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Diodes Incorporated 3.0SMCJ78AQ-13
- Part No.:
- 3.0SMCJ78AQ-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3.0SMCJ78AQ-13.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,436
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Product details
Overview
3.0SMCJ78AQ-13 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power rails and signal lines. It features a 78 V reverse standoff voltage, 126 V maximum clamping voltage at 23.8 A peak pulse current, and 3000 W peak pulse power dissipation per 10/1000 µs waveform. Used in automotive infotainment power inputs to suppress load dump and ISO 7637-2 transients.
For engineers reviewing the 3.0SMCJ78AQ-13 datasheet, 3.0SMCJ78AQ-13 pinout, 3.0SMCJ78AQ-13 application, or 3.0SMCJ78AQ-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, IEC 61000-4-2 ESD robustness (30 kV air/30 kV contact), AEC-Q200 qualification status, and SMC package thermal performance under sustained surge duty cycles.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with breakdown occurring at 86.7 V (min) to 95.8 V (max) when tested at 1.0 mA. Its glass-passivated junction ensures stable leakage (<5 µA at VRWM) and repeatable clamping behavior over temperature (-55°C to +150°C).
The device complies with AEC-Q200 stress testing requirements for passive components and is manufactured in IATF 16949-certified facilities. It delivers 3000 W peak pulse power handling per 10×1000 µs waveform while maintaining low dynamic impedance-critical for limiting voltage overshoot during fast-rising transients like EFT (IEC 61000-4-4) and surge (IEC 61000-4-5).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 3000 W - sustains 10/1000 µs surges without failure, enabling protection of 24 V/48 V automotive and industrial power buses. |
| Reverse Standoff Voltage (VRWM) | 78 V - maximum continuous DC or RMS voltage the device blocks before entering avalanche conduction. |
| Clamping Voltage (VC @ IPP) | 126 V @ 23.8 A - limits transient voltage seen by downstream circuitry; critical for ensuring protected ICs remain below absolute max ratings. |
| Breakdown Voltage (VBR) | 86.7–95.8 V @ 1.0 mA - defines onset of avalanche clamping; tight tolerance supports predictable protection threshold design. |
| ESD Rating | 30 kV air / 30 kV contact per IEC 61000-4-2 - eliminates need for additional ESD diodes on exposed connectors. |
| Operating Temperature | -55°C to +150°C - qualified for under-hood automotive environments and industrial control cabinets. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic body with UL 94V-0 flammability rating; terminals are matte tin-plated for solderability per MIL-STD-202, Method 208. Bi-directional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Bi-directional terminals conduct surge current equally in either direction; no cathode band marking required. |
| Case (body) | Thermal interface | SMC package bottom surface transfers heat to PCB copper; requires ≥8 mm² 0.013 mm thick copper land for rated 3000 W pulse handling. |
Key Features
| Feature | Design Value |
|---|---|
| 3000 W peak pulse power | Enables single-device protection against severe ISO 7637-2 Pulse 5a (load dump) transients on 24 V systems without derating. |
| IEC 61000-4-2 ESD immunity | 30 kV air/30 kV contact rating eliminates external ESD diodes on USB, CAN, or sensor interfaces. |
| AEC-Q200 qualification | Validated for automotive applications requiring change control, PPAP, and IATF 16949 manufacturing traceability. |
| Glass-passivated die | Ensures long-term stability of clamping voltage and leakage current under thermal cycling and humidity exposure. |
Applications
| Automotive Power Input Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protecting 24 V supply rail of head unit against load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Bi-directional TVS clamps positive and negative voltage excursions above ±126 V within nanoseconds. Use Value: Prevents damage to DC/DC converters and microcontrollers by limiting input voltage to safe levels during 120 V, 400 ms transients. |
Use Scenario: Shielding 4–20 mA current loop analog inputs from field-induced surges in factory automation. IC Role / Device Role / Timing Role: Fast-response TVS shunts induced common-mode transients before they reach precision ADC front-end. Use Value: Maintains signal integrity and prevents latch-up in instrumentation amplifiers by clamping <100 ns after surge onset. |
| Telecom PoE Port Protection | Medical Equipment ESD Interface Protection |
Use Scenario: Safeguarding IEEE 802.3af/at Power over Ethernet (PoE) data pairs from lightning-induced surges. IC Role / Device Role / Timing Role: Bi-directional clamping element placed across differential pair to suppress mode-common transients. Use Value: Enables compliance with IEC 61000-4-5 Level 4 (4 kV line-earth) without compromising 100BASE-TX signal integrity. |
Use Scenario: ESD hardening of USB and RS-232 ports on patient monitors and diagnostic devices. IC Role / Device Role / Timing Role: Primary ESD clamp on connector-facing traces, absorbing 30 kV HBM-equivalent discharges. Use Value: Meets IEC 61000-4-2 Level 4 immunity without adding capacitance that degrades signal rise time or causes bit errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78A | Lower peak power (600 W), same VRWM (78 V), higher clamping (127 V), SMB package. | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a. | Select only for space-constrained designs where surge energy is <10% of 3.0SMCJ78AQ-13 capability. |
| SMCJ78A | Same 3000 W rating and SMC package, but non-automotive grade (no AEC-Q200, no PPAP support). | Acceptable for commercial/industrial use; lacks automotive change control and traceability. | Choose when AEC-Q200 compliance and IATF 16949 sourcing are not required. |
Compared with SMBJ78A and SMCJ78A, the 3.0SMCJ78AQ-13 uniquely combines AEC-Q200 qualification, full 3000 W surge capacity, and bi-directional symmetry-making it the only option qualified for automotive power rail protection with production traceability and PPAP readiness.
Availability
3.0SMCJ78AQ-13 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial programmable logic controllers, telecom PoE injectors, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.
Supply support for 3.0SMCJ78AQ-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability protection, power management, and signal integrity solutions.
The 3.0SMCJ series belongs to Diodes' AEC-Q200-qualified TVS portfolio, engineered specifically for automotive and industrial environments demanding robust transient immunity, long-term parametric stability, and full manufacturing traceability.
FAQ
What does the 'Q' suffix in 3.0SMCJ78AQ-13 signify?
The 'Q' suffix indicates full AEC-Q200 qualification, including stress testing for temperature cycling, humidity bias, mechanical shock, and vibration. It confirms manufacturing in IATF 16949-certified facilities with PPAP documentation support and controlled change management-required for automotive Tier 1 suppliers.
How does 3.0SMCJ78AQ-13 differ from standard 3.0SMCJ78A?
The 'Q' version adds AEC-Q200 qualification, extended temperature validation (-55°C to +150°C), enhanced process controls, lot-level traceability, and PPAP documentation. Electrically identical, but only the Q-grade meets automotive OEM requirements for reliability and supply chain governance.
Can this TVS be used in unidirectional configurations?
No-it is inherently bi-directional with symmetrical breakdown characteristics. For unidirectional protection (e.g., DC rail with defined polarity), use the 'A' suffix variant (e.g., 3.0SMCJ78A), which includes a cathode band and clamps only in reverse bias.
What PCB layout practices maximize its 3000 W surge capability?
To achieve rated 3000 W performance, use ≥8 mm² copper land area per pad (0.013 mm thick), minimize trace inductance with short direct paths to ground planes, and avoid thermal vias under the device body that reduce effective thermal mass during transient events.
3.0SMCJ78AQ-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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
3.0SMCJ78AQ-13 FAQ
1.How can I place an order for 3.0SMCJ78AQ-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 3.0SMCJ78AQ-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 3.0SMCJ78AQ-13 reliable?
The price and inventory of 3.0SMCJ78AQ-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3.0SMCJ78AQ-13 is usually 5 days.
3.What payment methods are accepted for 3.0SMCJ78AQ-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3.0SMCJ78AQ-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3.0SMCJ78AQ-13?
3.0SMCJ78AQ-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3.0SMCJ78AQ-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 3.0SMCJ78AQ-13?
For technical support, including 3.0SMCJ78AQ-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3.0SMCJ78AQ-13 requirements.
6.How does Aetrix verify that 3.0SMCJ78AQ-13 is sourced from the original manufacturer or authorized distributors?
All 3.0SMCJ78AQ-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 3.0SMCJ78AQ-13 meets industry standards.
7.What is the process for return or replacement of 3.0SMCJ78AQ-13?
All 3.0SMCJ78AQ-13 units undergo pre-shipment inspection (PSI). If there is an issue with 3.0SMCJ78AQ-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 3.0SMCJ78AQ-13 part is unused and in its original packaging.
Return procedure for 3.0SMCJ78AQ-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3.0SMCJ78AQ-13 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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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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