BTS3134NHUMA1 - 42V 3A Smart Low-Side Power Switch | Infineon
MPN: BTS3134NHUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.42 | $1.42 |
| 10 | $1.28 | $12.80 |
| 100 | $1.05 | $105.00 |
| 500 | $0.92 | $460.00 |
| 1,000 | $0.78 | $780.00 |
BTS3134NHUMA1 Overview
A smart low-side power switch is a power distribution switch that controls a load (relay, solenoid, lamp, LED string) by pulling the low side to ground through an internal N-channel MOSFET when activated by a logic-level input. It is functionally and architecturally equivalent to a discrete N-channel MOSFET plus gate driver plus protection circuitry, integrated into a single IC. Smart low-side switches sit within the broader hierarchy of power distribution switches, which in turn belong to the power management IC family.
Key features include an operating supply range up to 42 V, an R_DS(on) of approximately 50 mΩ typical, integrated over-current, over-temperature, over-voltage, and ESD protection, plus a status flag output for fault feedback. The 3 A continuous drain current makes it well-suited to automotive body and chassis loads such as lamps, relays, and small motors. The exposed tab of the PG-SOT223-4 package acts as a thermal pad, allowing the part to dissipate the load current without external heatsinking at moderate duty cycles.
The BTS3134NHUMA1 uses Infineon's SIPMOS technology - a vertical power MOSFET process optimized for low-voltage, high-current switching with integrated CMOS control logic. This monolithic integration eliminates the need for a discrete gate driver and external protection circuitry, reducing PCB area and improving reliability. The AEC-Q100 qualification ensures the part meets automotive stress-test requirements for temperature, humidity, and vibration.
Typical applications include automotive body electronics such as lamp drivers, relay replacement, solenoid and valve control, LED driver circuits, and general 12 V / 24 V automotive load switching. The 42 V maximum rating also provides headroom for 24 V truck and industrial bus systems with load-dump transients.
When designing with this device, ensure that the input pin is driven from a logic-level source (3.3 V or 5 V CMOS) and that the exposed tab is soldered to a sufficient copper pour (typically 1 square inch minimum) to keep junction temperature within the -40°C to +150°C operating range under worst-case load.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer product page alone.
Drop-in alternatives for BTS3134NHUMA1 — 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 BTS3134NHUMA1 (same form factor and footprint) — differing in Package, Diagnostic Output, Operating Temperature Range, Topology, Automotive Qualification.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BTS3118NHUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.62 / Unit
View Datasheet →BTS3125E
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
BTS4140N
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
BTS50085-1TMA
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
BTS3134NHUMA1 Maximum Ratings & Electrical Characteristics
| Manufacturer | Infineon Technologies |
| Product Type | Smart Low-Side Power Switch |
| Topology | 1:1 N-Channel Switch/Driver |
| Maximum Operating Voltage | 42 V |
| Continuous Output Current | 3 A |
| On-State Resistance (R_DS(on)) | 50 mΩ typical |
| Input Logic Level | CMOS / TTL compatible |
| Package | PG-SOT223-4 (4-pin, 3+Tab) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40 °C to +150 °C |
| Automotive Qualification | AEC-Q100 |
| Protection Features | Over-current, Over-temperature, Over-voltage, ESD |
| Status Flag Output | Yes (diagnostic feedback) |
| Technology | SIPMOS (vertical N-channel MOSFET + CMOS logic) |
| RoHS Status | Compliant |
| Packaging | Tape & Reel |
BTS3134NHUMA1 Pin Configuration
| Pin 1 | IN — Logic-level input (drives gate) |
| Pin 2 | GND — Ground reference |
| Pin 3 | VCC / STATUS — Supply voltage and diagnostic status flag |
| Pin 4 | OUT (Tab) — Switched output drain to load (connected to exposed tab) |
Typical Applications
BTS3134NHUMA1 is suitable for 6 applications: Automotive Lamp Driver (12V Headlamp / Indicator), Relay and Solenoid Replacement, 24V Truck and Commercial Vehicle Load Switching, LED Driver and Indicator Strip Switching, Industrial 24V PLC Output Module, Automotive Body Control Module (BCM) Load Driver.
Automotive Lamp Driver (12V Headlamp / Indicator)
The BTS3134NHUMA1 is well-matched to driving automotive 12 V incandescent and LED lamps as a low-side switch. Its 3 A continuous rating comfortably handles a single 21 W turn-signal bulb (~1.75 A) or a high-power LED string with margin, while the 42 V maximum rating absorbs load-dump transients per ISO 7637-2 without external TVS protection. The integrated over-current and over-temperature shutdown protect the bulb and wiring during short-to-ground faults, eliminating the fuse in many designs. The status flag output feeds back to the body control module (BCM) for diagnostic feedback (lamp outage detection) required by modern automotive lighting standards.
Recommended
Relay and Solenoid Replacement
The BTS3134NHUMA1 replaces traditional automotive relays and solenoids in body-electronics applications such as door locks, HVAC flaps, and washer pumps. Drawing less than 5 mA from the logic-level IN pin, it can be driven directly from a microcontroller GPIO, eliminating the relay coil, flyback diode, and suppression hardware. The internal SIPMOS avalanche clamping handles the inductive kickback of the solenoid coil at turn-off, with R_DS(on) of 50 mΩ keeping conduction loss under 0.5 W at 3 A. AEC-Q100 qualification ensures reliable operation across -40 °C to +125 °C ambient automotive temperature ranges.
Recommended
24V Truck and Commercial Vehicle Load Switching
For 24 V truck, bus, and off-highway vehicle electrical systems, the BTS3134NHUMA1 provides robust load-switching capability with 42 V maximum rating delivering 18 V of headroom above the 24 V nominal rail. This covers load-dump pulses per ISO 7637-2 Pulse A and Pulse B without external suppression. The 3 A rating supports typical truck loads such as marker lamps, mirror heaters, and small DC motors in the cab and chassis. The exposed PG-SOT223-4 tab efficiently dissipates the higher conduction losses inherent to 24 V systems, maintaining junction temperature within the AEC-Q100 envelope.
Recommended
LED Driver and Indicator Strip Switching
In LED driver and indicator applications, the BTS3134NHUMA1 functions as a low-side PWM switch for dimming and color-mixing LED strings. The logic-level IN pin accepts a 3.3 V or 5 V PWM signal directly from an MCU, enabling smooth dimming control without additional driver stages. The 50 mΩ R_DS(on) keeps conduction losses low at 1-2 A LED currents, while the integrated over-temperature protection prevents thermal runaway if the LED string shorts. The status flag can alert the host controller to open-circuit LED conditions, useful for safety-critical indicator applications.
Recommended
Industrial 24V PLC Output Module
Industrial PLC digital output modules use the BTS3134NHUMA1 to switch 24 V DC loads such as solenoids, contactors, and indicator lamps from a logic-level backplane signal. Its 42 V rating tolerates the over-voltage transients common on factory 24 V busses, while the 3 A rating covers most discrete industrial outputs without needing a higher-current module. The status flag enables per-channel fault reporting to the PLC CPU, supporting predictive maintenance and reducing field-service callouts. The SIPMOS technology provides a Mean Time Between Failures (MTBF) far exceeding electromechanical relays.
Recommended
Automotive Body Control Module (BCM) Load Driver
Inside an automotive Body Control Module, the BTS3134NHUMA1 serves as the output stage driving miscellaneous loads such as wipers, washer pumps, mirror adjusters, and interior lighting. Its AEC-Q100 qualification is essential for under-hood or cabin-mounted BCMs exposed to wide temperature swings. The small PG-SOT223-4 footprint allows multiple switches to be placed in a compact BCM PCB area, and the integrated protection circuitry reduces the bill of materials versus discrete MOSFET designs. The diagnostic status pin connects directly to the BCM microcontroller for OBD-II compliant fault reporting.
Recommended
Recommended Products Summary
Engineering reference data for BTS3134NHUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTS3118NHUMA1 | BTS3125E | BTS4140N | BTS50085-1TMA |
|---|---|---|---|---|---|
| Package | PG-SOT223-4 | PG-SOT223-4 - same | PG-SOT223-4 - same | PG-SOT223-4 - same | PG-SOT223-4 - same |
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon |
| Switch Type | Low-side | Low-side | Low-side | Low-side | High-side |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes | Yes |
| Technology | SIPMOS | SIPMOS | SIPMOS | SIPMOS | SIPMOS |
Key Differentiators
- Highest current rating in PG-SOT223-4 BTS3xxx family (vs BTS3118NHUMA1)
- Lower R_DS(on) than lower-current BTS siblings (vs BTS3118NHUMA1)
- True low-side topology for load-grounded designs (vs BTS50085-1TMA)
Design Notes
Estimated: At 3 A continuous load with 50 mΩ R_DS(on), conduction loss is approximately 0.45 W at 25 °C junction. With PG-SOT223-4 theta_JA of ~80 °C/W on a 1 sq inch copper pour, junction rise is ~36 °C above ambient. At 150 °C junction limit, ambient maximum is roughly 114 °C - well within AEC-Q100 Grade 1. For continuous 3 A operation above 85 °C ambient, increase PCB copper area to at least 2 sq inches or derate current.
Solder the exposed tab to a copper pour of at least 1 square inch on the top or bottom layer. Use multiple thermal vias (0.3 mm drill, 1 mm pitch) under the tab to conduct heat to internal or opposite-side copper planes. Place input bypass (100 nF) close to the VCC pin and keep the IN trace short to minimize noise coupling into the gate driver. Maintain creepage distance on the OUT pin to adjacent high-voltage traces for 42 V-rated designs.
Do not connect the exposed tab to GND - the tab is internally bonded to the OUT (drain) terminal. Reversing IN and GND will prevent the switch from turning on. Do not exceed 42 V on OUT, even transiently; add a 36 V TVS such as SMBJ36CA on the supply rail for harsh load-dump environments. Do not drive the IN pin below -0.3 V or above VCC + 0.3 V to avoid latch-up of the CMOS input structure.
Compliance Information
AEC-Q100 automotive qualified per Infineon product page. RoHS and REACH compliant. Lead-free and halogen-free per SIPMOS product family datasheet.
