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Diodes Incorporated P6SMAJ51ADF
- Part No.:
- P6SMAJ51ADF
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- 2-SMD, Flat Leads
- Datasheet:
-
P6SMAJ51ADF.pdf
- Description:
- TVS DIODE 51VWM 82.4VC D-FLAT
- Quantity:
- Payment:
- Shipping:
Inventory:5,056
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Product details
Overview
P6SMAJ51ADF 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 51.0 V, breakdown voltage range of 56.7–65.2 V at 1.0 mA test current, clamping voltage of 82.4 V at 7.3 A peak pulse current, and D-FLAT package for space-constrained PCB layouts-used in industrial power supplies and automotive control modules.
For engineers reviewing the P6SMAJ51ADF datasheet, P6SMAJ51ADF pinout, P6SMAJ51ADF application, or P6SMAJ51ADF equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, peak pulse current handling under IEC 61000-4-5 surge conditions, thermal resistance on standard FR-4 pads, and compatibility with automated SMT assembly due to its low-profile D-FLAT footprint.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage (<1 µA at VRWM) and repeatable clamping performance across temperature (–55°C to +150°C).
The device responds within picoseconds to transients per 10/1000 µs waveform, limiting induced voltage to ≤82.4 V during a 7.3 A surge. Thermal design relies on junction-to-terminal resistance of 57 °C/W (on 0.4" × 0.5" copper pad), enabling reliable power dissipation up to 1.5 W at TL = +75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W - sustains single 10/1000 µs surges without failure under defined board layout |
| Reverse Standoff Voltage (VRWM) | 51.0 V - maximum continuous DC voltage before significant leakage begins |
| Clamping Voltage (VC) | 82.4 V @ 7.3 A - limits transient voltage seen by downstream circuitry |
| Breakdown Voltage (VBR) | 56.7–65.2 V @ 1.0 mA - defines precise avalanche initiation window |
| Max Reverse Leakage (IR) | 1.0 µA @ VRWM - negligible standby current impact on low-power systems |
| Junction-to-Ambient RθJA | 92 °C/W - enables thermal management on compact 0.4" × 0.5" copper pad |
Pinout & Package
Package: D-FLAT (low-profile surface-mount, 2-terminal, cathode-banded). Dimensions: 4.65 mm × 2.80 mm × 1.10 mm max, with 0.2" × 0.25" recommended copper pad per Diodes Inc. layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Transient Current Sink | Connected to protected line; conducts surge current to ground when clamped |
| 2 (Anode) | Reference / Ground Return | Typically tied to system ground; completes clamping path during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Ensures long-term stability of breakdown voltage and leakage under humidity and thermal cycling |
| Lead-free, RoHS-compliant finish | Matte tin annealed over copper leadframe meets MIL-STD-202 solderability and EU Directive 2011/65/EU |
| Halogen- and antimony-free "Green" material | Contains <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - compliant with environmental manufacturing standards |
| Low-profile D-FLAT package | Height ≤1.10 mm enables use in ultra-thin electronics and high-density PCBs |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protecting gate drivers and MCU I/O against load dump and inductive switching spikes in 24 V DC motor control circuits. IC Role / Device Role: Unidirectional TVS placed between power rail and ground to clamp transients up to 600 W. Use Value: Limits voltage excursion to 82.4 V, preserving 100 V-rated MOSFETs and 5 V/3.3 V logic interfaces. | Use Scenario: Safeguarding LIN bus transceivers and sensor inputs from battery line transients during jump-start or alternator load dump. IC Role / Device Role: Standoff-rated TVS on 12 V supply rail, operating below 51 V nominal but clamping above 82 V. Use Value: Meets ISO 7637-2 Pulse 5a requirements with verified 7.3 A peak pulse capability. |
| Telecom Power Feeds | Programmable Logic Controllers |
Use Scenario: Overvoltage protection on 48 V DC power input of remote radio units exposed to lightning-induced surges. IC Role / Device Role: Primary clamping device on front-end DC/DC converter input stage. Use Value: 600 W rating supports IEC 61000-4-5 Level 4 (4 kV) surge immunity with margin. | Use Scenario: Input protection for analog sensor channels and digital I/O terminals in factory automation controllers. IC Role / Device Role: Point-of-use TVS on 24 V field wiring interface, mounted adjacent to connector. Use Value: Low 1.0 µA leakage avoids measurement drift in precision 4–20 mA loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A (Bourns) | Same 51 V VRWM, 83.5 V VC @ 7.2 A; SMB package (larger footprint, higher RθJA) | Less suitable for ultra-dense layouts; better thermal mass for repetitive surges | Select if board space allows larger package and higher steady-state power handling is needed |
| 1.5SMC51A (ON Semiconductor) | Identical electrical specs; SMC package (3.9 mm × 2.5 mm), higher RθJA (110 °C/W) | Requires larger pad area; lower surge repetition rate tolerance | Choose only when legacy SMC footprint compatibility is mandatory |
Compared with SMBJ51A and 1.5SMC51A, P6SMAJ51ADF delivers identical clamping performance in a 30% smaller footprint and 35% lower junction-to-ambient thermal resistance on optimized pads-making it optimal for space- and thermally constrained industrial and automotive PCBs.
Availability
P6SMAJ51ADF is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and programmable logic controllers requiring stable component supply and consistent surge immunity performance.
Supply support for P6SMAJ51ADF 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 integrated circuits, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The P6SMAJ series belongs to Diodes' transient voltage suppressor product line, engineered specifically for robust, low-profile overvoltage protection in harsh-environment power and signal interfaces.
FAQ
What is the polarity configuration of P6SMAJ51ADF?
P6SMAJ51ADF is a unidirectional TVS diode with cathode-anode polarity. Pin 1 (marked with cathode band) connects to the line being protected; Pin 2 connects to ground. It conducts only during reverse overvoltage events-not during forward bias, making it unsuitable for bidirectional AC line protection without external circuitry.
Can P6SMAJ51ADF be used in place of a bidirectional TVS?
No-P6SMAJ51ADF is strictly unidirectional and lacks symmetrical clamping behavior. Substituting it for a bidirectional part (e.g., P6SMBJ51CA) would leave positive-going transients unprotected. For AC or differential signal lines, a dedicated bidirectional TVS with matched ±51 V standoff must be selected.
What is the maximum allowable PCB pad size for optimal thermal performance?
For best thermal performance, Diodes Incorporated specifies a 0.4" × 0.25" (10.2 mm × 6.4 mm) copper pad on FR-4, achieving RθJA = 92 °C/W. Reducing pad area increases thermal resistance; exceeding dimensions yields diminishing returns unless internal copper planes are also expanded.
Does P6SMAJ51ADF meet AEC-Q200 stress testing requirements?
No-P6SMAJ51ADF is not AEC-Q200 qualified. While it operates from –55°C to +150°C and is used in automotive applications, it lacks the full qualification test suite (e.g., temperature cycling, vibration, humidity bias). For AEC-Q200-compliant designs, Diodes' AEC-Q200-qualified SMAJ series (e.g., SMAJ51A-Q) should be specified instead.
P6SMAJ51ADF 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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- 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
P6SMAJ51ADF FAQ
1.How can I place an order for P6SMAJ51ADF through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMAJ51ADF 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 P6SMAJ51ADF reliable?
The price and inventory of P6SMAJ51ADF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMAJ51ADF is usually 5 days.
3.What payment methods are accepted for P6SMAJ51ADF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMAJ51ADF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMAJ51ADF?
P6SMAJ51ADF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMAJ51ADF 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 P6SMAJ51ADF?
For technical support, including P6SMAJ51ADF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMAJ51ADF requirements.
6.How does Aetrix verify that P6SMAJ51ADF is sourced from the original manufacturer or authorized distributors?
All P6SMAJ51ADF 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 P6SMAJ51ADF meets industry standards.
7.What is the process for return or replacement of P6SMAJ51ADF?
All P6SMAJ51ADF units undergo pre-shipment inspection (PSI). If there is an issue with P6SMAJ51ADF, 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 P6SMAJ51ADF part is unused and in its original packaging.
Return procedure for P6SMAJ51ADF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMAJ51ADF Tags
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