Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Diodes Incorporated BSS123ATA

Name: BSS123ATA
Brand: Diodes Incorporated
SKU: BSS123ATA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BSS123ATA

Manufacturer:: Diodes Incorporated

Category:: FETs, MOSFETs

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

Datasheet:: BSS123ATA.pdf

Description:: MOSFET N-CH 100V 170MA SOT23-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:9,090

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BSS123ATA from Diodes Incorporated is an N-channel enhancement-mode vertical DMOS FET in SOT-23 package, rated for 100 V drain-source voltage, 170 mA continuous drain current, and 6–10 Ω R_DS(on) at V_GS = 4.5–10 V; used in low-power load switching and signal-level logic interface circuits.

For engineers reviewing the BSS123ATA datasheet, BSS123ATA pinout, BSS123ATA application, or BSS123ATA equivalent, key selection criteria include verified V_GS(th) range (0.5–2.0 V), pulsed switching performance (t_d(on) = 10 ns, t_f = 25 ns), and thermal capability (T_j = –55 to +150 °C) in compact SOT-23 footprint.

Technical Context

This discrete MOSFET operates in enhancement mode with a vertically structured DMOS cell, enabling higher breakdown voltage and lower on-resistance per unit area than planar counterparts. Its gate threshold voltage range (0.5–2.0 V) supports direct interfacing with 3.3 V and 5 V logic families without level shifting.

Switching behavior is characterized under defined test conditions: 30 V V_DD, 280 mA I_D, 50 Ω source impedance, and sub-5 ns pulse rise time. Capacitance parameters (C_iss = 25 pF, C_oss = 9 pF, C_rss = 4 pF) reflect its suitability for high-frequency switching up to several MHz in low-power DC-DC and LED driver stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	100 V - supports operation across industrial 24 V and telecom 48 V supply rails with margin
I_D (continuous)	170 mA - sufficient for driving small relays, LEDs, or logic inputs in space-constrained designs
R_DS(on)	6–10 Ω - enables <170 mW conduction loss at 170 mA, critical for thermally limited SOT-23 layouts
V_GS(th)	0.5–2.0 V - ensures reliable turn-on from 3.3 V microcontroller GPIOs without external bias
t_f	25 ns - limits switching losses in PWM frequencies up to ~10 MHz in low-duty-cycle applications
T_j range	–55 to +150 °C - qualified for automotive under-hood and industrial control environments

Pinout & Package

SOT-23 package: surface-mount, 3-terminal plastic case with gull-wing leads; standardized footprint per JEDEC TO-236AB; thermal pad not present; maximum PCB trace width recommendation: 0.3 mm for 170 mA routing.

Pin/Terminal	Circuit Role	Design Meaning
1 (Source)	Current return path for channel conduction	Connected to system ground or low-side reference; internal bond wire limits surge current handling
2 (Gate)	Control electrode for channel inversion	High-impedance input requiring <50 nA leakage management; sensitive to ESD per ±20 V rating
3 (Drain)	Output terminal for switched load connection	Rated for 100 V transient spikes; requires layout clearance >0.25 mm to adjacent traces

Key Features

Feature	Design Value
Vertical DMOS structure	Enables 100 V BVDSS in SOT-23 without compromising R_DS(on) or capacitance vs. planar alternatives
Low V_GS(th) range	Guarantees turn-on with standard 3.3 V logic outputs, eliminating need for gate boosters
Pulsed current rating	IDM = 680 mA allows short-duration inrush current handling (e.g., capacitor charging, solenoid pull-in)
Low Crss / Ciss ratio	Crss/Ciss = 0.16 reduces Miller effect, improving gate drive efficiency in high-speed switching

Applications

LED Indicator Control

Microcontroller GPIO Expander

Use Scenario: Driving 20 mA status LEDs from 3.3 V MCU pins with minimal board area.

IC Role / Device Role / Timing Role: Low-side switch controlled by GPIO; no timing-critical function.

Use Value: V_GS(th) ≤ 2.0 V ensures full enhancement at 3.3 V; R_DS(on) ≤ 10 Ω limits LED series resistor to 150 Ω for 20 mA at 3.3 V.

Use Scenario: Extending digital output count of an STM32L0 using discrete FETs as parallel drivers.

IC Role / Device Role / Timing Role: Logic-level buffer with fast edge response (t_f = 25 ns) matching MCU output slew rates.

Use Value: C_iss = 25 pF minimizes capacitive loading on MCU pins; SOT-23 footprint aligns with dense QFN MCU layouts.

Low-Power Sensor Biasing

USB Port Power Switch

Use Scenario: Providing regulated 5 V bias to analog sensor ICs with enable/disable control.

IC Role / Device Role / Timing Role: High-side or low-side enable switch; static DC operation with occasional toggling.

Use Value: IDSS ≤ 500 nA prevents sensor supply leakage during disable; T_j range covers extended ambient temperatures in enclosure-mounted sensors.

Use Scenario: Implementing overcurrent-protected USB VBUS switching in portable hubs.

IC Role / Device Role / Timing Role: Load switch with fast fault response; not part of USB protocol stack.

Use Value: P_tot = 360 mW allows 5 V/170 mA operation with 40 °C rise on 2-layer FR4; V_DS = 100 V withstands USB hot-plug transients.

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
DMN2004LK-7	R_DS(on) = 3.5 Ω @ V_GS = 4.5 V; C_iss = 110 pF; SOT-23 package	Lower on-resistance but higher input capacitance; less suitable for high-frequency PWM	Prefer when minimizing conduction loss dominates over switching speed
2N7002K-T1-E3	V_GS(th) = 1.0–2.5 V; R_DS(on) = 5.5 Ω @ V_GS = 10 V; same SOT-23 footprint	Narrower V_GS(th) distribution improves consistency in mass production	Choose for tighter gate threshold control in automated test environments

Compared with DMN2004LK-7 and 2N7002K-T1-E3, BSS123ATA offers the widest V_GS(th) range (0.5–2.0 V) for robust 3.3 V logic compatibility, balanced R_DS(on) and capacitance for mixed-signal timing integrity, and proven thermal stability across –55 to +150 °C.

Availability

BSS123ATA is available at Aetrix Electronics and suitable for LED indicator control, microcontroller GPIO expansion, low-power sensor biasing, and USB port power switching requiring stable component supply and long-term obsolescence management.

Supply support for BSS123ATA 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in Taiwan and China.

The BSS123ATA belongs to Diodes' general-purpose logic-level MOSFET product line, designed specifically for space-constrained, low-power switching in consumer, computing, and industrial control systems where 3.3 V/5 V compatibility and SOT-23 footprint are mandatory.

FAQ

What is the maximum safe gate-source voltage for BSS123ATA?

The absolute maximum V_GS is ±20 V per datasheet specifications. Exceeding this risks irreversible gate oxide damage. For reliable operation, keep V_GS within –12 V to +12 V in normal use, and implement series gate resistors (≥100 Ω) to limit transient current during switching.

Can BSS123ATA be used in high-frequency PWM applications above 1 MHz?

Yes - with measured t_f = 25 ns and C_iss = 25 pF, it supports clean switching up to ~10 MHz in low-duty-cycle, low-current (<100 mA) loads. However, R_DS(on) increases with temperature, so thermal derating must be applied above 50 °C ambient in sustained PWM operation.

Is BSS123ATA RoHS compliant and halogen-free?

Yes - Diodes Incorporated confirms BSS123ATA meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The "A" suffix in the part number denotes compliance with these environmental standards, and material declarations are available via Diodes' official product page.

How does BSS123ATA's R_DS(on) vary with temperature?

R_DS(on) increases approximately linearly with junction temperature: typical value rises from 6 Ω at 25 °C to ~9.5 Ω at 125 °C. This 58% increase must be factored into worst-case power dissipation calculations, especially in sealed enclosures without forced airflow.

BSS123ATA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 100 V

Current - Continuous Drain (Id) @ 25°C:: 170mA (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 4.5V, 10V

Rds On (Max) @ Id, Vgs:: 6Ohm @ 170mA, 10V

Vgs(th) (Max) @ Id:: 2V @ 1mA

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

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 25 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 360mW (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BSS123ATA FAQ

1.How can I place an order for BSS123ATA through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS123ATA 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 BSS123ATA reliable?

The price and inventory of BSS123ATA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS123ATA is usually 5 days.

3.What payment methods are accepted for BSS123ATA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS123ATA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS123ATA?

BSS123ATA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS123ATA 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 BSS123ATA?

For technical support, including BSS123ATA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS123ATA requirements.

6.How does Aetrix verify that BSS123ATA is sourced from the original manufacturer or authorized distributors?

All BSS123ATA 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 BSS123ATA meets industry standards.

7.What is the process for return or replacement of BSS123ATA?

All BSS123ATA units undergo pre-shipment inspection (PSI). If there is an issue with BSS123ATA, 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 BSS123ATA part is unused and in its original packaging.

Return procedure for BSS123ATA:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…