STMicroelectronics TSC103IDT

Overview

TSC103IDT from STMicroelectronics is a high-voltage, high-side current sense amplifier with independent supply and input common-mode voltage domains. It supports 2.9 V to 70 V common-mode range (single-supply), 20–100 V/V pin-selectable gain, ≤360 µA quiescent current, and operates from −40 °C to +125 °C. It enables precision shunt-based current monitoring in automotive battery management and industrial DC motor control systems.

For engineers reviewing the TSC103IDT datasheet, TSC103IDT pinout, TSC103IDT application, or TSC103IDT equivalent, key selection criteria include its wide common-mode survival range (−16 V to 75 V), buffered rail-to-rail output, dual-supply configurability (Vcc− pin), and guaranteed output accuracy of ±2.5% at 25 °C for 50 mV sense voltage.

Technical Context

The TSC103IDT implements a two-stage architecture: a precision differential sense amplifier followed by a unity-gain voltage buffer. Its input stage operates independently of supply rails, enabling accurate measurement even when Vp/Vm exceed Vcc+ - critical for load-dump and reverse-battery protection in automotive systems.

Gain is set via two digital SEL pins (SEL1/SEL2) selecting discrete resistor ratios (20/25/50/100 V/V); no external feedback components are required. The output stage delivers ±10 mA drive capability with <135 mV saturation voltage and 700 kHz bandwidth at Av = 50 V/V, supporting fast transient response in closed-loop motor or power supply control.

Key Specifications

Pinout & Package

TSC103IDT is housed in an 8-pin TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant and ECOPACK® certified. The compact footprint supports high-density PCB layouts in space-constrained automotive ECUs and industrial controllers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX4080FASA+, the TSC103IDT uniquely balances wide survivable common-mode range (−16 V to 75 V), pin-selectable gain, and dual-supply configurability - making it optimal for cost-sensitive, multi-rail automotive and industrial systems requiring field-programmable gain without redesign.

Availability

TSC103IDT is available at Aetrix Electronics and suitable for automotive battery management, industrial DC motor control, photovoltaic string monitoring, and uninterruptible power supply designs requiring stable component supply across extended temperature and voltage stress conditions.

Supply support for TSC103IDT 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog products for automotive, industrial, and consumer markets.

The TSC103IDT belongs to ST's high-voltage precision analog portfolio, engineered specifically for robust current sensing in harsh automotive and industrial environments where reverse-battery, load-dump, and wide common-mode operation are mandatory.

FAQ

What is the maximum allowable voltage difference between Vcc+ and Vcc−?

The absolute maximum voltage between Vcc+ and Vcc− is 15 V, as specified in Table 2 of the datasheet. Exceeding this risks permanent damage to the internal ESD structures. In dual-supply operation, typical use cases apply −5 V to Vcc− with +5 V on Vcc+, resulting in a safe 10 V differential that enables the −2.1 V to +65 V common-mode range.

Can TSC103IDT measure bidirectional current?

No - the TSC103IDT is unidirectional. Its output voltage increases monotonically with positive (Vp > Vm) differential input; it does not support negative Vsense interpretation or zero-crossing detection. For bidirectional sensing, ST recommends the TSC102 or TSC201 families, which feature symmetric input stages and centered output quiescent points.

Is external filtering required on the Out pin for ADC interfacing?

Not strictly required, but recommended. The TSC103IDT's 700 kHz bandwidth may alias high-frequency switching noise into the ADC sample. A simple RC filter (e.g., 10 kΩ + 100 pF → 160 kHz cutoff) placed between Out and ADC input reduces noise without degrading step response for 10 kHz current control loops.

How does the TSC103IDT handle input overvoltage beyond its common-mode rating?

It survives transient overvoltages up to −16 V and +75 V on Vp/Vm pins due to integrated Zener-like clamp structures, as verified in absolute maximum ratings. However, continuous operation outside the 2.9 V–70 V operating range causes gain nonlinearity and increased offset drift; sustained exposure above +75 V or below −16 V risks irreversible junction breakdown.