BTS3050TFATMA1 - 4A Smart Low-Side Power Switch HITFET | Infineon
MPN: BTS3050TFATMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.38 | $138.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $1.02 | $1,020.00 |
BTS3050TFATMA1 Overview
A smart low-side power switch (also called an intelligent FET or HITFET) is a discrete-or-IC power switch that combines a MOSFET with on-die protection, status feedback, and a logic-level gate driver. Low-side switches sit between the load and ground, switching the return path, and are widely used in automotive body electronics, industrial control, and any application needing protected switching of resistive, inductive, or lamp loads. Compared to a discrete MOSFET, the integrated switch eliminates gate drive complexity and provides fault diagnostics that would otherwise require external comparators and current-sense resistors.
Key features of the BTS3050TFATMA1 include 44 mOhm RDS(on) at 25 C, 4 A continuous drain current, logic-level CMOS-compatible input, status flag output, and built-in clamping for inductive loads. The integrated protective functions include current limitation, thermal shutdown with auto-restart, over-voltage protection on Vbb, and reverse battery protection on Vbb. The HITFET+ technology from Infineon combines a vertical MOSFET with smart analog protection on the same die, reducing PCB area and BOM count versus discrete solutions.
The BTS3050TFATMA1 uses Infineon's vertical DMOS process optimized for 12 V automotive load switching. Its logic-level input thresholds (CMOS-compatible) allow direct connection to 3.3 V or 5 V microcontrollers without level translation. The status feedback pin reports fault conditions to the host MCU, enabling centralized diagnostics over CAN or LIN in body control modules.
Typical applications include automotive body electronics (door lock motors, seat adjustment, mirror folding), LED lighting modules (interior/exterior lamps, dimming control), relay and solenoid replacement, industrial PLC outputs, and any 12 V or 24 V load switching that benefits from integrated protection and diagnostics.
When designing with the BTS3050TFATMA1, place a reverse-battery protection diode on Vbb or use a series resistor to limit inrush. Decoupling capacitors of at least 100 nF must be placed close to the Vbb pin to absorb load-dump transients. The thermal pad must be soldered to a sufficient copper pour to keep junction temperature below the 150 C shutdown threshold.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical PCB thermal notes not found in the manufacturer datasheet.
Drop-in alternatives for BTS3050TFATMA1 — 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 BTS3050TFATMA1 (same form factor and footprint) — differing in Package, Product Type, Operating Temperature Range, Topology, Input Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BTS3035TFATMA1
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View Datasheet →BTS428L2ATMA1
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View Datasheet →BTT60101ERBXUMA1
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View Datasheet →BTN9960LVAUMA1
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View Datasheet →BTS118DATMA1
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View Datasheet →BSP762TXUMA1
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View Datasheet →BTS3050TFATMA1 Maximum Ratings & Electrical Characteristics
| Part Number | BTS3050TFATMA1 |
| Manufacturer | Infineon Technologies |
| Product Family | HITFET Smart Low-Side Switch |
| Switch Type | N-Channel Low-Side Smart Power Switch |
| Number of Outputs | 1 |
| RDS(on) (typ) | 44 mOhm at 25 C |
| Continuous Drain Current | 4 A |
| Load Voltage (max) | 5.5 V |
| Logic Input | CMOS compatible, logic-level |
| Status Output | Yes (fault feedback) |
| Protection Features | Over-current, Over-temperature, Over-voltage, ESD |
| Operating Temperature | -40 C to +150 C (junction) |
| Package | PG-TO252-3-313 (TO-252 / DPAK) |
| Mounting Type | Surface Mount |
| AEC-Q100 | Qualified |
| RoHS | Compliant |
BTS3050TFATMA1 Pin Configuration
| Pin 1 | IN — Logic-level input (CMOS-compatible gate drive) |
| Pin 2 | Vbb — Supply / Drain (also thermal tab) |
| Pin 3 | GND — Ground (source of internal MOSFET) |
Safe Operating Area
Typical Applications
BTS3050TFATMA1 is suitable for 6 applications: Automotive Body Control Modules, Automotive Interior LED Lighting, Relay and Solenoid Replacement, Industrial PLC Digital Outputs, Battery-Connected Sensor Power Switching, Heating Element and Resistive Load Control.
Automotive Body Control Modules
The BTS3050TFATMA1's 4 A continuous current, 44 mOhm RDS(on), and AEC-Q100 Grade 0 qualification make it ideal for body control module (BCM) outputs that drive door lock motors, mirror adjusters, and seat position actuators. Low-side switching is well suited to BCM ground-referenced loads, while the integrated status flag simplifies ISO 14229 UDS diagnostic compliance. The HITFET family's reverse-battery and load-dump protection exceed ISO 7637-2 pulse requirements, reducing external TVS component count and saving PCB area in space-constrained BCM designs where multiple output channels are required.
Recommended
Automotive Interior LED Lighting
Driving interior and exterior LED lamps at 5 V or 12 V rails benefits from the BTS3050TFATMA1's PWM-capable logic input and integrated thermal shutdown. Designers can implement dimming via 1 kHz PWM at the IN pin while the smart switch handles inrush and short-to-ground faults automatically. The 4 A continuous rating supports multi-LED strings up to 60 W at 12 V, and the low 44 mOhm RDS(on) keeps conduction loss below 0.7 W per channel at full load - important for sealed lamp assemblies where ambient temperature can reach 85 C.
Recommended
Relay and Solenoid Replacement
Solid-state relay replacement using the BTS3050TFATMA1 eliminates the audible click, contact bounce, and mechanical wear of electromechanical relays in industrial and automotive applications. The 44 mOhm RDS(on) results in lower voltage drop than a typical 100 mOhm automotive relay coil circuit, while the CMOS-compatible input allows direct microcontroller driving without driver transistors. With 115 us typical turn-on time and comprehensive protection, the BTS3050TFATMA1 outperforms electromechanical relays in switching speed, lifetime (no moving parts), and diagnostic capability for predictive maintenance systems.
Recommended
Industrial PLC Digital Outputs
Industrial PLC digital output modules that switch 24 V field loads benefit from the BTS3050TFATMA1's robust protection set and logic-level input. The integrated over-current and over-temperature protection allow the output module to survive short circuits and overload conditions that would destroy discrete MOSFET solutions, while the status flag enables per-channel fault reporting to the PLC CPU. The PG-TO252-3-313 package is industry-standard for PLC output stages and provides sufficient thermal margin for 4 A continuous operation at 60 C ambient with proper copper layout.
Recommended
Battery-Connected Sensor Power Switching
The BTS3050TFATMA1 can switch battery-connected sensor power rails in ECU-internal architectures where a 5 V or 12 V sub-rail is enabled by the MCU. Its low quiescent current (<10 uA when off) preserves battery life in always-on circuits, and the reverse-battery protection prevents damage if the external harness is miswired during service. For sensor modules such as cabin humidity, particulate matter, or occupant detection sensors, the BTS3050TFATMA1 provides a protected low-side enable that can be PWM'd for sensor heating or LED indicator control without external drivers.
Recommended
Heating Element and Resistive Load Control
PTC heater elements and resistive loads used in HVAC seat heaters, mirror heaters, and steering wheel heaters benefit from the BTS3050TFATMA1's 4 A continuous rating and integrated fault protection. Low-side switching of the load allows the chassis to remain at battery potential while the BTS3050TFATMA1 controls ground-return current, simplifying harness routing. The thermal shutdown and current limit features protect against blocked-vent fault conditions where heater elements can exceed safe operating temperature without external temperature sensors, making the BTS3050TFATMA1 an excellent choice for safety-critical thermal management subsystems.
Recommended
Recommended Products Summary
Engineering reference data for BTS3050TFATMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTS3035TFATMA1 | BTS428L2ATMA1 | BTT60101ERBXUMA1 | BTN9960LVAUMA1 | BTS118DATMA1 | BSP762TXUMA1 |
|---|---|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon |
| Package | PG-TO252-3-313 (DPAK) | PG-TO252-3-313 (DPAK) - same | PG-TO252-3-313 (DPAK) - same | PG-TO252-3-313 (DPAK) - same | PG-TO252-3-313 (DPAK) - same | PG-TO252-3-313 (DPAK) - same | PG-TO252-3-313 (DPAK) - same |
| Switch Topology | Low-side N-channel | Low-side N-channel | High-side N-channel | High-side PROFET+ | Half-bridge NovalithIC | Low-side N-channel | High-side PROFET |
| Vbb Max | 5.5 V | 50 V | 42 V | 36 V | 40 V | 60 V | 60 V |
| Continuous Current | 4 A | 4 A | 5 A | 7 A | 10 A | 3 A | 5 A |
| RDS(on) typ | 44 mOhm | 44 mOhm | 35 mOhm | 18 mOhm | 12 mOhm | 70 mOhm | 60 mOhm |
| AEC-Q100 | Qualified (Grade 0) | Qualified | Qualified | Qualified | Qualified | Qualified | Qualified |
| Status Output | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Low Vbb rating ideal for ECU-internal logic-rail switching (vs BTS3035TFATMA1 (50 V variant))
- Logic-level CMOS-compatible input (vs BTS428L2ATMA1 (high-side))
- AEC-Q100 Grade 0 qualified (-40 C to +150 C Tj) (vs BTT60101ERBXUMA1 (PROFET+))
- Integrated status feedback for diagnostics (vs BTN9960LVAUMA1 (NovalithIC half-bridge))
Design Notes
Estimated: at 4 A continuous and 44 mOhm RDS(on), conduction loss is approximately P = I^2 * R = 16 * 0.044 = 0.70 W per channel. With DPAK theta_JA of approximately 50 C/W on 1 square inch of 2-oz copper, junction rise above ambient is 0.70 * 50 = 35 C. For ambient temperatures above 100 C (under-hood applications), the part enters thermal shutdown prematurely; design with at least 2 square inches of copper pour to keep theta_JA below 35 C/W. Multi-layer boards with internal copper planes further improve thermal performance.
Place the BTS3050TFATMA1 thermal pad over a copper pour that extends at least 5 mm beyond the package on all sides. Use thermal vias (0.3 mm diameter, 1 mm pitch) under the tab to connect top copper to bottom or inner copper layers. Add 100 nF X7R ceramic decoupling capacitor within 3 mm of the Vbb pin to suppress load-dump transients. Route the IN pin trace away from switching nodes to avoid capacitive coupling that could cause false triggering.
Do not exceed the 5.5 V Vbb absolute maximum - this part is designed for sub-rail switching only, not direct 12 V battery connection. For battery-direct switching use the 50 V BTS3035TFATMA1. Always honor the power-on sequence: Vbb must be applied before or simultaneously with IN; if IN is high before Vbb, the part may latch off due to under-voltage detection. The status output requires a pull-up resistor (typically 10 kOhm to 5 V) and should not be left floating in safety-critical designs.
Keep the high-current load trace wide (>= 2 mm per ampere) and short to minimize parasitic inductance that can cause voltage ringing during turn-off of inductive loads. Add a TVS diode (e.g., SMBJ5.0A) close to the load connector to clamp inductive kickback. For PWM dimming applications above 1 kHz, place a 1 nF X7R capacitor on the IN pin to filter out switching noise that could otherwise cause the internal gate driver to misfire.
Compliance Information
AEC-Q100 Grade 0 qualified for automotive. RoHS and REACH compliant per Infineon product declaration. Lead-free (Pb-free) reflow-compatible per JEDEC J-STD-020.
