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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Vishay 3.0C78CA-M3/I

Name: 3.0C78CA-M3/I
Brand: Vishay
SKU: 3.0C78CA-M3/I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 3.0C78CA-M3/I

Manufacturer:: Vishay

Category:: TVS Diodes

Package:: DO-214AB, SMC

Datasheet:: 3.0C78CA-M3/I.pdf

Description:: 3KW, 78V 5%,BIDIR,SMC TVS

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Product details

Overview

3.0C78CA-M3 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) 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 and telecom equipment against lightning and inductive switching transients.

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, SMC package mechanical data, bidirectional clamping behavior, ESD immunity (30 kV HBM), and real-world protection use cases - all aligned to Vishay Document #98266 (Rev. 09-Jan-2024).

Technical Context

This TVS diode operates as a voltage-clamped shunt protector, activating when reverse transient voltage exceeds its 86.7–95.8 V breakdown range. Its low incremental surge resistance and sub-nanosecond response time ensure rapid energy diversion before downstream components are stressed.

Rated for -55 °C to +175 °C junction temperature and compliant with IEC 61000-4-2 (30 kV contact/air discharge), it sustains repeated surges under derated conditions per JEDEC 51-2A thermal modeling on FR4 PCBs with R_thJA = 90 °C/W.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	78 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe signal line bias margin.
V_BR min/max	86.7 V / 95.8 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold.
V_C @ I_PPM	126 V - Clamps transients to ≤126 V at 23.8 A (10/1000 μs), limiting stress on protected 80–100 V-rated devices.
P_PPM	3000 W - Peak pulse power handling for 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 surge immunity.
ESD Rating	30 kV - Human Body Model (HBM) contact and air discharge immunity per IEC 61000-4-2; eliminates need for external ESD stages.
T_J max	+175 °C - Enables operation in high-temperature industrial enclosures without thermal shutdown.

Pinout & Package

Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, MSL Level 1, matte tin-plated leads solderable per J-STD-002/JESD 22-B102. Polarity not marked - bidirectional device.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (marked end)	Transient current sink during positive surge	Acts as low-impedance path to ground for positive transients; terminal identity confirmed by Vishay DO-214AB standard orientation.
Anode	Transient current sink during negative surge	Provides symmetrical clamping for negative transients; enables bidirectional protection without polarity awareness in layout.

Key Features

Feature	Design Value
Bidirectional clamping	Protects AC-coupled or floating signal lines (e.g., RS-485, CAN bus) without polarity-sensitive placement.
30 kW surge rating (8/20 μs)	Withstands 163 A peak current for lightning-induced surges per IEC 61000-4-5, exceeding typical Level 4 requirements.
Low clamping ratio (V_C/V_WM = 1.61)	Minimizes overvoltage overshoot relative to working voltage - critical for protecting 75–85 V logic interfaces.
MSL Level 1 rating	Allows unlimited floor life and reflow at 260 °C peak - compatible with standard lead-free SMT assembly processes.

Applications

Industrial Motor Drives	Telecom Power Interfaces
Use Scenario: Protecting gate drivers and current-sense amplifiers from flyback spikes during IGBT/MOSFET switching in variable-frequency drives. IC Role / Device Role / Timing Role: Shunt TVS placed across DC bus or gate resistor to clamp <100 ns transients before they propagate to control ICs. Use Value: Prevents false triggering and latch-up in isolated gate drivers by limiting transient voltage to 126 V while maintaining 78 V system operating margin.	Use Scenario: Safeguarding PoE (Power over Ethernet) injectors and splitters against lightning-induced surges on 48–57 V DC power lines. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converters and Ethernet PHYs. Use Value: Absorbs 3000 W pulses without degradation, preserving 48 V rail integrity and avoiding brownout resets in remote telecom nodes.
Automotive Body Control Modules	Consumer Sensor Signal Lines
Use Scenario: Shielding LIN bus transceivers and microcontroller I/O pins from load-dump and jump-start transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional TVS mounted directly at connector entry point to suppress both positive and negative polarity surges. Use Value: Withstands 30 kV ESD and 126 V clamping ensures compatibility with automotive-grade 3.3 V/5 V MCUs and LIN PHYs rated to 130 V abs max.	Use Scenario: Guarding analog outputs of temperature/humidity sensors in smart home hubs exposed to ESD during user handling. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 0 V) shunt protector on 0–3.3 V sensor output traces. Use Value: Adds <1.5 V overvoltage margin above 3.3 V rail while contributing negligible signal distortion due to minimal junction capacitance.

Industrial Motor Drives

Telecom Power Interfaces

Use Scenario: Protecting gate drivers and current-sense amplifiers from flyback spikes during IGBT/MOSFET switching in variable-frequency drives.

IC Role / Device Role / Timing Role: Shunt TVS placed across DC bus or gate resistor to clamp <100 ns transients before they propagate to control ICs.

Use Value: Prevents false triggering and latch-up in isolated gate drivers by limiting transient voltage to 126 V while maintaining 78 V system operating margin.

Use Scenario: Safeguarding PoE (Power over Ethernet) injectors and splitters against lightning-induced surges on 48–57 V DC power lines.

IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converters and Ethernet PHYs.

Use Value: Absorbs 3000 W pulses without degradation, preserving 48 V rail integrity and avoiding brownout resets in remote telecom nodes.

Automotive Body Control Modules

Consumer Sensor Signal Lines

Use Scenario: Shielding LIN bus transceivers and microcontroller I/O pins from load-dump and jump-start transients in 12 V vehicle subsystems.

IC Role / Device Role / Timing Role: Bidirectional TVS mounted directly at connector entry point to suppress both positive and negative polarity surges.

Use Value: Withstands 30 kV ESD and 126 V clamping ensures compatibility with automotive-grade 3.3 V/5 V MCUs and LIN PHYs rated to 130 V abs max.

Use Scenario: Guarding analog outputs of temperature/humidity sensors in smart home hubs exposed to ESD during user handling.

IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 0 V) shunt protector on 0–3.3 V sensor output traces.

Use Value: Adds <1.5 V overvoltage margin above 3.3 V rail while contributing negligible signal distortion due to minimal junction capacitance.

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	Same V_WM (78 V), lower P_PPM (600 W), SMB package (smaller footprint, higher R_thJA = 110 °C/W)	Limited to lower-energy surges; unsuitable for IEC 61000-4-5 Level 4 or 30 kV ESD environments.	Select when board space is constrained and surge threat level is limited to IEC 61000-4-4 EFT only.
1.5KE78CA	Same V_WM (78 V), through-hole DO-201 package, P_PPM = 1500 W, higher V_C = 129 V	Requires manual or wave soldering; less suitable for automated SMT lines and high-density layouts.	Choose for legacy through-hole designs or where thermal mass of axial leaded package improves long-duration surge endurance.

Compared with SMBJ78CA and 1.5KE78CA, the 3.0C78CA-M3 delivers 5× higher pulse power in an SMT package with superior thermal resistance (R_thJM = 4.0 °C/W), making it optimal for high-reliability industrial and telecom surge protection where PCB area and automated assembly are priorities.

Availability

3.0C78CA-M3 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power interfaces, automotive body control modules, and consumer sensor signal lines requiring stable component supply and full compliance with IEC 61000-4-2/4-5 standards.

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, power handling, and automotive qualification.

The 3.0CxxCA-M3 series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power, bidirectional surge suppression in harsh industrial and infrastructure environments where sustained 175 °C operation and 30 kV ESD immunity are mandatory.

FAQ

What is the breakdown voltage range of the 3.0C78CA-M3?

The 3.0C78CA-M3 has a specified breakdown voltage (V_BR) range of 86.7 V to 95.8 V at 1 mA test current, per Vishay Document #98266. This range ensures consistent turn-on behavior across production lots and allows design margining for worst-case transient suppression. The 3.0C78CA-M3 achieves reliable clamping at 126 V when subjected to its rated 23.8 A peak pulse current.

Does the 3.0C78CA-M3 support bidirectional transient protection?

Yes, the 3.0C78CA-M3 is explicitly designed as a bidirectional TVS diode, with symmetric clamping characteristics for both positive and negative polarity transients. Its unmarked SMC package and absence of polarity marking confirm bidirectional functionality, making it ideal for AC-coupled interfaces like RS-485, CAN, and differential sensor lines. The 3.0C78CA-M3 maintains identical V_C and I_PPM performance in either direction.

What is the maximum clamping voltage of the 3.0C78CA-M3 under surge conditions?

The maximum clamping voltage (V_C) of the 3.0C78CA-M3 is 126 V at 23.8 A peak pulse current with a 10/1000 μs waveform. This value is measured and guaranteed per Vishay's electrical characteristics table in Document #98266. The 3.0C78CA-M3 maintains this clamping performance across its full operating temperature range (-55 °C to +175 °C), ensuring robust protection even in thermally demanding environments.

Is the 3.0C78CA-M3 compliant with RoHS and halogen-free standards?

Yes, the 3.0C78CA-M3 carries the "-M3" suffix, which Vishay specifies as halogen-free, RoHS-compliant, and industrial grade per Document #98266. Its molding compound meets UL 94 V-0 flammability rating, and its matte tin-plated leads satisfy J-STD-002 and JESD 22-B102 solderability requirements. The 3.0C78CA-M3 also passes JESD 201 Class 2 whisker testing, confirming long-term interconnect reliability.

What is the thermal resistance specification for the 3.0C78CA-M3?

The 3.0C78CA-M3 has a junction-to-ambient thermal resistance (R_thJA) of 90 °C/W when mounted on a standard FR4 PCB per JEDEC 51-2A, and a junction-to-mount thermal resistance (R_thJM) of 4.0 °C/W per JEDEC 51-14 TDIM method. These values enable accurate thermal derating calculations for high-duty-cycle surge events. The 3.0C78CA-M3's low R_thJM supports efficient heat transfer to heatsink pads or copper planes in high-power applications.

3.0C78CA-M3/I Specifications

Product attributes: Attribute value

Manufacturer:: Vishay

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):: 23.8A

Power - Peak Pulse:: 3000W (3kW)

Power Line Protection:: No

Applications:: Telecom

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AB (SMC)

3.0C78CA-M3/I FAQ

1.How can I place an order for 3.0C78CA-M3/I through Aetrix?

Please submit a Request for Quotation (RFQ) for 3.0C78CA-M3/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 3.0C78CA-M3/I reliable?

The price and inventory of 3.0C78CA-M3/I 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/I is usually 5 days.

3.What payment methods are accepted for 3.0C78CA-M3/I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3.0C78CA-M3/I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 3.0C78CA-M3/I?

3.0C78CA-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 3.0C78CA-M3/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 3.0C78CA-M3/I?

For technical support, including 3.0C78CA-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3.0C78CA-M3/I requirements.

6.How does Aetrix verify that 3.0C78CA-M3/I is sourced from the original manufacturer or authorized distributors?

All 3.0C78CA-M3/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 3.0C78CA-M3/I meets industry standards.

7.What is the process for return or replacement of 3.0C78CA-M3/I?

All 3.0C78CA-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with 3.0C78CA-M3/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 3.0C78CA-M3/I part is unused and in its original packaging.

Return procedure for 3.0C78CA-M3/I:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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