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STMicroelectronics TS944ID
- Part No.:
- TS944ID
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS944ID.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,798
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Product details
Overview
TS944ID 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, 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 TS944ID datasheet, TS944ID pinout, TS944ID application, or TS944ID equivalent, this page provides verified electrical parameters, SO-14 package details, real-world use cases in safety-critical sensing, and validated alternative op-amps with documented offset and drive capability differences.
Technical Context
The TS944ID integrates four independent CMOS-input op-amps on a single die, each featuring rail-to-rail output swing down to 5 mV from VDD and up to 2.85 V from VCC at 3 V supply with 10 kΩ load. Its ultra-low 1.2 µA quiescent current remains stable across 2.5–10 V supply range, enabling extended battery life in end-of-life voltage conditions.
It achieves 85 dB common-mode rejection and 85 dB supply voltage rejection at 5 V, with 100 dB large-signal voltage gain into 1 MΩ load. Phase margin is maintained at 65° with 50 pF capacitive load, supporting stable unity-gain buffer configurations in high-impedance sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1.2 µA per amplifier - enables >1-year operation on CR2032 coin cell in intermittent-sense applications |
| Input Bias Current | 1 pA typical - preserves signal integrity in high-Z pH electrode and gas sensor front-ends |
| Gain Bandwidth | 10 kHz - sufficient for DC–100 Hz sensor amplification without stability risk |
| Output Swing | Rail-to-rail - delivers full dynamic range at 3 V supply, e.g., 2.9 V high-level output at VCC = 3 V |
| CMRR / PSRR | 85 dB / 85 dB - rejects noise from shared battery rails and ambient EMI in compact detector PCBs |
| Operating Temp | -40°C to +85°C - qualified for industrial smoke/fire detection enclosures and outdoor instrumentation |
| ESD Rating | 2 kV HBM - withstands handling during assembly of battery-powered safety devices |
Pinout & Package
TS944ID 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, supporting operation without heatsinking in sealed detector housings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | Inverting Input (−) | High-impedance CMOS node accepting sensor signals up to VCC − 1.3 V |
| 2, 6, 10, 14 | Non-inverting Input (+) | Accepts reference or sensor inputs from VDD − 0.2 V to VCC − 1.3 V |
| 3, 7, 11, 12 | Output | Rail-to-rail capable: sinks 1.3 mA / sources 1.5 mA at VCC = 5 V |
| 4 | VDD (Ground) | Reference return for single-supply operation; must be low-impedance |
| 8 | VCC (Supply) | 2.5–10 V input; supplies all four amplifiers; decoupling required at pin |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers usable 2.9 V swing at 3 V supply into 10 kΩ, maximizing ADC input range |
| Micropower operation | 1.2 µA per amp ensures <1 µA total quiescent draw in 3-amp sensor chain |
| Ultra-low input bias | 1 pA avoids voltage error >10 mV across 10 GΩ pH electrode impedance |
| Latch-up immunity | Class A rating prevents destructive failure during power sequencing in battery systems |
| Single-supply range | 2.5–10 V operation supports direct connection to Li-ion, alkaline, or coin-cell sources |
Applications
| Smoke/Fire Detector Signal Conditioning | pH Meter Front-End Amplifier |
|---|---|
Use Scenario: Amplifying low-current ionization chamber output in battery-powered residential smoke alarms. IC Role / Device Role / Timing Role: Quad op-amp configured as transimpedance amplifier, filter, comparator reference buffer, and LED driver interface. Use Value: 1.2 µA per amplifier extends CR123A battery life beyond 5 years in standby; rail-to-rail output drives comparator reliably at 3 V. |
Use Scenario: Buffering high-impedance glass electrode output in handheld pH meters. IC Role / Device Role / Timing Role: First-stage unity-gain buffer isolating electrode from downstream circuitry. Use Value: 1 pA input bias prevents >100 mV drift over 10 s in 100 MΩ electrode path; CMOS inputs avoid leakage-induced calibration drift. |
| Portable Gas Sensor Interface | Battery-Powered Alarm System Monitor |
Use Scenario: Amplifying microamp-level current from electrochemical CO sensors in wearable safety monitors. IC Role / Device Role / Timing Role: Precision transimpedance stage followed by low-pass filtering before ADC sampling. Use Value: 85 dB CMRR rejects common-mode noise from shared battery rail; stable 10 kHz GBW supports 10 Hz filter cutoff without peaking. |
Use Scenario: Monitoring battery voltage, temperature, and tamper switch status in wireless security alarm panels. IC Role / Device Role / Timing Role: Quad configuration used for VBAT divider scaling, thermistor linearization, switch debouncing, and buzzer drive buffering. Use Value: Single 14-pin SOIC replaces four discrete SOT23-5 op-amps, reducing BOM count and PCB area by 60% in space-constrained enclosures. |
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 vs SO-14's 8.7 × 4.0 mm); identical electrical specs | Required for high-density PCB layouts where SO-14 footprint is prohibitive | Select when board space is constrained and reflow-compatible assembly is available |
| LMV324IDR | Higher supply current (42 µA vs 1.2 µA); wider GBW (1 MHz vs 10 kHz); no rail-to-rail input | Suitable for higher-speed signal paths but unsuitable for multi-year battery life targets | Choose only if bandwidth >100 kHz is needed and battery runtime is secondary |
Compared with TS944ID, TS944IPT offers identical performance in a smaller footprint but requires finer-pitch assembly, while LMV324IDR trades 35× higher current for 100× more bandwidth-making it viable only where speed outweighs energy efficiency.
Availability
TS944ID is available at Aetrix Electronics and suitable for smoke/fire detectors, portable pH meters, battery-powered alarm systems, and gas sensor interfaces requiring stable component supply across long-lifecycle industrial programs.
Supply support for TS944ID 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, designing and manufacturing analog, MCU, 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 sensor signal conditioning in battery-operated safety and measurement equipment.
FAQ
What is the maximum output current capability of TS944ID at 3 V supply?
At VCC = 3 V, TS944ID delivers 680 µA source current and 1.3 mA sink current into loads referenced to VDD (ground). This is confirmed in Table 5 under "Output source/sink current" with VID = ±100 mV test conditions. The output stage remains functional within rail-to-rail swing limits up to these levels without clipping or thermal shutdown.
Does TS944ID support true rail-to-rail input common-mode range?
No. TS944ID features rail-to-rail *output* but not rail-to-rail *input*. Per Table 3, its common-mode input voltage range is VDD − 0.2 V to VCC − 1.3 V - meaning at 3 V supply, inputs must stay between 0.2 V and 1.7 V. This excludes direct connection to VDD or VCC without level-shifting resistors.
Can TS944ID operate from a 1.8 V supply?
No. The absolute minimum supply voltage is 2.5 V, as specified in Table 3 ("Operating conditions"). Operation below 2.5 V risks undefined behavior, including loss of rail-to-rail output swing, increased input offset, and failure to meet quiescent current or bandwidth specifications.
Is TS944ID pin-compatible with other quad op-amps in SO-14 packages like LM324?
No. TS944ID uses standard SO-14 pinout (dual-in-line numbering), but its internal pin mapping differs: pins 1/5/9/13 are inverting inputs, 2/6/10/14 are non-inverting inputs, and 3/7/11/12 are outputs - unlike LM324's staggered input/output arrangement. Direct replacement requires PCB redesign and signal routing changes.
TS944ID 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:
- 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
TS944ID FAQ
1.How can I place an order for TS944ID through Aetrix?
Please submit a Request for Quotation (RFQ) for TS944ID 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 TS944ID reliable?
The price and inventory of TS944ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS944ID is usually 5 days.
3.What payment methods are accepted for TS944ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS944ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS944ID?
TS944ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS944ID 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 TS944ID?
For technical support, including TS944ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS944ID requirements.
6.How does Aetrix verify that TS944ID is sourced from the original manufacturer or authorized distributors?
All TS944ID 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 TS944ID meets industry standards.
7.What is the process for return or replacement of TS944ID?
All TS944ID units undergo pre-shipment inspection (PSI). If there is an issue with TS944ID, 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 TS944ID part is unused and in its original packaging.
Return procedure for TS944ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS944ID Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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