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Diodes Incorporated 3.0SMCJ78CA-13
- Part No.:
- 3.0SMCJ78CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3.0SMCJ78CA-13.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,387
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Product details
Overview
3.0SMCJ78CA-13 from Diodes Incorporated is a bi-directional 3000W surface-mount transient voltage suppressor (TVS) designed for robust overvoltage protection in DC power rails and signal lines. It features a 78V reverse standoff voltage (VRWM), 126V maximum clamping voltage (VC) at 23.8A peak pulse current, and IEC-61000-4-2 ESD immunity of 30kV (air/contact). It is used in industrial power supplies and automotive infotainment interfaces to safeguard downstream ICs against lightning-induced surges and ESD events.
For engineers reviewing the 3.0SMCJ78CA-13 datasheet, 3.0SMCJ78CA-13 pinout, 3.0SMCJ78CA-13 application, or 3.0SMCJ78CA-13 equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, peak pulse current capability under 10/1000μs waveform, bi-directional symmetry for AC-coupled lines, and SMC package thermal performance on 8mm² copper land.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds its breakdown threshold (86.7–95.8V), it avalanches into low-impedance conduction to divert surge energy away from sensitive circuitry. Its glass-passivated die ensures stable leakage and repeatable clamping behavior across temperature.
The device complies with IEC-61000-4-2 Level 4 (30kV air/30kV contact) and supports HBM (8kV), CDM (1kV), and MM (800V) ESD standards. Its bi-directional configuration eliminates polarity concerns in AC or differential signal paths, and its 150°C junction rating enables operation in high-ambient environments like engine control units.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 3000W - sustains 10/1000μs transients up to 23.8A without failure |
| Reverse Standoff Voltage (VRWM) | 78V - maximum continuous DC or RMS voltage before significant leakage |
| Clamping Voltage (VC) | 126V @ 23.8A - limits voltage seen by protected IC during worst-case surge |
| Breakdown Voltage (VBR) | 86.7–95.8V @ 1mA - defines precise avalanche onset window for predictable triggering |
| ESD Rating | 30kV air / 30kV contact per IEC-61000-4-2 - meets industrial and automotive ESD immunity requirements |
| Operating Temperature | −55°C to +150°C - qualified for under-hood and industrial control cabinet deployment |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic body with UL 94V-0 flammability rating; moisture sensitivity level 1 per J-STD-020; weight ≈0.21g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bi-directional) | Connects to system ground or low-side reference; symmetric with cathode for AC line protection |
| Cathode | Transient return path (bi-directional) | Identical electrical role to anode; no polarity marking required for bi-directional variant |
Key Features
| Feature | Design Value |
|---|---|
| 3000W peak pulse power | Enables protection against high-energy lightning surges (IEC 61000-4-5) on 24V/48V industrial buses |
| Bi-directional architecture | Eliminates orientation errors during SMT placement and supports differential signal lines (e.g., RS-485, CAN) |
| Glass-passivated die | Ensures stable leakage (<5µA @ VRWM) and repeatable clamping over 1000+ surge cycles |
| RoHS-compliant & halogen-free | Fulfills IPC-1752A environmental compliance for automotive and medical OEM programs |
Applications
| Industrial Power Supply Input | Automotive Infotainment Interface |
|---|---|
Use Scenario: 24V DC input rail of PLC I/O module exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt clamping element placed upstream of DC-DC converter input to limit transient voltage to <130V. Use Value: Clamps 126V at 23.8A, providing 12V margin below typical 24V converter absolute max rating (138V), preventing input stage failure. |
Use Scenario: USB 2.0 data lines in vehicle head unit subjected to ESD events during connector mating. IC Role / Device Role / Timing Role: Bi-directional TVS placed differential across D+/D− to clamp ±30kV ESD without rectification distortion. Use Value: Symmetric clamping preserves signal integrity during high-speed data transmission while meeting ISO 10605 30kV requirements. |
| RS-485 Communication Bus | Smart Meter AC Mains Interface |
Use Scenario: Termination point of long-haul RS-485 trunk line in utility substation, vulnerable to induced lightning surges. IC Role / Device Role / Timing Role: Paired bi-directional TVS devices on A/B lines referenced to ground, absorbing common-mode transients. Use Value: 3000W rating handles multi-kA induced surges; 126V clamping protects transceiver ICs rated for 130V abs max. |
Use Scenario: Voltage monitoring input of smart electricity meter connected directly to 230VAC mains via resistive divider. IC Role / Device Role / Timing Role: Primary overvoltage clamp on divider output node, limiting transient spikes to microcontroller ADC input. Use Value: 78V VRWM allows safe operation at 230VAC-derived DC bias (~325V peak), while 126V VC prevents ADC saturation during surge events. |
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-13 (Diodes Inc.) | Lower peak power (600W), same VRWM/VC, SMB package (smaller footprint, lower thermal mass) | Suitable only for lower-energy transients (e.g., board-level ESD); not for lightning or load dump | Select when space-constrained and surge threat level is limited to IEC 61000-4-2 only |
| 1.5SMC78CA (ON Semiconductor) | Same 3000W rating and 78V VRWM, but higher clamping voltage (135V) and wider VBR tolerance (86–102V) | Reduces design margin for 130V-rated ICs; requires verification of protected device's abs max rating | Acceptable where clamping margin >135V is available or where second-source qualification is mandated |
Compared with SMBJ78CA-13, the 3.0SMCJ78CA-13 delivers 5× higher surge energy handling for infrastructure-grade protection; versus 1.5SMC78CA, it offers tighter clamping (126V vs. 135V) and superior VBR consistency, improving predictability in safety-critical designs.
Availability
3.0SMCJ78CA-13 is available at Aetrix Electronics and suitable for industrial power supply inputs, automotive infotainment interfaces, RS-485 communication buses, and smart meter AC mains interfaces requiring stable component supply across extended product lifecycles.
Supply support for 3.0SMCJ78CA-13 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and quality systems aligned with AEC-Q200.
The 3.0SMCJ series belongs to Diodes' high-power TVS portfolio, engineered specifically for industrial and automotive applications demanding robust, standardized surge immunity per IEC 61000-4-5 and ISO 7637-2.
FAQ
What is the maximum clamping voltage of the 3.0SMCJ78CA-13 under standard test conditions?
The maximum clamping voltage (VC) is 126V at 23.8A peak pulse current, measured using the standardized 10×1000μs waveform per Figure 2 of DS30818. This value is guaranteed across the full operating temperature range (−55°C to +150°C) and defines the upper voltage limit imposed on protected circuitry during surge events.
Is the 3.0SMCJ78CA-13 suitable for protecting CAN bus lines?
Yes - its bi-directional configuration, 30kV IEC-61000-4-2 ESD rating, and low clamping voltage make it appropriate for CAN FD and classical CAN physical layer protection. It must be placed differential across CANH/CANL with proper PCB layout (short traces, ground plane) to maintain signal integrity and meet ISO 11898-2 EMC requirements.
How does the SMC package of the 3.0SMCJ78CA-13 compare thermally to SMB or SOD-123 packages?
The SMC package provides significantly higher thermal mass and power dissipation capability than SMB or SOD-123: its 8.00mm² copper land requirement supports sustained 3000W pulse handling, whereas SMB is rated for ≤600W. This makes SMC essential for high-energy transients like lightning surges, where smaller packages would fail catastrophically.
Does the 3.0SMCJ78CA-13 require derating at elevated ambient temperatures?
Yes - per Figure 1 in DS30818, peak pulse power must be linearly derated above +25°C ambient: at +85°C, only ~70% of rated 3000W is permissible; at +125°C, ~40% remains. Designers must apply this derating when sizing for worst-case enclosure temperatures in industrial or automotive environments.
3.0SMCJ78CA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AB, SMC
- Series:
- 3.0SMCJ
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
3.0SMCJ78CA-13 FAQ
1.How can I place an order for 3.0SMCJ78CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 3.0SMCJ78CA-13 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 3.0SMCJ78CA-13 reliable?
The price and inventory of 3.0SMCJ78CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3.0SMCJ78CA-13 is usually 5 days.
3.What payment methods are accepted for 3.0SMCJ78CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3.0SMCJ78CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3.0SMCJ78CA-13?
3.0SMCJ78CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3.0SMCJ78CA-13 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 3.0SMCJ78CA-13?
For technical support, including 3.0SMCJ78CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3.0SMCJ78CA-13 requirements.
6.How does Aetrix verify that 3.0SMCJ78CA-13 is sourced from the original manufacturer or authorized distributors?
All 3.0SMCJ78CA-13 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 3.0SMCJ78CA-13 meets industry standards.
7.What is the process for return or replacement of 3.0SMCJ78CA-13?
All 3.0SMCJ78CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with 3.0SMCJ78CA-13, 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 3.0SMCJ78CA-13 part is unused and in its original packaging.
Return procedure for 3.0SMCJ78CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3.0SMCJ78CA-13 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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