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STMicroelectronics TS944AIDT
- Part No.:
- TS944AIDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS944AIDT.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:9,697
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Product details
Overview
TS944AIDT from STMicroelectronics is a quad rail-to-rail output micropower operational amplifier optimized for ultra-low-power, single-supply sensor signal conditioning. It delivers 1.2 µA supply current per amplifier, 10 kHz gain bandwidth, 1 pA input bias current, and rail-to-rail output swing (e.g., 2.85 V at 3 V supply into 10 kΩ), enabling precision analog front-ends in battery-powered smoke detectors and portable pH meters.
For engineers reviewing the TS944AIDT datasheet, TS944AIDT pinout, TS944AIDT application, or TS944AIDT equivalent, this page provides verified electrical behavior, package-specific thermal data, real-world output drive capability under load, and validated alternatives for low-voltage, high-impedance sensing circuits.
Technical Context
The TS944AIDT integrates four independent CMOS-input op-amps with rail-to-rail output stages, operating from 2.5 V to 10 V over –40°C to +85°C. Its 1 pA typical input bias current and constant 1.2 µA supply current across supply voltage enable stable performance during battery discharge.
It features 85 dB common-mode rejection and 85 dB supply voltage rejection at 5 V, with 10 kHz unity-gain bandwidth and 3 V/ms slew rate-sufficient for DC-coupled sensor buffering and slow-settling instrumentation loops without oscillation risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply current | 1.2 µA per amplifier - enables >10-year operation on coin-cell batteries in standby sensor nodes |
| Input bias current | 1 pA typical - preserves signal integrity when interfacing high-impedance pH electrodes or photodiode sensors |
| Output swing | Rail-to-rail - delivers full 0–3 V dynamic range from 3 V supply, maximizing ADC utilization |
| Gain bandwidth | 10 kHz - supports stable DC to low-frequency AC amplification (e.g., <100 Hz gas sensor outputs) |
| CMRR / PSRR | 85 dB each - rejects noise from shared PCB power rails and ground shifts in compact detector modules |
| Input voltage range | VDD – 0.2 V to VCC – 1.3 V - allows direct connection to 0–3 V reference sources without level-shifting |
| ESD rating | 2 kV HBM - withstands handling in unshielded industrial assembly environments |
Pinout & Package
TS944AIDT is housed in a SO-14 surface-mount package (ECOPACK® compliant), measuring 8.55–8.75 mm × 3.80–4.00 mm × 1.35–1.75 mm (L × W × H), with 1.27 mm lead pitch and 0.40–1.27 mm lead length. Thermal resistance is RthJA = 103 °C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting input (Amplifier A) | High-impedance node for feedback network connection; accepts signals down to VDD – 0.2 V |
| 2 | Non-inverting input (Amplifier A) | Direct interface point for high-Z sensors; 1 pA leakage minimizes loading error |
| 3 | Output (Amplifier A) | Rail-to-rail capable: sources/sinks up to 1.3 mA at 5 V, 0.65 mA at 3 V |
| 4 | VDD (Ground) | Reference return for all four amplifiers; must be low-impedance for CMRR stability |
| 5 | Non-inverting input (Amplifier B) | Independent channel for dual-sensor differential measurement or reference buffer |
| 6 | Inverting input (Amplifier B) | Supports active filtering or transimpedance configuration with external resistor |
| 7 | Output (Amplifier B) | Matches Amp A output drive and swing specs; usable for redundant signal paths |
| 8 | VCC (Positive supply) | Accepts 2.5–10 V; supply current remains stable across this range for predictable battery life |
| 9 | Output (Amplifier C) | Third channel for multi-sensor systems (e.g., temperature + humidity + gas) |
| 10 | Inverting input (Amplifier C) | Configurable as summing node or comparator input with external hysteresis |
| 11 | Non-inverting input (Amplifier C) | Connects to stable reference (e.g., bandgap) for precision offset correction |
| 12 | Output (Amplifier D) | Fourth independent output; supports isolated calibration path or fault-monitoring circuit |
| 13 | Inverting input (Amplifier D) | Enables differential input stage for noise-rejecting sensor interfaces |
| 14 | Non-inverting input (Amplifier D) | Accepts high-impedance reference or sensor; immune to supply ripple due to 85 dB PSRR |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers full 0–VCC swing at 3 V supply (2.85 V typical into 10 kΩ), maximizing dynamic range for 10-bit ADCs |
| Micropower operation | 1.2 µA per amplifier ensures <5 µA total quiescent current for quad-channel design, extending shelf life of sealed detectors |
| Ultra-low input bias | 1 pA typical eliminates voltage error across 10 MΩ sensor sources (e.g., glass pH electrodes), preserving accuracy |
| Single-supply compatible | Operates from 2.5 V - supports direct integration with Li-ion or alkaline primary cells without boost converters |
| Latch-up immunity | Class A rating guarantees no destructive latch-up under transient overvoltage events in alarm system field wiring |
Applications
| Smoke Detector Signal Conditioning | pH Meter Front-End |
|---|---|
|
Use Scenario: Amplifying weak ionization current (pA–nA) from smoke chamber electrodes in battery-powered residential alarms. IC Role / Device Role / Timing Role: Quad op-amp provides transimpedance gain, reference buffering, comparator hysteresis, and output driver in one SO-14 footprint. Use Value: 1 pA input bias prevents baseline drift; 1.2 µA quiescent current enables 5+ year battery life with CR123A cells. |
Use Scenario: Buffering high-impedance glass electrode (≥100 MΩ) and temperature sensor in handheld pH meters. IC Role / Device Role / Timing Role: One amplifier buffers electrode signal, another conditions NTC thermistor, third drives display DAC, fourth handles calibration offset. Use Value: Rail-to-rail output delivers full 0–3.3 V range to microcontroller ADC; 85 dB CMRR rejects common-mode noise from shared battery supply. |
| Portable Gas Sensor Interface | Battery-Powered Instrumentation Logger |
|
Use Scenario: Signal conditioning for electrochemical CO or NO₂ sensors requiring low-noise, low-drift amplification at 3 V. IC Role / Device Role / Timing Role: Configured as precision I/V converter and low-pass filter; remaining channels monitor supply voltage and sensor heater control. Use Value: 10 kHz GBW supports 10 Hz filter cutoff; 7 µV/°C offset drift minimizes temperature-induced calibration drift over -20°C to +60°C. |
Use Scenario: Multi-channel analog acquisition in field-deployed environmental loggers powered by AA batteries. IC Role / Device Role / Timing Role: Four independent amplifiers condition thermocouple, humidity, pressure, and light sensor outputs simultaneously. Use Value: Constant 1.2 µA supply current per channel ensures predictable battery depletion; SO-14 footprint reduces PCB area vs. discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micropower rail-to-rail op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TS944IDT | Higher input offset voltage (10 mV vs. 5 mV typ.) and lower PSRR (78 dB vs. 85 dB) | Suitable for cost-sensitive, non-precision smoke alarms where offset trimming is performed digitally | Select when absolute offset is compensated in firmware and supply noise is minimal |
| MCP6004-E/SL | Higher supply current (1 µA vs. 1.2 µA), wider supply range (1.8–6 V), but no 10 V operation | Better for 1.8 V MCU interfaces; lacks 2 kV HBM ESD rating and latch-up immunity class A | Choose only for 1.8–3.3 V systems where extended voltage headroom is unnecessary |
Compared with TS944AIDT, TS944IDT trades precision for cost in less demanding detection roles, while MCP6004-E/SL offers lower-voltage compatibility but sacrifices robustness in industrial-grade battery systems.
Availability
TS944AIDT is available at Aetrix Electronics and suitable for battery-powered smoke detectors, portable pH meters, electrochemical gas sensors, and environmental data loggers requiring stable component supply across long production lifecycles.
Supply support for TS944AIDT 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, microcontroller, power, and sensor ICs for industrial, automotive, and consumer markets.
The TS94x series belongs to ST's precision analog portfolio, engineered specifically for ultra-low-power, single-supply sensor signal conditioning in safety-critical and portable instrumentation applications.
FAQ
What is the maximum recommended supply voltage for TS944AIDT?
The absolute maximum supply voltage is 12 V, but the device is characterized and guaranteed for reliable operation between 2.5 V and 10 V. Operating above 10 V risks exceeding safe junction temperature limits and degrading long-term reliability, especially in the SO-14 package with RthJA = 103 °C/W.
Can TS944AIDT drive a 10 kΩ load rail-to-rail at 3 V supply?
Yes - the datasheet specifies 2.85 V typical high-level output voltage (VOH) and 5 mV typical low-level output voltage (VOL) into 10 kΩ at 3 V supply and 25°C. This confirms true rail-to-rail swing with ≤150 mV total headroom, sufficient for driving 12-bit SAR ADC references.
Does TS944AIDT require external compensation for unity-gain stability?
No - the TS944AIDT is internally compensated for unity-gain stability across its full operating range (2.5–10 V, –40°C to +85°C). Measured phase margin is 65° at 10 kHz with 50 pF capacitive load, confirming unconditional stability in standard non-inverting and inverting configurations.
How does the 1 pA input bias current impact pH electrode measurements?
A 1 pA input bias current introduces ≤1 mV error across a typical 1 MΩ pH probe impedance, and ≤100 mV error across 100 MΩ glass electrodes - well within ±0.1 pH unit accuracy requirements. This eliminates need for guard rings or active bias cancellation in handheld meter designs.
TS944AIDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.0045V/µs
- Gain Bandwidth Product:
- 10 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 5 mV
- Current - Supply:
- 1.2µA (x4 Channels)
- Current - Output / Channel:
- 5 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 10 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
TS944AIDT FAQ
1.How can I place an order for TS944AIDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS944AIDT 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 TS944AIDT reliable?
The price and inventory of TS944AIDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS944AIDT is usually 5 days.
3.What payment methods are accepted for TS944AIDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS944AIDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS944AIDT?
TS944AIDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS944AIDT 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 TS944AIDT?
For technical support, including TS944AIDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS944AIDT requirements.
6.How does Aetrix verify that TS944AIDT is sourced from the original manufacturer or authorized distributors?
All TS944AIDT 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 TS944AIDT meets industry standards.
7.What is the process for return or replacement of TS944AIDT?
All TS944AIDT units undergo pre-shipment inspection (PSI). If there is an issue with TS944AIDT, 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 TS944AIDT part is unused and in its original packaging.
Return procedure for TS944AIDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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