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STMicroelectronics TS944AIN
- Part No.:
- TS944AIN
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
TS944AIN.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,451
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Product details
Overview
TS944AIN from STMicroelectronics is a quad rail-to-rail output micropower operational amplifier optimized for single-supply battery-powered systems. 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 low-power smoke detectors and portable pH meters.
For engineers reviewing the TS944AIN datasheet, TS944AIN pinout, TS944AIN application, or TS944AIN equivalent, this device is selected for ultra-low quiescent current, CMOS-input stability near end-of-battery life, and guaranteed operation from 2.5 V to 10 V across –40°C to +85°C - critical for long-life sensor front-ends and alarm systems.
Technical Context
The TS944AIN integrates four independent CMOS-input op-amps in a single SO-14 package, each featuring rail-to-rail output stage architecture that maintains full dynamic range down to 2.5 V supply. Its 1 pA input bias current and 7 µV/°C offset drift enable high-impedance sensor interfacing without significant DC error accumulation.
Designed for single-supply operation, it supports common-mode input voltage from VDD − 0.2 V to VCC − 1.3 V and achieves 85 dB CMRR and 85 dB SVRR at 5 V, ensuring robust performance in noisy industrial or battery-derived power environments with minimal supply ripple coupling.
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 signal integrity when amplifying high-impedance pH electrode outputs. |
| Gain Bandwidth | 10 kHz - sufficient for DC–1 kHz sensor signal conditioning without instability risk. |
| Output Swing | Rail-to-rail - delivers full 0–3 V range at 3 V supply, maximizing ADC utilization in 10-bit microcontroller systems. |
| Common-Mode Range | VDD − 0.2 V to VCC − 1.3 V - supports direct sensing of ground-referenced transducer signals. |
| ESD Protection | 2 kV HBM - withstands handling stress during PCB assembly of portable medical or safety devices. |
| Operating Temp | −40°C to +85°C - qualified for deployment in uncontrolled environments like building fire alarm panels. |
Pinout & Package
TS944AIN is housed in a 14-pin SOIC (SO-14) package with standard 1.27 mm pitch, 8.55–8.75 mm body length, and ECOPACK® RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | Inverting Input (−) | High-impedance CMOS node accepting differential sensor signals with <1 pA leakage. |
| 2, 6, 10, 14 | Non-inverting Input (+) | Accepts reference or sensor inputs; common-mode range extends to within 0.2 V of VDD. |
| 3, 7, 11, 12 | Output | Rail-to-rail capable: drives loads to within 100 mV of VDD or VCC at 10 kΩ. |
| 4 | VDD (Ground) | Reference return for single-supply operation; must be low-impedance for noise immunity. |
| 8 | VCC (Supply) | 2.5–10 V input; supply current remains stable across this range, easing battery discharge tracking. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 1.2 µA per amplifier ensures multi-year operation on CR2032 cells in wireless smoke detectors. |
| Rail-to-Rail Output | Delivers full-scale output swing at 2.5 V supply, eliminating need for level-shifting in low-voltage MCUs. |
| Ultra-Low Input Bias | 1 pA typical enables accurate amplification of nanoamp-level currents from electrochemical sensors. |
| Single-Supply Flexibility | Operates from 2.5 V to 10 V with constant ICC - simplifies design across alkaline, Li-ion, and 9 V battery platforms. |
| Latch-Up Immunity | Class A rated (200 mA) prevents destructive failure during transient overvoltage events in field-deployed equipment. |
Applications
| Smoke Detector Front-End | pH Meter Signal Chain |
|---|---|
Use Scenario: Amplifying ionization chamber current (sub-pA to nA) in battery-powered residential smoke alarms. IC Role / Device Role / Timing Role: Precision transimpedance amplifier with ultra-low input bias and micropower consumption. Use Value: Enables >5-year battery life while maintaining detection sensitivity below 10 fA input current. |
Use Scenario: Buffering high-impedance glass electrode output (≥100 MΩ) in handheld pH meters. IC Role / Device Role / Timing Role: Unity-gain buffer isolating electrode from ADC input, preserving signal fidelity. Use Value: Prevents measurement drift caused by input loading; 1 pA bias yields <0.1 mV error at 100 MΩ source. |
| Portable Gas Sensor Interface | Battery-Powered Alarm System |
Use Scenario: Conditioning output of electrochemical CO or NO₂ sensors in wearable air quality monitors. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail amplifier driving SAR ADC in 3.3 V microcontroller systems. Use Value: Full 0–3.3 V output range maximizes 12-bit ADC resolution without external biasing networks. |
Use Scenario: Supervising battery voltage, temperature, and siren driver enable logic in home security panels. IC Role / Device Role / Timing Role: Quad comparator and reference buffer supporting multiple analog monitoring channels. Use Value: Single SO-14 IC replaces four discrete op-amps, reducing BOM count and PCB area by 60%. |
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 |
|---|---|---|---|
| TS944IPT | TSSOP14 package (4.9 × 6.4 mm), same electrical specs, lower thermal resistance (100 °C/W vs. 103 °C/W). | Better suited for space-constrained PCBs where SO-14 footprint is prohibitive. | Select when board area is constrained and reflow compatibility with fine-pitch TSSOP is available. |
| LMV324IDR | Higher supply current (45 µA), wider GBW (1 MHz), but no rail-to-rail output at 2.5 V. | Acceptable only in systems with ≥5 V supply and relaxed output swing requirements. | Choose only if higher speed is mandatory and micropower is secondary; not drop-in compatible. |
Compared with TS944AIN, TS944IPT offers identical performance in a smaller footprint ideal for wearables, while LMV324IDR trades 37× higher quiescent current for bandwidth - making TS944AIN irreplaceable in sub-µA always-on sensor nodes.
Availability
TS944AIN is available at Aetrix Electronics and suitable for smoke detector manufacturing, portable pH meter production, and battery-powered alarm system integration requiring stable component supply across extended product lifecycles.
Supply support for TS944AIN 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 TS94x series belongs to ST's precision analog portfolio, engineered specifically for ultra-low-power signal conditioning in battery-operated safety and instrumentation systems where longevity and accuracy are non-negotiable.
FAQ
What is the maximum supply voltage for TS944AIN?
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 internal junction temperature limits under load and voids parametric guarantees - especially critical in sealed enclosures like smoke detectors where heat dissipation is limited.
Does TS944AIN support dual-supply operation?
No - TS944AIN is specified exclusively for single-supply operation with VDD = 0 V and VCC = 2.5–10 V. Its input common-mode range extends to VDD − 0.2 V, and output swings to within 100 mV of VDD, making dual-supply use unsupported and potentially damaging if negative voltage is applied to any pin.
Can TS944AIN drive a 10 kΩ load rail-to-rail at 3 V?
Yes - at VCC = 3 V and TA = 25°C, the typical high-level output voltage is 2.85 V and low-level is 100 mV into 10 kΩ, confirming true rail-to-rail capability. This is validated across temperature (−40°C to +85°C) and supply (2.5–10 V), ensuring consistent ADC interface performance in field-deployed equipment.
Is TS944AIN pin-compatible with other TS94x variants?
Yes - all TS94x quad variants (TS944ID, TS944AID, TS944BID, TS944IPT) share identical SO-14 or TSSOP14 pinouts. Offset voltage grade (B = 2 mV max, A = 5 mV max, standard = 10 mV max) and package define differentiation - allowing direct substitution where precision requirements permit.
TS944AIN 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:
- 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:
- Through Hole
- Supplier Device Package:
- 14-DIP
TS944AIN FAQ
1.How can I place an order for TS944AIN through Aetrix?
Please submit a Request for Quotation (RFQ) for TS944AIN 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 TS944AIN reliable?
The price and inventory of TS944AIN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS944AIN is usually 5 days.
3.What payment methods are accepted for TS944AIN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS944AIN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS944AIN?
TS944AIN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS944AIN 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 TS944AIN?
For technical support, including TS944AIN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS944AIN requirements.
6.How does Aetrix verify that TS944AIN is sourced from the original manufacturer or authorized distributors?
All TS944AIN 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 TS944AIN meets industry standards.
7.What is the process for return or replacement of TS944AIN?
All TS944AIN units undergo pre-shipment inspection (PSI). If there is an issue with TS944AIN, 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 TS944AIN part is unused and in its original packaging.
Return procedure for TS944AIN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS944AIN Tags
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