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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

STMicroelectronics TSU101ILT

Name: TSU101ILT
Brand: STMicroelectronics
SKU: TSU101ILT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TSU101ILT

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: SC-74A, SOT-753

Datasheet:: TSU101ILT.pdf

Description:: IC OPAMP GP 1 CIRCUIT SOT23-5

Quantity:: RFQ Add To RFQ list

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Inventory:2,013

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Product details

Overview

TSU101ILT from STMicroelectronics is a single-channel nanopower rail-to-rail input/output operational amplifier optimized for ultra-low-energy sensor signal conditioning. It delivers 580 nA typical supply current at 1.8 V, 8 kHz gain bandwidth, 2 pA max input bias current, and operates from 1.5 V to 5.5 V across –40 °C to +85 °C - enabling direct use with coin-cell batteries in PIR motion detectors and electrochemical gas sensors.

For engineers reviewing the TSU101ILT datasheet, TSU101ILT pinout, TSU101ILT application, or TSU101ILT equivalent, this page provides verified pin functions, real-world sensor interface design values, confirmed alternative op-amps with documented offset and bandwidth trade-offs, and supply-chain support for long-life battery-powered deployments.

Technical Context

The TSU101ILT uses complementary PMOS/NMOS input stages to achieve true rail-to-rail input operation (V_ICM = V_CC– – 0.1 V to V_CC+ + 0.1 V) without phase reversal, while maintaining unity-gain stability into 60 pF capacitive loads. Its 8 kHz GBP and 3 V/ms slew rate are calibrated for low-frequency precision amplification - not high-speed signal processing.

DC performance is characterized at three supply voltages (1.8 V, 3.3 V, 5 V), with input offset voltage tightly distributed (±3.4 mV over temperature) and long-term drift specified as 0.18 µV/√month at 25 °C - critical for unattended medical or environmental monitoring systems requiring decade-scale calibration stability.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Current	580 nA typ. at 1.8 V - enables >42-year coin-cell lifetime in always-on sensor nodes
Gain Bandwidth Product	8 kHz typ. - sufficient for DC–100 Hz sensor signals (e.g., PIR, pH, O₂) with stable closed-loop gain
Input Bias Current	2 pA max at 25 °C - preserves signal integrity from high-impedance sources (>1 GΩ) like photodiodes or reference electrodes
Rail-to-Rail I/O	Input range extends 0.1 V beyond rails; output swings within 40 mV of rails - maximizes dynamic range in low-voltage systems
Operating Voltage	1.5 V to 5.5 V - supports direct connection to Li-MnO₂ coin cells (2.0–3.3 V) and regulated 3.3 V/5 V rails
Temperature Range	–40 °C to +85 °C - qualified for industrial and outdoor metering applications without derating
Input Offset Drift	5 µV/°C max - limits thermal error to <175 µV over full industrial range, easing system-level compensation

Pinout & Package

TSU101ILT is housed in a 5-pin SOT23-5 package (ECOPACK2 compliant), with pin 1 marked by a dot or bevelled edge. The layout supports compact PCB placement and standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
1 (V_CC+)	Positive supply rail	Accepts 1.5–5.5 V; decoupling capacitor (100 nF) required within 2 mm for noise immunity
2 (IN+)	Non-inverting input	High-impedance node (Z_in > 10¹² Ω); sensitive to EMI - guard ring recommended
3 (OUT)	Amplifier output	Capable of ±5 mA drive; stable with ≤60 pF load - external R_iso needed for larger capacitance
4 (V_CC–)	Negative supply rail / ground	Must be connected directly to PCB ground plane; shared return path affects PSRR
5 (IN–)	Inverting input	Used for feedback networks; matched to IN+ in offset and bias current for precision configurations

Key Features

Feature	Design Value
Ultra-low quiescent current	580 nA typ. at 1.8 V - reduces self-heating and extends battery life beyond 40 years in sleep-mode sensor nodes
Rail-to-rail input stage	Operates with inputs 0.1 V beyond supply rails - eliminates level-shifting circuitry for single-supply sensor interfaces
No phase reversal	Guaranteed under all common-mode conditions - prevents latch-up or erroneous output during power-up or rail transients
EMI robustness	73–88 dB EMIRR at 400 MHz–2.4 GHz - maintains accuracy in RF-dense environments (e.g., smart meters near cellular modules)
Low-frequency noise	8.1 µV_PP (0.1–10 Hz) - minimizes baseline drift in DC-coupled medical instrumentation and gas sensor baselines

Applications

Pyroelectric PIR Detection

Battery Current Sensing

Use Scenario: Passive infrared motion detector in wireless security nodes powered by CR2032 coin cell.

IC Role / Device Role / Timing Role: Amplifies microvolt-level pyroelectric sensor output with minimal added noise and zero standby drain.

Use Value: Enables >10-year battery life while preserving detection sensitivity down to 10 µV_PP signals at 0.1–10 Hz.

Use Scenario: High-side current monitor in portable medical infusion pump with 10-year service interval.

IC Role / Device Role / Timing Role: Configured as transimpedance amplifier for shunt resistor feedback, rejecting common-mode voltage up to 5.5 V.

Use Value: Achieves ±0.5% current measurement accuracy over temperature with <1 µA total circuit current.

Electrochemical Gas Sensor

UV and Photo Sensor Interface

Use Scenario: CO sensor module in industrial air quality monitor operating continuously on 3.3 V regulated rail.

IC Role / Device Role / Timing Role: Low-bias-current buffer for working electrode potential control and current-to-voltage conversion.

Use Value: Maintains <2 pA input error current, ensuring sub-ppm gas concentration resolution without active calibration.

Use Scenario: UV index sensor in solar-powered environmental logger using SiC photodiode.

IC Role / Device Role / Timing Role: Transimpedance amplifier with 10¹² Ω feedback resistor, leveraging rail-to-rail output to maximize ADC utilization.

Use Value: Delivers 265 nV/√Hz input noise at 100 Hz, enabling reliable UV-A/B discrimination below 10 nW/cm².

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSU111ILT	Lower V_OS (150 µV max), higher ICC (900 nA), same GBP (8 kHz)	Better DC accuracy but 55% higher current - unsuitable for >15-year coin-cell life targets	Select when offset-limited precision outweighs battery life; verify thermal drift impact on calibration interval
LTC1540CS5#TRMPBF	Higher V_OS (1.5 mV), lower ICC (600 nA), no rail-to-rail input	Requires input biasing network; limited common-mode range restricts single-supply sensor use	Choose only if existing design uses non-rail I/O topology and can tolerate 5× higher offset error

Compared with TSU101ILT, TSU111ILT trades current efficiency for offset accuracy - making it viable for shorter-life, higher-precision instruments; LTC1540 requires external level-shifting and offers no rail-to-rail advantage, limiting its utility in modern ultra-low-voltage sensor nodes.

Availability

TSU101ILT is available at Aetrix Electronics and suitable for ultra-long-life battery-powered applications, electrochemical sensor interfaces, and industrial PIR detection systems requiring stable component supply across multi-year production cycles.

Supply support for TSU101ILT 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, specializing in analog, microcontrollers, and power devices for industrial, automotive, and consumer markets.

The TSU10x series belongs to ST's nanopower precision op-amp product line, designed specifically for energy-constrained sensor signal chains where decades-long battery life and rail-to-rail operation are mandatory - not optional.

FAQ

What is the maximum capacitive load the TSU101ILT can drive without instability?

The TSU101ILT remains unity-gain stable with up to 60 pF capacitive load at the output, as verified in the datasheet's phase margin vs. capacitive load plot (Figure 25). For loads exceeding 60 pF, a series isolation resistor (R_iso) of 10–100 Ω is required - values are tabulated in Figure 31 based on load capacitance and supply voltage.

Can the TSU101ILT operate from a 1.2 V supply?

No. The absolute minimum supply voltage is 1.5 V per the Absolute Maximum Ratings table (Table 1), and all electrical characteristics are guaranteed only from 1.5 V to 5.5 V. Operation below 1.5 V risks undefined behavior, including failure to power up or loss of rail-to-rail input functionality.

How does the input bias current change with common-mode voltage?

Input bias current varies significantly with common-mode voltage: at V_CC = 3.3 V, it ranges from ~0.03 pA at mid-rail (1.65 V) to ~10 pA near the rails (0 V or 3.3 V), as shown in Figures 9–11. This behavior stems from the complementary input pair architecture and must be accounted for in high-impedance feedback networks.

Is the TSU101ILT suitable for driving ADC reference inputs?

Yes - its 40 mV output swing limitation near rails and low output impedance (<1 Ω at DC) make it well-suited for buffering precision ADC references. However, ensure the reference load capacitance stays ≤60 pF or add R_iso; also verify that the 8 kHz GBP provides adequate settling for the ADC's acquisition time at target sampling rates.

TSU101ILT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: SC-74A, SOT-753

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: General Purpose

Number of Circuits:: 1

Output Type:: Rail-to-Rail

Slew Rate:: 0.003V/µs

Gain Bandwidth Product:: 9 kHz

-3db Bandwidth:: -

Current - Input Bias:: 5 pA

Voltage - Input Offset:: 3 mV

Current - Supply:: 650nA

Current - Output / Channel:: 11 mA

Voltage - Supply Span (Min):: 1.5 V

Voltage - Supply Span (Max):: 5.5 V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

TSU101ILT FAQ

1.How can I place an order for TSU101ILT through Aetrix?

Please submit a Request for Quotation (RFQ) for TSU101ILT 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 TSU101ILT reliable?

The price and inventory of TSU101ILT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSU101ILT is usually 5 days.

3.What payment methods are accepted for TSU101ILT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSU101ILT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TSU101ILT?

TSU101ILT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TSU101ILT 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 TSU101ILT?

For technical support, including TSU101ILT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSU101ILT requirements.

6.How does Aetrix verify that TSU101ILT is sourced from the original manufacturer or authorized distributors?

All TSU101ILT 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 TSU101ILT meets industry standards.

7.What is the process for return or replacement of TSU101ILT?

All TSU101ILT units undergo pre-shipment inspection (PSI). If there is an issue with TSU101ILT, 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 TSU101ILT part is unused and in its original packaging.

Return procedure for TSU101ILT:

1.Submit a request within 90 days.

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

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