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Diodes Incorporated SMCJ78AQ-13-F
- Part No.:
- SMCJ78AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78AQ-13-F.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,059
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Product details
Overview
SMCJ78AQ-13-F from Diodes Incorporated is a unidirectional 1,500W automotive transient voltage suppressor (TVS) diode with 78V reverse standoff voltage (VRWM), 126V max clamping voltage (VC) at 11.4A peak pulse current, and AEC-Q101 qualification for under-hood power line protection in ISO7637-2 Pulse 1/2a/3a/3b-compliant systems.
For engineers reviewing the SMCJ78AQ-13-F datasheet, SMCJ78AQ-13-F pinout, SMCJ78AQ-13-F application, or SMCJ78AQ-13-F equivalent, key selection criteria include clamping performance under 10/1000μs surge, bidirectional vs. unidirectional polarity, thermal derating above +25°C, and IATF 16949 manufacturing traceability for automotive BOMs.
Technical Context
This TVS diode uses glass-passivated silicon junction construction to achieve sub-nanosecond response time and stable clamping across -55°C to +150°C operating range. Its 1,500W peak pulse power rating is defined per 10×1000μs waveform with 4-pulse-per-minute duty cycle limit.
Designed for unidirectional DC rail protection, it features cathode-band polarity marking, 5.0W steady-state power dissipation at TL = +75°C, and complies with ISO10605 ESD (30kV air/contact) and ISO7637-2 transient immunity standards without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500W - sustains single 10×1000μs transients up to 11.4A without failure |
| Reverse Standoff Voltage | 78V - maximum continuous DC voltage before significant leakage (≤5μA) |
| Clamping Voltage | 126V @ IPP = 11.4A - limits downstream IC voltage during ISO7637-2 Pulse 1 (-100V) |
| Breakdown Voltage | 86.7–95.8V @ IT = 1mA - ensures reliable avalanche initiation margin above VRWM |
| Operating Temperature | -55°C to +150°C - supports engine bay placement with full electrical specs maintained |
| Package Thermal Resistance | Not specified - derived from PM(AV) = 5.0W @ TL = +75°C and JEDEC J-STD-020 Level 1 MSL |
Pinout & Package
Package: SMC (DO-214AB), molded plastic body with UL 94V-0 flammability rating, 0.21g mass, matte tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Banded End) | Anode-to-Cathode Conduction Path | Unidirectional conduction: blocks 78V reverse bias; avalanches at ≥86.7V to clamp transients |
| Anode (Non-Banded End) | Reference Terminal | Connected to protected line (e.g., 12V/24V rail); cathode tied to ground or lower potential |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive use with PPAP documentation support and IATF 16949 manufacturing control |
| Glass Passivated Die | Eliminates surface contamination sensitivity and improves long-term reliability under thermal cycling |
| ISO7637-2 Compliance | Withstands Pulse 1 (-100V), Pulse 2a (+50V), Pulse 3a (-150V), and Pulse 3b (+100V) without degradation |
| RoHS 3 & Halogen-Free | Meets EU Directive 2015/863/EU with Br+Cl <1500ppm and Sb <1000ppm for green manufacturing |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Lines |
|---|---|
Use Scenario: 12V battery feed to microcontroller power supply in gasoline/diesel ECUs exposed to load dump and alternator ripple. IC Role / Device Role: Primary overvoltage clamp on main VDD rail upstream of DC-DC converter. Use Value: Limits transient voltage to ≤126V during ISO7637-2 Pulse 1 (-100V), preventing damage to 5V/3.3V LDOs and MCU I/O. |
Use Scenario: Protection of high-speed CANH/CANL differential pair against ESD and coupled transients in vehicle door modules. IC Role / Device Role: Unidirectional TVS on each CAN line referenced to chassis ground. Use Value: Clamps ±30kV ISO10605 ESD events within 1ns while maintaining <10pF capacitance to preserve signal integrity at 1Mbps. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: 12V input protection for image sensor modules mounted near engine compartment with wide ambient temperature swings. IC Role / Device Role: First-stage transient suppression before low-noise LDO powering CMOS image sensor. Use Value: Operates continuously from -55°C to +150°C with no parameter drift, ensuring reliability in under-hood camera housings. |
Use Scenario: 24V supply rail protection for three-phase gate drivers controlling EPS brushless motors during cranking and regeneration. IC Role / Device Role: High-energy clamping device absorbing load dump surges up to 1500W peak. Use Value: Handles 200A non-repetitive forward surge (8.3ms half-sine) without bond wire fusing, enabling robust EPS operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC78-13-F (Diodes Inc.) | Lower 700W peak power; same 78V VRWM and SMC package; not AEC-Q101 qualified | Limited to non-safety-critical interior modules where ISO7637-2 Pulse 1 immunity is not required | Select when cost sensitivity outweighs full automotive qualification and 1500W surge margin |
| SMAJ78A (ON Semiconductor) | Same 78V VRWM but 400W peak power; SMA package (smaller footprint, higher thermal resistance) | Suitable only for low-energy signal lines; cannot replace SMCJ78AQ-13-F in power rail protection | Choose only for space-constrained PCBs where surge energy is limited to <400W and AEC-Q101 is optional |
Compared with SAC78-13-F and SMAJ78A, SMCJ78AQ-13-F delivers 2.5× higher surge capacity and certified automotive qualification-critical for engine bay power rails where ISO7637-2 Pulse 1 (-100V) and thermal stability exceed +125°C are mandatory.
Availability
SMCJ78AQ-13-F is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera systems, and electric power steering designs requiring stable component supply with full automotive traceability and lifecycle management.
Supply support for SMCJ78AQ-13-F 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 components for automotive, industrial, and computing markets with over 50 years of semiconductor design expertise.
This device belongs to Diodes' AEC-Q101-qualified SMCJ automotive TVS family, engineered specifically for ISO7637-2 and ISO10605 compliance in harsh-temperature vehicle power networks.
FAQ
What is the maximum clamping voltage of SMCJ78AQ-13-F at its rated peak pulse current?
The maximum clamping voltage (VC) is 126V at 11.4A peak pulse current (IPP), measured using the standardized 10×1000μs waveform per REA definition. This value ensures protected circuits remain below critical voltage thresholds during ISO7637-2 Pulse 1 and Pulse 3a transients.
Is SMCJ78AQ-13-F bidirectional or unidirectional?
SMCJ78AQ-13-F is unidirectional, indicated by the absence of "C" in the part number suffix. It features a cathode band for polarity identification and conducts only during reverse-biased avalanche, making it suitable for DC rail protection with ground-referenced clamping.
Does this TVS diode require external heat sinking in typical automotive applications?
No external heat sink is required. Its 5.0W steady-state power dissipation rating applies at lead temperature (TL) of +75°C, and thermal performance is validated within the SMC package's intrinsic capability under standard PCB copper pour conditions per JEDEC guidelines.
How does SMCJ78AQ-13-F differ from industrial-grade SMCJ78A variants?
SMCJ78AQ-13-F includes AEC-Q101 qualification, PPAP documentation support, IATF 16949 manufacturing certification, and enhanced screening for temperature cycling and humidity exposure-distinguishing it from commercial SMCJ78A parts not intended for automotive safety-critical systems.
SMCJ78AQ-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- 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):
- 11.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SMCJ78AQ-13-F FAQ
1.How can I place an order for SMCJ78AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78AQ-13-F 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 SMCJ78AQ-13-F reliable?
The price and inventory of SMCJ78AQ-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMCJ78AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78AQ-13-F?
SMCJ78AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78AQ-13-F 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 SMCJ78AQ-13-F?
For technical support, including SMCJ78AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78AQ-13-F requirements.
6.How does Aetrix verify that SMCJ78AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMCJ78AQ-13-F 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 SMCJ78AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMCJ78AQ-13-F?
All SMCJ78AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78AQ-13-F, 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 SMCJ78AQ-13-F part is unused and in its original packaging.
Return procedure for SMCJ78AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ78AQ-13-F Tags
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