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

STMicroelectronics TSX631AILT

Name: TSX631AILT
Brand: STMicroelectronics
SKU: TSX631AILT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TSX631AILT

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: SC-74A, SOT-753

Datasheet:: TSX631AILT.pdf

Description:: IC OPAMP GP 1 CIRCUIT SOT23-5

Quantity:: RFQ Add To RFQ list

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Inventory:2,136

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Product details

Overview

TSX631AILT from STMicroelectronics is a micropower rail-to-rail input/output CMOS operational amplifier optimized for high-impedance sensor interfaces and industrial signal conditioning. It delivers 200 kHz gain bandwidth, 45 µA supply current at 16 V, ±500 µV max input offset voltage (A-grade), 3.3–16 V supply range, and operates across –40°C to +125°C for automotive-grade reliability.

For engineers reviewing the TSX631AILT datasheet, TSX631AILT pinout, TSX631AILT application, or TSX631AILT equivalent, key selection criteria include ultra-low quiescent current, rail-to-rail I/O swing at low supply voltages, A-grade offset voltage stability over temperature, and SOT23-5 packaging for space-constrained analog front-ends in battery-powered or harsh-environment systems.

Technical Context

This op-amp employs a CMOS input stage with 1 pA typical input bias current and 1 TΩ input resistance, enabling direct interfacing with piezoelectric, pH, and photodiode sensors. Its rail-to-rail input common-mode range extends from V_CC– – 0.1 V to V_CC+ + 0.1 V, and output swings within 70 mV of either rail under 10 kΩ load at 25°C.

The device features a 200 kHz gain-bandwidth product with 55° phase margin and 9 dB gain margin, supporting stable unity-gain follower and active filter configurations. It achieves 73–87 dB supply voltage rejection (SVR) and 65–85 dB common-mode rejection (CMR) across its full operating temperature and supply range.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3.3 V to 16 V - supports single-supply operation from Li-ion battery up to industrial 12 V rails.
Quiescent Current	45 µA typ / 60 µA max at 16 V - enables multi-year battery life in always-on sensor nodes.
Input Offset Voltage	±500 µV max (A-grade, 25°C) - ensures <1 LSB error in 12-bit ADC front-ends with gain ≤10.
Gain Bandwidth Product	200 kHz typ - sufficient for anti-aliasing filters, low-frequency instrumentation, and DC-coupled signal conditioning.
Input Bias Current	1 pA typ - preserves signal integrity when buffering high-impedance sources >100 MΩ.
Rail-to-Rail I/O	Input: V_CC– – 0.1 V to V_CC+ + 0.1 V; Output: within 70 mV of rails - maximizes dynamic range in low-voltage systems.
Operating Temperature	–40°C to +125°C - qualified for under-hood automotive and industrial control applications.

Pinout & Package

SOT23-5 package: 2.9 mm × 1.6 mm × 1.1 mm body, 0.95 mm pitch, surface-mount, thermally enhanced with exposed pad (not electrically connected).

Pin	Circuit Role	Design Meaning
1	Inverting Input (–)	Differential input node; high-impedance CMOS gate; requires matched trace impedance for noise immunity.
2	Non-inverting Input (+)	Differential input node; same high-Z characteristics as Pin 1; critical for precision biasing networks.
3	Output	Rail-to-rail capable; drives ≥10 kΩ load to within 70 mV of supply rails at 25°C.
4	V_CC– (GND)	Ground reference terminal; must be low-inductance connection to minimize PSRR degradation.
5	V_CC+	Positive supply input; accepts 3.3–16 V; decoupling capacitor (100 nF) required within 2 mm.

Key Features

Feature	Design Value
Ultra-low power consumption	60 µA max ICC at 16 V enables energy harvesting and coin-cell operation in remote sensors.
A-grade input offset voltage	±500 µV max at 25°C and ±1.5 mV over –40°C to +125°C reduces calibration overhead in precision measurement.
Rail-to-rail input and output	Full supply-range common-mode input and output swing preserves signal fidelity in single-supply 3.3 V systems.
High ESD tolerance	4 kV HBM, 1.3 kV CDM - robust against handling and board-level transients in automotive assembly lines.
Wide supply range	3.3 V to 16 V operation eliminates need for LDOs in mixed-voltage industrial subsystems.

Applications

Industrial Signal Conditioning

Automotive Sensor Interface

Use Scenario: Amplifying low-level signals from RTD, thermocouple, or strain gauge bridges in PLC analog input modules.

IC Role / Device Role / Timing Role: Precision buffer and gain stage in 24-bit ΣΔ ADC front-end with programmable gain.

Use Value: 1 pA input bias current prevents bridge imbalance errors; rail-to-rail output maximizes ADC utilization without level-shifting.

Use Scenario: Signal conditioning for exhaust gas oxygen (EGO) sensors and cabin air quality PM2.5 detectors.

IC Role / Device Role / Timing Role: Low-drift amplifier in closed-loop feedback path for Nernst cell bias control.

Use Value: ±500 µV A-grade offset ensures <±1% O₂ reading accuracy over lifetime; 125°C rating supports under-dash mounting.

Active Filtering

Medical Instrumentation

Use Scenario: 2nd-order Sallen-Key low-pass filter (10 Hz cutoff) for ECG electrode amplifiers.

IC Role / Device Role / Timing Role: Unity-gain stable filter stage with 200 kHz GBP and 55° phase margin.

Use Value: 5 µVpp low-frequency noise (0.1–10 Hz) preserves microvolt-level cardiac signals; 60 µA ICC minimizes heat in wearable enclosures.

Use Scenario: Front-end amplification for portable blood glucose meter photodiode current detection.

IC Role / Device Role / Timing Role: Transimpedance amplifier converting sub-nA photocurrent to voltage with minimal dark-current error.

Use Value: 1 pA input bias current avoids baseline shift; rail-to-rail output enables direct interface to 3.3 V SAR ADC without external bias.

Equivalent & Alternatives

The following parts are listed as comparable options for similar micropower rail-to-rail op-amp applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSX631IST	SOT23-5 package, identical electrical specs, non-A grade (1 mV V_io max), same temp range.	Cost-sensitive industrial controls where ±1 mV offset is acceptable.	Select when budget constraints outweigh precision requirements and AEC-Q100 qualification is not mandatory.
MCP6001T-E/OT	Microchip part; 1 µA I_ib, 100 kHz GBP, 100 nA I_CC, same SOT23-5 footprint but higher power and lower bandwidth.	General-purpose low-power sensing where 200 kHz bandwidth is not required.	Choose only if legacy design uses MCP6001 footprint and 100 kHz bandwidth suffices; not suitable for high-precision A-grade replacement.

Compared with TSX631AILT, TSX631IST trades A-grade offset for lower cost while maintaining identical packaging and temperature capability; MCP6001T-E/OT offers pin compatibility but sacrifices 2× bandwidth and 2× quiescent current, limiting use in high-accuracy, low-power designs.

Availability

TSX631AILT is available at Aetrix Electronics and suitable for industrial signal conditioning, automotive sensor interfaces, active filtering, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TSX631AILT 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 specializing in power management, analog, MEMS, and automotive ICs, with manufacturing and R&D facilities across Europe, Asia, and the Americas.

The TSX63x series was designed specifically for ultra-low-power, high-precision analog signal chains in harsh environments-targeting automotive sensor modules, industrial IoT nodes, and portable medical devices demanding AEC-Q100 compliance and rail-to-rail performance at micropower levels.

FAQ

What is the maximum capacitive load the TSX631AILT can drive without instability?

The TSX631AILT remains unity-gain stable with up to 100 pF capacitive load when using a 100 kΩ feedback resistor and proper PCB layout. For loads >100 pF, an isolation resistor (R_iso) of 10–100 Ω in series with the output is recommended-Figure 17 in the datasheet provides exact R_iso vs. C_load curves. Stability is confirmed across –40°C to +125°C.

Does the TSX631AILT support dual-supply operation?

Yes-the TSX631AILT operates with split supplies (e.g., ±5 V) as long as total supply voltage remains between 3.3 V and 16 V and both rails stay within absolute maximum ratings (V_CC+ – V_CC– ≤ 18 V). The common-mode input range extends to within 0.1 V of either rail, enabling true bipolar signal handling in dual-supply configurations.

How does the input offset voltage drift over temperature affect system calibration?

The TSX631AILT exhibits ΔV_io/ΔT of 1–8 µV/°C (typ/max), meaning worst-case drift is ±0.9 mV over a 125°C span. This allows one-time factory calibration in most applications; for systems requiring zero-drift over lifetime, the A-grade's 1.5 mV max over temperature still meets 12-bit accuracy (±1.22 mV at 5 V full-scale) without recalibration.

Is the SOT23-5 package of TSX631AILT RoHS and REACH compliant?

Yes-TSX631AILT is manufactured in STMicroelectronics' RoHS-compliant and REACH-conformant facilities. It carries the "ECOPACK2" designation per ST's environmental policy, with lead-free matte tin termination, halogen-free molding compound, and full substance declaration available in ST's official product change notifications (PCNs) and material declarations.

TSX631AILT 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:: 0.12V/µs

Gain Bandwidth Product:: 200 kHz

-3db Bandwidth:: -

Current - Input Bias:: 1 pA

Voltage - Input Offset:: 500 µV

Current - Supply:: 45µA

Current - Output / Channel:: 92 mA

Voltage - Supply Span (Min):: 3.3 V

Voltage - Supply Span (Max):: 16 V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

TSX631AILT FAQ

1.How can I place an order for TSX631AILT through Aetrix?

Please submit a Request for Quotation (RFQ) for TSX631AILT 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 TSX631AILT reliable?

The price and inventory of TSX631AILT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSX631AILT is usually 5 days.

3.What payment methods are accepted for TSX631AILT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSX631AILT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TSX631AILT?

TSX631AILT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TSX631AILT 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 TSX631AILT?

For technical support, including TSX631AILT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSX631AILT requirements.

6.How does Aetrix verify that TSX631AILT is sourced from the original manufacturer or authorized distributors?

All TSX631AILT 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 TSX631AILT meets industry standards.

7.What is the process for return or replacement of TSX631AILT?

All TSX631AILT units undergo pre-shipment inspection (PSI). If there is an issue with TSX631AILT, 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 TSX631AILT part is unused and in its original packaging.

Return procedure for TSX631AILT:

1.Submit a request within 90 days.

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

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