BTS3405GXUMA1 - Dual N-Ch 350mA Low-Side Switch | Infineon
MPN: BTS3405GXUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.18 | $1.18 |
| 10 | $1.06 | $10.60 |
| 100 | $0.92 | $92.00 |
| 500 | $0.78 | $390.00 |
| 1,000 | $0.66 | $660.00 |
| 2,500 | $0.55 | $1,375.00 |
Drop-in alternatives for BTS3405GXUMA1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BTS3405G
✅ Drop-In📋 Reference alternative (not in catalog)
BTS3408G
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
BTS3110NHUMA1
✅ Drop-In✓ In Stock
$0.82 / Unit
View Datasheet →BTS4141NHUMA1
✅ Drop-In✓ In Stock
$1.02 / Unit
View Datasheet →BTS724GXUMA1
✅ Drop-In✓ In Stock
$3.21 / Unit
View Datasheet →BTS3405GXUMA1 Maximum Ratings & Electrical Characteristics
| Manufacturer | Infineon Technologies |
| Part Family | HITFET (Classic) |
| Function | Dual-channel low-side power switch |
| Number of Channels | 2 (independent) |
| Switch Type | N-Channel MOSFET (low-side) |
| Continuous Output Current | 350 mA per channel |
| On-State Resistance (Rds_on) | 0.9 Ω (max) |
| Maximum Drain Voltage | 42 V |
| Input Logic Compatibility | CMOS/TTL logic-level |
| Operating Temperature Range | -40 °C to +150 °C |
| Package Type | PG-DSO-8 (8-pin SOIC) |
| Mounting Type | Surface Mount |
| Protection Features | Overcurrent, Short-Circuit, Over-Temperature, Over-Voltage |
| MSL Level | 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
BTS3405GXUMA1 Pin Configuration
| Pin 1 | IN1 — Logic input for channel 1 (CMOS/TTL) |
| Pin 2 | GND — Ground (common return for both channels) |
| Pin 3 | OUT1 — Open-drain output for channel 1 (low-side switch) |
| Pin 4 | GND — Ground |
| Pin 5 | GND — Ground |
| Pin 6 | OUT2 — Open-drain output for channel 2 (low-side switch) |
| Pin 7 | GND — Ground |
| Pin 8 | IN2 — Logic input for channel 2 (CMOS/TTL) |
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
BTS3405GXUMA1 is suitable for 6 applications: Automotive Relay Replacement, LED Driver for Automotive Lighting, Small DC Motor Control, Solenoid and Valve Drivers, General-Purpose Load Switching, Power Distribution Modules.
Automotive Relay Replacement
The BTS3405GXUMA1 is well-suited to replace electromechanical relays in automotive body electronics modules, where its 350 mA per-channel current and 42 V drain rating cover typical relay coil and lamp loads. Integrated short-circuit and over-temperature protection eliminate the need for an external fuse, while the CMOS-compatible logic inputs interface directly with 3.3 V or 5 V microcontrollers without level shifters. In practice, each channel switches the low-side of a relay coil or lamp, with the high side tied to the 12 V battery rail. The PG-DSO-8 package's exposed thermal pad enables continuous operation in the -40 °C to +125 °C automotive underhood environment without additional heatsinking.
Recommended
LED Driver for Automotive Lighting
The BTS3405GXUMA1 drives small LEDs and indicator lamps in dashboard, interior, and exterior lighting applications, providing two independently controlled low-side channels that can dim or switch individual LED strings. Its 350 mA continuous current and 0.9 Ω Rds_on minimize power dissipation when switching LEDs at 12 V or 24 V battery rails. Compared to a discrete MOSFET solution, the integrated overcurrent protection prevents LED-string short failures from damaging the wiring harness, and the over-temperature shutdown protects the switch during PCB overheat conditions. Designers place a current-sense resistor in series with each LED string and route the BTS3405GXUMA1's drain to ground.
Recommended
Small DC Motor Control
For small brushed DC motors up to 350 mA continuous, such as those used in HVAC flaps, mirror adjusters, or seat-position actuators, the BTS3405GXUMA1 provides a compact two-channel driver that replaces discrete MOSFET-plus-driver pairs. Each channel switches the motor's low-side return, with PWM control from a microcontroller GPIO for speed regulation. The integrated short-circuit protection is critical for handling motor stall conditions without external fusing. For bipolar bidirectional control, two channels can be used in an H-bridge configuration, though dedicated H-bridge drivers like BTN7971B offer better efficiency above 1 A.
Recommended
Solenoid and Valve Drivers
The BTS3405GXUMA1 drives hydraulic and pneumatic solenoid valves in industrial automation systems, where its 350 mA per-channel rating and 42 V drain voltage accommodate 24 V industrial bus rails. The integrated overcurrent and over-temperature protection handle the inrush current spikes that occur when solenoid valves open, without requiring external current-limiting circuits. Designers should add a flyback diode across each solenoid coil to suppress back-EMF at turn-off. The two independent channels allow compact PCB designs where two valves share a single 8-pin SOIC footprint, reducing board space by 50% compared to single-channel alternatives.
Recommended
General-Purpose Load Switching
In industrial control modules, the BTS3405GXUMA1 functions as a general-purpose low-side switch for activating buzzers, heaters, signal lamps, and small actuators from microcontroller logic. The dual-channel integration allows a single IC to control two independent loads, reducing BOM count and PCB area in space-constrained designs. The CMOS-compatible inputs support direct GPIO connection from 3.3 V microcontrollers, while the 42 V drain rating provides generous headroom for 24 V industrial supply rails. The integrated diagnostic and protection features simplify IEC 61131-2 compliance for industrial PLC I/O modules.
Recommended
Power Distribution Modules
The BTS3405GXUMA1 is used in distributed power distribution modules where multiple low-power rails must be switched and protected individually, such as in body control modules or industrial I/O racks. Its two channels per IC, combined with small PG-DSO-8 footprint, allow high-density switching in modules controlling 8-16 separate loads. The integrated protection features (OCP, SCP, OTP, OVP) meet automotive and industrial reliability standards without external fuses, simplifying the BOM and reducing field failures. The device's diagnostic-ready logic inputs can also feed back to a microcontroller for fault monitoring and predictive maintenance.
Recommended
Recommended Products Summary
Engineering reference data for BTS3405GXUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTS3405G | BTS3408G | BTS3110NHUMA1 | BTS4141NHUMA1 |
|---|---|---|---|---|---|
| Package | PG-DSO-8 (8-pin SOIC) | PG-DSO-8 - same | PG-DSO-8 - same | PG-DSO-8 - same | PG-DSO-8 - same |
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon |
| Number of Channels | 2 | 2 | 2 | 1 | 1 |
| Switch Topology | Low-side | Low-side | Low-side | Low-side | High-side |
| Continuous Current per Channel | 350 mA | 350 mA | 550 mA | 1.3 A | 200 mA (high-side) |
| On-State Resistance (Rds_on) | 0.9 Ω | 0.9 Ω | 0.5 Ω | 0.18 Ω | 1.5 Ω (high-side) |
| Maximum Drain/Load Voltage | 42 V | 42 V | 42 V | 42 V | 42 V |
| Integrated Protection Features | OCP, SCP, OTP, OVP | OCP, SCP, OTP, OVP | OCP, SCP, OTP, OVP | OCP, OVP, OTP | OCP, OTP, OVP |
Key Differentiators
- Dual-channel integration in 8-pin SOIC (vs BTS3110NHUMA1)
- Optimized for low-current automotive loads (vs BTS3408G)
- Low-side topology simplifies gate drive (vs BTS4141NHUMA1)
Design Notes
At a continuous load of 350 mA per channel with 0.9 Ω Rds_on at room temperature, power dissipation per channel is approximately I²R = 0.11 W, for a total of 0.22 W across both channels. The PG-DSO-8 package's thermal resistance (θJA) of approximately 110 °C/W on a standard JEDEC 2s2p test board yields a junction temperature rise of about 24 °C above ambient. For sustained operation near 350 mA, provide at least 100 mm² of copper pour connected to the exposed pad (pins 2, 4, 5, 7) to keep junction temperature below 150 °C.
Connect all four ground pins (2, 4, 5, 7) to a single solid ground plane using multiple vias to minimize parasitic inductance. Place the BTS3405GXUMA1 close to the load to minimize the high-current trace length, which reduces EMI and voltage transients during switching. Route logic input traces (IN1, IN2) away from the drain outputs (OUT1, OUT2) to avoid coupling. A 100 nF ceramic decoupling capacitor placed within 5 mm of the IC is recommended for stable logic operation, even though the device does not require a separate supply pin.
Always add a freewheeling diode (e.g., 1N4148 for small relays, or a Schottky such as SS24 for higher current) across any inductive load, in reverse-bias across the load. The BTS3405GXUMA1's 42 V drain rating does not provide sufficient margin for the unclamped inductive kick of a typical 12 V relay coil, which can exceed 100 V. Without the diode, repetitive avalanche events will degrade the internal MOSFET and shorten the device's lifetime. Additionally, do not leave the logic inputs floating - the BTS3405GXUMA1 includes internal pull-downs, but external pull-downs (10 kΩ to GND) improve noise immunity in automotive environments.
Compliance Information
RoHS and REACH compliant per Infineon product declaration. AEC-Q100 qualified for automotive applications. Lead-free matte-tin plating, halogen-free mold compound. Conflict-minerals declaration available from Infineon.
