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Vishay General Semiconductor - Diodes Division SMBG78AHE3/5B
- Part No.:
- SMBG78AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG78AHE3/5B.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,254
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Product details
Overview
SMBG78AHE3/5B 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 and industrial sensor interfaces.
For engineers reviewing the SMBG78AHE3/5B datasheet, SMBG78AHE3/5B pinout, SMBG78AHE3/5B application, or SMBG78AHE3/5B equivalent, key selection criteria include clamping performance under 4.8 A surge, AEC-Q101 qualification for automotive use, RoHS compliance with HE3 suffix, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This unidirectional TVS diode operates as a shunt-clamping device, conducting when reverse voltage exceeds VBR to limit transient energy across protected circuit nodes. Its glass-passivated junction ensures stable leakage (<1.0 μA at 78 V) and fast response time (<1.0 ns), critical for safeguarding MOSFET gates and microcontroller I/O against ESD and inductive switching spikes.
Thermal design relies on RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), enabling reliable operation up to +150 °C junction temperature. The device is rated for 100 A non-repetitive forward surge (8.3 ms half-sine) and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - defines precise breakdown threshold for predictable clamping onset |
| VC @ IPPM | 126 V at 4.8 A - limits transient voltage seen by downstream ICs during 10/1000 μs surge |
| PPPM | 600 W - peak pulse power handling capability under standardized lightning/surge test waveform |
| IFSM | 100 A - single half-sine surge current rating (8.3 ms), supporting high-energy load dump events |
| Junction Temp | -55 °C to +150 °C - enables deployment in under-hood automotive and industrial environments |
| AEC-Q101 | Qualified - validated for automotive reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or return path; completes clamping loop during overvoltage event |
| Cathode | Protected line input | Connected to supply rail or signal line being protected; carries full surge current to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TCT, and ESD testing per stress requirements |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage drift over temperature and lifetime |
| MSL Level 1 rating | Supports standard SMT reflow without moisture sensitivity concerns (peak 260 °C) |
| 600 W 10/1000 μs capability | Provides robust protection against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between power rail and chassis ground to divert surge energy away from PMICs and microcontrollers. Use Value: Clamps to ≤126 V during 4.8 A surge, maintaining safe operating voltage for downstream 16 V-rated components. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; this unidirectional SMBG78AHE3/5B protects DC-supplied sensor lines referenced to system ground. Use Value: Sub-1 ns response ensures clamping activation before transient propagates into ADC front-end or op-amp buffer stages. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Protection |
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges on central office equipment. IC Role / Device Role / Timing Role: Reverse-biased across input capacitor to clamp positive transients while allowing normal negative DC operation. Use Value: 78 V VWM provides sufficient margin above -48 V nominal, with 126 V VC preventing damage to downstream DC/DC controllers. | Use Scenario: Shielding high-side N-channel MOSFET gate drivers from Miller-induced voltage spikes during switching. IC Role / Device Role / Timing Role: Connected anode-to-ground, cathode-to-gate, clamping gate-source voltage during dV/dt events. Use Value: Fast response and low VC prevent unintended turn-on or oxide stress in gate dielectrics during hard-switching transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBG78AHM3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification | No functional difference; selected where halogen-free material compliance is mandated | Choose SMBG78AHM3/5B when environmental compliance requires halogen-free construction |
| SMBJ78AHE3/5B | Same VWM/VBR/VC, but in larger SMB (DO-214AA) package with higher IPPM (12.3 A) and PPPM (600 W still) | Better thermal dissipation and surge margin; requires larger PCB footprint | Choose SMBJ78AHE3/5B when higher surge current handling (>4.8 A) or improved thermal performance is required |
Compared with SMBG78AHE3/5B, SMBG78AHM3/5B offers identical protection performance with halogen-free materials, while SMBJ78AHE3/5B trades compact size for greater surge current capacity and thermal robustness - enabling design flexibility based on space constraints and surge severity requirements.
Availability
SMBG78AHE3/5B is available at Aetrix Electronics and suitable for automotive control units, industrial sensor systems, and telecom power supplies requiring stable component supply with AEC-Q101 assurance and RoHS compliance.
Supply support for SMBG78AHE3/5B 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, TVS devices, and optoelectronics with emphasis on reliability 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, AEC-Q101 compliance, and repeatable clamping behavior.
FAQ
What is the clamping voltage of SMBG78AHE3/5B at its rated peak pulse current?
The SMBG78AHE3/5B has a maximum clamping voltage (VC) of 126 V at its specified peak pulse current (IPPM) of 4.8 A, measured using the 10/1000 μs standard waveform. This value ensures protected circuits remain within safe voltage limits during surge events. The SMBG78AHE3/5B achieves this clamping performance while maintaining low incremental resistance, critical for minimizing overshoot in fast transients.
Is SMBG78AHE3/5B suitable for automotive applications?
Yes, SMBG78AHE3/5B is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, body electronics, and ADAS power domains. Its construction includes glass-passivated junction, MSL Level 1 rating, and operation up to +150 °C junction temperature. The SMBG78AHE3/5B also meets ISO 7637-2 and IEC 61000-4-5 surge immunity requirements when applied per recommended layout guidelines.
What does the "HE3" suffix indicate in SMBG78AHE3/5B?
The "HE3" suffix in SMBG78AHE3/5B denotes RoHS-compliant, AEC-Q101-qualified construction with matte tin-plated leads. It distinguishes this variant from base industrial-grade (E3) or halogen-free (HM3) versions. The SMBG78AHE3/5B meets JESD 201 Class 2 whisker resistance and is rated for lead-free reflow up to 260 °C peak, confirming suitability for modern automotive and industrial SMT assembly processes.
How does SMBG78AHE3/5B differ from SMBJ78AHE3/5B?
SMBG78AHE3/5B uses the smaller SMBG (DO-215AA) package, while SMBJ78AHE3/5B uses the larger SMB (DO-214AA) package. Both share identical VWM (78 V), VBR, and PPPM (600 W), but SMBJ78AHE3/5B supports higher IPPM (12.3 A vs. 4.8 A) due to better thermal mass. The SMBG78AHE3/5B is preferred where board space is constrained; SMBJ78AHE3/5B is selected when higher surge margin or thermal headroom is needed.
What is the maximum reverse leakage current for SMBG78AHE3/5B at rated stand-off voltage?
The SMBG78AHE3/5B exhibits a maximum reverse leakage current (ID) of 1.0 μA at its rated stand-off voltage (VWM) of 78 V and ambient temperature of 25 °C. This low leakage ensures minimal power loss in always-on systems and prevents false triggering in high-impedance sensing circuits. The SMBG78AHE3/5B maintains this specification across its full operating temperature range, verified per AEC-Q101 stress testing protocols.
SMBG78AHE3/5B 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG78AHE3/5B FAQ
1.How can I place an order for SMBG78AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG78AHE3/5B 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 SMBG78AHE3/5B reliable?
The price and inventory of SMBG78AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG78AHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBG78AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG78AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG78AHE3/5B?
SMBG78AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG78AHE3/5B 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 SMBG78AHE3/5B?
For technical support, including SMBG78AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG78AHE3/5B requirements.
6.How does Aetrix verify that SMBG78AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG78AHE3/5B 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 SMBG78AHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBG78AHE3/5B?
All SMBG78AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG78AHE3/5B, 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 SMBG78AHE3/5B part is unused and in its original packaging.
Return procedure for SMBG78AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG78AHE3/5B Tags
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