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Vishay General Semiconductor - Diodes Division SMBJ78AHE3_A/H
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- Part No.:
- SMBJ78AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78AHE3_A/H.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,490
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Product details
Overview
SMBJ78AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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 (IPPM), and 600 W peak pulse power capability with 10/1000 µs waveform.
For engineers reviewing the SMBJ78AHE3_A/H datasheet, SMBJ78AHE3_A/H pinout, SMBJ78AHE3_A/H application, or SMBJ78AHE3_A/H equivalent, this device is selected for robust overvoltage protection on DC power rails and signal lines in automotive ECUs, industrial motor drives, and telecom interface circuits where AEC-Q101 qualification, low clamping ratio, and fast response time (<1 ns) are critical.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent clamping performance under repetitive transients.
Thermal design relies on RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), requiring minimum 5.0 mm × 5.0 mm copper pads per terminal for rated 600 W pulse handling. The device is rated for TJ = –55 °C to +150 °C and meets MSL Level 1 (260 °C reflow peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 86.7 V / 95.8 V at IT = 1 mA - Tight breakdown window ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 126 V at 4.8 A - Clamping voltage during 10/1000 µs surge; limits downstream IC stress to ≤126 V. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 immunity. |
| ID @ VWM | 1.0 µA - Ultra-low leakage at rated stand-off; avoids parasitic loading on high-impedance sensor lines. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and enclosed industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode-banded unidirectional configuration. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to system ground or return path; forms clamping loop with cathode. |
| Cathode | Protected line input | Banded end; connects to line being protected (e.g., 78 V supply rail or signal trace). |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Handles IEC 61000-4-5 combination wave surges up to 4.8 A without degradation. |
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS power supplies. |
| Glass passivated junction | Ensures long-term VBR stability and low leakage drift across temperature and lifetime. |
| MSL Level 1 | Compatible with standard SMT reflow profiles up to 260 °C peak without preconditioning. |
| Low clamping ratio (VC/VBR ≈ 1.33) | Minimizes overvoltage overshoot during transient events, protecting 100 V-rated MOSFETs and controllers. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Control |
|---|---|
|
Use Scenario: Protecting 78 V battery-fed microcontroller power inputs in engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 78 V rail and chassis ground to shunt transients before they reach LDOs or MCU VDD pins. Use Value: Limits clamped voltage to 126 V, staying within absolute maximum rating of 130 V tolerant automotive MCUs and preventing latch-up. |
Use Scenario: Safeguarding gate drive signal lines in 78 V-rated IGBT modules used in HVAC compressors and servo amplifiers. IC Role / Device Role / Timing Role: TVS placed across isolated gate driver outputs to suppress Miller-induced voltage spikes during high dV/dt switching. Use Value: Sub-1 ns response time prevents false triggering of gate drivers; 1.0 µA leakage avoids signal distortion on high-impedance PWM paths. |
| Telecom DC Power Interface | Medical Sensor Signal Line Protection |
|
Use Scenario: Shielding 78 V PoE++ auxiliary power inputs in base station remote radio units from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary front-end TVS on DC input stage, coordinated with upstream GDT and downstream π-filter for multi-stage surge suppression. Use Value: 600 W rating sustains repeated 10/1000 µs surges per IEC 61000-4-5 Ed.3, supporting outdoor deployment in lightning-prone regions. |
Use Scenario: Guarding analog front-end inputs of patient-monitoring ECG modules powered from isolated 78 V DC-DC converters. IC Role / Device Role / Timing Role: Low-leakage unidirectional TVS on differential sensor traces to prevent ESD damage while preserving signal integrity. Use Value: 1.0 µA max reverse leakage at 78 V ensures no measurable offset or gain error in µV-level biopotential measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78AHM3_A/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free compliance is mandated by OEM environmental policy. | Direct material substitution when halogen-free bill-of-materials is required. |
| SMCJ78AHE3_A/H | Larger SMC (DO-214AB) package; same VWM/VBR/VC but higher 1500 W PPPM rating and lower RθJA (50 °C/W). | Used where higher surge energy absorption or improved thermal dissipation is needed, e.g., in high-power industrial inverters. | Choose when system-level surge testing exceeds 600 W or board layout allows larger footprint. |
Compared with SMBJ78AHE3_A/H, SMBJ78AHM3_A/H offers identical protection performance with halogen-free construction, while SMCJ78AHE3_A/H delivers 2.5× higher pulse power in a larger package-enabling extended surge endurance without changing circuit topology.
Availability
SMBJ78AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial motor drives, and telecom power interfaces requiring stable component supply, AEC-Q101 validation, and consistent 78 V clamping performance across production lots.
Supply support for SMBJ78AHE3_A/H 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 application-specific optimization.
The SMBJ series was engineered for high-reliability transient suppression in space-constrained surface-mount applications, targeting automotive, industrial, and communications systems needing robust, standardized, and qualification-ready protection components.
FAQ
What is the maximum clamping voltage of SMBJ78AHE3_A/H under a 10/1000 µs surge?
The SMBJ78AHE3_A/H has a maximum clamping voltage (VC) of 126 V when subjected to its rated peak pulse current of 4.8 A using the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ78AHE3_A/H maintains this clamping performance across its full operating temperature range.
Is SMBJ78AHE3_A/H suitable for automotive applications?
Yes, SMBJ78AHE3_A/H is AEC-Q101 qualified, as confirmed in the Vishay datasheet revision 09-Jan-2024 (document 88392), section "MECHANICAL DATA". It undergoes stress testing for temperature cycling, high-temperature reverse bias, and ESD, making it suitable for under-hood and cabin applications including engine control units and body electronics. The SMBJ78AHE3_A/H carries the HE3 suffix explicitly denoting AEC-Q101 qualification.
What does the "HE3" suffix indicate in SMBJ78AHE3_A/H?
The "HE3" suffix in SMBJ78AHE3_A/H denotes a RoHS-compliant and AEC-Q101 qualified version, per Vishay's ordering nomenclature in document 88392. "H" indicates AEC-Q101 qualification, "E3" specifies RoHS-compliant commercial grade construction. The "_A/H" revision code identifies the specific manufacturing lot and test revision level. This distinguishes SMBJ78AHE3_A/H from non-automotive variants like SMBJ78A-E3.
How does SMBJ78AHE3_A/H compare to bidirectional TVS diodes like SMBJ78CA?
SMBJ78AHE3_A/H is unidirectional and intended for DC line protection where polarity is fixed, offering lower leakage (1.0 µA vs. 10 µA for SMBJ78CA at VWM) and forward voltage drop specification (VF ≤ 3.5 V at 50 A). In contrast, SMBJ78CA provides symmetrical clamping for AC or floating signals but lacks forward conduction capability. The SMBJ78AHE3_A/H is not interchangeable with SMBJ78CA without circuit redesign due to polarity dependence.
What PCB pad layout is recommended for SMBJ78AHE3_A/H to achieve full 600 W rating?
To achieve the full 600 W peak pulse power rating, Vishay specifies mounting SMBJ78AHE3_A/H on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as stated in the "MAXIMUM RATINGS" table footnote (2). Smaller pads reduce thermal dissipation and derate pulse power; the SMBJ78AHE3_A/H thermal resistance (RθJA) assumes this minimum copper area. Use internal ground planes and thermal vias if board space permits.
SMBJ78AHE3_A/H 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:
- 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 (SMBJ)
SMBJ78AHE3_A/H FAQ
1.How can I place an order for SMBJ78AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78AHE3_A/H 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 SMBJ78AHE3_A/H reliable?
The price and inventory of SMBJ78AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ78AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78AHE3_A/H?
SMBJ78AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78AHE3_A/H 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 SMBJ78AHE3_A/H?
For technical support, including SMBJ78AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78AHE3_A/H requirements.
6.How does Aetrix verify that SMBJ78AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ78AHE3_A/H 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 SMBJ78AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ78AHE3_A/H?
All SMBJ78AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78AHE3_A/H, 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 SMBJ78AHE3_A/H part is unused and in its original packaging.
Return procedure for SMBJ78AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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