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Vishay General Semiconductor - Diodes Division SMCJ78CAHM3/H
- Part No.:
- SMCJ78CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78CAHM3/H.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,103
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Product details
Overview
SMCJ78CAHM3/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 clamping voltage (VC) at 11.9 A peak pulse current (IPPM). It protects sensitive ICs and MOSFETs in automotive power rails and industrial sensor interfaces.
For engineers reviewing the SMCJ78CAHM3/H datasheet, SMCJ78CAHM3/H pinout, SMCJ78CAHM3/H application, or SMCJ78CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) for reliable operation in harsh environments.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal lines without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM).
Designed for transient suppression per IEC 61000-4-5 (10/1000 μs waveform), it delivers fast response time (<1 ns), low incremental surge resistance, and 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 |
| VBR min/max | 86.7 V / 95.8 V at 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | 126 V at 11.9 A - clamped voltage during 10/1000 μs surge, limiting stress on downstream components |
| PPPM | 1500 W - peak surge energy handling capacity under standardized waveform |
| TJ max | +150 °C - maximum junction temperature enabling use in under-hood automotive environments |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, guiding PCB copper pad sizing for thermal management |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | One side of symmetrical bidirectional structure; no polarity marking required |
| Cathode | Current exit terminal in forward bias | Other side of symmetrical bidirectional structure; identical electrical role to Anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or ungrounded lines without polarity constraints |
| AEC-Q101 qualification | Validated reliability for automotive powertrain, body electronics, and ADAS modules requiring extended temperature and lifetime performance |
| Halogen-free & RoHS | Complies with environmental regulations and supports lead-free assembly processes up to 260 °C peak reflow |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage exposure during transients while maintaining margin above VWM |
| MSL Level 1 rating | Allows unlimited floor life and standard SMT handling without dry-pack or baking requirements |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-connected ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Primary clamping device placed at board-level input filter stage to shunt surge energy before DC-DC converters and microcontrollers. Use Value: Withstands 1500 W surges and clamps to 126 V, preventing damage to downstream 36 V-rated regulators and CAN transceivers. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS across signal and return lines to suppress ±15 kV contact ESD and 1 kV ring wave transients. Use Value: Symmetrical clamping ensures equal protection regardless of signal polarity; low leakage (<1.0 μA) avoids loading precision current sources. |
| Telecom Line Interface Protection | Consumer Power Adapter Input Stage |
Use Scenario: Safeguarding Ethernet PHY front-end circuitry in PoE-powered switches against lightning-induced surges on data pairs. IC Role / Device Role / Timing Role: Paired bidirectional TVS devices on differential pairs to clamp common-mode and differential-mode transients simultaneously. Use Value: 126 V clamping voltage aligns with IEEE 802.3af/bt isolation margins; DO-214AB footprint enables compact layout near RJ45 magnetics. | Use Scenario: Input-stage surge suppression in wall-mounted USB-C PD adapters exposed to mains-borne transients per IEC 61000-4-5. IC Role / Device Role / Timing Role: First-line defense after fuse and X-cap, absorbing line-to-ground surges before bridge rectifier and primary-side controller. Use Value: 1500 W PPPM rating handles 2 kV/1 kA combination wave tests; halogen-free construction meets UL/IEC safety certification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ78CA-E3/57T | Lower PPPM (400 W), smaller SMA package, higher RθJA (110 °C/W) | Suitable only for lower-energy transients; limited thermal headroom in high-ambient environments | Select when board space is constrained and surge threat level is ≤400 W |
| SMCJ78AHE3_A/H | Unidirectional version; same VWM, PPPM, and package but asymmetric clamping | Requires correct polarity orientation; unsuitable for AC or floating signal lines | Choose only for DC rail protection where polarity is fixed and reverse conduction must be blocked |
Compared with SMCJ78CAHM3/H, SMAJ78CA-E3/57T offers reduced surge robustness and thermal performance, while SMCJ78AHE3_A/H sacrifices bidirectionality for unidirectional blocking-making SMCJ78CAHM3/H the optimal choice for automotive and industrial systems demanding full-symmetry surge immunity.
Availability
SMCJ78CAHM3/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom infrastructure projects requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ78CAHM3/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 demanding environments; SMCJ78CAHM3/H specifically serves automotive-grade and industrial applications needing AEC-Q101 validation and halogen-free compliance.
FAQ
What does the 'CA' suffix indicate in SMCJ78CAHM3/H?
The 'CA' suffix in SMCJ78CAHM3/H denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both polarities. This allows it to protect AC-coupled circuits, differential signal lines, or ungrounded systems without regard to voltage polarity-unlike unidirectional variants such as SMCJ78A or SMCJ78AHE3_A/H which conduct only in reverse bias.
Is SMCJ78CAHM3/H qualified for automotive applications?
Yes, SMCJ78CAHM3/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix) and documentation. This qualification validates its reliability for automotive use cases including engine control units, body electronics, and ADAS modules operating across -55 °C to +150 °C junction temperature range with robust surge endurance.
What is the clamping voltage of SMCJ78CAHM3/H and why does it matter?
The clamping voltage (VC) of SMCJ78CAHM3/H is 126 V at 11.9 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value defines the maximum voltage imposed on protected circuitry during a surge event; staying below downstream component ratings (e.g., 150 V capacitors or 130 V MOSFETs) ensures functional integrity and prevents catastrophic failure.
How does the HM3 suffix differ from E3 or M3 in SMCJ78CAHM3/H?
The HM3 suffix in SMCJ78CAHM3/H indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification-distinguishing it from E3 (RoHS commercial grade), M3 (halogen-free RoHS commercial grade), and HE3 (RoHS + AEC-Q101 without halogen-free claim). The 'H' prefix explicitly certifies compliance with automotive environmental and reliability standards.
Can SMCJ78CAHM3/H replace SMCJ78AHE3_A/H in a design?
No-SMCJ78CAHM3/H cannot directly replace SMCJ78AHE3_A/H because it is bidirectional while SMCJ78AHE3_A/H is unidirectional. Substituting introduces risk of unintended conduction during normal forward-biased operation. If bidirectionality is not required, SMCJ78AHE3_A/H remains appropriate; if symmetry is needed, SMCJ78CAHM3/H is the correct choice.
SMCJ78CAHM3/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:
- 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):
- 11.9A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ78CAHM3/H FAQ
1.How can I place an order for SMCJ78CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78CAHM3/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 SMCJ78CAHM3/H reliable?
The price and inventory of SMCJ78CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ78CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78CAHM3/H?
SMCJ78CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78CAHM3/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 SMCJ78CAHM3/H?
For technical support, including SMCJ78CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78CAHM3/H requirements.
6.How does Aetrix verify that SMCJ78CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ78CAHM3/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 SMCJ78CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ78CAHM3/H?
All SMCJ78CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78CAHM3/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 SMCJ78CAHM3/H part is unused and in its original packaging.
Return procedure for SMCJ78CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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