BTS118DATMA1 - 42V 2.4A Smart Low-Side Switch | Infineon
MPN: BTS118DATMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.28 | $128.00 |
| 500 | $1.05 | $525.00 |
| 1,000 | $0.92 | $920.00 |
| 2,500 | $0.78 | $1,950.00 |
Drop-in alternatives for BTS118DATMA1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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View Datasheet →BTS118DATMA1 Maximum Ratings & Electrical Characteristics
| Part Number | BTS118DATMA1 |
| Manufacturer | Infineon Technologies |
| Product Family | Smart SIPMOS Low-Side Power Switch |
| Topology | 1:1 N-Channel Smart Low-Side Switch |
| Load Supply Voltage (Vbb max) | 42 V |
| Continuous Drain Current | 2.4 A |
| Input Logic Level | CMOS / TTL compatible |
| Input Protection | ESD protected |
| Thermal Protection | Thermal shutdown with auto-restart |
| Overload Protection | Yes |
| Short-Circuit Protection | Yes |
| Overvoltage Protection | Yes (Vbb transient) |
| Current Limitation | Yes |
| Status Feedback | Open-drain diagnostic output (shared with IN) |
| Package | PG-TO252-3-11 (DPAK) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40C to +150C (junction) |
| RoHS / REACH | Green product, RoHS compliant, lead-free |
| MSL Level | MSL 3 (per JEDEC J-STD-020) |
BTS118DATMA1 Pin Configuration
| Pin 1 | IN / STATUS — Logic-level CMOS input (drive high to turn on); shared with open-drain diagnostic status output (pulled low on fault) |
| Pin 2 | LOAD — Drain of the N-channel power MOSFET; connect to the low-side of the load |
| Pin 3 | GND / TAB — Source of the N-channel power MOSFET and thermal tab; connect to system ground |
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
BTS118DATMA1 is suitable for 6 applications: Automotive Body Electronics, 24V Industrial Solenoid and Valve Drivers, PLC Digital Output Modules, Automotive LED Lighting Modules, Relay Replacement in Automotive and Industrial Systems, Heater and Resistive Load Switches.
Automotive Body Electronics
The BTS118DATMA1 is a natural fit for automotive body-control modules that switch 12V loads such as door lock actuators, mirror heaters, seat heaters and interior lamps. Its 42V Vbb rating absorbs 24V jump-start transients without external suppression, and the embedded ESD, overload and short-circuit protections let it survive the harsh automotive electrical environment directly at the load connector. Designers wire the BTS118D between the load and chassis ground, then drive its logic-level IN pin from the BCM microcontroller GPIO - no gate resistor, no freewheeling diode, and no separate current-sense amplifier are required, which reduces the BOM and PCB area compared with a discrete MOSFET solution.
Recommended
24V Industrial Solenoid and Valve Drivers
In 24V industrial automation, the BTS118DATMA1 directly switches solenoid coils, pneumatic valves and small hydraulic actuators from a PLC digital output or microcontroller GPIO. The 42V Vbb ceiling tolerates inductive flyback spikes when combined with the BTS118D's internal active zener clamp, and the auto-restart thermal shutdown prevents catastrophic failure if a valve coil is mechanically jammed and draws sustained overcurrent. Compared with a discrete N-MOSFET + flyback diode, the BTS118D halves the component count, eliminates the need for thermal foldback design, and provides built-in diagnostic feedback through the IN/STATUS pin for predictive maintenance.
Recommended
PLC Digital Output Modules
Programmable logic controllers use the BTS118DATMA1 as the per-channel low-side switch in 24V digital output modules, where each channel must drive an inductive load, survive wiring faults, and report a fault back to the PLC CPU. The part's current limit and short-circuit protection let one channel fail safely without taking down the entire module, while the open-drain STATUS pin returns a feedback signal to the PLC's input multiplexer for wire-break and overload diagnostics. The DPAK footprint also keeps the channel density high - up to 16 channels fit on a typical 100mm PLC output board.
Recommended
Automotive LED Lighting Modules
The BTS118DATMA1 drives 12V LED strings for daytime running lights, interior ambient lighting and rear lamp clusters with constant-current-style behaviour thanks to its built-in current limit. Combined with PWM from the BCM, the part provides dimming control without external driver ICs, and its 42V Vbb headroom tolerates load-dump transients that would otherwise destroy discrete MOSFETs. The DPAK package dissipates the LED driver's heat directly into the module's aluminium heatsink or copper pour, keeping the LED junction temperature within spec.
Recommended
Relay Replacement in Automotive and Industrial Systems
Replacing electro-mechanical relays with the BTS118DATMA1 eliminates relay coil current draw, contact bounce, mechanical wear and audible click noise in automotive and industrial systems. The semiconductor switch is silent, has unlimited cycles, draws only microamps from the logic input, and integrates diagnostics that a relay cannot provide. For 12V/24V systems switching sub-2.4A resistive or inductive loads, the BTS118D is a drop-in semiconductor relay replacement that improves long-term reliability and enables software-controlled load shedding.
Recommended
Heater and Resistive Load Switches
The BTS118DATMA1 switches resistive heating elements such as mirror heaters, seat heaters, fuel pre-heaters and small industrial heating pads from a 12V or 24V supply. Its continuous 2.4A rating matches the typical 30W heater load, and the auto-restart thermal shutdown protects the device if the heater element is shorted or the airflow is blocked. Compared with a relay, the BTS118D supports PWM-based proportional heating control and provides fault feedback, enabling the host ECU to detect a stuck-open or stuck-short heater in real time.
Recommended
Recommended Products Summary
Engineering reference data for BTS118DATMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTS3035TFATMA1 | BTS134DATMA1 | BSP762TXUMA1 | BTS52001ENAXUMA1 |
|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | PG-TO252-3-11 (DPAK) | PG-TO252-3-11 (DPAK) - same | PG-TO252-3-11 (DPAK) - same | PG-TO252-3-11 (DPAK) - same | PG-TO252-3-11 (DPAK) - same |
| Topology | Smart Low-Side N-Channel | Smart Low-Side N-Channel | Smart Low-Side N-Channel | Smart Low-Side N-Channel | Smart High-Side PROFET |
| Maximum Vbb | 42 V | 50 V | 60 V | 42 V | 40 V |
| Continuous Drain Current | 2.4 A | 3 A | 4 A | 1 A | 0.6 A |
| On-State Resistance RDS(on) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Input Logic Level | CMOS / TTL compatible | CMOS / TTL compatible | CMOS / TTL compatible | CMOS / TTL compatible | CMOS / TTL compatible |
| Thermal Shutdown | Yes (auto-restart) | Yes (auto-restart) | Yes (auto-restart) | Yes (auto-restart) | Yes (auto-restart) |
| Status Feedback | Yes (open-drain, shared with IN) | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) | Yes (SPI/diagnostic) |
| Approx. 1k Price (USD) | $0.92 | $0.98 | $1.15 | $0.85 | $1.05 |
Key Differentiators
- Higher Vbb rating than BSP762T (42V vs 42V) with 2.4x the continuous current (vs BSP762TXUMA1)
- Single-channel simplicity vs multi-channel PROFETs (vs BTS50301EJAXUMA1)
- Low-side topology complements PROFET high-side portfolio (vs BTS52001ENAXUMA1)
Design Notes
Estimated: at 24V Vbb, a fully-on resistive load drawing 2A and a typical RDS(on) of 200 mOhm produces 0.8W dissipation in the DPAK package. With a 1 square inch of 2 oz copper pad the DPAK achieves theta_JA around 35 C/W, giving a 28C temperature rise - acceptable below 85C ambient. For continuous 2.4A loads at 24V, increase the copper area to 2 square inches or attach an external SMT heatsink to keep the junction below 150C. Designers should always cross-check against the actual RDS(on) figure from the Infineon datasheet once it is published.
The PG-TO252-3-11 (DPAK) tab is the source connection - it MUST be soldered to a substantial copper pour that serves both as thermal dissipation and as the high-current return path for the load. Route the load return directly to the tab with the shortest possible trace, and use vias to a bottom-side copper flood to spread heat. Place input pull-up/down and IN/STATUS decoupling components within 5mm of the IN pin to keep the digital ground return short and avoid ground bounce that could falsely trigger the diagnostic comparator.
Do NOT use the BTS118DATMA1 to switch the high side of the load - it is a low-side switch and reversing the topology will back-feed the load during the off state. Add an external reverse-battery protection element (a smart high-side PROFET or a Schottky diode) at the supply rail because the BTS118D does not block reverse current. For PWM dimming above 1 kHz, verify the part's input slew rate and STATUS pin capacitance against the microcontroller's drive strength to keep rise/fall times below the EMC specification.
Keep the high-current load traces and the input/STATUS signal traces on opposite sides of the package, separated by the source tab, to minimise dv/dt coupling into the logic pin. Place a 100 nF ceramic decoupling capacitor close to the IN pin if the input trace is longer than 25 mm, especially in noisy automotive environments. When using the STATUS feedback, route it as a separate trace to the host microcontroller rather than tying it back into the same net as IN - the part's input and STATUS functions share a pin but require external isolation via a resistor.
Compliance Information
Infineon Green Product per datasheet; AEC-Q100 qualified for automotive body-electronics applications; lead-free and halogen-free plating per JEDEC J-STD-020 MSL 3.
