BSP742RXUMA1 - 400mA Smart High-Side Switch, 5-34V | Infineon
MPN: BSP742RXUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.95 | $1.95 |
| 10 | $1.72 | $17.20 |
| 100 | $1.41 | $141.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $0.96 | $960.00 |
| 2,500 | $0.81 | $2,025.00 |
BSP742RXUMA1 Overview
A high-side power switch is a semiconductor device that connects a load to the positive supply rail and controls current flow through the load using an N-channel MOSFET placed between the supply and the load. Within the broader component taxonomy, the BSP742RXUMA1 sits in the PMIC (Power Management IC) category as a power distribution switch / load driver, distinct from low-side switches (which sit between load and ground) and from DC-DC converters (which actively regulate voltage). High-side switches are preferred in automotive body electronics because they safely disconnect the load from the battery in fault conditions and prevent dangerous "load on ground" situations.
Key specifications include 400 mA continuous load current, 70 mΩ typical R_DS(on) at 25°C, embedded protection features (overload, short-circuit, thermal shutdown with auto-restart, overvoltage including load-dump, and reverse-battery protection), and CMOS-compatible logic inputs with both active-high and active-low versions. The device also integrates fast demagnetization of inductive loads, making it ideal for driving relays, solenoids, valves, and small motors without external freewheeling diodes.
The BSP742RXUMA1 uses Infineon's vertical DMOS process with charge-pump gate drive to deliver a true high-side switch in a compact 8-pin SO package. Its diagnostic feedback output reports fault status back to the microcontroller, supporting ISO 26262-style functional-safety architectures. The wide 5 V to 34 V operating range covers automotive cranking transients and 24 V truck/bus systems, while the low 5 µA quiescent current minimizes parasitic battery drain.
Typical applications include automotive body electronics (door modules, seat control, mirror heaters), 24V industrial automation loads, programmable logic controller (PLC) digital outputs, and any 12V/24V load-driving circuit requiring embedded protection. The device is pin-to-pin compatible with other members of the Infineon PROFET family such as BSP742R, allowing designers to scale current per channel without PCB rework.
When designing with this device, observe the maximum junction temperature of 150°C and derate load current aggressively above 85°C ambient. The input pins accept 3.3V or 5V CMOS logic directly; tie the input pin to Vbb through a pull-up resistor if left floating to prevent unwanted turn-on. Always place a reverse-polarity protection diode or use the part's internal reverse-battery feature with proper heat-sinking.
This page synthesizes real-time distributor pricing, drop-in compatible pin-to-pin alternatives from the Infineon Classic PROFET family and key competitors, and practical PCB/protection design notes that go beyond the manufacturer datasheet's typical application circuit.
Drop-in alternatives for BSP742RXUMA1 — 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 BSP742RXUMA1 (same form factor and footprint) — differing in Package, Product Type, Operating Temperature Range, Protection Features, Diagnostic Output.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BSP742RIXUMA1
✅ Drop-In✓ In Stock
$0.96 / Unit
View Datasheet →BSP742RIXUMA1
✅ Drop-In✓ In Stock
$0.96 / Unit
View Datasheet →BSP742TXUMA1
✅ Drop-In📋 Reference alternative (not in catalog)
BSP7720XUMA1
✅ Drop-In📋 Reference alternative (not in catalog)
BTS3046SDRATMA1
✅ Drop-In✓ In Stock
$0.74 / Unit
View Datasheet →BSP742RXUMA1 Maximum Ratings & Electrical Characteristics
| Product Type | Smart High-Side Power Switch |
| Topology | 1:1 N-Channel High-Side Switch |
| Operating Voltage Range (Vbb) | 5 V to 34 V |
| Continuous Load Current | 400 mA |
| On-Resistance R_DS(on) (typ) | 70 mΩ |
| Quiescent Current (Iq typ) | 5 µA |
| Input Type | CMOS-compatible logic, active-high |
| Operating Temperature Range | -40°C to +150°C (TJ) |
| Package | PG-DSO-8-6 (8-pin SOIC, exposed pad variant) |
| Mounting Type | Surface Mount |
| AEC-Q100 Qualification | Qualified (Automotive Grade) |
| Protection Features | Overload, Short-Circuit, Thermal Shutdown with Restart, Overvoltage (Load Dump), Reverse Battery |
| Diagnostic Output | Yes (Status / Fault feedback) |
| Inductive Load Switching | Fast demagnetization integrated |
| RoHS Compliance | Compliant |
| MSL Moisture Sensitivity Level | MSL 2 (per JEDEC J-STD-020) |
BSP742RXUMA1 Pin Configuration
| Pin 1 | OUT — Power output to load |
| Pin 2 | NC — Not connected (per datasheet) |
| Pin 3 | IN — Logic input (CMOS, active-high) |
| Pin 4 | GND — Ground reference |
| Pin 5 | ST — Status / diagnostic output |
| Pin 6 | NC — Not connected (per datasheet) |
| Pin 7 | Vbb — Battery / supply voltage (5-34V) |
| Pin 8 | Vbb — Battery / supply voltage (5-34V, pin paralleled with pin 7) |
Typical Applications
BSP742RXUMA1 is suitable for 6 applications: Automotive Body Electronics (Door Modules, Mirror Heaters, Seat Control), 24V Industrial Automation and PLC Digital Outputs, Relay and Solenoid Driver Replacement, LED Lighting Modules and Indicator Drivers, USB Port Power Distribution and Hot-Swap Control, IoT Sensor Power Switching and Battery Management.
Automotive Body Electronics (Door Modules, Mirror Heaters, Seat Control)
The BSP742RXUMA1 is a workhorse for 12V automotive body-electronics loads such as door lock actuators, mirror heaters, seat-positioning motors, and interior lighting. Its 400 mA continuous current matches typical relay and small-motor coil currents, and the 5-34V operating range survives cold-crank (6V) and load-dump (40V) transients per ISO 7637. The integrated reverse-battery protection eliminates the need for an external blocking diode at the Vbb input, and AEC-Q100 qualification allows direct deployment under the hood or in cabin modules.
Recommended
24V Industrial Automation and PLC Digital Outputs
In 24V industrial PLCs, the BSP742RXUMA1 replaces electromechanical relays as a solid-state digital output, providing 400 mA per channel with built-in short-circuit and overload protection that would otherwise require external fuses. The PG-DSO-8-6 surface-mount package allows high-density 8-, 16-, or 32-channel output modules on a compact PCB. The CMOS-compatible input pin interfaces directly to 3.3V or 5V logic from any microcontroller, and the diagnostic status output flags open-load and thermal faults back to the PLC CPU for predictive maintenance.
Recommended
Relay and Solenoid Driver Replacement
The BSP742RXUMA1 is a drop-in solid-state replacement for mechanical relays and discrete MOSFET + flyback diode circuits driving 12V/24V relays, solenoids, and small valves. The integrated fast-demagnetization clamp absorbs the inductive kickback when the coil de-energizes, eliminating the external freewheeling diode. Designers benefit from a smaller PCB footprint, no moving parts to fail, no contact bounce, and silent switching. The 5-34V Vbb range covers both 12V automotive and 24V industrial relay coils with a single part number.
Recommended
LED Lighting Modules and Indicator Drivers
The BSP742RXUMA1 drives 12V/24V LED strings up to 400 mA in automotive tail-light, interior-ambient, and industrial indicator applications. Its 70 mΩ R_DS(on) minimizes voltage drop and power dissipation across the FET, while the integrated PWM capability (via the input pin) allows dimming without external current-setting resistors. The thermal shutdown with auto-restart protects the LED string from fault conditions, and the diagnostic output reports open-LED and short-LED events back to the lighting ECU. AEC-Q100 grade makes it a natural fit for exterior lighting.
Recommended
USB Port Power Distribution and Hot-Swap Control
The BSP742RXUMA1 serves as a per-port USB VBUS power switch in 12V-powered hubs, automotive infotainment USB ports, and 24V industrial USB chargers. Its 400 mA matches USB 2.0 downstream port requirements, and the integrated current limit and thermal shutdown protect the host from shorted cables or faulty devices. The 5-34V Vbb range is over-specified for 5V VBUS rails and instead works upstream of a 5V buck regulator, switching the 12V input to the regulator. The fault output drives a per-port LED indicator or host interrupt.
Recommended
IoT Sensor Power Switching and Battery Management
The BSP742RXUMA1's 5 µA quiescent current and 5-34V Vbb range make it ideal for IoT edge nodes and remote sensor modules that need to switch 12V battery or solar-supply rails to sub-circuits on demand. A microcontroller GPIO wakes up, enables the PROFET, powers the sensor array, and then disables it for sleep modes, extending battery life by orders of magnitude. The reverse-battery protection is critical for field-replaceable battery packs, and the diagnostic output flags sensor short-circuit events to the host MCU for remote diagnostics.
Recommended
Recommended Products Summary
Engineering reference data for BSP742RXUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BSP742R | BSP742RIXUMA1 | BSP742TXUMA1 | BSP7720XUMA1 | BTS3046SDRATMA1 |
|---|---|---|---|---|---|---|
| Package | PG-DSO-8-6 (SO-8 with exposed pad) | PG-DSO-8-6 - same | PG-DSO-8-6 - same | PG-DSO-8-6 - same | PG-DSO-8-6 - same | PG-DSO-8-6 - same |
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon |
| Continuous Load Current | 400 mA | 400 mA | 400 mA | 400 mA | 1.5 A | 2 A (typ), derated to 0.4A for drop-in |
| R_DS(on) typical | 70 mΩ | 70 mΩ | 70 mΩ | 70 mΩ | 50 mΩ (higher current die) | 30 mΩ (higher current die) |
| Operating Voltage Range (Vbb) | 5 V to 34 V | 5 V to 34 V | 5 V to 34 V | 5 V to 34 V | 5 V to 34 V | 5 V to 34 V |
| Input Polarity | Active-High | Active-High | Active-Low | Active-High | Active-High | Active-High |
| AEC-Q100 Qualification | Yes | Yes | Yes | Yes | Yes | Yes |
| Diagnostic Output | Yes (ST pin) | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Tightest 400 mA spec in the Classic PROFET family with full protection integration (vs BSP7720XUMA1)
- Active-high logic matches standard microcontroller GPIO convention (vs BSP742RIXUMA1)
- Integrated fast demagnetization for inductive loads (vs Discrete N-MOSFET + flyback diode design)
- True reverse-battery protection without external blocking diode (vs Discrete N-MOSFET high-side switch)
Design Notes
Estimated: At Vbb=14V, Vload=12V (relay coil), 400 mA continuous, the BSP742RXUMA1 dissipates (14V - Vload_drop) × 0.4A. With 70 mΩ R_DS(on), conduction loss alone is ~11 mW; total dissipation including switching losses is typically <100 mW at DC, well within the PG-DSO-8-6 thermal envelope. Above 85°C ambient, derate load current linearly to keep TJ below 150°C. The exposed pad must be soldered to a copper pour of at least 50 mm² for proper heat-sinking per the Infineon application note.
Place a 100 nF ceramic decoupling capacitor as close as possible to the Vbb pin (pin 7/8) to suppress supply transients from the load-dump clamp. Add a 10 µF bulk capacitor on Vbb if the upstream wiring is longer than 50 mm. Route the GND pin (pin 4) directly to the system ground plane with a short, wide trace. The exposed pad (tab) must be soldered for both thermal performance and mechanical reliability; do not rely on the lead-frame alone for heat removal.
Do not leave the IN pin floating — an undriven IN pin can drift to mid-supply and partially enhance the FET, causing excess dissipation. Tie IN to GND with a 100 kΩ pull-down if driven by a high-impedance source. The reverse-battery protection is implemented via an internal MOSFET body diode; this means the Vbb pin can sink current in reverse polarity, so a series reverse-blocking diode may be required if the upstream fuse rating is below 5A. The status output (ST pin) is open-drain in most variants and requires a pull-up to logic supply.
The integrated overvoltage clamp protects against ISO 7637-2 load-dump pulses up to 40V for 400 ms; verify your specific test pulse profile against the Infineon application note. The short-circuit protection latches at approximately 1.5-2× the rated current, so a 400 mA part will trip at ~600-800 mA. After a thermal shutdown event, the device auto-restarts once the junction cools by 10°C hysteresis — this is intentional behavior for incandescent lamp loads but may require firmware debouncing for sensitive fault-logging applications.
Compliance Information
AEC-Q100 qualified for automotive 12V body electronics per Infineon product page. RoHS and REACH compliant. Lead-free (Pb-free) reflow-compatible per JEDEC J-STD-020 MSL 2. Halogen-free per IEC 61249-2-21. Conflict-mineral reporting compliant under the Dodd-Frank Act Section 1502.
