ZXCT1109SA-7 Low-Power High-Side Current Sense Amplifier, 3-Pin SOT-23

The ZXCT1109SA-7 from Diodes Incorporated is a compact, low-power high-side current monitor amplifier that simplifies load current sensing without the need to disrupt the ground plane. Its design enables accurate current monitoring across a diverse range of electronic applications, from portable adapters to industrial systems.

A key advantage of this device is its wide common-mode input voltage range of 2.5V to 36V, allowing it to operate directly from the monitored line without a separate power supply rail. This line-powered operation, combined with a very low quiescent current, makes it highly efficient and suitable for power-sensitive designs. The versatile gain is set by a single external resistor, offering designers flexibility to achieve a wide range of gain settings for precise current scaling.

Core Specifications & Performance

• Bandwidth: Features a typical -3dB small signal bandwidth of 0.65MHz (650kHz), ensuring responsive signal tracking.
• Accuracy: Offers excellent common-mode rejection (0.1µA/V typical) and a low output current temperature coefficient of 370ppm/°C for stable performance over temperature.
• Low Power: Characterised by minimal input bias currents (S- input current 19nA typical) and low output current (3µA typical with zero sense voltage).
• Robust Operation: The device is specified for a broad operating temperature range from -40°C to 125°C, ensuring reliability in demanding environments.

Housed in a space-saving 3-pin SOT-23 surface-mount package, it is ideal for compact PCB designs where board real estate is at a premium. This combination of performance, versatility, and a tiny footprint makes the ZXCT1109SA-7 an excellent choice for modern electronic systems requiring reliable and efficient current monitoring.