8 V in each direction but no forward voltage drop specification.
What packaging and reel configuration is supplied for SMBG78A-E3/52?
SMBG78A-E3/52 is supplied in 7" diameter plastic tape and reel format, with a base quantity of 750 devices per reel (package code /52). The tape conforms to EIA-481 standards, supports high-speed pick-and-place, and the E3 suffix confirms RoHS compliance and industrial-grade reliability - making it ready for automated SMT lines without special handling.
SMBG78A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBG78A-E3/52 FAQ
1.How can I place an order for SMBG78A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG78A-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 SMBG78A-E3/52 reliable?
The price and inventory of SMBG78A-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 SMBG78A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBG78A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG78A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG78A-E3/52?
SMBG78A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG78A-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 SMBG78A-E3/52?
For technical support, including SMBG78A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG78A-E3/52 requirements.
6.How does Aetrix verify that SMBG78A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG78A-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 SMBG78A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBG78A-E3/52?
All SMBG78A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG78A-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 SMBG78A-E3/52 part is unused and in its original packaging.
Return procedure for SMBG78A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG78A-E3/52 Tags
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