BTS452RATMA1 - 1.8A Smart High-Side Switch | Infineon
MPN: BTS452RATMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.5 | $1.50 |
| 10 | $1.35 | $13.50 |
| 100 | $1.18 | $118.00 |
| 500 | $1.05 | $525.00 |
| 1,000 | $0.92 | $920.00 |
| 2,500 | $0.85 | $2,125.00 |
BTS452RATMA1 Overview
A high-side switch is a power distribution semiconductor that sits between the supply rail (typically +12 V or +24 V) and the load. It replaces mechanical relays and discrete MOSFETs by integrating the power FET, gate driver, and protection logic into a single chip. High-side switches are used wherever a microcontroller must safely switch a grounded load (lamps, motors, solenoids, heaters) and need diagnostic feedback, current limiting, and protection against fault conditions such as short circuits, overload, and thermal runaway.
Key specifications include an operating voltage range of 6 V to 32 V (load-dump tolerant up to 42 V), embedded overload protection with active current limitation, short-circuit protection, thermal shutdown with auto-restart, overvoltage protection including load dump, and undervoltage shutdown. The integrated charge pump drives the N-channel MOSFET gate, while a status feedback pin reports fault conditions back to the supervising microcontroller, enabling ISO 26262-relevant diagnostic coverage in safety applications.
The BTS452RATMA1 uses a vertical DMOS power stage combined with CMOS control logic on a single die, achieving low specific on-resistance while maintaining robust short-circuit ruggedness. The 8 mΩ nominal RDS(on) (per Infineon's PROFET 24V datasheet family) is achieved through the vertical FET structure that places the drain on the backside of the die, allowing direct thermal conduction into the DPAK tab.
Typical applications include automotive lighting control (headlamps, tail lamps, indicators), relay and solenoid drivers, HVAC blower control, seat-heater switches, and 24 V industrial automation loads. The integrated diagnostics and protection features make it well suited for direct microcontroller-driven load switching without additional discrete protection circuitry.
Designers should pay attention to thermal management: the DPAK-5 tab must be soldered to a sufficient copper pour area (typically 35 cm² or more on a standard 1 oz FR-4 PCB) to keep junction temperature within ratings under worst-case load conditions. The input pin requires a resistor for reverse-battery protection, and the status pin needs a pull-up to logic supply voltage.
This page synthesizes distributor pricing from DigiKey, Mouser, and LCSC, drop-in same-package alternatives from the Infineon PROFET family, and practical PCB thermal design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for BTS452RATMA1 — 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 BTS452RATMA1 (same form factor and footprint) — differing in Package, Diagnostic Output, Topology, Product Type, Automotive Qualification.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BTS452RATMA1
✅ Drop-In✓ In Stock
$0.85 / Unit
View Datasheet →BTS452RXT
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ITS41K0SMENHUMA1
✅ Drop-In✓ In Stock
$0.59 / Unit
View Datasheet →BTS452RATMA1 Maximum Ratings & Electrical Characteristics
| Manufacturer | Infineon Technologies |
| Product Family | Classic PROFET 24V |
| Function | Smart High-Side Power Switch |
| Switch Type | 1:1 N-Channel High-Side |
| Operating Voltage Range | 6 V to 32 V |
| Load Dump Tolerance | 42 V |
| Typical Load Current | 1.8 A |
| Package | PG-TO252-5-11 (DPAK-5) |
| Mounting Type | Surface Mount |
| Number of Pins | 5 (3 logic + tab) |
| Operating Temperature | -40 C to +150 C (junction) |
| Protection Features | Overload, Short Circuit, Thermal Shutdown, Overvoltage, Undervoltage |
| Diagnostic Output | Status pin |
| Automotive Qualified | Yes (AEC-Q100) |
| RoHS Status | Compliant |
BTS452RATMA1 Pin Configuration
| Pin 1 | OUT — Load output (high-side switch drain) |
| Pin 2 | GND — Logic and power ground reference |
| Pin 3 | IN — Logic input (active-high enable from MCU) |
| Pin 4 | STATUS — Open-drain diagnostic fault output |
| Pin 5 | VBB — Battery/supply voltage (also tab) |
| Pin TAB | VBB — Supply voltage; primary thermal path to PCB copper |
Typical Applications
BTS452RATMA1 is suitable for 6 applications: Automotive Lighting Control, Relay and Solenoid Driver, HVAC Blower and Fan Control, Seat Heater and Body Comfort Loads, Industrial 24 V PLC Output Module, Agricultural and Heavy Equipment Lighting.
Automotive Lighting Control
The BTS452RATMA1 is ideal for driving automotive headlamps, tail lamps, turn indicators, and interior lighting at 12 V nominal supply. Its 1.8 A continuous load current and PG-TO252-5-11 thermal performance support halogen bulb and LED-driver loads up to approximately 21 W. Embedded overload, short-circuit, and load-dump (42 V) protection enable direct connection to the automotive battery rail without external TVS diodes. According to Infineon's PROFET family datasheet, the integrated status pin provides diagnostic feedback to the body-control microcontroller, supporting ISO 26262-relevant fault detection for exterior lighting.
Recommended
Relay and Solenoid Driver
The BTS452RATMA1 replaces mechanical automotive relays for switching small solenoids, valves, and latching relays in body-control modules. Its high-side N-channel configuration drives ground-referenced loads directly, simplifying PCB layout compared to low-side discrete MOSFET designs. The 1.8 A rating covers most 12 V body-electronics solenoids (door locks, HVAC flaps, trunk release), while integrated inductive-load handling through the active flyback clamp protects the IC during switch-off. Designers benefit from reduced PCB area and the elimination of flyback diodes versus discrete solutions.
Recommended
HVAC Blower and Fan Control
For HVAC blower motors and small DC fans in 12 V or 24 V body-electronics, the BTS452RATMA1 provides PWM-capable switching with active current limiting to protect against locked-rotor stall conditions. The PROFET family supports low-frequency PWM for variable-speed fan control, while embedded thermal shutdown prevents damage during stalled-rotor faults that can draw 3-5x nominal current. The PG-TO252-5-11 package with proper copper-pour heatsinking (recommended 35 cm² minimum on 1 oz FR-4) keeps junction temperature within the 150 C rating.
Recommended
Seat Heater and Body Comfort Loads
The BTS452RATMA1 is widely deployed in seat-heater control modules, mirror heaters, and steering-wheel warmers where 12 V resistive loads up to approximately 20 W are switched via body-control ECU signals. According to the PROFET 24V family datasheet, the integrated current limit prevents fire hazards from shorted heater elements, while the diagnostic status pin reports open-load faults (broken element) back to the supervising microcontroller. The AEC-Q100 qualification and -40 C to +150 C junction rating cover underhood and cabin thermal environments.
Recommended
Industrial 24 V PLC Output Module
In industrial automation, the BTS452RATMA1 serves as a protected high-side output driver for 24 V PLC digital output modules driving solenoid valves, small DC actuators, and indicator lamps. Its wide 6 V-32 V supply range tolerates industrial 24 V bus transients, while integrated short-circuit protection prevents module damage when wiring faults occur. The PG-TO252-5-11 package and 1.8 A continuous current support typical PLC point loads under 1 A per channel, with paralleling capability for higher-current outputs via multiple PROFET devices.
Recommended
Agricultural and Heavy Equipment Lighting
Off-road agricultural vehicles, construction equipment, and 24 V truck electrical systems benefit from the BTS452RATMA1's 32 V continuous supply rating and 42 V load-dump tolerance. The device drives work lights, beacon flashers, and auxiliary lighting loads in harsh environments where mechanical relay reliability is poor. Its AEC-Q100 qualification and wide temperature range make it suitable for underhood mounting in heavy-equipment applications, while the surface-mount PG-TO252-5-11 package reduces assembly cost versus through-hole relay sockets.
Recommended
Recommended Products Summary
Engineering reference data for BTS452RATMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTS452RATMA1 | BTS452RXT | ITS41K0SMENHUMA1 |
|---|---|---|---|---|
| Package | PG-TO252-5-11 (DPAK-5) | PG-TO252-5-11 (DPAK-5) - same | PG-TO252-5-11 (DPAK-5) - same | PG-TO252-5-11 (DPAK-5) - same |
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Load Current (typ.) | 1.8 A | 1.8 A | 1.8 A | 1.0 A |
| Operating Voltage | 6 V to 32 V | 6 V to 32 V | 6 V to 32 V | 5 V to 34 V |
| Load Dump Tolerance | 42 V | 42 V | 42 V | 45 V |
| Status/Diagnostic Pin | Yes | Yes | Yes | Yes |
| Automotive Qualified | AEC-Q100 | AEC-Q100 | AEC-Q100 | Industrial grade |
| Approximate Unit Price (1 pc) | $1.50 | $1.50 (alternate reel) | Similar | $1.10 - $1.30 |
Key Differentiators
- Integrated diagnostics and protection in a single IC (vs Discrete MOSFET + fuse + current-sense resistor)
- AEC-Q100 qualified for automotive body-electronics (vs Industrial-grade high-side switches)
- Vertical N-channel FET architecture for low RDS(on) (vs Lateral FET high-side switches)
Design Notes
Estimated: At 1.8 A continuous load through the BTS452RATMA1 with RDS(on) of approximately 200 mΩ, conduction loss is roughly 0.65 W. With theta_JA of approximately 50 C/W on a 35 cm² copper pour (1 oz FR-4), junction temperature rise is roughly 32 C above ambient. Maintain ambient below 118 C or increase copper area to 60 cm² for sustained operation near the 1.8 A rating. The PG-TO252-5-11 tab MUST be soldered to the PCB copper pour — using only the pins will result in thermal runaway.
Place a 100 nF ceramic decoupling capacitor between VBB and GND as close to the BTS452RATMA1 pins as possible (within 5 mm). Use wide PCB traces (at least 1 mm per 0.5 A) on the VBB and OUT paths to minimize voltage drop. Add a reverse-battery protection resistor (typically 100 Ω to 1 kΩ) in series with VBB, or use a parallel Schottky diode to ground to protect against reverse-polarity jump-start events common in automotive service environments.
Do not operate the BTS452RATMA1 without proper heatsinking on the tab — the device will enter thermal shutdown prematurely under sustained loads. Ensure the STATUS pin has a pull-up resistor (typically 10 kΩ) to the MCU supply voltage (3.3 V or 5 V); floating the pin can cause false fault reports. For PWM dimming applications, keep PWM frequencies below 1 kHz to avoid exceeding the PROFET's slew-rate capability and risking EMC issues from fast switching transients.
Route the high-current OUT trace directly to the load connector without branching to other circuitry, keeping it on the top layer to minimize via inductance. Connect the GND pin to a low-impedance ground plane on an inner layer via multiple thermal vias to the top-layer copper pour. Keep sensitive analog signal traces (sensor inputs, MCU ADC channels) at least 10 mm away from the OUT trace to avoid coupling noise from load-switch transients into measurement circuits.
Compliance Information
AEC-Q100 qualified for automotive applications. RoHS and REACH compliant per Infineon product page. Halogen-free per Infineon PROFET datasheet family.
