STMicroelectronics TSC1031IYDT

Overview

TSC1031IYDT from STMicroelectronics is a high-voltage, high-side current sense amplifier in TSSOP-8 package, delivering 50 V/V or 100 V/V pin-selectable gain, ±500 µV input offset voltage (typ), and 90–105 dB DC common-mode rejection. It operates from 2.7–5.5 V supply with ≤360 µA quiescent current and supports 2.9–70 V input common-mode range in single-supply mode-enabling precise shunt-based current monitoring in automotive battery management and photovoltaic string monitoring.

For engineers reviewing the TSC1031IYDT datasheet, TSC1031IYDT pinout, TSC1031IYDT application, or TSC1031IYDT equivalent, key selection criteria include its dual-supply configurable common-mode range (-2.1 to 65 V), buffered rail-to-rail output stage, EMI-hardened internal architecture, and guaranteed ±4% total output voltage accuracy across -40°C to +125°C.

Technical Context

The TSC1031 implements a precision current multiplier topology with fixed K1 = Rg3/Rg1 = 10 and digitally selectable K2 = 2.5 or 5 via the SEL pin, yielding total gains of Av = 2·K1·K2 = 50 or 100 V/V. Its input stage uses matched resistive feedback to force Vp ≈ Vm while rejecting common-mode transients up to 75 V.

It features independent supply and input common-mode domains: Vcc+ and Gnd define logic/IO reference, while Vcc− sets the negative rail for dual-supply operation and shifts the Vicm window. The buffered output stage delivers ±10 mA drive capability with <135 mV saturation voltage and 700 kHz bandwidth at Av = 50 V/V.

Key Specifications

Pinout & Package

TSC1031IYDT is housed in a RoHS-compliant TSSOP-8 (3 × 3 mm, 0.65 mm pitch) thermally enhanced plastic package with exposed pad for improved heat dissipation in high-temperature automotive applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4080TASA+ and INA240A1D, the TSC1031IYDT uniquely balances pin-selectable gain, 700 kHz bandwidth, and automotive-grade transient robustness-making it optimal for cost-sensitive, thermally demanding high-speed current sensing where gain adaptability is required.

Availability

TSC1031IYDT is available at Aetrix Electronics and suitable for automotive battery management, photovoltaic string monitoring, and industrial UPS current sensing requiring stable component supply across extended temperature and voltage ranges.

Supply support for TSC1031IYDT 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, specializing in automotive, industrial, and power management ICs with broad manufacturing and quality certifications including AEC-Q100 and ISO/TS 16949.

The TSC1031 belongs to ST's high-voltage precision analog portfolio, designed specifically for robust, high-accuracy current sensing in electrically noisy and thermally aggressive environments such as automotive power distribution and renewable energy systems.

FAQ

What is the maximum allowable common-mode voltage during load-dump events?

The TSC1031IYDT survives up to +75 V on Vp and Vm pins relative to Vcc−, meeting ISO 7637-2 Pulse 5a requirements for 24 V commercial vehicles. This rating applies regardless of supply configuration and does not require external clamping components under standard test conditions.

Can the SEL pin be left floating?

No-SEL must be actively driven to either Gnd (for 50 V/V gain) or Vcc+ (for 100 V/V gain). Floating SEL may cause undefined gain behavior and output instability due to internal comparator ambiguity; a 10 kΩ pull-down or pull-up resistor is recommended if driven by an open-drain GPIO.

Does the TSC1031IYDT require external compensation capacitors?

No external compensation is required for stability-the internal amplifier is unity-gain stable and optimized for direct connection to standard ADC input circuits. However, external RC filters (Rf1/Rf2/Cf) are recommended on Vp/Vm for EMI suppression per AN4304, especially in automotive or industrial switch-mode environments.

How does the A1 pin function in the TSC1031IYDT?

A1 is an internal node connecting the current multiplier output to the output buffer input; it is not intended for external connection. Datasheet Figure 22 shows A1 as a test point only-leaving it unconnected ensures proper gain accuracy and avoids parasitic loading that degrades CMRR and bandwidth performance.