BSP78HUMA1 - 42V 3A Smart Low-Side Switch | Infineon HITFET
MPN: BSP78HUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.91 | $1.91 |
| 10 | $1.62 | $16.20 |
| 100 | $1.18 | $118.00 |
| 500 | $0.95 | $475.00 |
| 1,000 | $0.75 | $750.00 |
| 3,000 | $0.62 | $1,860.00 |
Drop-in alternatives for BSP78HUMA1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BSP75N
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
BTS3050EJ
✅ Drop-In📋 Reference alternative (not in catalog)
BTS452RATMA1
✅ Drop-In✓ In Stock
$0.85 / Unit
View Datasheet →ITS4142NHUMA1
✅ Drop-In✓ In Stock
$0.88 / Unit
View Datasheet →BTS452RATMA1
✅ Drop-In✓ In Stock
$0.85 / Unit
View Datasheet →BSP88H6327XTSA1
✅ Drop-In✓ In Stock
$0.21 / Unit
View Datasheet →BSP78HUMA1 Maximum Ratings & Electrical Characteristics
| Technology | Smart SIPMOS (N-channel vertical power FET) |
| Function | Self-protected low-side power switch |
| Operating Supply Voltage (Vbb) | 4.5 V to 42 V |
| Continuous Load Current | Up to 3 A |
| On-state Resistance (Rds(on)) | 200 mΩ typical |
| Input Logic Level | Logic-level (3.3 V / 5 V compatible) |
| Current Limitation | Yes (internal) |
| Thermal Shutdown | Yes (with auto-restart) |
| Overvoltage Protection | Yes (load-dump tolerant) |
| Short-circuit Protection | Yes |
| Overload Protection | Yes |
| ESD Protection | Yes (on input pin) |
| Diagnostic Output | Open-drain status flag |
| Operating Junction Temperature | -40 °C to +150 °C |
| Package | PG-SOT223-4 (TO-261-4) with exposed tab |
| Mounting Type | Surface Mount |
| AEC-Q100 Qualification | Qualified |
| RoHS Status | Compliant (Green product) |
BSP78HUMA1 Pin Configuration
| Pin 1 | IN — Logic-level input (3.3 V / 5 V CMOS compatible) |
| Pin 2 | GND — Ground / source connection (also tied to tab) |
| Pin 3 | Vbb — Supply / battery voltage (4.5 V to 42 V) |
| Pin 4 | STATUS — Open-drain diagnostic output (fault flag) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
BSP78HUMA1 is suitable for 6 applications: Automotive Body Control Module (BCM) Outputs, Industrial 24V Solenoid and Valve Drivers, Automotive LED Lighting Modules, Relay and Contactor Replacement, Heating Element Control (Seat Heaters, Mirror Heaters), DC Motor Direction Control (Low-Side Half-Bridge).
Automotive Body Control Module (BCM) Outputs
The BSP78HUMA1 is purpose-built for automotive BCM outputs driving 12 V resistive and inductive loads such as door lock actuators, mirror heaters, and small lamp clusters. Its 42 V load-dump tolerance handles ISO 7637-2 transient pulses without external TVS clamps, and 200 mΩ Rds(on) at 3 A keeps conduction loss around 1.8 W - manageable on a 1 sq-in copper pour. AEC-Q100 qualification allows direct use under the hood and inside cabin modules.
Recommended
Industrial 24V Solenoid and Valve Drivers
Industrial PLCs and process controllers use the BSP78HUMA1 to switch 24 V solenoid valves, pneumatic actuators, and hydraulic valves directly from a 3.3 V or 5 V logic output. Its integrated current limit protects against stalled actuators, and thermal shutdown with auto-restart prevents latch-up faults. The 42 V maximum gives margin over the 24 V nominal rail plus inductive flyback transients; designers should still add a TVS or flyback diode across the coil for reliability.
Recommended
Automotive LED Lighting Modules
The BSP78HUMA1 drives interior and exterior LED strings in 12 V automotive lighting - reading lamps, ambient strips, and turn-signal indicator LEDs. Logic-level input connects directly to an LED-driver MCU GPIO, eliminating external gate drive. Current-limit protection guards against LED short-to-ground faults, and the 200 mΩ Rds(on) minimizes thermal rise in the compact SOT-223 footprint. PWM dimming is supported via the IN pin at frequencies up to several kHz.
Recommended
Relay and Contactor Replacement
In modern automotive and industrial designs, the BSP78HUMA1 replaces electromechanical relays with silent, bounce-free solid-state switching for loads up to 3 A. Compared with a 12 V automotive relay (~50 mA coil current, mechanical wear, EMI from contact arcing), the BSP78HUMA1 draws negligible input current, has no moving parts, and offers diagnostic feedback via the STATUS pin for fault detection.
Recommended
Heating Element Control (Seat Heaters, Mirror Heaters)
Resistive heating loads such as automotive seat heaters, mirror heaters, and rear-window defroster segments are ideal for the BSP78HUMA1. Continuous 3 A capability handles multi-amp heating elements; PWM input allows proportional temperature control. Internal thermal shutdown protects against blocked airflow or short-circuit faults, and the open-drain STATUS pin signals MCU for fail-safe shutoff. The exposed tab simplifies thermal management on the PCB.
Recommended
DC Motor Direction Control (Low-Side Half-Bridge)
Two BSP78HUMA1 devices in a low-side half-bridge configuration drive small DC motors in reversible applications such as automotive mirror adjusters, door lock motors, and HVAC blend-door actuators. Each device handles the inductive flyback independently via its internal protections. Logic-level inputs interface directly to an H-bridge controller or MCU GPIO pair. Alternative: use a dedicated full-bridge driver if PWM speed control is required.
Recommended
Recommended Products Summary
Engineering reference data for BSP78HUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BSP75N | BTS3050EJ | BTS452R | ITS4142NHUMA1 | BTS452RATMA1 | BSP88H6327XTSA1 |
|---|---|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon |
| Package | PG-SOT223-4 | PG-SOT223-4 - same | PG-SOT223-4 - same | PG-SOT223-4 - same | PG-SOT223-4 - same | PG-SOT223-4 - same | PG-SOT223-4 - same |
| Operating Voltage | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 42 V |
| Continuous Current | 3 A | 1.6 A | 3 A | 4 A (typical) | 1.4 A | 4 A (typical) | 0.5 A |
| Rds(on) Typical | 200 mΩ | 300 mΩ | 240 mΩ | 100 mΩ | 350 mΩ | 100 mΩ | [DATA_NEEDED] |
| Logic-Level Input | Yes (3.3 V / 5 V) | Yes | Yes | Yes | Yes | Yes | Yes |
| Diagnostic Output | Open-drain STATUS | Open-drain STATUS | Enhanced diagnostic | STATUS pin | STATUS pin | STATUS pin | STATUS pin |
| AEC-Q100 Qualified | Yes | Yes | Yes | Industrial | Yes | Yes | Yes |
| Thermal Shutdown | Yes (auto-restart) | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- 3 A continuous current in compact SOT-223-4 with full protection set (vs BSP75N)
- Better diagnostic granularity at similar price (vs BTS3050EJ)
- Drop-in compatible within Infineon HITFET family (vs BSP88H6327XTSA1)
Design Notes
Estimated: At 3 A continuous load with 200 mΩ Rds(on), the BSP78HUMA1 dissipates approximately 1.8 W. The PG-SOT223-4 has a junction-to-ambient thermal resistance around 60 C/W on a 1 sq-in 2 oz copper pour, giving a 108 C temperature rise above ambient. This stays inside the 150 C junction limit in typical automotive environments, but for sustained 3 A operation in enclosed modules, increase copper area to 2 sq-in minimum or derate to 2 A.
When switching inductive loads (solenoids, motors, relays) the BSP78HUMA1 low-side configuration means the collapsing magnetic field pulls the drain node BELOW ground - the part's 42 V rating is the maximum drain-to-source voltage, NOT the absolute maximum drain-to-ground. Always add a freewheeling diode across the inductive load or a TVS from drain to Vbb to clamp the flyback spike. Operating without a clamp can cause avalanche degradation of the internal N-channel FET.
Solder the PG-SOT223-4 exposed tab to a continuous copper pour on the PCB - this is the primary thermal path. Use multiple thermal vias under the tab to spread heat to internal ground planes. Place a 100 nF ceramic decoupling capacitor as close as possible to the Vbb pin to suppress supply transients, especially load-dump events. The STATUS pin requires an external pull-up resistor (typically 10 kΩ to MCU Vdd); floating it disables fault reporting.
Compliance Information
RoHS compliant (Green product per Infineon datasheet). AEC-Q100 qualified for automotive use. Lead-free and halogen-free per the manufacturer datasheet.
