STMicroelectronics TSM103IDT

Overview

TSM103IDT from STMicroelectronics is a dual operational amplifier with integrated 2.5 V voltage reference, featuring 0.5 mV typical input offset voltage (TSM103A grade), 350 µA/op supply current at 5 V, 0.9 MHz unity-gain bandwidth, rail-to-rail output swing from 0 V to (V_CC − 1.5 V), and wide 3–32 V single-supply operation. It is used in power supply feedback loops, battery monitoring circuits, and analog front-ends for industrial sensor signal conditioning.

For engineers reviewing the TSM103IDT datasheet, TSM103IDT pinout, TSM103IDT application, or TSM103IDT equivalent, key selection criteria include its dual-opamp + reference integration, guaranteed 0.4% reference accuracy (TSM103A), sink capability up to 100 mA, low 7 µV/°C offset drift, and SO8 package compatibility with legacy board layouts.

Technical Context

The TSM103IDT integrates two independent op-amps on one die: OP1 has its non-inverting input internally tied to a precision 2.5 V bandgap reference, while OP2 is fully independent. Both amplifiers share a common 3–32 V supply range and operate over −40°C to +105°C.

Its reference section delivers 2.475–2.525 V (0.4% initial tolerance) at 1–100 mA cathode current, with dynamic impedance ≤0.5 Ω and temperature drift ≤30 mV across full operating range. The op-amps provide 70–85 dB CMRR, 65–100 dB PSRR, and 0.2–0.4 V/µs slew rate under unity-gain conditions.

Key Specifications

Pinout & Package

Package: SO8 (Plastic Micropackage), 8-pin small outline, surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-opamp-plus-reference applications.

Compared with LM358+TL431, TSM103IDT reduces component count and improves thermal matching but offers fixed 2.5 V reference only; versus TSM103WDT, it trades lower cost for reduced accuracy and narrower temperature rating - suitable for cost-sensitive industrial controls where 0.4% reference tolerance suffices.

Availability

TSM103IDT is available at Aetrix Electronics and suitable for power supply management, battery monitoring, industrial sensor interfaces, and programmable current sources requiring stable component supply across extended temperature ranges.

Supply support for TSM103IDT 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, analog devices, and MEMS sensors for industrial, automotive, and consumer markets.

The TSM103 series belongs to ST's precision analog portfolio, engineered specifically for space-constrained power supervision and sensor signal conditioning applications where integration, accuracy, and reliability are critical.

FAQ

What is the maximum allowable cathode current for the internal voltage reference?

The TSM103IDT reference section supports 1 mA to 100 mA cathode current. Operation below 1 mA risks loss of regulation; above 100 mA exceeds safe operating area and may cause thermal shutdown or parametric shift. At 10 mA, dynamic impedance is ≤0.5 Ω and voltage deviation remains within ±30 mV over temperature.

Can OP1 be used as a standalone comparator?

Yes - OP1 can function as a comparator by applying the signal to its inverting input (Pin 4) while its non-inverting input is fixed at 2.5 V. However, it lacks built-in hysteresis or rail-to-rail output clamping; external feedback resistors are required for stable switching and noise immunity in noisy environments.

Is the TSM103IDT compatible with dual-supply operation?

Yes - the device supports ±1.5 V to ±16 V dual supplies. When operated symmetrically (e.g., ±15 V), V_CC+ = +15 V and V_CC− = −15 V, enabling true bipolar input/output swing. Input common-mode range extends to −16.5 V, and output swings to within 1.5 V of either rail.

Why is the TSM103IDT marked "Not for New Design"?

STMicroelectronics designated TSM103IDT as "Not for New Design" because the enhanced TSM103WDT offers superior specs (lower offset, higher bandwidth, wider temperature range) with identical pinout and footprint. Legacy designs may continue using TSM103IDT, but new projects should adopt TSM103WDT for long-term supply assurance and performance headroom.