BTS3125TFATMA1 - 2A N-Channel Smart Power Switch | Infineon
MPN: BTS3125TFATMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.12 | $1.12 |
| 10 | $0.96 | $9.60 |
| 100 | $0.78 | $78.00 |
| 500 | $0.65 | $325.00 |
| 1,000 | $0.54 | $540.00 |
BTS3125TFATMA1 Overview
HITFET+ (High Integration Temperature protected FET) is Infineon's category of smart low-side switches; the BTS3125TF family combines a logic-level MOSFET gate driver with comprehensive diagnostic feedback so designers can drive resistive, capacitive or inductive loads without the discrete components traditionally required for protection and status feedback. The BTS3125TFATMA1 specifically operates from a 5 V logic supply rail with input compatibility for 3.3 V and 5 V microcontroller GPIO, replacing electromechanical relays and discrete MOSFET+resistor+diode solutions with a single protected IC.
Key specifications include 2 A continuous drain current, 250 mΩ typical RDS(on), logic-level input, 40 V load-dump transient protection, and a status flag output that signals fault conditions (over-temperature, short-circuit, open load). The integrated thermal shutdown typically engages around 150°C, and the device provides automatic restart after a fault clears. The PG-TO252-3-313 package offers a thermal resistance of approximately 80 °C/W which, combined with the tab, supports continuous 2 A operation without a dedicated external heatsink when properly PCB-mounted.
Typical applications include driving 12 V automotive lamps, solenoids, valves, relays, LED arrays, and small motors in body-control modules and industrial actuators. The wide operating range (typically 5 V to 28 V continuous, with 40 V transient) suits both 12 V automotive and 24 V industrial bus architectures. Built-in protection allows direct connection to wiring harnesses without additional protection circuits on the board.
When designing with this part, place the exposed tab on a copper pour sized to limit junction temperature rise; at 2 A load and 13.5 V supply, power dissipation reaches roughly 0.96 W, and a 1 cm² copper area is typically adequate for continuous operation in still air. Ensure the input pin has a clean logic-level signal and is not left floating during power-up.
Drop-in alternatives for BTS3125TFATMA1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with BTS3125TFATMA1 (same form factor and footprint) — differing in Package, Product Type, Operating Temperature Range, Number of Channels, Automotive Grade.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BTS3050TFATMA1
✅ Drop-In✓ In Stock
$1.02 / Unit
View Datasheet →BTS3035TFATMA1
✅ Drop-In✓ In Stock
$0.61 / Unit
View Datasheet →BTS3125TFATMA1 Maximum Ratings & Electrical Characteristics
| Product Type | Single-channel N-channel low-side smart power switch |
| Load Current (continuous) | 2 A |
| RDS(on) typical | 250 mΩ at 5 V Vbb |
| Supply Voltage (Vbb, nominal) | 5 V |
| Supply Voltage (Vbb, operating) | 5 V to 28 V |
| Load Dump Transient Protection | 40 V |
| Input Logic Compatibility | 3.3 V / 5 V CMOS |
| Operating Temperature Range | -40°C to +150°C |
| Over-temperature Shutdown | ~150°C with auto-restart |
| Short-Circuit Protection | Yes, current-limited |
| Over-voltage Protection | Yes (clamping at 40 V) |
| Status Flag Output | Yes (fault feedback) |
| Package | PG-TO252-3-313 (DPAK, SC-63) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
BTS3125TFATMA1 Pin Configuration
| Pin 1 | IN — Logic input (3.3V/5V CMOS compatible) |
| Pin 2 | GND — Ground (also drain return path) |
| Pin 3 | Vbb — Supply voltage (5V to 28V nominal, 40V transient) |
| Pin TAB | Drain — MOSFET drain output to load (connected to TAB) |
Typical Applications
BTS3125TFATMA1 is suitable for 6 applications: Automotive 12V Lamp Driver, Solenoid and Valve Driver, Relay Replacement, LED Array Driver, Small DC Motor Drive, Industrial 24V Actuator Switching.
Automotive 12V Lamp Driver
The BTS3125TFATMA1 fits automotive 12V lamp driving because its 2A continuous drain handles bulb inrush (typical 8-10x steady current), its 250mΩ RDS(on) keeps steady-state conduction losses manageable, and integrated 40V load-dump protection withstands automotive transient events per ISO 7637-2. Placed between the chassis ground and the lamp return, with the status flag wired back to the BCM microcontroller for lamp-out diagnostics, the device replaces electromechanical relays and discrete MOSFET circuits with a single protected IC. Unlike a discrete MOSFET, the BTS3125TFATMA1's built-in short-circuit and over-temperature protection prevents fire risk during wiring harness faults - critical for ASIL-rated body electronics.
Recommended
Solenoid and Valve Driver
The BTS3125TFATMA1 drives 12V/24V hydraulic and pneumatic valves in industrial automation because its 2A continuous current matches typical solenoid coil ratings and its integrated inductive-load flyback handling protects the device when the coil de-energizes. Connected between the valve coil and ground with a flyback path internal to the IC, the BTS3125TFATMA1 provides diagnostic feedback on coil short and open-load conditions. Compared to discrete MOSFET + diode solutions, the integrated short-circuit protection prevents catastrophic PCB damage during valve coil shorts - essential for 24V industrial bus architectures where the device operates up to 28V continuous and 40V transient.
Recommended
Relay Replacement
The BTS3125TFATMA1 replaces 12V electromechanical automotive relays because it eliminates the coil current draw, mechanical bounce, and contact wear that limit relay lifetime. With 2A switching capability in the same through-hole DPAK-equivalent package, the BTS3125TFATMA1 mounts on the same PCB footprint as standard automotive relays and provides faster switching (< 100µs), silent operation, and built-in fault diagnostics via the status flag. Compared to a discrete N-channel MOSFET, the integrated short-circuit and over-temperature protection of the BTS3125TFATMA1 prevents the welding failure modes common to automotive relay sockets.
Recommended
LED Array Driver
The BTS3125TFATMA1 drives low-side automotive LED strings because its 2A continuous current supports multi-LED arrays and its PWM capability through the logic input enables brightness control directly from a microcontroller GPIO. Placed between the LED cathode and ground, with the MCU driving the input pin at 200-1000 Hz PWM, the BTS3125TFATMA1 replaces discrete MOSFET+gate driver combinations. Unlike a discrete MOSFET, the built-in open-load detection flag alerts the BCM to LED failure - a key feature for automotive exterior lighting where photometric compliance depends on knowing each LED is functional.
Recommended
Small DC Motor Drive
The BTS3125TFATMA1 drives small brushed DC motors (fans, pumps, actuators) in body-control modules because its 2A rating handles inrush current and its low 250mΩ RDS(on) minimizes voltage drop across the switch. With PWM control from the MCU and integrated thermal shutdown, the device supports continuous-duty motor operation without external heatsinking when PCB-mounted on adequate copper. Compared to a discrete MOSFET + flyback diode, the BTS3125TFATMA1's built-in protection prevents catastrophic failure during stalled-rotor events - critical for safety-relevant applications like electric mirror or seat-position actuators.
Recommended
Industrial 24V Actuator Switching
The BTS3125TFATMA1 fits 24V industrial actuator switching because it operates continuously up to 28V supply with 40V transient protection, making it compatible with 24V industrial bus architectures. The 2A continuous current supports most pneumatic actuators, indicator lamps and small solenoid valves, and the integrated status flag simplifies PLC fault diagnostics. Placed as a low-side switch on PLC digital output modules, the BTS3125TFATMA1 eliminates the discrete protection components required by a bare MOSFET solution. Compared to a discrete N-channel MOSFET, the built-in short-circuit and over-temperature protection of the BTS3125TFATMA1 prevents field failures in distributed I/O modules.
Recommended
Recommended Products Summary
Engineering reference data for BTS3125TFATMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTS3050TFATMA1 | BTS3035TFATMA1 |
|---|---|---|---|
| Brand | Infineon | Infineon (same brand) | Infineon (same brand) |
| Package | PG-TO252-3-313 (DPAK) | PG-TO252-3-313 (DPAK) - same | PG-TO252-3-313 (DPAK) - same |
| Continuous Drain Current | 2 A | ~2.4 A (+20%) | ~500 mA (-75%) |
| Supply Voltage | 5 V to 28 V (40 V transient) | 5 V to 28 V (40 V transient) - same | 5 V to 28 V (40 V transient) - same |
| Logic Input Level | 3.3 V / 5 V CMOS | 3.3 V / 5 V CMOS - same | 3.3 V / 5 V CMOS - same |
| Status Flag Output | Yes | Yes | Yes |
| Protection Features | OCP / OTP / SCP / OVP / ESD | OCP / OTP / SCP / OVP / ESD - same | OCP / OTP / SCP / OVP / ESD - same |
Key Differentiators
- Higher continuous current capability within same HITFET+ family (vs BTS3035TFATMA1)
- Integrated HITFET+ protection suite with status flag feedback (vs Discrete N-channel MOSFET + gate resistor)
- Slightly higher current capability than discrete equivalent at lower BOM count (vs BTS3050TFATMA1)
Design Notes
Estimated: at 2 A continuous drain and 13.5 V supply driving a 12 V load, the BTS3125TFATMA1 dissipates roughly P = I² × RDS(on) = 2² × 0.25 = 1 W. Mounting the tab on at least 1 cm² of 2 oz copper keeps junction temperature rise under ~80°C above ambient. For continuous 2 A operation in 85°C ambient, size copper pour accordingly. The PG-TO252 package tab doubles as the drain electrical connection AND thermal path - never isolate it electrically if you want thermal dissipation.
Place a 100 nF decoupling capacitor directly at the Vbb pin (PG-TO252 pin 3) to suppress supply transients from load-dump events and PWM edges. Keep the input pin trace short and away from the drain tab to minimize capacitive coupling that could cause false triggering. Route the tab/drain trace with adequate copper width (0.5 mm per 1 A minimum) to handle the 2 A continuous current without excessive voltage drop.
Do not leave the IN pin floating - this can cause undefined on/off behavior during power-up or transient events. Tie IN to GND through a 10 kΩ pull-down if driven by an open-drain source. Do not exceed the 40 V load-dump transient rating; in 24 V industrial systems with high inductive loads, add a TVS clamp to limit inductive kickback. Finally, do not rely on the internal thermal shutdown as a primary protection - design for continuous operation below the thermal limit.
Compliance Information
BTS3125TFATMA1 is automotive-grade and AEC-Q100 qualified per Infineon HITFET+ datasheet. RoHS compliant, lead-free reflow-compatible, halogen-free. The TRA1 suffix denotes tape-and-reel packaging for high-volume assembly.
