My Inquiry
My Account
STMicroelectronics TS944AID
- Part No.:
- TS944AID
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS944AID.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,786
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TS944AID from STMicroelectronics is a quad rail-to-rail output micropower operational amplifier optimized for single-supply battery operation (2.5 V to 10 V), delivering 1.2 µA supply current per amplifier, 10 kHz gain bandwidth product, and 1 pA typical input bias current. It is used in low-power sensor signal conditioning circuits within smoke/fire detectors and portable pH meters.
For engineers reviewing the TS944AID datasheet, TS944AID pinout, TS944AID application, or TS944AID equivalent, key selection criteria include ultra-low quiescent current stability across supply voltage, rail-to-rail output swing at 3 V, CMOS input stage compatibility with high-impedance sensors, and guaranteed -40°C to +85°C operation in SO-14 packaging.
Technical Context
The TS944AID integrates four independent CMOS-input op-amps in a single SO-14 package, each featuring rail-to-rail output swing down to 100 mV from rails at 3 V with 10 kΩ load, and maintaining constant 1.2 µA supply current from 2.5 V to 10 V. Its 1 pA input bias current enables direct interfacing with high-impedance pH electrodes and piezoresistive sensors without significant DC error.
It operates with a common-mode input range of VDD − 0.2 V to VCC − 1.3 V, supports unity-gain stable operation, and delivers 65° phase margin with 50 pF capacitive load - enabling robust performance in low-noise, low-frequency instrumentation loops without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply current per amp | 1.2 µA typ. - enables multi-year battery life in coin-cell–powered detectors |
| Input bias current | 1 pA typ. - preserves accuracy when amplifying signals from >1 GΩ sensor sources |
| Gain bandwidth product | 10 kHz - sufficient for DC–1 kHz sensor signal conditioning (e.g., thermistor, gas sensor outputs) |
| Output swing (3 V, RL=10 kΩ) | 2.85 V high / 100 mV low - delivers full dynamic range into ADC reference rails |
| Common-mode rejection | 85 dB typ. - suppresses supply noise and PCB coupling in single-supply layouts |
| Input offset voltage | 5 mV max. (A-grade) - ensures <±1% error in 1 V full-scale pH buffer measurement |
| Slew rate | 3 V/ms - adequate for step response settling in <1 ms for slow-varying environmental signals |
Pinout & Package
TS944AID is housed in a 14-lead SOIC (SO-14) package with standard 1.27 mm pitch, 8.55–8.75 mm body length, and 3.80–4.00 mm width. Thermal resistance is 103 °C/W (junction-to-ambient).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Rail-to-rail output of amplifier A - drives ADC input or comparator threshold directly |
| 2 | IN− A | Inverting input of amplifier A - accepts feedback network for precision gain setting |
| 3 | IN+ A | Non-inverting input of amplifier A - connects to high-Z sensor node with minimal loading |
| 4 | V− | Negative supply rail - tied to ground in single-supply configurations |
| 5 | IN+ B | Non-inverting input of amplifier B - used for reference buffering or dual-sensor differential pair |
| 6 | IN− B | Inverting input of amplifier B - configured for transimpedance or active filtering |
| 7 | OUT B | Rail-to-rail output of amplifier B - provides second channel for ratiometric sensing |
| 8 | OUT C | Rail-to-rail output of amplifier C - supports auxiliary functions (e.g., power-good monitoring) |
| 9 | IN− C | Inverting input of amplifier C - accepts inverted reference for level-shifting |
| 10 | IN+ C | Non-inverting input of amplifier C - interfaces with temperature-compensation network |
| 11 | V+ | Positive supply rail - accepts 2.5–10 V battery or regulated rail |
| 12 | IN+ D | Non-inverting input of amplifier D - used for calibration offset injection |
| 13 | IN− D | Inverting input of amplifier D - configured as unity-gain buffer for reference voltage |
| 14 | OUT D | Rail-to-rail output of amplifier D - delivers stable buffered reference to other channels |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings within 100 mV of V− and V+ at 3 V - maximizes usable ADC input range in low-voltage systems |
| Micropower operation | 1.2 µA per amplifier independent of supply voltage - eliminates battery drain concerns in always-on detectors |
| CMOS input stage | 1 pA input bias current - prevents voltage error across >100 MΩ source impedances (e.g., glass pH electrodes) |
| Latch-up immunity | Class A rated - withstands transient overvoltage events in industrial sensor nodes without destructive failure |
| ESD protection | 2 kV HBM - survives handling and board-level ESD during assembly and field maintenance |
Applications
| Smoke/Fire Detector Signal Chain | pH Meter Front-End |
|---|---|
Use Scenario: Amplifying weak ionization current (pA–nA) from smoke chamber electrodes under 3 V coin-cell power. IC Role / Device Role / Timing Role: Quad op-amp performs transimpedance conversion, reference buffering, comparator hysteresis, and alarm driver - all within one SO-14 footprint. Use Value: 1.2 µA per amplifier extends CR2032 battery life beyond 5 years while maintaining 85 dB CMRR against AC line noise. | Use Scenario: Conditioning mV-level Nernst potential from glass electrode in handheld pH meter powered by two AAA cells. IC Role / Device Role / Timing Role: One amplifier buffers reference electrode, one conditions measuring electrode, one drives ADC, one handles auto-calibration offset. Use Value: 1 pA input bias current avoids >10 mV DC error across 10 GΩ electrode impedance, ensuring ±0.02 pH accuracy. |
| Portable Gas Sensor Interface | Battery-Powered Instrumentation Logger |
Use Scenario: Amplifying low-level analog output (10–100 mV) from electrochemical CO sensor operating on 3.3 V Li-ion cell. IC Role / Device Role / Timing Role: Configured as precision difference amplifier with matched internal resistors to reject common-mode thermal drift. Use Value: Constant 1.2 µA supply current ensures stable gain and offset over full battery discharge (4.2 V → 3.0 V), eliminating recalibration. | Use Scenario: Signal conditioning for thermistor, humidity, and pressure sensors in a solar-charged environmental data logger. IC Role / Device Role / Timing Role: Provides simultaneous gain, filtering, level-shifting, and reference generation for multi-channel 12-bit SAR ADC acquisition. Use Value: Rail-to-rail output swing at 2.5 V supplies full 0–2.5 V ADC input range, improving effective resolution by 0.5 LSB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micropower op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TS944ID | Higher 10 mV max input offset voltage (vs. 5 mV for TS944AID); same 1.2 µA ICC, 1 pA Iib | Acceptable in smoke detector comparator stages where offset is trimmed digitally; not suitable for precision pH front-end | Select TS944ID only when cost sensitivity outweighs need for sub-5 mV offset in analog signal path |
| LMV324IDR | Higher 80 µA supply current; rail-to-rail input/output; 100 nA Iib; 1 MHz GBP | Unsuitable for >2-year battery life; better for higher-speed sensor interfaces (>10 kHz) | Choose LMV324IDR only if system requires >10× faster response and can tolerate 67× higher quiescent current |
Compared with TS944ID and LMV324IDR, TS944AID uniquely balances ultra-low 1.2 µA supply current, 1 pA input bias, and 5 mV max offset - making it the only option qualified for decade-long, high-impedance, single-supply sensor conditioning without periodic recalibration.
Availability
TS944AID is available at Aetrix Electronics and suitable for smoke/fire detectors, portable pH meters, battery-powered gas sensors, and environmental data loggers requiring stable component supply across extended production lifecycles.
Supply support for TS944AID 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 solutions for industrial, automotive, and consumer markets.
The TS94x series belongs to ST's precision micropower op-amp product line, engineered specifically for ultra-low-power, high-impedance sensor interface applications in battery-constrained environments - emphasizing supply current stability, rail-to-rail output, and CMOS input integrity.
FAQ
What is the maximum operating supply voltage for TS944AID?
The absolute maximum supply voltage is 12 V, but the recommended operating range is 2.5 V to 10 V per the datasheet. Operation above 10 V risks exceeding safe junction temperature due to increased power dissipation in the SO-14 package, especially at elevated ambient temperatures.
Does TS944AID support rail-to-rail input?
No - TS944AID features rail-to-rail *output* only. Its common-mode input voltage range is specified as VDD − 0.2 V to VCC − 1.3 V, meaning the inputs cannot swing within 1.3 V of the positive rail. This is typical for CMOS-input op-amps optimized for micropower, not rail-to-rail input capability.
Can TS944AID drive a 10 kΩ load at 3 V supply?
Yes - the datasheet confirms 2.85 V high-level output and 100 mV low-level output into 10 kΩ at 3 V supply, achieving true rail-to-rail swing within 100 mV of both rails. Output current capability exceeds ±650 µA under these conditions, well within the 10 kΩ load requirement.
Is TS944AID qualified for automotive applications?
No - TS944AID is specified for industrial temperature range (−40°C to +85°C) and is not AEC-Q100 qualified. ST does not list it in automotive-grade product families, and its documentation explicitly excludes use in safety-critical or automotive systems unless independently validated by the end customer.
TS944AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
TS944AID FAQ
1.How can I place an order for TS944AID through Aetrix?
Please submit a Request for Quotation (RFQ) for TS944AID 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 TS944AID reliable?
The price and inventory of TS944AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS944AID is usually 5 days.
3.What payment methods are accepted for TS944AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS944AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS944AID?
TS944AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS944AID 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 TS944AID?
For technical support, including TS944AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS944AID requirements.
6.How does Aetrix verify that TS944AID is sourced from the original manufacturer or authorized distributors?
All TS944AID 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 TS944AID meets industry standards.
7.What is the process for return or replacement of TS944AID?
All TS944AID units undergo pre-shipment inspection (PSI). If there is an issue with TS944AID, 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 TS944AID part is unused and in its original packaging.
Return procedure for TS944AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS944AID Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
