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Vishay General Semiconductor - Diodes Division SMCJ78CAHE3_A/H
- Part No.:
- SMCJ78CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78CAHE3_A/H.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,691
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Product details
Overview
SMCJ78CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 78 V standoff voltage (VWM), 1500 W peak pulse power (PPPM), and 126 V maximum clamping voltage (VC) at 11.9 A IPPM. It protects sensitive ICs, MOSFETs, and sensor signal lines against inductive switching transients and lightning-induced surges in automotive and industrial power electronics.
For engineers reviewing the SMCJ78CAHE3_A/H datasheet, SMCJ78CAHE3_A/H pinout, SMCJ78CAHE3_A/H application, or SMCJ78CAHE3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, 1500 W surge capability under 10/1000 μs waveform, low thermal resistance (RθJL = 15 °C/W), and RoHS-compliant matte tin-plated leads suitable for automated SMT assembly.
Technical Context
This device operates as a voltage-clamping protector: when transient voltage exceeds its breakdown range (86.7–95.8 V at IT = 1 mA), it avalanches to limit downstream voltage to ≤126 V. Its bidirectional structure enables symmetrical clamping in AC-coupled or floating signal paths without polarity concerns.
Designed for high-reliability environments, SMCJ78CAHE3_A/H features glass-passivated junctions, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and is qualified to AEC-Q101 for automotive use - confirmed by HE3 suffix and Vishay's official ordering code documentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 78 V - maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin below breakdown |
| VBR (Breakdown Voltage) | 86.7–95.8 V at 1 mA - guaranteed avalanche onset range; ensures predictable turn-on during overvoltage events |
| VC (Clamping Voltage) | 126 V at IPPM = 11.9 A - peak voltage seen by protected circuit during 10/1000 μs surge; critical for IC voltage tolerance matching |
| PPPM (Peak Pulse Power) | 1500 W - energy-handling capacity under standard 10/1000 μs waveform; supports robust protection in 12–48 V systems |
| ID (Reverse Leakage) | 1.0 μA max at VWM - minimal standby current; avoids loading of high-impedance sensor or reference circuits |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive or industrial enclosures |
| RθJL | 15 °C/W - low junction-to-lead thermal resistance; improves surge survivability by enabling rapid heat transfer to PCB copper |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case meeting UL 94 V-0; dimensions 7.11 mm × 6.22 mm × 2.62 mm; matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; reverse-biased during clamping | One side of symmetrical bidirectional junction; no polarity marking on device body |
| Cathode | Current exit terminal in forward bias; reverse-biased during clamping | Other side of symmetrical bidirectional junction; identical electrical behavior to Anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions - eliminates need for polarity-aware layout in AC or differential signal protection |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD - required for engine control, ADAS, and infotainment modules |
| Low incremental surge resistance | Enables tighter VC vs. IPPM relationship - reduces voltage overshoot during fast-rising transients like ISO 7637-2 pulse 1/2a |
| MSL Level 1 rating | Supports single-reflow assembly at 260 °C peak - compatible with standard lead-free SMT processes without moisture sensitivity handling |
| Glass passivated junction | Enhances long-term stability and leakage performance across temperature and humidity stress - critical for 15-year automotive service life |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
|
Use Scenario: Protection of 24 V CAN bus power rails and LIN transceiver supplies against load dump and alternator ripple. IC Role / Device Role: Primary clamping element placed between power rail and ground, shunting surge energy away from downstream regulators and communication ICs. Use Value: Withstands 1500 W pulses and clamps to ≤126 V, ensuring compliance with ISO 16750-2 load dump test requirements for Class III vehicles. |
Use Scenario: Guarding analog outputs of pressure/temperature sensors in PLC I/O modules exposed to motor drive noise. IC Role / Device Role: Bidirectional TVS placed across differential sensor output pair (e.g., 4–20 mA loop or RS-485 bus) to suppress common-mode transients. Use Value: Symmetrical clamping prevents signal inversion or latch-up during ±1 kV EFT bursts; 1.0 μA leakage preserves measurement accuracy. |
| Telecom DC Power Feeds | Consumer Appliance Motor Controls |
|
Use Scenario: Input-side surge suppression on 48 V PoE-powered equipment (e.g., IP cameras, wireless access points). IC Role / Device Role: First-line defense against lightning-induced surges entering via Ethernet cable, mounted upstream of DC-DC converter input. Use Value: 126 V clamping voltage provides sufficient margin above 57 V PoE+ maximum, preventing damage to primary-side FETs and controller ICs. |
Use Scenario: Protecting microcontroller GPIOs and gate drivers in washing machine motor inverters subjected to brush-commutator arcing. IC Role / Device Role: Localized TVS on low-voltage control signals (e.g., PWM enable, fault feedback) routed near high-dV/dt motor phases. Use Value: Fast response time and low RθJL ensure reliable clamping of sub-100 ns spikes without thermal runaway, extending MCU lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC78CA | Same VWM (78 V) and PPPM (1500 W), but SOD-123FL package (smaller footprint, lower surge current rating: IPPM = 9.5 A) | Limited to lower-energy transients; unsuitable for load dump where >11 A surge current occurs | Choose SAC78CA only for space-constrained consumer designs with verified <10 A surge exposure. |
| SMCJ78CAHM3_A/H | Identical electrical specs and AEC-Q101 qualification; differs only in halogen-free molding compound (HM3 vs HE3) | No functional difference; HM3 required only where halogen-free compliance is mandated by OEM spec or regional regulation | Select SMCJ78CAHM3_A/H if RoHS + halogen-free certification (e.g., IEC 61249-2-21) is contractually required. |
Compared with SAC78CA, SMCJ78CAHE3_A/H delivers higher surge current handling (11.9 A vs. 9.5 A) and superior thermal dissipation (RθJL = 15 °C/W), making it preferred for automotive and industrial 24–48 V systems; versus SMCJ78CAHM3_A/H, it offers identical protection performance with standard RoHS-compliant packaging.
Availability
SMCJ78CAHE3_A/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface, telecom DC feeds, and consumer appliance motor control requiring stable component supply and AEC-Q101 assurance.
Supply support for SMCJ78CAHE3_A/H 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 SMCJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom infrastructure where sustained surge immunity and long-term parametric stability are mandatory.
FAQ
What does the "CA" suffix indicate in SMCJ78CAHE3_A/H?
The "CA" suffix denotes a bidirectional configuration: SMCJ78CAHE3_A/H clamps symmetrically in both polarities, unlike unidirectional variants (e.g., SMCJ78A). This enables use on AC-coupled lines, differential buses, or floating grounds without polarity constraints - confirmed in Vishay's datasheet section "DEVICES FOR BIDIRECTION APPLICATIONS" and electrical characteristics table.
Is SMCJ78CAHE3_A/H qualified for automotive applications?
Yes, SMCJ78CAHE3_A/H is AEC-Q101 qualified, as explicitly stated in the datasheet's "MECHANICAL DATA" section and ordering information table. The "HE3" suffix indicates RoHS-compliant and AEC-Q101 qualified construction, validated for temperature cycling, highly accelerated life testing, and ESD robustness per automotive reliability standards.
What is the maximum clamping voltage of SMCJ78CAHE3_A/H at rated surge current?
The maximum clamping voltage (VC) of SMCJ78CAHE3_A/H is 126 V at IPPM = 11.9 A under the standard 10/1000 μs waveform - directly specified in the "ELECTRICAL CHARACTERISTICS" table for SMCJ78A/CA devices. This value defines the worst-case voltage imposed on protected circuitry during full-rated surge events.
How does the SMC (DO-214AB) package of SMCJ78CAHE3_A/H support thermal performance?
The SMC (DO-214AB) package of SMCJ78CAHE3_A/H achieves RθJL = 15 °C/W (junction-to-lead), enabling efficient heat transfer to PCB copper pads. Its 8.0 mm × 8.0 mm recommended pad layout and low thermal resistance allow sustained surge dissipation without exceeding TJ max = +150 °C - critical for repeated transient events in automotive ECUs.
Can SMCJ78CAHE3_A/H replace unidirectional SMCJ78A in existing designs?
No - SMCJ78CAHE3_A/H is bidirectional and lacks polarity marking, while SMCJ78A is unidirectional with cathode band identification. Substituting without circuit review risks incorrect orientation and failure to clamp in forward-biased conditions. Designers must verify signal path symmetry and grounding topology before replacement; the datasheet explicitly separates unidirectional and bidirectional device tables and applications.
SMCJ78CAHE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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):
- 11.9A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SMCJ78CAHE3_A/H FAQ
1.How can I place an order for SMCJ78CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78CAHE3_A/H 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 SMCJ78CAHE3_A/H reliable?
The price and inventory of SMCJ78CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ78CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78CAHE3_A/H?
SMCJ78CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78CAHE3_A/H 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 SMCJ78CAHE3_A/H?
For technical support, including SMCJ78CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78CAHE3_A/H requirements.
6.How does Aetrix verify that SMCJ78CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ78CAHE3_A/H 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 SMCJ78CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ78CAHE3_A/H?
All SMCJ78CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78CAHE3_A/H, 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 SMCJ78CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMCJ78CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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