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

Infineon Technologies BSP129L6906HTSA1

Name: BSP129L6906HTSA1
Brand: Infineon Technologies
SKU: BSP129L6906HTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSP129L6906HTSA1

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

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

Datasheet:: BSP129L6906HTSA1.pdf

Description:: MOSFET N-CH 240V 350MA SOT223-4

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Product details

Overview

BSP129L6906HTSA1 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 ruggedness (6 kV/µs), V_GS(th) band sorting (L-band: −1.5 to −1.35 V), and AEC-Q101 qualification for automotive sensor interface and power switch applications.

For engineers reviewing the BSP129L6906HTSA1 datasheet, BSP129L6906HTSA1 pinout, BSP129L6906HTSA1 application, or BSP129L6906HTSA1 equivalent, key selection criteria include depletion-mode operation enabling normally-on biasing, V_GS(th) band consistency for matched channel control, dv/dt immunity in inductive load switching, and SOT223 thermal performance with 25 K/W R_thJS.

Technical Context

This device operates as a depletion-mode MOSFET: it conducts at V_GS = 0 V and requires negative gate voltage to pinch off. Its 240 V breakdown rating and 6 kV/µs dv/dt capability support high-voltage transient resilience in automotive body electronics and industrial solenoid drivers.

Thermal design relies on its SOT223-4L package with exposed drain pad (Pin 4), delivering 25 K/W junction-to-soldering-point resistance. The L6906 reel marking indicates V_GS(th) band L (−1.5 V to −1.35 V), verified per JESD22-A114-HBM Class 1A ESD rating (>250 V, <500 V).

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	240 V - supports operation up to 240 V DC blocking without avalanche breakdown
R_DS(on) max	6 Ω at V_GS = 0 V, I_D = 25 mA - defines on-state conduction loss in depletion-biased circuits
I_D cont	0.35 A at T_A = 25 °C - maximum steady-state current under natural convection on standard PCB
dv/dt rating	6 kV/µs - enables reliable switching in inductive loads without spurious turn-on
V_GS(th) band	L-band: −1.5 V to −1.35 V - tight threshold grouping for consistent turn-off behavior across production reels
R_thJS	25 K/W - junction-to-soldering-point thermal resistance, critical for thermal modeling of SOT223-4L mounting
Q_g total	3.8–5.7 nC - gate charge magnitude determining drive strength requirements for fast switching

Pinout & Package

Package: PG-SOT223-4L (SMD, 4-pin variant with exposed drain pad on Pin 4). Standard footprint per Infineon outline drawing Rev. 1.42.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Source)	Source terminal	Reference node for gate control; connected to ground or low-side return path
Pin 2 (Gate)	Control input	Accepts negative voltage (≤ −1.35 V) to fully pinch off channel; zero-bias conducts
Pin 3 (Drain)	High-side current path	Carries load current; electrically tied to exposed pad (Pin 4) for thermal and electrical connection
Pin 4 (Drain Pad)	Thermal & electrical drain tie	Exposed copper pad soldered to PCB copper area; primary heat extraction path and low-inductance drain return

Key Features

Feature	Design Value
Depletion-mode operation	Conducts at V_GS = 0 V - eliminates need for active gate bias circuitry in fail-safe or always-on configurations
V_GS(th) band sorting (L6906)	L-band (−1.5 V to −1.35 V) marked on reel label - enables predictable turn-off voltage across production lots
dv/dt ruggedness	6 kV/µs at I_D = 0.36 A, V_DS = 192 V - prevents false triggering during fast voltage transients in relay/solenoid drive
AEC-Q101 qualified	Qualified for automotive temperature range (−55 °C to 150 °C) and mechanical stress - suitable for under-hood body control modules
Pb-free & halogen-free	RoHS-compliant plating and IEC61249-2-21 compliance - meets automotive environmental and assembly requirements

Applications

Automotive Door Lock Actuator Driver

Industrial Solenoid Interface

Use Scenario: Driving 12 V DC solenoids in vehicle door latch mechanisms with reverse battery and load dump immunity.

IC Role / Device Role / Timing Role: Depletion-mode high-side switch enabling default-closed state; gate pulled negative only during unlock pulse.

Use Value: Eliminates external bias supply; dv/dt rating prevents misfire during alternator load dump transients.

Use Scenario: Controlling 24 V industrial pneumatic valves in PLC output stages with inductive kickback suppression.

IC Role / Device Role / Timing Role: Normally-on switch placed between valve coil and ground; gate driven negative to interrupt current.

Use Value: Fast 33 ns t_d(off) and 53 ns t_f enable precise pulse-width control; 240 V V_BR(DSS) withstands flyback spikes.

LED String Bias Controller

Fail-Safe Power Sequencer

Use Scenario: Providing constant-current bias to automotive LED tail-light strings during ignition-on sequencing.

IC Role / Device Role / Timing Role: Depletion-mode current limiter in series with LED string; gate voltage modulated for dimming.

Use Value: R_DS(on) tolerance (6–20 Ω) accommodates process variation while maintaining safe I_DSS ≥ 50 mA at V_GS = 0 V.

Use Scenario: Enabling power to safety-critical subsystems only after MCU validation, with automatic re-enable on reset.

IC Role / Device Role / Timing Role: Always-on power path switch; gate held at −1.5 V to disable until MCU asserts enable signal.

Use Value: L-band V_GS(th) ensures deterministic turn-off margin across temperature; AEC-Q101 qualification guarantees reliability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BSP129H6906HTSA1	V_GS(th) band H (−1.65 V to −1.45 V); otherwise identical ratings and package	Requires more negative gate drive for full turn-off; better noise margin in high-EMI environments	Select when higher turn-off voltage margin is needed over temperature or EMI robustness is prioritized
BS170	250 V V_BR(DSS), 5 Ω R_DS(on) max, but not AEC-Q101 qualified; TO-92 package	Lacks automotive qualification and dv/dt rating; unsuitable for under-hood use	Only for non-automotive prototyping where qualification and ruggedness are not required

Compared with BSP129H6906HTSA1, the L-band version offers lower |V_GS(th)| for easier gate drive in low-voltage systems; compared with BS170, it delivers automotive-grade reliability, SOT223 thermal performance, and verified dv/dt immunity-critical for production automotive designs.

Availability

BSP129L6906HTSA1 is available at Aetrix Electronics and suitable for automotive body control modules, industrial solenoid drivers, and fail-safe power sequencers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BSP129L6906HTSA1 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 microcontrollers, and high-reliability discrete devices.

The BSP129 belongs to Infineon's SIPMOS® small-signal transistor family, designed specifically for automotive and industrial applications demanding depletion-mode behavior, high dv/dt immunity, and AEC-Q101 qualification.

FAQ

What does the 'L6906' suffix indicate in BSP129L6906HTSA1?

The 'L6906' denotes V_GS(th) band L (−1.5 V to −1.35 V) and reel packaging code 6906, confirming tight threshold voltage grouping per reel. This band is laser-marked on the device and printed on the reel label. Band L enables predictable turn-off behavior without requiring individual device characterization, supporting automated assembly and functional safety compliance in automotive systems.

Can BSP129L6906HTSA1 be used as a high-side switch?

Yes-it functions as a high-side switch when the drain connects to the positive rail and the source supplies the load. Its depletion-mode nature means it conducts with V_GS = 0 V, and turn-off is achieved by pulling the gate negative relative to the source. Layout must ensure gate drive referenced to source potential, and thermal design must account for R_thJS = 25 K/W via the exposed drain pad (Pin 4) to PCB copper.

Is this device suitable for linear (analog) operation?

Yes-its transfer characteristics (I_D vs. V_GS) and R_DS(on) variation over temperature (±20 % from −60 °C to 150 °C) support analog current regulation. However, power dissipation must remain within P_tot = 1.8 W at 25 °C ambient, and thermal derating must follow the provided P_tot(T_A) curve. Linear use requires careful attention to SOA limits, especially at elevated V_DS.

How does the dv/dt rating of 6 kV/µs impact layout?

This rating specifies immunity to false turn-on during rapid voltage transients. To maintain it, minimize gate loop inductance by placing gate resistor close to the gate pin, using short direct traces, and avoiding shared return paths between gate drive and power switching nodes. PCB layout must also isolate gate traces from high-dv/dt drain routing, and ensure adequate clearance to prevent capacitive coupling that could exceed the −1.35 V V_GS(th) threshold.

BSP129L6906HTSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: SIPMOS®

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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

BSP129L6906HTSA1 FAQ

1.How can I place an order for BSP129L6906HTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSP129L6906HTSA1 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 BSP129L6906HTSA1 reliable?

The price and inventory of BSP129L6906HTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSP129L6906HTSA1 is usually 5 days.

3.What payment methods are accepted for BSP129L6906HTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSP129L6906HTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSP129L6906HTSA1?

BSP129L6906HTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSP129L6906HTSA1 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 BSP129L6906HTSA1?

For technical support, including BSP129L6906HTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSP129L6906HTSA1 requirements.

6.How does Aetrix verify that BSP129L6906HTSA1 is sourced from the original manufacturer or authorized distributors?

All BSP129L6906HTSA1 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 BSP129L6906HTSA1 meets industry standards.

7.What is the process for return or replacement of BSP129L6906HTSA1?

All BSP129L6906HTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BSP129L6906HTSA1, 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 BSP129L6906HTSA1 part is unused and in its original packaging.

Return procedure for BSP129L6906HTSA1:

1.Submit a request within 90 days.

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

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