STMicroelectronics TS1872AIST

Overview

TS1872AIST from STMicroelectronics is a dual, rail-to-rail input/output operational amplifier optimized for low-voltage, low-power applications. It operates from 1.8 V to 6 V supply, delivers 1.6 MHz gain bandwidth product, consumes 400 µA per channel, and features extended common-mode input range (V_CC− − 0.2 V to V_CC+ + 0.2 V) at 25 °C - enabling use in battery-powered audio drivers and portable sensor interfaces.

For engineers reviewing the TS1872AIST datasheet, TS1872AIST pinout, TS1872AIST application, or TS1872AIST equivalent, key selection criteria include its 1.8 V minimum supply, rail-to-rail output swing within 100 mV of rails (600 Ω load), 65 mA typical output drive, ±2 kV HBM ESD rating, and MiniSO-8 package compatibility with space-constrained portable designs.

Technical Context

The TS1872AIST implements a CMOS input stage enabling rail-to-rail input operation beyond the supply rails by ±200 mV and rail-to-rail output swing down to 100 mV from each rail under 600 Ω load. Its unity-gain-stable architecture supports stable operation with capacitive loads up to 100 pF and maintains ≥53° phase margin across temperature and supply voltage ranges.

It achieves 27 nV/√Hz input voltage noise at 1 kHz and 0.01% THD, supporting high-fidelity signal conditioning. The device exhibits 65–80 dB CMRR and 70–90 dB SVRR over 1.8–5 V supply, with input offset voltage drift of only 2 µV/°C - critical for precision DC-coupled sensor front-ends in industrial and portable equipment.

Key Specifications

Pinout & Package

TS1872AIST is housed in an 8-pin MiniSO-8 package (3.0 mm × 4.9 mm, 0.65 mm pitch), RoHS-compliant and ECOPACK® certified. This thermally enhanced SOIC variant offers 190 °C/W junction-to-ambient thermal resistance, supporting operation up to +125 °C ambient in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual rail-to-rail op-amp applications.

Compared with MCP6022-I/SN and TLV9002IDR, TS1872AIST uniquely balances 1.8 V operation, extended Vicm, 1.6 MHz GBP, and 400 µA/ch consumption - making it the only choice for precision DC-coupled, low-voltage dual-channel amplification where rail extension and moderate speed coexist.

Availability

TS1872AIST is available at Aetrix Electronics and suitable for portable audio drivers, battery-powered sensor interfaces, laptop touchpad signal chains, and industrial handheld meter front-ends requiring stable component supply across automotive-grade and commercial temperature ranges.

Supply support for TS1872AIST 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, analog ICs, power management devices, and MEMS sensors for industrial, automotive, and consumer markets.

The TS187x series belongs to ST's precision analog portfolio, engineered specifically for low-voltage, low-power signal conditioning in battery-constrained portable and wearable electronics - emphasizing rail-to-rail performance, thermal robustness, and long-term supply stability.

FAQ

What is the maximum capacitive load the TS1872AIST can drive while maintaining stability?

The TS1872AIST is unity-gain stable with capacitive loads up to 100 pF, as verified by phase margin ≥53° in the datasheet (Figure 33). Driving larger loads requires isolation resistors (e.g., 10–100 Ω in series with the output) to prevent peaking or oscillation, especially when routing to connectors or long traces.

Does the TS1872AIST support true single-supply operation with input signals near ground?

Yes - its common-mode input range extends to V_CC− − 0.2 V at 25 °C, allowing inputs as low as −0.2 V relative to ground when V_CC− = 0 V. This enables direct interfacing with grounded sensors or DACs without level-shifting, provided input current remains within ±1 mA limits per absolute maximum ratings.

How does the output voltage swing vary with load resistance?

At V_CC = 3 V and T_A = 25 °C, the output swings to 2.82 V (high) and 39 mV (low) into 2 kΩ, and to 2.80 V (high) and 58 mV (low) into 600 Ω. Swing degrades linearly with heavier loads due to internal output impedance; full rail-to-rail swing is only achievable into >10 kΩ loads.

Is the TS1872AIST pin-compatible with other dual op-amps in MiniSO-8 packages?

No - TS1872AIST uses a non-standard MiniSO-8 pinout (1: In− Ch1, 2: In+ Ch1, 3: Out Ch1, 4: V_CC−, 5: V_CC+, 6: In+ Ch2, 7: In− Ch2, 8: Out Ch2). It is not pin-compatible with industry-standard dual op-amps like LMV358 or MCP6022, which place V_CC+ on Pin 8 and V_CC− on Pin 4.