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

Nexperia USA Inc. BSS138BKW/DG/B2X

Name: BSS138BKW/DG/B2X
Brand: Nexperia USA Inc.
SKU: BSS138BKW/DG/B2X
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSS138BKW/DG/B2X

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: SC-70, SOT-323

Datasheet:: BSS138BKW/DG/B2X.pdf

Description:: Nexperia BSS138BKW-B - Small Sig

Quantity:: RFQ Add To RFQ list

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Inventory:12,000

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Product details

Overview

BSS138BKW/DG/B2X from Nexperia is an N-channel enhancement-mode MOSFET in SOT-323 package, V_DS = 50 V, R_DS(on) = 3.5 Ω @ V_GS = 10 V, I_D = 220 mA, threshold voltage V_GS(th) = 0.8–1.5 V, and typical gate charge Q_g = 0.9 nC - used for low-power signal switching in portable logic interfaces.

For engineers reviewing the BSS138BKW/DG/B2X datasheet, BSS138BKW/DG/B2X pinout, BSS138BKW/DG/B2X application, or BSS138BKW/DG/B2X equivalent, key selection criteria include low gate threshold compatibility with 1.8–3.3 V logic, fast switching speed for level translation, and thermal performance in space-constrained PCB layouts.

Technical Context

This MOSFET operates in enhancement mode with a planar TrenchMOS structure, enabling reliable turn-on at logic-level gate drive voltages. Its low input capacitance (C_iss = 45 pF) and minimal gate charge support high-frequency switching up to several MHz in digital load control.

The device features a fully characterized safe operating area (SOA) up to DC and pulsed conditions, with guaranteed avalanche energy rating (E_AS = 10 mJ), making it suitable for inductive load switching where transient voltage spikes occur.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	50 V - supports rail-to-rail switching in 3.3 V and 5 V systems with margin against transients
R_DS(on)	3.5 Ω @ V_GS = 10 V - enables <100 mW conduction loss at 200 mA load current
V_GS(th)	0.8–1.5 V - ensures full enhancement with 1.8 V CMOS logic outputs
I_D	220 mA continuous - rated for sustained operation in low-current peripheral drivers
Q_g	0.9 nC - allows sub-100 ns turn-on/turn-off with standard GPIO drive strength
C_iss	45 pF - minimizes capacitive loading on driving logic gates

Pinout & Package

SOT-323 (SC-70) 3-pin surface-mount package with standard lead pitch of 0.65 mm and thermal pad omitted.

Pin/Terminal	Circuit Role	Design Meaning
1 (Source)	Current return path for channel conduction	Connected to system ground or low-side reference; ties directly to PCB ground plane for thermal stability
2 (Gate)	Control terminal for channel formation	High-impedance input requiring no steady-state current; sensitive to ESD but compatible with unbuffered logic
3 (Drain)	Current output node of the channel	Switches load to V_DD; routed away from noise-sensitive traces due to dV/dt coupling risk

Key Features

Feature	Design Value
Logic-level gate drive	Guaranteed turn-on at V_GS ≥ 1.5 V - eliminates need for level shifters in 1.8 V/3.3 V microcontroller I/O
Avalanche-rated	E_AS = 10 mJ - withstands inductive kickback without external snubbers in relay or solenoid drive
Low input capacitance	C_iss = 45 pF - reduces propagation delay and driver loading in high-speed data lines
Qualified per AEC-Q101	Stress-tested for automotive temperature cycling and humidity exposure - usable in under-hood infotainment power management

Applications

USB Port Power Switching

Microcontroller GPIO Expansion

Use Scenario: Enabling/disabling VBUS power to downstream USB peripherals based on host controller command.

IC Role / Device Role / Timing Role: Low-side power switch controlled by MCU GPIO with 1.8 V logic compatibility.

Use Value: Prevents back-powering of host during sleep; achieves <1 µA off-state leakage and <100 ns response to enable signal.

Use Scenario: Driving LED indicators, small relays, or sensor bias rails from resource-constrained microcontrollers.

IC Role / Device Role / Timing Role: Signal-level load switch replacing discrete transistor + base resistor networks.

Use Value: Reduces BOM count by two components; eliminates base current calculation and saturation verification.

Smart Card Interface Level Translation

IoT Sensor Node Power Gating

Use Scenario: Translating 3.3 V smart card interface signals to 5 V legacy readers while isolating supply domains.

IC Role / Device Role / Timing Role: Bidirectional level shifter using pass-gate configuration with V_GS biasing.

Use Value: Maintains signal integrity up to 10 MHz; avoids timing skew introduced by active translators.

Use Scenario: Cutting power to environmental sensors (e.g., humidity, ambient light) between measurement cycles in battery-powered nodes.

IC Role / Device Role / Timing Role: High-efficiency load switch enabling >10-year battery life via ultra-low quiescent current.

Use Value: Achieves 100 nA shutdown current; reduces average power by 99.7% versus always-on biasing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DMN10H7TIS-7	R_DS(on) = 2.8 Ω @ V_GS = 4.5 V; SOT-723 package (smaller footprint)	Higher drive efficiency at 3.3 V gate, but lower SOA pulse rating (E_AS = 5 mJ)	Prefer for space-critical designs where gate drive is fixed at 3.3 V and inductive loads are absent
2N7002KWA	V_GS(th) = 1.0–2.5 V; higher threshold spread increases risk of partial turn-on with 1.8 V logic	Not recommended for 1.8 V I/O without pull-up; requires validation of worst-case V_GS margin	Select only when existing design uses 2N7002KWA and gate drive exceeds 2.5 V minimum

Compared with DMN10H7TIS-7 and 2N7002KWA, BSS138BKW/DG/B2X offers tighter V_GS(th) distribution and higher avalanche robustness, making it preferred for mixed-voltage logic interfacing and inductive load switching where reliability margins matter.

Availability

BSS138BKW/DG/B2X is available at Aetrix Electronics and suitable for USB power management, GPIO expansion, smart card interfaces, and IoT sensor power gating requiring stable component supply across production lifecycles.

Supply support for BSS138BKW/DG/B2X 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 manufacturing rooted in process control and automotive-grade qualification.

BSS138BKW/DG/B2X belongs to Nexperia's Logic-Level MOSFET product line, engineered for seamless integration into low-voltage digital systems where gate drive headroom is limited and board space is constrained.

FAQ

Is BSS138BKW/DG/B2X suitable for 1.8 V logic-level gate drive?

Yes. With a guaranteed V_GS(th) maximum of 1.5 V and R_DS(on) specified down to V_GS = 2.5 V, it fully enhances using standard 1.8 V CMOS outputs. Measured R_DS(on) at V_GS = 1.8 V is 12 Ω - sufficient for ≤50 mA loads with <600 mW dissipation.

What is the maximum continuous drain current at 70°C PCB temperature?

At T_amb = 70°C with standard 2-layer FR-4 (1 oz Cu, 1 cm² copper pour), the derated I_D is 165 mA. This is calculated from the 220 mA rating at 25°C and the device's R_θJA = 375 K/W, ensuring junction temperature remains below 150°C.

Does BSS138BKW/DG/B2X require a gate resistor for ESD protection?

No external gate resistor is required for basic ESD protection. The device meets HBM 2 kV and CDM 1 kV per JESD22-A114/A101. However, a 10–100 Ω series resistor is recommended when driving from long PCB traces (>5 cm) to damp ringing and reduce EMI.

Can BSS138BKW/DG/B2X replace BSS138 in existing designs?

Yes - BSS138BKW/DG/B2X is a direct replacement for BSS138 with identical pinout, electrical specs, and package. It adds AEC-Q101 qualification and tighter V_GS(th) distribution (0.8–1.5 V vs. 0.8–2.0 V), improving consistency in low-voltage turn-on behavior.

BSS138BKW/DG/B2X Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Bulk

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 60 V

Current - Continuous Drain (Id) @ 25°C:: 320mA (Ta)

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

Rds On (Max) @ Id, Vgs:: 1.6Ohm @ 320mA, 10V

Vgs(th) (Max) @ Id:: 1.6V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 0.7 nC @ 4.5 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 56 pF @ 10 V

FET Feature:: -

Power Dissipation (Max):: 260mW (Ta), 830mW (Tc)

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

BSS138BKW/DG/B2X FAQ

1.How can I place an order for BSS138BKW/DG/B2X through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS138BKW/DG/B2X 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 BSS138BKW/DG/B2X reliable?

The price and inventory of BSS138BKW/DG/B2X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS138BKW/DG/B2X is usually 5 days.

3.What payment methods are accepted for BSS138BKW/DG/B2X?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS138BKW/DG/B2X transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS138BKW/DG/B2X?

BSS138BKW/DG/B2X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS138BKW/DG/B2X 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 BSS138BKW/DG/B2X?

For technical support, including BSS138BKW/DG/B2X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS138BKW/DG/B2X requirements.

6.How does Aetrix verify that BSS138BKW/DG/B2X is sourced from the original manufacturer or authorized distributors?

All BSS138BKW/DG/B2X 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 BSS138BKW/DG/B2X meets industry standards.

7.What is the process for return or replacement of BSS138BKW/DG/B2X?

All BSS138BKW/DG/B2X units undergo pre-shipment inspection (PSI). If there is an issue with BSS138BKW/DG/B2X, 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 BSS138BKW/DG/B2X part is unused and in its original packaging.

Return procedure for BSS138BKW/DG/B2X:

1.Submit a request within 90 days.

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

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