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Diodes Incorporated P4SMAJ85ADF-13
- Part No.:
- P4SMAJ85ADF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- 2-SMD, Flat Leads
- Datasheet:
-
P4SMAJ85ADF-13.pdf
- Description:
- TVS DIODE 85VWM 137VC D-FLAT
- Quantity:
- Payment:
- Shipping:
Inventory:7,373
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Product details
Overview
P4SMAJ85ADF-13 from Diodes Incorporated is a 400W 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 85V, clamping voltage of 137V at 2.9A peak pulse current, and IEC 61000-4-2 ESD rating of ±30kV (air/contact). Used in industrial power supplies, automotive body electronics, and telecom interface protection.
For engineers reviewing the P4SMAJ85ADF-13 datasheet, P4SMAJ85ADF-13 pinout, P4SMAJ85ADF-13 application, or P4SMAJ85ADF-13 equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, peak pulse current capability under 10/1000µs waveform, thermal resistance on FR-4 PCB, and D-FLAT package compatibility with automated SMT assembly.
Technical Context
This unidirectional TVS diode operates as a fast-acting shunt clamp during transient events, with breakdown voltage specified at 94.4–104V (1mA test current) and guaranteed clamping at ≤137V under 2.9A 10×1000µs surge. Its glass-passivated junction ensures stable leakage (<1µA at 85V) and robust ESD immunity.
Thermal performance is defined for two PCB mounting conditions: RθJA = 114°C/W (1"×1" pad) and 88°C/W (0.4"×0.5" pad), while RθJT is 37–39°C/W. The device is rated for operation from –55°C to +150°C and supports steady-state power dissipation up to 1.0W at TL = +75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - Sustains single 10×1000µs transients without failure under defined thermal conditions. |
| Reverse Standoff Voltage (VRWM) | 85V - Maximum continuous DC or RMS voltage before significant leakage; sets operating margin below protected circuit's max rating. |
| Clamping Voltage (VC) | 137V @ 2.9A - Voltage seen by downstream circuit during worst-case surge; must stay below IC absolute maximum ratings. |
| Breakdown Voltage (VBR) | 94.4–104V @ 1mA - Confirmed avalanche initiation range; ensures reliable turn-on before damage threshold. |
| ESD Rating | ±30kV air / ±30kV contact per IEC 61000-4-2 - Validated immunity level for human-body-model surges in end-equipment interfaces. |
| Junction-to-Ambient RθJA | 88°C/W (0.4"×0.5" pad) - Enables thermal design for sustained surge duty in compact layouts with limited copper area. |
Pinout & Package
Package: D-FLAT (low-profile surface-mount package with 2 terminals, UL 94V-0 molded plastic case, cathode band polarity indicator).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Anode-side connection point for reverse-biased TVS operation | Connected to protected line; conducts during overvoltage to shunt current to ground. |
| 2 (Anode) | Reference/ground return path | Typically tied to system ground plane; completes clamping path during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Ensures stable electrical parameters and long-term reliability under humidity and thermal cycling stress. |
| Low-profile D-FLAT package | 0.9–1.1mm height enables use in space-constrained designs while maintaining 400W surge capability. |
| Lead-free, halogen-free, RoHS 3 compliant | Meets global environmental regulations including <900ppm Br/Cl and <1000ppm Sb compounds. |
| High ESD immunity | ±30kV contact/air discharge tolerance eliminates need for additional ESD protection in many front-end interfaces. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24V DC input rail in programmable logic controllers exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role: Unidirectional TVS clamp placed between input connector and DC-DC converter input. Use Value: Limits transient voltage to ≤137V, protecting downstream regulator ICs rated for 150V absolute maximum. |
Use Scenario: LIN bus transceiver power supply line in door module subjected to battery disconnect spikes. IC Role / Device Role: Primary overvoltage suppression element on VCC rail upstream of transceiver IC. Use Value: Withstands 40A surge (8.3ms half-sine) and clamps 10/1000µs transients to safe levels for 5V-tolerant transceivers. |
| Telecom Ethernet Port Protection | Smart Meter AC/DC Auxiliary Supply |
Use Scenario: Secondary-side 12V bias rail feeding PoE-powered Ethernet PHY ICs in network switches. IC Role / Device Role: Final-stage surge protector after common-mode chokes and primary TVS array. Use Value: Provides precise 85V standoff and low clamping to avoid false triggering while ensuring PHY survival under lightning-induced surges. |
Use Scenario: Output of isolated flyback converter supplying microcontroller and RTC in utility meter. IC Role / Device Role: Overvoltage guard on regulated 3.3V or 5V auxiliary rail against transformer regulation fault. Use Value: Fast response (<1ns) and low leakage (<1µA) prevent brownout or latch-up during normal operation while blocking fault energy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85A | Same 85V VRWM, but 600W peak power and SMB package (higher RθJA ≈ 125°C/W). | Higher surge capacity suits infrequent high-energy events; larger footprint may conflict with dense layouts. | Select when surge energy exceeds 400W requirement and board space allows SMB footprint. |
| 1.5SMC85A | Same 85V rating, 1500W peak power, DO-214AB package, higher capacitance (~200pF vs. ~50pF). | Higher clamping voltage (140V) and capacitance limit use in high-speed data lines. | Prefer for high-power industrial mains inputs where speed and capacitance are secondary to energy handling. |
Compared with SMBJ85A and 1.5SMC85A, P4SMAJ85ADF-13 offers optimal balance of compact D-FLAT packaging, controlled 137V clamping, and sufficient 400W surge rating for cost-sensitive, space-constrained DC rail protection-without over-specifying power or capacitance.
Availability
P4SMAJ85ADF-13 is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, and telecom Ethernet port protection requiring stable component supply and consistent D-FLAT tape-and-reel delivery.
Supply support for P4SMAJ85ADF-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 communications markets.
P4SMAJ85ADF-13 belongs to the P4SMAJ series of surface-mount TVS diodes engineered for robust transient suppression in space-constrained, high-volume applications where low profile, consistent clamping, and environmental compliance are critical.
FAQ
What is the maximum clamping voltage of P4SMAJ85ADF-13 under standard test conditions?
The maximum clamping voltage is 137V, measured at a peak pulse current (IPP) of 2.9A using the standardized 10×1000µs waveform per IEC 61000-4-5. This value is guaranteed across temperature and process variation, and defines the upper voltage limit imposed on protected circuits during surge events.
Can P4SMAJ85ADF-13 be used in bidirectional configurations?
No - P4SMAJ85ADF-13 is a unidirectional TVS diode with cathode-anode polarity. It conducts only when the cathode is positive relative to the anode. For bidirectional protection, two devices must be connected in series opposing configuration, or a dedicated bidirectional part like P4SMAJ85CA must be selected.
What is the typical total capacitance of this TVS diode at zero bias?
The typical total capacitance is approximately 50pF at 1MHz and 0V DC bias, as shown in Figure 2 of the datasheet. This low capacitance makes it suitable for protecting moderate-speed signal lines and DC power rails without degrading signal integrity or causing excessive loading.
How does the D-FLAT package affect thermal performance compared to SMA or SMB packages?
The D-FLAT package provides lower thermal resistance to the PCB (RθJT = 37–39°C/W) due to its flat, wide terminal geometry and direct thermal path to copper pads. Compared to SMA (RθJA ≈ 150°C/W) or SMB (≈125°C/W), it delivers superior power derating above +25°C ambient, especially on small-pitch layouts.
P4SMAJ85ADF-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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 2.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D-Flat
P4SMAJ85ADF-13 FAQ
1.How can I place an order for P4SMAJ85ADF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMAJ85ADF-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 P4SMAJ85ADF-13 reliable?
The price and inventory of P4SMAJ85ADF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMAJ85ADF-13 is usually 5 days.
3.What payment methods are accepted for P4SMAJ85ADF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMAJ85ADF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMAJ85ADF-13?
P4SMAJ85ADF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMAJ85ADF-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 P4SMAJ85ADF-13?
For technical support, including P4SMAJ85ADF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMAJ85ADF-13 requirements.
6.How does Aetrix verify that P4SMAJ85ADF-13 is sourced from the original manufacturer or authorized distributors?
All P4SMAJ85ADF-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 P4SMAJ85ADF-13 meets industry standards.
7.What is the process for return or replacement of P4SMAJ85ADF-13?
All P4SMAJ85ADF-13 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMAJ85ADF-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 P4SMAJ85ADF-13 part is unused and in its original packaging.
Return procedure for P4SMAJ85ADF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMAJ85ADF-13 Tags
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