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

STMicroelectronics TSX634AIPT

Name: TSX634AIPT
Brand: STMicroelectronics
SKU: TSX634AIPT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TSX634AIPT

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: TSX634AIPT.pdf

Description:: IC CMOS 4 CIRCUIT 14TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TSX634AIPT from STMicroelectronics is a quad-channel, rail-to-rail input/output CMOS operational amplifier optimized for micropower sensor signal conditioning in automotive and industrial systems. It delivers 200 kHz gain bandwidth, 45 µA supply current per channel at 16 V, ±500 µV max input offset voltage (enhanced "A" version), and operates from 3.3 V to 16 V supply rails - enabling direct interfacing with high-impedance sensors in battery-constrained or wide-voltage-range applications.

For engineers reviewing the TSX634AIPT datasheet, TSX634AIPT pinout, TSX634AIPT application, or TSX634AIPT equivalent, key selection criteria include its rail-to-rail I/O capability at ultra-low quiescent current, automotive-grade temperature range (–40°C to +125°C), low input bias current (1 pA typ), and TSSOP14 package compatibility with industry-standard quad op-amp layouts.

Technical Context

The TSX634AIPT 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 gain-bandwidth product and 0.12 V/µs slew rate support stable DC-coupled amplification and low-frequency active filtering without phase margin degradation.

It features enhanced input offset voltage performance (≤500 µV max at 25°C, ≤1500 µV over –40°C to +125°C) and low long-term drift (1.8 µV/month typical), making it suitable for precision instrumentation where calibration stability matters. ESD robustness (4 kV HBM) and latch-up immunity (200 mA) are validated for harsh automotive environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3.3 V to 16 V - supports direct connection to 12 V automotive batteries and industrial 15 V rails without regulation.
Quiescent Current (per channel)	45 µA typ / 60 µA max at 16 V - enables multi-channel sensing in always-on, energy-sensitive nodes.
Gain Bandwidth Product	200 kHz typ - sufficient for anti-aliasing, sensor buffering, and 50/60 Hz line-frequency rejection circuits.
Input Offset Voltage (A version)	±500 µV max at 25°C - reduces DC error in high-gain transducer interfaces (e.g., strain gauges, thermopiles).
Input Bias Current	1 pA typ - preserves signal integrity when driving from >1 GΩ sources like pH electrodes or piezoelectric sensors.
Common-Mode Rejection Ratio	85 dB min at 10 V supply - maintains accuracy in noisy industrial ground-referenced measurement paths.
Operating Temperature Range	–40°C to +125°C - qualified for under-hood automotive and factory-floor embedded control applications.

Pinout & Package

TSSOP14 (Thin Shrink Small Outline Package, 4.4 mm × 5.0 mm, 0.65 mm pitch) - surface-mount, thermally efficient, and compatible with standard quad op-amp PCB footprints.

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting input (Channel A)	Accepts differential signal reference for first op-amp; high-impedance node (1 TΩ R_IN) minimizes loading on sensors.
2	Non-inverting input (Channel A)	High-Z input for single-ended or differential sensor signals; rail-to-rail common-mode range enables full-supply utilization.
3	Output (Channel A)	Rail-to-rail swing (70 mV from rails) drives ADC inputs or downstream analog stages directly.
4	V_CC– (GND)	Power return for all four channels; shared ground improves PSRR and simplifies layout.
5	Non-inverting input (Channel B)	Independent high-Z input for second channel; identical specs to Pin 2 ensure matched performance across channels.
6	Inverting input (Channel B)	Differential input pair for Channel B; pin-swap symmetry with Channel A supports balanced design reuse.
7	Output (Channel B)	Full-rail output stage; capable of sourcing/sinking ≥30 mA at 16 V for driving moderate loads.
8	V_CC+	Single positive supply input (3.3–16 V); no negative rail required - simplifies power architecture.
9	Output (Channel C)	Third independent output; same AC/DC specs as Channels A/B - enables multi-sensor parallel processing.
10	Inverting input (Channel C)	Matched input characteristics enable consistent gain-setting resistor networks across all four channels.
11	Non-inverting input (Channel C)	Supports unity-gain buffer or differential configurations without external level-shifting.
12	Non-inverting input (Channel D)	Fourth channel input; pinout aligns with industry-standard TSSOP14 quad op-amp layout (e.g., LM324, TLV2464).
13	Inverting input (Channel D)	Enables drop-in replacement in existing designs using pin-compatible quad amplifiers.
14	Output (Channel D)	Final rail-to-rail output; supports independent feedback networks for each channel without crosstalk.

Key Features

Feature	Design Value
Rail-to-rail input and output	Enables full dynamic range utilization from 3.3 V to 16 V supplies - eliminates need for level-shifting or dual supplies in sensor front-ends.
Automotive qualification (AEC-Q100)	Validated for operation from –40°C to +125°C with 4 kV HBM ESD tolerance - meets requirements for engine control, ADAS sensor modules, and body electronics.
Ultra-low input bias current (1 pA typ)	Preserves signal fidelity from high-impedance sources (e.g., ion-selective electrodes, photodiodes) without requiring guard traces or leakage compensation.
Low offset voltage drift (1 µV/°C typ)	Minimizes thermal-induced DC error in uncalibrated systems - critical for medical instrumentation and portable test equipment.
Stable with capacitive loads up to 470 pF	Eliminates need for isolation resistors in ADC driver or filter applications - simplifies layout and reduces component count.

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: Quad-channel precision buffer and gain stage - each amplifier handles one sensor channel with matched offset and drift.

Use Value: 45 µA per channel enables 16-channel analog input cards with <1 mA total quiescent draw; rail-to-rail I/O maximizes ADC utilization across 0–10 V industrial ranges.

Use Scenario: Signal conditioning for cabin temperature, humidity, and CO₂ sensors in HVAC control units.

IC Role / Device Role / Timing Role: Low-power transimpedance and voltage follower for NDIR and capacitive sensors operating from 12 V battery.

Use Value: 1 pA input bias prevents drift in capacitive humidity sensors; –40°C to +125°C rating ensures reliability in dashboard-mounted modules.

Medical Instrumentation

Active Filtering

Use Scenario: Front-end amplification for portable ECG and pulse oximeter analog signal chains.

IC Role / Device Role / Timing Role: First-stage instrumentation amplifier core (with external resistors) and right-leg drive buffer.

Use Value: ±500 µV max V_IO and 1 µV/°C drift reduce baseline wander; low noise (5 µVpp, 0.1–10 Hz) preserves microvolt-level biopotentials.

Use Scenario: 2nd-order Sallen-Key low-pass filtering for anti-aliasing before SAR ADCs in data loggers.

IC Role / Device Role / Timing Role: Dual op-amp implementing unity-gain buffer + filter stage; third channel used for reference buffering.

Use Value: 200 kHz GBP ensures flat response up to 10 kHz cutoff; rail-to-rail output avoids clipping on 3.3 V ADC references.

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
TSX634IPT	Standard version: 1 mV max V_IO at 25°C (vs. 500 µV for TSX634AIPT); otherwise identical specs and pinout.	Suitable for cost-sensitive industrial controls where ±1 mV offset is acceptable.	Select TSX634IPT if system-level calibration compensates for higher initial offset and long-term drift is managed via firmware.
TLV2464IDR	Higher supply current (550 µA/ch), wider GBW (6.4 MHz), but only 2.7–6 V supply range and no AEC-Q100 qualification.	Preferred for high-speed, low-voltage portable instrumentation - not viable for 12 V automotive or wide-supply industrial use.	Choose TLV2464IDR only for battery-powered, sub-6 V designs requiring >1 MHz bandwidth; avoid for automotive or 12+ V systems.

Compared with TSX634IPT, TSX634AIPT offers tighter offset and drift for precision sensor front-ends, while TLV2464IDR trades micropower and voltage range for speed - making TSX634AIPT the sole option meeting automotive qualification, rail-to-rail operation up to 16 V, and sub-1 mV offset in a TSSOP14 quad package.

Availability

TSX634AIPT is available at Aetrix Electronics and suitable for industrial signal conditioning, automotive sensor interface, medical instrumentation, and active filtering requiring stable component supply across extended temperature and voltage ranges.

Supply support for TSX634AIPT 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 automotive, industrial, and power management solutions, with broad analog portfolio and AEC-Q100-qualified product lines.

The TSX63x series was designed specifically for micropower, rail-to-rail precision amplification in harsh-environment sensor signal chains - targeting automotive cabin sensors, industrial process monitoring, and portable medical devices.

FAQ

What is the maximum capacitive load the TSX634AIPT can drive without instability?

The TSX634AIPT remains stable with capacitive loads up to 470 pF in unity-gain follower configuration, as verified by phase margin measurements (>55°) across temperature and supply voltage. For loads exceeding 470 pF, a small series isolation resistor (R_iso ≥ 10 Ω) restores stability without degrading DC accuracy - confirmed in Figure 17 of the datasheet.

Does the TSX634AIPT require external compensation for unity-gain operation?

No external compensation is required. The TSX634AIPT is internally compensated for unity-gain stability across its full operating range (3.3–16 V, –40°C to +125°C), as evidenced by consistent phase margin (>55°) and gain margin (9 dB) in all Bode plots (Figures 12–15). This eliminates the need for external capacitors or resistors in standard buffer or gain-of-one configurations.

How does the input offset voltage of TSX634AIPT compare between 25°C and 125°C?

At 25°C, TSX634AIPT guarantees ≤±500 µV offset; at full operating temperature (–40°C to +125°C), the limit is ≤±1500 µV. The typical drift is 1 µV/°C, meaning worst-case variation from 25°C to 125°C is ~100 µV - significantly less than the 1500 µV absolute max, enabling predictable error budgeting in uncalibrated high-temp applications.

Can TSX634AIPT operate from a single 3.3 V supply while maintaining rail-to-rail output swing?

Yes. At V_CC = 3.3 V, TSX634AIPT achieves rail-to-rail output swing within 70 mV of both rails (V_OL ≤ 70 mV, V_OH ≥ 3.23 V) under 10 kΩ load, as specified in Table 4. Its rail-to-rail input range extends from –0.1 V to V_CC + 0.1 V, allowing direct connection to 3.3 V logic and low-voltage sensors without level-shifting circuitry.

TSX634AIPT 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:: 700 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:: 14-TSSOP

TSX634AIPT FAQ

1.How can I place an order for TSX634AIPT through Aetrix?

Please submit a Request for Quotation (RFQ) for TSX634AIPT 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 TSX634AIPT reliable?

The price and inventory of TSX634AIPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSX634AIPT is usually 5 days.

3.What payment methods are accepted for TSX634AIPT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSX634AIPT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TSX634AIPT?

TSX634AIPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TSX634AIPT 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 TSX634AIPT?

For technical support, including TSX634AIPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSX634AIPT requirements.

6.How does Aetrix verify that TSX634AIPT is sourced from the original manufacturer or authorized distributors?

All TSX634AIPT 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 TSX634AIPT meets industry standards.

7.What is the process for return or replacement of TSX634AIPT?

All TSX634AIPT units undergo pre-shipment inspection (PSI). If there is an issue with TSX634AIPT, 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 TSX634AIPT part is unused and in its original packaging.

Return procedure for TSX634AIPT:

1.Submit a request within 90 days.

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

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