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Vishay General Semiconductor - Diodes Division SMBG78AHE3/52
- Part No.:
- SMBG78AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG78AHE3/52.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,646
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Product details
Overview
SMBG78AHE3/52 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.
For engineers reviewing the SMBG78AHE3/52 datasheet, SMBG78AHE3/52 pinout, SMBG78AHE3/52 application, or SMBG78AHE3/52 equivalent, key selection criteria include clamping performance under 4.8 A surge, AEC-Q101 qualification for automotive use, RoHS compliance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional shunt protector, conducting only when reverse voltage exceeds VBR to clamp transients while maintaining low leakage (<1.0 μA at 78 V). Its glass-passivated junction ensures stable breakdown and fast response time (<1 ns), critical for protecting MOSFET gates and IC inputs against ESD and inductive switching spikes.
Thermal design relies on RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), with maximum junction temperature rated at +150 °C. The device is qualified per AEC-Q101 and meets MSL Level 1 (260 °C reflow peak), supporting automotive under-hood and infotainment system deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail operating margin. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Ensures reliable turn-on across process variation; guarantees clamping activation above nominal system voltage. |
| VC @ IPPM | 126 V at 4.8 A - Limits protected circuit voltage during worst-case 10/1000 μs surge; enables downstream component voltage rating selection. |
| PPPM | 600 W - Peak transient energy absorption capability; supports repetitive 0.01% duty cycle surges without degradation. |
| IFSM | 100 A - Single half-sine surge rating (8.3 ms); validates robustness against high-energy load dump events in automotive systems. |
| TJ max | +150 °C - Enables operation in under-hood environments; requires thermal pad layout per datasheet fig. 2 derating curve. |
| AEC-Q101 | Qualified - Confirmed reliability for automotive electronics per stress test requirements including HTGB, HTRB, and TCT. |
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 | Current return path during clamping | Connected to system ground or low-side reference; must handle full surge current without trace fusing. |
| Cathode | Protected line input terminal | Connected to line being protected (e.g., 78 V supply rail); band marking identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables protection against ISO 7637-2 Pulse 1/2a/5a transients in 12 V automotive systems without derating. |
| AEC-Q101 qualification | Validates long-term reliability under temperature cycling, humidity, and bias stress for automotive ECUs and ADAS modules. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic interfaces. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning risk. |
| Glass passivated junction | Ensures stable VBR and low leakage over lifetime; prevents parametric shift in harsh industrial environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 78 V auxiliary power rail in vehicle body control module against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between rail and chassis ground, clamping within nanoseconds to limit voltage to ≤126 V. Use Value: Prevents damage to downstream DC-DC converters and microcontrollers rated for ≤130 V absolute maximum, meeting ISO 16750-2 requirements. | Use Scenario: Safeguarding analog output line of a 4–20 mA industrial pressure sensor exposed to field wiring inductive kick. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode tied to signal line, anode to ground) limits transient excursions on 24 V loop-powered interface. Use Value: Maintains sensor accuracy by limiting common-mode surge-induced offset shift; clamping at 126 V avoids saturation of op-amp front-end stages. |
| Telecom DC Power Input Protection | Automotive Infotainment Display Power |
Use Scenario: Securing -48 V telecom rectifier output against lightning-induced surges entering central office equipment. IC Role / Device Role / Timing Role: Unidirectional TVS connected cathode-to-rail, anode-to-ground to clamp negative-going transients on negative supply rail. Use Value: Withstands 600 W pulses without failure, enabling compliance with ITU-T K.20/21 immunity standards for Class B equipment. | Use Scenario: Shielding 12 V backlight supply of TFT display in automotive head unit from battery reversal and alternator ripple. IC Role / Device Role / Timing Role: TVS placed at display connector input, clamping positive transients before they reach LED driver ICs. Use Value: AEC-Q101 qualification ensures zero infant mortality in thermal cycling; 126 V clamping protects 16 V-rated LED drivers from overvoltage stress. |
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), but lower PPPM = 600 W (same), higher VC = 127 V at 4.8 A; SMB (DO-214AA) package, 1.0 mm taller. | Compatible for board-level replacement where height clearance allows; identical electrical specs but different thermal profile due to larger pad area requirement. | Select SMBJ78A-E3/52 if existing PCB uses SMB footprint and thermal management accommodates RθJA = 110 °C/W. |
| SMCJ78A-E3/52 | Same VWM/VBR, but PPPM = 1500 W, VC = 127 V at 12.3 A; SMC (DO-214AB) package, 2× footprint area. | Used where higher surge immunity is required (e.g., CAN bus power, engine control); not drop-in due to larger land pattern and height. | Choose SMCJ78A-E3/52 only when system-level testing confirms need for >600 W surge handling and PCB layout permits SMC footprint. |
Compared with SMBG78AHE3/52, SMBJ78A-E3/52 offers identical clamping performance in a slightly taller package with marginally worse thermal resistance, while SMCJ78A-E3/52 delivers 2.5× peak power handling at the cost of board space and weight-making SMBG78AHE3/52 optimal for space-constrained AEC-Q101-compliant designs needing precise 600 W protection.
Availability
SMBG78AHE3/52 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal conditioning, and telecom DC power input protection requiring stable component supply, AEC-Q101 validation, and RoHS-compliant manufacturing.
Supply support for SMBG78AHE3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and automotive-grade qualification.
The SMBG series was developed specifically for high-reliability surface-mount transient suppression in automotive and industrial environments, balancing compact size, AEC-Q101 compliance, and repeatable clamping performance across temperature and life cycle.
FAQ
What is the clamping voltage of SMBG78AHE3/52 at its rated peak pulse current?
The SMBG78AHE3/52 has a maximum clamping voltage (VC) of 126 V at 4.8 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during surge events. The SMBG78AHE3/52 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) when mounted per recommended pad layout.
Is SMBG78AHE3/52 suitable for automotive applications?
Yes, SMBG78AHE3/52 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood and infotainment systems. Its construction includes glass-passivated junction, matte tin-plated leads compliant with J-STD-002, and MSL Level 1 rating for 260 °C reflow. The SMBG78AHE3/52 also meets UL 497B recognition (QVGQ2) for surge protectors, supporting compliance with ISO 16750-2 and ISO 7637-2 test requirements in vehicle ECUs.
What does the 'HE3' suffix indicate in SMBG78AHE3/52?
The 'HE3' suffix in SMBG78AHE3/52 denotes RoHS-compliant, AEC-Q101-qualified industrial grade packaging. Specifically, 'H' indicates AEC-Q101 qualification, 'E3' signifies RoHS compliance and matte tin plating, and '/52' specifies 7" diameter tape-and-reel packaging with 750 units per reel. This distinguishes it from non-automotive variants like SMBG78A-E3/52 (industrial only) or SMBG78AHM3/52 (halogen-free + AEC-Q101).
How does SMBG78AHE3/52 differ from bidirectional TVS diodes like SMBG78CA?
SMBG78AHE3/52 is unidirectional and conducts only in reverse bias above VBR, making it suitable for DC rail protection with defined polarity. In contrast, SMBG78CA is bidirectional, symmetrically clamping both polarities-used for AC lines or data buses like RS-485. The SMBG78AHE3/52 has a cathode band marking; SMBG78CA has no polarity marking. Electrical parameters (VWM, VBR, VC) are identical in magnitude but apply to both directions for the CA version.
What is the thermal resistance of SMBG78AHE3/52, and how does it affect layout?
The SMBG78AHE3/52 has typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain reliability at full 600 W surge rating, PCB layout must replicate this pad area and use internal ground planes. Derating is required above 25 °C ambient per Fig. 2 in datasheet 88456; the SMBG78AHE3/52's thermal performance directly impacts sustained surge repetition rate.
SMBG78AHE3/52 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG78AHE3/52 FAQ
1.How can I place an order for SMBG78AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG78AHE3/52 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 SMBG78AHE3/52 reliable?
The price and inventory of SMBG78AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG78AHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBG78AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG78AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG78AHE3/52?
SMBG78AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG78AHE3/52 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 SMBG78AHE3/52?
For technical support, including SMBG78AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG78AHE3/52 requirements.
6.How does Aetrix verify that SMBG78AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG78AHE3/52 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 SMBG78AHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBG78AHE3/52?
All SMBG78AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG78AHE3/52, 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 SMBG78AHE3/52 part is unused and in its original packaging.
Return procedure for SMBG78AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG78AHE3/52 Tags
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