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Vishay General Semiconductor - Diodes Division SMBJ78CAHE3_A/I
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- Part No.:
- SMBJ78CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CAHE3_A/I.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,432
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Product details
Overview
SMBJ78CAHE3_A/I 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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform). It protects MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment against ESD and inductive switching surges.
For engineers reviewing the SMBJ78CAHE3_A/I datasheet, SMBJ78CAHE3_A/I pinout, SMBJ78CAHE3_A/I application, or SMBJ78CAHE3_A/I equivalent, this device is selected for robust bidirectional surge protection where precise clamping, AEC-Q101 qualification, and low-profile SMB packaging are required in automotive-grade power rail and interface line designs.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (86.7 V / 95.8 V), VC = 126 V at IPPM = 4.8 A, and ID ≤ 1.0 µA at VWM = 78 V. Its junction-to-lead thermal resistance is 20 °C/W, enabling effective heat dissipation during transient events without external heatsinking under standard PCB pad layout.
The device meets MSL Level 1 per J-STD-020, supports 260 °C lead-free reflow, and is AEC-Q101 qualified - confirmed by HE3 suffix and ordering code "SMBJ78CAHE3_A/I". Its glass-passivated junction ensures stable leakage 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 clamping begins; defines safe operating margin for 72–80 V DC rails. |
| VBR (min/max) | 86.7 V / 95.8 V at IT = 1 mA - Confirmed breakdown range ensures consistent turn-on behavior across production lots. |
| VC @ IPPM | 126 V at 4.8 A (10/1000 µs) - Clamping voltage limits downstream component stress to ≤126 V during worst-case surge. |
| PPPM | 600 W - Peak pulse power handling capability with industry-standard 10/1000 µs waveform; validated for repetitive 0.01% duty cycle. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage preserves system power integrity in battery-powered or high-impedance sensing circuits. |
| TJ max. | +150 °C - Maximum junction temperature rating enables operation in under-hood automotive and industrial ambient environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow processes. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical anode/cathode terminals. Mounting uses 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity event) | Conducts surge current when voltage falls below −VBR; forms symmetrical clamping path with cathode. |
| Cathode | Transient current entry (positive polarity event) | Conducts surge current when voltage exceeds +VBR; enables bidirectional protection without external circuit inversion. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns or external diode pairing. |
| AEC-Q101 qualification | Validated for automotive powertrain and body electronics applications requiring extended temperature cycling and surge endurance. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV) surge events on 50 Ω source impedance when properly laid out on PCB. |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs/ICs. |
| MSL Level 1, 260 °C reflow | Supports standard lead-free SMT assembly without moisture sensitivity limitations or baking requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs and lighting modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and ground to clamp positive/negative transients within 1 ns response time. Use Value: Limits voltage excursions to ≤126 V during 100 V/100 ms load dump pulses, preventing regulator failure and MCU brownout. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) and digital I/O (CAN, LIN) from ESD and field-induced noise. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF at 0 V) bidirectional clamp on differential or single-ended sensor interfaces. Use Value: Maintains signal integrity while suppressing ±15 kV contact ESD (IEC 61000-4-2) without distorting low-bandwidth sensor waveforms. |
| Telecom Interface Protection | Consumer Device USB/Power Port Protection |
Use Scenario: Safeguarding Ethernet PHYs, DSL line drivers, and PoE injectors against lightning-induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side DC bias lines and data pair common-mode paths. Use Value: Absorbs 600 W surge energy per line pair while holding clamped voltage below IC absolute maximum ratings (e.g., <130 V). |
Use Scenario: Hardening USB-C VBUS and accessory detection pins against hot-plug transients and charger misinsertion. IC Role / Device Role / Timing Role: Secondary-stage TVS after fuse or polyfuse, directly at connector to limit let-through energy to downstream PMICs. Use Value: Withstands repeated 10/1000 µs surges up to 4.8 A without degradation, extending product lifecycle in high-turnover consumer devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ78CA | Same VWM (78 V), slightly higher VC (127 V), lower PPPM (400 W), non-AEC-Q101 rated. | Approved for commercial/industrial use only; not qualified for automotive under-hood deployment. | Select when AEC-Q101 compliance is unnecessary and cost optimization is prioritized over automotive qualification. |
| ON Semiconductor SMLJ78CA | Identical VWM (78 V), same VC (126 V), same PPPM (600 W), AEC-Q101 qualified, but in larger SMC (DO-214AB) package. | Requires larger PCB area (7.11 mm × 6.22 mm vs. SMB's 5.59 mm × 4.06 mm); higher thermal mass slows response by ~0.1 ns. | Choose when higher surge repetition tolerance or legacy SMC footprint compatibility is needed over space-constrained layouts. |
Compared with SMBJ78CAHE3_A/I, SMAJ78CA trades automotive qualification for lower cost and smaller size, while SMLJ78CA retains full electrical equivalence but increases board area by 75% - making SMBJ78CAHE3_A/I optimal for space-limited AEC-Q101 designs.
Availability
SMBJ78CAHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom line cards, and consumer USB power delivery systems requiring stable component supply with AEC-Q101 assurance and tight clamping performance.
Supply support for SMBJ78CAHE3_A/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, and protection devices with emphasis on reliability, precision, and automotive-grade validation.
The SMBJ series targets high-reliability transient suppression in space-constrained, thermally demanding environments - engineered specifically for automotive, industrial, and telecom infrastructure where clamping accuracy and qualification rigor are non-negotiable.
FAQ
What does the "CA" suffix indicate in SMBJ78CAHE3_A/I?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ78CAHE3_A/I provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBJ78A), it has no polarity marking and conducts equally in either direction above its breakdown threshold, making it ideal for AC-coupled or floating signal paths.
Is SMBJ78CAHE3_A/I suitable for protecting CAN bus lines?
Yes, SMBJ78CAHE3_A/I is commonly used for CAN FD and classical CAN bus protection due to its 78 V stand-off voltage - well above typical CAN common-mode range (±40 V) - and 126 V clamping level that stays below most transceiver absolute maximum ratings. Its bidirectional nature matches the differential signaling architecture, and its 100 pF junction capacitance minimizes signal edge distortion at 5 Mbps rates.
How does the HE3 suffix affect SMBJ78CAHE3_A/I's qualification status?
The HE3 suffix explicitly confirms that SMBJ78CAHE3_A/I is RoHS-compliant and AEC-Q101 qualified - verified per Vishay's internal qualification report and documented in the ordering information table. This distinguishes it from base-E3 (commercial grade only) and HM3 (halogen-free + AEC-Q101) variants, ensuring suitability for automotive under-hood and chassis applications.
What is the maximum recommended PCB pad size for SMBJ78CAHE3_A/I to achieve rated PPPM?
To achieve the full 600 W peak pulse power rating, Vishay specifies mounting SMBJ78CAHE3_A/I on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - as defined in Figure 2 of document 88392. Smaller pads reduce thermal dissipation and derate IPPM; using 2 oz. copper with thermal vias further improves sustained surge handling beyond single-pulse specs.
Does SMBJ78CAHE3_A/I require a series current-limiting resistor in typical applications?
No, SMBJ78CAHE3_A/I is designed for direct shunt connection between protected line and ground (or rail), without a series resistor. Its low dynamic impedance (<0.5 Ω) and sub-nanosecond response ensure effective clamping before downstream components experience overvoltage. A series resistor is only added if intentional current limiting is needed for fault isolation - which would reduce clamping effectiveness and is not part of standard SMBJ78CAHE3_A/I implementation.
SMBJ78CAHE3_A/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:
- Obsolete
- 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_A/I FAQ
1.How can I place an order for SMBJ78CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CAHE3_A/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_A/I reliable?
The price and inventory of SMBJ78CAHE3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ78CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CAHE3_A/I?
SMBJ78CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CAHE3_A/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_A/I?
For technical support, including SMBJ78CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CAHE3_A/I requirements.
6.How does Aetrix verify that SMBJ78CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ78CAHE3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ78CAHE3_A/I?
All SMBJ78CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CAHE3_A/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_A/I part is unused and in its original packaging.
Return procedure for SMBJ78CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CAHE3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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