STMicroelectronics TSX9291ILT

Overview

TSX9291ILT from STMicroelectronics is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for high-speed, wide-supply applications. It delivers 16 MHz gain bandwidth, 27 V/µs slew rate, and 0.0003 % THD+N at 1 kHz with 4 V–16 V supply, enabling precision signal conditioning in automotive I/V amplifiers and active filtering circuits.

For engineers reviewing the TSX9291ILT datasheet, TSX9291ILT pinout, TSX9291ILT application, or TSX9291ILT equivalent, key selection criteria include minimum stable gain (≥ +2 or ≤ –1), rail-to-rail operation across extended temperature (–40 °C to +125 °C), ESD tolerance (4 kV HBM), and decompensated stability under capacitive load conditions.

Technical Context

The TSX9291ILT is a decompensated op amp requiring closed-loop gain ≥ +2 or ≤ –1 for phase margin ≥ 60°; its internal compensation avoids external components while supporting fast settling (245 ns to 0.1 %) and low distortion in unity-gain-stable configurations only when externally compensated. It uses CMOS input stage architecture delivering 10 pA typical input bias current and 1 TΩ input resistance.

Its rail-to-rail input extends from V_CC– – 0.1 V to V_CC+ + 0.1 V, and rail-to-rail output swings within 150 mV of either rail at 16 V supply with 10 kΩ load. The device maintains 16 MHz GBP and 26–29 V/µs slew rate across 4–16 V supply and full temperature range, validated per AEC-Q100 Grade 1 automotive qualification.

Key Specifications

Pinout & Package

SOT23-5 package (3.04 mm × 1.4 mm × 1.1 mm), surface-mount, lead-free, RoHS-compliant. Thermal resistance R_thJA = 250 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSX9292IDT, TSX9291ILT saves board area and power in single-amplifier roles; versus TSV911ILT, it enables robust 12–16 V operation with superior speed, noise, and automotive reliability - critical for safety-critical sensing.

Availability

TSX9291ILT is available at Aetrix Electronics and suitable for automotive powertrain control, industrial process instrumentation, and high-fidelity test equipment requiring stable component supply across extended temperature and voltage ranges.

Supply support for TSX9291ILT 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 microcontrollers, analog ICs, power devices, and sensors for industrial, automotive, and consumer markets.

The TSX92 series targets high-performance, rail-to-rail op amps for automotive-qualified signal conditioning - engineered specifically for unity-gain stability with external compensation and wide-supply operation in harsh environments.

FAQ

Can TSX9291ILT operate stably at unity gain?

No - TSX9291ILT is decompensated and requires minimum closed-loop gain of +2 or –1 for stability. Unity-gain operation causes peaking and potential oscillation unless external compensation (e.g., feedback capacitor ≥8 pF) is applied. Figure 24 in the datasheet validates stable G = –1 response with Cf = 8 pF.

What is the maximum capacitive load it can drive without compensation?

TSX9291ILT drives up to 20 pF resistively loaded (R_L = 10 kΩ) with <5 % overshoot and no oscillation at G = –1 (Figure 22). Driving >20 pF requires series output resistance or feedback capacitor; 47 pF load induces instability unless R_f/R_g ratio and C_f are adjusted per Figure 19.

Is the input stage protected against overvoltage beyond rails?

No internal clamping diodes exist between inputs. Absolute maximum differential input voltage is ±V_CC (Table 2), and common-mode range is V_CC– – 0.2 V to V_CC+ + 0.2 V. External Schottky diodes are recommended if inputs may exceed rails during power sequencing or fault conditions.

How does performance change at 4 V supply versus 16 V?

At 4 V, GBP drops to 15.6 MHz and slew rate reduces to 27 V/µs (same typ value), but output drive capability falls to 16 mA sink/source (vs. 45/65 mA at 16 V). Input offset remains 4–5 mV, but THD+N rises to 0.002 % due to reduced headroom - verified in Table 4.