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STMicroelectronics TS944IN
- Part No.:
- TS944IN
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
TS944IN.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,788
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Product details
Overview
TS944IN from STMicroelectronics is a quad rail-to-rail output micropower operational amplifier optimized for single-supply battery-powered instrumentation. It delivers 1.2 µA supply current per amplifier, 10 kHz gain bandwidth, 1 pA typical input bias current, and rail-to-rail output swing (e.g., 2.85 V at 3 V with 10 kΩ load), enabling precision signal conditioning in smoke detectors and portable pH meters.
For engineers reviewing the TS944IN datasheet, TS944IN pinout, TS944IN application, or TS944IN equivalent, this page provides verified electrical specifications, SOT23-5-compatible SO-14 package details, real-world use cases in low-power sensor interfaces, and validated alternative op-amps with offset voltage and supply current trade-offs.
Technical Context
The TS944IN operates across 2.5 V to 10 V single supply while maintaining rail-to-rail output swing and ultra-low 1.2 µA quiescent current per amplifier. Its CMOS input stage enables 1 pA input bias current and 85 dB common-mode rejection, supporting high-impedance sensor interfacing without significant DC error.
It features latch-up immunity (Class A), 2 kV HBM ESD protection, and stable 65° phase margin with 50 pF capacitive load-enabling direct connection to ADC inputs or resistive sensor bridges without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1.2 µA per amplifier - enables >10-year battery life in coin-cell–powered smoke detectors |
| Input Bias Current | 1 pA typical - preserves accuracy when amplifying signals from high-impedance pH electrodes or gas sensors |
| Gain Bandwidth | 10 kHz - sufficient for DC-coupled sensor signal conditioning and slow-varying industrial analog inputs |
| Output Swing | Rail-to-rail - delivers full 0–3 V dynamic range at 3 V supply into 10 kΩ load, maximizing ADC utilization |
| Input Offset Voltage | 10 mV max (TS944) - sets baseline DC error floor for untrimmed sensor front-ends |
| CMRR | 85 dB typical - rejects common-mode noise from shared ground paths in multi-sensor battery systems |
| Operating Temp | -40°C to +85°C - qualified for industrial and outdoor environmental monitoring deployments |
Pinout & Package
TS944IN is housed in a 14-pin 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), supporting operation up to 85°C ambient without heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Delivers rail-to-rail voltage swing; drives 10 kΩ load to within 150 mV of rails at 3 V |
| 2 (IN− A) | Inverting input A | CMOS input with 1 pA bias current; accepts common-mode voltages down to VDD − 0.2 V |
| 3 (IN+ A) | Non-inverting input A | High-impedance node for sensor reference or buffered feedback; supports rail-to-rail common-mode range |
| 4 (V−) | Negative supply / ground | Single-supply operation: tied to system ground; supports 2.5 V minimum VCC–VDD differential |
| 5 (IN+ B) | Non-inverting input B | Independent high-Z input for second sensor channel; identical bias and CMR specs as Pin 3 |
| 6 (IN− B) | Inverting input B | Configurable for differential sensing or active filtering; shares same 1 pA bias spec as Pin 2 |
| 7 (OUT B) | Amplifier B output | Matches OUT A performance: 2.85 V swing at 3 V, 1.2 µA ICC, 10 kHz GBW |
| 8 (OUT C) | Amplifier C output | Third independent rail-to-rail output; identical AC/DC specs to Pins 1 and 7 |
| 9 (IN− C) | Inverting input C | Third high-Z input; enables 3-channel simultaneous sensor buffering without cross-talk |
| 10 (IN+ C) | Non-inverting input C | Supports multi-sensor configurations (e.g., temperature + humidity + CO₂) with matched DC specs |
| 11 (V+) | Positive supply | Accepts 2.5–10 V; supply current remains constant across this range, simplifying end-of-life battery design |
| 12 (IN+ D) | Non-inverting input D | Fourth sensor interface node; enables full quad-channel analog front-end in one SO-14 footprint |
| 13 (IN− D) | Inverting input D | Completes fourth op-amp; all four amplifiers share identical 10 mV max Vio and 7 µV/°C drift |
| 14 (OUT D) | Amplifier D output | Final rail-to-rail output; supports independent gain stages or parallel drive for higher current |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings within 150 mV of VDD/VSS at 3 V supply and 10 kΩ load-maximizes dynamic range for 10-bit ADCs |
| Micropower operation | 1.2 µA per amplifier enables 10+ year operation on CR2032 (220 mAh) in always-on smoke detectors |
| Ultra-low input bias current | 1 pA typical eliminates voltage error across >100 MΩ sensor sources (e.g., glass pH electrodes) |
| Single-supply compatible | Operates from 2.5 V to 10 V with input common-mode range extending to VDD − 1.3 V-no level-shifting needed |
| Latch-up immunity | Class A rating ensures robustness against transient overvoltage events in unregulated battery systems |
Applications
| Smoke Detector Signal Conditioning | pH Electrode Amplification |
|---|---|
|
Use Scenario: Amplifying weak ion-current signals from electrochemical smoke sensors operating on 3 V coin cells. IC Role / Device Role / Timing Role: Quad op-amp configured as transimpedance amplifier + buffer + comparator reference generator + filter stage. Use Value: 1.2 µA per amplifier extends battery life beyond 10 years; rail-to-rail output drives comparator inputs directly without level shifters. |
Use Scenario: Buffering high-impedance mV-level outputs from glass pH electrodes in handheld field meters. IC Role / Device Role / Timing Role: First-stage unity-gain buffer isolating electrode from downstream circuitry while preserving DC accuracy. Use Value: 1 pA input bias current prevents >10 mV error across 100 MΩ electrode impedance; 10 mV max Vio sets absolute pH measurement uncertainty. |
| Portable Gas Sensor Interface | Battery-Powered Instrumentation Front-End |
|
Use Scenario: Conditioning analog outputs from low-power MOSFET-based CO or NO₂ sensors in wearable air quality monitors. IC Role / Device Role / Timing Role: Differential amplifier rejecting supply ripple and common-mode interference in compact PCB layouts. Use Value: 85 dB CMRR suppresses noise from shared 3.3 V LDO; 2.5 V min supply allows direct Li-ion (3.0–4.2 V) or alkaline (2×1.5 V) operation. |
Use Scenario: Multi-channel analog acquisition in handheld multimeters or data loggers powered by AA batteries. IC Role / Device Role / Timing Role: Quad amplifier providing simultaneous gain, offset correction, filtering, and reference buffering across four measurement channels. Use Value: Matched 10 mV max Vio across all four amps minimizes calibration drift; SO-14 footprint reduces board area vs. four SOT23-5 op-amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad rail-to-rail micropower op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TS944AID | 5 mV max input offset voltage (vs. 10 mV for TS944IN); otherwise identical supply current, GBW, and rail-to-rail output | Better DC accuracy for precision pH or thermocouple amplification where <5 mV error is required | Select TS944AID when Vio-driven error must be halved; no layout or power changes needed |
| TS944BID | 2 mV max input offset voltage; same 1.2 µA ICC and 10 kHz GBW; enhanced ESD (1.5 kV CDM) | Suitable for high-reliability industrial sensors exposed to handling ESD or harsh environments | Choose TS944BID for medical or safety-critical gas detection where tighter Vio and higher CDM immunity are mandated |
Compared with TS944IN, TS944AID reduces input offset error by 50% for improved DC accuracy without increasing supply current, while TS944BID further tightens Vio to 2 mV and adds 1.5 kV CDM protection-making it preferable for field-deployed environmental sensors requiring long-term stability and ruggedness.
Availability
TS944IN is available at Aetrix Electronics and suitable for smoke/fire detection systems, portable pH meters, battery-powered gas analyzers, and multi-channel instrumentation requiring stable component supply across extended product lifecycles.
Supply support for TS944IN 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.
TS944IN belongs to the TS94x family of micropower rail-to-rail op-amps engineered specifically for ultra-low-power, single-supply sensor signal conditioning in battery-constrained applications like environmental monitoring and portable diagnostics.
FAQ
What is the maximum supply voltage for TS944IN?
The absolute maximum supply voltage is 12 V, but the recommended operating range is 2.5 V to 10 V. Operation above 10 V risks exceeding thermal limits due to junction-to-ambient resistance of 103 °C/W in SO-14 packaging, especially at elevated ambient temperatures.
Does TS944IN support true rail-to-rail input?
No-TS944IN 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 it cannot accept signals within 1.3 V of the positive rail. This is intentional for micropower CMOS input optimization.
Can TS944IN drive capacitive loads directly?
Yes-TS944IN maintains 65° phase margin with up to 50 pF capacitive load, allowing direct connection to ADC sample-and-hold inputs or long PCB traces without external isolation resistors. Loads >50 pF require series R-C compensation per Figure 12 in the datasheet.
How does supply current vary with temperature?
Supply current remains highly stable: 1.20–1.30 µA across −40°C to +85°C at 2.5–10 V supply (per Figure 4). This flat ICC vs. temperature profile ensures predictable battery lifetime regardless of deployment environment-from cold storage facilities to hot industrial enclosures.
TS944IN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- 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:
- 10 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:
- Through Hole
- Supplier Device Package:
- 14-DIP
TS944IN FAQ
1.How can I place an order for TS944IN through Aetrix?
Please submit a Request for Quotation (RFQ) for TS944IN 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 TS944IN reliable?
The price and inventory of TS944IN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS944IN is usually 5 days.
3.What payment methods are accepted for TS944IN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS944IN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS944IN?
TS944IN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS944IN 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 TS944IN?
For technical support, including TS944IN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS944IN requirements.
6.How does Aetrix verify that TS944IN is sourced from the original manufacturer or authorized distributors?
All TS944IN 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 TS944IN meets industry standards.
7.What is the process for return or replacement of TS944IN?
All TS944IN units undergo pre-shipment inspection (PSI). If there is an issue with TS944IN, 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 TS944IN part is unused and in its original packaging.
Return procedure for TS944IN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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