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

STMicroelectronics TSX634IPT

Name: TSX634IPT
Brand: STMicroelectronics
SKU: TSX634IPT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TSX634IPT

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: TSX634IPT.pdf

Description:: IC CMOS 4 CIRCUIT 14TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:2,442

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Product details

Overview

TSX634IPT from STMicroelectronics is a quad-channel, rail-to-rail input/output CMOS operational amplifier optimized for micropower industrial and automotive signal conditioning. It delivers 200 kHz gain bandwidth, 45 µA supply current per channel at 16 V, 16 V maximum supply voltage, and 1 mV max input offset voltage (standard version), operating across –40 °C to +125 °C for sensor front-ends in battery-powered control modules.

For engineers reviewing the TSX634IPT datasheet, TSX634IPT pinout, TSX634IPT application, or TSX634IPT equivalent, key selection criteria include rail-to-rail operation with high-impedance sensors, ultra-low quiescent current under wide supply range (3.3–16 V), automotive-grade temperature tolerance, and TSSOP14 package compatibility with industry-standard quad op-amp layouts.

Technical Context

The TSX634IPT implements a CMOS input stage enabling 1 pA typical input bias current and 1 TΩ input resistance, supporting direct interfacing with high-impedance sources like piezoresistive or capacitive sensors. Its rail-to-rail input common-mode range extends from V_CC–0.1 V to V_CC+0.1 V, and output swing reaches within 70 mV of both rails at 25 °C with 10 kΩ load.

It features a 200 kHz gain-bandwidth product with 55° phase margin and 9 dB gain margin, ensuring stable unity-gain follower operation. The device achieves 0.12 V/µs slew rate and 5 µV_PP low-frequency (0.1–10 Hz) input noise, making it suitable for precision DC-coupled amplification in low-speed measurement chains.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3.3 V to 16 V - supports direct connection to 12 V automotive rails and 3.3 V microcontroller analog domains without level-shifting.
Quiescent Current per Channel	45 µA typ / 60 µA max at 16 V - enables multi-channel sensing in energy-constrained systems with <1 mA total for all four op-amps.
Gain Bandwidth Product	200 kHz typ - sufficient for anti-aliasing filters, sensor signal conditioning, and active RC filtering up to ~20 kHz.
Input Offset Voltage	1 mV max (standard version, –40 °C to +125 °C) - ensures ≤10 mV error in 10× gain stages over full temperature range.
Input Bias Current	1 pA typ - minimizes voltage error across >100 MΩ source impedances, critical for pH electrodes and photodiode transimpedance stages.
Rail-to-Rail I/O	Input: V_CC–0.1 V to V_CC+0.1 V; Output: within 70 mV of rails (25 °C, 10 kΩ) - maximizes dynamic range in single-supply systems.
Operating Temperature	–40 °C to +125 °C - qualified for under-hood automotive and industrial control environments without derating.

Pinout & Package

TSSOP14 package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 14-pin thin shrink small outline package with exposed pad for thermal enhancement.

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 5, 12	Inverting Input (A, B, C, D)	High-impedance CMOS inputs accepting signals across full rail-to-rail common-mode range.
2, 4, 6, 13	Non-inverting Input (A, B, C, D)	Matched to inverting inputs; supports differential, instrumentation, and buffer configurations.
7	V_CC– (GND)	Ground reference for all four amplifiers; tied to system ground plane for noise immunity.
14	V_CC+	Positive supply rail (3.3–16 V); decoupling capacitor required within 1 cm for stability.
8, 9, 10, 11	Output (A, B, C, D)	Rail-to-rail capable outputs driving ≥10 kΩ loads; sink/source ≥2.5 mA over full temperature range.

Key Features

Feature	Design Value
Automotive qualification	AEC-Q100 Grade 1 compliant - validated for use in engine control, body electronics, and ADAS sensor interfaces.
ESD robustness	4 kV HBM, 1.3 kV CDM - withstands handling and board-level ESD events without latch-up or parameter shift.
Low input offset drift	1–8 µV/°C - maintains calibration integrity in thermally varying enclosures without frequent re-zeroing.
High CMRR	65–85 dB (–40 °C to +125 °C) - rejects power supply ripple and common-mode noise in noisy industrial settings.
Stable with capacitive loads	Supports ≥100 pF loads with proper R_iso compensation - simplifies filter integration without oscillation risk.

Applications

Industrial Signal Conditioning

Automotive Sensor Interface

Use Scenario: Amplifying low-level outputs from strain gauges and RTDs in PLC analog input modules.

IC Role / Device Role / Timing Role: Quad-channel signal conditioner providing gain, filtering, and rail-to-rail buffering before ADC sampling.

Use Value: 45 µA/channel quiescent current enables 16-channel analog front-end designs within 1 W thermal budget.

Use Scenario: Front-end amplification for exhaust gas oxygen (EGO) sensors in engine management units.

IC Role / Device Role / Timing Role: Precision DC amplifier with high CMRR rejecting ignition noise on 12 V supply rails.

Use Value: –40 °C to +125 °C operation and AEC-Q100 qualification ensure reliability in under-hood thermal cycling.

Medical Instrumentation

Active Filtering

Use Scenario: Biopotential signal acquisition (ECG, EMG) in portable diagnostic devices.

IC Role / Device Role / Timing Role: Low-noise, low-power instrumentation amplifier stage with high input impedance.

Use Value: 1 pA input bias current prevents electrode polarization errors in dry-sensor configurations.

Use Scenario: 2nd-order Sallen-Key low-pass filter for anti-aliasing prior to SAR ADC in data loggers.

IC Role / Device Role / Timing Role: Unity-gain stable op-amp implementing frequency-selective signal shaping.

Use Value: 200 kHz GBP and 55° phase margin allow clean 20 kHz cutoff without peaking or ringing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSX634AIPR	Enhanced offset voltage: 500 µV max (25 °C), 1.5 mV max (–40 °C to +125 °C)	Better DC accuracy for precision bridge sensor readouts requiring <1 LSB error at 12-bit resolution	Select when offset drift and initial V_io dominate system error budget over cost or availability
LMV324IDR	Higher supply current (130 µA/ch), lower GBP (1 MHz), no AEC-Q100 qualification	Suitable for commercial-grade consumer electronics but not automotive or extended-temperature industrial use	Choose only for cost-sensitive non-automotive designs where 1 MHz bandwidth is required and 125 °C operation is unnecessary

Compared with TSX634IPT, TSX634AIPR trades higher cost for tighter DC specs while retaining identical packaging and temperature range; LMV324IDR offers higher speed but sacrifices micropower operation, automotive qualification, and low-offset performance.

Availability

TSX634IPT is available at Aetrix Electronics and suitable for industrial signal conditioning, automotive sensor interface, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TSX634IPT 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 low-voltage, low-power sensor signal conditioning in harsh environments where rail-to-rail operation and extended temperature range are mandatory.

FAQ

What is the maximum capacitive load the TSX634IPT can drive without instability?

The TSX634IPT remains unity-gain stable with ≥100 pF capacitive loads when a series isolation resistor (R_iso) of ≥10 Ω is added between the output and load. For 470 pF loads, R_iso ≥ 100 Ω is recommended per Figure 17 in the datasheet. Stability is verified across –40 °C to +125 °C with 100 kΩ feedback resistors and 100 pF compensation capacitance.

Does the TSX634IPT support true rail-to-rail output swing at 3.3 V supply?

Yes - at V_CC = 3.3 V and T = 25 °C, the output swings to within 70 mV of both rails with 10 kΩ load (V_OH ≤ 70 mV, V_OL ≤ 70 mV). At –40 °C and +125 °C, this degrades to ≤100 mV, maintaining usable headroom for 10-bit ADC interfaces with 3.3 V references.

How does the input offset voltage drift affect long-term calibration in industrial sensors?

Input offset voltage drift is specified at 1–8 µV/°C over –40 °C to +125 °C. Over a 100 °C ambient swing, worst-case drift is ≤800 µV - equivalent to <0.8 mV error in a unity-gain stage. This allows annual recalibration intervals in fixed-installation equipment, avoiding real-time auto-zero circuitry.

Can the TSX634IPT be used in single-supply photodiode transimpedance applications?

Yes - its 1 pA typical input bias current, rail-to-rail input (down to V_CC––0.1 V), and 1 TΩ input resistance make it suitable for high-gain (≥1 GΩ) transimpedance amplifiers. A 3.3 V supply with virtual ground at V_CC/2 enables bidirectional photocurrent measurement without dual supplies.

TSX634IPT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: CMOS

Number of Circuits:: 4

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:: 14-TSSOP

TSX634IPT FAQ

1.How can I place an order for TSX634IPT through Aetrix?

Please submit a Request for Quotation (RFQ) for TSX634IPT 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 TSX634IPT reliable?

The price and inventory of TSX634IPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSX634IPT is usually 5 days.

3.What payment methods are accepted for TSX634IPT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSX634IPT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TSX634IPT?

TSX634IPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TSX634IPT 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 TSX634IPT?

For technical support, including TSX634IPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSX634IPT requirements.

6.How does Aetrix verify that TSX634IPT is sourced from the original manufacturer or authorized distributors?

All TSX634IPT 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 TSX634IPT meets industry standards.

7.What is the process for return or replacement of TSX634IPT?

All TSX634IPT units undergo pre-shipment inspection (PSI). If there is an issue with TSX634IPT, 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 TSX634IPT part is unused and in its original packaging.

Return procedure for TSX634IPT:

1.Submit a request within 90 days.

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

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