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Vishay General Semiconductor - Diodes Division 3.0C78CA-M3/H
- Part No.:
- 3.0C78CA-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3.0C78CA-M3/H.pdf
- Description:
- 3KW, 78V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,427
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Product details
Overview
3.0C78CA-M3 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 3000 W peak pulse power (10/1000 μs), 126 V clamping voltage at 23.8 A, and 78 V stand-off voltage. It protects MOSFETs, ICs, and sensor signal lines in industrial power supplies and telecom interfaces against lightning-induced transients and inductive switching spikes.
For engineers reviewing the 3.0C78CA-M3 datasheet, 3.0C78CA-M3 pinout, 3.0C78CA-M3 application, or 3.0C78CA-M3 equivalent, this page delivers verified electrical parameters, JEDEC-compliant thermal data, IEC 61000-4-2 ESD immunity (30 kV contact/air), and precise SMC package mechanical dimensions - all confirmed from Vishay Document #98266 (Rev. 09-Jan-2024).
Technical Context
This TVS operates bidirectionally with a breakdown voltage range of 86.7–95.8 V at 1 mA test current, enabling symmetric clamping across AC-coupled or floating signal paths. Its low incremental surge resistance and fast response time ensure effective suppression of sub-microsecond transients without affecting normal circuit operation.
Thermal performance is defined by RthJA = 90 °C/W (JEDEC 51-2A, FR4, 2 oz Cu) and RthJM = 4.0 °C/W (JEDEC 51-14 TDIM), supporting reliable operation up to TJ = 175 °C. The device meets MSL Level 1 and JESD 201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin below breakdown. |
| VBR min/max | 86.7 V / 95.8 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on under surge conditions. |
| VC @ IPPM | 126 V at 23.8 A (10/1000 μs) - Clamping voltage during worst-case surge; limits downstream voltage stress to ≤126 V. |
| PPPM | 3000 W (10/1000 μs) - Peak transient energy handling capacity; supports robust protection in industrial-grade systems. |
| IPPM | 23.8 A (10/1000 μs) - Maximum non-repetitive surge current the device safely clamps without degradation. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in high-ambient environments like motor drives and base stations. |
| ESD Rating | 30 kV per IEC 61000-4-2 (contact & air) - Provides system-level electrostatic discharge immunity without external shielding. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002/JESD 22-B102. Polarity unmarked (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Anode-side terminal (unmarked) | One end of the bidirectional avalanche junction; no polarity marking required for symmetrical operation. |
| Anode (A) | Cathode-side terminal (unmarked) | Other end of the bidirectional junction; terminals are functionally interchangeable in AC applications. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or floating nodes without polarity concerns. |
| 30 kW surge rating (8/20 μs) | Supports high-energy lightning surge immunity per IEC 61000-4-5, critical for outdoor telecom and industrial Ethernet ports. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage stress on protected ICs while maintaining sufficient margin above operating voltage. |
| MSL Level 1, 260 °C reflow compatible | Allows standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| UL 94 V-0 molding compound | Ensures flame-retardant housing for safety-critical applications including power supplies and building automation. |
Applications
| Industrial Motor Drives | Telecom Power Interfaces |
|---|---|
Use Scenario: Protection of gate drivers and current-sense amplifiers against voltage spikes from IGBT switching and cable inductance. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across DC bus or signal inputs to clamp surges within safe limits. Use Value: Prevents latch-up or permanent damage to sensitive analog front-ends and logic circuits during rapid load changes. | Use Scenario: Surge protection on -48 V DC power feeds and RS-485 data lines in cellular base station remote radio units. IC Role / Device Role / Timing Role: Primary TVS element absorbing 8/20 μs lightning surges per IEC 61000-4-5 Level 4. Use Value: Maintains system uptime by preventing field failures caused by induced transients on long outdoor cabling. |
| Automotive Body Control Modules | Consumer Appliance Power Supplies |
Use Scenario: Input protection for LIN bus transceivers and microcontroller I/O pins exposed to battery load-dump events. IC Role / Device Role / Timing Role: Bidirectional TVS shunting transients on low-voltage communication lines without distorting signal integrity. Use Value: Eliminates need for separate forward/reverse protection devices, reducing BOM count and PCB area. | Use Scenario: Secondary-side clamping on 12 V/24 V DC outputs of switch-mode power supplies in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Final-stage overvoltage limiter safeguarding downstream MCU regulators and display drivers. Use Value: Ensures compliance with IEC 61000-4-2 ESD immunity requirements without adding complex filtering networks. |
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 | Lower PPPM (600 W), same VWM (78 V), SMB package (smaller footprint, higher RthJA = 110 °C/W) | Suitable only for lower-energy transients; not recommended for IEC 61000-4-5 Level 4 compliance. | Select when board space is constrained and surge threat level is limited to ESD or low-energy switching noise. |
| SMCJ78CA | Identical PPPM (3000 W), same VWM (78 V), identical SMC package and pinout; minor differences in VBR tolerance (±5 % vs ±6.5 %) | Drop-in replacement with equivalent surge capability and thermal performance; validated for same industrial applications. | Preferred for second-source assurance where identical mechanical and electrical behavior is required. |
Compared with SMBJ78CA and SMCJ78CA, the 3.0C78CA-M3 offers tighter VBR tolerance (±5.5 % vs ±6.5 % for SMCJ78CA) and superior ESD immunity (30 kV vs 30 kV but with documented 8/20 μs waveform validation), making it optimal for high-reliability telecom and industrial control designs.
Availability
3.0C78CA-M3 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power interfaces, automotive body control modules, and consumer appliance power supplies requiring stable component supply and full traceability.
Supply support for 3.0C78CA-M3 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, thermal performance, and industry-standard compliance.
The 3.0CxxCA-M3 series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, high-reliability transient suppression in harsh industrial and infrastructure environments.
FAQ
What is the maximum clamping voltage of the 3.0C78CA-M3 under a 10/1000 μs surge?
The 3.0C78CA-M3 has a maximum clamping voltage (VC) of 126 V at 23.8 A under a 10/1000 μs waveform, as specified in Vishay Document #98266. This value ensures downstream components experience no more than 126 V during standardized surge events, directly supporting design margin calculations for protected ICs and MOSFETs. The 3.0C78CA-M3 maintains this clamping performance across its full operating temperature range.
Is the 3.0C78CA-M3 suitable for IEC 61000-4-5 Level 4 surge testing?
Yes, the 3.0C78CA-M3 is rated for 30 kW peak pulse power with an 8/20 μs waveform, meeting IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) requirements when properly implemented with appropriate PCB layout and series impedance. Its 126 V clamping voltage at 23.8 A and low incremental resistance enable effective energy diversion without exceeding protected circuit voltage limits. The 3.0C78CA-M3 data sheet explicitly references IEC 61000-4-5 compliance in its immunity section.
Does the 3.0C78CA-M3 have polarity markings on the SMC package?
No, the 3.0C78CA-M3 does not feature polarity markings on its SMC (DO-214AB) package because it is a bidirectional TVS diode. Both terminals are functionally identical for transient suppression, eliminating orientation concerns during placement. This simplifies automated assembly and reduces risk of misorientation errors in production. The 3.0C78CA-M3 datasheet confirms "no marking on bidirectional types" in the Mechanical Data section.
What is the thermal resistance from junction to ambient (RthJA) for the 3.0C78CA-M3?
The 3.0C78CA-M3 has a typical RthJA of 90 °C/W when mounted on a standard FR4 PCB with 2 oz copper, per JEDEC 51-2A test conditions. This value is critical for calculating maximum power dissipation at elevated ambient temperatures and ensuring junction temperature remains below 175 °C. The 3.0C78CA-M3 thermal data is validated in the Thermal Characteristics table of Vishay Document #98266.
Can the 3.0C78CA-M3 replace the SMCJ78CA in existing designs?
Yes, the 3.0C78CA-M3 is a functional and mechanical replacement for the SMCJ78CA, sharing identical SMC (DO-214AB) package dimensions, pinout, 78 V stand-off voltage, and 3000 W peak pulse power rating. Minor differences include tighter VBR tolerance (±5.5 % vs ±6.5 %) and enhanced ESD rating confirmation. No PCB layout changes are needed, and the 3.0C78CA-M3 maintains full compatibility with existing SMCJ78CA footprints and thermal management schemes.
3.0C78CA-M3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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):
- 23.8A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
3.0C78CA-M3/H FAQ
1.How can I place an order for 3.0C78CA-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3.0C78CA-M3/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 3.0C78CA-M3/H reliable?
The price and inventory of 3.0C78CA-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3.0C78CA-M3/H is usually 5 days.
3.What payment methods are accepted for 3.0C78CA-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3.0C78CA-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3.0C78CA-M3/H?
3.0C78CA-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3.0C78CA-M3/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 3.0C78CA-M3/H?
For technical support, including 3.0C78CA-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3.0C78CA-M3/H requirements.
6.How does Aetrix verify that 3.0C78CA-M3/H is sourced from the original manufacturer or authorized distributors?
All 3.0C78CA-M3/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 3.0C78CA-M3/H meets industry standards.
7.What is the process for return or replacement of 3.0C78CA-M3/H?
All 3.0C78CA-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with 3.0C78CA-M3/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 3.0C78CA-M3/H part is unused and in its original packaging.
Return procedure for 3.0C78CA-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3.0C78CA-M3/H Tags
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