BTS500071LUAAUMA1 - 55A Smart High-Side Switch | Infineon
MPN: BTS500071LUAAUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.78 | $57.80 |
| 100 | $5.13 | $513.00 |
| 500 | $4.62 | $2,310.00 |
| 1,000 | $4.1 | $4,100.00 |
BTS500071LUAAUMA1 Overview
A high-side smart switch (also called an intelligent high-side switch or IHSS) is a semiconductor power switch placed between the positive supply rail and the load, replacing mechanical relays and discrete MOSFETs with a fully protected solid-state alternative. Within the broader component taxonomy, the BTS500071LUAAUMA1 belongs to: high-side switch -> intelligent load driver -> power distribution switch -> power management IC -> semiconductor device. By integrating the power MOSFET, gate driver, current sensing, and protective logic in one die, smart high-side switches reduce PCB area, eliminate wiring harness weight, and provide MCU-readable fault diagnostics for body-electronics ECUs.
Key features include a 55 A continuous current rating, 0.7 mΩ typical RDS(on) at 25 °C, dedicated current-limit and overload shutdown, over-temperature protection with auto-restart, over-voltage clamp at VDS, and ground-loss robustness. The PG-HSOF-8-5 package provides a top-side exposed pad that delivers an exceptionally low thermal resistance, enabling the 55 A rating without external heatsinking on properly designed copper pours. Reverse ON capability protects the device and downstream loads during accidental reverse-polarity battery connection.
Architecturally, the BTS500071LUAAUMA1 uses Infineon's N-channel Power PROFET+ trench MOSFET with integrated charge pump, current-sense mirror, and embedded protective state machine. The IS pin provides proportional analog load-current feedback to the MCU ADC, enabling closed-loop current monitoring for predictive maintenance and fault pre-warning. The diagnostic pin reports overtemperature, open load, and short-to-ground conditions through standard Infineon KN/SPI protocols.
Typical applications include automotive body control modules, HVAC blower control, seat-heater drivers, and 12 V industrial solenoid/valve drivers. The AEC-Q100 qualification and 12 V optimized RDS(on) make it ideal for replacing electromechanical relays in vehicle electrical systems.
Design considerations include proper PCB thermal design—minimum 6 cm² of 2 oz copper on the exposed pad is recommended for full 55 A operation. Place a 100 nF ceramic decoupling capacitor within 5 mm of the Vbb pin to suppress load-dump transients.
This page synthesizes distributor pricing, parametric alternatives, and practical PCB layout guidance not found in the manufacturer datasheet, plus a comparison with related PROFET+ family members.
Drop-in alternatives for BTS500071LUAAUMA1 — 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 BTS500071LUAAUMA1 (same form factor and footprint) — differing in Number of Channels, On-State Resistance (RDS(on)), Operating Temperature, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BTS50010-1LUA
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
BTS50015-1TMA
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
BTS70001EPC
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
BTS70001EPCXUMA1
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
BTS72404EPAXUMA1
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
BTS51202EKAXUMA1
✅ Drop-In✓ In Stock
$1.68 / Unit
View Datasheet →BTS500071LUAAUMA1 Maximum Ratings & Electrical Characteristics
| Product Type | Smart High-Side Power Switch |
| Series | Power PROFET+ 12 V |
| Number of Channels | 1 |
| Output Configuration | High Side |
| On-State Resistance (RDS(on)) | 0.7 mΩ (typical) |
| Continuous Load Current | 55 A |
| Operating Supply Voltage | 5.8 V to 18 V |
| Switch Type | N-Channel Power MOSFET |
| Input Type | Non-Inverting |
| Reverse ON Protection | Yes (Reverse Battery Protection) |
| Operating Temperature | -40 °C to +150 °C (TJ) |
| Package | PG-HSOF-8-5 (8-pin + exposed tab) |
| Mounting Type | Surface Mount |
| Fault Protection | Current Limiting, Over-Temperature, Over-Voltage, Open Load |
| Automotive Qualification | AEC-Q100 |
| RoHS Status | Compliant |
BTS500071LUAAUMA1 Pin Configuration
| Pin 1 | OUT — Switched output to load (drain of internal power MOSFET) |
| Pin 2 | IS — Current sense / diagnostic feedback output (analog current mirror) |
| Pin 3 | IN — Logic input - active high enables the switch |
| Pin 4 | GND — Logic ground reference for IN and IS pins |
| Pin 5 | Vbb — Battery / supply voltage input (also connected to exposed pad) |
| Pin 6 | NC — Not connected (per datasheet) |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | NC — Not connected (per datasheet) |
Typical Applications
BTS500071LUAAUMA1 is suitable for 6 applications: Automotive HVAC Blower Control, Seat Heater Driver, Industrial 12 V Solenoid / Valve Driver, DC Load Switch / Solid-State Relay, LED Lighting Driver (Automotive Headlamp / Tail Lamp), Power Distribution / ECUs.
Automotive HVAC Blower Control
The BTS500071LUAAUMA1's 0.7 mΩ RDS(on) and 55 A continuous rating make it well-matched to automotive HVAC blower motor control, where typical load current ranges 15-30 A on cold-start and resistance varies with fan speed. Placed between the 12 V battery rail and the blower motor, the smart switch replaces legacy electromechanical relays and provides MCU-readable current-sense feedback via the IS pin, enabling closed-loop airflow regulation. Compared to a discrete MOSFET + shunt solution, the integrated BTS500071LUAAUMA1 cuts PCB area by roughly 60 % and adds overtemperature, overcurrent, and reverse-battery protection with zero external protection components. Infineon's PROFET+ diagnostic protocol also reports open-load and short-to-ground faults, critical for OEM warranty reduction.
Recommended
Seat Heater Driver
The BTS500071LUAAUMA1 is ideal for automotive seat-heater driver modules, where 8-15 A resistive heating loads demand low conduction loss and AEC-Q100 robustness. With 0.7 mΩ RDS(on) at typical 12 A draw, conduction loss is only ~0.1 W, supporting fully on-state operation with negligible thermal rise on the PG-HSOF-8-5 exposed pad. The integrated current-sense output allows the MCU to detect partial heater-element failures (open-load, increased resistance) before the user notices degraded comfort. Reverse ON protection also guards the seat module against reverse-polarity jump-start events common in service-bay battery replacement.
Recommended
Industrial 12 V Solenoid / Valve Driver
The BTS500071LUAAUMA1 drives 12 V industrial hydraulic solenoids and pneumatic valves at currents up to 55 A, replacing mechanical contactors and reducing switching wear. Its 5.8 V to 18 V supply range covers both nominal 12 V and 24 V industrial battery transients (when protected externally by TVS), while the 0.7 mΩ RDS(on) keeps coil-supply voltage drop under 50 mV even at full load. The device's reverse-polarity protection and ground-loss robustness are critical for field-deployed industrial equipment exposed to wiring faults. Integrated diagnostic feedback enables predictive maintenance to flag degrading solenoid coils before catastrophic failure.
Recommended
DC Load Switch / Solid-State Relay
The BTS500071LUAAUMA1 functions as a solid-state replacement for automotive 12 V electromechanical relays in body control modules, switching resistive and inductive loads without contact bounce or arcing. Its 55 A continuous rating supports applications such as trailer lighting, auxiliary power outlets, and rear-window defrosters where legacy relays would otherwise be needed. Integrated protection (overcurrent, over-temperature, over-voltage clamp) reduces the need for discrete fusing and TVS components, lowering BOM cost and assembly time. Reverse ON ensures the load and switch survive accidental reverse-battery wiring during service.
Recommended
LED Lighting Driver (Automotive Headlamp / Tail Lamp)
The BTS500071LUAAUMA1 drives high-power automotive LED headlamp and tail-lamp modules at typical 5-20 A string currents, providing PWM dimmability via the IN pin at up to 1 kHz with stable current-sense feedback. The 0.7 mΩ RDS(on) and PG-HSOF-8-5 thermal performance support continuous LED-string operation without external heatsinking on 6 cm² copper pours, reducing lamp-housing thermal load. Fault diagnostics detect open-LED-string conditions, critical for safety compliance with FMVSS 108 and ECE R7/R48 photometric standards. The AEC-Q100 qualification also satisfies OEM automotive lighting reliability requirements.
Recommended
Power Distribution / ECUs
The BTS500071LUAAUMA1 serves as the primary or secondary high-side switch in 12 V automotive power distribution ECUs, energizing downstream sub-modules (lighting controllers, sensor nodes, accessory modules) with full diagnostic feedback to the central BCM. With 0.7 mΩ RDS(on) and 55 A continuous rating, a single BTS500071LUAAUMA1 can replace an entire relay-and-fuse sub-assembly. The reverse ON capability protects the ECU during jump-start polarity reversals. AEC-Q100 qualification and the wide 5.8 V-18 V operating range also make it suitable for off-road, agricultural, and marine 12 V power distribution.
Recommended
Recommended Products Summary
Engineering reference data for BTS500071LUAAUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTS50010-1LUA | BTS50015-1TMA | BTS70001EPC | BTS51202EKAXUMA1 |
|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon |
| Package | PG-HSOF-8-5 (8+Tab) | PG-HSOF-8-5 - same | PG-HSOF-8-5 - same | PG-HSOF-8-5 - same | PG-HSOF-8-5 - same |
| On-State Resistance (typ) | 0.7 mΩ | 0.7 mΩ | 0.7 mΩ | 1.6 mΩ | 12 mΩ |
| Continuous Load Current | 55 A | 40 A | 55 A | 17 A | 5.5 A (per channel) |
| Operating Voltage | 5.8 V to 18 V | 5.8 V to 18 V | 5.8 V to 18 V | 5.8 V to 18 V | 5.8 V to 18 V |
| Reverse Battery Protection | Yes (Reverse ON) | No | Yes | No | No |
| Number of Channels | 1 | 1 | 1 | 1 | 2 |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Reverse ON capability for reverse-battery robustness (vs BTS50010-1LUA)
- 55 A continuous current in PG-HSOF-8-5 footprint (vs BTS70001EPC)
- Ultra-low 0.7 mΩ RDS(on) (vs BTS51202EKAXUMA1)
Design Notes
Estimated: at 30 A continuous load with 0.7 mΩ RDS(on), conduction loss is P = I² × RDS = 30² × 0.0007 ≈ 0.63 W. The PG-HSOF-8-5 exposed pad requires a minimum 6 cm² of 2 oz copper on top + bottom PCB layers to keep junction temperature rise below 50 °C. For sustained 55 A operation, expand the copper pour to 10 cm² or add a thermal via array (≥25 vias, 0.3 mm drill) directly under the exposed pad to inner copper planes.
Place a 100 nF X7R ceramic decoupling capacitor within 5 mm of the Vbb pin to absorb load-dump and reverse-battery transient energy. Use wide copper traces (≥3 mm per 10 A) on OUT and Vbb to minimize parasitic inductance. Keep the IS pin trace short and away from switching nodes to prevent capacitive coupling that distorts current-sense readings. The exposed pad must be soldered with a thermal pad land pattern per Infineon's PG-HSOF-8-5 footprint recommendation.
Do not parallel multiple BTS500071LUAAUMA1 devices without current-balancing resistors - the 0.7 mΩ tolerance band allows significant current hogging. The IS pin is a current mirror output, NOT a logic level; route through a small-signal resistor (typically 1 kΩ) to a microcontroller ADC, not directly to a digital input. Reverse ON means the device conducts during reverse-battery events; place an inline fuse upstream to limit fault current and protect downstream wiring harnesses. Always verify the IS pin diagnostics on prototype units - some MCU ADC channels require scaling resistor tuning to use the full diagnostic dynamic range.
The BTS500071LUAAUMA1 can generate fast dV/dt edges (typically 1-5 V/ns) on the OUT pin during turn-off, especially with inductive loads. Add a snubber network (1 kΩ + 10 nF) or TVS diode (e.g., 24 V SMAJ24A) across inductive loads to suppress ringing and meet CISPR 25 automotive EMC requirements. For PWM dimming, limit switching frequency to ≤1 kHz for LED loads and ≤400 Hz for solenoid/relay loads to keep EMI below automotive emission limits.
Compliance Information
AEC-Q100 qualified per Infineon product page for automotive applications. RoHS and REACH compliant per distributor listings (DigiKey, Mouser, Arrow).
