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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

STMicroelectronics TS4061AICT-1.25

Name: TS4061AICT-1.25
Brand: STMicroelectronics
SKU: TS4061AICT-1.25
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS4061AICT-1.25

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: SC-70, SOT-323

Datasheet:: TS4061AICT-1.25.pdf

Description:: IC VREF SHUNT 0.1% SOT323

Quantity:: RFQ Add To RFQ list

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Inventory:2,451

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Product details

Overview

TS4061AICT-1.25 from STMicroelectronics is a precision micropower shunt voltage reference with fixed 1.25 V output, ±0.1% initial accuracy at 25 °C, ultra-low 10 µA operating current, 35 ppm/°C max temperature coefficient, and low 10 µV_p-p LF noise. It operates across –40 to +85 °C and is used in high-accuracy analog signal conditioning stages of portable data loggers.

For engineers reviewing the TS4061AICT-1.25 datasheet, TS4061AICT-1.25 pinout, TS4061AICT-1.25 application, or TS4061AICT-1.25 equivalent, key selection criteria include shunt reference stability under capacitive loads, thermal hysteresis (120 ppm), static impedance (0.15–0.3 Ω), and SOT323-3L footprint constraints for space-constrained PCBs.

Technical Context

The TS4061AICT-1.25 functions as a two-terminal shunt reference, sinking current to regulate voltage at its cathode terminal. Its operation requires an external current source and load resistor, with regulation established when cathode-to-anode voltage reaches 1.25 V within ±0.1% tolerance at 25 °C.

It delivers stable performance across industrial temperatures via internal curvature compensation, achieving ≤35 ppm/°C tempco and <1 mV voltage shift over 10 µA–1 mA operating current range. Thermal hysteresis is specified at 120 ppm, and it remains stable with capacitive loads up to 100 nF.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.25 V ±0.1% at 25 °C - defines absolute ADC reference accuracy in 12-bit+ systems
Operating Current	10 µA typical - enables >10-year battery life in coin-cell-powered sensors
Tempco	≤35 ppm/°C - limits drift to <1.05 mV over full –40 to +85 °C range
LF Noise	10 µV_p-p (0.1–10 Hz) - preserves SNR in precision instrumentation front-ends
Static Impedance	0.15–0.3 Ω - ensures minimal load-induced error in ratiometric sensor bridges
Thermal Hysteresis	120 ppm - constrains repeatability error after thermal cycling in field-deployed equipment

Pinout & Package

TS4061AICT-1.25 is housed in a SOT323-3L package (1.8 × 1.35 × 0.8 mm), optimized for ultra-compact PCB layouts. Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is NC (No Connect), which must remain unconnected or tied to Anode per datasheet guidance.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Reference return path	Connected to system ground or current-source return; defines reference node potential
Cathode (Pin 2)	Regulated output node	Voltage at this terminal is stabilized at 1.25 V; sinks all operating current
NC (Pin 3)	Unused terminal	Must be left floating or connected to Anode; no internal connection or function

Key Features

Feature	Design Value
Ultra-low quiescent current	10 µA enables direct use with high-value bias resistors (>1 MΩ) in energy-harvesting nodes
Capacitive-load stability	Stable with ≥100 nF bypass caps - eliminates need for series isolation resistors in noisy environments
Low thermal hysteresis	120 ppm ensures repeatable calibration after field temperature excursions in outdoor monitoring gear
High initial accuracy	±0.1% eliminates post-manufacturing trimming in medical-grade analog front-ends

Applications

Portable Gas Sensors

Data Acquisition Modules

Use Scenario: Battery-powered CO₂ sensor with electrochemical transducer requiring stable 1.25 V reference for 16-bit delta-sigma ADC.

IC Role / Device Role / Timing Role: Shunt reference providing ratiometric excitation and ADC reference in single-supply 3.3 V system.

Use Value: 10 µA current draw extends 200 mAh coin cell life beyond 5 years; 35 ppm/°C tempco maintains <0.5% full-scale error across outdoor temperature swings.

Use Scenario: Industrial 8-channel thermocouple logger with cold-junction compensation and isolated SPI interface.

IC Role / Device Role / Timing Role: Precision voltage reference for analog front-end PGA and ADC reference buffer stage.

Use Value: 10 µV_p-p low-frequency noise prevents baseline drift in µV-level thermocouple signals; SOT323-3L saves board area in multi-channel stacked PCB design.

Medical Wearables

Smart Meter Analog Front-End

Use Scenario: ECG patch with ultra-low-power MCU and 12-bit SAR ADC sampling biopotentials at 250 SPS.

IC Role / Device Role / Timing Role: Low-noise shunt reference for ADC and op-amp biasing in rail-to-rail input stage.

Use Value: 0.15–0.3 Ω static impedance minimizes gain error in high-impedance electrode interfaces; ±0.1% accuracy supports IEC 60601-2-47 compliance.

Use Scenario: Three-phase electricity meter using metrology SoC with integrated 24-bit sigma-delta ADC.

IC Role / Device Role / Timing Role: Primary reference for current-sense amplifier offset calibration and ADC reference scaling.

Use Value: Stable regulation under 100 nF ceramic decoupling ensures immunity to switching noise from DC-DC converters; -40 to +85 °C rating supports outdoor meter enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431ACDBVR	Adjustable (2.5 V min), ±0.5% initial accuracy, 80 µA typical IQ	Requires external resistor divider; higher current increases power in battery systems	Choose when adjustable output or tighter tempco (30 ppm/°C) is needed despite lower accuracy
REF3012AIDBZR	Series reference, 1.2 V output, ±0.2% accuracy, 50 µA IQ, SO-6 package	Three-terminal architecture requires separate input/output pins; larger footprint	Prefer when supply headroom allows series topology and lower noise (3.9 µV_RMS) is critical

Compared with TLVH431ACDBVR and REF3012AIDBZR, TS4061AICT-1.25 offers the lowest operating current and smallest footprint among 1.25 V references, making it optimal for space- and energy-constrained shunt configurations where fixed output suffices.

Availability

TS4061AICT-1.25 is available at Aetrix Electronics and suitable for portable gas sensors, data acquisition modules, medical wearables, and smart meter analog front-ends requiring stable component supply with guaranteed long-term continuity.

Supply support for TS4061AICT-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 ICs, sensors, and analog components 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 operating current required for regulation?

The TS4061AICT-1.25 requires a minimum operating current of 10 µA at 25 °C and 12 µA across the full –40 to +85 °C range to maintain regulation. Below this threshold, the cathode voltage drops below 1.25 V, causing loss of reference accuracy and increased output impedance.

Can TS4061AICT-1.25 drive a 100 nF capacitive load directly?

Yes - the device is explicitly characterized and guaranteed stable with up to 100 nF capacitive loads, as confirmed by startup waveform testing in the datasheet (Figure 9). No series isolation resistor is required, simplifying layout and reducing component count in noise-sensitive applications.

Is Pin 3 (NC) electrically connected internally?

No - Pin 3 is a true no-connect terminal with no internal bond wire or silicon connection. The datasheet mandates it be left unconnected or tied to the Anode (Pin 1); connecting it elsewhere may compromise thermal performance or cause undefined behavior due to parasitic coupling.

How does thermal hysteresis affect calibration repeatability?

Thermal hysteresis is measured as 120 ppm - the voltage difference observed at 25 °C after cycling to –40 °C versus after cycling to +85 °C. This translates to ~0.15 mV deviation, directly impacting recalibration intervals in field-deployed instruments where ambient temperature swings occur repeatedly.

TS4061AICT-1.25 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: SC-70, SOT-323

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 1.25V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±0.1%

Temperature Coefficient:: 35ppm/°C

Noise - 0.1Hz to 10Hz:: 10µVp-p

Noise - 10Hz to 10kHz:: 95µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 12 µA

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

TS4061AICT-1.25 FAQ

1.How can I place an order for TS4061AICT-1.25 through Aetrix?

Please submit a Request for Quotation (RFQ) for TS4061AICT-1.25 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TS4061AICT-1.25 reliable?

The price and inventory of TS4061AICT-1.25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS4061AICT-1.25 is usually 5 days.

3.What payment methods are accepted for TS4061AICT-1.25?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS4061AICT-1.25 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS4061AICT-1.25?

TS4061AICT-1.25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS4061AICT-1.25 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TS4061AICT-1.25?

For technical support, including TS4061AICT-1.25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS4061AICT-1.25 requirements.

6.How does Aetrix verify that TS4061AICT-1.25 is sourced from the original manufacturer or authorized distributors?

All TS4061AICT-1.25 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TS4061AICT-1.25 meets industry standards.

7.What is the process for return or replacement of TS4061AICT-1.25?

All TS4061AICT-1.25 units undergo pre-shipment inspection (PSI). If there is an issue with TS4061AICT-1.25, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TS4061AICT-1.25 part is unused and in its original packaging.

Return procedure for TS4061AICT-1.25:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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