STMicroelectronics TSU104IPT

Overview

TSU104IPT from STMicroelectronics is a quad nanopower rail-to-rail input/output operational amplifier optimized for ultra-low-power sensor signal conditioning. It delivers 580 nA typical supply current per channel at 1.8 V, 8 kHz gain bandwidth, ±2 pA max input bias current, and operates across 1.5 V–5.5 V supply with –40 °C to 85 °C industrial temperature range-enabling multi-year operation on coin-cell batteries in PIR motion detectors and electrochemical gas sensors.

For engineers reviewing the TSU104IPT datasheet, TSU104IPT pinout, TSU104IPT application, or TSU104IPT equivalent, this page provides verified pin mapping for QFN16 3×3 and TSSOP14 packages, confirmed rail-to-rail I/O behavior, real-world noise performance (240 nV/√Hz @ 1 kHz, 5 V), long-term offset drift (1.1 µV/√month), and validated alternatives for battery-constrained analog front-ends.

Technical Context

The TSU104 implements dual complementary PMOS/NMOS input stages enabling true rail-to-rail common-mode input range (VCC− −0.1 V to VCC+ +0.1 V) without phase reversal-a critical feature for high-impedance sensor interfaces where input signals approach supply rails. Its 8 kHz GBP and 3 V/ms slew rate support stable DC-coupled amplification of slow-varying sensor outputs such as pyroelectric or UV photodiode currents.

Designed for single-supply operation, it features unity-gain stability with capacitive loads up to 200 pF (verified via phase margin ≥60°), low-frequency noise of 8.1 µVpp (0.1–10 Hz), and electromagnetic interference rejection ratio (EMIRR) exceeding 73 dB at 400 MHz-making it suitable for mixed-signal environments near RF transceivers or switching regulators.

Key Specifications

Pinout & Package

TSU104IPT is available in two RoHS-compliant packages: QFN16 3×3 mm (exposed pad) and TSSOP14. Both are surface-mount, lead-free, and rated for industrial temperature operation. Pin functions are identical across packages; QFN16 offers lower thermal resistance (45 °C/W) for extended ambient operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSU104IPT, TSU114IDT improves bandwidth and offset at the cost of doubled supply current, while LTC2063IS6#TRMPBF delivers microvolt-level drift stability but sacrifices battery longevity and increases BOM cost-making TSU104IPT optimal for cost-sensitive, ultra-low-power sensor nodes where 3.4 mV offset and 8 kHz GBP are sufficient.

Availability

TSU104IPT is available at Aetrix Electronics and suitable for ultra-long-life battery-powered applications, electrochemical gas sensing, and medical wearable instrumentation requiring stable component supply across extended production cycles.

Supply support for TSU104IPT 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.

The TSU10x series belongs to ST's nanopower precision op-amp product line, engineered specifically for energy-harvesting and battery-operated sensor interfaces where sub-microamp quiescent current and rail-to-rail operation are non-negotiable design requirements.

FAQ

What is the maximum capacitive load the TSU104IPT can drive while maintaining stability?

The TSU104IPT remains unity-gain stable with capacitive loads up to 200 pF when configured as a follower, as confirmed by phase margin ≥60° across –40 °C to 85 °C and 1.5–5.5 V supply. For loads >100 pF, ST recommends adding a series isolation resistor (Riso) of 10–100 Ω between output and capacitance to suppress peaking-values derived from Figure 31 in DS9507 Rev 4.

Does TSU104IPT support true single-supply operation with input signals at ground?

Yes. Its rail-to-rail input stage allows common-mode voltage from VCC− −0.1 V to VCC+ +0.1 V. With VCC− = GND, inputs function correctly down to –0.1 V, enabling direct interface to grounded sensors (e.g., thermistors, bridge outputs) without level-shifting circuitry-verified in Table 2 and Section 5.2 of DS9507.

How does the input bias current vary with temperature and common-mode voltage?

At 25 °C and mid-rail VICM, Iib is ≤2 pA max; it rises to ≤30 pA at 85 °C and low/high VICM extremes (Figures 9–11). This variation is process-controlled and documented across all operating conditions-no derating is required for industrial temperature designs, as worst-case 30 pA still enables >33 MΩ effective source impedance before 1% gain error.

Can TSU104IPT be used in a transimpedance amplifier (TIA) configuration for photodiode sensing?

Yes. Its 2 pA max input bias current, 8 kHz GBP, and unity-gain stability make it suitable for low-speed TIA applications (e.g., UV or IR photodiodes with 100 kΩ–10 MΩ feedback resistors). Layout best practices include guarding the inverting input and minimizing stray capacitance-design guidance is provided in Application Note AN5029 for nanopower TIAs.