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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Nexperia USA Inc. NX138BKWF

Name: NX138BKWF
Brand: Nexperia USA Inc.
SKU: NX138BKWF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NX138BKWF

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: SC-70, SOT-323

Datasheet:: NX138BKWF.pdf

Description:: MOSFET N-CHANNEL 60V 210MA SC70

Quantity:: RFQ Add To RFQ list

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Product details

Overview

NX138BKWF from Nexperia is a 60 V, N-channel enhancement-mode Trench MOSFET in SOT323 (SC-70) package, designed for low-side switching with 2.1 Ω R_DS(on) at V_GS = 10 V and I_D = 200 mA, 210 mA continuous drain current at 25 °C ambient, and ESD protection >2 kV HBM - deployed in relay drivers and high-speed line drivers.

For engineers reviewing the NX138BKWF datasheet, NX138BKWF pinout, NX138BKWF application, or NX138BKWF equivalent, this device supports compact, low-power switching where fast turn-on (8 ns t_d(on)) and low gate charge (0.5 nC Q_G(tot)) are critical for efficiency in space-constrained PCB layouts.

Technical Context

This MOSFET uses Trench technology to achieve low threshold voltage (0.5–1.5 V V_GS(th)) and stable R_DS(on) over temperature - enabling reliable operation in ambient ranges from –55 °C to 150 °C. Its 3.1 pF C_oss and 20 pF C_iss support high-frequency switching up to several MHz in low-power digital load control.

The device operates as a single N-channel switch with no integrated body diode optimization - its source-drain diode exhibits V_SD = 0.9–1.2 V at I_S = 200 mA, and thermal resistance R_th(j-a) is 410–470 K/W on standard FR4, limiting sustained power dissipation to 266 mW at 25 °C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	60 V maximum - supports rail voltages up to 48 V DC systems with margin for transients.
R_DS(on)	2.1 Ω typical at V_GS = 10 V, I_D = 200 mA, 25 °C - enables <100 mW conduction loss at 200 mA.
I_D (cont)	210 mA at T_amb = 25 °C - defines maximum steady-state load current on standard FR4 PCB.
Q_G(tot)	0.5 nC typical - reduces gate drive power and enables clean switching with low-value gate resistors.
t_d(on)/t_f	8 ns / 5 ns - supports >10 MHz PWM in low-duty-cycle digital switching applications.
V_GS(th)	0.5–1.5 V - ensures full enhancement with 1.8 V or 3.3 V logic-level microcontrollers.
ESD HBM	>2 kV - provides robustness against handling discharge without external protection.

Pinout & Package

Package: SOT323 (SC-70), 3-lead surface-mount plastic package with 1.35 mm × 1.75 mm footprint and 0.65 mm lead pitch - optimized for automated reflow assembly on dense PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1	G (Gate)	Control terminal requiring ≤0.5 nC total charge to fully enhance; sensitive to ESD but compatible with 1.8 V GPIO.
2	S (Source)	Reference node for gate drive and current return path; tied to system ground in low-side configuration.
3	D (Drain)	High-side connection point for switched load; thermally coupled to PCB pad (1 cm² recommended) for power dissipation.

Key Features

Feature	Design Value
Low threshold voltage	V_GS(th) down to 0.5 V enables direct drive from ultra-low-voltage MCUs (e.g., ARM Cortex-M0+ @ 1.8 V).
Fast switching speed	8 ns turn-on delay + 5 ns fall time allows clean edge transitions in 5–10 MHz digital load control.
Trench MOSFET architecture	Delivers 2.1 Ω R_DS(on) in SC-70 - 30% lower on-resistance than planar equivalents in same package.
ESD-protected gate	HBM rating >2 kV eliminates need for external gate protection in board-level ESD environments (IEC 61000-4-2 Level 2).

Applications

Relay Driver

High-Speed Line Driver

Use Scenario: Driving coil of miniature signal relays (e.g., 5 V, 150 Ω) in industrial I/O modules.

IC Role / Device Role / Timing Role: Low-side switch controlling relay energization/de-energization with precise timing.

Use Value: 8 ns t_d(on) ensures sub-100 ns relay activation latency; 2.1 Ω R_DS(on) limits coil power loss to <70 mW at 200 mA.

Use Scenario: Transmitting TTL/CMOS logic signals across short PCB traces or cables in test equipment.

IC Role / Device Role / Timing Role: Active pull-down element in push-pull or open-drain line driver configurations.

Use Value: 5 ns fall time preserves signal integrity up to 20 Mbps; low C_oss (3.1 pF) minimizes capacitive loading on driven lines.

Low-Side Load Switch

Switching Power Supply Sync Rectifier

Use Scenario: Enabling/disabling 3.3 V or 5 V peripheral rails in battery-powered IoT nodes.

IC Role / Device Role / Timing Role: Controlled power path switch with logic-level enable input.

Use Value: 0.5 V V_GS(th) ensures full turn-on with 1.8 V enable signals; 210 mA rating covers most sensor/LED loads.

Use Scenario: Secondary-side synchronous rectification in isolated DC-DC converters (<5 W output).

IC Role / Device Role / Timing Role: Unidirectional power switch replacing Schottky diode in flyback or forward topologies.

Use Value: 2.1 Ω R_DS(on) cuts conduction loss by >40% vs. 0.3 V Schottky at 200 mA; fast switching avoids shoot-through in gate-timed designs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel low-voltage switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DMN2004K-7	R_DS(on) = 1.8 Ω @ V_GS = 4.5 V; higher ID (300 mA); SOT-23 package (larger footprint)	Better drive margin at 3.3 V logic; requires more PCB area and higher thermal mass	Select when 3.3 V gate drive is used and board space permits larger SOT-23
PMZB390UNE	V_GS(th) = 0.5–1.1 V; R_DS(on) = 2.4 Ω @ 10 V; 200 mA I_D; same SOT323 package	Near-identical footprint and threshold, but slightly higher on-resistance and lower current rating	Use as drop-in replacement where 2.4 Ω R_DS(on) is acceptable and sourcing flexibility is needed

Compared with DMN2004K-7 and PMZB390UNE, NX138BKWF offers the best balance of ultra-low V_GS(th), SC-70 footprint, and 210 mA rating - making it optimal for 1.8 V–3.3 V logic-driven, space-constrained low-side switches where thermal budget is tight.

Availability

NX138BKWF is available at Aetrix Electronics and suitable for relay drivers, high-speed line drivers, and low-side loadswitches requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for NX138BKWF 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices - delivering energy-efficient, robust components for automotive, industrial, and consumer markets.

NX138BKWF belongs to Nexperia's TrenchMOS portfolio, engineered specifically for low-voltage, low-power switching in space-constrained applications where fast response, low gate drive demand, and small-footprint reliability are essential.

FAQ

What is the maximum continuous drain current for NX138BKWF at 100 °C ambient?

The maximum continuous drain current is 135 mA at T_amb = 100 °C, per the limiting values table. This derating reflects thermal resistance limitations on standard FR4 PCBs - actual current capability depends on copper area, airflow, and layout; use thermal simulation or measurement for design validation.

Can NX138BKWF be driven directly by a 1.8 V microcontroller GPIO?

Yes - its V_GS(th) range (0.5–1.5 V) ensures full enhancement at 1.8 V, and R_DS(on) remains ≤3.5 Ω at V_GS = 1.8 V (per Fig. 9 extrapolation). Gate capacitance is low (20 pF C_iss), so standard GPIOs can drive it without external buffers.

Is NX138BKWF qualified for automotive applications?

No - NX138BKWF is not AEC-Q101 qualified and lacks automotive-grade screening, temperature testing, or failure analysis reporting. It is intended for industrial, consumer, and computing applications only; automotive use requires explicit qualification and validation by the customer.

What is the safe operating area (SOA) limitation at DC operation?

At DC, the SOA is bounded by P_tot = 266 mW at 25 °C ambient (derated to 0 W at 150 °C junction), corresponding to ~200 mA at 1.3 V V_DS. The device must be operated within the normalized power curve (Fig. 1) - exceeding this risks thermal runaway due to R_DS(on) positive temperature coefficient.

NX138BKWF Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 60 V

Current - Continuous Drain (Id) @ 25°C:: 210mA (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 2.5V, 10V

Rds On (Max) @ Id, Vgs:: 3.5Ohm @ 200mA, 10V

Vgs(th) (Max) @ Id:: 1.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 0.7 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 20 pF @ 30 V

FET Feature:: -

Power Dissipation (Max):: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

NX138BKWF FAQ

1.How can I place an order for NX138BKWF through Aetrix?

Please submit a Request for Quotation (RFQ) for NX138BKWF 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 NX138BKWF reliable?

The price and inventory of NX138BKWF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NX138BKWF is usually 5 days.

3.What payment methods are accepted for NX138BKWF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NX138BKWF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NX138BKWF?

NX138BKWF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NX138BKWF 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 NX138BKWF?

For technical support, including NX138BKWF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NX138BKWF requirements.

6.How does Aetrix verify that NX138BKWF is sourced from the original manufacturer or authorized distributors?

All NX138BKWF 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 NX138BKWF meets industry standards.

7.What is the process for return or replacement of NX138BKWF?

All NX138BKWF units undergo pre-shipment inspection (PSI). If there is an issue with NX138BKWF, 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 NX138BKWF part is unused and in its original packaging.

Return procedure for NX138BKWF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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