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Vishay General Semiconductor - Diodes Division SMBJ78HE3/52
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- Part No.:
- SMBJ78HE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78HE3/52.pdf
- Description:
- TVS DIODE 78VWM 139VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,580
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Product details
Overview
SMBJ78HE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in 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, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMBJ78HE3/52 datasheet, SMBJ78HE3/52 pinout, SMBJ78HE3/52 application, or SMBJ78HE3/52 equivalent, key selection criteria include its AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.33), 1.0 µA max reverse leakage at VWM, and compatibility with automated SMT assembly on standard 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds VBR; it conducts surge current to ground while limiting the protected node to ≤126 V. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive transients.
Thermal design relies on RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), requiring adequate PCB copper area for power dissipation. The device is rated for TJ = –55 °C to +150 °C 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 significant leakage; defines safe DC rail margin for 72–80 V systems. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Ensures consistent turn-on across production lot; guarantees clamping initiates above normal operating voltage. |
| VC @ IPPM | 126 V at 4.8 A - Limits transient overshoot to ≤126 V during 10/1000 µs surge; critical for safeguarding 100 V-rated MOSFETs or controllers. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| IFSM | 100 A - Non-repetitive forward surge rating (8.3 ms half-sine); enables protection against load dump events in 12/24 V automotive systems. |
| TJ max. | +150 °C - Enables operation in under-hood or industrial enclosures without derating up to ambient 125 °C with proper thermal design. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; required for engine control, ADAS, and body electronics. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VREV > VBR. |
| Anode (unbanded end) | Reference/ground return | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity standards up to 4 kV in properly designed layouts. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control units, infotainment power rails, and ADAS sensor interfaces. |
| Low clamping voltage (126 V @ 4.8 A) | Provides tighter voltage limiting than generic 78 V TVS devices, reducing stress on downstream 100 V-rated components. |
| MSL Level 1, 260 °C reflow compatible | Supports single-pass lead-free reflow without preconditioning; eliminates moisture sensitivity handling overhead. |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage (<1 µA) over temperature and lifetime, critical for high-reliability systems. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs in engine control modules from ISO 7637-2 load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC-DC input, absorbing 100 A surges within microseconds. Use Value: Prevents damage to upstream PMICs and microcontrollers by limiting voltage to ≤126 V during 12 V system load dump events. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation I/O modules from ESD and switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at connector interface, shunting fast transients before reaching ADC front-end. Use Value: Maintains signal integrity with <1 µA leakage at 78 V, avoiding DC offset errors in precision 16-bit sensor measurements. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Protection |
Use Scenario: Safeguarding 48 V PoE-powered equipment inputs against lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary clamping device on DC input stage, coordinated with upstream MOVs and series impedance. Use Value: Delivers 600 W pulse handling with 126 V clamping to protect secondary-side DC-DC converters and Ethernet PHYs. |
Use Scenario: Protecting high-side gate drivers in BLDC motor inverters from Miller-induced voltage spikes during switching. IC Role / Device Role / Timing Role: Fast-response TVS mounted directly at gate driver output, clamping dv/dt-induced overshoot on gate nodes. Use Value: Prevents false turn-on and gate oxide stress with sub-nanosecond response and 126 V clamping ceiling. |
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 | Commercial-grade version; lacks AEC-Q101 qualification and has higher VBR tolerance (±10% vs ±5% for HE3). | Approved for industrial/commercial use only; not suitable for automotive OEM or Tier-1 designs requiring automotive qualification. | Select SMBJ78A-E3/52 only for cost-sensitive non-automotive applications where AEC-Q101 is not mandated. |
| SMCJ78AHE3_A/H | Higher-power SMC (DO-214AB) package; same VWM/VBR but 1500 W PPPM, 10.5 A IPPM, and larger footprint. | Used where higher surge margin is needed (e.g., outdoor telecom cabinets), but requires PCB redesign due to larger package. | Choose SMCJ78AHE3_A/H only when 600 W is insufficient and layout allows SMC footprint; otherwise retain SMBJ78HE3/52 for space-constrained designs. |
Compared with SMBJ78A-E3/52, SMBJ78HE3/52 provides automotive-grade reliability and tighter VBR control; compared with SMCJ78AHE3_A/H, it offers identical electrical performance in a 30% smaller SMB footprint - making it optimal for compact, AEC-Q101-compliant 24–48 V power rail protection.
Availability
SMBJ78HE3/52 is available at Aetrix Electronics and suitable for automotive ECU power rails, industrial sensor interfaces, telecom 48 V inputs, and motor drive gate protection requiring stable component supply and full traceability.
Supply support for SMBJ78HE3/52 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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in space-constrained, high-reliability environments - particularly targeting automotive, industrial, and telecom power and signal line protection.
FAQ
What is the clamping voltage of SMBJ78HE3/52 and how is it measured?
The SMBJ78HE3/52 has a maximum clamping voltage (VC) of 126 V, measured at a peak pulse current (IPPM) of 4.8 A using a 10/1000 µs waveform. This value is guaranteed across temperature and production lot, and reflects the actual voltage seen by protected circuitry during a standardized surge event - critical for verifying compatibility with downstream component voltage ratings in designs using SMBJ78HE3/52.
Is SMBJ78HE3/52 suitable for automotive applications?
Yes, SMBJ78HE3/52 is AEC-Q101 qualified and specifically intended for automotive use. Its HE3 suffix denotes RoHS-compliant, AEC-Q101-qualified construction, validated for temperature cycling, high-temperature reverse bias, and mechanical shock - making it appropriate for engine control, body electronics, and ADAS subsystems where SMBJ78HE3/52 is deployed in production vehicles.
What is the difference between SMBJ78HE3/52 and SMBJ78A-E3/52?
SMBJ78HE3/52 is AEC-Q101 qualified with tighter VBR tolerance (±5%) and automotive-grade process controls, while SMBJ78A-E3/52 is commercial-grade with ±10% VBR and no automotive qualification. Both share identical SMB package, VWM = 78 V, and PPPM = 600 W, but only SMBJ78HE3/52 meets automotive reliability requirements - a key distinction when selecting SMBJ78HE3/52 for Tier-1 designs.
What PCB layout guidance applies to SMBJ78HE3/52 for optimal surge performance?
For optimal surge performance, mount SMBJ78HE3/52 with minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, connected via short, wide traces to low-impedance ground. Avoid vias in the current path; use solid inner-layer ground planes. Thermal relief is discouraged - direct copper connection maximizes heat dissipation and maintains RθJA = 100 °C/W, ensuring SMBJ78HE3/52 delivers full 600 W pulse capability.
Does SMBJ78HE3/52 have polarity markings, and how is it oriented in-circuit?
Yes, SMBJ78HE3/52 is unidirectional and marked with a cathode band at one end. During installation, the banded end (cathode) connects to the line being protected (e.g., 24 V rail), while the unbanded end (anode) connects to ground. Correct orientation is essential: reverse placement renders SMBJ78HE3/52 ineffective for overvoltage protection and may cause catastrophic failure under surge conditions.
SMBJ78HE3/52 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:
- 139V
- Current - Peak Pulse (10/1000µs):
- 4.3A
- 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)
SMBJ78HE3/52 FAQ
1.How can I place an order for SMBJ78HE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78HE3/52 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 SMBJ78HE3/52 reliable?
The price and inventory of SMBJ78HE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78HE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ78HE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78HE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78HE3/52?
SMBJ78HE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78HE3/52 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 SMBJ78HE3/52?
For technical support, including SMBJ78HE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78HE3/52 requirements.
6.How does Aetrix verify that SMBJ78HE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ78HE3/52 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 SMBJ78HE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ78HE3/52?
All SMBJ78HE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78HE3/52, 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 SMBJ78HE3/52 part is unused and in its original packaging.
Return procedure for SMBJ78HE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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