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Vishay General Semiconductor - Diodes Division SMBJ78CAHE3_B/I
- Part No.:
- SMBJ78CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CAHE3_B/I.pdf
- Description:
- 600W,78V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,530
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Product details
Overview
SMBJ78CAHE3_B/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the 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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMBJ78CAHE3_B/I datasheet, SMBJ78CAHE3_B/I pinout, SMBJ78CAHE3_B/I application, or SMBJ78CAHE3_B/I equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, low clamping ratio, and automotive-grade reliability are required - especially in DC power rails, CAN bus interfaces, and I/O port protection circuits.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while its low incremental surge resistance enables effective energy diversion during transient events.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its response time is sub-nanosecond, and it meets MSL Level 1 per J-STD-020 with peak reflow temperature up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC operating margin. |
| VBR min / max | 86.7 V / 95.8 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on under surge conditions. |
| VC @ IPPM | 126 V at 4.8 A - Clamping voltage during 10/1000 µs surge; determines protected circuit's peak stress level. |
| PPPM | 600 W - Peak pulse power handling capability; defines transient energy absorption capacity. |
| ID @ VWM | ≤1.0 µA - Reverse leakage current at stand-off voltage; ensures minimal standby power loss and signal integrity. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm length, 4.06 mm width, and 2.20 mm height; compatible with automated placement. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals with cathode/anode roles undefined in normal operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no fixed polarity designation. |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; forms symmetrical clamping path across protected line pair. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Handles high-energy transients such as ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensors. |
| MSL Level 1, 260 °C peak reflow | Supports lead-free SMT assembly without moisture sensitivity limitations or baking requirements. |
| Glass-passivated junction | Ensures long-term stability of VBR and low parametric drift over temperature and lifetime. |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed across VCC and GND to clamp ±100 V transients within microseconds. Use Value: Limits rail voltage to ≤126 V during 4.8 A surge, preventing damage to 3.3 V/5 V regulators and microcontrollers. |
Use Scenario: Shielding high-speed CAN H/L differential pair from ESD and coupled noise in vehicle networks. IC Role / Device Role / Timing Role: TVS connected between CAN_H and CAN_L to suppress common-mode surges without affecting signal integrity. Use Value: Clamps differential transients while maintaining <1.0 µA leakage at 78 V, preserving bus bias and timing margins. |
| Industrial Sensor Interface Protection | DC Power Input Surge Guard |
|
Use Scenario: Safeguarding analog outputs (4–20 mA, 0–10 V) of pressure/temperature transmitters exposed to field wiring surges. IC Role / Device Role / Timing Role: Placed across output and ground to absorb induced lightning-induced transients on long cable runs. Use Value: Withstands repetitive 600 W pulses and maintains ≤126 V clamping, protecting precision op-amps and ADC front-ends. |
Use Scenario: Front-end protection for 24 V industrial PLC power inputs subjected to switching transients and EFT bursts. IC Role / Device Role / Timing Role: Connected line-to-ground to divert surge energy before reaching downstream DC/DC converters. Use Value: Delivers 600 W pulse rating and 150 °C operation, enabling reliable protection in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CAHM3_B/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free compliance is mandated by OEM or environmental policy. | Direct material substitution where halogen content must be minimized without altering circuit design. |
| SMAJ78CAHE3_A/H | Lower 400 W PPPM rating, SMA package (smaller footprint, higher RθJA = 140 °C/W), same VWM/VBR/VC. | Reduced surge handling and thermal performance; suitable only for lower-energy transients or space-constrained layouts. | Choose only if board area is critical and surge threat level is below ISO 7637-2 Level III; verify thermal derating. |
Compared with SMBJ78CAHE3_B/I, the HM3 variant offers identical protection performance with halogen-free construction, while the SMAJ78CAHE3_A/H trades 33 % lower pulse power and inferior thermal dissipation for smaller PCB area - requiring careful system-level surge risk reassessment.
Availability
SMBJ78CAHE3_B/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, and CAN network nodes requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMBJ78CAHE3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMBJ series targets high-energy transient suppression in harsh environments, with design focus on automotive power systems, industrial automation, and telecom infrastructure where robustness and repeatable clamping are critical.
FAQ
What does the "CA" suffix mean in SMBJ78CAHE3_B/I?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ78CAHE3_B/I provides symmetrical clamping for both positive and negative transients across its terminals. Unlike unidirectional variants (e.g., SMBJ78A), it has no cathode band marking and functions identically regardless of voltage polarity applied, making it ideal for AC-coupled or floating signal lines like CAN bus or differential sensors.
Is SMBJ78CAHE3_B/I AEC-Q101 qualified?
Yes, SMBJ78CAHE3_B/I is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering code structure ("HE3" suffix) and documentation (page 3, Ordering Information note 1). This qualification validates its reliability for automotive applications including engine control, body electronics, and ADAS subsystems under temperature cycling, humidity, and mechanical stress testing per the AEC standard.
What is the clamping voltage of SMBJ78CAHE3_B/I at its rated surge current?
The maximum clamping voltage (VC) of SMBJ78CAHE3_B/I is 126 V at 4.8 A peak pulse current (IPPM), measured under the standardized 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a surge event and is critical for ensuring downstream components remain within their absolute maximum ratings.
Can SMBJ78CAHE3_B/I replace a unidirectional TVS like SMBJ78AHE3_B/I?
No - SMBJ78CAHE3_B/I cannot directly replace SMBJ78AHE3_B/I in circuits requiring unidirectional clamping, such as DC power rail protection with defined polarity. The CA variant lacks polarity marking and conducts in both directions, which may cause unintended conduction or grounding issues in unidirectional topologies. Use only where bidirectional symmetry is required and verified in the schematic.
What is the thermal resistance of SMBJ78CAHE3_B/I, and how does it affect layout?
SMBJ78CAHE3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe operation near its 150 °C TJ limit during repeated surges, PCB layout must provide adequate copper area and avoid thermal bottlenecks - especially important in automotive and industrial applications with elevated ambient temperatures.
SMBJ78CAHE3_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:
- -
- 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:
- 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)
SMBJ78CAHE3_B/I FAQ
1.How can I place an order for SMBJ78CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CAHE3_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 SMBJ78CAHE3_B/I reliable?
The price and inventory of SMBJ78CAHE3_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 SMBJ78CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ78CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CAHE3_B/I?
SMBJ78CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CAHE3_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 SMBJ78CAHE3_B/I?
For technical support, including SMBJ78CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CAHE3_B/I requirements.
6.How does Aetrix verify that SMBJ78CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ78CAHE3_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 SMBJ78CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ78CAHE3_B/I?
All SMBJ78CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CAHE3_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 SMBJ78CAHE3_B/I part is unused and in its original packaging.
Return procedure for SMBJ78CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CAHE3_B/I Tags
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