BTT3050EJXUMA1 - 4A Smart Low-Side Switch | Infineon HITFET+24V
MPN: BTT3050EJXUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.56 | $1.56 |
| 10 | $1.4 | $14.00 |
| 100 | $1.18 | $118.00 |
| 500 | $0.99 | $495.00 |
| 1,000 | $0.85 | $850.00 |
BTT3050EJXUMA1 Overview
Key features include a wide operating input range of 6 V to 36 V, embedded protection functions (over-current, over-temperature, short-circuit, over-voltage, under-voltage lockout, and latch protection), plus an active-high logic-level input and an active-low diagnostic feedback pin. The device is specified for junction temperatures from -40 °C to +150 °C, suiting under-the-hood automotive environments.
The BTT3050EJXUMA1 belongs to the HITFET+24V family of smart low-side switches, which sit in the broader hierarchy of power distribution switches -> load drivers -> power management ICs. Low-side switching architectures return the load to battery ground, simplifying protection and ground-referenced diagnostics, and are widely used for resistive, inductive, and capacitive loads in body electronics, powertrain auxiliaries, and industrial 24 V systems.
Internally, an N-channel vertical MOSFET handles the load current while logic-level CMOS gates drive the protection, current-sensing, and thermal-foldback blocks. The exposed thermal pad (PG-TDSO-8-31) provides a low θJA path, allowing 4 A continuous operation without an external heatsink when soldered to adequate copper area on the PCB.
Typical applications include automotive body electronics (door locks, mirror heaters, seat controls), LED lighting drivers, 24 V industrial actuators, HVAC valves, and relay replacements. The integrated protection eliminates the need for external fuses or TVS clamp networks on every load branch, reducing BOM cost and PCB area in ECU designs.
When designing with the BTT3050EJXUMA1, route the diagnostic pin to a microcontroller ADC or GPIO and respect the recommended PCB copper footprint to keep junction temperature within SOA at maximum ambient. For inductive loads, an external free-wheeling diode is not strictly required but is recommended for repetitive switching of large solenoids.
This page synthesizes distributor pricing, drop-in alternatives from the same HITFET+24V family, and practical PCB/design notes not found in the manufacturer datasheet.
Drop-in alternatives for BTT3050EJXUMA1 — 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 BTT3050EJXUMA1 (same form factor and footprint) — differing in Package, Protection Features, Automotive Qualification, Diagnostic Output, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BTT3028SDLATMA1
✅ Drop-In📋 Reference alternative (not in catalog)
BTS4140NHUMA1
✅ Drop-In✓ In Stock
$0.58 / Unit
View Datasheet →ITS4140NHUMA1
✅ Drop-In✓ In Stock
$0.72 / Unit
View Datasheet →BTS452TATMA1
✅ Drop-In✓ In Stock
$1.12 / Unit
View Datasheet →BTS3134NHUMA1
✅ Drop-In✓ In Stock
$0.78 / Unit
View Datasheet →BTT3050EJXUMA2
✅ Drop-In📋 Reference alternative (not in catalog)
BTT3050EJXUMA1 Maximum Ratings & Electrical Characteristics
| Product Type | Smart Low-Side Power Switch |
| Family | HITFET+24V |
| Number of Channels | 1 |
| Switch Topology | Low-Side |
| Nominal Load Current | 4 A |
| Typical On-Resistance (RDS(on)) | 50 mΩ |
| Operating Voltage Range | 6 V to 36 V |
| Input Type | Active High, Logic Level |
| Diagnostic Output | Yes (open-drain / status pin) |
| Operating Temperature Range (Junction) | -40 °C to +150 °C |
| Package | PG-TDSO-8-31 (exposed-pad SOIC-8) |
| Mounting Type | Surface Mount |
| Automotive Qualification | Yes (AEC-Q100) |
| Protection Features | Overcurrent, Overtemperature, Short-Circuit, Overvoltage, Undervoltage Lockout, Latch |
| ESD Protection | Yes |
| RoHS Status | Compliant |
BTT3050EJXUMA1 Pin Configuration
| Pin 1 | ST — Status / diagnostic output (open drain) |
| Pin 2 | IN — Logic input (active high) |
| Pin 3 | NC — Not connected |
| Pin 4 | GND — Logic ground |
| Pin 5 | VBB — Supply voltage / drain connection |
| Pin 6 | OUT — Load output (source to load, drain of internal MOSFET) |
| Pin 7 | OUT — Load output (source to load, drain of internal MOSFET) |
| Pin 8 | OUT — Load output (source to load, drain of internal MOSFET) |
| Pin 9 | EP — Exposed thermal pad - connect to GND for heatsinking |
Typical Applications
BTT3050EJXUMA1 is suitable for 6 applications: Automotive Solenoid & Valve Drivers, 24 V Industrial Relay & Contactor Replacement, Automotive LED Lighting & Lamp Drivers, Body Electronics & Door Module Loads, HVAC Blower & Fan Motor Control, Power Distribution Smart Fuse Replacement.
Automotive Solenoid & Valve Drivers
The BTT3050EJXUMA1's 4 A continuous rating and 50 mΩ RDS(on) make it well-suited for driving 24 V automotive solenoids such as transmission shift valves, HVAC blend-door actuators, and EGR valves. Operating from 6 V to 36 V with integrated over-current and short-circuit protection, it can sink the inrush current of typical solenoid coils while returning the load to chassis ground in a true low-side topology. The active-high logic input connects directly to a 3.3 V or 5 V ECU GPIO, simplifying firmware. The PG-TDSO-8-31 package's exposed thermal pad dissipates the roughly 0.8 W continuous loss at 4 A into PCB copper, eliminating heatsinks. Internal avalanche clamping absorbs the inductive kickback of de-energizing coils, removing the need for an external flyback diode for most valve and relay loads.
Recommended
24 V Industrial Relay & Contactor Replacement
In industrial 24 V control cabinets the BTT3050EJXUMA1 directly replaces electromechanical relays with a silent, solid-state, software-controllable alternative. The 6 V to 36 V supply range covers both 12 V and 24 V industrial buses, while the 4 A rating handles contactor coils, indicator lamps, and small motor starters. Embedded protection (OVP, UVLO, OCP, OTP) eliminates external fuses, MOVs, and thermal cutouts, reducing panel wiring complexity and BOM cost. The diagnostic pin provides load-open and load-short feedback to a PLC or MCU, enabling predictive maintenance. Switching at low duty cycles incurs negligible self-heating, and the 50 mΩ RDS(on) keeps conduction loss under 1 W even at 4 A, allowing the SO-8 exposed-pad package to operate without a heatsink on standard FR-4 boards.
Recommended
Automotive LED Lighting & Lamp Drivers
The BTT3050EJXUMA1 drives 12 V and 24 V automotive lamps - interior lighting, side markers, license-plate illumination, and indicator lamps - in a low-side configuration. The 4 A rating covers multi-LED strings or single incandescent bulbs (typical 21 W to 48 W loads at 12 V), while the 50 mΩ RDS(on) keeps dissipation under 1 W at full load. Cold-filament inrush currents (10x steady-state for incandescent) are handled by the integrated over-current and short-circuit protection, which latch off safely to protect the wiring harness. The active-high logic input supports PWM dimming via the ECU, and the diagnostic pin returns an open-load signal if a bulb burns out. AEC-Q100 qualification and the -40 °C to +150 °C junction range suit under-hood and cabin-mounted ECU environments.
Recommended
Body Electronics & Door Module Loads
Body control modules use the BTT3050EJXUMA1 to drive door-lock motors, mirror heaters, seat-adjustment relays, and tailgate actuators. The 4 A low-side switch can handle the inrush of small DC gear motors and resistive heating elements while returning the load through the chassis ground. The PG-TDSO-8-31 footprint is small enough for compact door-module PCBs, and the integrated latch-off protection prevents the ECU from resetting during a wiring short. The diagnostic feedback pin reports load-open (broken wire) or load-short conditions back to the BCM, supporting ISO 14229 UDS fault codes. With AEC-Q100 qualification and 6 V to 36 V supply range, the device operates across the full automotive cranking profile down to cold-start voltage transients without dropout.
Recommended
HVAC Blower & Fan Motor Control
Climate-control modules use the BTT3050EJXUMA1 to switch HVAC blower motors in discrete low-side PWM mode for variable fan speed. The 4 A continuous rating covers single-speed and two-speed blower loads (typically 6 A inrush, 2 A steady state), and the 50 mΩ RDS(on) minimizes thermal rise during continuous duty. The active-high logic input accepts a 25 kHz PWM signal from the climate controller for fine-grained airflow control without audible switching noise (above the human hearing range). The exposed thermal pad dissipates the roughly 0.3 W conduction loss at typical operating points, keeping junction temperature well below the 150 °C limit. Embedded short-circuit and over-temperature protection safeguard the module against stalled-motor events, latch-off until the next ignition cycle.
Recommended
Power Distribution Smart Fuse Replacement
In automotive and industrial power distribution units the BTT3050EJXUMA1 replaces blade fuses with a resettable, software-monitorable smart-fuse function. The integrated over-current protection latches off on sustained overcurrent, then resets on MCU command, eliminating the need to physically replace a fuse after a wiring fault. The 6 V to 36 V operating range covers both 12 V and 24 V distribution buses, while the 4 A rating suits medium-current accessory circuits (heated seats, auxiliary lights, infotainment). The diagnostic pin reports trip events to the body controller for ISO 14229 DTC logging, and the PG-TDSO-8-31 footprint is interchangeable with multiple Infineon PROFET/HITFET siblings, allowing designers to scale the load rating (1 A to 6 A) by swapping parts without PCB rework.
Recommended
Recommended Products Summary
Engineering reference data for BTT3050EJXUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTT3028SDLATMA1 | BTS4140NHUMA1 | ITS4140NHUMA1 | BTS3134NHUMA1 | BTT3050EJXUMA2 |
|---|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | PG-TDSO-8-31 (SO-8 EP) | PG-TDSO-8 (SO-8 EP) | PG-TDSO-8 (SO-8 EP) | PG-TDSO-8 (SO-8 EP) | PG-TDSO-8 (SO-8 EP) | PG-TDSO-8-31 |
| Topology | Low-Side | Low-Side | High-Side | High-Side | Low-Side | Low-Side |
| Nominal Load Current | 4 A | 4 A | 1.4 A | 1.4 A | 3 A | 4 A |
| Typical RDS(on) | 50 mΩ | ~65 mΩ | ~150 mΩ | ~150 mΩ | ~80 mΩ | 50 mΩ |
| Operating Voltage Range | 6 V to 36 V | 6 V to 36 V | 6 V to 36 V | 6 V to 36 V | 6 V to 36 V | 6 V to 36 V |
| Automotive Qualified (AEC-Q100) | Yes | Yes | Yes | Yes | Yes | Yes |
| Integrated Protection | OCP, OTP, SCP, OVP, UVLO, Latch | OCP, OTP, SCP, OVP, UVLO | OCP, OTP, OVP, UVLO | OCP, OTP, OVP, UVLO | OCP, OTP, SCP, OVP, UVLO | OCP, OTP, SCP, OVP, UVLO, Latch |
Key Differentiators
- Higher continuous current in same SO-8 EP footprint (vs BTS3134NHUMA1)
- Lower on-resistance in SO-8 EP package (vs BTT3028SDLATMA1)
- True low-side topology with full latch protection (vs BTS4140NHUMA1)
- Fully integrated protection without external components (vs Discrete N-MOSFET + fuse)
Design Notes
Estimated: at 4 A continuous with RDS(on) = 50 mΩ and VBB = 13.5 V, conduction loss is roughly 0.8 W. Solder the exposed thermal pad to at least 1 square inch of 2-oz copper on a 2-layer FR-4 board to keep θJA near 50 K/W; below this footprint the junction may exceed 150 °C in an 85 °C under-hood environment and the OTP will latch off.
Place a 100 nF ceramic bypass capacitor directly at the VBB pin (pin 5) to the exposed pad (ground), within 2 mm of the package. The exposed pad must be soldered to a continuous ground plane (no thermal relief spokes) to achieve the datasheet θJA. Keep the high-current OUT trace (pins 6-8) wide enough to carry 4 A continuously (≥1 mm of 2-oz copper per ampere for 10 °C rise).
Do not use BTT3050EJXUMA1 on the high side of the load - it is a low-side switch and the load returns to ground through the device. Reverse-polarity on VBB will destroy the part; add an external Schottky or P-MOSFET for reverse-battery protection if the harness is exposed to jump-start events. The status (ST) pin is open-drain and requires a pull-up resistor (typically 10 kΩ to Vlogic) for proper logic-level readout.
Route the IN logic trace away from the OUT high-current trace to avoid capacitive coupling that can cause false turn-on during fast dv/dt events on the OUT pin. Star-ground the diagnostic, logic, and power returns at the device's exposed pad. For multi-channel ECUs, place one bypass cap per BTT3050EJXUMA1 device rather than sharing a single bulk cap across channels.
Compliance Information
AEC-Q100 qualified per Infineon HITFET+24V datasheet. RoHS and REACH compliant. Halogen-free per JEDEC JS709B. MSL2 per JEDEC J-STD-020.
