STMicroelectronics TSZ181ILT

Overview

TSZ181ILT from STMicroelectronics is a single-channel, chopper-stabilized precision operational amplifier designed for high-accuracy sensor signal conditioning in automotive and medical systems. It delivers 25 µV max input offset voltage at 25 °C, 35 µV over –40 to 125 °C, rail-to-rail I/O, 3 MHz gain bandwidth product, and operates from 2.2–5.5 V supply with only 1 mA max supply current.

For engineers reviewing the TSZ181ILT datasheet, TSZ181ILT pinout, TSZ181ILT application, or TSZ181ILT equivalent, this device is selected for ultra-low-drift analog front-ends where calibration-free accuracy, EMI robustness (72 dB @ 1.8 GHz), and extended temperature operation are critical - especially in current-sense amplifiers and bridge sensor interfaces.

Technical Context

The TSZ181ILT implements a 2.4 MHz chopper-stabilized architecture that continuously corrects input offset and cancels 1/f noise in both time and frequency domains. Its dual-phase modulation-demodulation path ensures near-zero drift (0.1 µV/°C) and enables stable DC precision without trimming.

It features rail-to-rail input common-mode range (V_CC– − 0.1 V to V_CC+ + 0.1 V), output swing within 40 mV of rails under 10 kΩ load, and integrated ESD protection (4 kV HBM). The amplifier maintains 108 dB CMRR and 123 dB SVR at 5 V, supporting high-side and low-side sensing in noisy automotive environments.

Key Specifications

Pinout & Package

TSZ181ILT is supplied in SOT23-5 package (5-pin plastic surface-mount), with exposed pad electrically unconnected (floating). Pin functions are validated per DS11863 Rev 8, Figure 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSZ181ILT, TSZ121 trades bandwidth for 25× lower quiescent current, while TSV731 matches key specs but omits AEC-Q100 qualification - making TSZ181ILT the only choice for safety-critical automotive current sensing where both precision and qualification are mandatory.

Availability

TSZ181ILT is available at Aetrix Electronics and suitable for automotive battery management, medical ECG monitoring, and industrial strain-gauge signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TSZ181ILT 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, delivering intelligent power, analog, MEMS, and microcontroller solutions for automotive, industrial, and consumer markets.

The TSZ18x family is part of ST's precision analog portfolio, engineered specifically for chopper-stabilized, zero-drift signal conditioning in harsh automotive and high-reliability medical environments.

FAQ

What is the maximum capacitive load the TSZ181ILT can drive without external compensation?

The TSZ181ILT remains stable with capacitive loads up to 200 pF when configured in unity gain. For loads exceeding 200 pF, a series isolation resistor (R_iso) ≤50 Ω is required at the output - verified per Figure 51–53 in DS11863 Rev 8. This resistor introduces negligible voltage division error (<0.5%) due to the amplifier's low output impedance.

Does the TSZ181ILT require external filtering to suppress chopper ripple?

No external filtering is required for most applications. The internal low-pass filter suppresses chopper ripple to <0.4 µV_PP (0.1–10 Hz), and the 2.4 MHz fundamental is easily attenuated by standard PCB layout practices. An optional external RC filter may be added only if system-level EMI testing reveals residual 2.4 MHz coupling into sensitive downstream stages.

Can the TSZ181ILT operate from a single 2.2 V supply while maintaining rail-to-rail input capability?

Yes. At V_CC+ = 2.2 V and V_CC– = 0 V, the input common-mode range extends from –0.1 V to +2.3 V, fully covering the supply rails. Output swings to within 40 mV of each rail under 10 kΩ load, enabling true single-supply operation in space-constrained, low-voltage sensor nodes.

How does the TSZ181ILT's EMI rejection ratio compare across cellular frequency bands?

The TSZ181ILT achieves 52 dB rejection at 400/900 MHz, 72 dB at 1.8 GHz, and 85 dB at 2.4 GHz (per Table 5, EMIRR test conditions). This progressive improvement reflects optimized internal filtering for modern wireless bands, making it especially effective in telematics and ADAS modules co-located with Bluetooth/WiFi antennas.