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

Nexperia USA Inc. BSS138AK-QR

Name: BSS138AK-QR
Brand: Nexperia USA Inc.
SKU: BSS138AK-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSS138AK-QR

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BSS138AK-QR.pdf

Description:: MOS DISCRETES

Quantity:: RFQ Add To RFQ list

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Inventory:459

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Product details

Overview

BSS138AK-QR from Nexperia is a 60 V, 250 mA N-channel Trench MOSFET in SOT23 package, designed as a logic-level-compatible low-side load switch with AEC-Q101 qualification, 175 °C junction temperature rating, and 2.2 Ω R_DS(on) at V_GS = 10 V for automotive signal switching applications.

For engineers reviewing the BSS138AK-QR datasheet, BSS138AK-QR pinout, BSS138AK-QR application, or BSS138AK-QR equivalent, this device is selected for high-speed line driving, relay control, and thermally constrained PCB layouts requiring ESD-protected, automotive-grade discrete switching with validated SOA at 100 °C ambient.

Technical Context

This MOSFET uses Trench MOSFET technology to achieve low gate charge (0.21–0.315 nC) and fast switching (t_d(on) ≤ 1 ns, t_f ≤ 3 ns), enabling efficient operation in 1–10 MHz digital interface and PWM-driven load circuits. Its gate threshold voltage (0.8–1.5 V) ensures reliable turn-on with 3.3 V and 5 V logic controllers.

The integrated source-drain diode (V_SD = 1.0–1.7 V at I_S = 250 mA) supports bidirectional current handling in level-shifting and clamping roles, while its 500 V HBM ESD rating eliminates external protection in compact sensor node designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	60 V - Supports rail-to-rail switching in 48 V automotive subsystems and industrial 24–48 V power domains without derating.
R_DS(on)	2.2 Ω (typ) at V_GS = 10 V, I_D = 100 mA - Enables <100 mW conduction loss at 100 mA, suitable for thermally limited FR4 PCB layouts.
I_D	250 mA continuous at T_amb = 25 °C - Rated for sustained low-power switching in microcontroller-peripheral interfaces and LED driver stages.
V_GS(th)	0.8–1.5 V - Ensures full enhancement with standard 3.3 V GPIO outputs, eliminating need for level shifters in MCU-driven loads.
Q_G(tot)	0.21–0.315 nC - Reduces gate drive power and enables clean edge transitions in >5 MHz clocked switching nodes.
T_j(max)	175 °C - Validated for under-hood automotive environments and sealed industrial enclosures without active cooling.
ESD Rating	500 V HBM - Permits direct handling and board assembly without ESD mitigation circuitry in production lines.

Pinout & Package

Supplied in SOT23 plastic surface-mounted package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch), optimized for reflow soldering on FR4 PCBs with single-sided copper and 1 cm² drain pad.

Pin/Terminal	Circuit Role	Design Meaning
1 - G	Gate	Control input accepting 0–20 V logic signals; low input capacitance (9 pF C_iss) minimizes driver loading.
2 - S	Source	Reference node tied to system ground or low-side return path; forms cathode of integrated body diode.
3 - D	Drain	Switched output connected to load; thermal pad design allows 1.6 W P_tot when mounted on 1 cm² copper area.

Key Features

Feature	Design Value
Logic-level gate drive	Operates fully enhanced at 3.3 V logic, eliminating external level shifters in MCU- and FPGA-controlled switches.
AEC-Q101 qualification	Validated for automotive use per stress test requirements including HTGB, HTRB, and ESD, supporting ASIL-B system integration.
Trench MOSFET architecture	Delivers lower R_DS(on) and higher transconductance (0.3 S) than planar alternatives, improving efficiency in battery-powered nodes.
Extended thermal range	Junction temperature rated to 175 °C enables deployment in engine control units, motor drivers, and sealed industrial sensors.
Integrated ESD protection	500 V HBM rating permits direct PCB mounting without guard rings or TVS diodes in space-constrained IoT endpoints.

Applications

Automotive Relay Driver

Industrial Sensor Interface

Use Scenario: Driving 12 V/24 V automotive relays in body control modules where MCU GPIOs lack sufficient current.

IC Role / Device Role / Timing Role: Low-side switch controlling relay coil current with fast turn-off (<3 ns fall time) to suppress back-EMF spikes.

Use Value: Eliminates need for discrete flyback diode due to robust 6.6 mJ avalanche energy rating and integrated body diode.

Use Scenario: Isolating analog sensor outputs (e.g., pressure, temperature) from shared MCU ADC inputs in factory automation PLCs.

IC Role / Device Role / Timing Role: Signal-path enable/disable switch with <1 ns turn-on delay to synchronize sampling windows across multi-channel sensors.

Use Value: Sub-1.5 V V_GS(th) ensures compatibility with 3.3 V sensor supply rails and prevents false triggering during brown-out conditions.

USB-C Power Path Control

Smart Home LED Dimming

Use Scenario: Managing VBUS routing between upstream/downstream ports in USB-C PD sink adapters with strict thermal limits.

IC Role / Device Role / Timing Role: Low-R_DS(on) load switch enabling <100 mΩ effective resistance at 100 mA, minimizing voltage drop and heat generation.

Use Value: 2.2 Ω R_DS(on) at 100 mA yields only 22 mW dissipation-well within 390 mW P_tot limit on standard FR4.

Use Scenario: PWM-controlled dimming of 5 V RGB LED strips in battery-powered smart lighting nodes with tight PCB area budgets.

IC Role / Device Role / Timing Role: High-speed low-side switch toggling at 1–5 kHz with minimal gate drive power (0.315 nC Q_G).

Use Value: Fast 3 ns fall time preserves PWM duty cycle fidelity and prevents color shift in multi-channel LED systems.

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 (typ) at V_GS = 4.5 V; no AEC-Q101 qualification; 20 V V_DS rating	Limited to 5 V logic and consumer-grade environments; unsuitable for automotive or 12+ V rail switching	Select only for cost-sensitive non-automotive 3.3 V systems where 20 V headroom suffices.
FDN306P	P-channel, −20 V V_DS, R_DS(on) = 3.5 Ω at V_GS = −4.5 V; requires inverted logic drive	Used in high-side configurations; incompatible with low-side load switch topology without redesign	Choose only when high-side switching is mandatory and gate drive inversion is acceptable.

Compared with DMN2004K-7 and FDN306P, BSS138AK-QR uniquely combines AEC-Q101 qualification, 60 V rating, and logic-level N-channel operation-making it the sole option for automotive 12/24 V low-side switching with 3.3 V MCU control and thermal resilience to 175 °C.

Availability

BSS138AK-QR is available at Aetrix Electronics and suitable for automotive relay drivers, industrial sensor interfaces, USB-C power path control, and smart home LED dimming requiring stable component supply across extended temperature and lifecycle-critical programs.

Supply support for BSS138AK-QR 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, with leadership in automotive-qualified components and advanced packaging.

BSS138AK-QR belongs to Nexperia's AEC-Q101-qualified TrenchMOS portfolio, engineered specifically for robust, low-power switching in automotive body electronics, industrial I/O modules, and portable equipment where logic-level drive and thermal resilience are critical.

FAQ

Is BSS138AK-QR pin-compatible with the standard BSS138?

Yes, BSS138AK-QR shares identical SOT23 pinout (G-S-D), package dimensions, and footprint with BSS138 and BSS138DW. The "-QR" suffix denotes tape-and-reel packaging per AEC-Q101 requirements, with no electrical or mechanical changes affecting layout or interconnect.

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

At T_amb = 100 °C, the maximum continuous drain current is 180 mA, as specified in Table 5 (Limiting Values). This reflects thermal derating due to reduced junction-to-ambient thermal resistance at elevated ambient temperatures.

Does BSS138AK-QR include an integrated body diode, and what are its key parameters?

Yes, it features an integrated source-drain diode with forward voltage V_SD = 1.0–1.7 V at I_S = 250 mA and reverse recovery time t_rr = 7 ns. This enables freewheeling in inductive loads and simplifies flyback protection in relay and solenoid drivers.

Can BSS138AK-QR be used in 1.8 V logic systems?

No-its minimum V_GS(th) is 0.8 V, but full enhancement (low R_DS(on)) requires ≥2.5 V gate drive. At 1.8 V, R_DS(on) rises sharply (>12 Ω), causing excessive conduction loss; it is validated for reliable operation with 3.3 V and 5 V logic families only.

BSS138AK-QR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

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:: 250mA

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

Rds On (Max) @ Id, Vgs:: -

Vgs(th) (Max) @ Id:: -

Gate Charge (Qg) (Max) @ Vgs:: 0.21 nC @ 10 V

Vgs (Max):: 20V

Input Capacitance (Ciss) (Max) @ Vds:: -

FET Feature:: -

Power Dissipation (Max):: -

Operating Temperature:: 175°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BSS138AK-QR FAQ

1.How can I place an order for BSS138AK-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS138AK-QR 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 BSS138AK-QR reliable?

The price and inventory of BSS138AK-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS138AK-QR is usually 5 days.

3.What payment methods are accepted for BSS138AK-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS138AK-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS138AK-QR?

BSS138AK-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS138AK-QR 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 BSS138AK-QR?

For technical support, including BSS138AK-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS138AK-QR requirements.

6.How does Aetrix verify that BSS138AK-QR is sourced from the original manufacturer or authorized distributors?

All BSS138AK-QR 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 BSS138AK-QR meets industry standards.

7.What is the process for return or replacement of BSS138AK-QR?

All BSS138AK-QR units undergo pre-shipment inspection (PSI). If there is an issue with BSS138AK-QR, 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 BSS138AK-QR part is unused and in its original packaging.

Return procedure for BSS138AK-QR:

1.Submit a request within 90 days.

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

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