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

Infineon Technologies BTS121ANKSA1

Name: BTS121ANKSA1
Brand: Infineon Technologies
SKU: BTS121ANKSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BTS121ANKSA1

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: BTS121ANKSA1.pdf

Description:: MOSFET N-CH 100V 22A TO220-3

Quantity:: RFQ Add To RFQ list

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Inventory:7,589

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Product details

Overview

BTS121ANKSA1 from Infineon Technologies is an N-channel logic-level enhancement-mode TEMPFET® power MOSFET with integrated temperature-sensing thyristor, rated for 100 V V_DS, 22 A continuous drain current at T_C = 25 °C, and 0.1 Ω R_DS(on) at V_GS = 4.5 V - used in motor control and overload-protected DC power switches where self-triggered thermal shutdown is required.

For engineers reviewing the BTS121ANKSA1 datasheet, BTS121ANKSA1 pinout, BTS121ANKSA1 application, or BTS121ANKSA1 equivalent, this device's integrated temperature sensor with 150 °C switching threshold, short-circuit protection response ≤25 ms, and drain-tab shorting are critical selection criteria for thermally robust industrial power stages.

Technical Context

This TEMPFET integrates a vertical N-channel MOSFET and a monolithically embedded thyristor-based temperature sensor on a single die. The sensor triggers latch-up when junction temperature exceeds ~150 °C, forcing the MOSFET into high-impedance state without external circuitry.

It operates in enhancement mode with V_GS(th) of 1.5–2.5 V, supports logic-level gate drive (V_GS = 4.5 V), and features a built-in body diode rated for 19 A continuous source current and 150 ns reverse recovery time - enabling use in freewheeling and bidirectional current paths.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	100 V - maximum blocking voltage before avalanche; suitable for 24 V/48 V industrial bus systems with margin.
I_D (continuous, T_C = 25 °C)	22 A - steady-state load current capability with heatsink; derates to 3.5 A at T_C = 85 °C.
R_DS(on) (V_GS = 4.5 V)	0.085–0.1 Ω - low conduction loss enabling <1 W dissipation at 10 A, reducing thermal design burden.
T_TS(on)	150 °C - precise, repeatable thermal trip point; thyristor latches until power cycle reset.
t_SC(off)	≤25 ms - short-circuit response time at T_j = 25 °C; protects against sustained overcurrent before thermal runaway.
V_SD (I_F = 38 A)	1.35–1.7 V - forward voltage of integrated body diode; enables efficient freewheeling in inductive loads.
Q_rr	0.58 µC - reverse recovery charge; limits switching loss and EMI during diode commutation.

Pinout & Package

TO-220AB package with isolated tab; drain connected electrically to metal tab (Pin 1), source (Pin 2), and gate (Pin 3). Tab mounting requires insulating washer unless system ground is tied to drain potential.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Tab)	Drain	High-current main power terminal; electrically bonded to metal tab for thermal conduction and low-inductance layout.
Pin 2	Source	Reference node for gate drive and current sensing; connects to load return or ground plane.
Pin 3	Gate	Control input requiring ≤10 V drive; sensitive to ESD; must be actively pulled low to ensure turn-off.

Key Features

Feature	Design Value
Integrated temperature sensor with thyristor latch	Self-protecting thermal cutoff at 150 °C without external comparator or power cycling logic.
Logic-level gate drive (V_GS(th) ≤ 2.5 V)	Direct interface with 3.3 V or 5 V microcontrollers; eliminates level-shifting circuitry.
Drain-to-tab shorting	Enables direct heatsink mounting with minimal thermal resistance; simplifies mechanical assembly and cooling.
Body diode with 150 ns t_rr	Supports fast-switching inductive loads (e.g., solenoids, BLDC phase legs) with controlled reverse recovery.
Short-circuit withstand up to 800 W	Survives transient overloads (e.g., stalled motor, cable fault) for ≥25 ms before shutdown.

Applications

Motor Drive Protection

Industrial DC Power Switch

Use Scenario: 24 V DC brushed motor driver in automated valve actuator subject to stall and ambient temperature up to 85 °C.

IC Role / Device Role / Timing Role: Main power switch with autonomous thermal shutdown; replaces discrete MOSFET + external thermal IC.

Use Value: Eliminates need for separate temperature monitoring and gate disable circuitry, reducing BOM count by 3–4 components.

Use Scenario: High-reliability 48 V DC power distribution unit for factory automation I/O modules.

IC Role / Device Role / Timing Role: Load switch with intrinsic overtemperature and short-circuit protection; acts as smart fuse.

Use Value: Prevents fire hazard during wiring faults while maintaining system uptime via automatic reset after cooldown.

Solenoid Control

Power Supply OR-ing

Use Scenario: 12–24 V solenoid bank in packaging machinery with rapid on/off cycling and coil inductance >100 mH.

IC Role / Device Role / Timing Role: High-side switch with integrated freewheeling path and thermal foldback.

Use Value: Body diode handles flyback energy; thyristor prevents thermal runaway during repeated duty-cycle surges.

Use Scenario: Redundant 24 V power supply OR-ing in PLC backplane with hot-swap capability.

IC Role / Device Role / Timing Role: Low-loss, protected power path selector with fail-safe thermal cutoff.

Use Value: R_DS(on) < 0.1 Ω minimizes voltage drop; latch-on thermal shutdown avoids cascading failure across supplies.

Equivalent & Alternatives

The following parts are listed as comparable options for similar thermally protected power switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP12NF10L	100 V, 12 A, no integrated temperature sensor; standard logic-level MOSFET.	Requires external thermal protection circuit (comparator + latch + gate driver).	Choose only if full thermal autonomy is unnecessary and cost sensitivity outweighs protection reliability.
BTS122ANKSA1	Same TEMPFET architecture; higher R_DS(on) (0.15 Ω), lower I_D (16 A), identical thermal trip point.	Lower power handling; suited for space-constrained 12 A designs with same safety requirements.	Select when thermal margin allows higher on-resistance and board area limits TO-220 footprint.

Compared with STP12NF10L, BTS121ANKSA1 delivers autonomous thermal protection without added components; versus BTS122ANKSA1, it provides 37.5% higher current capacity and 33% lower conduction loss at equal V_GS, making it optimal for 20–22 A industrial loads.

Availability

BTS121ANKSA1 is available at Aetrix Electronics and suitable for motor drive protection, industrial DC power switching, solenoid control, and redundant power OR-ing requiring stable component supply and guaranteed long-term lifecycle support.

Supply support for BTS121ANKSA1 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, and industrial control ICs and discrete devices.

The TEMPFET® product line delivers monolithic power switches with embedded thermal protection - designed specifically for industrial actuators, motor drives, and power distribution systems where safety-critical thermal runaways must be prevented autonomously.

FAQ

Does BTS121ANKSA1 require an external gate resistor for safe operation?

Yes - a gate resistor (typically 10–47 Ω) is required to dampen ringing and limit peak gate current during switching. Without it, parasitic inductance can cause oscillation or gate overvoltage, risking premature failure. The datasheet specifies R_GS = 50 Ω for timing measurements, confirming its necessity in real layouts.

Can the temperature sensor be disabled or bypassed?

No - the thyristor-based temperature sensor is monolithically integrated and non-disableable. It activates automatically when junction temperature reaches ~150 °C and latches until power is cycled. There is no pin, register, or external signal to suppress or recalibrate this function.

Is the drain-to-tab connection insulated in the TO-220AB package?

No - Pin 1 (drain) is electrically shorted to the metal tab per datasheet specification. This requires electrical isolation (e.g., mica washer + shoulder washer) if the heatsink is grounded or at a different potential than the drain node.

What happens after thermal latch activation - does the device recover automatically?

No automatic recovery occurs. Once the thyristor latches due to overtemperature, the MOSFET remains in high-impedance state until V_DS is removed (i.e., power cycled). Junction cooling alone does not reset the latch; full power interruption is mandatory to restore functionality.

BTS121ANKSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: TEMPFET®

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 100 V

Current - Continuous Drain (Id) @ 25°C:: 22A (Tc)

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

Rds On (Max) @ Id, Vgs:: 100mOhm @ 9.5A, 4.5V

Vgs(th) (Max) @ Id:: 2.5V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: -

Vgs (Max):: ±10V

Input Capacitance (Ciss) (Max) @ Vds:: 1500 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 95W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: PG-TO220-3

BTS121ANKSA1 FAQ

1.How can I place an order for BTS121ANKSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BTS121ANKSA1 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 BTS121ANKSA1 reliable?

The price and inventory of BTS121ANKSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BTS121ANKSA1 is usually 5 days.

3.What payment methods are accepted for BTS121ANKSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BTS121ANKSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BTS121ANKSA1?

BTS121ANKSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BTS121ANKSA1 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 BTS121ANKSA1?

For technical support, including BTS121ANKSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BTS121ANKSA1 requirements.

6.How does Aetrix verify that BTS121ANKSA1 is sourced from the original manufacturer or authorized distributors?

All BTS121ANKSA1 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 BTS121ANKSA1 meets industry standards.

7.What is the process for return or replacement of BTS121ANKSA1?

All BTS121ANKSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BTS121ANKSA1, 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 BTS121ANKSA1 part is unused and in its original packaging.

Return procedure for BTS121ANKSA1:

1.Submit a request within 90 days.

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

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