STMicroelectronics TSX7191ILT

Overview

TSX7191ILT from STMicroelectronics is a single, decompensated, rail-to-rail input/output operational amplifier optimized for precision signal conditioning in low-voltage and automotive systems. It delivers 9 MHz gain bandwidth, 200 µV max input offset voltage (TSX7191), 850 µA max supply current, and operates across 2.7–16 V supply with guaranteed stability at gain ≥10. Used in high-impedance sensor interfaces and current-sensing circuits where rail-to-rail swing and low drift are critical.

For engineers reviewing the TSX7191ILT datasheet, TSX7191ILT pinout, TSX7191ILT application, or TSX7191ILT equivalent, key selection criteria include its decompensated architecture requiring minimum gain of 10, ±0.1 V beyond rails common-mode range, 4 kV HBM ESD rating, and extended -40 °C to +125 °C operation - all validated per AEC-Q100 for automotive use.

Technical Context

The TSX7191ILT employs a decompensated two-stage CMOS op-amp architecture requiring closed-loop gain ≥10 for phase margin ≥42°, with GBP ranging from 5 MHz (at 4 V) to 9 MHz (at 10 V). Its rail-to-rail input stage uses complementary PMOS/NMOS differential pairs enabling Vicm from V_CC− − 0.1 V to V_CC+ + 0.1 V, while the output stage delivers <60 mV saturation voltage into 10 kΩ at both rails.

Input bias current is limited to 50 pA max due to MOSFET input structure, supporting high-Z sensor interfacing; long-term V_IO drift reaches 500 µV after 1000 h at 125 °C (extrapolated); CMRR exceeds 94 dB over full common-mode range at 16 V supply.

Key Specifications

Pinout & Package

SOT23-5 package: ultra-compact 2.9 mm × 1.6 mm surface-mount outline with 0.95 mm pitch, thermally enhanced for industrial and automotive board layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSX7191AILT, TSX7191ILT trades 100 µV lower offset for lower cost while retaining identical stability, rail-to-rail behavior, and automotive qualification; versus TSX561ILT, it delivers 10× higher bandwidth at 1000× higher quiescent current - making it suitable for speed-critical, moderate-power precision roles.

Availability

TSX7191ILT is available at Aetrix Electronics and suitable for battery-powered instrumentation, automotive current sensing, medical front-ends, and industrial active filtering requiring stable component supply across extended temperature ranges.

Supply support for TSX7191ILT 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, designing and manufacturing analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

The TSX7191 series belongs to ST's precision rail-to-rail op amp product line, engineered specifically for high-accuracy, wide-supply, and automotive-grade signal conditioning in space-constrained applications.

FAQ

Can TSX7191ILT be used at unity gain?

No - TSX7191ILT is decompensated and unstable below gain ≥10. Attempting unity-gain configuration causes oscillation due to insufficient phase margin (<10°). For G = 1 applications, use TSX561ILT or add external compensation (e.g., capacitor across feedback resistor), though ST does not characterize or guarantee performance in such configurations.

What is the maximum capacitive load the output can drive?

The TSX7191ILT output remains stable with ≤100 pF capacitive load when configured at gain ≥10 and driving a 10 kΩ resistive load. Driving >100 pF (e.g., long PCB traces or ADC input capacitance) requires isolation via a series resistor (≥100 Ω) to prevent peaking or ringing, as confirmed in Figure 24 of the datasheet.

Does TSX7191ILT support dual-supply operation?

Yes - TSX7191ILT operates with split supplies (e.g., ±2.7 V to ±8 V) as long as total V_CC+ − V_CC− stays within 2.7–16 V. The input common-mode range extends 0.1 V beyond each rail, enabling symmetric signal handling; however, the datasheet specifies performance only for single-supply conditions (V_CC− = 0 V).

How does input ESD protection affect overvoltage tolerance?

Internal ESD diodes clamp input pins to V_CC+ and V_CC−; exceeding either rail by >0.5 V forward-biases these diodes, permitting up to 10 mA current before damage. To protect against transient overvoltage, always limit input current with series resistors (e.g., 10 kΩ for ±20 V transients), as shown in Figure 30 of the datasheet.