STMicroelectronics TSZ122IDT

Overview

TSZ122IDT from STMicroelectronics is a dual high-precision chopper-stabilized operational amplifier optimized for ultra-low offset and drift in battery-powered sensor interfaces. It delivers 5 µV max input offset voltage at 25 °C, 8 µV over –40 °C to 125 °C, rail-to-rail I/O, 400 kHz gain bandwidth, and 40 µA max supply current per amplifier at 5 V - enabling precision signal conditioning in portable medical devices and low-power instrumentation.

For engineers reviewing the TSZ122IDT datasheet, TSZ122IDT pinout, TSZ122IDT application, or TSZ122IDT equivalent, this page provides verified electrical specifications, package-specific terminal mapping (DFN8 2x2), real-world use cases in medical sensing and battery monitoring, and validated alternative options with documented functional trade-offs.

Technical Context

The TSZ122IDT employs a 400 kHz chopper clock to continuously correct input offset and eliminate 1/f noise - achieving near-zero drift without external calibration. Its CMOS input stage ensures ultra-low input bias current (≤300 pA over temperature) and high common-mode rejection (110–136 dB).

It operates from 1.8 V to 5.5 V, supports rail-to-rail output swing within 30 mV of rails, and maintains stable phase margin (≥53°) across supply voltages and temperatures - making it suitable for single-supply, low-voltage closed-loop sensor amplification where DC accuracy and long-term stability are critical.

Key Specifications

Pinout & Package

TSZ122IDT is packaged in DFN8 2x2 mm, 0.5 mm pitch, with exposed thermal pad (EP) electrically isolated and recommended to be connected to VCC– for optimal thermal performance and noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2333AIDR and MCP6V82-E/SN, TSZ122IDT uniquely balances ultra-low offset drift (10–30 nV/°C), industry-leading EMI rejection (91 dB @ 2.4 GHz), and DFN8 space efficiency - making it optimal for compact, calibrated medical and industrial sensors operating in electrically noisy, thermally variable environments.

Availability

TSZ122IDT is available at Aetrix Electronics and suitable for battery-powered medical devices, portable environmental sensors, precision instrumentation, and industrial condition monitoring systems requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for TSZ122IDT 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 specializing in intelligent power, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer applications.

TSZ122IDT belongs to the TSZ12x zero-drift precision op-amp family, designed specifically for high-accuracy, low-power signal conditioning in resource-constrained portable and medical electronics where calibration-free operation is mandatory.

FAQ

What is the maximum capacitive load the TSZ122IDT can drive without instability?

The TSZ122IDT remains stable with up to 100 pF capacitive load when configured as a unity-gain buffer, as confirmed by phase margin ≥53° in datasheet Figure 22. For loads exceeding 100 pF, a series resistor (≥100 Ω) must be added between output and capacitor to maintain stability - critical for driving long PCB traces or ADC input capacitance in portable data loggers.

Does the exposed pad on the DFN8 package require a specific PCB layout treatment?

Yes - the exposed pad (EP) of the TSZ122IDT DFN8 package must be soldered to a dedicated copper pour connected to VCC– (ground) via ≥4 thermal vias (0.3 mm diameter). This achieves the specified 57 °C/W thermal resistance and prevents localized heating that could induce offset drift in precision measurement paths.

Can TSZ122IDT operate reliably at 1.8 V supply with rail-to-rail output swing?

Yes - the TSZ122IDT guarantees rail-to-rail output swing within 30 mV of both rails at 1.8 V supply and 25 °C, and within 70 mV over the full –40 °C to 125 °C range. This enables direct interfacing with 1.8 V logic ADCs and low-voltage microcontrollers without level-shifting circuitry.

How does the chopper architecture affect signal integrity for AC-coupled sensor inputs?

The 400 kHz chopper clock introduces deterministic switching artifacts at harmonics of 400 kHz, visible as small spikes in the output spectrum. For AC-coupled inputs above 10 kHz, these artifacts are suppressed by the amplifier's 400 kHz GBP and do not impact SNR - but for DC or sub-10 Hz signals, proper output filtering (e.g., 10 kHz RC) is required to attenuate residual chopper ripple.