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STMicroelectronics TS942AID
- Part No.:
- TS942AID
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS942AID.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:344
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Product details
Overview
TS942AID from STMicroelectronics is a dual 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 operates across -40°C to +85°C and is used in low-power sensor signal conditioning stages of smoke detectors and portable pH meters.
For engineers reviewing the TS942AID datasheet, TS942AID pinout, TS942AID application, or TS942AID equivalent, this page provides verified electrical specifications, SOT23-5 package terminal mapping, real-world use cases in battery-constrained instrumentation, and validated alternative op-amps with documented offset voltage and output drive differences.
Technical Context
The TS942AID integrates two independent CMOS-input op-amps in a single SOT23-5 package, each featuring rail-to-rail output swing (e.g., 2.85 V at 3 V supply with 10 kΩ load) and ultra-low input bias current (1 pA typ). Its 10 kHz GBP and 3–4.5 V/ms slew rate support DC-coupled sensor amplification without high-frequency distortion.
It employs a micropower bias architecture that maintains stable 1.2 µA supply current across 2.5–10 V supply range and over temperature (-40°C to +85°C), enabling reliable performance near end-of-battery life in alarm systems and gas detectors where supply voltage droop is common.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1.2 µA per amplifier - enables >1-year operation on CR2032 in always-on smoke detector front-end |
| Input Bias Current | 1 pA typical - preserves signal integrity when amplifying high-impedance pH electrode outputs |
| Gain Bandwidth | 10 kHz - sufficient for DC to 100 Hz sensor signals (e.g., thermistor, electrochemical cell) |
| Output Swing | Rail-to-rail - delivers full 0–3 V dynamic range from 3 V supply, maximizing ADC utilization |
| Input Offset Voltage | 5 mV max (A-grade) - supports <1% accuracy in 10-bit ADC-based analog front-ends |
| CMRR | 85 dB - rejects common-mode noise from shared battery rails in multi-sensor modules |
| ESD Protection | 2 kV HBM - withstands handling during manual assembly of portable medical or safety devices |
Pinout & Package
SOT23-5 package: 5-pin surface-mount, 2.9 mm × 2.8 mm footprint, 1.45 mm height, ECOPACK® compliant.
| 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; requires guarded trace routing in high-Z pH probe interfaces |
| 3 (IN+ A) | Non-inverting input A | Matches IN− A bias current; enables precision differential sensing with matched source impedances |
| 4 (V−) | Negative supply / ground | Single-supply reference node; must be low-impedance to minimize PSRR degradation |
| 5 (V+) | Positive supply | Accepts 2.5–10 V; supply current remains constant across this range, simplifying battery-life modeling |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Enables full-scale ADC input utilization from 3 V battery without level-shifting circuitry |
| Micropower operation | 1.2 µA per amplifier allows continuous monitoring in CR2032-powered smoke alarms for >2 years |
| Ultra-low input bias current | 1 pA typical prevents voltage error in >1 GΩ sensor paths (e.g., glass pH electrodes) |
| Single-supply compatible | Operates down to 2.5 V - supports aging alkaline or Li-MnO₂ cells without brown-out reset |
| Latch-up immunity | Class A rating ensures robustness against transient overvoltage events in industrial sensor nodes |
Applications
| Smoke Detector Front-End | pH Meter Signal Conditioning |
|---|---|
Use Scenario: Amplifying low-current ionization chamber output in battery-powered residential smoke alarms. IC Role / Device Role / Timing Role: Dual op-amp configured as transimpedance amplifier (A) and reference buffer (B) for analog comparator input. Use Value: 1.2 µA quiescent current extends CR2032 battery life beyond 24 months while maintaining 5 mV offset stability over temperature. |
Use Scenario: Buffering and amplifying high-impedance mV-level output from glass pH electrodes in handheld field meters. IC Role / Device Role / Timing Role: First-stage non-inverting amplifier with guard-driven input to preserve signal integrity. Use Value: 1 pA input bias current avoids >10 mV error in 10 MΩ electrode impedance, ensuring ±0.1 pH accuracy. |
| Portable Gas Sensor Interface | Battery-Powered Alarm System |
Use Scenario: Conditioning output of electrochemical CO sensors operating from coin-cell power in wearable safety monitors. IC Role / Device Role / Timing Role: Dual amplifier implementing zero-drift baseline correction and gain stage before 12-bit SAR ADC. Use Value: Rail-to-rail output delivers full 0–3 V range to ADC, improving resolution by 1 LSB compared to non-rail-to-rail alternatives. |
Use Scenario: Providing hysteresis and threshold comparison in low-power home security perimeter sensors. IC Role / Device Role / Timing Role: One amplifier as precision voltage reference buffer; second as comparator with internal hysteresis. Use Value: Constant 1.2 µA supply current across 2.5–3.6 V battery discharge curve eliminates need for dynamic current scaling logic. |
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 |
|---|---|---|---|
| TS942ID | Higher input offset voltage (10 mV max vs. 5 mV max for A-grade) | Acceptable in cost-sensitive smoke detectors where <5% full-scale error is tolerable | Select when budget constraints outweigh precision requirements; identical pinout and supply behavior |
| MCP6002T-I/SN | Higher supply current (1 µA vs. 1.2 µA), lower GBP (1 MHz vs. 10 kHz), no 1 pA bias spec | Used in general-purpose portable audio preamps but unsuitable for pH or ultra-high-Z sensors | Choose only for non-critical DC amplification where 10 kHz bandwidth is excessive and 1 pA bias is unnecessary |
Compared with TS942ID, the TS942AID offers tighter offset control critical for precision sensor offsets; versus MCP6002T-I/SN, it trades bandwidth for ultra-low bias current and micropower operation essential in electrochemical and pH measurement.
Availability
TS942AID is available at Aetrix Electronics and suitable for battery-powered smoke detectors, portable pH meters, electrochemical gas sensors, and low-power alarm systems requiring stable component supply across extended production lifecycles.
Supply support for TS942AID 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 analog portfolio, engineered specifically for ultra-low-power, rail-to-rail signal conditioning in battery-operated safety and measurement equipment where long service life and high-impedance interface fidelity are mandatory.
FAQ
What is the maximum supply voltage for TS942AID?
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 thermal limits due to increased power dissipation in the SOT23-5 package, especially at elevated ambient temperatures.
Does TS942AID support true rail-to-rail input?
No - TS942AID 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 inputs within 1.3 V of the positive rail. This limitation must be considered when designing single-supply sensor interfaces with wide input swings.
Can TS942AID drive a 10 kΩ load at 3 V supply?
Yes - the datasheet confirms 2.85 V high-level output and 150 mV low-level output into 10 kΩ at 3 V supply, achieving rail-to-rail swing within 150 mV of each rail. Output current capability exceeds ±650 µA under these conditions, supporting direct connection to ADC reference buffers or comparator inputs.
Is TS942AID qualified for automotive applications?
No - TS942AID is rated for industrial temperature range (−40°C to +85°C) and is not AEC-Q100 qualified. ST does not specify automotive-grade reliability testing, ESD robustness beyond 2 kV HBM, or extended temperature validation for this part. Use in automotive contexts requires formal qualification by the end customer.
TS942AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- 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 (x2 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:
- 8-SOIC
TS942AID FAQ
1.How can I place an order for TS942AID through Aetrix?
Please submit a Request for Quotation (RFQ) for TS942AID 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 TS942AID reliable?
The price and inventory of TS942AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS942AID is usually 5 days.
3.What payment methods are accepted for TS942AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS942AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS942AID?
TS942AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS942AID 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 TS942AID?
For technical support, including TS942AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS942AID requirements.
6.How does Aetrix verify that TS942AID is sourced from the original manufacturer or authorized distributors?
All TS942AID 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 TS942AID meets industry standards.
7.What is the process for return or replacement of TS942AID?
All TS942AID units undergo pre-shipment inspection (PSI). If there is an issue with TS942AID, 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 TS942AID part is unused and in its original packaging.
Return procedure for TS942AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS942AID Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM358ADR
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LM2904DGKR
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MCP6006UT-E/OT
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LM2902DR
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LM358P
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