AUIR3242STRXUMA1 - High-Side MOSFET Driver | Infineon
MPN: AUIR3242STRXUMA1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.55 | $35.50 |
| 100 | $3.15 | $315.00 |
| 500 | $2.8 | $1,400.00 |
| 1,000 | $2.5 | $2,500.00 |
AUIR3242STRXUMA1 Overview
A high-side MOSFET driver is a specialized gate-driver IC that switches the gate of an N-channel MOSFET referenced to the positive supply rail rather than ground. This topology simplifies low-side wiring, reduces ground-loop noise, and protects downstream loads from ground-shift faults. The AUIR3242S family belongs to a broader hierarchy of gate drivers within Infineon's automotive power-management portfolio, sitting alongside half-bridge and bootstrap-based high-side drivers.
Key features include reverse-battery protection, very low quiescent current, internal boost converter, and automotive-grade qualification per Infineon's reliability standards. The non-inverting logic input makes relay replacement straightforward, and the wide 3V-36V input range covers 12V and 24V automotive buses with load-dump margin. The PG-DSO-8-907 surface-mount package offers compact footprint and good thermal performance for under-hood PCB layouts.
The driver combines a charge-pump/boost converter using a small external inductor with a gate-driver output stage. The boost topology generates VGS above VIN, ensuring full enhancement of standard N-channel MOSFETs even when battery voltage sags during cranking. Reverse-battery protection blocks destructive current flow if the supply polarity is reversed during service or jump-start events.
Typical applications include back-to-back N-channel MOSFET switches in automotive body modules, battery isolation switches, eFuse replacements, relay replacement circuits, and load-driving in BCM (body control modules). The low Iq enables permanent connection to battery without significant quiescent drain, satisfying modern vehicle quiescent-current budgets.
Designers should select an external inductor and bootstrap/charge-pump capacitor per the datasheet's typical-application circuit to ensure stable boost operation. Reverse-battery protection eliminates the need for an external blocking diode in most 12V systems, reducing BOM count and board area. The input control pin can be driven directly from a microcontroller GPIO or a logic-level signal.
Drop-in alternatives for AUIR3242STRXUMA1 β 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 AUIR3242STRXUMA1 (same form factor and footprint) β differing in Package, Driver Configuration, Input Logic Compatibility, Number of Drivers, Topology.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
AUIR3241STRXUMA1
β Drop-Inπ Reference alternative (not in catalog)
AUIR3242STR
β Drop-Inπ Reference alternative (not in catalog)
AUIRS3241STR
β Drop-Inπ Reference alternative (not in catalog)
IRS21867STRPBF
β Drop-Inβ In Stock
$1.55 / Unit
View Datasheet βIR2109SPBF
β Drop-Inβ In Stock
$1.05 / Unit
View Datasheet βAUIR3242STRXUMA1 Maximum Ratings & Electrical Characteristics
| Function | High-Side MOSFET Driver |
| Driver Configuration | High-Side, Non-Inverting |
| Number of Drivers | 1 |
| Input Voltage Range | 3 V to 36 V |
| Topology | Back-to-Back N-Channel MOSFET Driver with Boost Converter |
| Quiescent Current | Very low (ON and OFF state) |
| Reverse Battery Protection | Yes |
| Input Logic | Non-Inverting, Active-Low (per AUIR3242 family description) |
| External Components Required | Inductor for boost converter |
| Package | PG-DSO-8-907 (8-pin SOIC, 3.90 mm body width) |
| Mounting Type | Surface Mount |
| Automotive Qualified | Yes (Infineon automotive grade) |
| RoHS Status | Compliant |
AUIR3242STRXUMA1 Pin Configuration
| Pin 1 | VCC β Supply voltage input (3V to 36V) |
| Pin 2 | GND β Ground reference |
| Pin 3 | IN β Logic input (active-low for AUIR3242) |
| Pin 4 | NC β Not connected (per datasheet) |
| Pin 5 | SW β Boost converter switch node (to external inductor) |
| Pin 6 | BST β Boost output / gate-drive supply |
| Pin 7 | OUT β Gate driver output to MOSFET gate |
| Pin 8 | VS β Source sense / load voltage reference |
Typical Applications
AUIR3242STRXUMA1 is suitable for 6 applications: Automotive Body Control Module (BCM) Load Driver, Solid-State Relay Replacement, Battery Isolation Switch / eFuse, Industrial 24V Load Switch, LED Driver High-Side Switch, Power Distribution Module (PDM).
Automotive Body Control Module (BCM) Load Driver
The AUIR3242STRXUMA1 drives back-to-back N-channel MOSFETs in BCM outputs for lighting, door locks, and seat controllers. Its 3-36V input range tolerates cold-cranking sags and load-dump surges on 12V automotive buses, while the integrated boost converter fully enhances standard MOSFETs even at low battery voltage. Very low quiescent current satisfies always-on BCM modules that must minimize key-off parasitic drain, and reverse-battery protection removes the external blocking diode, reducing BOM count and PCB area in space-constrained BCMs.
Recommended
Solid-State Relay Replacement
The AUIR3242STRXUMA1 is explicitly designed for drop-in relay replacement because its active-low input mimics a relay coil driven to ground. Replacing an electromechanical relay with a back-to-back MOSFET solid-state switch using this driver gives silent operation, unlimited switching cycles, and far lower quiescent current than a relay coil. The integrated reverse-battery protection makes the swap safe in 12V/24V automotive junction boxes where wiring faults during service are common.
Recommended
Battery Isolation Switch / eFuse
In battery-isolation and eFuse circuits, the AUIR3242STRXUMA1 drives back-to-back MOSFETs that disconnect the battery during crash events or service. Reverse-battery protection prevents destructive current flow if the supply is reversed, and the wide 3-36V input range tolerates jump-start transients. The driver's low Iq keeps the isolation circuit's parasitic drain near zero when the vehicle is parked, which is critical for meeting modern 80 uA quiescent-current budgets.
Recommended
Industrial 24V Load Switch
Beyond automotive, the AUIR3242STRXUMA1 fits 24V industrial load-switch applications such as PLC outputs, solenoid drivers, and field-I/O modules. Its 36V absolute-maximum input covers 24V bus transients, and the integrated boost converter eliminates the need for an external gate-drive supply. Very low quiescent current supports battery-backed or energy-harvesting industrial systems where standby drain dominates total energy budget.
Recommended
LED Driver High-Side Switch
Driving high-brightness LED strings from the high side simplifies wiring and keeps the LED string referenced to chassis ground. The AUIR3242STRXUMA1's integrated boost converter ensures full enhancement of the high-side N-MOSFET even at low supply, avoiding the dimming artifacts caused by partial VGS. Reverse-battery protection is essential for automotive exterior lighting, where wiring harness faults can reverse polarity during service.
Recommended
Power Distribution Module (PDM)
In automotive power-distribution modules that replace fuses and relays with solid-state switches, the AUIR3242STRXUMA1 drives back-to-back MOSFETs for each protected output. Per-channel fault isolation is achieved by combining the driver with a current-sense amplifier and MCU. The driver's automotive qualification, low Iq, and reverse-battery protection make it a strong fit for centralized PDMs that must survive harsh under-hood electrical environments.
Recommended
Recommended Products Summary
Engineering reference data for AUIR3242STRXUMA1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AUIR3241STRXUMA1 | AUIR3242STR | AUIRS3241STR | IRS21867STRPBF | IR2109SPBF |
|---|---|---|---|---|---|---|
| Package | PG-DSO-8-907 (SOIC-8) | PG-DSO-8-907 (SOIC-8) - same | PG-DSO-8-907 (SOIC-8) - same | PG-DSO-8-907 (SOIC-8) - same | SOIC-8 - same | SOIC-8 - same |
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Driver Configuration | Single high-side, non-inverting | Single high-side, non-inverting (active-HIGH input) | Single high-side, non-inverting - same | Single high-side (active-HIGH, battery-direct drive) | Half-bridge high/low-side | Half-bridge high/low-side with bootstrap |
| Input Voltage Range | 3V to 36V | 3V to 36V | 3V to 36V | 3V to 36V | 10V to 20V (bootstrap supply) | 10V to 20V (bootstrap supply) |
| Gate Drive Topology | Internal boost converter + external inductor | Internal boost converter + external inductor | Internal boost converter + external inductor | Internal boost converter + external inductor | Bootstrap (external diode + cap) | Bootstrap (external diode + cap) |
| Reverse Battery Protection | Yes (integrated) | Yes (integrated) | Yes (integrated) | Yes (integrated) | No (external required) | No (external required) |
| Automotive Qualified | Yes | Yes | Yes | Yes | Industrial grade | Industrial grade |
Key Differentiators
- Integrated boost converter for back-to-back topology (vs IR2109SPBF)
- Reverse battery protection on-chip (vs IRS21867STRPBF)
- Very low quiescent current in OFF state (vs AUIR3241STRXUMA1)
Design Notes
The AUIR3242STRXUMA1's integrated boost converter requires an external inductor chosen per the Infineon datasheet's component-selection table. Estimated: with VIN=12V, VGS target=10V, and switching frequency in the hundreds of kHz range, a 10-47 uH inductor with low DCR (under 0.5 ohm) and saturation current above the peak switch current is typical. Inductor placement must minimize loop area with the BST pin and the BST capacitor to reduce EMI.
Estimated: the PG-DSO-8-907 package's theta_JA is approximately 100-150 C/W on a standard JEDEC 2s2p board. Under steady-state switching at 200 kHz with 50 mA gate-drive current, internal dissipation stays well under 100 mW, so no heatsink is required. If the driver is forced to operate in a fault condition with the external MOSFET shorted, internal dissipation can rise quickly - ensure the PCB copper pour on the GND pin is generous (at least 0.25 sq.in.) for heat spreading.
Place the external inductor and BST capacitor as close as possible to the SW and BST pins to minimize high-frequency switching-loop area. Use a ground plane on the layer directly under the driver and keep the gate-drive output trace short and wide to the MOSFET gate. Add a small series gate resistor (10-47 ohm) close to the OUT pin to damp ringing caused by the gate-source capacitance and stray inductance of the MOSFET package leads.
Do not omit the BST capacitor - without it the boost converter cannot generate gate-drive voltage and the MOSFET will not fully enhance, causing excessive Rds(on) and thermal failure. Do not parallel the AUIR3242's input with long cables without proper filtering, since automotive transients can inject voltage spikes that exceed the 36V absolute-maximum rating. Always include a reverse-battery blocking verification test during validation, even though protection is integrated.
Compliance Information
RoHS and REACH compliant per distributor listings. AEC-Q100 qualified for automotive applications - part of Infineon's AUIR automotive product line. Halogen-free status not explicitly stated in available data.
