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Diodes Incorporated P4SMAJ51ADF-13
- Part No.:
- P4SMAJ51ADF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- 2-SMD, Flat Leads
- Datasheet:
-
P4SMAJ51ADF-13.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR D-F
- Quantity:
- Payment:
- Shipping:
Inventory:3,839
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Product details
Overview
P4SMAJ51ADF-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 51 V, clamps transients to ≤82.4 V at 4.9 A peak pulse current, and delivers IEC 61000-4-2 ESD immunity of ±30 kV (air/contact). Used in industrial power supplies, automotive body control modules, and PoE-powered Ethernet interfaces.
For engineers reviewing the P4SMAJ51ADF-13 datasheet, P4SMAJ51ADF-13 pinout, P4SMAJ51ADF-13 application, or P4SMAJ51ADF-13 equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, thermal resistance under PCB layout constraints, peak pulse current capability for surge compliance (IEC 61000-4-5), and D-FLAT package compatibility with high-density routing.
Technical Context
This TVS operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds 56.7 V (min breakdown), with tight tolerance (56.7–62.7 V) ensuring predictable turn-on across temperature. Its glass-passivated die construction provides stable leakage (<1 µA at 51 V) and robust surge endurance under repetitive 10/1000 µs waveforms.
The device uses a cathode-band polarity indicator and is optimized for low-inductance mounting on FR-4 PCBs with defined copper pad geometries-thermal resistance junction-to-terminal is 37 °C/W (1"×1" pad) or 39 °C/W (0.4"×0.5" pad), directly impacting sustained power handling in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - Sustains single 10/1000 µs surges up to this level without failure |
| Reverse Standoff Voltage (VRWM) | 51 V - Maximum continuous DC or RMS voltage before significant leakage |
| Breakdown Voltage (VBR) | 56.7–62.7 V @ 1 mA - Confirmed avalanche initiation range for reliable triggering |
| Clamping Voltage (VC) | ≤82.4 V @ 4.9 A - Limits downstream voltage during surge, protecting 60 V-rated ICs |
| ESD Rating | ±30 kV (air/contact) per IEC 61000-4-2 - Meets Level 4 system-level ESD immunity |
| Thermal Resistance (RθJT) | 37 °C/W - Enables 1.0 W steady-state dissipation at TL = +75°C with proper pad design |
| Capacitance | ≈25 pF @ 0 V, 1 MHz - Low enough for USB 2.0 and RS-485 data line protection |
Pinout & Package
Package: D-FLAT (low-profile surface-mount 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) | Input/Line side connection | Connected to protected line; carries surge current into cathode during clamping |
| Cathode (Pin 2) | Ground/reference node | Tied to system ground or low-impedance return; defines clamping reference point |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile D-FLAT package | Reduces board height to ≤1.1 mm and saves >30% area vs. SMA packages |
| Glass-passivated die | Ensures long-term stability of VBR and leakage under thermal cycling and humidity |
| 400 W peak pulse rating | Supports IEC 61000-4-5 Level 3 (1 kV, 2 Ω source) surge testing on 24 V systems |
| Halogen- and antimony-free | Meets JEDEC J-STD-709B green material requirements (<900 ppm Br/Cl, <1000 ppm Sb) |
| Matte tin annealed terminations | Guarantees solderability per MIL-STD-202 Method 208 and RoHS-compliant reflow profiles |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: 24 V DC input channels exposed to load dump and inductive switching noise in programmable logic controllers. IC Role / Device Role: Unidirectional TVS placed between terminal block and protection IC to clamp transients before they reach interface ASICs. Use Value: Clamps 40 A surges to ≤82.4 V, maintaining safe margin below 100 V absolute maximum ratings of isolated RS-485 transceivers. |
Use Scenario: LIN bus and sensor supply lines in door module ECUs subject to battery reverse polarity and jump-start spikes. IC Role / Device Role: Primary overvoltage clamp on 12 V rail feeding microcontroller and Hall-effect sensors. Use Value: Withstands 30 kV ESD events and limits clamping voltage to protect 5 V LDO outputs feeding 3.3 V MCU cores. |
| POE-Powered Ethernet Switch | Medical Diagnostic Equipment Power Input |
|
Use Scenario: 48 V DC input stage of IEEE 802.3af/at powered devices subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role: First-line transient suppressor upstream of DC-DC converter and hot-swap controller. Use Value: 400 W rating handles 10/1000 µs surges up to 4.9 A while maintaining <25 pF capacitance to avoid signal integrity degradation on MDI pairs. |
Use Scenario: Mains-derived 24 V auxiliary supply in ultrasound imaging units requiring low-noise, high-reliability operation. IC Role / Device Role: Secondary surge protection after primary MOV stage, filtering residual fast-rising transients. Use Value: Glass-passivated construction ensures no parametric drift over 10-year service life; RoHS/green compliance meets IEC 60601-1 Annex C requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A (Bourns) | Same 51 V VRWM, but SMB package (higher RθJA = 130 °C/W); clamping voltage 85 V @ 4.7 A | Less effective thermal management in dense layouts; requires larger copper area for equivalent power handling | Select if existing footprint uses SMB and board space allows larger pad area |
| 1.5SMC51A (ON Semiconductor) | Higher 1500 W rating but DO-214AB package; clamping voltage 87.1 V @ 17.2 A; 2x physical size | Better for high-energy surges but incompatible with D-FLAT space constraints and automated placement | Choose only when surge energy exceeds 400 W and board real estate permits larger footprint |
Compared with SMBJ51A and 1.5SMC51A, P4SMAJ51ADF-13 offers optimal balance of low profile, precise clamping (82.4 V), and thermal performance in space-constrained industrial and automotive designs where D-FLAT's 1.1 mm height and 37 °C/W RθJT are decisive.
Availability
P4SMAJ51ADF-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and PoE-powered Ethernet switches requiring stable component supply with full traceability and lifecycle support.
Supply support for P4SMAJ51ADF-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 portfolio, engineered specifically for compact, high-efficiency surge suppression in space-limited applications where thermal performance and ESD robustness are critical.
FAQ
What is the maximum operating temperature for P4SMAJ51ADF-13?
The device supports continuous operation from –55 °C to +150 °C junction temperature. At ambient temperatures above +25 °C, derating applies: peak pulse power drops linearly to ~50% at +125 °C per Figure 1. PCB copper area directly affects achievable TJ; use the 1"×1" pad layout for best thermal performance.
Can P4SMAJ51ADF-13 be used for bidirectional protection?
No-it is a unidirectional TVS diode with cathode-band polarity. For bidirectional protection, a pair of P4SMAJ51ADF-13 devices in series opposition or a dedicated bidirectional part like P4SMAJ51CA is required. Using it in reverse-biased configuration risks permanent damage above 51 V.
How does its clamping voltage compare to competing 51 V TVS diodes?
At 4.9 A peak pulse current, P4SMAJ51ADF-13 clamps to ≤82.4 V-tighter than SMBJ51A (85 V) and significantly lower than 1.5SMC51A (87.1 V). This 4.7 V margin enables safer protection of 80 V-rated MOSFETs and 75 V-input DC-DC controllers without overdesigning downstream components.
Is the D-FLAT package compatible with standard reflow profiles?
Yes-the matte tin annealed terminations meet IPC-J-STD-020 moisture sensitivity level 1 and are qualified for lead-free reflow up to 260 °C peak temperature. Pre-bake is not required; standard J-STD-020 profile with 60–90 sec above 217 °C ensures void-free solder joints on 0.2 mm thick stencil apertures.
P4SMAJ51ADF-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 2-SMD, Flat Leads
- Series:
- P4SMAJ
- Packaging:
- Tape & Reel (TR)
- 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):
- 4.9A
- 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
P4SMAJ51ADF-13 FAQ
1.How can I place an order for P4SMAJ51ADF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMAJ51ADF-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 P4SMAJ51ADF-13 reliable?
The price and inventory of P4SMAJ51ADF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMAJ51ADF-13 is usually 5 days.
3.What payment methods are accepted for P4SMAJ51ADF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMAJ51ADF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMAJ51ADF-13?
P4SMAJ51ADF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMAJ51ADF-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 P4SMAJ51ADF-13?
For technical support, including P4SMAJ51ADF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMAJ51ADF-13 requirements.
6.How does Aetrix verify that P4SMAJ51ADF-13 is sourced from the original manufacturer or authorized distributors?
All P4SMAJ51ADF-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 P4SMAJ51ADF-13 meets industry standards.
7.What is the process for return or replacement of P4SMAJ51ADF-13?
All P4SMAJ51ADF-13 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMAJ51ADF-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 P4SMAJ51ADF-13 part is unused and in its original packaging.
Return procedure for P4SMAJ51ADF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMAJ51ADF-13 Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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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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Diodes Incorporated
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Diodes Incorporated
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