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

Nexperia USA Inc. BSS138AKS-QX

Name: BSS138AKS-QX
Brand: Nexperia USA Inc.
SKU: BSS138AKS-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSS138AKS-QX

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: -

Datasheet:: BSS138AKS-QX.pdf

Description:: MOS DISCRETES

Quantity:: RFQ Add To RFQ list

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Inventory:25

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Product details

Overview

BSS138AKS-QX from Nexperia is a dual N-channel Trench MOSFET in SOT363 (SC-88) package, rated for 60 V V_DS, 220 mA continuous drain current per transistor at 25 °C, and 2.2 Ω R_DS(on) at V_GS = 10 V and I_D = 100 mA. It serves as a compact, AEC-Q101-qualified low-side load switch or high-speed line driver in automotive and industrial control modules.

For engineers reviewing the BSS138AKS-QX datasheet, BSS138AKS-QX pinout, BSS138AKS-QX application, or BSS138AKS-QX equivalent, this device supports logic-level drive (V_GS(th) typ. 1.1 V), operates up to 175 °C junction temperature, and delivers ESD protection (HBM 500 V) - critical for robust signal switching in space-constrained PCBs.

Technical Context

This dual discrete MOSFET integrates two independent enhancement-mode N-channel channels in a single 6-pin TSSOP6 package. Each channel features trench gate structure enabling low R_DS(on) and fast switching (t_r/t_f ≤ 3 ns), with matched threshold voltage (V_GS(th) = 0.8–1.5 V) and integrated source-drain diodes (V_SD = 1.0–1.7 V at 210 mA).

It operates under AEC-Q101 qualification, supporting automotive ambient ranges (−55 °C to +175 °C) and exhibiting avalanche ruggedness (E_AS = 6.6 mJ). Thermal resistance is optimized for FR4 PCB mounting: R_th(j-a) = 500 K/W (standard footprint) and 450 K/W (with 1 cm² drain pad).

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	60 V - Maximum blocking voltage per transistor; enables use in 24 V automotive and 48 V industrial bus interfaces.
R_DS(on)	2.2 Ω (typ.) at V_GS = 10 V, I_D = 100 mA, T_j = 25 °C - Low conduction loss for efficient low-power switching below 220 mA.
V_GS(th)	1.1 V (typ.) - Ensures reliable turn-on with 1.8 V/3.3 V logic controllers without level-shifting circuitry.
I_D (cont.)	220 mA per transistor at T_amb = 25 °C - Supports driving small solenoids, LEDs, or logic-level relay coils.
ESD Rating	HBM ±500 V - Provides built-in electrostatic immunity during board assembly and handling.
T_j max	175 °C - Enables operation in under-hood automotive environments and sealed industrial enclosures.
Q_G(tot)	0.21 nC (typ.) - Enables fast switching with minimal gate drive power, suitable for >1 MHz PWM applications.

Pinout & Package

SOT363 (SC-88 / TSSOP6) plastic surface-mount package: 6-lead, 0.65 mm pitch, 2.1 mm × 1.25 mm × 0.95 mm body. Designed for reflow and wave soldering with defined footprint per Fig. 19–20.

Pin/Terminal	Circuit Role	Design Meaning
1	S1	Source terminal of transistor 1 - tied to ground or low-side return path in load-switch configuration.
2	G1	Gate terminal of transistor 1 - accepts logic-level input; requires no external gate resistor for <1 MHz switching.
3	D2	Drain terminal of transistor 2 - connects to switched load or signal line; shares thermal pad with D1 in layout.
4	S2	Source terminal of transistor 2 - electrically isolated from S1; enables dual independent low-side switches.
5	G2	Gate terminal of transistor 2 - fully independent control; allows asynchronous or complementary switching.
6	D1	Drain terminal of transistor 1 - routed separately from D2; supports dual-channel routing on dense PCBs.

Key Features

Feature	Design Value
Logic-level gate drive	V_GS(th) ≤ 1.5 V ensures full enhancement with 1.8 V/3.3 V microcontrollers - eliminates level shifters in battery-powered systems.
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD - suitable for engine control and ADAS sensor interfaces.
Trench MOSFET architecture	Delivers 2.2 Ω R_DS(on) in ultra-small SOT363 - reduces board area by >50% vs. discrete SO-8 dual FETs.
Integrated ESD protection	HBM ±500 V rating - removes need for external TVS diodes in low-energy signal paths like I/O expanders or GPIO drivers.
Extended thermal range	Rated for continuous operation from −55 °C to +175 °C junction - supports placement near heat sources without derating penalties.

Applications

Automotive LED Lighting Control

Industrial I/O Expansion Module

Use Scenario: Driving individual LED strings in headlamp or interior lighting modules with PWM dimming.

IC Role / Device Role / Timing Role: Dual low-side switch controlling two independent LED channels; each transistor handles separate current path with independent enable timing.

Use Value: 2.2 Ω R_DS(on) minimizes power loss at 100–200 mA loads; 175 °C rating permits placement near LED heatsinks.

Use Scenario: Isolating and switching 24 V DC field signals (e.g., proximity sensors, limit switches) into PLC input cards.

IC Role / Device Role / Timing Role: Dual-channel level translator and load switch; converts 24 V inputs to 3.3 V logic-compatible signals via open-drain configuration.

Use Value: 60 V V_DS withstands inductive kickback from 24 V solenoids; ESD protection prevents latch-up during field wiring.

USB-C Port Power Switching

Smart Home Relay Driver Board

Use Scenario: Controlling VBUS path and CC line termination in USB-C receptacle circuits requiring dual independent switches.

IC Role / Device Role / Timing Role: Independent control of VBUS discharge path and CC pull-up/down resistors; precise timing coordination enabled by matched V_GS(th).

Use Value: Low Q_G(tot) (0.21 nC) enables fast, glitch-free USB-C attach/detach sequencing without gate driver ICs.

Use Scenario: Driving 5 V/12 V relays in smart home hubs where PCB space and thermal management are constrained.

IC Role / Device Role / Timing Role: Low-side relay coil driver; one channel controls main relay, second handles status indicator LED or auxiliary function.

Use Value: Logic-level compatibility eliminates need for bipolar transistor buffers; 220 mA rating covers standard 5 V relay coils (≈150 mA hold current).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DMN2041LSD-13	Higher R_DS(on) (3.5 Ω @ 4.5 V), same SOT363 package, non-AEC-Q101	Lacks automotive qualification; lower gate drive sensitivity limits use in 1.8 V systems	Select when cost priority outweighs AEC-Q101 compliance and 1.8 V operation is not required.
FDMA1023NZ	Lower V_DS (20 V), higher I_D (600 mA), WDFN package (2×2 mm)	Not pin-compatible; requires PCB redesign; unsuitable for 24 V+ bus applications	Choose only if higher current and smaller footprint justify layout change and voltage derating.

Compared with DMN2041LSD-13 and FDMA1023NZ, the BSS138AKS-QX uniquely balances AEC-Q101 qualification, 60 V capability, and logic-level drive in SOT363 - making it the only drop-in solution for automotive signal switching where voltage margin and qualification are non-negotiable.

Availability

BSS138AKS-QX is available at Aetrix Electronics and suitable for automotive LED control, industrial I/O expansion, USB-C power management, and smart home relay driver applications requiring stable component supply across production lifecycles.

Supply support for BSS138AKS-QX 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 essential efficiency-enhancing components, with leadership in logic, discrete, and MOSFET technologies for automotive, industrial, and mobile markets.

The BSS138AKS-QX belongs to Nexperia's AEC-Q101-qualified TrenchMOS portfolio, engineered specifically for space-constrained, high-reliability low-voltage switching in automotive signal chains and industrial control nodes.

FAQ

Is BSS138AKS-QX pin-compatible with the standard BSS138?

No. The BSS138 is a single-channel SOT23 device, while BSS138AKS-QX is a dual-channel SOT363 package with six pins and independent source/gate/drain terminals per channel. Pin mapping, footprint, and thermal design rules differ fundamentally - direct replacement requires PCB redesign.

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

Per datasheet Table 5, the maximum continuous drain current per transistor is 160 mA at T_amb = 100 °C, assuming standard FR4 PCB mounting. This reflects thermal derating due to reduced heat dissipation at elevated ambient temperatures.

Does BSS138AKS-QX include back-to-back body diodes for bidirectional blocking?

No. Each channel has a single source-drain diode oriented anode-to-source, cathode-to-drain. The device does not provide intrinsic bidirectional blocking; external diodes or topology changes are required for reverse-current protection in AC-coupled or H-bridge applications.

Can BSS138AKS-QX be used in linear (analog) amplifier configurations?

No. Its R_DS(on) variation over V_GS and temperature (Fig. 9–10), lack of guaranteed g_m linearity, and absence of SPICE models for analog operation make it unsuitable for precision amplification. It is specified and qualified exclusively for switching applications.

BSS138AKS-QX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: -

Technology:: -

Drain to Source Voltage (Vdss):: -

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

Drive Voltage (Max Rds On, Min Rds On):: -

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

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

Gate Charge (Qg) (Max) @ Vgs:: -

Vgs (Max):: -

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

FET Feature:: -

Power Dissipation (Max):: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

BSS138AKS-QX FAQ

1.How can I place an order for BSS138AKS-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS138AKS-QX 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 BSS138AKS-QX reliable?

The price and inventory of BSS138AKS-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS138AKS-QX is usually 5 days.

3.What payment methods are accepted for BSS138AKS-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS138AKS-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS138AKS-QX?

BSS138AKS-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS138AKS-QX 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 BSS138AKS-QX?

For technical support, including BSS138AKS-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS138AKS-QX requirements.

6.How does Aetrix verify that BSS138AKS-QX is sourced from the original manufacturer or authorized distributors?

All BSS138AKS-QX 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 BSS138AKS-QX meets industry standards.

7.What is the process for return or replacement of BSS138AKS-QX?

All BSS138AKS-QX units undergo pre-shipment inspection (PSI). If there is an issue with BSS138AKS-QX, 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 BSS138AKS-QX part is unused and in its original packaging.

Return procedure for BSS138AKS-QX:

1.Submit a request within 90 days.

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

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