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

STMicroelectronics TSX631ILT

Name: TSX631ILT
Brand: STMicroelectronics
SKU: TSX631ILT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TSX631ILT

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: SC-74A, SOT-753

Datasheet:: TSX631ILT.pdf

Description:: IC OPAMP GP 1 CIRCUIT SOT23-5

Quantity:: RFQ Add To RFQ list

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Inventory:1,382

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Product details

Overview

TSX631ILT 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 offset voltage (A-version), 1 pA typical input bias current, and operates from 3.3 V to 16 V - enabling low-power, wide-supply analog front-ends in automotive and medical instrumentation.

For engineers reviewing the TSX631ILT datasheet, TSX631ILT pinout, TSX631ILT application, or TSX631ILT equivalent, key selection criteria include its rail-to-rail operation at ultra-low quiescent current, guaranteed 125 °C operation, low offset drift (1–8 µV/°C), high CMRR (up to 85 dB), and SOT23-5 packaging for space-constrained PCB layouts.

Technical Context

The TSX631ILT implements a CMOS input stage with rail-to-rail common-mode input range (V_CC−0.1 V to V_CC+0.1 V) and rail-to-rail output swing (within 70 mV of rails at 10 kΩ load). Its 200 kHz GBP and 0.12 V/µs slew rate support stable unity-gain follower and active filter configurations across 3.3–16 V supplies.

Designed for harsh environments, it features 4 kV HBM ESD rating, latch-up immunity up to 200 mA, and guaranteed operation from −40 °C to +125 °C. Input resistance exceeds 1 TΩ and input capacitance is 5 pF - preserving signal integrity in high-Z sensor nodes.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3.3 V to 16 V - supports direct interface with 3.3 V microcontrollers and 12 V automotive systems without level-shifting.
Quiescent Current	45–60 µA per amplifier - enables multi-channel battery-powered sensor nodes with >10-year shelf life.
Gain Bandwidth Product	200 kHz typ - sufficient for anti-aliasing filters, thermocouple amplification, and slow-sampling data acquisition.
Input Offset Voltage	±500 µV max (TSX631A version) - reduces DC error in precision bridge sensor circuits without trimming.
Input Bias Current	1 pA typ - prevents loading errors in pH electrodes, photodiode transimpedance stages, and piezoelectric sensors.
CMRR	85 dB max (at 10 V supply) - rejects common-mode noise in noisy industrial 24 V loop-powered transmitters.
Operating Temperature	−40 °C to +125 °C - qualified for under-hood automotive and factory-floor industrial deployment.

Pinout & Package

SOT23-5 package: 2.9 mm × 1.6 mm × 1.1 mm body, surface-mount, lead-free, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1 (OUT)	Output	Rail-to-rail voltage source capable of sourcing/sinking ≥30 mA at 16 V - drives ADC reference buffers or low-impedance loads directly.
2 (−IN)	Inverting Input	High-impedance node (1 TΩ \|\| 5 pF) - preserves signal fidelity in charge-sensitive applications like capacitive touch or MEMS sensing.
3 (V−)	Negative Supply	Ground or negative rail connection - supports single-supply (0 V to 16 V) or dual-supply (±8 V) operation.
4 (+IN)	Non-inverting Input	Matches inverting input in impedance and offset - enables precision differential amplification with matched feedback networks.
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	Enables full dynamic range utilization in single-supply systems - e.g., 0–3.3 V ADC interfacing without level-shifting circuitry.
1 pA Input Bias Current	Minimizes voltage error across high-value feedback resistors (>10 MΩ), critical for low-frequency integrators and electrometer-grade amplifiers.
−40 °C to +125 °C Operation	Eliminates derating calculations for engine control units, motor drives, and industrial PLC analog inputs.
4 kV HBM ESD Rating	Reduces need for external protection diodes in exposed sensor connections - lowers BOM count and board area in field-deployed equipment.
Low 5 µVpp 0.1–10 Hz Noise	Supports sub-microvolt resolution in DC-coupled medical biosignal amplifiers (ECG, EEG) without additional chopper stabilization.

Applications

Industrial Signal Conditioning

Automotive Sensor Interface

Use Scenario: Amplifying low-level outputs from RTD, thermocouple, or strain gauge bridges in programmable logic controllers.

IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier front-end with rail-to-rail output driving 12-bit SAR ADCs.

Use Value: 500 µV max offset and 1 µV/°C drift ensure <0.1% full-scale error over temperature - eliminating calibration in factory-set industrial transmitters.

Use Scenario: Signal conditioning for exhaust gas oxygen (EGO) sensors and brake pressure transducers in engine control modules.

IC Role / Device Role / Timing Role: High-common-mode-rejection buffer isolating sensor signals from noisy 12 V vehicle power domains.

Use Value: 85 dB CMRR and 125 °C rating maintain accuracy during cold cranking and thermal soak - meeting AEC-Q100 Grade 0 requirements.

Medical Instrumentation

Active Filtering

Use Scenario: Front-end amplification of biopotential signals (ECG, EMG) in portable patient monitors.

IC Role / Device Role / Timing Role: Ultra-low-noise, low-bias-current preamplifier with DC-coupled gain and high-pass filtering.

Use Value: 5 µVpp 0.1–10 Hz noise and 1 pA bias current prevent electrode polarization artifacts - enabling clean sub-Hz signal capture without AC coupling.

Use Scenario: Second-order Sallen-Key low-pass filter for anti-aliasing before sigma-delta ADCs in energy metering ICs.

IC Role / Device Role / Timing Role: Unity-gain stable, low-output-impedance buffer implementing frequency-selective signal shaping.

Use Value: 200 kHz GBP and 0.12 V/µs slew rate allow precise cutoff at 10–50 kHz with minimal phase distortion - preserving harmonic content in power quality analysis.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSX631IYLT	Same electrical specs; DFN8 2×2 package (dual-channel variant not applicable - TSX631 is single-channel; this is misaligned part number; verified correct alternative is TSX631IST - same SOT23-5, identical spec, different tape/reel packaging)	Identical functional behavior; differs only in reel size (3,000 vs. 1,000 pcs) and moisture sensitivity level (MSL3 vs. MSL1)	Select TSX631IST for standard SMT assembly compatibility and identical footprint - no layout or schematic change required.
MCP6001T-I/OT	Lower GBP (1 MHz), higher I_Q (100 µA), wider V_CC range (1.8–6 V), but lacks 16 V capability and 125 °C rating	Not suitable for 12 V automotive or industrial 16 V rails; limited to low-voltage portable electronics	Choose only for cost-sensitive, battery-powered 3.3 V systems where 200 kHz bandwidth suffices and extended temperature is unnecessary.

Compared with TSX631ILT, TSX631IST offers identical performance in the same SOT23-5 package with optimized logistics, while MCP6001T-I/OT trades rail voltage and temperature robustness for higher speed and lower cost in narrow-supply applications - making TSX631ILT the sole choice for 12–16 V, high-temp, ultra-low-power sensor front-ends.

Availability

TSX631ILT 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 ranges and long product lifecycles.

Supply support for TSX631ILT 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 micropower op-amp product line, engineered specifically for ultra-low-power, high-accuracy analog signal conditioning in harsh-environment applications - emphasizing rail-to-rail operation, low drift, and automotive qualification.

FAQ

Is TSX631ILT qualified for automotive applications?

Yes. TSX631ILT is AEC-Q100 qualified (Grade 0: −40 °C to +150 °C junction temperature) and specified for operation from −40 °C to +125 °C ambient. Its 4 kV HBM ESD rating, 200 mA latch-up immunity, and 16 V absolute maximum supply make it suitable for engine control, transmission, and chassis modules.

What is the maximum capacitive load the TSX631ILT can drive stably?

TSX631ILT remains unity-gain stable with ≤100 pF capacitive load when using a 100 kΩ feedback resistor. For loads >100 pF, a series isolation resistor (R_iso) of 10–100 Ω is recommended - per Figure 17 in the datasheet - to maintain phase margin above 55° and prevent peaking or oscillation.

Does TSX631ILT support true rail-to-rail input at 3.3 V supply?

Yes. At V_CC = 3.3 V, the common-mode input range extends from −0.1 V to +3.4 V (V_CC + 0.1 V), fully covering the supply rails. This enables direct sensing of signals referenced to ground or V_CC, such as battery voltage monitoring or 0–3.3 V sensor outputs.

How does the offset voltage of TSX631ILT compare between standard and "A" versions?

The TSX631ILT is the standard version with ±1 mV max offset at 25 °C and ±2.4 mV over −40 °C to +125 °C. The "A" version (TSX631A) specifies ±500 µV max at 25 °C and ±1.5 mV over temperature - offering tighter DC accuracy for precision measurement where calibration overhead must be minimized.

TSX631ILT 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:: 1.6 mV

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

TSX631ILT FAQ

1.How can I place an order for TSX631ILT through Aetrix?

Please submit a Request for Quotation (RFQ) for TSX631ILT 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 TSX631ILT reliable?

The price and inventory of TSX631ILT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSX631ILT is usually 5 days.

3.What payment methods are accepted for TSX631ILT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSX631ILT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TSX631ILT?

TSX631ILT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TSX631ILT 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 TSX631ILT?

For technical support, including TSX631ILT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSX631ILT requirements.

6.How does Aetrix verify that TSX631ILT is sourced from the original manufacturer or authorized distributors?

All TSX631ILT 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 TSX631ILT meets industry standards.

7.What is the process for return or replacement of TSX631ILT?

All TSX631ILT units undergo pre-shipment inspection (PSI). If there is an issue with TSX631ILT, 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 TSX631ILT part is unused and in its original packaging.

Return procedure for TSX631ILT:

1.Submit a request within 90 days.

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

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