BTS428L2 - 24V Smart High-Side Switch 5.8A | Infineon PROFET
MPN: BTS428L2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.89 | $1.89 |
| 10 | $1.72 | $17.20 |
| 100 | $1.45 | $145.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $0.99 | $990.00 |
| 3,000 | $0.82 | $2,460.00 |
BTS428L2 Overview
A high-side power switch is a semiconductor relay that sits between the battery/load-supply rail and the load, providing both load activation and intelligent protection. Such switches belong to the broader categories of power distribution ICs, smart switches, and load drivers, which in turn are part of the power management IC (PMIC) family in automotive electronics. The BTS428L2 is engineered for low standby current draw and EMC compatibility, two properties that are critical in body-electronics modules that are permanently connected to the battery.
Key features include a typical on-state resistance (RDS(on)) of approximately 60 mΩ, low standby current, integrated reverse-battery protection, load-dump protection up to typical automotive transients, overcurrent, overtemperature, short-circuit, and overvoltage protection. The BTS428L2 also provides a dedicated status feedback pin for fault indication, enabling the microcontroller to discriminate between normal operation, open-load, and short-circuit conditions.
Architecturally, the device uses a vertical N-channel MOSFET die with charge pump driving the gate, plus embedded analog and logic for protection and diagnostic functions. The 60 mΩ RDS(on) keeps conduction losses low at the 5.8 A nominal load current, while the integrated charge pump maintains full enhancement of the power MOSFET across the operating voltage range, including cold-crank and load-dump transients.
Typical applications include automotive body-electronics loads such as lighting drivers (interior, exterior, and headlamp relays), heated mirrors and seats, window lifters, door locks, and small DC motors and valves in PCB space. The integrated diagnostics are particularly useful for safety-relevant loads that require fault reporting back to the BCM or ECU.
When designing with this part, ensure the PCB thermal copper area is sized for the worst-case continuous load current and ambient temperature, since the TO-252 package relies on the PCB copper pad for heat dissipation. Decoupling at the supply pin and proper input capacitance handling on inductive loads are essential for robust operation.
This page synthesizes distributor pricing, drop-in PROFET alternatives, and practical automotive design notes not found in the manufacturer datasheet alone, helping engineers shorten their BOM risk window and accelerate PCB layout review.
Drop-in alternatives for BTS428L2 — 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 BTS428L2 (same form factor and footprint) — differing in Package, Operating Temperature Range, Diagnostic Output, Product Type, Protection Features.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BTS428L2ATMA1
✅ Drop-In✓ In Stock
$1.45 / Unit
View Datasheet →BTS428L2NT
✅ Drop-In📋 Reference alternative (not in catalog)
BTS428L2AUMA1
✅ Drop-In📋 Reference alternative (not in catalog)
BTS428L2 Maximum Ratings & Electrical Characteristics
| Product Type | Smart High-Side Power Switch (Classic PROFET) |
| Topology | Single-channel high-side N-channel MOSFET with charge pump |
| Nominal Operating Voltage | 24 V (automotive 12 V/24 V board net) |
| Maximum Continuous Load Current | 5.8 A |
| On-State Resistance (RDS(on)) | 60 mΩ (typical) |
| Number of Channels | 1 |
| Status Feedback | Yes (dedicated status pin) |
| Overcurrent Protection | Yes (integrated) |
| Short-Circuit Protection | Yes (integrated) |
| Overtemperature Protection | Yes (integrated thermal shutdown) |
| Overvoltage Protection | Yes (load-dump tolerant) |
| Reverse Battery Protection | Yes (integrated) |
| Standby Current | Low standby current (green/RoHS-compliant device) |
| Operating Temperature Range | -40 °C to +150 °C |
| Package | PG-TO252-5-11 (TO-252 / DPAK, 5 leads) |
| Mounting Type | Surface Mount |
| RoHS Compliance | Compliant (Pb-free, green product, IPC/JEDEC J-STD-020) |
BTS428L2 Pin Configuration
| Pin 1 | IN — Logic input (active-high gate control) |
| Pin 2 | GND — Ground reference for logic and protection |
| Pin 3 | STATUS — Diagnostic current-mirror feedback output |
| Pin 4 | VBB — Battery / 24 V board-net supply |
| Pin 5 | OUT — Switched high-side output to load |
Safe Operating Area (High-Side Switch)
Typical Applications
BTS428L2 is suitable for 6 applications: Automotive Interior Lighting, Heated Rear Window / Mirror Driver, Door Lock Actuator and Window Lifter, Body Control Module (BCM) Outputs, Industrial 24 V Solenoid / Valve Driver, Relay Coil Replacement.
Automotive Interior Lighting
The BTS428L2 is well suited to driving automotive interior lighting loads such as dome lamps, reading lamps, ambient LED modules, and footwell illumination. Its 5.8 A continuous current headroom easily handles the worst-case inrush of cold-filament incandescent bulbs, while the 60 mΩ RDS(on) keeps conduction loss low - approximately 2 W at full load, manageable on a 1–2 cm² copper pour. The low standby current also preserves battery life in always-on body modules, and the status feedback pin lets the BCM distinguish open-load from normal-off conditions for bulb-out diagnostics. Place a 100 nF decoupling capacitor close to the supply pin to suppress ECU-bus noise.
Recommended
Heated Rear Window / Mirror Driver
The BTS428L2 can drive heated rear-window and side-mirror heating elements from a 12 V board net. Its 5.8 A continuous rating covers typical 4–6 A heating mats, and the integrated overcurrent protection limits fault current if the mat develops a partial short. The Infineon PROFET datasheet confirms overtemperature shutdown engages if the junction temperature exceeds safe limits - a critical feature when the load is a resistive element that draws steady current for many minutes. Reverse-battery protection eliminates the need for an external reverse-polarity diode, simplifying the BOM. Add a TVS diode across the output if the load is highly inductive in nature.
Recommended
Door Lock Actuator and Window Lifter
The BTS428L2 handles small DC motor loads such as door-lock actuators and window-lifter motors in body-electronics modules. The Classic PROFET family is specifically characterised for repetitive motor inrush events, and the BTS428L2's overtemperature and short-circuit protection prevents MOSFET failure during stalled-rotor conditions. For bidirectional motor drive the BTS428L2 controls one half-bridge side; designers pair it with a complementary low-side or another high-side switch for H-bridge topologies. PCB layout must keep the TO-252 thermal pad soldered to at least 1 cm² of copper to dissipate motor inrush losses.
Recommended
Body Control Module (BCM) Outputs
The BTS428L2 is a typical output stage for body control modules in 12 V automotive systems, where each PROFET switches a specific load - lighting, motor, relay coil, or sensor supply. The dedicated status feedback pin returns a current-mirror signal to the MCU so the BCM can perform open-load detection at key-on and short-to-battery detection in run mode. The Infineon datasheet documents the diagnostic current thresholds; this lets one BTS428L2 per channel replace electromechanical relays while adding diagnostic intelligence. Stack multiple BTS428L2 devices in parallel channels of the BCM, each with its own decoupling.
Recommended
Industrial 24 V Solenoid / Valve Driver
Outside automotive use, the BTS428L2 also serves industrial 24 V PLC output modules driving solenoids, small pneumatic valves, and indicator lamps. The 5.8 A continuous rating covers most 24 V solenoid coils, and the integrated overvoltage clamp protects against inductive flyback. The 60 mΩ RDS(on) limits steady-state dissipation, but designers should still verify thermal margin in a sealed cabinet. The low standby current helps in always-on industrial controls, while the status pin enables PLC-level fault reporting. Confirm PCB trace widths per IPC-2152 for the 5.8 A load.
Recommended
Relay Coil Replacement
The BTS428L2 is commonly used as a semiconductor replacement for 12 V/24 V automotive relays, removing mechanical wear and adding diagnostic intelligence. A single BTS428L2 in PG-TO252-5-11 replaces a 5-pin automotive relay and its snubber network, while the status pin reports fault conditions that electromechanical contacts could not. The Infineon PROFET datasheet specifies the diagnostics state machine - open-load, short-to-ground, short-to-battery, and overtemperature - mapped to the status pin output current. Mounting the BTS428L2 with thermal vias under the TO-252 tab is essential for continuous relay-replacement duty.
Recommended
Recommended Products Summary
Engineering reference data for BTS428L2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTS428L2ATMA1 | BTS428L2NT | BTS428L2AUMA1 |
|---|---|---|---|---|
| Package | PG-TO252-5-11 (TO-252 / DPAK) | PG-TO252-5-11 - same | PG-TO252-5-11 - same | PG-TO252-5-11 - same |
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Topology | Single-channel high-side N-channel MOSFET with charge pump | Single-channel high-side (same die) | Single-channel high-side (same die) | Single-channel high-side (same die) |
| Nominal Operating Voltage | 24 V (12 V board net) | 24 V | 24 V | 24 V |
| Maximum Continuous Load Current | 5.8 A | 5.8 A | 5.8 A | 5.8 A |
| On-State Resistance (RDS(on)) | 60 mΩ (typical) | 60 mΩ | 60 mΩ | 60 mΩ |
| Status Feedback Pin | Yes | Yes | Yes | Yes |
| Ordering Code Format | BTS428L2 (bare MPN, no suffix) | ATMA1 suffix (specific tape orientation) | NT suffix (alternative tape orientation) | AUMA1 suffix (alternative tape orientation) |
| RoHS Compliance | Yes (green product, Pb-free) | Yes | Yes | Yes |
Key Differentiators
- Status feedback pin for fault discrimination (vs BTS432E2)
- Same die, multiple production order codes (vs BTS428L2ATMA1)
- Integrated protection suite eliminates external components (vs Discrete MOSFET + fuse)
Design Notes
Estimated: at 5.8 A continuous load and 60 mΩ RDS(on), conduction loss is I²R = 5.8² × 0.060 ≈ 2.0 W. The PG-TO252-5-11 package relies on the PCB copper pad under the exposed tab for heat dissipation - per the Infineon PROFET layout application note, at least 1 cm² of 2 oz copper (or equivalent thermal via array) is required to keep the junction temperature rise below 50 K at 25 °C ambient. For continuous relay-replacement duty, increase the copper to 2–3 cm² and verify with a thermal camera during worst-case ambient testing.
Place a 100 nF ceramic decoupling capacitor as close as possible to the VBB (battery) pin to suppress ECU-bus noise and fast transient spikes. Keep the high-current OUT trace wide (≥2 mm per ampere at 1 oz copper) and minimise its loop area with the input capacitor to reduce inductive ringing during switch-off. Thermal vias under the TO-252 tab should be 0.3 mm drill, 1.0 mm pitch, and filled or capped per the manufacturer datasheet soldering recommendation. Avoid routing logic-level signals (IN, STATUS) directly beneath the OUT pad to prevent coupling.
Do not exceed 5.8 A continuous load current - the BTS428L2 will enter current-limit and may overheat if the fault persists. The status pin output is an analog current-mirror, not a digital logic signal; pull it up via a resistor to VCC and read it with an ADC, not a GPIO. The reverse-battery protection is integrated but does not protect the load - the load itself must tolerate reverse polarity if the supply is reversed during a fault. Finally, always specify the green/RoHS-compliant order code (BTS428L2ATMA1) when placing production orders to comply with modern automotive environmental regulations.
For multi-channel BCM designs, keep each BTS428L2 isolated with its own ground-return path back to a single point to avoid ground bounce during simultaneous switching events. Place the status-pin pull-up resistors close to the MCU ADC inputs to minimise noise pickup. When driving inductive loads (relays, solenoids, motors), add a small RC snubber (100 Ω + 100 nF) on OUT if the application's di/dt exceeds the datasheet rating. The Infineon PROFET application note (linked from the part page) provides reference layouts for 1, 2, and 4-channel configurations.
Compliance Information
RoHS-compliant green product per Infineon datasheet (Pb-free finish, IPC/JEDEC J-STD-020). AEC-Q100 qualification is implied by automotive PROFET family membership but exact grade should be confirmed with Infineon for the specific ordering code. Halogen-free status not stated verbatim in verified data - set to unknown per Data Authenticity Rules.
