BTS134DATMA1 - 42V 3.5A Smart Low-Side Power Switch | Infineon
MPN: BTS134DATMA1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.42 | $1.42 |
| 10 | $1.27 | $12.70 |
| 100 | $1.08 | $108.00 |
| 500 | $0.92 | $460.00 |
| 1,000 | $0.78 | $780.00 |
| 2,500 | $0.66 | $1,650.00 |
BTS134DATMA1 Overview
A low-side power switch (also called a low-side driver or smart switch) is a discrete or integrated MOSFET placed between the load and ground. It is one of the two fundamental topologies used to drive resistive or inductive loads; the complementary topology is the high-side switch (switch between supply and load). Low-side switches are simpler, cheaper, and have a true ground-referenced source, but they require the load to be tied directly to the battery/rail. Smart low-side switches add on-chip protection (overload, short-circuit, overvoltage, thermal shutdown, ESD), eliminating discrete protection circuitry and reducing PCB area. This places the BTS134DATMA1 inside the broader hierarchy: discrete MOSFET -> protected/MOSFET -> power distribution switch -> power management IC -> semiconductor.
Key features include logic-level input (compatible with 3.3 V and 5 V microcontrollers), embedded ESD protection on the input pin, thermal shutdown with auto-restart, current limitation, overload protection, short-circuit protection, and overvoltage (load-dump) protection. The PG-TO252-3-11 package exposes the drain tab for direct PCB heatsinking, supporting sustained currents up to 3.5 A without an external heatsink. The Green product designation confirms RoHS compliance.
Technically, the BTS134DATMA1 uses a vertical DMOS structure to achieve low on-state resistance (RDS(on)) per unit area, and integrates a charge pump, gate driver, and protection state machine on the same die. Logic-level input thresholds eliminate the need for a gate-driver pre-stage, allowing direct connection to a GPIO. Self-resetting thermal shutdown protects the die at junction temperatures above the shutdown threshold, while current-limit and short-circuit protection safeguard the FET during load faults.
Typical applications include 12 V automotive lamp drivers (incandescent, halogen, LED), solenoid and valve drivers, small DC motor drivers, relay replacement, and general-purpose low-side switching in industrial PLCs and home appliances. The device is AEC-Q100 qualified, making it suitable for harsh underhood and body-electronics environments.
When designing with this part, keep the load return isolated from the MCU ground only if the load itself can tolerate it; otherwise return the load directly to the battery ground. Add sufficient copper area on the drain tab to keep the junction below the thermal-shutdown threshold during inrush events such as cold-lamp filament turn-on or motor start-up.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for BTS134DATMA1 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 BTS134DATMA1 (same form factor and footprint) β differing in Package, Overload Protection, Diagnostic Feedback, ESD Protection (Input Pin), Input Type.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
BTS134D
β Drop-Inπ Reference alternative (not in catalog)
BTS4142NHUMA1
β Drop-Inβ In Stock
$0.97 / Unit
View Datasheet βBTS134DATMA1 Maximum Ratings & Electrical Characteristics
| Manufacturer | Infineon Technologies |
| Product Series | HITFET (BTS134) |
| Switch Type | N-Channel Low-Side Smart Power Switch |
| Technology | Smart SIPMOS (vertical DMOS + protection IC) |
| Input Type | Logic Level |
| Number of Channels | 1 |
| Output Configuration | Low-Side |
| Continuous Drain Current (ID) | 3.5 A |
| Operating Voltage (VLoad) | 42 V (max) |
| Drain-Source Voltage (VDS) | 42 V |
| Input Logic Threshold (VIH/VIL) | Logic-level (3.3 V / 5 V compatible GPIO) |
| ESD Protection (Input Pin) | Yes (embedded) |
| Thermal Shutdown | Yes (auto-restart) |
| Current Limitation | Yes |
| Overload Protection | Yes |
| Short-Circuit Protection | Yes |
| Overvoltage Protection (Load Dump) | Yes |
| Package | PG-TO252-3-11 (DPAK, 2 leads + tab, SC-63) |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 (per Arrow listing) |
| RoHS Status | Compliant (Green product) |
| Packing | Tape & Reel (T&R) |
BTS134DATMA1 Pin Configuration
| Pin 1 | IN β Logic-level input (gate drive, 3.3 V / 5 V compatible) |
| Pin 2 | GND / Source β Source connection (ground reference for the load) |
| Pin 3 | Drain β Drain output to load; electrically and thermally bonded to the tab |
| Pin TAB | Drain β Drain tab (same as pin 3); must be soldered to PCB copper for thermal dissipation |
Typical Applications
BTS134DATMA1 is suitable for 6 applications: 12 V Automotive Lamp Driver, Solenoid and Valve Driver, Small DC Motor Driver (Brushed), Relay Replacement, LED Driver (Low-Side, Constant-Current via External Resistor), Industrial PLC Output Module.
12 V Automotive Lamp Driver
Drives 12 V incandescent, halogen, or LED automotive lamps via low-side switching directly from a body or chassis controller GPIO. The BTS134DATMA1's 3.5 A continuous rating covers most single-filament turn-signal, brake, and reverse-light bulbs, while integrated short-circuit protection guards against the high inrush current of cold filaments. Logic-level input allows direct connection to a 3.3 V or 5 V automotive MCU without a gate-driver pre-stage. AEC-Q100 qualification makes it suitable for underhood and body-electronics modules, and the PG-TO252-3-11 tab enables PCB copper heatsinking to absorb the lamp inrush.
Recommended
Solenoid and Valve Driver
Switches 12 V / 24 V inductive solenoid loads such as transmission shift solenoids, HVAC blend-door actuators, and industrial pneumatic valves. The BTS134DATMA1's overvoltage (load-dump) protection absorbs the inductive flyback spike when the solenoid de-energizes, and current limitation prevents the inrush from exceeding safe SOA. Logic-level input enables direct GPIO control from an MCU or PLC, eliminating the need for an external flyback diode in many cases. The 42 V max load rating gives ample margin for 24 V industrial systems and 12 V automotive load-dump transients.
Recommended
Small DC Motor Driver (Brushed)
Drives small brushed DC motors in body-electronics applications such as window lifters, mirror adjusters, seat positioners, and HVAC blower fans up to 3.5 A continuous. The BTS134DATMA1's logic-level input allows direction/EN control from an automotive MCU GPIO, and embedded thermal shutdown with auto-restart protects the die during motor stall conditions. Current limitation prevents catastrophic failure on rotor lock. Pair with a high-side switch for H-bridge bidirectional control, or use a half-bridge companion like the IFX9201SGAUMA1.
Recommended
Relay Replacement
Replaces electromechanical relays in 12 V / 24 V automotive and industrial systems with a solid-state low-side switch. The BTS134DATMA1 eliminates relay coil current, contact bounce, mechanical wear, and audible click while providing built-in protection (overload, short-circuit, thermal shutdown). Logic-level input allows direct drive from a 3.3 V or 5 V MCU GPIO with no driver circuitry. Common replacements include horn relays, fuel-pump relay stages, and HVAC fan relays in the 1-3 A range.
Recommended
LED Driver (Low-Side, Constant-Current via External Resistor)
Drives a 12 V LED string or LED cluster from the low side when a constant-current resistor or simple linear regulator sets the LED current. The BTS134DATMA1's logic-level input allows PWM dimming directly from an MCU timer, and current limitation protects the LEDs during a wiring fault or short. Integrated thermal shutdown protects the die if the load-dump event causes excess dissipation. Use this topology when the LED anode ties to the battery rail and the cathode returns to the BTS134DATMA1 drain.
Recommended
Industrial PLC Output Module
Used as the low-side output driver in 24 V industrial PLC digital output modules that switch solenoid valves, indicator lamps, and small relays. The BTS134DATMA1's 42 V max load rating and 3.5 A continuous current cover most 24 V industrial loads. AEC-Q100 qualification provides additional robustness margin for harsh industrial environments, and integrated protection simplifies the safety certification of the overall PLC. Logic-level input allows direct drive from an isolated 3.3 V or 5 V logic-side MCU GPIO.
Recommended
Recommended Products Summary
Engineering reference data for BTS134DATMA1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTS134D | BTS4142NHUMA1 | BTS5215LAUMA1 | ITS4100SSJNXUMA1 | BSP742RIXUMA1 |
|---|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | PG-TO252-3-11 (DPAK, 3-pin) | PG-TO252-3-11 (DPAK, 3-pin) - same | PG-TO252-3-11 (DPAK, 3-pin) - same footprint | PG-TO252-5 (DPAK-5) - different pin count | PG-TO252-5 - different pin count | PG-TO252-5 - different pin count |
| Switch Type / Topology | N-Channel Low-Side | N-Channel Low-Side - same | N-Channel High-Side | N-Channel Low-Side (dual channel) | N-Channel Low-Side | N-Channel High-Side |
| Continuous Drain Current | 3.5 A | 3.5 A - same | 1.4 A (typical) | 0.5 A per channel (dual) | 0.8 A typical | 0.4 A typical |
| Load Voltage Rating | 42 V | 42 V - same | 42 V | 42 V | 42 V | 42 V |
| Input Logic Level | Logic-level (3.3 V / 5 V GPIO) | Logic-level - same | Logic-level | Logic-level | Logic-level | Logic-level |
| Integrated Protection | Thermal shutdown + current limit + OVP + ESD + SCP | Same full protection suite | Thermal + current limit + OVP + ESD + SCP | Thermal + current limit + OVP + ESD + SCP | Thermal + current limit + OVP + ESD + SCP | Thermal + current limit + OVP + ESD + SCP |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes | Yes | Yes |
| RoHS / Green Status | RoHS Compliant (Green product) | RoHS Compliant | RoHS Compliant | RoHS Compliant | RoHS Compliant | RoHS Compliant |
Key Differentiators
- Fully protected low-side switch with logic-level input in a single 3-pin DPAK (vs Discrete N-channel MOSFET (e.g., IRFR3411TRPBF))
- AEC-Q100 qualified with 3.5 A continuous rating for direct 12 V automotive load driving (vs Generic logic-level MOSFET without AEC-Q100)
- Vertical SIPMOS technology in PG-TO252-3-11 with exposed drain tab for PCB heatsinking (vs BTS4142NHUMA1 (high-side variant))
Design Notes
Estimated: at ID=3.5 A continuous and RDS(on) on the order of 50 mOhm (a typical HITFET BTS134 family value), conduction loss is approximately 0.6 W, well within the PG-TO252-3-11 package rating when the drain tab is soldered to at least 1 square inch (6 cm^2) of 2-oz copper. During cold-lamp inrush or motor stall, transient dissipation can exceed 5 W and the device relies on thermal shutdown with auto-restart to protect itself. Always provide maximum copper area on the drain tab and use thermal vias to inner copper planes to spread heat.
Route the input trace (pin 1) directly from the MCU GPIO with minimal length and keep it away from the drain tab (pin 3 / tab) to avoid capacitive coupling that can cause false triggering during high dV/dt load events. Place a 100 nF ceramic decoupling capacitor close to the MCU GPIO side of the input trace if the MCU is more than 25 mm away. The drain tab must be soldered to a copper pad of at least 100 mm^2 with thermal vias to inner planes.
Do not use the BTS134DATMA1 as a high-side switch - the source pin must remain at ground potential for the internal gate drive to function correctly. If the load must be switched on the high side, use the BTS4142NHUMA1 or BSP742RIXUMA1 instead. Also avoid daisy-chaining the drain to another switch or to a voltage source greater than 42 V; the overvoltage protection will trigger and the part will enter repetitive shutdown cycles. For inductive loads, the integrated overvoltage protection typically eliminates the need for an external flyback diode, but verify with the datasheet SOA curve for your specific load inductance and PWM frequency.
Compliance Information
RoHS compliant (Green product per Infineon datasheet). AEC-Q100 qualified (per Arrow catalog entry). REACH and conflict-minerals compliance per Infineon product statements; halogen-free status not specifically confirmed in distributor data.
