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Diodes Incorporated P4SMAJ70ADF-13
- Part No.:
- P4SMAJ70ADF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- 2-SMD, Flat Leads
- Datasheet:
-
P4SMAJ70ADF-13.pdf
- Description:
- TVS DIODE 70VWM 113VC D-FLAT
- Quantity:
- Payment:
- Shipping:
Inventory:4,694
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Product details
Overview
P4SMAJ70ADF-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 70V, clamping voltage of 113V at 3.5A peak pulse current, and IEC 61000-4-2 ESD rating of ±30kV (air/contact). Used in industrial power supplies and automotive infotainment input protection.
For engineers reviewing the P4SMAJ70ADF-13 datasheet, P4SMAJ70ADF-13 pinout, P4SMAJ70ADF-13 application, or P4SMAJ70ADF-13 equivalent, this page delivers verified electrical parameters, D-FLAT package layout, clamping performance under 10×1000µs surge, and direct replacement guidance for board-level ESD and surge hardening.
Technical Context
This unidirectional TVS diode operates as a shunt-clamping device that remains high-impedance below 70V VRWM and rapidly transitions to low-impedance conduction above its 77.8–86.0V breakdown range. Its glass-passivated junction ensures stable leakage (<1µA at 70V) and repeatable clamping behavior across temperature.
Designed for single-pulse transients per the 10×1000µs waveform standard, it delivers 400W peak pulse power with thermal resistance of 37°C/W (junction-to-terminal) when mounted on a 1"×1" FR-4 PCB. Polarity is marked by a cathode band; anode and cathode terminals are optimized for low-inductance PCB routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - Sustains single 10×1000µs surges without failure under defined thermal conditions. |
| Reverse Standoff Voltage (VRWM) | 70V - Maximum continuous DC or RMS voltage before significant leakage begins. |
| Breakdown Voltage (VBR) | 77.8–86.0V @ 1mA - Confirmed avalanche onset range ensuring reliable triggering margin. |
| Clamping Voltage (VC) | 113V @ 3.5A IPP - Maximum voltage seen by protected circuit during specified surge event. |
| ESD Rating | ±30kV air / ±30kV contact - Meets IEC 61000-4-2 Level 4 for system-level ESD immunity. |
| Thermal Resistance (RθJT) | 37°C/W - Enables efficient heat transfer to PCB copper pad under steady-state surge duty. |
| Capacitance (CT) | ~15pF @ 0V, 1MHz - Low enough for USB 2.0 and RS-485 signal line protection without signal integrity loss. |
Pinout & Package
Package: D-FLAT - Low-profile surface-mount package (2.25–2.95mm width × 3.95–4.60mm length × 0.90–1.10mm height), UL 94V-0 molded plastic case with matte tin-plated copper leadframe and cathode band polarity indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | High-side connection to protected line | Connected to supply rail or signal line; conducts surge current to ground when clamped. |
| 2 (Anode) | Ground reference terminal | Low-inductance path to PCB ground plane; critical for achieving rated clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Ensures long-term stability of breakdown voltage and leakage current across humidity and temperature cycling. |
| Low-profile D-FLAT package | Reduces board space by >40% vs. SMA packages while maintaining 400W surge capability. |
| Lead-free, halogen-free, RoHS 3 compliant | Meets IPC-J-STD-020 moisture sensitivity Level 1 and global environmental compliance mandates. |
| IEC 61000-4-2 certified ESD robustness | Validated for direct integration into end-equipment without additional external ESD components. |
Applications
| Industrial Power Input Protection | Automotive Infotainment Interface |
|---|---|
Use Scenario: 24V DC input stage of programmable logic controller (PLC) module exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping positive-going surges to protect downstream DC-DC converter ICs and microcontrollers. Use Value: Limits transient voltage to ≤113V, preventing damage to 36V-rated input capacitors and enabling compliance with IEC 61000-4-5 Level 3 (1kV/2Ω). | Use Scenario: USB 2.0 data lines and auxiliary power pins in head unit connected to vehicle battery and CAN bus. IC Role / Device Role / Timing Role: Signal-line TVS protecting high-speed data paths from coupled battery transients and ESD events. Use Value: 15pF capacitance avoids signal rise-time degradation; ±30kV ESD rating satisfies ISO 10605 automotive ESD test requirements. |
| Telecom PoE Port Protection | Medical Diagnostic Equipment Interface |
Use Scenario: 48V Power over Ethernet (PoE) Type 2 (30W) port on network switch facing lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary shunt protector on DC input rail upstream of PoE controller IC and isolation transformer. Use Value: 400W peak power rating handles IEEE 802.3at surge profiles; 70V VRWM matches PoE Class 2 operating range. | Use Scenario: External sensor interface (e.g., ECG lead connector) on portable ultrasound device subject to hospital-grade ESD handling. IC Role / Device Role / Timing Role: Patient-connected-side transient suppressor meeting IEC 60601-1-2 4th edition ESD immunity requirements. Use Value: <1µA leakage at 70V prevents interference with µV-level biopotential signals; RoHS 3/Green compliance supports medical regulatory submissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-Q | Same 70V VRWM and 113V VC, but AEC-Q200 qualified and automotive-grade screening. | Required for automotive ECUs where qualification to AEC-Q200 Grade 2 (−40°C to +105°C) is mandatory. | Select when automotive qualification, extended temperature operation, or enhanced reliability testing is required. |
| 1.5SMC70A | Higher 1500W peak power, larger SMC package (7.1mm × 6.2mm), 118V clamping at 12.7A IPP. | Suitable for higher-energy surge environments (e.g., AC mains input) where board space allows larger footprint. | Choose only if surge energy exceeds 400W and PCB layout accommodates SMC outline. |
Compared with SMAJ70A-Q and 1.5SMC70A, P4SMAJ70ADF-13 offers optimal balance of compact D-FLAT packaging, industrial-grade reliability, and cost efficiency for non-automotive 400W surge protection-without sacrificing clamping precision or ESD robustness.
Availability
P4SMAJ70ADF-13 is available at Aetrix Electronics and suitable for industrial power input protection, automotive infotainment interface hardening, and telecom PoE port surge suppression requiring stable component supply and consistent parametric performance across production batches.
Supply support for P4SMAJ70ADF-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The P4SMAJ series belongs to Diodes' transient voltage suppressor portfolio, engineered specifically for high-reliability, surface-mount surge protection in space-constrained industrial and consumer systems where low capacitance and precise clamping are critical.
FAQ
What is the maximum operating temperature for P4SMAJ70ADF-13?
The device operates 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 in DS39017 Rev. 3-2. Thermal design must ensure RθJA ≤ 88°C/W on recommended PCB layout to maintain safe TJ under repeated surges.
Is P4SMAJ70ADF-13 bidirectional or unidirectional?
P4SMAJ70ADF-13 is a unidirectional TVS diode, indicated by its single cathode band marking and specification of reverse standoff voltage (VRWM = 70V). It protects against positive transients on the cathode side relative to anode (ground); for bidirectional protection, a separate part number (e.g., P4SMAJ70CA) would be required.
Does this TVS diode require a heatsink?
No external heatsink is required. The D-FLAT package relies on PCB copper area for thermal dissipation. With a 1"×1", 2oz copper pad, RθJT is 37°C/W - sufficient for single-pulse 400W events. Continuous power dissipation is limited to 1.0W at TL = +75°C, so no heatsink is needed for typical transient-only use cases.
Can P4SMAJ70ADF-13 be used in place of P4SMAJ70A?
Yes - P4SMAJ70ADF-13 and P4SMAJ70A share identical electrical specifications and D-FLAT packaging. The "-13" suffix denotes 10,000-piece tape-and-reel packaging; "-T" or no suffix may indicate different reel sizes or bulk packaging. Electrical performance, marking code (RP), and thermal characteristics are fully interchangeable.
P4SMAJ70ADF-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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- 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
P4SMAJ70ADF-13 FAQ
1.How can I place an order for P4SMAJ70ADF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMAJ70ADF-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 P4SMAJ70ADF-13 reliable?
The price and inventory of P4SMAJ70ADF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMAJ70ADF-13 is usually 5 days.
3.What payment methods are accepted for P4SMAJ70ADF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMAJ70ADF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMAJ70ADF-13?
P4SMAJ70ADF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMAJ70ADF-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 P4SMAJ70ADF-13?
For technical support, including P4SMAJ70ADF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMAJ70ADF-13 requirements.
6.How does Aetrix verify that P4SMAJ70ADF-13 is sourced from the original manufacturer or authorized distributors?
All P4SMAJ70ADF-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 P4SMAJ70ADF-13 meets industry standards.
7.What is the process for return or replacement of P4SMAJ70ADF-13?
All P4SMAJ70ADF-13 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMAJ70ADF-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 P4SMAJ70ADF-13 part is unused and in its original packaging.
Return procedure for P4SMAJ70ADF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMAJ70ADF-13 Tags
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