NTK3139PT1G

onsemi NTK3139PT1G – P-Channel MOSFET, 20 V, 0.78 A, SOT-723 with Integrated ESD Protection

The onsemi NTK3139PT1G is a small-signal, single P-channel MOSFET that combines compact size with practical power-switching performance. Rated for 20 V drain-to-source voltage (Vds) and 0.78 A continuous drain current (Id), it offers a low 480 mΩ Rds(on) and comes in an ultra-compact SOT-723 (SC-105) 3‑pin package. An integrated ESD protection structure helps safeguard the device and the surrounding circuitry during handling and assembly—valuable for high-volume portable designs.

Note: Specifications here are summarized from provided data. Always verify exact electrical characteristics, test conditions, and pin assignments in the official datasheet before finalizing your design.

At a Glance

• Brand / Manufacturer: onsemi
• MPN: NTK3139PT1G
• Category: MOSFET – P-Channel, Single
• Channel Configuration: Single P-Channel
• Drain-to-Source Voltage (Vds): 20 V
• Continuous Drain Current (Id): 0.78 A
• On-Resistance (Rds(on)): 480 mΩ (verify test conditions in datasheet)
• ESD Protection: Integrated
• Package / Case: SOT-723 (SC-105)
• Pin Count: 3
• Mounting Type: Surface Mount
• Packaging: Tape & Reel (TR)
• Lifecycle Status: Active (per provided data)
• RoHS Status: RoHS Compliant

Why Designers Choose the onsemi NTK3139PT1G

The NTK3139PT1G is tailored for portable and space-constrained systems where every square millimeter counts. Its SOT‑723 (SC‑105) footprint enables extremely dense layouts, while the low Rds(on) helps minimize conduction losses for better battery life and cooler operation. The integrated ESD protection reduces the need for additional external ESD components in many use cases, shortening the BOM and simplifying procurement.

Key benefits include:

• Space efficiency: Ultra-small 3‑pin package supports compact PCBs and modules.
• Power savings: Low Rds(on) helps lower I²R losses in low-voltage rails and battery paths.
• BOM reduction: Built-in ESD structures may reduce the number of external protection parts required.
• Simplicity: Single P‑channel device is ideal for high-side switching and load disconnect functions.

Key Specifications

• Polarity / Type: P-Channel MOSFET (single)
• Vds (Drain-to-Source Voltage): 20 V
• Id (Continuous Drain Current): 0.78 A
• Rds(on): 480 mΩ (conditions not specified here; consult datasheet)
• ESD: Integrated ESD protection
• Package: SOT‑723 (SC‑105), 3 pins
• Mounting: Surface Mount (SMT)
• Packaging Format: Tape & Reel (TR)

Additional Electrical Characteristics

The following parameters are commonly referenced for MOSFET selection but are not provided in the supplied data. Refer to the official onsemi NTK3139PT1G datasheet for values and test conditions:

• Gate-to-Source Voltage range (Vgs max): Not specified in provided data
• Gate Threshold Voltage (Vgs(th)): Not specified in provided data
• Total Gate Charge (Qg) and Input Capacitance (Ciss): Not specified in provided data
• Body diode characteristics (If, Vf, reverse recovery): Not specified in provided data
• Power dissipation (Pd) and thermal resistance (RθJA/RθJC): Not specified in provided data
• Safe Operating Area (SOA) curves: Not specified in provided data
• Rds(on) vs. Vgs and vs. temperature: Not specified in provided data

Typical Applications

The NTK3139PT1G is suitable for a range of small-signal and power-path control roles in battery-powered systems and compact electronics:

• Portable electronics and wearables
• Load switching for sensors, modules, and low-power subsystems
• Battery-powered systems, including power gating and disconnect
• Signal and low-voltage power switching in compact PCBs and IoT nodes

Application notes:

• As a P-channel device, it is convenient for high-side switching in low-voltage rails.
• The integrated ESD protection can improve robustness during manufacturing and handling, but board-level ESD protection may still be required depending on the application and compliance targets.
• Ensure adequate gate-drive headroom for the intended Rds(on) performance. Confirm gate drive levels and switching losses using the datasheet.

Design and Layout Considerations

Even with a simple 3‑pin footprint, thoughtful layout pays dividends in performance and reliability:

• Keep the high-current path short: Minimize trace length from source to load and ground return loops to reduce conduction and switching parasitics.
• Thermal spreading: Although SOT‑723 is ultra-compact, use adequate copper area connected to the drain/source as recommended by the datasheet and your PCB stackup to improve heat dissipation.
• ESD handling: The device includes integrated ESD protection, but standard ESD precautions during assembly still apply. Protect sensitive nodes on the PCB and consider system‑level ESD requirements.
• Gate network: A small series gate resistor can dampen ringing and limit peak gate current in fast edges. A pull‑down or pull‑up (as appropriate) keeps the MOSFET in a defined state during MCU reset or hot‑plug events.
• Verification: Validate switching behavior at temperature extremes and across battery/adapter voltage ranges. Confirm that the worst‑case Rds(on) and Id meet your design margins.

Sourcing, Availability, and Lifecycle

• Lifecycle status: Active (per provided data). For the latest status, confirm on onsemi’s official channels.
• Packaging: Tape & Reel (TR) is well-suited for automated assembly.
• RoHS: RoHS Compliant.
• Inventory: Availability can fluctuate; check authorized distributors and onsemi partners.

Replacement and Second-Source Guidance

If you need a drop‑in alternative or a second source, use these guidelines:

• Polarity and topology: Must be a single P‑channel MOSFET.
• Voltage rating: Vds ≥ 20 V.
• Current rating: Id ≥ 0.78 A (at your operating temperature and thermal conditions).
• Conduction losses: Rds(on) equal or lower than 480 mΩ at the same or lower gate drive, verified under comparable test conditions.
• Package and pinout: SOT‑723 (SC‑105) with compatible pin assignment and land pattern. Always compare pinouts; small‑signal packages often vary between vendors.
• ESD: If the alternative lacks integrated ESD, consider adding external ESD protection to maintain robustness.

No official, part‑number‑specific cross‑references are provided here. Use onsemi’s parametric search and the NTK3139PT1G datasheet to validate fit, form, and function.

Compliance and Environmental

• RoHS Status: RoHS Compliant (per provided data)
• Halogen/REACH and additional declarations: Not specified in provided data—consult onsemi’s product page and material compliance documents if required for your quality file.

Practical Use Cases and Implementation Tips

• Battery load switch: Use the onsemi NTK3139PT1G as a high‑side disconnect for low‑power peripherals, controlled by a GPIO through a gate resistor. Check that your logic voltage sufficiently enhances the P‑channel device for the desired current.
• Sensor and RF front-end isolation: Reduce standby current by gating supplies to inactive sections. Carefully manage inrush current and decoupling placement to avoid brownouts.
• Reverse battery protection (application-dependent): Some designs implement a P‑channel MOSFET “ideal diode” configuration for low dropout protection. Validate Vgs limits, body diode behavior, and transient stresses using the datasheet and application notes.

Quality and Reliability Considerations

• Derating: Operate with margin on Vds, Id, and power dissipation; confirm thermal behavior in your enclosure.
• ESD and handling: Even with on‑die ESD structures, standard ESD protocols should be followed during assembly and service.
• Testing: Characterize switching waveforms, hot‑plug behavior, and load transients on actual hardware to confirm safe operating margins.

Ordering Information

• Manufacturer: onsemi
• Part Number: NTK3139PT1G
• Package: SOT‑723 (SC‑105), 3 leads
• Packaging Type: Tape & Reel (TR)

For reel sizes, packing quantities, and detailed marking, consult the datasheet and distributor listings.

Frequently Asked Questions (FAQs)

• What is the voltage rating of the onsemi NTK3139PT1G?

• 20 V drain-to-source voltage (Vds), based on the provided data.

• How much current can it handle?

• 0.78 A continuous drain current (Id) per the provided spec. Ensure thermal and ambient conditions in your design support this current.

• What is the on-resistance?

• 480 mΩ Rds(on). Verify the exact gate voltage and measurement conditions in the datasheet.

• Does it include ESD protection?

• Yes. The NTK3139PT1G has integrated ESD protection, which may help reduce external protection components in some designs.

• What package is the NTK3139PT1G offered in?

• SOT‑723 (SC‑105), 3‑pin, surface‑mount.

• Is it RoHS compliant?

• Yes, RoHS Compliant according to the provided data.

• Is the device active and recommended for new designs?

• Lifecycle status is listed as Active in the provided data. Always confirm current status on onsemi’s official product resources.

• What is the maximum gate-to-source voltage and threshold voltage?

• Not specified in the provided data. Consult the datasheet for absolute maximum Vgs, Vgs(th), and recommended drive levels.

• Is it logic‑level drive compatible at 1.8 V or 3.3 V?

• Not specified in the provided data. Check the Rds(on) versus Vgs curves in the datasheet to confirm suitability at your drive voltage.

• What is the pinout?

• The device is a 3‑pin SOT‑723; specific pin assignment (Gate/Source/Drain) is not provided here. Refer to the datasheet for the exact pin configuration and recommended land pattern.

Resources

• Datasheet (onsemi): https://www.onsemi.com/pdf/datasheet/ntk3139p-d.pdf
• Product page: Not specified in provided data

The onsemi NTK3139PT1G delivers a strong blend of size, simplicity, and efficiency for portable and battery‑powered electronics. Use the official datasheet to lock down gate‑drive conditions, thermal limits, and pin assignments, and you’ll have a compact, robust high‑side switch ready for modern, space‑constrained designs.