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

Infineon Technologies BSS123L7874XT

Name: BSS123L7874XT
Brand: Infineon Technologies
SKU: BSS123L7874XT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSS123L7874XT

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

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

Datasheet:: BSS123L7874XT.pdf

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

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Product details

Overview

BSS123L7874XT from Infineon Technologies is an N-channel enhancement-mode logic-level SIPMOS small-signal MOSFET with V_DS = 100 V, R_DS(on) ≤ 6 Ω at V_GS = 10 V, I_D = 0.17 A, and gate threshold voltage V_GS(th) = 0.8–2.0 V; used in low-power load switching and level-shifted gate drive circuits for microcontroller outputs.

For engineers reviewing the BSS123L7874XT datasheet, BSS123L7874XT pinout, BSS123L7874XT application, or BSS123L7874XT equivalent, key selection criteria include logic-level gate drive compatibility (V_GS(th) ≤ 2.0 V), 100 V blocking capability, SOT-23 thermal resistance (R_thJA ≤ 350 K/W), and integrated body diode forward voltage (V_SD = 0.85–1.3 V).

Technical Context

This discrete N-channel MOSFET operates in enhancement mode with a logic-compatible gate threshold, enabling direct drive from 3.3 V or 5 V microcontrollers without external level-shifting. Its SIPMOS process delivers stable R_DS(on) over temperature and low gate charge (C_iss = 65–85 pF, C_rss = 4–6 pF) for fast switching in low-duty-cycle applications.

The device integrates a monolithic body diode rated for 0.17 A continuous forward current (I_S) and 0.68 A pulsed (I_SM), with V_SD = 0.85 V typical at I_F = 0.34 A and T_j = 25 °C - suitable for freewheeling in inductive loads like relays and solenoids.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	100 V - supports off-state blocking in 24 V industrial control and 48 V telecom power rails
R_DS(on)	≤ 6 Ω @ V_GS = 10 V, I_D = 0.17 A - ensures < 170 mW conduction loss at max DC current
V_GS(th)	0.8–2.0 V - guarantees turn-on with standard 3.3 V GPIOs, no external bias needed
I_D (continuous)	0.17 A @ T_A = 28 °C - defines safe steady-state load current in SOT-23 package
C_iss	65–85 pF @ V_DS = 25 V - determines gate drive strength requirement for < 10 ns switching
V_SD	0.85–1.3 V @ I_F = 0.34 A - sets freewheeling voltage drop and associated power dissipation
t_d(on)	5–8 ns @ V_DD = 30 V, R_GS = 50 Ω - enables high-frequency PWM control up to ~20 MHz

Pinout & Package

SOT-23 (TO-236) 3-pin plastic surface-mount package with gull-wing leads; compact footprint (2.9 × 1.3 × 1.0 mm), JEDEC-compliant, rated for -55 °C to +150 °C junction operation.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (G)	Gate	Logic-level input controlling channel conduction; requires ≤ 2.0 V to initiate turn-on
Pin 2 (S)	Source	Reference node for gate drive and current return path; tied to ground or low-side reference
Pin 3 (D)	Drain	High-side load connection point; withstands 100 V transient spikes in relay/solenoid drive

Key Features

Feature	Design Value
Logic-level gate drive	V_GS(th) ≤ 2.0 V enables direct interface with 3.3 V/5 V MCUs without level shifters
Low R_DS(on) drift vs. temperature	R_DS(on) increases only ~15% from 25 °C to 125 °C - improves thermal stability in sealed enclosures
Integrated body diode	Rated I_S = 0.17 A, V_SD = 0.85 V typ - eliminates need for external flyback diode in relay drivers
ESD robustness	HBM Class 1 (≥ 2 kV) - survives handling and board assembly without special precautions

Applications

Relay Driver Circuit

Microcontroller GPIO Expander

Use Scenario: Driving 24 V DC coil relays in PLC I/O modules where space and component count are constrained.

IC Role / Device Role / Timing Role: Low-side switch controlling relay coil current; turns on/off within 10 ns to support fast polling cycles.

Use Value: Eliminates discrete base resistor and flyback diode; reduces BOM by 2 parts while maintaining 100 V surge tolerance.

Use Scenario: Extending limited GPIO count of ARM Cortex-M0+ MCU in smart sensor nodes.

IC Role / Device Role / Timing Role: Digital output buffer translating 3.3 V logic to 24 V load switching; driven directly from GPIO without level shifter.

Use Value: Enables 0.17 A per channel at < 1 µA quiescent current - extends battery life in always-on sensing applications.

LED Current Limiter

Power Sequencing Switch

Use Scenario: Constant-current LED string driver in industrial status indicators with 48 V supply rail.

IC Role / Device Role / Timing Role: Linear current regulator using source-degeneration feedback; operates in saturation region with fixed V_GS.

Use Value: Delivers stable 150 mA LED current with ±5% variation across 0–70 °C ambient - no external op-amp required.

Use Scenario: Controlled power-up sequencing of FPGA core and I/O banks in embedded vision systems.

IC Role / Device Role / Timing Role: Delayed enable switch activated by reset controller output; provides 100 ms turn-on delay via RC timing.

Use Value: Prevents inrush current conflicts during multi-rail startup; supports 100 V isolation margin between sequenced domains.

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
DMN2004LK-7	R_DS(on) = 3.5 Ω @ V_GS = 4.5 V (vs. 6 Ω for BSS123); higher C_iss = 100 pF	Better conduction efficiency below 100 mA but slower switching due to higher capacitance	Prefer for low-loss linear regulation; avoid if >5 MHz PWM is required
2N7002K-T1-E3	V_DS = 60 V (vs. 100 V); R_DS(on) = 3 Ω @ V_GS = 10 V; lower cost	Not suitable for 48 V or 24 V systems with surge transients exceeding 60 V	Select only for 5–12 V logic-controlled loads with strict cost targets

Compared with DMN2004LK-7 and 2N7002K-T1-E3, BSS123L7874XT uniquely balances 100 V rating, logic-level gate, and SOT-23 thermal performance - making it optimal for industrial 24/48 V load switching where voltage margin and MCU compatibility are non-negotiable.

Availability

BSS123L7874XT is available at Aetrix Electronics and suitable for relay drivers, GPIO expanders, LED current limiters, and power sequencing switches requiring stable component supply across automotive-grade temperature ranges and long-lifecycle production programs.

Supply support for BSS123L7874XT 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and industrial MOSFETs, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

The SIPMOS® small-signal transistor product line targets space-constrained, logic-driven switching applications - emphasizing low gate threshold, robust SOA, and reliable operation in harsh industrial environments.

FAQ

What is the maximum continuous drain current for BSS123L7874XT at 70 °C ambient?

At T_A = 70 °C, the maximum continuous drain current is derated to approximately 0.11 A, based on the published ID vs. TA curve (Data Sheet 5) and P_tot = 0.36 W at 25 °C with R_thJA ≤ 350 K/W. This reflects thermal limits of the SOT-23 package under natural convection.

Does BSS123L7874XT have avalanche rating?

No, the datasheets do not specify single-pulse or repetitive avalanche energy (E_AS) ratings. The device is characterized for safe operating area (SOA) under resistive and inductive loads but is not qualified for unclamped inductive switching without external protection.

Can BSS123L7874XT be used in linear (ohmic) mode for analog current regulation?

Yes - its R_DS(on) is specified down to V_GS = 4.5 V and exhibits monotonic transfer characteristics (Data Sheet 6). For stable linear operation, maintain V_DS < 10 V and T_j < 125 °C to avoid thermal runaway, with gate drive precision better than ±0.1 V.

Is the marking 'SAs' on the top of the SOT-23 package the full device code?

Yes - 'SAs' is the official top-side laser marking for BSS123, per Infineon's ordering code documentation (Data Sheet 1). It corresponds to the full type designation BSS123 and is used for traceability and visual identification on assembled PCBs.

BSS123L7874XT Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: SIPMOS®

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

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:: 1.8V @ 50µA

Gate Charge (Qg) (Max) @ Vgs:: 2.67 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 69 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:: PG-SOT23

BSS123L7874XT FAQ

1.How can I place an order for BSS123L7874XT through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS123L7874XT 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 BSS123L7874XT reliable?

The price and inventory of BSS123L7874XT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS123L7874XT is usually 5 days.

3.What payment methods are accepted for BSS123L7874XT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS123L7874XT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS123L7874XT?

BSS123L7874XT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS123L7874XT 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 BSS123L7874XT?

For technical support, including BSS123L7874XT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS123L7874XT requirements.

6.How does Aetrix verify that BSS123L7874XT is sourced from the original manufacturer or authorized distributors?

All BSS123L7874XT 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 BSS123L7874XT meets industry standards.

7.What is the process for return or replacement of BSS123L7874XT?

All BSS123L7874XT units undergo pre-shipment inspection (PSI). If there is an issue with BSS123L7874XT, 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 BSS123L7874XT part is unused and in its original packaging.

Return procedure for BSS123L7874XT:

1.Submit a request within 90 days.

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

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