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STMicroelectronics TS944IDT
- Part No.:
- TS944IDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS944IDT.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,714
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Product details
Overview
TS944IDT from STMicroelectronics is a quad rail-to-rail output micropower operational amplifier designed for ultra-low-power signal conditioning in battery-critical systems. It operates from 2.5 V to 10 V, draws only 1.2 µA per amplifier, features 1 pA typical input bias current, 10 kHz gain bandwidth, and delivers rail-to-rail output swing - enabling precise analog sensing in smoke detectors and portable pH meters.
For engineers reviewing the TS944IDT datasheet, TS944IDT pinout, TS944IDT application, or TS944IDT equivalent, this page provides verified package mapping (SO-14), confirmed electrical behavior across supply voltage (2.5–10 V), real-world output drive capability (2.85 V at 3 V/10 kΩ), thermal performance (RthJA = 103 °C/W), and validated alternative options for low-power sensor front-ends.
Technical Context
The TS944IDT integrates four independent CMOS-input op-amps in a single SO-14 package, each optimized for micropower operation with constant 1.2 µA supply current over 2.5–10 V supply range. Its rail-to-rail output stage achieves 2.85 V high-level output at 3 V supply with 10 kΩ load, while maintaining 10 kHz gain bandwidth and 65° phase margin under 50 pF capacitive loading.
Input stage design delivers 1 pA typical input bias current and 85 dB common-mode rejection, enabling high-impedance sensor interfacing without significant DC error drift. Latch-up immunity (Class A) and 2 kV HBM ESD protection ensure robustness in industrial and safety-critical environments like fire detection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1.2 µA per amplifier - enables >10-year battery life in 10 µA-systems using coin cells. |
| Input Bias Current | 1 pA typical - preserves signal integrity when amplifying from high-impedance pH electrodes or gas sensors. |
| Gain Bandwidth | 10 kHz - sufficient for DC-coupled sensor buffering and slow-varying industrial transducer signals. |
| Output Swing | Rail-to-rail - delivers full 0–3 V dynamic range at 3 V supply, maximizing ADC utilization in low-voltage systems. |
| CMRR | 85 dB - rejects common-mode noise from shared power rails in multi-sensor alarm panels. |
| ESD Protection | 2 kV HBM - withstands handling and board-level electrostatic discharge during assembly and field service. |
| Operating Temp | -40°C to +85°C - supports deployment in outdoor smoke detectors and unheated industrial enclosures. |
Pinout & Package
TS944IDT is housed in a 14-pin SOIC (SO-14) package with standard 1.27 mm pitch, 8.55–8.75 mm body length, and RthJA = 103 °C/W for thermal management in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | Inverting Input (−) | High-impedance CMOS node accepting differential signals from sensors or feedback networks. |
| 2, 6, 10, 14 | Non-inverting Input (+) | Accepts reference, sensor, or buffered input; 1 pA bias current minimizes voltage drop across high-Z sources. |
| 3, 7, 11, 12 | Output | Rail-to-rail capable: drives 10 kΩ load to within 150 mV of VCC or GND at 3 V supply. |
| 4 | VCC | Positive supply rail (2.5–10 V); decoupling capacitor required near pin for stability. |
| 8 | GND | Analog ground reference; must be low-impedance return path for all four amplifiers. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 1.2 µA per amplifier enables continuous monitoring in battery-powered smoke detectors with >5-year shelf life. |
| Rail-to-Rail Output | Delivers 2.85 V output at 3 V supply into 10 kΩ - maximizes dynamic range for 10-bit ADCs in portable instrumentation. |
| Ultra-Low Input Bias | 1 pA typical eliminates offset errors from high-resistance pH electrode interfaces (>100 MΩ). |
| Single-Supply Range | 2.5–10 V operation supports direct integration with Li-ion, alkaline, or regulated 3.3 V rails without level-shifting. |
| Latch-Up Immunity | Class A rating ensures reliable operation during voltage transients in alarm control panels and industrial sensor nodes. |
Applications
| Smoke/Fire Detection | pH Meter Front-End |
|---|---|
|
Use Scenario: Continuous analog monitoring of ionization chamber or optical smoke sensor output in residential alarm systems. IC Role / Device Role / Timing Role: Quad op-amp buffers and conditions low-current sensor signals before ADC conversion. Use Value: 1.2 µA quiescent current extends CR2032 battery life beyond 7 years; rail-to-rail output ensures full-scale ADC utilization at 3 V. |
Use Scenario: Amplifying microamp-level current from glass pH electrode in handheld or benchtop pH meters. IC Role / Device Role / Timing Role: High-impedance transimpedance amplifier and reference buffer for precision pH measurement. Use Value: 1 pA input bias current prevents electrode polarization error; 85 dB CMRR rejects common-mode noise from shared power supplies. |
| Battery-Powered Alarms | Portable Gas Detectors |
|
Use Scenario: Low-power CO or combustible gas sensor signal conditioning in wireless alarm modules. IC Role / Device Role / Timing Role: Sensor interface amplifier and comparator input stage in ultra-low-duty-cycle wake-up systems. Use Value: Constant 1.2 µA supply current across 2.5–10 V allows stable operation as battery discharges from 3.3 V to 2.6 V. |
Use Scenario: Signal amplification for electrochemical gas sensors in handheld industrial safety monitors. IC Role / Device Role / Timing Role: Transducer signal conditioner with rail-to-rail output driving low-voltage ADCs and display drivers. Use Value: 2 kV HBM ESD protection survives repeated field handling; -40°C to +85°C rating supports outdoor deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower rail-to-rail op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TS944IPT | TSSOP14 package (4.9–5.1 mm width), RthJA = 100 °C/W, identical electrical specs. | Better suited for space-constrained PCBs where SO-14 footprint is prohibitive. | Select for high-density portable designs; requires reflow-compatible layout and tighter placement tolerance. |
| LMV324IDR | Higher supply current (42 µA), lower input bias (10 pA), same SO-14 package, 1 MHz GBW. | Acceptable where higher speed and moderate power budget allow; not suitable for decade-long battery life. | Choose only if system requires >100 kHz bandwidth and can tolerate ~35× higher quiescent current. |
Compared with TS944IDT, TS944IPT offers identical performance in a smaller TSSOP14 package for area-sensitive designs, while LMV324IDR trades 35× higher supply current for 100× greater bandwidth - making TS944IDT uniquely optimal for sub-10 kHz, multi-year battery applications.
Availability
TS944IDT is available at Aetrix Electronics and suitable for smoke/fire detection systems, portable pH meters, battery-powered alarms, and portable gas detectors requiring stable component supply across extended product lifecycles.
Supply support for TS944IDT 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, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.
The TS94x series belongs to ST's precision analog portfolio, engineered specifically for ultra-low-power sensor signal conditioning in battery-operated safety and instrumentation systems.
FAQ
What is the maximum operating supply voltage for TS944IDT?
The absolute maximum supply voltage is 12 V, but the specified operating range is 2.5 V to 10 V. Operation above 10 V voids guaranteed performance per Table 3; sustained use at 12 V risks parametric shift or reliability degradation despite surviving short-term stress.
Does TS944IDT support true rail-to-rail input?
No - TS944IDT features rail-to-rail *output* only. The common-mode input voltage range is specified as VDD − 0.2 V to VCC − 1.3 V (Table 3), meaning it cannot accept inputs within 1.3 V of the positive rail, limiting single-supply high-side sensing without level shifting.
Can TS944IDT drive a 10 kΩ load at 3 V supply?
Yes - the datasheet specifies 2.85 V high-level output (VOH) at 3 V supply with 10 kΩ load (Table 5), confirming 150 mV headroom to VCC. Output sink capability is 1.3 mA (Table 5), sufficient for typical ADC input or LED driver loads.
Is TS944IDT qualified for automotive applications?
No - TS944IDT is rated for industrial temperature range (−40°C to +85°C) and carries no AEC-Q100 qualification. ST does not list it in automotive-grade product lines; for automotive use, consider ST's TSZ12x or TSV91x families with explicit AEC-Q100 certification.
TS944IDT 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SO
TS944IDT FAQ
1.How can I place an order for TS944IDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS944IDT 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 TS944IDT reliable?
The price and inventory of TS944IDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS944IDT is usually 5 days.
3.What payment methods are accepted for TS944IDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS944IDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS944IDT?
TS944IDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS944IDT 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 TS944IDT?
For technical support, including TS944IDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS944IDT requirements.
6.How does Aetrix verify that TS944IDT is sourced from the original manufacturer or authorized distributors?
All TS944IDT 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 TS944IDT meets industry standards.
7.What is the process for return or replacement of TS944IDT?
All TS944IDT units undergo pre-shipment inspection (PSI). If there is an issue with TS944IDT, 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 TS944IDT part is unused and in its original packaging.
Return procedure for TS944IDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS944IDT Tags
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LM358DT
STMicroelectronics
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