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

Infineon Technologies BSS209PW

Name: BSS209PW
Brand: Infineon Technologies
SKU: BSS209PW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSS209PW

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: SC-70, SOT-323

Datasheet:: BSS209PW.pdf

Description:: MOSFET P-CH 20V 580MA SOT323-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BSS209PW from Infineon Technologies is a P-channel enhancement-mode MOSFET in SOT-323 package, rated for −20 V V_DS, 550 mΩ R_DS(on) at −4.5 V V_GS, and −0.58 A continuous drain current. It features Super Logic Level gate drive (2.5 V rated), avalanche rating, and 150 °C operation-used in compact DC-DC load switches and battery protection circuits.

For engineers reviewing the BSS209PW datasheet, BSS209PW pinout, BSS209PW application, or BSS209PW equivalent, key selection criteria include logic-level gate compatibility, low R_DS(on) at 2.5 V, thermal performance in SMT space-constrained layouts, and robustness against unclamped inductive switching.

Technical Context

This device implements a trench-based OptiMOS™-P structure optimized for low gate charge (Q_g = 0.92–1.38 nC) and fast switching (t_r = 5.8–8.7 ns, t_f = 4.5–6.7 ns). Its −1.7 V gate plateau voltage enables stable turn-on under low-voltage control.

The integrated body diode exhibits t_rr = 9–11.2 ns and Q_rr = 1.27–1.59 nC, supporting synchronous rectification in high-frequency buck converters where reverse recovery loss must be minimized.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	−20 V - supports rail-to-rail operation in 12 V and lower automotive/battery systems
R_DS(on) @ V_GS = −4.5 V	550 mΩ max - ensures <120 mW conduction loss at −0.58 A, critical for thermally limited PCBs
I_D (continuous)	−0.58 A @ T_A = 25 °C - defines safe steady-state current in ambient-limited SOT-323 footprint
E_AS	3.5 mJ - enables reliable operation in inductive load switching without external snubbers
dv/dt rating	−6 kV/µs - suppresses false turn-on during high-slew-rate transients in motor drivers
Q_g	0.92–1.38 nC - reduces gate driver power and allows use with low-current microcontroller GPIOs
T_j range	−55 to +150 °C - qualified for under-hood automotive and industrial environments

Pinout & Package

SOT-323 (SC-70) surface-mount package with 3 terminals: ultra-compact 2.1 × 2.0 × 0.9 mm footprint, single-row gull-wing leads, JEDEC-compliant soldering profile.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Gate	Logic-level input; requires no level-shifting when driven by 2.5 V–3.3 V MCUs
Pin 2	Source	Common return node; tied to system ground or battery negative in high-side switch configurations
Pin 3	Drain	Switched output; connects to load; exposed pad not present-thermal path relies on PCB copper area

Key Features

Feature	Design Value
Super Logic Level gate	Specified R_DS(on) at V_GS = −2.5 V (max 900 mΩ), enabling direct drive from low-voltage I/O
Avalanche rated	Single-pulse E_AS = 3.5 mJ validated per JEDEC JESD24-11, eliminating need for external clamping
dv/dt immune	Rated −6 kV/µs-prevents spurious turn-on in noisy motor or relay drive environments
High-temperature operation	Guaranteed functionality up to T_j = +150 °C, supporting sealed enclosure designs

Applications

Battery Protection Circuit

USB Power Switch

Use Scenario: Reverse polarity and overcurrent protection in portable Li-ion battery packs.

IC Role / Device Role / Timing Role: High-side load switch controlling battery discharge path with fast fault response.

Use Value: Low R_DS(on) minimizes voltage drop across protection FET, preserving runtime; avalanche rating absorbs inductive kickback from protection IC's internal sense resistor.

Use Scenario: Hot-swap control of USB VBUS in embedded host devices.

IC Role / Device Role / Timing Role: Load switch isolating downstream peripherals during insertion/removal.

Use Value: 2.5 V logic compatibility allows direct MCU GPIO control; fast turn-off (t_f ≤ 6.7 ns) limits inrush current overshoot during plug events.

Low-Voltage DC-DC Enable

Automotive Door Module

Use Scenario: Enabling/disabling 3.3 V or 5 V buck converter outputs in always-on subsystems.

IC Role / Device Role / Timing Role: Precision enable switch placed between controller EN pin and system rail.

Use Value: Gate threshold (−0.6 to −1.2 V) ensures clean logic transition; low leakage (I_DSS ≤ −1 µA @ 150 °C) prevents unintended wake-up in sleep mode.

Use Scenario: Window lift motor direction control and mirror actuator sequencing.

IC Role / Device Role / Timing Role: Half-bridge high-side switch in H-bridge driver stage.

Use Value: −6 kV/µs dv/dt immunity prevents shoot-through during PWM commutation; 150 °C rating matches under-dash ambient requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DMG2305UVT-7	R_DS(on) = 48 mΩ @ −4.5 V (lower), but V_DS = −20 V same; SOT-523 (smaller footprint, higher thermal resistance)	Better conduction efficiency in high-current, short-duration loads; less suitable for sustained 0.5 A due to thermal limits	Select if board space is critical and peak current dominates thermal design
SI2301DS-T1-E3	R_DS(on) = 115 mΩ @ −4.5 V (higher); V_GS(th) = −0.4 to −1.0 V (wider spread); no avalanche rating	Lower cost alternative where unclamped inductive energy is absent and tighter V_GS(th) tolerance is not required	Select for cost-sensitive consumer electronics with benign load profiles

Compared with DMG2305UVT-7 and SI2301DS-T1-E3, the BSS209PW uniquely balances avalanche ruggedness, 2.5 V logic compatibility, and SOT-323 manufacturability-making it optimal for automotive-grade load switching where reliability under transient stress is non-negotiable.

Availability

BSS209PW is available at Aetrix Electronics and suitable for battery management systems, USB power delivery modules, always-on IoT sensor nodes, and automotive body electronics requiring stable component supply across extended temperature ranges.

Supply support for BSS209PW 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 AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs, with global manufacturing and quality certification to AEC-Q101 and IATF 16949.

The BSS209PW belongs to Infineon's OptiMOS™-P small-signal MOSFET product line, engineered for logic-level switching in space-constrained, thermally demanding applications such as automotive door modules and portable power systems.

FAQ

Is BSS209PW suitable for high-side switching in 12 V automotive systems?

Yes. With −20 V V_DS, 150 °C T_j rating, and −6 kV/µs dv/dt immunity, it operates reliably in 12 V nominal systems subject to load dump and cold-crank transients. Its gate threshold (−0.6 to −1.2 V) ensures full enhancement even with degraded battery voltage.

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

The datasheet specifies −0.46 A continuous drain current at T_A = 70 °C with standard SOT-323 mounting on FR4 PCB. This derating reflects thermal resistance R_thJA = 240 K/W at minimum footprint, and assumes no forced airflow or additional copper area.

Does BSS209PW have an integrated ESD protection diode on the gate?

No. The device does not include on-chip gate ESD protection. External 10 kΩ series gate resistor and optional 10 V Zener clamp between gate and source are recommended for handling >2 kV HBM events in automated assembly or field-replaceable modules.

Can BSS209PW replace BSS138 in existing designs?

No. BSS138 is an N-channel MOSFET (V_DS = 50 V, R_DS(on) ≈ 3.5 Ω), while BSS209PW is P-channel with opposite polarity, lower voltage rating, and sub-ohm R_DS(on). Direct replacement would invert logic and violate voltage ratings; circuit topology must be re-evaluated.

BSS209PW Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: OptiMOS™

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: P-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 20 V

Current - Continuous Drain (Id) @ 25°C:: 580mA (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 2.5V, 4.5V

Rds On (Max) @ Id, Vgs:: 550mOhm @ 580mA, 4.5V

Vgs(th) (Max) @ Id:: 1.2V @ 3.5µA

Gate Charge (Qg) (Max) @ Vgs:: 1.38 nC @ 4.5 V

Vgs (Max):: ±12V

Input Capacitance (Ciss) (Max) @ Vds:: 89.9 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 520mW (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT323

BSS209PW FAQ

1.How can I place an order for BSS209PW through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS209PW 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 BSS209PW reliable?

The price and inventory of BSS209PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS209PW is usually 5 days.

3.What payment methods are accepted for BSS209PW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS209PW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS209PW?

BSS209PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS209PW 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 BSS209PW?

For technical support, including BSS209PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS209PW requirements.

6.How does Aetrix verify that BSS209PW is sourced from the original manufacturer or authorized distributors?

All BSS209PW 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 BSS209PW meets industry standards.

7.What is the process for return or replacement of BSS209PW?

All BSS209PW units undergo pre-shipment inspection (PSI). If there is an issue with BSS209PW, 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 BSS209PW part is unused and in its original packaging.

Return procedure for BSS209PW:

1.Submit a request within 90 days.

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

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