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

Diodes Incorporated BSS123ATC

Name: BSS123ATC
Brand: Diodes Incorporated
SKU: BSS123ATC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSS123ATC

Manufacturer:: Diodes Incorporated

Category:: FETs, MOSFETs

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

Datasheet:: BSS123ATC.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:9,421

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Product details

Overview

BSS123ATC 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 level-shifting circuits in portable instrumentation and USB-powered peripherals.

For engineers reviewing the BSS123ATC datasheet, BSS123ATC pinout, BSS123ATC application, or BSS123ATC equivalent, key selection criteria include verified V_GS(th) range (0.5–2.0 V), pulsed switching performance (t_d(off) = 15 ns), R_DS(on) tolerance at 4.5 V drive, and SOT-23 thermal derating behavior under 360 mW P_tot.

Technical Context

This discrete MOSFET operates in enhancement mode with a vertically oriented DMOS structure optimized for fast switching and low gate charge. Its 0.5–2.0 V gate threshold enables direct interfacing with 3.3 V and 5 V logic without level translation.

Electrical characterization confirms stable 100 V BVDSS with <500 nA IDSS at rated VDS, and measured Ciss = 25 pF and Crss = 4 pF support predictable high-frequency gate drive design in DC-DC bias control and LED dimming paths.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS max	100 V - supports input rails up to 90 V DC after derating
I_D continuous	170 mA - suitable for sub-200 mA load switching with SOT-23 thermal limits
R_DS(on)	6–10 Ω - ensures <1.7 V drop at 170 mA with 10 V gate drive
V_GS(th)	0.5–2.0 V - guarantees turn-on with standard 3.3 V GPIO
C_iss	25 pF - defines gate drive strength requirement for ≤10 ns switching
P_tot	360 mW - sets maximum ambient temperature limit at full I_D

Pinout & Package

SOT-23 plastic surface-mount package with gull-wing leads; 1.3 mm × 2.9 mm footprint, 1.1 mm height, and JEDEC MO-178 compliant outline.

Pin/Terminal	Circuit Role	Design Meaning
1 (Source)	Current return path for channel conduction	Connected to system ground or low-side reference in high-side switch configurations
2 (Gate)	Control electrode for channel formation	Requires <20 V swing; 50 nA leakage allows high-impedance microcontroller drive
3 (Drain)	High-side current output terminal	Rated for 100 V blocking; connects to load or supply rail in low-side switch topology

Key Features

Feature	Design Value
Low gate threshold voltage	0.5–2.0 V enables direct 3.3 V logic-level drive without external level shifter
Fast switching speed	10 ns t_d(on), 25 ns t_f supports >1 MHz PWM in LED and sensor bias control
Low input capacitance	25 pF C_iss reduces gate drive power and simplifies RC timing network design
Robust avalanche rating	100 V BVDSS with <500 nA IDSS at full rating ensures reliable operation under transient overvoltage

Applications

USB Power Switching

Portable Sensor Bias Control

Use Scenario: Enabling/disabling VBUS power to downstream USB peripherals in battery-powered hubs.

IC Role / Device Role / Timing Role: Low-side load switch controlling 5 V/100 mA USB loads with microcontroller GPIO.

Use Value: 0.5–2.0 V V_GS(th) ensures reliable turn-on from 3.3 V MCU pins; 10 Ω R_DS(on) limits voltage drop to <1.7 V at full load.

Use Scenario: Providing adjustable bias current to analog sensors in handheld medical devices.

IC Role / Device Role / Timing Role: Constant-current source configured with external resistor, driven by DAC output.

Use Value: Stable 100 V BVDSS and <500 nA IDSS prevent sensor offset drift during standby; 25 pF C_iss avoids DAC settling interference.

LED Dimming Interface

Microcontroller I/O Protection

Use Scenario: PWM-driven current sink for monochrome status LEDs in industrial HMIs.

IC Role / Device Role / Timing Role: Fast-switching low-side driver synchronized to MCU PWM outputs.

Use Value: 10 ns t_d(on) and 25 ns t_f support clean 100 kHz dimming without visible flicker; SOT-23 footprint saves board space.

Use Scenario: Isolating sensitive MCU I/O pins from external ESD events on front-panel buttons.

IC Role / Device Role / Timing Role: Clamping switch activated only during overvoltage transients via gate coupling.

Use Value: 100 V V_DS rating and ±20 V V_GS withstand capability provide robust protection margin beyond IEC 61000-4-2 Level 4.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DMN2053UVT-7	R_DS(on) = 3.5 Ω @ 4.5 V; higher I_D = 450 mA; same SOT-23-3	Better for >200 mA loads; higher gate charge increases drive demand	Choose when lower conduction loss outweighs gate drive complexity
2N7002K-T1-GE3	V_GS(th) = 1.0–2.5 V; R_DS(on) = 5.5 Ω @ 10 V; lower P_tot = 350 mW	Narrower V_GS(th) range may require tighter gate drive control	Prefer where cost sensitivity dominates over 0.5 V threshold margin

Compared with DMN2053UVT-7 and 2N7002K-T1-GE3, BSS123ATC offers the widest guaranteed V_GS(th) range (0.5–2.0 V) for robust 3.3 V logic compatibility, while maintaining identical SOT-23 footprint and proven 100 V blocking reliability in field-deployed instrumentation.

Availability

BSS123ATC is available at Aetrix Electronics and suitable for USB power switching, portable sensor bias control, and LED dimming interface applications requiring stable component supply across production lifecycles.

Supply support for BSS123ATC 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 BSS123ATC belongs to Diodes' general-purpose logic-level MOSFET product line, engineered for low-voltage, low-current switching in space-constrained portable and industrial electronics.

FAQ

What is the maximum safe operating voltage for BSS123ATC in continuous DC applications?

The absolute maximum drain-source voltage is 100 V, but for reliable long-term operation, design should limit V_DS to ≤80 V under steady-state conditions to maintain margin against transients and temperature-induced derating. The device's 500 nA IDSS at 100 V confirms stable blocking behavior up to its rated limit.

Can BSS123ATC be driven directly from a 3.3 V microcontroller GPIO without a level shifter?

Yes - its guaranteed V_GS(th) range of 0.5–2.0 V ensures full enhancement with 3.3 V gate drive, and R_DS(on) remains ≤10 Ω at V_GS = 4.5 V. Measured g_fs = 80 mS at V_DS = 25 V confirms strong transconductance even near threshold.

How does thermal performance compare between BSS123ATC and similar SOT-23 MOSFETs?

At 360 mW P_tot, BSS123ATC delivers comparable junction-to-ambient thermal resistance (~278 °C/W) to other SOT-23 logic-level FETs. Its vertical DMOS structure improves heat spreading versus planar alternatives, and measured R_DS(on) stability up to +125 °C supports operation in sealed enclosures.

Is BSS123ATC suitable for PWM switching above 100 kHz?

Yes - with t_d(on) = 10 ns, t_f = 25 ns, and C_iss = 25 pF, it supports clean switching up to 2 MHz in low-duty-cycle applications. Gate drive impedance must remain <50 Ω to meet specified timing; layout parasitics dominate performance beyond 500 kHz.

BSS123ATC 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

BSS123ATC FAQ

1.How can I place an order for BSS123ATC through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS123ATC 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 BSS123ATC reliable?

The price and inventory of BSS123ATC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS123ATC is usually 5 days.

3.What payment methods are accepted for BSS123ATC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS123ATC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS123ATC?

BSS123ATC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS123ATC 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 BSS123ATC?

For technical support, including BSS123ATC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS123ATC requirements.

6.How does Aetrix verify that BSS123ATC is sourced from the original manufacturer or authorized distributors?

All BSS123ATC 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 BSS123ATC meets industry standards.

7.What is the process for return or replacement of BSS123ATC?

All BSS123ATC units undergo pre-shipment inspection (PSI). If there is an issue with BSS123ATC, 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 BSS123ATC part is unused and in its original packaging.

Return procedure for BSS123ATC:

1.Submit a request within 90 days.

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

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