STMicroelectronics TS4061AILT-1.25

Overview

TS4061AILT-1.25 from STMicroelectronics is a precision micropower shunt voltage reference delivering a fixed 1.25 V output with ±0.1% initial accuracy, 35 ppm/°C max temperature coefficient, and ultra-low 10 µA operating current at 25 °C. It operates across –40 to +85 °C and supports stable regulation with capacitive loads in space-constrained portable instrumentation.

For engineers reviewing the TS4061AILT-1.25 datasheet, TS4061AILT-1.25 pinout, TS4061AILT-1.25 application, or TS4061AILT-1.25 equivalent, key selection criteria include initial voltage tolerance, thermal drift performance, minimum cathode current requirement (12 µA over full temperature range), low-frequency noise (10 µV_p-p), and SOT23-3L package compatibility with high-density PCB layouts.

Technical Context

The TS4061AILT-1.25 functions as a two-terminal shunt reference, sinking current through its cathode to maintain a precise 1.25 V across an external load/resistor network. Its internal bandgap core achieves ±0.1% accuracy at 25 °C and sustains regulation down to 12 µA cathode current across the industrial temperature range.

It exhibits very low dynamic impedance (0.15–0.3 Ω), minimal thermal hysteresis (120 ppm), and low-frequency noise of 10 µV_p-p (0.1–10 Hz), enabling high-resolution ADC biasing and precision sensor excitation without external filtering.

Key Specifications

Pinout & Package

TS4061AILT-1.25 is housed in a 3-pin SOT23-3L package (JEDEC TO-236AB). Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is NC (No Connect) - must be left unconnected or tied to Anode per ST specification.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt voltage reference applications.

Compared with TLVH431ACDBVR and REF3012AIDBZR, TS4061AILT-1.25 delivers superior initial accuracy (±0.1%), lowest operating current (10 µA), and exact 1.25 V output-making it optimal for fixed-voltage, ultra-low-power, high-precision applications where board space and battery longevity are critical.

Availability

TS4061AILT-1.25 is available at Aetrix Electronics and suitable for portable instrumentation, battery-operated data acquisition systems, and industrial process transmitters requiring stable component supply and long-term lifecycle support.

Supply support for TS4061AILT-1.25 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, power management ICs, analog components, and MEMS sensors for industrial, automotive, and consumer markets.

The TS4061 belongs to ST's precision analog reference product line, engineered specifically for ultra-low-power, high-accuracy voltage referencing in space- and energy-constrained applications such as portable medical devices and wireless sensor nodes.

FAQ

What is the minimum cathode current required for regulation across temperature?

The TS4061AILT-1.25 requires a minimum cathode current of 12 µA over the full –40 to +85 °C operating range to guarantee regulation. At 25 °C, regulation begins at 7.5 µA, but design must accommodate the 12 µA worst-case requirement to ensure stability in extreme environments.

Can TS4061AILT-1.25 drive a 100 nF capacitor directly?

Yes-TS4061AILT-1.25 is explicitly characterized for stability with capacitive loads up to 100 nF, as confirmed by startup waveform testing in the official datasheet (Figure 9). No series resistor or external compensation is needed, simplifying layout in compact sensor modules.

Is Pin 3 (NC) electrically isolated or internally connected?

Pin 3 is a true no-connect terminal with no internal connection. ST's datasheet states it "must be left unconnected or connected to anode"-this reflects mechanical pin assignment only; tying it to anode has no electrical effect and is permitted solely for mechanical anchoring or thermal relief.

How does thermal hysteresis affect calibration repeatability?

Thermal hysteresis is specified at 120 ppm, meaning voltage may shift up to 150 µV between measurements taken after cycling from –40 °C and +85 °C back to 25 °C. This impacts multi-temperature calibration routines in portable test equipment, requiring hysteresis-aware correction algorithms or single-point calibration at nominal temperature.