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Diodes Incorporated P6SMAJ78ADF
- Part No.:
- P6SMAJ78ADF
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- 2-SMD, Flat Leads
- Datasheet:
-
P6SMAJ78ADF.pdf
- Description:
- TVS DIODE 78VWM 126VC D-FLAT
- Quantity:
- Payment:
- Shipping:
Inventory:7,575
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Product details
Overview
P6SMAJ78ADF from Diodes Incorporated is a 600W surface-mount transient voltage suppressor (TVS) diode designed for unidirectional overvoltage protection in DC power lines and signal interfaces. 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-used in industrial power supply input stages.
For engineers reviewing the P6SMAJ78ADF datasheet, P6SMAJ78ADF pinout, P6SMAJ78ADF application, or P6SMAJ78ADF equivalent, key selection criteria include clamping voltage margin relative to system rail, peak pulse current handling under IEC 61000-4-5 surge conditions, thermal resistance on FR-4 board, and RoHS-compliant green packaging compatibility with automated SMT assembly.
Technical Context
This unidirectional TVS diode operates as a shunt-clamping device triggered by reverse-biased avalanche breakdown above VRWM. Its glass-passivated die ensures stable VBR tolerance and low leakage (<1.0 µA at 78 V), while fast response time (<1.0 ns) enables suppression of ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5).
The D-FLAT package provides low thermal resistance (RθJA = 92 °C/W on 0.4" × 0.5" pad), supporting reliable power dissipation during 10/1000 µs transients. Polarity is marked by cathode band; anode connects to protected line, cathode to ground or lower-potential reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W - sustains single 10/1000 µs surges up to this level without failure |
| Reverse Standoff Voltage (VRWM) | 78.0 V - maximum continuous DC or RMS voltage before significant leakage |
| Clamping Voltage (VC) | 126.0 V at IPP = 4.7 A - peak voltage seen by protected circuit during surge |
| Breakdown Voltage (VBR) | 86.7–99.7 V @ IT = 1.0 mA - precise avalanche initiation window for predictable triggering |
| Max Reverse Leakage (IR) | 1.0 µA @ VRWM - negligible standby current impact on low-power systems |
| Thermal Resistance (RθJA) | 92 °C/W - measured on 0.4" × 0.5", 2 oz copper pad; guides heatsinking requirements |
Pinout & Package
Package: D-FLAT (surface-mount, low-profile plastic case, UL 94V-0 rated, 0.035 g weight). Cathode indicated by band; terminals are anode (pin 1) and cathode (pin 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Protected Line Input | Connected to DC rail or signal line requiring surge protection |
| Cathode (Pin 2) | Clamp Reference Node | Tied to system ground or lowest potential reference plane for shunt conduction |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Ensures long-term VBR stability and low parameter drift across temperature and life cycle |
| Lead-free, halogen- and antimony-free "Green" finish | Complies with RoHS 2 and JEDEC MSL Level 1; compatible with lead-free reflow profiles |
| Low-profile D-FLAT package | Reduces board area by >40% vs. SMA; enables high-density layout in compact power modules |
| Fast response time (<1.0 ns) | Activates before sensitive downstream ICs experience overstress during ESD events |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) Inputs |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed upstream of DC-DC converter input to limit transient voltage to <130 V. Use Value: Clamps 4.7 A surge at 126 V, maintaining safe margin below converter's absolute maximum rating of 150 V. |
Use Scenario: LIN bus line protection in door module against battery reversal and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to chassis ground, absorbing negative-going spikes on LIN data line. Use Value: 1.0 µA leakage at 78 V prevents false wake-up in sleep mode; 600 W rating handles 50 V/100 ms load dump energy. |
| Telecom DC Feeder Protection | Renewable Energy Inverter DC Link Monitoring |
Use Scenario: -48 V telecom rectifier output feeding remote radio units, subject to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC distribution bus, coordinated with secondary MOV-based protection. Use Value: 126 V clamping ensures protected equipment remains within 60 V headroom of -48 V nominal rail, meeting GR-1089-CORE immunity thresholds. |
Use Scenario: Voltage sense input of MPPT controller monitoring 800 V DC link in solar string inverter. IC Role / Device Role / Timing Role: Transient limiter on isolated analog front-end, preventing ADC saturation during grid fault transients. Use Value: 92 °C/W RθJA allows direct mounting on sense PCB without heatsink; 86.7–99.7 V VBR matches 10% overvoltage threshold of 800 V system. |
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 | Same VRWM (78 V), but SMB package (larger footprint, RθJA = 100 °C/W) | Higher thermal mass suits higher average surge duty cycles; less suitable for ultra-dense layouts | Select when board space permits and thermal budget exceeds 92 °C/W requirement |
| 1.5SMC78A | Same electrical specs, but SMC package (5.3 mm × 5.3 mm); 1500 W rating (derated to 600 W at TA > 25°C) | Higher peak power supports repetitive surges; requires larger pad layout and reflow profile adjustment | Choose for applications needing margin beyond single-event 600 W, e.g., motor drive gate driver protection |
Compared with SMBJ78A and 1.5SMC78A, P6SMAJ78ADF delivers identical clamping performance in a 40% smaller footprint and 8–15% lower thermal resistance, making it optimal for space- and thermally constrained 24–80 V DC systems where single-event surge immunity is primary.
Availability
P6SMAJ78ADF is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom DC feeders, and renewable energy inverters requiring stable component supply with full traceability and lifecycle management.
Supply support for P6SMAJ78ADF 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 and automotive markets.
P6SMAJ78ADF belongs to the P6SMAJ series of 600 W surface-mount TVS diodes, engineered specifically for robust, space-efficient overvoltage protection in harsh-environment DC power systems.
FAQ
What is the maximum operating temperature for P6SMAJ78ADF?
The P6SMAJ78ADF has an operating junction temperature range of –55 °C to +150 °C. Its thermal resistance (RθJA = 92 °C/W) means that at 600 W peak pulse power, junction temperature rise is limited to ~430 °C-but since the pulse is non-repetitive and short duration (10/1000 µs), actual ΔT is transient and self-limiting. Continuous operation relies on steady-state PM(AV) = 1.5 W at TL = +75 °C.
Is P6SMAJ78ADF bidirectional or unidirectional?
P6SMAJ78ADF is a unidirectional TVS diode, configured for reverse-biased clamping only. Its schematic shows cathode band marking, and electrical characteristics specify reverse standoff (VRWM) and breakdown (VBR) parameters-not symmetrical forward/reverse ratings. It must be oriented with cathode toward ground to protect positive rails.
How does the D-FLAT package affect soldering and reliability?
The D-FLAT package uses matte tin annealed over copper leadframe, qualified per MIL-STD-202 Method 208 for solderability. Its low profile (max height 1.10 mm) and defined pad layout reduce tombstoning risk. Moisture sensitivity is Level 1 (unlimited floor life), eliminating bake requirements prior to reflow-enhancing manufacturing yield and long-term intermetallic joint integrity.
Can P6SMAJ78ADF replace P6SMAJ75ADF in a design?
Yes, with verification of system margin: P6SMAJ78ADF has 3 V higher VRWM than P6SMAJ75ADF (78 V vs. 75 V), resulting in 3 V higher clamping voltage (126 V vs. 121 V). This increases protected circuit's voltage headroom but reduces surge margin if the downstream IC's absolute max rating is tight. Confirm that 126 V remains ≤80% of the IC's rated limit.
P6SMAJ78ADF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 2-SMD, Flat Leads
- Series:
- SMAJ
- Packaging:
- Cut Tape (CT)
- 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 FAQ
1.How can I place an order for P6SMAJ78ADF through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMAJ78ADF 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 reliable?
The price and inventory of P6SMAJ78ADF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMAJ78ADF is usually 5 days.
3.What payment methods are accepted for P6SMAJ78ADF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMAJ78ADF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMAJ78ADF?
P6SMAJ78ADF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMAJ78ADF 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?
For technical support, including P6SMAJ78ADF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMAJ78ADF requirements.
6.How does Aetrix verify that P6SMAJ78ADF is sourced from the original manufacturer or authorized distributors?
All P6SMAJ78ADF 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 meets industry standards.
7.What is the process for return or replacement of P6SMAJ78ADF?
All P6SMAJ78ADF units undergo pre-shipment inspection (PSI). If there is an issue with P6SMAJ78ADF, 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 part is unused and in its original packaging.
Return procedure for P6SMAJ78ADF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMAJ78ADF Tags
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Diodes Incorporated
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