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Vishay General Semiconductor - Diodes Division SMBJ78CAHE3/52
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- Part No.:
- SMBJ78CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CAHE3/52.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,539
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Product details
Overview
SMBJ78CAHE3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ78CAHE3/52 datasheet, SMBJ78CAHE3/52 pinout, SMBJ78CAHE3/52 application, or SMBJ78CAHE3/52 equivalent, key selection criteria include bidirectional surge clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), low leakage (<1.0 µA at VWM), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamping protector: under normal conditions it presents high impedance (>1 MΩ) up to 78 V, then rapidly transitions to low-impedance conduction when transient voltage exceeds its breakdown threshold. Its bidirectional symmetry enables protection of AC-coupled or floating signal paths without polarity constraints.
It delivers 600 W peak pulse power handling per 10/1000 µs waveform with <1 ns response time, low incremental surge resistance, and stable clamping performance across -55 °C to +150 °C junction temperature range. The glass-passivated junction ensures robust ESD immunity and long-term reliability under repetitive surge stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin for 72–80 V nominal rails. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Confirmed breakdown window ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 126 V at 4.8 A - Clamped voltage level protecting downstream components from destructive overvoltage exposure. |
| PPPM | 600 W - Peak transient energy absorption capacity using standardized 10/1000 µs surge waveform. |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss. |
| TJ max | +150 °C - Enables operation in high-temperature environments such as automotive engine bays or industrial motor drives. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (bidirectional) | Conducts surge current in either direction; connects to protected line or ground return path depending on layout. |
| Cathode | Transient current exit point (bidirectional) | Paired with Anode to form symmetrical clamping path; no cathode band marking on bidirectional variants. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance testing. |
| 600 W peak pulse power | Handles high-energy transients common in inductive load switching (e.g., solenoids, relays) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage overshoot during clamping, reducing stress on protected ICs and MOSFETs. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT reflow profiles without moisture sensitivity concerns. |
| Glass passivated junction | Enhances long-term stability and resistance to environmental contamination versus epoxy-passivated alternatives. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O against back-EMF spikes from brushed DC motors and relay coils. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across motor supply rail or between MCU GPIO and external sensors. Use Value: Limits transient voltage to ≤126 V, preventing latch-up or permanent damage to 5 V/3.3 V logic interfaces while supporting >100,000 surge cycles. |
Use Scenario: Surge suppression on LIN bus lines and power inputs of door module ECUs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary TVS device located at connector interface to shunt transients before entering AEC-Q100-compliant ASICs. Use Value: Meets ISO 7637-2 Pulse 1/2a/5a immunity requirements with verified AEC-Q101 qualification and 150 °C operational rating. |
| Telecom Power Supplies | Industrial Sensor Signal Conditioning |
|
Use Scenario: Input-stage protection for 48 V telecom rectifiers subjected to lightning-induced surges on AC mains and battery backup lines. IC Role / Device Role / Timing Role: First-line defense parallel to bulk input capacitor, clamping fast-rising transients before upstream DC/DC converters. Use Value: Withstands 600 W pulses and maintains VC ≤126 V, enabling use with 100 V-rated input capacitors and reducing need for oversized filtering. |
Use Scenario: Protection of analog front-end inputs (e.g., 4–20 mA loops, thermocouple amplifiers) in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) bidirectional clamp placed directly at connector pins to prevent ESD and cable discharge events. Use Value: Preserves signal accuracy via sub-µA leakage and fast <1 ns response, avoiding baseline shift or offset drift in precision measurement circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CA-M3/52 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated by OEM or regional regulations. | Choose SMBJ78CA-M3/52 when halogen-free bill-of-materials is required; otherwise SMBJ78CAHE3/52 offers same performance with standard RoHS compliance. |
| SMCJ78CAHE3/52 | Same VWM/VBR/VC, but in larger SMC (DO-214AB) package with 1500 W PPPM rating and lower RθJA (50 °C/W). | Used where higher surge energy handling or improved thermal dissipation is needed, e.g., main DC input rails in heavy industrial equipment. | Choose SMCJ78CAHE3/52 only if system-level surge testing requires >600 W capability or board layout allows larger footprint; SMBJ78CAHE3/52 remains optimal for space-constrained designs. |
Compared with SMBJ78CA-M3/52, SMBJ78CAHE3/52 provides identical protection performance with standard RoHS compliance, while SMCJ78CAHE3/52 trades compact SMB size for 2.5× higher pulse power and better thermal management - making SMBJ78CAHE3/52 the preferred choice for cost-sensitive, space-limited automotive and industrial control applications requiring AEC-Q101 validation.
Availability
SMBJ78CAHE3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, telecom power supplies, and sensor interface protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMBJ78CAHE3/52 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated through validated, high-reliability components.
FAQ
What does the "CA" suffix indicate in SMBJ78CAHE3/52?
The "CA" suffix denotes a bidirectional configuration, meaning SMBJ78CAHE3/52 clamps voltage transients equally in both polarities - essential for protecting AC-coupled lines, differential buses, or floating sensor inputs where polarity reversal may occur. Unlike unidirectional "A" variants, SMBJ78CAHE3/52 has no cathode marking and exhibits symmetric VBR and VC characteristics in either direction.
Is SMBJ78CAHE3/52 suitable for automotive applications?
Yes, SMBJ78CAHE3/52 is AEC-Q101 qualified, confirming its suitability for automotive electronics including body control modules, infotainment power supplies, and sensor interfaces. Its -55 °C to +150 °C operating range, MSL Level 1 reflow compatibility, and validated surge endurance meet stringent automotive reliability requirements - making SMBJ78CAHE3/52 appropriate for under-hood and cabin-mounted systems.
How does SMBJ78CAHE3/52 compare to SMAJ78CAHE3/52 in terms of surge handling?
SMBJ78CAHE3/52 delivers 600 W peak pulse power with a 10/1000 µs waveform, whereas SMAJ78CAHE3/52 is rated for only 400 W in the same test condition. This 50 % higher energy absorption makes SMBJ78CAHE3/52 more robust against severe transients like relay coil flyback or nearby lightning strikes - especially critical in industrial motor drive and telecom infrastructure applications where surge severity exceeds standard IEC 61000-4-5 levels.
What is the maximum clamping voltage of SMBJ78CAHE3/52 and why does it matter?
The maximum clamping voltage (VC) of SMBJ78CAHE3/52 is 126 V at 4.8 A peak pulse current. This value defines the highest voltage that will appear across protected circuitry during a surge event - directly determining whether downstream components (e.g., 100 V-rated MOSFETs or 130 V-capacitors) remain within safe operating limits. A lower VC relative to VBR indicates superior clamping efficiency, and SMBJ78CAHE3/52 achieves a favorable clamping ratio of ~1.35.
Can SMBJ78CAHE3/52 be used in place of a unidirectional TVS like SMBJ78AHE3/52?
No - SMBJ78CAHE3/52 is bidirectional and lacks polarity marking, while SMBJ78AHE3/52 is unidirectional with a defined cathode band. Substituting SMBJ78CAHE3/52 for SMBJ78AHE3/52 in DC-only circuits may cause unintended conduction during normal forward bias, leading to excessive leakage or thermal runaway. Always match device polarity to circuit topology: use SMBJ78CAHE3/52 only where true bidirectional clamping is required, such as AC signal lines or floating grounds.
SMBJ78CAHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ78CAHE3/52 FAQ
1.How can I place an order for SMBJ78CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CAHE3/52 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 SMBJ78CAHE3/52 reliable?
The price and inventory of SMBJ78CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ78CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CAHE3/52?
SMBJ78CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CAHE3/52 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 SMBJ78CAHE3/52?
For technical support, including SMBJ78CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CAHE3/52 requirements.
6.How does Aetrix verify that SMBJ78CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ78CAHE3/52 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 SMBJ78CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ78CAHE3/52?
All SMBJ78CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CAHE3/52, 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 SMBJ78CAHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ78CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CAHE3/52 Tags
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