STMicroelectronics TSZ124IPT

Overview

TSZ124IPT from STMicroelectronics is a quad-channel, rail-to-rail input/output precision operational amplifier featuring chopper-stabilized architecture for zero-drift performance. It delivers 5 µV max input offset voltage at 25 °C, 400 kHz gain bandwidth, 1.8–5.5 V supply range, and 40 µA max supply current per amplifier-enabling high-accuracy signal conditioning in ultra-low-power battery-powered medical sensors and portable instrumentation.

For engineers reviewing the TSZ124IPT datasheet, TSZ124IPT pinout, TSZ124IPT application, or TSZ124IPT equivalent, this page provides verified electrical specifications, package-specific terminal mapping (QFN16 3×3), real-world use cases in sensor front-ends and portable diagnostics, and validated alternative options with documented functional trade-offs.

Technical Context

The TSZ124IPT implements a 400 kHz chopper-stabilized architecture with dual-phase modulation (Chop1/Chop2) synchronized to a 400 kHz internal clock, enabling continuous correction of input offset voltage and 1/f noise across temperature. Its CMOS input stage achieves ultra-low input bias current (≤300 pA over –40 to 125 °C) and rail-to-rail common-mode input range (V_CC– – 0.1 V to V_CC+ + 0.1 V).

It maintains stable phase margin (≥53°) and low output impedance (<2 kΩ up to 100 kHz) across 1.8–5.5 V supply, while supporting EMI rejection up to 91 dB at 2.4 GHz and 120 dB supply voltage rejection ratio (SVR) at 5 V-critical for noisy mixed-signal environments in portable medical devices.

Key Specifications

Pinout & Package

TSZ124IPT is packaged in a thermally enhanced QFN16 3×3 mm exposed-pad package (pitch: 0.5 mm). The exposed pad must be soldered to PCB ground plane for optimal thermal performance (R_thJA = 39 °C/W) and EMI immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2333PWR and MCP6V84-E/SL, TSZ124IPT offers the lowest guaranteed offset (5 µV) and best drift (10 nV/°C typ.) in its class, making it optimal for highest-accuracy, lowest-power portable medical and industrial measurement where calibration is impractical.

Availability

TSZ124IPT is available at Aetrix Electronics and suitable for portable medical diagnostics, battery-powered environmental sensors, low-power industrial transmitters, and wearable health monitoring systems requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for TSZ124IPT 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 microcontrollers, analog ICs, power management, and MEMS sensors for industrial, automotive, and consumer markets.

The TSZ12x series belongs to ST's precision analog portfolio, engineered specifically for ultra-low-offset, zero-drift signal conditioning in energy-constrained, high-reliability applications such as portable medical devices and industrial IoT endpoints.

FAQ

What is the maximum capacitive load the TSZ124IPT can drive stably?

TSZ124IPT maintains stability with up to 100 pF capacitive load when driving a 10 kΩ resistive load, as confirmed by phase margin ≥53° in datasheet Figure 22. For loads >100 pF, external isolation resistor (≥100 Ω) between output and capacitance is required to prevent peaking or oscillation.

Does the QFN16 package require special PCB layout considerations?

Yes-the exposed pad must be soldered to a solid thermal GND plane using ≥4 thermal vias (0.3 mm diameter) to achieve R_thJA = 39 °C/W and meet EMI immunity specs. Signal traces should avoid the pad area, and V_CC+/V_CC– decoupling (100 nF X7R) must be placed within 2 mm of pins 10 and 16.

Can TSZ124IPT operate from a 1.8 V supply while maintaining rail-to-rail output swing?

Yes-datasheet Table 3 confirms VOH ≤70 mV and VOL ≤70 mV at 1.8 V supply and –40 to 125 °C, delivering >96% of full-scale swing. Output current capability is reduced (±7 mA typ.), but sufficient for driving 10 kΩ ADC inputs or low-power comparators.

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

The internal 400 kHz chopper clock generates low-amplitude harmonics up to ~2 MHz. Layout best practices include avoiding sensitive analog traces near the device, using ground guard rings around inputs, and filtering V_CC+ with ferrite bead + 100 nF capacitor to suppress conducted emissions into shared power rails.