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Diodes Incorporated 3.0SMCJ78A-13
- Part No.:
- 3.0SMCJ78A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3.0SMCJ78A-13.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,131
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Product details
Overview
3.0SMCJ78A-13 from Diodes Incorporated is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 78V reverse standoff voltage (VRWM), 86.7V minimum breakdown voltage (VBR), 126V maximum clamping voltage (VC) at 23.8A peak pulse current (IPP), and IEC-61000-4-2 ESD immunity of 30kV (air/contact). It is used in industrial power supplies to safeguard rectifier outputs against lightning-induced surges.
For engineers reviewing the 3.0SMCJ78A-13 datasheet, 3.0SMCJ78A-13 pinout, 3.0SMCJ78A-13 application, or 3.0SMCJ78A-13 equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, peak pulse current handling under 10/1000μs waveform, thermal derating above +25°C ambient, and SMC package solderability per MIL-STD-202.
Technical Context
This TVS operates as a voltage-clamped crowbar device: under normal bias it presents <5μA leakage at 78V; when transient voltage exceeds 86.7V, it avalanches rapidly (<1ns response) to clamp the line at ≤126V. Its glass-passivated junction ensures stable breakdown characteristics across temperature (-55°C to +150°C).
The device uses a single silicon die in an SMC (DO-214AB) package with cathode band polarity marking. It is rated for non-repetitive 8.3ms half-sine surge up to 300A and complies with JEDEC high-reliability standards for industrial use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 3000W - sustains 10×1000μs transients without failure under defined thermal conditions |
| Reverse Standoff Voltage | 78V - maximum continuous DC or RMS voltage before significant leakage begins |
| Clamping Voltage | 126V @ 23.8A - limits downstream voltage during surge, defining protection margin for 100V-rated components |
| Breakdown Voltage | 86.7–95.8V @ 1mA - precise avalanche initiation range ensuring predictable turn-on behavior |
| ESD Rating | 30kV air / 30kV contact per IEC-61000-4-2 - protects against human-handling and system-level electrostatic discharge events |
| Operating Temperature | -55°C to +150°C - supports deployment in under-hood automotive modules and industrial motor drives |
Pinout & Package
Package: SMC (DO-214AB), molded plastic body with UL 94V-0 flammability rating, matte tin-plated leads, 0.21g weight. Cathode indicated by band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-side return path; defines clamping reference point |
| Cathode | Protected line terminal | Connected to line being protected (e.g., +78V rail); avalanche occurs from cathode to anode |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Ensures long-term stability of breakdown voltage and leakage current under thermal cycling and humidity stress |
| 3000W peak pulse rating | Enables robust protection against IEC 61000-4-5 Level 4 (4kV/2Ω) surge events on 48V–72V industrial buses |
| RoHS-compliant & halogen-free | Meets EU Directive 2015/863/EU with Br+Cl <1500ppm and Sb <1000ppm - suitable for green manufacturing programs |
| JEDEC high-reliability qualification | Validated per AEC-Q standards for extended life and failure mode predictability in mission-critical systems |
Applications
| Industrial Power Supply Input | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protects AC/DC converter input stage from induced lightning surges on 24V/48V distribution lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of input filter and bridge rectifier. Use Value: Limits transient voltage to ≤126V, preventing damage to 150V-rated bulk capacitors and MOSFETs. |
Use Scenario: Shields LIN bus transceiver power pins from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS connected between VBAT and ground, triggered only during positive overvoltage events. Use Value: Clamps 120V load-dump spikes within 1ns, maintaining transceiver operation below its 40V absolute maximum rating. |
| Telecom DC Feeder Line | Renewable Energy Inverter DC Link |
|
Use Scenario: Guards PoE midspan injector output against cable-induced surges in outdoor deployments. IC Role / Device Role / Timing Role: Secondary protection after gas discharge tube (GDT), providing fast-response clamping. Use Value: Reduces residual clamping voltage from GDT's ~500V to 126V, enabling safe interface with 100V-rated Ethernet PHYs. |
Use Scenario: Safeguards IGBT gate driver supply rail against switching-induced voltage spikes in solar inverters. IC Role / Device Role / Timing Role: Mounted directly at driver IC VCC pin to suppress dV/dt-induced coupling from high-side switching node. Use Value: Maintains gate driver supply within 15V tolerance window despite 200V nanosecond transients on adjacent traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78A | 2000W PPK, same VRWM and VC, but lower IPP (17.5A vs. 23.8A) | Limited to lower-energy surges (IEC 61000-4-5 Level 3); unsuitable for 4kV/2Ω tests | Select when board space constraints require SMB package and surge energy is ≤2000W |
| SMCJ78A | Identical electrical specs and SMC package; differs only in tape-and-reel packaging (no "-13" suffix) | No functional difference; identical performance and layout compatibility | Choose for legacy procurement or non-automated assembly where reel orientation is not required |
Compared with SMBJ78A, 3.0SMCJ78A-13 delivers 50% higher surge energy handling in the same footprint; versus SMCJ78A, it offers standardized 3000-piece tape-and-reel delivery optimized for SMT placement equipment.
Availability
3.0SMCJ78A-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom DC feeder lines, and renewable energy inverter DC links requiring stable component supply and full traceability.
Supply support for 3.0SMCJ78A-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 devices, with design, manufacturing, and sales operations across Asia, the Americas, and Europe.
This part belongs to Diodes' 3.0SMCJ series of high-power TVS diodes, engineered specifically for robust front-end surge protection in harsh industrial and automotive environments where reliability under repetitive transient stress is critical.
FAQ
What is the maximum clamping voltage of the 3.0SMCJ78A-13 under standard test conditions?
The maximum clamping voltage (VC) is 126V at 23.8A peak pulse current, measured using the 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.
How does the 3.0SMCJ78A-13 differ from bi-directional variants like 3.0SMCJ78CA-13?
The 3.0SMCJ78A-13 is unidirectional with a cathode band marking and conducts only during positive overvoltage events relative to ground. The "C" suffix variant is bi-directional, symmetrical, and protects both polarities-making it suitable for AC lines or differential data buses, whereas the "A" version is optimized for DC rail protection with tighter leakage control.
Can the 3.0SMCJ78A-13 be used in automotive applications?
Yes-it is qualified to JEDEC high-reliability standards and manufactured in IATF 16949-certified facilities. For AEC-Q200-compliant designs, Diodes offers the automotive-grade Q-suffix version (e.g., 3.0SMCJ78AQ-13), which includes PPAP documentation and extended temperature validation beyond the commercial part's -55°C to +150°C range.
What is the thermal derating behavior above +25°C ambient temperature?
Per Figure 1 in DS30818, the device's peak pulse power capability decreases linearly: at +85°C ambient, it retains ~75% of rated 3000W; at +125°C, ~50%; and at +150°C, ~30%. Derating applies equally to peak pulse current, requiring system-level thermal analysis to ensure adequate PCB copper area and airflow for sustained surge duty cycles.
3.0SMCJ78A-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:
- 1
- Bidirectional Channels:
- -
- 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
3.0SMCJ78A-13 FAQ
1.How can I place an order for 3.0SMCJ78A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 3.0SMCJ78A-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 3.0SMCJ78A-13 reliable?
The price and inventory of 3.0SMCJ78A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3.0SMCJ78A-13 is usually 5 days.
3.What payment methods are accepted for 3.0SMCJ78A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3.0SMCJ78A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3.0SMCJ78A-13?
3.0SMCJ78A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3.0SMCJ78A-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 3.0SMCJ78A-13?
For technical support, including 3.0SMCJ78A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3.0SMCJ78A-13 requirements.
6.How does Aetrix verify that 3.0SMCJ78A-13 is sourced from the original manufacturer or authorized distributors?
All 3.0SMCJ78A-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 3.0SMCJ78A-13 meets industry standards.
7.What is the process for return or replacement of 3.0SMCJ78A-13?
All 3.0SMCJ78A-13 units undergo pre-shipment inspection (PSI). If there is an issue with 3.0SMCJ78A-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 3.0SMCJ78A-13 part is unused and in its original packaging.
Return procedure for 3.0SMCJ78A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3.0SMCJ78A-13 Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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