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

Infineon Technologies BSP129L6906

Name: BSP129L6906
Brand: Infineon Technologies
SKU: BSP129L6906
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSP129L6906

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-261-4, TO-261AA

Datasheet:: BSP129L6906.pdf

Description:: N-CHANNEL POWER MOSFET

Quantity:: RFQ Add To RFQ list

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Inventory:16,000

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Product details

Overview

BSP129L6906 from Infineon Technologies is an N-channel depletion-mode SIPMOS® small-signal transistor in PG-SOT223 package, rated for 240 V V_DS, 6 Ω R_DS(on) max at V_GS = 0 V, and 0.35 A continuous drain current at 25 °C ambient. It features dv/dt immunity up to 6 kV/µs, V_GS(th) band L (−1.5 V to −1.3 V), and is qualified per AEC-Q101 for automotive-grade reliability in high-noise switching applications such as LED load control and relay drivers.

For engineers reviewing the BSP129L6906 datasheet, BSP129L6906 pinout, BSP129L6906 application, or BSP129L6906 equivalent, key selection criteria include its depletion-mode operation enabling fail-safe turn-on without gate bias, dv/dt ruggedness for inductive load commutation, V_GS(th) banding for consistent threshold matching, and SOT223 thermal performance with R_thJS = 25 K/W.

Technical Context

This device operates in depletion mode, meaning it conducts at zero gate-source voltage and requires negative V_GS to pinch off - ideal for high-side switch configurations where gate drive simplicity is critical. Its dv/dt rating of 6 kV/µs ensures robustness against parasitic turn-on during fast voltage transients in inductive circuits.

Electrical behavior is defined by a tightly banded V_GS(th) (band L: −1.5 V to −1.3 V), low input capacitance (C_iss = 82–108 pF), and gate charge parameters (Q_g = 3.8–5.7 nC) optimized for moderate-speed switching with minimal drive power. The integrated body diode supports freewheeling with t_rr = 53–80 ns and Q_rr = 65–97 nC.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS max	240 V - supports 200 V DC bus applications with 20 % margin for transient overvoltage
R_DS(on) max	6 Ω at V_GS = 0 V, I_D = 25 mA - defines on-state power loss in always-on or gate-biased-off configurations
I_D cont	0.35 A at T_A = 25 °C - usable in low-power load switching with PCB copper area ≥6 cm²
dv/dt rating	6 kV/µs - prevents spurious turn-on during rapid voltage slew in relay/inductor snubbing
V_GS(th) band	L (−1.5 V to −1.3 V) - enables predictable turn-off voltage across production lots for stable timing
t_rr	53–80 ns - limits reverse recovery energy loss when used with inductive loads
R_thJS	25 K/W - junction-to-solder-point thermal resistance enables direct thermal coupling to PCB ground plane

Pinout & Package

Package: PG-SOT223 (standardized 4-pin variant with exposed drain pad). Pin 1 = Gate, Pin 2 = Source, Pin 3 = Drain (tab), Pin 4 = Drain (solderable thermal pad). Thermal pad must be soldered for rated R_thJS.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (G)	Gate terminal	Control electrode; negative V_GS required to reduce conduction; high-impedance input (I_GSS ≤ 10 nA)
Pin 2 (S)	Source terminal	Reference node for gate drive; connected to system ground or return path in high-side configuration
Pin 3 (D)	Drain terminal (lead)	Main current-carrying output; electrically tied to thermal pad (Pin 4); handles 240 V blocking and 0.35 A conduction
Pin 4 (D)	Drain thermal pad	Primary heat transfer path to PCB; must be soldered to ≥6 cm² copper for R_thJS = 25 K/W performance

Key Features

Feature	Design Value
Depletion-mode operation	Conducts at V_GS = 0 V - eliminates need for active gate bias in fail-safe "default-on" circuits
V_GS(th) banding (L)	−1.5 V to −1.3 V - tight threshold grouping improves consistency in timing-critical analog switches
dv/dt ruggedness	6 kV/µs - withstands fast voltage transients without false triggering in motor/relay driver stages
AEC-Q101 qualification	Qualified for automotive temperature range (−55 °C to 150 °C) and stress testing - suitable for under-hood ECUs
Integrated body diode	Forward voltage 0.79–1.2 V at 0.35 A - enables self-contained freewheeling without external diode in low-current inductive loads

Applications

Automotive LED Tail Light Control

Industrial Relay Driver

Use Scenario: Switching 12 V/24 V LED arrays in vehicle rear lighting with PWM dimming and short-circuit protection.

IC Role / Device Role / Timing Role: High-side depletion-mode switch providing default-ON behavior during microcontroller boot-up or reset.

Use Value: Eliminates external pull-up resistor and gate driver IC; V_GS(th) banding ensures uniform brightness across multiple channels.

Use Scenario: Driving 12 V coil relays in PLC I/O modules where fast turn-off and EMI resilience are required.

IC Role / Device Role / Timing Role: Snubberless relay driver leveraging dv/dt immunity to suppress contact arcing-induced transients.

Use Value: Reduces need for RC snubbers and TVS clamps; R_DS(on) < 6 Ω limits coil power dissipation below 1 W.

Low-Power AC Zero-Crossing Detector

Fail-Safe Power Sequencing

Use Scenario: Detecting AC line zero-crossing in smart home dimmers using resistive divider + transistor latch.

IC Role / Device Role / Timing Role: Depletion-mode front-end switch biased near V_GS(th) to trigger on rising/falling edges of rectified AC.

Use Value: Enables precise edge detection without auxiliary supply; C_iss < 108 pF minimizes phase shift error.

Use Scenario: Enabling backup power rails in medical devices where main supply failure must activate secondary source within 100 µs.

IC Role / Device Role / Timing Role: Always-conducting switch that turns OFF only upon receipt of active-low disable signal.

Use Value: Guarantees uninterrupted power during brownout; t_f < 53 ns ensures sub-microsecond response to fault signals.

Equivalent & Alternatives

The following parts are listed as comparable options for similar depletion-mode MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BSP129L6327	Same die, identical specs, but V_GS(th) band K (−1.35 V to −1.15 V); same PG-SOT223 package and reel marking	Higher threshold reduces sensitivity to noise in low-voltage gate drive environments	Select when tighter turn-off margin is needed relative to system noise floor
BS170	Discrete N-channel enhancement-mode MOSFET; V_DS = 60 V, R_DS(on) = 5 Ω, no AEC-Q101 qualification	Requires positive gate drive; unsuitable for fail-safe default-on or automotive use	Only acceptable in non-automotive, low-voltage (<60 V), non-safety-critical prototypes

Compared with BSP129L6327, the L6906 offers lower V_GS(th) for earlier turn-on in marginal gate drive conditions; versus BS170, it provides true depletion-mode operation, higher voltage rating, and automotive qualification - making it irreplaceable in safety-aware or high-dv/dt designs.

Availability

BSP129L6906 is available at Aetrix Electronics and suitable for automotive lighting control, industrial relay driving, AC zero-crossing detection, and fail-safe power sequencing requiring stable component supply and traceable AEC-Q101 compliance.

Supply support for BSP129L6906 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 electronics, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

The BSP129 belongs to Infineon's SIPMOS® small-signal transistor product line, designed specifically for robust, low-power switching in automotive and industrial environments where depletion-mode behavior, dv/dt immunity, and AEC-Q101 reliability are mandatory.

FAQ

Is BSP129L6906 pin-compatible with standard SOT-223 footprints?

Yes - BSP129L6906 uses the PG-SOT223 package, which conforms to JEDEC MO-178AB mechanical dimensions and is compatible with standard SOT-223 PCB footprints. Pin 1 (Gate), Pin 2 (Source), and Pin 3 (Drain lead) align identically; Pin 4 is the exposed drain thermal pad, requiring solder mask clearance and thermal via design per Infineon's layout guidelines.

What does the 'L6906' suffix indicate in the part number?

The 'L6906' suffix identifies the V_GS(th) band (L) and reel packaging code (6906), confirming the device is sorted into the −1.5 V to −1.3 V threshold range and supplied in 1000-piece dry-reel format with V_GS(th) band letter printed on the label. This banding enables predictable turn-off voltage across production units.

Can BSP129L6906 be used in linear (analog) amplification?

No - BSP129L6906 is not characterized or specified for linear operation. Its transfer characteristics show significant variation in g_fs and R_DS(on) vs. I_D, and no small-signal gain, linearity, or distortion data is provided. It is intended strictly for switching applications with defined on/off states.

Does BSP129L6906 require a gate resistor for stability?

A gate resistor (typically 10–100 Ω) is recommended to dampen ringing caused by gate-drain capacitance (C_rss = 6–10 pF) and PCB trace inductance, especially in high-dv/dt environments. While not mandatory for basic turn-on/turn-off, it improves EMI performance and prevents oscillation during fast transitions per Infineon's application note AN2015-07.

BSP129L6906 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: SIPMOS®

Package/Case:: TO-261-4, TO-261AA

Packaging:: Bulk

Product Status:: Active

FET Type:: N-Channel, Depletion Mode

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 240 V

Current - Continuous Drain (Id) @ 25°C:: 350mA (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 0V, 10V

Rds On (Max) @ Id, Vgs:: 6Ohm @ 350mA, 10V

Vgs(th) (Max) @ Id:: 1V @ 108µA

Gate Charge (Qg) (Max) @ Vgs:: 5.7 nC @ 5 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 108 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 1.8W (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT223-4-21

BSP129L6906 FAQ

1.How can I place an order for BSP129L6906 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSP129L6906 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 BSP129L6906 reliable?

The price and inventory of BSP129L6906 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSP129L6906 is usually 5 days.

3.What payment methods are accepted for BSP129L6906?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSP129L6906 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSP129L6906?

BSP129L6906 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSP129L6906 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 BSP129L6906?

For technical support, including BSP129L6906 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSP129L6906 requirements.

6.How does Aetrix verify that BSP129L6906 is sourced from the original manufacturer or authorized distributors?

All BSP129L6906 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 BSP129L6906 meets industry standards.

7.What is the process for return or replacement of BSP129L6906?

All BSP129L6906 units undergo pre-shipment inspection (PSI). If there is an issue with BSP129L6906, 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 BSP129L6906 part is unused and in its original packaging.

Return procedure for BSP129L6906:

1.Submit a request within 90 days.

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

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