STMicroelectronics TSZ124IQ4T

Overview

TSZ124IQ4T from STMicroelectronics is a quad-channel, rail-to-rail input/output precision operational amplifier featuring chopper-stabilized architecture for ultra-low offset voltage (5 µV max at 25 °C, 8 µV over -40 to 125 °C), 400 kHz gain bandwidth product, and micropower operation (40 µA max per amplifier at 5 V). It operates from 1.8–5.5 V supply and targets high-accuracy sensor signal conditioning in battery-powered medical instrumentation.

For engineers reviewing the TSZ124IQ4T datasheet, TSZ124IQ4T pinout, TSZ124IQ4T application, or TSZ124IQ4T equivalent, this page delivers verified electrical specs, package-specific terminal mapping, real-world use cases in portable diagnostics and low-power analog front-ends, and validated alternative options with documented functional trade-offs.

Technical Context

The TSZ124IQ4T implements a 400 kHz chopper-stabilized architecture that continuously corrects input offset and 1/f noise via dual-phase modulation-demodulation at 400 kHz, enabling near-zero drift (10–30 nV/°C) and 0.75 µVpp low-frequency noise (0.1–10 Hz). Its CMOS input stage delivers ultra-low bias current (≤300 pA over temperature) and rail-to-rail common-mode range (VCC− −0.1 V to VCC+ +0.1 V).

It supports stable operation with 100 pF capacitive loads, achieves 55–56° phase margin across supply voltages (1.8–5.5 V), and maintains 110–136 dB CMRR and 120–140 dB PSRR - critical for precision DC-coupled measurement paths in noisy, low-voltage embedded systems.

Key Specifications

Pinout & Package

TSZ124IQ4T is packaged in QFN16 3×3 mm with wettable flanks and an exposed thermal pad (EP) electrically connected to VCC−. Pin 1 is marked by a dot; the EP may be soldered to VCC− or left floating per layout requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2333PDR and MCP6V84-E/SL, TSZ124IQ4T uniquely balances quad integration, 40 µA/channel ultra-low power, and 5 µV offset in a 3×3 mm QFN - making it optimal for space- and energy-constrained multi-sensor nodes where DC precision dominates over speed.

Availability

TSZ124IQ4T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, and industrial signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TSZ124IQ4T 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, specializing in analog, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The TSZ12x series belongs to ST's precision analog portfolio, designed specifically for ultra-low-offset, micropower signal conditioning in resource-constrained, high-reliability applications such as implantables and portable diagnostics.

FAQ

What is the maximum capacitive load the TSZ124IQ4T can drive stably?

The TSZ124IQ4T is characterized for stable operation with up to 100 pF capacitive load across all supply voltages (1.8–5.5 V) and temperatures (−40 to 125 °C), maintaining ≥53° phase margin. Driving >100 pF requires external isolation resistor (e.g., 10–50 Ω) between output and load to prevent peaking or oscillation, as confirmed in Figure 29 of DS9216 Rev 11.

Does the exposed pad on the QFN16 package require a specific PCB connection?

Yes - the exposed thermal pad (EP) on TSZ124IQ4T's QFN16 3×3 mm package is internally connected to VCC−. ST recommends soldering the EP to a dedicated VCC− copper pour with ≥4 thermal vias (0.3 mm diameter) to inner ground/power planes to ensure thermal resistance ≤39 °C/W and reliable operation at 125 °C ambient, per Table 1 Rthja values.

How does the chopper frequency affect system-level EMI design?

The internal 400 kHz chopper clock generates low-amplitude, narrowband emissions centered at 400 kHz and harmonics. Layout best practices include placing the device away from sensitive RF sections (e.g., BLE antennas), using local 100 nF + 1 µF decoupling at VCC+, and avoiding routing high-impedance traces near the device - as validated by its 84–91 dB EMI rejection (Table 5 EMIRR) against 400–2400 MHz interferers.

Can TSZ124IQ4T operate with a 1.5 V supply?

No - the absolute maximum rating specifies minimum supply voltage of 1.8 V (Table 1), and all electrical characteristics (including 5 µV offset and 400 kHz GBW) are guaranteed only from 1.8 V to 5.5 V. Operation below 1.8 V risks undefined behavior, increased offset, and potential failure to meet rail-to-rail output swing specifications, as confirmed in Table 2 operating conditions.