STMicroelectronics TS4061BILT-1.25

Overview

TS4061BILT-1.25 from STMicroelectronics is a precision micropower shunt voltage reference with fixed 1.25 V output, ±0.2% initial accuracy at 25 °C, ultra-low 10 µA operating current, 35 ppm/°C max temperature coefficient, and stable operation with capacitive loads - used in high-resolution ADC biasing and portable sensor signal conditioning.

For engineers reviewing the TS4061BILT-1.25 datasheet, TS4061BILT-1.25 pinout, TS4061BILT-1.25 application, or TS4061BILT-1.25 equivalent, key selection criteria include low-current regulation capability (Ikmin = 10 µA), low-frequency noise (10 µVp-p), thermal hysteresis (120 ppm), and SOT23-3L package compatibility for space-constrained PCB layouts.

Technical Context

The TS4061BILT-1.25 operates as a two-terminal shunt reference, sinking current to maintain a precise 1.25 V cathode-to-anode voltage. Its bandgap-derived core achieves ±0.2% initial tolerance and 20–35 ppm/°C tempco over –40 to +85 °C, with static impedance of 0.15–0.3 Ω across 10 µA–10 mA.

It delivers 10 µVp-p low-frequency noise (0.1–10 Hz) and 95 µVRMS wideband noise (10 Hz–10 kHz), enabling use in 16-bit+ data acquisition systems. Stability with capacitive loads eliminates need for series isolation resistors in most configurations.

Key Specifications

Pinout & Package

TS4061BILT-1.25 is housed in a RoHS-compliant SOT23-3L package (3-pin, 2.8 × 2.1 mm footprint), with pin 1 = Anode, pin 2 = Cathode, pin 3 = 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 ADR3412ARJZ-R7, the TS4061BILT-1.25 uniquely combines 1.25 V output, ±0.2% accuracy, 10 µA regulation current, and shunt topology - making it optimal for space- and power-constrained applications where direct cathode referencing is required.

Availability

TS4061BILT-1.25 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and smart utility meters requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for TS4061BILT-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 analog, MCU, power, and sensing solutions 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 battery-operated and space-constrained instrumentation systems.

FAQ

What is the minimum cathode current required for regulation at –40 °C?

The TS4061BILT-1.25 requires 12 µA minimum cathode current (Ikmin) across –40 to +85 °C per Table 3. At –40 °C, this ensures stable 1.25 V output without dropout, unlike at 25 °C where 10 µA suffices. Designers must size the bias resistor accordingly using worst-case VCC and temperature derating.

Can Pin 3 (NC) be connected to ground or left floating?

Per ST's datasheet revision note, Pin 3 must be left unconnected or connected to the anode - never grounded or left floating. Connecting to ground creates an unintended current path that degrades accuracy and may cause thermal instability. Floating introduces noise susceptibility; tying to anode eliminates parasitic capacitance.

How does the TS4061BILT-1.25 compare to the TS4061AILT-1.25 in terms of long-term stability?

The TS4061BILT-1.25 (±0.2%) and TS4061AILT-1.25 (±0.1%) share identical long-term stability specs: both specify 120 ppm thermal hysteresis and same aging behavior (typ. 20 ppm/1000 hrs). The primary difference is initial accuracy - not drift - so long-term calibration intervals remain unchanged between grades.

Is the SOT23-3L package of TS4061BILT-1.25 compatible with automated optical inspection (AOI)?

Yes. The SOT23-3L package features defined solder pad geometry (per Figure 12), coplanar leads, and industry-standard 0.95 mm pitch - fully supported by AOI systems using 10–15 µm resolution cameras. ST's ECOPACK® compliance ensures consistent solder wetting and reflectivity for reliable defect detection during high-volume SMT assembly.