STMicroelectronics TSZ182IYST

Overview

TSZ182IYST from STMicroelectronics is a dual precision chopper-stabilized 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 with 1 mA max supply current per channel.

For engineers reviewing the TSZ182IYST datasheet, TSZ182IYST pinout, TSZ182IYST application, or TSZ182IYST equivalent, this device is selected for ultra-low-drift analog front-ends where calibration-free accuracy, EMI robustness (EMIRR up to 85 dB at 2.4 GHz), and extended temperature stability are critical in current sensing, bridge amplification, and precision instrumentation.

Technical Context

The TSZ182IYST employs a 2.4 MHz chopper architecture that continuously corrects input offset and cancels 1/f noise in both time and frequency domains-modulating the input signal to suppress low-frequency errors before demodulation and low-pass filtering. Its CMOS input stage achieves ultra-low input bias current (≤200 pA typ.) and high common-mode rejection (126 dB typ. at 5 V).

It supports rail-to-rail operation with input common-mode range extended to (V_CC–) – 0.1 V to (V_CC+) + 0.1 V and output swing within 40 mV of rails under 10 kΩ load. Stability is maintained up to 100 nF capacitive load using ≤100 Ω isolation resistor, and it features 52–85 dB EMI rejection across 400 MHz–2.4 GHz bands.

Key Specifications

Pinout & Package

TSZ182IYST is supplied in DFN8 2×2 mm package with wettable flank leads and exposed thermal pad (connected to V_CC– or left floating). Pin 1 is marked by dot; pinout is identical across all TSZ182 variants.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-accuracy chopper-stabilized op-amp applications.

Compared with TSZ122IYST, TSZ182IYST trades 40× higher quiescent current for 7.5× greater bandwidth and superior EMI resilience-critical for automotive current sensing. Against TSV732IYDT, it adds chopper-based drift cancellation and AEC-Q100 compliance at modest cost premium for safety-critical measurement.

Availability

TSZ182IYST is available at Aetrix Electronics and suitable for automotive battery management, medical biosignal acquisition, industrial pressure transduction, and legal-for-trade weighing systems requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for TSZ182IYST 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 sensor solutions for industrial, automotive, and consumer markets.

TSZ182IYST belongs to ST's TSZ18x zero-drift op-amp family, engineered specifically for calibration-free precision in harsh environments-targeting automotive current sensing, medical diagnostics, and industrial process control where thermal stability and EMI immunity are non-negotiable.

FAQ

What is the maximum capacitive load the TSZ182IYST can drive without external compensation?

The TSZ182IYST remains stable with up to 100 pF capacitive load in unity-gain configuration without added series resistance. For loads exceeding 100 pF-up to 1 µF-a small isolation resistor (8–100 Ω, depending on load value) is required at the output to maintain ≥47° phase margin and prevent overshoot. This is documented in Figure 51–53 and Table 6 of DS11863 Rev 8.

Does the exposed thermal pad on the DFN8 package require solder connection?

Yes-the exposed pad on the TSZ182IYST DFN8 2×2 mm package must be soldered to a PCB copper pour connected to V_CC– to ensure thermal performance and electrical stability. Thermal resistance junction-to-ambient is specified at 57 °C/W only when the pad is properly soldered and thermally coupled; leaving it floating degrades R_thJA by >2× and risks parametric shift at high ambient temperatures.

How does the chopper architecture affect signal integrity at frequencies near the 2.4 MHz clock?

The 2.4 MHz chopper clock introduces minimal in-band energy due to internal low-pass filtering; residual ripple is suppressed to <0.4 µV_PP (0.1–10 Hz) and does not alias into baseband. At higher frequencies (>100 kHz), chopper artifacts are negligible-verified by Figure 29–30 noise spectra and Figure 44 crosstalk data showing >120 dB channel separation at 1 kHz.

Can TSZ182IYST operate with single-supply 2.2 V while maintaining rail-to-rail output swing?

Yes-TSZ182IYST fully supports 2.2 V single supply with rail-to-rail output: VOL ≤30 mV and VOH ≤40 mV (typ.) at 25 °C into 10 kΩ load to V_CC/2, per Table 3. Common-mode input range extends from –0.1 V to V_CC + 0.1 V, enabling direct interface with low-voltage sensors and ADCs without level-shifting circuitry.