STMicroelectronics TSC2020IYST

Overview

TSC2020IYST from STMicroelectronics is a precision bidirectional current sense amplifier with fixed 20 V/V gain, designed for high-side and low-side shunt-based current monitoring in automotive and industrial 48 V systems. It operates over -4 to +100 V common-mode voltage range, delivers ±150 µV max offset voltage, 100 dB min CMR, and supports supply voltages from 2.7 to 5.5 V - enabling accurate battery management and motor control sensing without external level-shifting.

For engineers reviewing the TSC2020IYST datasheet, TSC2020IYST pinout, TSC2020IYST application, or TSC2020IYST equivalent, this device is selected for high-CMR, low-drift current measurement in AEC-Q100-compliant 48 V power distribution, battery protection IC feedback loops, and PWM-rich motor drive current sensing where input common-mode transients exceed 100 V/µs.

Technical Context

The TSC2020IYST employs a zero-drift chopper-stabilized architecture with integrated PWM enhancer circuitry that detects fast common-mode edges (e.g., MOSFET switching) and dynamically suppresses output disturbance. Its thin-film resistor network ensures stable 20 V/V gain (±0.3% error) and 3.5 ppm/°C drift across temperature and supply voltage variations.

It features dual reference inputs (VREF1/VREF2) allowing flexible output common-mode setting - supporting unidirectional (single-supply referenced) or bidirectional (center-swing) operation. Input bias current remains below 240 µA at 48 V VICM, and spectral noise is 53 nV/√Hz at 1 kHz, enabling sub-millivolt Vsense resolution in noisy 48 V bus environments.

Key Specifications

Pinout & Package

Supplied in SO8 package (ECOPACK2, RoHS-compliant, moisture sensitivity level 3). Pinout matches industry-standard SOIC-8 footprint with exposed pad option available in MiniSO8 variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional current sensing applications.

Compared with INA240A1QDRQ1, TSC2020IYST provides superior 100 V common-mode margin and lower drift for automotive 48 V BMS; versus TSC2021IYST, it trades gain for higher Vsense headroom - ideal when shunt loss budget permits 100 mV drop.

Availability

TSC2020IYST is available at Aetrix Electronics and suitable for battery management systems, 48 V power distribution units, and automotive motor control applications requiring stable component supply across extended temperature and voltage ranges.

Supply support for TSC2020IYST 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, specializing in automotive, industrial, and power management ICs with broad analog and embedded portfolio coverage.

The TSC202x series is part of ST's precision analog current sensing product line, engineered specifically for AEC-Q100-compliant 48 V automotive electrification and high-reliability industrial power monitoring.

FAQ

What is the maximum shunt voltage the TSC2020IYST can accurately measure?

The TSC2020IYST supports a Vsense operating range of 123.8 mV (typ.) at 2.7 V supply and 238.5 mV (typ.) at 5 V supply while maintaining ≤0.3% gain error. At 20 V/V gain, this corresponds to 6.19 mV to 11.93 mV differential input - meaning full-scale accuracy is guaranteed up to ±11.93 mV across the shunt resistor under specified conditions.

Can the TSC2020IYST be used for unidirectional current sensing only?

Yes. By connecting VREF1 to VCC and VREF2 to GND, the output swings from near GND to near VCC - enabling unidirectional operation. This configuration eliminates need for bipolar supplies and simplifies interface to single-rail ADCs, while retaining full common-mode range and accuracy.

How does the PWM enhancer improve performance in motor control?

The PWM enhancer detects rapid dV/dt on the input common-mode bus (e.g., during MOSFET switching) and temporarily adjusts internal compensation to suppress output overshoot. This reduces settling time to under 7 µs after a 48 V edge, preserving current waveform fidelity for real-time torque control algorithms.

Is layout guidance available for optimal CMR performance?

Yes. ST recommends symmetric, matched trace lengths for IN+ and IN- routing; placement of GND pin adjacent to shunt ground point; and local 100 nF ceramic decoupling at VCC within 1 cm. These practices maintain >95 dB practical CMR in PCB layouts - verified in AN5022 application note.