BTS3256DAUMA1 - 7.5A Smart Low-Side Switch | Infineon HITFET
MPN: BTS3256DAUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.69 | $3.69 |
| 10 | $3.32 | $33.20 |
| 100 | $2.95 | $295.00 |
| 500 | $2.62 | $1,310.00 |
| 1,000 | $2.43 | $2,430.00 |
BTS3256DAUMA1 Overview
A smart low-side power switch is an integrated circuit that replaces a discrete MOSFET plus discrete protection circuitry by combining the power transistor, gate driver, current sensing, and protection logic in a single package. It sits in the power distribution hierarchy between a microcontroller's GPIO and a ground-referenced load such as a relay coil, solenoid valve, lamp filament, or heating element. By switching on the low side, the load is grounded to complete the circuit when the FET turns on, allowing the load to operate from a positive supply rail. Smart low-side switches reduce PCB area, improve reliability, and provide built-in diagnostic and protective features that discrete implementations cannot match.
Key features of the BTS3256DAUMA1 include a typical on-state resistance of approximately 50 mOhm, a continuous drain current of 7.5 A, and an operating voltage range suited to 12 V automotive systems. The integrated clamp circuit handles inductive load turn-off safely, while the thermal protection shuts the channel down when junction temperature exceeds safe limits. The status output allows the ECU to distinguish between normal operation, short-to-ground, short-to-battery, and open-load conditions, supporting ISO 26262 functional safety requirements.
The BTS3256DAUMA1 uses Infineon's proprietary HITFET technology, which combines a low-RDS(on) vertical DMOS output stage with CMOS control logic. This architecture achieves very low quiescent current in standby while delivering high peak current capability for inrush loads such as cold filament lamps or capacitive loads. The 5-pin DPAK package provides an exposed thermal pad for low thermal resistance, allowing sustained high current operation without external heatsinking in typical automotive environments.
Typical applications include automotive body electronics, solenoid and valve drivers, LED lighting modules, power distribution switches, HVAC flap motors, and small DC motor control. The device is also widely used in 24 V truck and commercial vehicle systems where its voltage rating provides additional margin.
When designing with the BTS3256DAUMA1, place a 100 nF ceramic decoupling capacitor close to the Vbb supply pin and ensure the exposed pad has sufficient copper pour (at least 1 square centimeter) for thermal dissipation. The status pin requires a pull-up resistor and should be monitored by the MCU for fault handling. Always respect the maximum junction temperature of 150 C and derate current accordingly at elevated ambient temperatures.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with all figures referenced as of 2026-09-15.
Drop-in alternatives for BTS3256DAUMA1 — 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 BTS3256DAUMA1 (same form factor and footprint) — differing in Operating Voltage Range, Output Configuration, Package, Number of Channels, Product Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BTS5016SDAAUMA1
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BTF500601TEAAUMA1
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BTS70402EPGXUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.18 / Unit
View Datasheet →BTH60801EPLXUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.74 / Unit
View Datasheet →VN750PS
✅ Drop-In📋 Reference alternative (not in catalog)
ISP752TFUMA1
✅ Drop-In✓ In Stock
$1.02 / Unit
View Datasheet →BTS3256DAUMA1 Maximum Ratings & Electrical Characteristics
| Product Type | Smart Low-Side Power Switch |
| Technology | HITFET (N-channel vertical DMOS) |
| Number of Channels | 1 |
| Output Configuration | Low-Side, 1:1 |
| Continuous Drain Current | 7.5 A |
| Operating Voltage Range | 4.5 V to 28 V (load supply Vbb) |
| On-State Resistance (RDS(on)) | 50 mOhm typical |
| Overvoltage Clamp | Integrated |
| Thermal Shutdown | Yes (with auto-restart) |
| Current Limitation | Yes (integrated) |
| Status Feedback | Yes (open-drain status pin) |
| ESD Protection | Yes (per datasheet) |
| Operating Temperature (Junction) | -40 C to +150 C |
| Package | PG-TO252-5-11 (DPAK-5) |
| Mounting Type | Surface Mount |
| Automotive Qualified | Yes (AEC-Q100) |
| RoHS Compliance | Compliant |
BTS3256DAUMA1 Pin Configuration
| Pin 1 | OUT — Drain output to load (N-channel drain) |
| Pin 2 | GND — Ground reference for logic and protection |
| Pin 3 | IN — Logic input gate drive (3V/5V compatible) |
| Pin 4 | Vbb — Load supply voltage (4.5V to 28V) |
| Pin 5 | ST — Status feedback (open-drain diagnostic output) |
| Pin TAB | DRAIN — Exposed tab - internally connected to drain (OUT) |
Safe Operating Area (estimated from PG-TO252-5-11 package and 7.5A rating)
Typical Applications
BTS3256DAUMA1 is suitable for 7 applications: Automotive Body Control Module, Solenoid and Valve Driver, Automotive LED Lighting Module, HVAC Flap Motor Control, Power Distribution Switch, 24V Commercial Vehicle Load Switch, Industrial Relay Replacement.
Automotive Body Control Module
The BTS3256DAUMA1 is well suited for driving loads inside an automotive body control module (BCM), where each channel typically handles lamps, locks, or small motors from a 12 V supply. The 7.5 A continuous current rating covers headlight bulbs, door lock solenoids, and turn-signal loads. The integrated thermal shutdown and overcurrent limit protect the ECU board from wiring harness faults. The status feedback pin enables the BCM microcontroller to distinguish between lamp failure, short-circuit, and open-load conditions, which is required for end-of-line diagnostics and bulb-out detection in modern vehicles. Compared to discrete MOSFET solutions, the BTS3256DAUMA1 saves PCB area and reduces the bill of materials by integrating protection and diagnostics in one PG-TO252-5-11 package.
Recommended
Solenoid and Valve Driver
The BTS3256DAUMA1 drives small-to-medium inductive loads such as solenoid valves, hydraulic valves, and pneumatic actuators in industrial and automotive systems. The integrated inductive load clamp safely absorbs the flyback energy when the solenoid is de-energized, eliminating the need for an external freewheeling diode. With 7.5 A continuous current capability, the device can handle solenoid inrush currents up to several amps steady-state. The current-limit feature protects the wiring and connector from downstream short circuits, and the status pin reports fault conditions to the host controller for predictive maintenance. Using the BTS3256DAUMA1 as a low-side solenoid driver reduces PCB footprint by approximately 60% compared to discrete MOSFET-plus-diode designs.
Recommended
Automotive LED Lighting Module
The BTS3256DAUMA1 functions as a low-side LED driver in automotive exterior and interior lighting modules, including tail lamps, turn indicators, and daytime running lights. The status pin provides open-load detection when an LED fails, which is essential for automotive lighting safety compliance. The 4.5 V to 28 V operating range covers cold-crank and load-dump transients on the vehicle 12 V or 24 V bus. By PWM-ing the IN pin, the device can dim the LED string at frequencies above 100 Hz, exceeding the human flicker perception threshold. The integrated thermal shutdown protects the LEDs and driver from overheating in enclosed lamp housings, eliminating the need for a discrete temperature sensor.
Recommended
HVAC Flap Motor Control
The BTS3256DAUMA1 drives the small DC brush motors used in HVAC air distribution flap actuators, where reliability and silent operation are critical. The 7.5 A continuous rating handles the inrush current of small DC motors during stall conditions, while the current-limit feature prevents damage if the flap mechanism jams. The thermal shutdown protects the actuator electronics in high-temperature engine bay or roof console installations. Because HVAC flap motors operate infrequently, the very low standby quiescent current of the BTS3256DAUMA1 minimizes parasitic battery drain when the vehicle is parked, which is important for preserving battery life over long storage periods.
Recommended
Power Distribution Switch
The BTS3256DAUMA1 acts as an electronic power distribution switch, replacing an electromechanical relay with a solid-state device that supports PWM control and diagnostic feedback. The device handles 7.5 A continuous current suitable for downstream subsystems such as seat heaters, mirror heaters, or auxiliary lighting. The status output reports downstream wiring faults back to the ECU, enabling the body controller to take protective action. The PG-TO252-5-11 package provides a low thermal resistance of approximately 40 C/W when soldered to a 1 square inch copper pour, which is sufficient for sustained operation at 7.5 A in typical ambient conditions.
Recommended
24V Commercial Vehicle Load Switch
The BTS3256DAUMA1 is rated for 24 V truck, bus, and commercial vehicle electrical systems where the nominal bus voltage is 24 V and transients can reach 36 V during load dump. The integrated overvoltage clamp protects the output stage from these transients, and the 7.5 A continuous current handles typical commercial vehicle loads such as marker lamps, small solenoids, and signaling devices. The AEC-Q100 qualification ensures reliability across the wider temperature range experienced in heavy-duty vehicle applications. The status pin enables fleet diagnostic systems to identify and isolate faulty channels, reducing warranty and service costs.
Recommended
Industrial Relay Replacement
The BTS3256DAUMA1 replaces electromechanical relays in industrial control systems where silent operation, long life, and diagnostic feedback are required. The solid-state design eliminates mechanical wear, contact bounce, and the audible click of conventional relays, which is advantageous in noise-sensitive environments such as medical or laboratory equipment. The 7.5 A continuous current handles most small industrial loads including indicator lamps, small heaters, and solenoid valves. The integrated status feedback allows the PLC to detect failed outputs without external current sensors, simplifying wiring and reducing installation cost. The device's wide operating temperature range of -40 C to +150 C junction supports outdoor and industrial cabinet installations.
Recommended
Recommended Products Summary
Engineering reference data for BTS3256DAUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTS5016SDAAUMA1 | BTF500601TEAAUMA1 | BTH60801EPLXUMA1 | VN750PS | ISP752TFUMA1 |
|---|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | STMicroelectronics | Infineon |
| Package | PG-TO252-5-11 | PG-TO252-5-11 - same | PG-TO252-5-11 - same | PG-TO252-5-11 - same | P-TO252-5 - same footprint | PG-TO252-5-11 - same |
| Continuous Drain Current | 7.5 A | 16 A | 9 A | 8 A | 6 A | 1.3 A |
| On-State Resistance (typ) | 50 mOhm | 20 mOhm | 35 mOhm | 40 mOhm | 60 mOhm | 200 mOhm |
| Operating Voltage Range | 4.5 V to 28 V | 4.5 V to 28 V | 4.5 V to 28 V | 4.5 V to 28 V | 5.5 V to 36 V | 4.5 V to 28 V |
| Topology | Low-Side | Low-Side | Low-Side | Low-Side | High-Side | High-Side |
| Status/Diagnostic Output | Yes (open-drain) | Yes | Yes | Yes | Yes | Yes |
| Automotive Qualified (AEC-Q100) | Yes | Yes | Yes | Yes | Yes | Yes |
| Unit Price (qty 1000) | $2.43 | $3.10 | $2.80 | $2.90 | $2.20 | $1.50 |
Key Differentiators
- Higher continuous current in same footprint (vs VN750PS)
- Lower RDS(on) than lower-current alternatives (vs ISP752TFUMA1)
- Lower cost than higher-current siblings (vs BTS5016SDAAUMA1)
- Full diagnostic feedback set (vs Discrete MOSFET design)
Design Notes
Estimated: At Vbb=14V with 7.5A continuous load and 50 mOhm RDS(on), the BTS3256DAUMA1 dissipates approximately 14V x 7.5A = 105W total system power at the load, with the switch dissipating 0.05 x 7.5^2 = 2.8W. With the PG-TO252-5-11 thermal resistance of approximately 40 C/W on a 1 sq inch copper pour, the junction temperature rise is about 112 C above ambient. Derate current linearly with ambient temperature, keeping Tj below 150 C. Increase copper pour to 2 sq inches for high-temperature underhood installations.
Solder the exposed tab to a copper pour of at least 1 square centimeter on the top or bottom layer, with thermal vias to the opposite plane for improved heat spreading. Place a 100 nF ceramic decoupling capacitor (X7R) as close as possible to the Vbb pin (pin 4) to suppress supply transients. The IN pin (pin 3) accepts 3.3V or 5V logic directly, but adding a 1 kohm series resistor limits inrush current and reduces EMI on long MCU traces.
Do not exceed the absolute maximum Vbb rating. The integrated overvoltage clamp handles load-dump transients up to the datasheet limit, but external TVS protection is recommended on the Vbb rail for severe transients above the device rating. The status pin is open-drain and requires an external pull-up resistor (typically 10 kohm to 5V); do not leave it floating or the diagnostic feature will not function. The OUT pin is the drain and must be connected directly to the load; do not place a series inductor or resistor in the drain path.
Route the high-current OUT trace as a wide polygon (at least 0.5 mm per ampere, so 4 mm for 7.5 A) to minimize voltage drop and copper heating. Keep the GND return path short and direct to the tab ground via a wide polygon. Avoid routing digital signal traces (IN, ST) directly under the OUT power polygon to prevent capacitive coupling and logic glitches. The ST trace should be short and shielded by adjacent ground to maintain signal integrity in noisy automotive environments.
Compliance Information
AEC-Q100 automotive qualified per Infineon product page. RoHS and REACH compliant. Lead-free and halogen-free per package marking.
