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Diodes Incorporated P4SMAJ28ADF-13
- Part No.:
- P4SMAJ28ADF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- 2-SMD, Flat Leads
- Datasheet:
-
P4SMAJ28ADF-13.pdf
- Description:
- TVS DIODE 28VWM 45.4VC D-FLAT
- Quantity:
- Payment:
- Shipping:
Inventory:9,562
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Product details
Overview
P4SMAJ28ADF-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 interfaces. It features a reverse standoff voltage of 28 V, breakdown voltage range 31.1–34.4 V at 1.0 mA, clamping voltage of 45.4 V at 8.8 A peak pulse current, and IEC 61000-4-2 ESD rating of ±30 kV (air/contact). It is used in industrial power supplies to protect downstream regulators from load dump and surge events.
For engineers reviewing the P4SMAJ28ADF-13 datasheet, P4SMAJ28ADF-13 pinout, P4SMAJ28ADF-13 application, or P4SMAJ28ADF-13 equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, peak pulse current capability under 10/1000 µs waveform, thermal resistance (RθJA = 88 °C/W on small pad), and D-FLAT package compatibility with high-density PCB layouts.
Technical Context
This unidirectional TVS diode operates in avalanche breakdown mode during transient events, diverting surge current away from sensitive circuitry while maintaining low clamping voltage. Its glass-passivated die construction ensures stable breakdown characteristics and long-term reliability under repetitive surges.
The device complies with IEC 61000-4-2 Level 4 ESD immunity (±30 kV air/±30 kV contact) and is rated for 400 W non-repetitive peak pulse power per 10 × 1000 µs waveform. Thermal performance is specified for two PCB mounting conditions: RθJT = 39 °C/W and RθJA = 88 °C/W on a 0.4" × 0.5" FR-4 board with 0.2" × 0.25" copper pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - Sustains single 10×1000 µs transients without failure |
| Reverse Standoff Voltage (VRWM) | 28 V - Maximum continuous DC voltage before leakage exceeds 1 µA |
| Breakdown Voltage (VBR) | 31.1–34.4 V @ 1.0 mA - Ensures reliable triggering above normal operating rail |
| Clamping Voltage (VC) | 45.4 V @ 8.8 A - Limits voltage seen by protected IC during worst-case surge |
| ESD Rating | ±30 kV (air/contact) - Meets IEC 61000-4-2 Level 4 for system-level ESD robustness |
| Package | D-FLAT - Low-profile (1.1 mm max height), 2-pin surface-mount for space-constrained designs |
| Operating Temp | −55 °C to +150 °C - Suitable for under-hood automotive and industrial environments |
Pinout & Package
Package: D-FLAT - Molded plastic case, UL 94V-0 rated, cathode band polarity indicator, matte tin annealed terminals, 0.035 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Anode of internal PN junction | Connected to protected line; conducts surge current to 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 |
|---|---|
| Glass-passivated die | Ensures stable VBR tolerance and long-term reliability under thermal cycling |
| Low-profile D-FLAT package | Reduces board footprint vs. SMA/SMB; enables <1.1 mm Z-height designs |
| IEC 61000-4-2 compliant | Validated ±30 kV ESD immunity eliminates need for external ESD staging in many applications |
| Lead-free & halogen-free | RoHS 3 and "Green" compliant (<900 ppm Br/Cl, <1000 ppm Sb) for global environmental compliance |
Applications
| Industrial Power Input Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller exposed to ISO 7637-2 pulse 1/2a/5a transients. IC Role / Device Role: Primary unidirectional TVS clamp on main supply rail upstream of DC-DC converter. Use Value: Clamps 45.4 V at 8.8 A, protecting 36 V-rated input capacitors and LDOs from destructive overvoltage. | Use Scenario: LIN bus transceiver power line in door module subjected to battery disconnect spikes. IC Role / Device Role: Secondary surge suppression between fuse and local regulator feeding LIN PHY. Use Value: Withstands 400 W pulses and −55 °C to +150 °C operation, meeting AEC-Q200 stress requirements. |
| Telecom Remote Radio Unit | Medical Diagnostic Equipment Interface |
Use Scenario: 28 V auxiliary power feed to RF amplifier in outdoor base station cabinet. IC Role / Device Role: Front-end TVS on PoE-derived 28 V supply line subject to lightning-induced surges. Use Value: 45.4 V clamping ensures headroom below 48 V absolute maximum rating of GaN FET drivers. | Use Scenario: External sensor interface port on ultrasound imaging console exposed to ESD during cable hot-plug. IC Role / Device Role: Board-level ESD protection on 28 V bias rail feeding analog front-end amplifiers. Use Value: ±30 kV air/contact ESD rating meets IEC 61000-4-2, eliminating secondary protection stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-13-F | Same 28 V VRWM, but 400 W rating uses larger SMA package (RθJA ≈ 110 °C/W); no IEC 61000-4-2 data published | Less suitable for ultra-thin or thermally constrained boards due to higher thermal resistance | Select when legacy SMA footprint compatibility is required and board space allows |
| 1.5SMC28A | Higher 1500 W rating, DO-214AB package, VC = 46.6 V @ 32.2 A; RθJA ≈ 50 °C/W on large pad | Over-specified for 400 W needs; requires larger PCB area and different layout | Select only if system-level testing demands >1 kW surge handling or lower thermal impedance |
Compared with SMAJ28A-13-F and 1.5SMC28A, P4SMAJ28ADF-13 delivers identical electrical protection in a smaller D-FLAT package with verified ±30 kV ESD performance-critical for compact, high-reliability industrial and automotive modules where board space and ESD compliance are co-constrained.
Availability
P4SMAJ28ADF-13 is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, telecom remote radio units, and medical diagnostic equipment interfaces requiring stable component supply and full RoHS 3 compliance.
Supply support for P4SMAJ28ADF-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 P4SMAJ series belongs to Diodes' transient voltage suppressor product line, engineered specifically for space-constrained, high-surge environments where low-profile packaging, precise clamping, and certified ESD robustness are mandatory design requirements.
FAQ
What is the maximum clamping voltage of P4SMAJ28ADF-13 under standard test conditions?
The maximum clamping voltage (VC) is 45.4 V at 8.8 A peak pulse current, measured per the 10 × 1000 µs waveform defined in IEC 61000-4-5. This value is guaranteed across temperature and lifetime, and represents the highest voltage imposed on protected circuitry during a worst-case surge event.
Does P4SMAJ28ADF-13 support bidirectional transient suppression?
No. P4SMAJ28ADF-13 is a unidirectional TVS diode, configured for protection against positive-going transients on grounded systems. It does not suppress negative transients beyond its forward voltage (~3.5 V at 35 A), and is not rated for AC line or bipolar signal protection without external circuitry.
How does the D-FLAT package affect thermal performance compared to SMA?
The D-FLAT package achieves RθJA = 88 °C/W on a 0.4" × 0.5" FR-4 board-significantly better than typical SMA packages (~110 °C/W)-due to optimized thermal pad geometry and direct die-to-pad conduction. This enables higher sustained surge duty cycles in thermally dense layouts.
Is P4SMAJ28ADF-13 qualified for automotive applications per AEC-Q200?
While P4SMAJ28ADF-13 meets critical AEC-Q200 stress parameters-including operating temperature (−55 °C to +150 °C), solderability, and moisture sensitivity level 1-it is not formally AEC-Q200 qualified. For automotive safety-critical use, Diodes recommends the AEC-Q200-qualified P4SMAJ28AQ-13 variant with additional qualification testing.
P4SMAJ28ADF-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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- 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
P4SMAJ28ADF-13 FAQ
1.How can I place an order for P4SMAJ28ADF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMAJ28ADF-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 P4SMAJ28ADF-13 reliable?
The price and inventory of P4SMAJ28ADF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMAJ28ADF-13 is usually 5 days.
3.What payment methods are accepted for P4SMAJ28ADF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMAJ28ADF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMAJ28ADF-13?
P4SMAJ28ADF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMAJ28ADF-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 P4SMAJ28ADF-13?
For technical support, including P4SMAJ28ADF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMAJ28ADF-13 requirements.
6.How does Aetrix verify that P4SMAJ28ADF-13 is sourced from the original manufacturer or authorized distributors?
All P4SMAJ28ADF-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 P4SMAJ28ADF-13 meets industry standards.
7.What is the process for return or replacement of P4SMAJ28ADF-13?
All P4SMAJ28ADF-13 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMAJ28ADF-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 P4SMAJ28ADF-13 part is unused and in its original packaging.
Return procedure for P4SMAJ28ADF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMAJ28ADF-13 Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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