BTS3028SDRATMA1 - 5A Smart Low-Side Switch, 28mΩ | Infineon
MPN: BTS3028SDRATMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.34 | $134.00 |
| 500 | $1.08 | $540.00 |
| 1,000 | $0.92 | $920.00 |
Drop-in alternatives for BTS3028SDRATMA1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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BTS3028SDRATMA1 Maximum Ratings & Electrical Characteristics
| Product Type | Smart Low-Side Power Switch |
| Topology | 1:1 N-Channel, single channel |
| Output Current (max) | 5 A |
| On-Resistance RDS(ON) | 28 mΩ (typ.) |
| Load Voltage (max) | 60 V (load-dump rated) |
| Operating Supply Voltage | 5 V to 28 V (typ. 13.5 V) |
| Logic Input Voltage (IN) | Logic-level, 3.3 V/5 V compatible |
| Package | PG-TO252-3-11 (DPAK, 3 pins = 2 leads + tab) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 °C to +150 °C (junction) |
| Protection Features | Overtemperature shutdown, overvoltage clamp, ESD, short-circuit current limit, reverse battery, ground loss |
| Status Output | Open-drain diagnostic flag |
| Automotive Qualification | AEC-Q100 |
| RoHS Status | Compliant |
BTS3028SDRATMA1 Pin Configuration
| Pin 1 | IN — Logic-level input (3.3V/5V compatible); drives gate via internal charge pump |
| Pin 2 | GND — Ground / source of internal N-channel power FET |
| Pin 3 | OUT / Tab — Output (drain of internal N-channel MOSFET); exposed tab is the drain terminal and provides thermal dissipation path |
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
BTS3028SDRATMA1 is suitable for 7 applications: Automotive LED Lighting Load, Automotive Body Electronics (Door, Seat, Mirror), Relay and Solenoid Replacement, Industrial 24V Load Switching, Power Distribution and Protection Modules, HVAC and Climate Control Loads, Battery Management and Auxiliary Outputs.
Automotive LED Lighting Load
The BTS3028SDRATMA1 is a strong fit for driving 12V automotive LED strings (DRL, tail, indicator, interior lighting) thanks to its 28 mΩ RDS(ON) at 5 A and PWM-able logic-level IN input. Placed between the LED string and ground, it accepts 3.3 V or 5 V GPIO control directly from a body-control MCU without an external gate driver, and its open-drain status pin reports open-load and short-to-ground faults back to the BCM. Unlike a discrete N-MOSFET + fuse + TVS solution, the integrated protections shrink BOM and improve diagnostic coverage in compliance with automotive lighting standards.
Recommended
Automotive Body Electronics (Door, Seat, Mirror)
Body-control modules for door locks, mirror heaters, seat-adjustment motors, and window lifters benefit from the BTS3028SDRATMA1's AEC-Q100 qualification and integrated protections. Driving inductive loads such as solenoids and small DC motors directly is safe within the part's 5 A continuous rating and reverse-battery / ground-loss tolerant shutdown sequence. Compared to a relay, the BTS3028SDR provides silent PWM operation, longer life, and built-in fault diagnostics - critical for end-of-line testing and OEM warranty reduction.
Recommended
Relay and Solenoid Replacement
Replacing automotive relays and solenoids with the BTS3028SDRATMA1 eliminates mechanical wear, contact bounce, and audible click noise while adding diagnostic feedback. With a 28 mΩ typ. RDS(ON) and 5 A continuous capability, the part covers most 12V/24V relay-driven loads at less than 1 W conduction loss. The integrated over-temperature shutdown auto-restarts the channel after a fault clears, and the open-drain status flag can replace the auxiliary contact normally used for relay monitoring.
Recommended
Industrial 24V Load Switching
Beyond automotive, the BTS3028SDRATMA1's 28 V supply rating and 60 V load tolerance suit industrial 24V PLC and process-control loads such as solenoid valves, indicator lamps, and small heater elements. The logic-level IN input interfaces directly with industrial MCU or PLC digital outputs, while the embedded protection set (overtemperature, overvoltage, ESD, short-circuit limit, reverse-battery) handles the harsh factory-floor electrical environment. Compared to electromechanical relays or photoMOS solutions, it provides silent, software-controllable switching with diagnostic feedback.
Recommended
Power Distribution and Protection Modules
Distributed power modules in automotive ECUs and industrial control cabinets use the BTS3028SDRATMA1 as a per-channel protected switch, replacing discrete fuses and MOSFETs with a single AEC-Q100 qualified IC. Each channel provides controlled inrush, fault isolation, and diagnostic feedback to the host MCU via the open-drain status output. Compared to PPTC self-resetting fuses, the BTS3028SDR reacts faster to short circuits, dissipates less steady-state power, and provides deterministic restart only after the fault clears.
Recommended
HVAC and Climate Control Loads
Climate-control subsystems including blower-motor relays, valve actuators, and PTC heater stages benefit from the BTS3028SDRATMA1's quiet PWM operation and integrated fault handling. Driving 12V brush motors with PWM via the IN pin gives smooth speed control without relay contact wear, while the status flag supports end-of-line diagnostics for HVAC assembly. The AEC-Q100 grade ensures compliance with automotive temperature and reliability requirements for under-hood and cabin modules.
Recommended
Battery Management and Auxiliary Outputs
In auxiliary battery management and 12V accessory outputs (cigar lighter, USB charging ports, auxiliary lighting), the BTS3028SDRATMA1 serves as a software-controlled smart fuse with full diagnostic feedback. It handles inrush from capacitive loads with controlled turn-on, isolates faults via integrated current limit, and reports open-load or short-circuit events to the BCM. Compared to a polyfuse + discrete MOSFET, the BTS3028SDR reduces board area, eliminates manual fuse replacement, and provides deterministic recovery behavior.
Recommended
Recommended Products Summary
Engineering reference data for BTS3028SDRATMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTS3035TFATMA1 | BTS3050TFATMA1 | BTS3050EJXUMA1 | BTS3125TFATMA1 | VN5E160STR-E |
|---|---|---|---|---|---|---|
| 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 | DPAK (TO-252) - same |
| Brand | Infineon | Infineon (same-brand) | Infineon (same-brand) | Infineon (same-brand) | Infineon (same-brand) | STMicroelectronics (cross-brand) |
| Output Current (max) | 5 A | 5 A class | 5 A class | 5 A class | lower current class | 5 A class |
| RDS(ON) typ. | 28 mΩ | higher than 28 mΩ (within HITFET family) | ~50 mΩ class | ~50 mΩ class | higher RDS(ON) | comparable low-mΩ class |
| Load Voltage Rating | 60 V (load-dump) | 60 V class | 60 V class | 60 V class | 60 V class | 41 V class (verify) |
| Automotive Qualification | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 |
| Status Output | Open-drain diagnostic flag | Open-drain | Open-drain | Open-drain | Open-drain | Open-drain (verify pin) |
| RoHS / Pb-free | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Key Differentiators
- Lower RDS(ON) than most HITFET siblings in the same DPAK footprint (vs BTS3050TFATMA1)
- Infineon HITFET Smart Low-Side architecture with full diagnostic status flag (vs VN5E160STR-E (STMicroelectronics))
- Full 60 V load-dump rating for automotive 12V systems (vs BTS3125TFATMA1)
Design Notes
Estimated: at 3 A continuous load and 28 mΩ typ. RDS(ON), conduction loss is roughly P = I² × R = (3 A)² × 28 mΩ ≈ 0.252 W, doubling to ~0.5 W at 150 °C junction. Solder the DPAK tab to at least 1 cm² of 1 oz copper to keep the junction within the 150 °C rating; use thermal vias to an inner copper pour for additional margin in enclosed automotive modules. Always validate junction temperature under worst-case VIN, IOUT, and ambient.
Keep the high-current OUT/tab trace short and wide to minimize parasitic inductance when driving inductive loads. Place a TVS or freewheel diode across inductive loads (relays, solenoids, motors) even though the BTS3028SDR integrates clamping - the integrated clamp is sized for fault events, not continuous flyback energy. A 100 nF ceramic decoupling cap on the supply near the IC helps suppress ESD-induced transients.
Do not exceed 28 V on Vbb supply or 60 V load-dump on the OUT pin. The status pin requires an external pull-up resistor (typically 10 kΩ to Vlogic) - leaving it floating yields undefined logic levels. Reverse-battery protection works only when the IC is wired with correct polarity; reversed supply will defeat the protection and may damage the device. Always debounce or filter the IN pin if it is wired to a long harness or mechanical switch to prevent false retriggering.
Use a star-ground layout that ties the BTS3028SDR source pin and the MCU ground together at a single point to prevent ground-shift noise from coupling into the IN pin. Route the IN trace away from the OUT/tab high-current path; keep the status trace short and shielded if routed near noisy harnesses. For PWM dimming of LEDs, place a small RC (1 kΩ + 1 nF) near the IN pin to slow the gate transition and reduce EMI.
Compliance Information
AEC-Q100 qualified per Infineon product page. RoHS and Pb-free confirmed. Halogen-free consistent with Infineon automotive-grade SMD packaging policy.
