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

STMicroelectronics TSX631IYLT

Name: TSX631IYLT
Brand: STMicroelectronics
SKU: TSX631IYLT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TSX631IYLT

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: SC-74A, SOT-753

Datasheet:: TSX631IYLT.pdf

Description:: IC OPAMP GP 1 CIRCUIT SOT23-5

Quantity:: RFQ Add To RFQ list

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Inventory:2,970

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Product details

Overview

TSX631IYLT 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, 16 V maximum supply voltage, ±500 µV max offset (A-version), and operates across –40°C to +125°C for automotive-grade reliability.

For engineers reviewing the TSX631IYLT datasheet, TSX631IYLT pinout, TSX631IYLT application, or TSX631IYLT equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternatives - all grounded in ST's production datasheet DocID024293 Rev 1.

Technical Context

The TSX631IYLT implements 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 extends common-mode range to within 100 mV of supply rails, while rail-to-rail output delivers full swing under 10 kΩ load.

It features a unity-gain-stable architecture with 55° phase margin and 9 dB gain margin, supporting stable operation with capacitive loads up to 100 pF when using recommended isolation resistors. The device achieves 0.12 V/µs slew rate and 5 µVpp low-frequency noise (0.1–10 Hz) for precision DC-coupled signal chains.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3.3 V to 16 V - supports wide-range industrial and automotive battery-supplied systems without external regulation.
Quiescent Current	45 µA typ / 60 µA max at 16 V - enables multi-year battery life in always-on sensor nodes.
Gain Bandwidth Product	200 kHz typ - sufficient for anti-aliasing, active filtering, and slow-sampling instrumentation (e.g., <10 kHz sensor bandwidth).
Input Offset Voltage	±500 µV max (TSX631A version) - ensures ≤0.5 mV error in 1 V full-scale 12-bit ADC front-ends.
Input Bias Current	1 pA typ - prevents significant voltage drop across >100 MΩ source impedances (e.g., glass pH electrodes).
Operating Temperature	–40°C to +125°C - qualified for under-hood automotive and industrial control cabinet deployment.
ESD Robustness	4 kV HBM - reduces risk of field failure during handling and PCB assembly in unshielded environments.

Pinout & Package

SOT23-5 package: ultra-compact 2.9 mm × 1.6 mm footprint with 0.95 mm height, suitable for space-constrained PCB layouts in portable and embedded modules.

Pin/Terminal	Circuit Role	Design Meaning
1 (OUT)	Output	Push-pull rail-to-rail output capable of sourcing/sinking ≥40 mA at 16 V - drives low-impedance loads directly.
2 (–IN)	Inverting Input	High-impedance CMOS node; accepts signals up to VCC+0.1 V - enables level-shifting and single-supply transimpedance configurations.
3 (V–)	Negative Supply	Ground reference for single-supply operation (0 V) or negative rail in dual-supply - supports true rail-to-rail input down to V–.
4 (+IN)	Non-inverting Input	Matched to –IN with <100 pA input offset current - preserves common-mode rejection in differential sensing.
5 (V+)	Positive Supply	Accepts up to 18 V absolute max - allows 16 V nominal operation with 2 V headroom for transient suppression.

Key Features

Feature	Design Value
Rail-to-rail I/O	Input common-mode range extends to V– –0.1 V and V+ +0.1 V; output swings within 70 mV of rails at 10 kΩ - eliminates level-shifting circuitry in 3.3 V/5 V/12 V systems.
Automotive Qualification	AEC-Q100 Grade 1 compliant - validated for continuous operation at 125°C ambient, meeting ISO/TS 16949 requirements for engine control and ADAS subsystems.
Low-Voltage Operation	Functional down to 3.3 V supply - enables direct interface with modern microcontrollers and low-power MCUs without boost converters.
High ESD Tolerance	4 kV HBM, 1.3 kV CDM - reduces need for external TVS protection in sensor harnesses and exposed connectors.
Stable with Capacitive Loads	Unity-gain stable with 100 pF load when R_iso ≥10 Ω - simplifies layout for remote sensor cables and long traces without compensation networks.

Applications

Industrial Signal Conditioning

Automotive Sensor Interface

Use Scenario: Amplifying low-level outputs 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 sigma-delta ADC front-end, operating at 1 kSPS with DC-coupled path.

Use Value: 1 pA input bias avoids gain error in 10 kΩ bridge arms; rail-to-rail output maximizes dynamic range into 3.3 V ADC reference.

Use Scenario: Signal conditioning for exhaust gas oxygen (EGO) sensors and manifold absolute pressure (MAP) transducers in engine control units.

IC Role / Device Role / Timing Role: High-common-mode-rejection amplifier in differential sensor readout, rejecting ignition noise and alternator ripple.

Use Value: 79 dB CMRR at 25°C and 62 dB over full temperature range maintains <1% measurement error despite ±2 V common-mode transients.

Medical Instrumentation

Active Filtering

Use Scenario: Front-end amplification for ECG electrode signals in portable patient monitors, requiring ultra-low power and high input impedance.

IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer, configured as non-inverting follower with 100 GΩ effective input Z.

Use Value: 5 µVpp 0.1–10 Hz noise ensures <1 µV RMS baseline drift; 45 µA quiescent current extends battery life to >72 hours on two AA cells.

Use Scenario: Second-order Sallen-Key low-pass filter (100 Hz cutoff) for anti-aliasing before SAR ADC in data loggers.

IC Role / Device Role / Timing Role: Unity-gain stable active filter element with 200 kHz GBP - sets precise pole location without peaking or instability.

Use Value: 55° phase margin guarantees monotonic step response; rail-to-rail output preserves full 0–3.3 V filter output swing into 10 kΩ load.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSX631IST	SOT23-5 package, same electrical specs, but standard (non-A) version with 1 mV max V_io at 25°C.	Lower accuracy requirement; acceptable where 12-bit ENOB suffices and cost sensitivity outweighs offset trimming.	Select when budget constraints dominate and system calibration compensates for higher initial offset.
MCP6001T-E/OT	Microchip part: 1 µA I_q, 1 MHz GBP, 1.6 V to 6 V supply - lower power but narrower voltage range and higher noise (15 µVpp).	Battery-powered IoT nodes with sub-1 V_DD operation; unsuitable for 12 V industrial or 16 V automotive rails.	Choose only for ultra-low-power (<2 µA) designs below 6 V; avoid for TSX631IYLT's 16 V/200 kHz use cases.

Compared with TSX631IST, TSX631IYLT offers tighter offset (±500 µV vs. ±1 mV) critical for uncalibrated 14-bit systems; versus MCP6001T-E/OT, it supports 3× higher supply voltage and delivers 2.5× better low-frequency noise performance at matched quiescent current.

Availability

TSX631IYLT is available at Aetrix Electronics and suitable for industrial signal conditioning, automotive sensor interfaces, medical instrumentation, and active filtering requiring stable component supply across extended temperature and voltage ranges.

Supply support for TSX631IYLT 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 sensor solutions for industrial, automotive, and consumer markets.

The TSX63x series belongs to ST's precision analog portfolio, engineered specifically for low-power, high-accuracy sensor signal conditioning in harsh environments - emphasizing rail-to-rail operation, wide supply range, and AEC-Q100 qualification.

FAQ

What is the maximum capacitive load the TSX631IYLT can drive stably in unity-gain configuration?

The TSX631IYLT is unity-gain stable with up to 100 pF capacitive load when a series isolation resistor (R_iso) ≥10 Ω is placed between the output and the load. Without R_iso, oscillation may occur above ~20 pF. This behavior is documented in Figure 17 of ST's DocID024293 Rev 1, validated across –40°C to +125°C.

Does TSX631IYLT support true rail-to-rail input when operated from a single 3.3 V supply?

Yes - the input common-mode voltage range extends from V– –0.1 V to V+ +0.1 V. At 3.3 V supply (V– = 0 V), inputs function correctly from –0.1 V to +3.4 V, covering the full 0–3.3 V range with margin. This is confirmed in Table 3 (Operating Conditions) and Figure 7 of the datasheet.

How does the input offset voltage drift over temperature for TSX631IYLT?

TSX631IYLT (A-version) exhibits ΔV_io/ΔT of 1–8 µV/°C over –40°C to +125°C, with typical value of 1 µV/°C. At 125°C, total drift adds ≤0.8 mV to the 25°C offset (±500 µV), keeping total V_io within ±1.3 mV - verified in Table 4 and Figure 5 of DocID024293 Rev 1.

Can TSX631IYLT be used in dual-supply configurations with ±5 V rails?

Yes - the absolute maximum supply voltage is 18 V, so ±5 V (10 V total) is well within rating. The device maintains rail-to-rail input/output swing relative to its local V+ and V– pins. Common-mode range becomes –5.1 V to +5.1 V, and output swings within 70 mV of ±5 V. This is supported by Table 2 (Absolute Maximum Ratings) and Figure 4.

TSX631IYLT 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:: 100 pA

Voltage - Input Offset:: 1.6 mV

Current - Supply:: 60µA

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:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

TSX631IYLT FAQ

1.How can I place an order for TSX631IYLT through Aetrix?

Please submit a Request for Quotation (RFQ) for TSX631IYLT 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 TSX631IYLT reliable?

The price and inventory of TSX631IYLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSX631IYLT is usually 5 days.

3.What payment methods are accepted for TSX631IYLT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSX631IYLT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TSX631IYLT?

TSX631IYLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TSX631IYLT 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 TSX631IYLT?

For technical support, including TSX631IYLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSX631IYLT requirements.

6.How does Aetrix verify that TSX631IYLT is sourced from the original manufacturer or authorized distributors?

All TSX631IYLT 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 TSX631IYLT meets industry standards.

7.What is the process for return or replacement of TSX631IYLT?

All TSX631IYLT units undergo pre-shipment inspection (PSI). If there is an issue with TSX631IYLT, 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 TSX631IYLT part is unused and in its original packaging.

Return procedure for TSX631IYLT:

1.Submit a request within 90 days.

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

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