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Vishay General Semiconductor - Diodes Division SMBJ78AHE3_B/I
- Part No.:
- SMBJ78AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78AHE3_B/I.pdf
- Description:
- 600W,78V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,715
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Product details
Overview
SMBJ78AHE3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. 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 rating with 10/1000 µs waveform - deployed in automotive power supply inputs, industrial sensor interfaces, and telecom line protection.
For engineers reviewing the SMBJ78AHE3_B/I datasheet, SMBJ78AHE3_B/I pinout, SMBJ78AHE3_B/I application, or SMBJ78AHE3_B/I equivalent, this part delivers AEC-Q101 qualified surge immunity, low incremental surge resistance, and fast sub-nanosecond response time - critical for protecting MOSFET gate drivers, CAN transceivers, and microcontroller I/O against ESD and inductive switching transients.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 78 V), then rapidly avalanches below 126 V to divert surge energy away from downstream circuitry. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability across -55 °C to +150 °C operating range.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive load dump) when used with appropriate PCB layout - including minimum 5.0 mm × 5.0 mm copper pads per terminal to sustain 600 W pulse dissipation without thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected rail voltage. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - defines guaranteed avalanche onset window; ensures consistent turn-on across temperature and unit variation. |
| VC @ IPPM | 126 V at 4.8 A - clamping voltage during 10/1000 µs surge; determines worst-case stress on downstream ICs. |
| PPPM | 600 W - peak pulse power handling capability; enables protection against severe transients like ISO 7637-2 Pulse 5a (load dump). |
| IFSM | 100 A - non-repetitive forward surge rating (8.3 ms half-sine); supports protection of rectifier outputs or DC bus inputs. |
| TJ max. | +150 °C - maximum junction temperature; allows operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 2.20 mm lead spacing; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on one end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Low-side reference node | Connected to ground or low-voltage return path; forms current path during reverse-biased clamping event. |
| Cathode (banded end) | Protected line input | Connected to the line being protected (e.g., 78 V rail); avalanche conduction occurs from cathode to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics; supports PPAP documentation and zero-defect manufacturing requirements. |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy transients such as ISO 7637-2 Pulse 5a (load dump) without degradation, enabling single-device protection of 12 V/24 V systems. |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes voltage overshoot during clamping - critical for safeguarding 80 V-rated MOSFETs or 100 V-input DC-DC controllers. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns; eliminates pre-bake requirement in SMT assembly. |
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature; reduces parameter drift in harsh environments like industrial motor drives or outdoor telecom cabinets. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 24 V battery-fed ECUs against load dump transients up to 120 V and 100 ms duration. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between battery rail and primary DC-DC converter input. Use Value: Limits voltage seen by downstream regulator to ≤126 V, preventing latch-up or destruction of 100 V-input buck controllers. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) from ESD events and cable-induced surges in factory automation. IC Role / Device Role / Timing Role: Bidirectional-capable protection element (used here in unidirectional configuration) mounted at connector interface. Use Value: Clamps transients within 1 ns while adding <1 pF capacitance - preserving signal integrity and avoiding measurement error in precision current loops. |
| Telecom DC Power Feeds | Motor Drive Gate Driver Supply Protection |
|
Use Scenario: Securing -48 V telecom power distribution boards against lightning-induced surges entering via long feeder cables. IC Role / Device Role / Timing Role: Unidirectional TVS connected between -48 V rail and chassis ground to clamp positive-going transients. Use Value: Withstands repetitive 600 W pulses without parameter shift, supporting Telcordia GR-1089-CORE compliance for central office equipment. |
Use Scenario: Shielding isolated gate driver supplies (e.g., 15 V bias for SiC MOSFETs) from Miller-induced voltage spikes during high-dI/dt switching. IC Role / Device Role / Timing Role: Local clamping device placed adjacent to gate driver IC output to suppress ringing above 78 V threshold. Use Value: Fast response prevents false turn-on of power devices; 126 V VC ensures gate oxide remains below 130 V absolute maximum rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78AHM3_B/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU public infrastructure projects). | Choose SMBJ78AHM3_B/I when halogen-free bill-of-materials is required; otherwise SMBJ78AHE3_B/I offers standard RoHS compliance. |
| SMCJ78AHE3_A/I | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; higher thermal mass yields 1500 W PPPM rating. | Used where higher surge margin is needed (e.g., heavy-duty industrial motor controls), but requires larger PCB footprint and different pad layout. | Select SMCJ78AHE3_A/I only if 1500 W surge rating is essential and board space permits SMC package; SMBJ78AHE3_B/I remains optimal for space-constrained automotive modules. |
Compared with SMBJ78AHM3_B/I, the SMBJ78AHE3_B/I offers identical protection performance with standard RoHS compliance, while SMCJ78AHE3_A/I trades compactness for higher surge capacity - making SMBJ78AHE3_B/I the preferred choice for AEC-Q101-compliant, space-limited 24 V system protection.
Availability
SMBJ78AHE3_B/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power feed applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ78AHE3_B/I 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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-reliability transient suppression in automotive, industrial, and communications systems - delivering consistent clamping performance under extreme thermal and surge stress.
FAQ
What is the maximum clamping voltage of SMBJ78AHE3_B/I at its rated peak pulse current?
The SMBJ78AHE3_B/I has a maximum clamping voltage (VC) of 126 V at its specified peak pulse current (IPPM) of 4.8 A, measured using the standard 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during a surge event and is confirmed in the Vishay datasheet Document Number 88392, page 2. The SMBJ78AHE3_B/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMBJ78AHE3_B/I qualified for automotive applications?
Yes, SMBJ78AHE3_B/I is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet under "MECHANICAL DATA" and "ORDERING INFORMATION" sections. This qualification confirms its suitability for automotive powertrain, chassis, and body electronics where reliability under thermal cycling, mechanical shock, and high-humidity conditions is mandatory. The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified construction, making SMBJ78AHE3_B/I appropriate for PPAP-submission-ready designs.
What is the standoff voltage (VWM) and why is it critical for SMBJ78AHE3_B/I selection?
The standoff voltage (VWM) of SMBJ78AHE3_B/I is 78 V - the maximum DC or continuous reverse voltage the device can withstand without entering avalanche conduction. Selecting a VWM ≥10–15% above the nominal system voltage (e.g., 78 V for a 65 V rail) prevents leakage and false triggering while ensuring reliable clamping during actual overvoltage events. This parameter directly impacts system uptime and is verified per ANSI/IEEE C62.35 standards referenced in the datasheet.
Does SMBJ78AHE3_B/I have bidirectional capability?
No, SMBJ78AHE3_B/I is a unidirectional TVS diode, as indicated by the "A" suffix and cathode band marking. It conducts only during reverse-bias overvoltage conditions - protecting positive-going transients on a referenced rail. For bidirectional protection (e.g., AC lines or differential signals), Vishay specifies the "CA" suffix variant (e.g., SMBJ78CA). The electrical characteristics table in the datasheet lists separate rows for unidirectional ("A") and bidirectional ("CA") types, confirming SMBJ78AHE3_B/I's unidirectional functionality.
What package type does SMBJ78AHE3_B/I use and what are its mounting requirements?
SMBJ78AHE3_B/I uses the SMB (DO-214AA) surface-mount package, measuring 4.57 mm × 3.94 mm × 2.20 mm with 2.20 mm lead spacing. Per Vishay's thermal guidelines, it must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 600 W peak pulse power dissipation. The device meets MSL Level 1 and is compatible with standard lead-free reflow profiles peaking at 260 °C, eliminating moisture sensitivity concerns during assembly.
SMBJ78AHE3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ78AHE3_B/I FAQ
1.How can I place an order for SMBJ78AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78AHE3_B/I 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_B/I reliable?
The price and inventory of SMBJ78AHE3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78AHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ78AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78AHE3_B/I?
SMBJ78AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78AHE3_B/I 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_B/I?
For technical support, including SMBJ78AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78AHE3_B/I requirements.
6.How does Aetrix verify that SMBJ78AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ78AHE3_B/I 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_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ78AHE3_B/I?
All SMBJ78AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78AHE3_B/I, 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_B/I part is unused and in its original packaging.
Return procedure for SMBJ78AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78AHE3_B/I Tags
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