STMicroelectronics TSC199A1ICT

Overview

TSC199A1ICT from STMicroelectronics is a zero-drift current sense amplifier with 50 V/V fixed gain, designed for high-precision bidirectional current measurement across -0.3 V to 26 V common-mode voltage range. It delivers ±150 µV max offset voltage, 1.5% max gain error, 0.5 µV/°C max offset drift, and operates from 2.7 V to 26 V supply over -40 °C to 125 °C - enabling accurate shunt-based sensing in battery chargers and industrial power rails.

For engineers reviewing the TSC199A1ICT datasheet, TSC199A1ICT pinout, TSC199A1ICT application, or TSC199A1ICT equivalent, key selection criteria include its SC70-6 package footprint, RTI-referred input noise of 40 nV/√Hz, 100 kHz bandwidth (TSC199A1), 100 µA max quiescent current, and compatibility with low-side/high-side sensing topologies requiring sub-10 mV full-scale resolution.

Technical Context

The TSC199A1ICT implements a chopper-stabilized zero-drift architecture that actively corrects input offset and drift, achieving 0.1–0.5 µV/°C temperature coefficient and 120 dB CMRR over -40 °C to 125 °C. Its input stage accepts differential voltages up to ±26 V while maintaining operation at supply voltages as low as 2.7 V.

It features rail-to-rail output swing (VCC − 0.2 V / 0.05 V), supports capacitive loads up to 470 pF without oscillation, and uses internal resistor networks (1 MΩ R1/R2, 20 kΩ R3/R4) to set its precise 50 V/V gain - eliminating external gain-setting components and reducing layout sensitivity.

Key Specifications

Pinout & Package

Package: SC70-6 (1.8 × 1.4 mm footprint, 0.95 mm height), RoHS-compliant ECOPACK2, suitable for space-constrained PCB layouts in notebook and telecom modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar zero-drift current sense amplifier applications.

Compared with INA219BIDR and MAX40056ASA+, the TSC199A1ICT provides optimal balance of wide supply/common-mode range, fixed-analog output, SC70-6 footprint, and guaranteed 0.5 µV/°C drift - making it ideal for industrial and telecom designs needing robust, calibration-free analog current sensing without digital interface complexity.

Availability

TSC199A1ICT is available at Aetrix Electronics and suitable for battery chargers, industrial power rails, notebook power management, and telecom DC-DC converters requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.

Supply support for TSC199A1ICT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering automotive, industrial, and power management solutions with emphasis on reliability, energy efficiency, and functional safety.

The TSC199 series belongs to ST's precision analog portfolio, engineered specifically for high-accuracy, low-drift current sensing in harsh industrial and computing environments where shunt-based measurement must remain stable across wide voltage, temperature, and time domains.

FAQ

What is the maximum capacitive load the TSC199A1ICT output can drive without instability?

The TSC199A1ICT output is stable with capacitive loads up to 470 pF, as verified in the DS14398 datasheet Section 3 (Electrical Characteristics). This allows direct connection to typical SAR ADC inputs, RC anti-aliasing filters, or scope probes without external isolation resistors. Exceeding 470 pF may cause peaking or oscillation due to phase margin reduction.

Can the TSC199A1ICT operate with a 3.3 V supply while measuring a 24 V common-mode signal?

Yes - the TSC199A1ICT supports common-mode input voltages from −0.3 V to +26 V independently of VCC, which can be as low as 2.7 V. With VCC = 3.3 V, VIN+ and VIN− may sit at 24 V and 23.95 V respectively (50 mV drop), and the device will accurately amplify the differential signal to ~2.5 V output while remaining fully functional.

Is the REF pin required for basic current sensing operation?

No - the REF pin is optional. When left floating, tied to GND, or connected to VCC, the output centers at mid-supply (VCC/2) by default. Only use REF to shift output offset (e.g., to match ADC input range); no external reference source is needed for standard unidirectional or bidirectional sensing.

How does the TSC199A1ICT handle reverse current flow in bidirectional applications?

The TSC199A1ICT inherently supports bidirectional sensing: when current flows opposite the assumed direction, VIN− rises above VIN+, producing a negative differential input (VSENSE < 0). Its rail-to-rail output swings down to 0.05 V, allowing the host ADC to resolve direction and magnitude - confirmed by datasheet specifications covering full ±5 mV input range and symmetric linearity error.