Infineon Technologies BTS121AE3045ANTMA1

Overview

BTS121AE3045ANTMA1 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 0.085 Ω typical R_DS(on) at V_GS = 4.5 V. It is used in automotive load protection circuits where overtemperature shutdown and short-circuit robustness are required.

For engineers reviewing the BTS121AE3045ANTMA1 datasheet, BTS121AE3045ANTMA1 pinout, BTS121AE3045ANTMA1 application, or BTS121AE3045ANTMA1 equivalent, key selection criteria include its integrated thermal shutdown function (T_TS(on) = 150 °C), short-circuit withstand capability (I_SC = 68 A, P_SCmax = 1000 W at V_DS ≤ 15 V), and TO-220AB package with drain-connected tab for direct heatsinking.

Technical Context

This device integrates a power MOSFET and a temperature-triggered thyristor on a single die. The thyristor activates when junction temperature reaches ~150 °C, latching the device off until gate reset or power cycle - enabling autonomous overtemperature protection without external circuitry.

It operates as a high-side or low-side switch in DC loads up to 100 V, with fast switching (t_on ≤ 210 ns, t_off ≤ 400 ns) and robust safe operating area (SOA) up to D = 0.01 at T_C = 25 °C. Its R_DS(on) exhibits positive temperature coefficient, supporting current sharing in parallel configurations.

Key Specifications

Pinout & Package

Package: TO-220AB with electrically connected drain tab (Pin 1 = Gate, Pin 2 = Drain/Tab, Pin 3 = Source). The drain is internally shorted to the metal tab, enabling low-inductance, low-thermal-resistance mounting directly to heatsinks.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-reliability thermal-protected MOSFET applications.

Compared with BTS122E3045ANTMA1, the BTS121AE3045ANTMA1 offers tighter V_DS margin and lower gate drive energy, making it optimal for cost-sensitive 24 V automotive loads; unlike IPD95R1K2P7ATMA1, it delivers autonomous thermal protection unattainable with discrete SiC switches.

Availability

BTS121AE3045ANTMA1 is available at Aetrix Electronics and suitable for automotive body control modules, industrial motor starters, and smart fuse replacements requiring stable component supply, long-term lifecycle support, and AEC-Q101 qualified parts.

Supply support for BTS121AE3045ANTMA1 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 leadership in high-reliability protected power switches.

The TEMPFET® product line delivers monolithically integrated power MOSFETs with self-protecting thermal sensing, designed specifically for automotive and industrial applications demanding autonomous fault containment without external supervision.

FAQ

Does BTS121AE3045ANTMA1 require an external gate resistor for safe operation?

No external gate resistor is mandatory for basic switching, but a 10–47 Ω series resistor is recommended to damp ringing and limit peak gate current during fast transitions. The device's gate threshold (1.5–2.5 V) and low input capacitance (C_iss = 1200–1500 pF) allow direct MCU GPIO drive, though layout-dependent parasitics may necessitate controlled slew rate.

Can the temperature latch be reset without power cycling?

No - the thyristor-based latch is non-resettable via gate signal alone. Once triggered, the device remains latched off until V_DD is removed and reapplied, or the gate is actively pulled below –0.3 V for >100 ns (per datasheet "sensor override" condition). This ensures fail-safe behavior during thermal faults.

Is the drain tab electrically isolated from the PCB mounting surface?

No - the drain is internally shorted to the metal tab, so mechanical mounting to a heatsink requires electrical isolation (e.g., mica washer + thermal grease or isolating pad) unless the heatsink is referenced to the drain potential. Failure to isolate may cause short circuits or ground loops in high-side configurations.

What is the maximum allowable case temperature during continuous operation?

The absolute maximum case temperature is 150 °C per the storage and operating range specification. However, continuous operation above 125 °C significantly reduces lifetime and increases risk of premature thermal latch activation. Derating curves show I_D drops to ~12 A at T_C = 100 °C, and thermal design must ensure T_j stays below 150 °C under worst-case ambient and power dissipation.