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Diodes Incorporated P4SMAJ12ADF-13
- Part No.:
- P4SMAJ12ADF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- 2-SMD, Flat Leads
- Datasheet:
-
P4SMAJ12ADF-13.pdf
- Description:
- TVS DIODE 12VWM 19.9VC D-FLAT
- Quantity:
- Payment:
- Shipping:
Inventory:9,850
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Product details
Overview
P4SMAJ12ADF-13 from Diodes Incorporated is a 400W surface-mount transient voltage suppressor (TVS) diode designed for unidirectional overvoltage protection in DC power lines and signal paths. It features a reverse standoff voltage of 12 V, clamping voltage of 19.9 V at 20.1 A peak pulse current, and IEC 61000-4-2 ESD rating of ±30 kV (air/contact). Used in industrial power supplies and automotive body electronics to protect downstream ICs from EFT and lightning-induced surges.
For engineers reviewing the P4SMAJ12ADF-13 datasheet, P4SMAJ12ADF-13 pinout, P4SMAJ12ADF-13 application, or P4SMAJ12ADF-13 equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, thermal resistance under PCB layout constraints, and D-FLAT package compatibility with high-density routing.
Technical Context
This unidirectional TVS diode operates in avalanche breakdown mode during transient events, providing low-impedance shunting above its 13.3–14.7 V breakdown range. Its glass-passivated die construction ensures stable leakage performance (<1 µA at 12 V) and robust surge handling across -55°C to +150°C operating temperature.
The device uses a single-junction PN structure with cathode-band polarity marking and is optimized for 10/1000 µs waveform compliance per IEC 61000-4-5. Thermal resistance is 37°C/W junction-to-terminal when mounted on a 1"×1" FR-4 board with 2 oz copper, enabling reliable 400 W non-repetitive pulse dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 10/1000 µs transients without failure under defined thermal conditions |
| Reverse Standoff Voltage | 12 V - maximum continuous DC voltage before significant leakage; sets minimum system operating margin |
| Breakdown Voltage Range | 13.3–14.7 V @ 1 mA - defines guaranteed conduction onset for overvoltage clamping |
| Clamping Voltage | 19.9 V @ 20.1 A - maximum voltage seen by protected circuit during worst-case surge |
| ESD Rating | ±30 kV air / ±30 kV contact - meets IEC 61000-4-2 Level 4 for system-level ESD immunity |
| Junction-to-Ambient RθJA | 88 °C/W - measured on 0.4"×0.5" FR-4 pad; determines max ambient temp for full power operation |
| Capacitance | 120 pF @ 0 V, 1 MHz - limits high-frequency signal distortion in data line protection |
Pinout & Package
Package: D-FLAT (low-profile surface-mount), molded plastic case with UL 94V-0 flammability rating, cathode band polarity indicator, and matte tin annealed copper leadframe terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Anode of internal PN junction | Connected to protected line; conducts surge current toward ground when voltage exceeds VBR |
| 2 (Anode) | Cathode of internal PN junction | Typically tied to system ground; completes current path during clamping event |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile D-FLAT package | Height ≤ 1.1 mm enables use in space-constrained industrial and automotive modules |
| Glass-passivated die | Ensures <1 µA leakage at VRWM and stable VBR over lifetime and temperature cycling |
| 400 W peak pulse rating | Supports IEC 61000-4-5 Level 3 (1 kV line-to-line, 2 kV line-to-ground) surge testing |
| Halogen- and antimony-free | Meets RoHS 3 and JEDEC J-STD-020 MSL Level 1 for moisture-insensitive reflow assembly |
Applications
| Industrial Power Input Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input rail in programmable logic controllers exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed upstream of DC-DC converter input to clamp transients before regulation stage. Use Value: Clamps to 19.9 V, maintaining safe margin below 28 V absolute max rating of buck controller IC. |
Use Scenario: LIN bus transceiver power supply in door module subjected to battery disconnect spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VCC rail feeding LIN PHY and microcontroller. Use Value: Sub-20 V clamping prevents latch-up in 5 V LDO regulators while surviving 40 A surge peaks. |
| USB Type-C Port Protection | Smart Meter Communication Interface |
Use Scenario: VBUS line protection in USB-C receptacle where hot-plug surges exceed 20 V. IC Role / Device Role / Timing Role: First-stage clamp ahead of polyfuse and load switch to limit energy into downstream protection ICs. Use Value: 120 pF capacitance avoids USB 2.0 signal integrity degradation while delivering 400 W surge absorption. |
Use Scenario: RS-485 transceiver power rail in utility meter exposed to induced surges on long outdoor wiring. IC Role / Device Role / Timing Role: Standoff-rated TVS on isolated 3.3 V supply derived from flyback converter secondary. Use Value: 13.3–14.7 V VBR ensures no conduction during normal 12 V bias, yet triggers within 1 ns of overvoltage onset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-13-F | Same 12 V VRWM and 19.9 V VC, but SMA package (higher RθJA = 114°C/W) and lower IPP (19.5 A) | Less effective in thermally constrained layouts; requires larger copper area for same power handling | Prefer when legacy SMA footprint exists and surge duty cycle is low |
| 1.5SMC12A | Higher 1.5 kW rating but SMC package (4.5 mm × 3.9 mm); 20.1 V VC, 19.9 A IPP | Better for high-energy surges but incompatible with D-FLAT board space; higher parasitic inductance | Select only when 400 W is insufficient and board real estate allows SMC footprint |
Compared with SMAJ12A-13-F and 1.5SMC12A, P4SMAJ12ADF-13 delivers optimal balance of low-profile packaging, precise 12 V standoff, and verified 400 W capability-making it ideal for modern compact designs requiring repeatable surge immunity without thermal derating penalties.
Availability
P4SMAJ12ADF-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, USB-C interface protection, and smart meter communication interfaces requiring stable component supply and consistent surge performance across production batches.
Supply support for P4SMAJ12ADF-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 consumer markets.
P4SMAJ12ADF-13 belongs to the P4SMAJ series of surface-mount TVS diodes engineered for robust transient suppression in space-limited applications where thermal efficiency and ESD immunity are critical design requirements.
FAQ
What is the maximum allowable PCB pad size for optimal thermal performance?
The datasheet specifies two mounting configurations: for 37°C/W RθJT, use a 1"×1", 2 oz copper pad; for 39°C/W, use a 0.4"×0.5", 2 oz pad with 0.2"×0.25" thermal pad. Exceeding these dimensions yields diminishing returns due to lateral heat spreading limits in FR-4 substrate.
Does P4SMAJ12ADF-13 meet AEC-Q200 stress test requirements?
No-P4SMAJ12ADF-13 is not AEC-Q200 qualified. Diodes Incorporated offers the automotive-grade P4SMAJ12AHE3_A/H series for AEC-Q200 Grade 2 (-40°C to +105°C) applications; this part is rated for industrial temperature range (-55°C to +150°C) only.
Can this TVS be used in bidirectional signal line protection?
No-it is unidirectional. The device conducts only when cathode voltage exceeds anode by >13.3 V. For bidirectional protection (e.g., RS-485, CAN), use a symmetric TVS like SMBJ12CA or dual-diode arrays such as D3V3M1U.
How does clamping voltage change at elevated ambient temperatures?
Clamping voltage increases ~0.1% per °C rise above 25°C due to positive temperature coefficient of avalanche breakdown. At 125°C ambient, VC rises to approximately 20.7 V at 20.1 A-still within safe margin for most 24 V system ICs with 28 V abs max rating.
P4SMAJ12ADF-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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 20.1A
- Power - Peak Pulse:
- 400W
- 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
P4SMAJ12ADF-13 FAQ
1.How can I place an order for P4SMAJ12ADF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMAJ12ADF-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 P4SMAJ12ADF-13 reliable?
The price and inventory of P4SMAJ12ADF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMAJ12ADF-13 is usually 5 days.
3.What payment methods are accepted for P4SMAJ12ADF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMAJ12ADF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMAJ12ADF-13?
P4SMAJ12ADF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMAJ12ADF-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 P4SMAJ12ADF-13?
For technical support, including P4SMAJ12ADF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMAJ12ADF-13 requirements.
6.How does Aetrix verify that P4SMAJ12ADF-13 is sourced from the original manufacturer or authorized distributors?
All P4SMAJ12ADF-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 P4SMAJ12ADF-13 meets industry standards.
7.What is the process for return or replacement of P4SMAJ12ADF-13?
All P4SMAJ12ADF-13 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMAJ12ADF-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 P4SMAJ12ADF-13 part is unused and in its original packaging.
Return procedure for P4SMAJ12ADF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMAJ12ADF-13 Tags
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ESD9B5.0ST5G
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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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Diodes Incorporated
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