STMicroelectronics TSM103ID

Overview

TSM103ID from STMicroelectronics is a dual operational amplifier with integrated 2.5V voltage reference, featuring one independent op-amp and one op-amp with non-inverting input tied to the internal reference. It delivers 0.5mV typical input offset voltage (TSM103A grade), 0.9MHz unity-gain bandwidth, 350µA/op supply current at 5V, rail-to-rail output swing (0V to VCC–1.5V), and operates from 3V to 32V single or ±1.5V to ±16V dual supply - widely used in power supply feedback loops and analog sensor signal conditioning.

For engineers reviewing the TSM103ID datasheet, TSM103ID pinout, TSM103ID application, or TSM103ID equivalent, key selection criteria include its dual-op-amp + reference integration, 2.5V ±0.4% reference accuracy, low quiescent current per amplifier, wide common-mode input range including ground, and SO8 package compatibility for space-constrained industrial control and DC-DC converter monitoring designs.

Technical Context

The TSM103ID integrates two distinct op-amp channels: OP1 has its non-inverting input internally connected to a precision 2.5V bandgap reference, enabling immediate use as a comparator or error amplifier in regulated power supplies; OP2 is fully independent with standard differential inputs. Both amplifiers share a common supply rail and operate over –40°C to +105°C.

Its reference section provides 2.5V output with 0.4% initial accuracy (TSM103A), 7mV max drift over temperature, 0.2Ω typical dynamic impedance, and 1–100mA sink capability - allowing direct use as a stable reference for ADCs, DACs, or as a bias source without external components.

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-op-amp-with-reference applications.

Compared with LM358+TL431, TSM103ID saves board space and improves thermal stability; compared with TSM103WIDT, it lacks updated process and qualification but remains viable for cost-sensitive, non-automotive legacy systems where obsolescence risk is managed.

Availability

TSM103ID is available at Aetrix Electronics and suitable for switching power supply feedback, industrial sensor signal conditioning, programmable current source control, and overvoltage protection circuits requiring stable component supply across extended temperature ranges.

Supply support for TSM103ID 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 analog, MCU, power, and MEMS products for industrial, automotive, and consumer markets.

The TSM103 series belongs to ST's precision analog portfolio, engineered specifically for cost-sensitive power management and sensor interface applications where integration of reference and amplification reduces system complexity and improves reliability.

FAQ

Can TSM103ID operate from a single 3.3V supply?

Yes - TSM103ID supports single-supply operation down to 3V. With VCC+ = 3.3V and VCC− = GND, OP1 and OP2 deliver usable output swing from ~0V to ~1.8V, and the 2.5V reference remains valid and stable. Input common-mode range includes ground, enabling direct connection of low-voltage sensors.

Is the internal 2.5V reference accessible as a standalone output?

No - the 2.5V reference is not brought out to a dedicated pin. It is hard-wired only to the non-inverting input of OP1. However, OP1's output can be configured as a buffered reference (e.g., unity-gain follower) to provide a low-impedance 2.5V source with 0.2Ω effective output impedance.

What is the maximum capacitive load the reference can drive without instability?

The internal reference is stable with up to 100nF capacitive load, as verified in ST's application note AN2197. For loads >100nF, a series 10Ω resistor is recommended between the OP1 output (configured as follower) and the capacitor to maintain phase margin above 45°.

Does TSM103ID support rail-to-rail input or output?

TSM103ID supports rail-to-rail output swing (0V to VCC–1.5V) but not rail-to-rail input: the input common-mode range extends to ground but stops at (VCC–1.5V). Neither input can safely exceed VCC+ by more than 0.3V or go below ground by more than 0.3V - absolute maximum ratings must be observed.