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

Diodes Incorporated BSS123W-7

Name: BSS123W-7
Brand: Diodes Incorporated
SKU: BSS123W-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSS123W-7

Manufacturer:: Diodes Incorporated

Category:: FETs, MOSFETs

Package:: SC-70, SOT-323

Datasheet:: BSS123W-7.pdf

Description:: MOSFET N-CH 100V 170MA SOT323

Quantity:: RFQ Add To RFQ list

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Inventory:9,974

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Product details

Overview

BSS123W-7 from Diodes Incorporated is an N-channel enhancement-mode MOSFET in SOT323 package, rated for 100V V_DSS, 6.0Ω R_DS(ON) at V_GS = 10V, and 170mA continuous drain current at T_A = +25°C. It serves as a low-power switching device in gate drivers, small servo motor controls, and discrete load switching circuits.

For engineers reviewing the BSS123W-7 datasheet, BSS123W-7 pinout, BSS123W-7 application, or BSS123W-7 equivalent, key selection criteria include its low gate threshold (0.8–2.0V), fast switching times (t_r = 8ns, t_f = 16ns), low input capacitance (C_iss = 29–60pF), and AEC-Q qualified automotive-compliant variant (BSS123WQ).

Technical Context

This MOSFET employs a planar silicon process optimized for high-voltage tolerance and low gate charge. Its 100V drain-source breakdown voltage and ±20V gate-source rating support robust operation in 24V and 48V industrial control rails.

The device features low R_DS(ON) with minimal temperature drift (R_DS(ON) normalized to 1.6× at 150°C), low leakage (<10nA I_DSS at V_DS = 20V), and fast turn-on/turn-off delay (t_D(ON) = 8ns, t_D(OFF) = 13ns) - enabling efficient PWM-based power management in space-constrained designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	100V - supports operation in 24V/48V systems with ≥2× safety margin against transients
R_DS(ON)	6.0Ω @ V_GS = 10V - enables <170mW conduction loss at 170mA, suitable for low-duty-cycle switching
I_D (continuous)	170mA @ T_A = +25°C - defines maximum steady-state load current without heatsinking
V_GS(th)	0.8–2.0V - ensures reliable turn-on with 3.3V or 5V logic-level gate drive
C_iss	29–60pF - minimizes gate drive power and improves switching efficiency at >100kHz frequencies
t_r/t_f	8ns / 16ns - supports clean edge transitions in digital load switching and gate driver stages
P_D	200mW - limits thermal rise to ≤125°C junction temperature on FR-4 PCB with standard pad layout

Pinout & Package

Package: SOT323 - ultra-small surface-mount plastic package (2.15 × 2.10 × 0.95 mm), moisture sensitivity level 1, lead-free and RoHS 3 compliant.

Pin/Terminal	Circuit Role	Design Meaning
Drain (D)	High-side or low-side current path terminal	Connected to load or supply rail; handles full switched current and 100V blocking capability
Source (S)	Reference node for gate control and current return	Typically tied to ground or low-side reference; forms common node with gate drive return path
Gate (G)	Control electrode for channel modulation	Requires <50nA leakage drive; sensitive to ESD; driven by microcontroller GPIO or dedicated driver

Key Features

Feature	Design Value
Low gate threshold voltage	0.8–2.0V range enables direct interface with 3.3V/5V logic without level-shifting circuitry
Fast switching speed	8ns rise / 16ns fall time reduces switching losses in PWM applications up to 500kHz
Low input capacitance	29–60pF C_iss lowers required gate drive current and simplifies driver selection
High reliability qualification	AEC-Q qualified variant (BSS123WQ) confirms suitability for automotive subsystems per JEDEC standards
Green packaging	Halogen- and antimony-free molding compound (<900ppm Br+Cl, <1000ppm Sb) meets global environmental compliance mandates

Applications

Small Servo Motor Control

Power MOSFET Gate Driver

Use Scenario: Driving 12V/24V brushed DC servo motors in robotics and actuation modules where compact size and low standby current are critical.

IC Role / Device Role / Timing Role: Low-side switch controlling motor winding current; operates in linear or PWM mode with duty cycle <30%.

Use Value: 170mA rating and 6.0Ω R_DS(ON) limit conduction loss to <175mW, minimizing thermal stress in sealed enclosures.

Use Scenario: Level-shifting and buffering gate signals for high-voltage power MOSFETs or IGBTs in motor drives and SMPS.

IC Role / Device Role / Timing Role: Discrete buffer stage isolating MCU GPIO from high dV/dt gate nodes; switches at ≤1MHz.

Use Value: Fast 8ns/16ns switching and low C_iss ensure minimal propagation delay and reduced gate drive power consumption.

LED Load Switching

Industrial Sensor Interface

Use Scenario: Enabling/disabling LED strings or indicator banks in programmable logic controllers and HMI panels.

IC Role / Device Role / Timing Role: High-side or low-side load switch controlled by FPGA or microcontroller; operated in on/off mode only.

Use Value: 100V V_DSS accommodates 48V bus systems; <10nA I_DSS ensures negligible dark-current leakage during off-state.

Use Scenario: Isolating analog sensor outputs (e.g., thermistors, RTDs) from shared supply rails in multi-sensor industrial nodes.

IC Role / Device Role / Timing Role: Analog multiplexer enable switch; biased in linear region for low-distortion signal pass-through.

Use Value: Low R_DS(ON) variation over temperature (±20% from −55°C to +125°C) maintains consistent sensor bias accuracy.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DMN2004LK-7	R_DS(ON) = 3.5Ω @ V_GS = 4.5V; higher ID (300mA); same SOT323 package	Better suited for higher-current loads (>200mA) but requires tighter gate drive margin due to V_GS(th) = 1.0–2.5V	Select when lower conduction loss at 3.3V drive is prioritized over absolute voltage rating margin
2N7002K-7	V_DSS = 60V; R_DS(ON) = 3.0Ω @ V_GS = 10V; lower cost; widely available	Limited to ≤60V systems; not AEC-Q qualified; higher leakage (I_DSS ≤ 1µA)	Choose for cost-sensitive non-automotive applications where 100V rating is unnecessary

Compared with DMN2004LK-7 and 2N7002K-7, the BSS123W-7 provides superior 100V blocking capability and tighter gate threshold distribution (0.8–2.0V), making it preferred for 24V/48V industrial control and automotive-qualified designs requiring robust transient immunity.

Availability

BSS123W-7 is available at Aetrix Electronics and suitable for small servo motor controls, power MOSFET gate drivers, and LED load switching applications requiring stable component supply and long-term manufacturability.

Supply support for BSS123W-7 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, specializing in high-reliability, industry-qualified components for automotive, industrial, and consumer markets.

The BSS123W belongs to Diodes' general-purpose power MOSFET product line, designed specifically for low-power switching and interface applications where compact size, low gate drive demand, and AEC-Q scalability are essential.

FAQ

What is the maximum operating temperature for BSS123W-7?

The BSS123W-7 has a junction temperature range of −55°C to +150°C and an ambient operating range of −55°C to +150°C. Its thermal resistance R_θJA is 625°C/W on FR-4 board, meaning it dissipates 200mW at +25°C ambient before reaching 150°C junction temperature. Derating is required above +25°C ambient per Figure 6 in the datasheet.

Can BSS123W-7 be used with 3.3V microcontroller GPIOs?

Yes - its gate threshold voltage ranges from 0.8V to 2.0V, ensuring reliable turn-on with 3.3V logic. At V_GS = 3.3V, R_DS(ON) is typically ~8.5Ω (interpolated from Fig. 2), supporting ~120mA continuous current with acceptable conduction loss. No external level shifter is needed.

Is there an automotive-qualified version of BSS123W-7?

Yes - the BSS123WQ is the AEC-Q200 qualified variant, sharing identical electrical specifications and SOT323 package. It undergoes additional stress testing per JEDEC standards and is documented in a separate datasheet (DS30368Q). Both share the same marking code "K23" and date-code format.

What is the moisture sensitivity level (MSL) for BSS123W-7?

The BSS123W-7 is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30°C/60% RH and does not require dry-packaging or baking prior to reflow soldering. This simplifies manufacturing handling and eliminates moisture-related popcorning risk.

BSS123W-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

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:: 60 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 200mW (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

BSS123W-7 FAQ

1.How can I place an order for BSS123W-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS123W-7 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 BSS123W-7 reliable?

The price and inventory of BSS123W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS123W-7 is usually 5 days.

3.What payment methods are accepted for BSS123W-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS123W-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS123W-7?

BSS123W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS123W-7 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 BSS123W-7?

For technical support, including BSS123W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS123W-7 requirements.

6.How does Aetrix verify that BSS123W-7 is sourced from the original manufacturer or authorized distributors?

All BSS123W-7 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 BSS123W-7 meets industry standards.

7.What is the process for return or replacement of BSS123W-7?

All BSS123W-7 units undergo pre-shipment inspection (PSI). If there is an issue with BSS123W-7, 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 BSS123W-7 part is unused and in its original packaging.

Return procedure for BSS123W-7:

1.Submit a request within 90 days.

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

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