8-channel low-side driver for distributed loads
The Texas Instruments TPL9201PWPR is an 8-channel low-side N-channel power driver in a 20-HTSSOP package, designed for general-purpose switched-load applications. Each of the eight outputs delivers up to 150 mA, controlled via a serial interface, with a load supply range of 7 V to 18 V. The driver integrates fixed current limiting and over-temperature protection, reducing external protection components. Rated for -40°C to 125°C, it suits industrial and automotive environments where multiple low-power loads — relays, solenoids, indicator LEDs — need to be switched from a single controller.
What the 150 mA per channel means for your BOM
The 150 mA per-output rating sets the load budget for each channel. At 150 mA continuous, the device handles small relays, indicator LEDs, and low-power solenoids without external driver transistors. The fixed current limiting protects against output shorts without a sense resistor, saving board area and BOM cost. The 1:8 input-to-output ratio means one serial interface controls all eight channels, keeping the MCU pin count low.
Package and thermal considerations
The 20-HTSSOP package includes an exposed thermal pad that must be soldered to a PCB copper plane for heat dissipation. The -40°C to 125°C operating range covers engine-bay and outdoor telecom enclosures.
Lifecycle and sourcing posture
It is sourced through independent distribution and quoted to order against an RFQ. For dual-sourcing resilience, no pin-compatible second source is listed in the official documentation; the part is sole-sourced from Texas Instruments.