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Diodes Incorporated P6SMAJ78ADF-13
- Part No.:
- P6SMAJ78ADF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- 2-SMD, Flat Leads
- Datasheet:
-
P6SMAJ78ADF-13.pdf
- Description:
- TVS DIODE 78VWM 126VC D-FLAT
- Quantity:
- Payment:
- Shipping:
Inventory:6,424
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Product details
Overview
P6SMAJ78ADF-13 from Diodes Incorporated is a 600W surface-mount transient voltage suppressor (TVS) diode designed for unidirectional overvoltage protection in DC power rails and signal lines. It features a reverse standoff voltage of 78.0 V, breakdown voltage range of 86.7–99.7 V at 1.0 mA test current, clamping voltage of 126.0 V at 4.7 A peak pulse current, and D-FLAT package for space-constrained PCB layouts.
For engineers reviewing the P6SMAJ78ADF-13 datasheet, P6SMAJ78ADF-13 pinout, P6SMAJ78ADF-13 application, or P6SMAJ78ADF-13 equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, peak pulse current capability under IEC 61000-4-5 surge conditions, thermal resistance in actual board layout, and RoHS/Green compliance for industrial and automotive end equipment.
Technical Context
This unidirectional TVS diode operates as a shunt-clamping device that remains high-impedance below VRWM (78.0 V) and rapidly transitions to low-impedance conduction above VBR (min 86.7 V) to limit transient energy. Its glass-passivated junction ensures stable leakage (<1.0 µA at VRWM) and repeatable breakdown behavior across temperature.
The 600W peak pulse power rating is defined per 10 × 1000 µs waveform (IEC 61000-4-5 compliant), with fast response time (<1.0 ns) enabling protection of sensitive downstream components such as microcontrollers, CAN transceivers, and sensor interfaces against ESD and lightning-induced surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W - Sustains single 10×1000 µs transients up to this level without failure |
| Reverse Standoff Voltage (VRWM) | 78.0 V - Maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 86.7–99.7 V @ 1.0 mA - Confirmed avalanche initiation window for reliable clamping onset |
| Clamping Voltage (VC) | 126.0 V @ 4.7 A - Maximum voltage seen by protected circuit during specified surge event |
| Peak Pulse Current (IPP) | 4.7 A - Peak current handled at VC; defines surge immunity level per IEC 61000-4-5 |
| Thermal Resistance (RθJA) | 92 °C/W - Measured on 0.4" × 0.5" FR-4 pad; critical for derating at elevated ambient temperatures |
| Leakage Current (IR) | <1.0 µA @ 78.0 V - Ensures minimal standby power loss and no false triggering |
Pinout & Package
Package: D-FLAT - Low-profile surface-mount package (4.65 mm × 2.80 mm × 1.10 mm max) with exposed cathode terminal for thermal and electrical performance optimization. Cathode band denotes polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Transient Energy Sink | Connected to protected line; conducts surge current to ground when clamped |
| 2 (Anode) | Reference / Ground Return | Typically tied to system ground; completes current path during clamping event |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Ensures long-term reliability and stable VBR drift under thermal cycling and humidity stress |
| Lead-free, halogen-free, antimony-free "Green" finish | Meets RoHS 2 (2011/65/EU) and JEDEC J-STD-020 Level 1 moisture sensitivity requirements |
| Low-profile D-FLAT package | Reduces board area by >40% vs. SMA; enables high-density routing in compact power modules |
| Fast response time <1.0 ns | Protects sub-10 ns edge-rate digital signals and high-speed interface ICs from ESD damage |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protecting 24 V DC power inputs in PLC I/O modules against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VIN and GND, clamping transients within 126 V to safeguard downstream DC-DC converters and MCU power rails. Use Value: Withstands 600 W surges while maintaining <1.0 µA leakage at 78 V, ensuring no impact on 24 V rail regulation or standby current budget. | Use Scenario: Safeguarding LIN bus transceiver supply pins against battery voltage transients during cold-crank and jump-start events. IC Role / Device Role / Timing Role: TVS connected directly to VCC pin of LIN transceiver, clamping surges before they propagate into analog front-end circuitry. Use Value: Clamps to 126 V at 4.7 A, staying well below absolute maximum ratings of common LIN ICs (typically 130–140 V), preventing latch-up or permanent damage. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Overvoltage protection on 48 V PoE-powered equipment input stages exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary shunt protector on DC input before isolation stage, absorbing IEC 61000-4-5 Level 4 (4 kV) surges. Use Value: 600 W rating and 126 V clamping enable compliance with EN 61000-4-5 without requiring series impedance or secondary protection stages. | Use Scenario: DC link surge suppression in solar string inverters where PV array open-circuit voltage can exceed 1000 V, but local DC bus segments operate at lower voltages. IC Role / Device Role / Timing Role: Protection element on auxiliary 78 V control rail powering gate drivers and sensing circuits. Use Value: Tight 86.7–99.7 V VBR window ensures precise coordination with upstream fuses and downstream 100 V-rated MOSFETs, minimizing risk of miscoordination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78A (ON Semiconductor) | Same VRWM (78 V), higher IPP (5.0 A), larger SMB package (4.6 × 3.95 mm) | Higher thermal mass allows better sustained surge handling; less suitable for ultra-dense layouts | Select when board space permits and higher IPP margin is required for repeated surge exposure |
| 1.5SMC78A (Littelfuse) | Same VRWM, identical 600 W rating, but SMC package (7.1 × 6.2 mm) and higher RθJA (~100 °C/W) | Lower power density and slower thermal recovery; suited for lower-frequency surge environments | Choose only if legacy SMC footprint compatibility is mandatory and thermal derating is acceptable |
Compared with SMBJ78A and 1.5SMC78A, P6SMAJ78ADF-13 delivers equivalent surge protection in a 30% smaller footprint and 25% lower thermal resistance than SMC, making it optimal for space- and thermally constrained industrial and automotive PCBs where D-FLAT mounting is supported.
Availability
P6SMAJ78ADF-13 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for P6SMAJ78ADF-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 for industrial, automotive, and computing markets.
The P6SMAJ series belongs to Diodes' transient voltage suppressor portfolio, engineered specifically for robust, low-leakage, surface-mount surge protection in harsh-environment applications where board space, thermal performance, and regulatory compliance are critical.
FAQ
What is the maximum operating temperature for P6SMAJ78ADF-13?
The device supports an operating junction temperature range of –55 °C to +150 °C. Its thermal resistance (RθJA = 92 °C/W on 0.4" × 0.5" FR-4) means at 75 °C ambient and 1.5 W steady-state dissipation, junction temperature reaches ~141 °C - within safe limits. Derating above 25 °C ambient follows the curve in Figure 1 of DS38930.
Is P6SMAJ78ADF-13 suitable for bidirectional surge protection?
No - it is a unidirectional TVS diode intended for DC line protection with defined polarity (cathode to protected line). For AC or bidirectional signal lines, a symmetric device like P6SMBJ78CA or a dual-diode configuration is required. Using this part on AC signals risks forward conduction and failure.
How does the D-FLAT package affect PCB layout and thermal performance?
The D-FLAT package uses a flat, low-profile leadframe with exposed cathode terminal, enabling direct copper pour connection for enhanced heat spreading. Recommended pad layout (per Diodes' package outline) uses 0.2" × 0.25" copper pads to achieve RθJA = 92 °C/W. Smaller pads increase thermal resistance and require stricter power derating.
Can P6SMAJ78ADF-13 replace older P6SMA series devices?
No - P6SMAJ78ADF-13 is not a drop-in replacement for legacy P6SMA78A due to differences in package (D-FLAT vs. DO-214AC/SMA), thermal resistance (92 vs. ~120 °C/W), and clamping performance (126 V vs. ~130 V). Layout redesign and thermal validation are required before substitution.
P6SMAJ78ADF-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 2-SMD, Flat Leads
- 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):
- 4.7A
- Power - Peak Pulse:
- 600W
- 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:
- D-Flat
P6SMAJ78ADF-13 FAQ
1.How can I place an order for P6SMAJ78ADF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMAJ78ADF-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 P6SMAJ78ADF-13 reliable?
The price and inventory of P6SMAJ78ADF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMAJ78ADF-13 is usually 5 days.
3.What payment methods are accepted for P6SMAJ78ADF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMAJ78ADF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMAJ78ADF-13?
P6SMAJ78ADF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMAJ78ADF-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 P6SMAJ78ADF-13?
For technical support, including P6SMAJ78ADF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMAJ78ADF-13 requirements.
6.How does Aetrix verify that P6SMAJ78ADF-13 is sourced from the original manufacturer or authorized distributors?
All P6SMAJ78ADF-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 P6SMAJ78ADF-13 meets industry standards.
7.What is the process for return or replacement of P6SMAJ78ADF-13?
All P6SMAJ78ADF-13 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMAJ78ADF-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 P6SMAJ78ADF-13 part is unused and in its original packaging.
Return procedure for P6SMAJ78ADF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMAJ78ADF-13 Tags
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