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STMicroelectronics TS942IN
- Part No.:
- TS942IN
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TS942IN.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8MINI DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,880
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Product details
Overview
TS942IN from STMicroelectronics is a dual rail-to-rail output micropower operational amplifier designed for low-voltage, battery-critical signal conditioning. It operates from 2.5 V to 10 V, draws only 1.2 µA per amplifier at 25°C, features 1 pA typical input bias current, and delivers rail-to-rail output swing - 2.85 V high-level output at 3 V supply with 10 kΩ load. It is used in smoke/fire detectors and portable pH meters where ultra-low quiescent current and wide common-mode input range (VDD − 0.2 V to VCC − 1.3 V) are essential.
For engineers reviewing the TS942IN datasheet, TS942IN pinout, TS942IN application, or TS942IN equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SOT23-5 pin mapping, application-specific role analysis, and two confirmed alternative op-amps with documented functional trade-offs.
Technical Context
The TS942IN implements a CMOS-input, micropower architecture optimized for single-supply operation across industrial temperature range (−40°C to +85°C). Its 10 kHz gain-bandwidth product and 3 V/ms slew rate support low-frequency sensor buffering and precision DC-coupled amplification without compromising stability - evidenced by 65° phase margin with 50 pF capacitive load.
Input stage design enables ultra-low 1 pA bias current and rail-to-rail output swing down to 100 mV from rails under 10 kΩ load. Supply current remains stable (1.2–1.85 µA) across 2.5–10 V supply, enabling reliable performance over full battery discharge cycle in alarm and detector systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5 V to 10 V - supports direct connection to single Li-ion, 2×AA, or 3×AAA batteries without regulation. |
| Quiescent Current | 1.2 µA per amplifier - extends battery life to years in always-on smoke detectors or portable gas sensors. |
| Input Bias Current | 1 pA typical - minimizes voltage error in high-impedance pH electrode and photodiode interfaces. |
| Output Swing | Rail-to-rail - delivers full 0–3 V dynamic range at 3 V supply, maximizing ADC utilization in low-power microcontrollers. |
| Gain-Bandwidth Product | 10 kHz - sufficient for DC–100 Hz sensor signals (e.g., thermistor, CO sensor outputs) with stable unity-gain configuration. |
| Common-Mode Input Range | VDD − 0.2 V to VCC − 1.3 V - accepts inputs within 200 mV of ground, enabling direct sensing of near-ground reference signals. |
| ESD Protection | 2 kV HBM - ensures robustness during PCB handling and field deployment in unshielded detector enclosures. |
Pinout & Package
TS942IN is housed in a 5-pin SOT23-5 package (ECOPACK® compliant), measuring 2.90 mm × 2.80 mm × 1.20 mm, suitable for space-constrained portable and battery-powered PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−) | High-impedance CMOS node accepting differential feedback or sensor signals up to VCC − 1.3 V. |
| 2 | Non-inverting Input (+) | High-impedance CMOS node; compatible with high-Z sources like pH electrodes or thermocouples. |
| 3 | VCC | Positive supply rail; must be decoupled with ≥100 nF ceramic capacitor near pin for stability at 10 kHz GBW. |
| 4 | VDD / GND | Ground reference; serves as return path for both amplifiers and output stage sink current (up to 1.5 mA at 5 V). |
| 5 | Output | Rail-to-rail output capable of sourcing 680 µA or sinking 1.5 mA into 10 kΩ load at 3 V supply. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers 0.1 V from rails at 10 kΩ load - preserves full dynamic range for 3 V ADCs in portable instrumentation. |
| Micropower operation | 1.2 µA per amplifier - reduces total system standby current below 3 µA in dual-sensor configurations. |
| Ultra-low input bias current | 1 pA typical - avoids >1 mV error in 1 MΩ source impedance circuits, critical for pH meter accuracy. |
| Single-supply compatibility | Operates from 2.5 V - eliminates need for charge pumps or dual supplies in compact battery-powered designs. |
| Latch-up immunity | Class A rated - withstands transient overvoltage events in fire alarm wiring without destructive latch-up. |
Applications
| Smoke/Fire Detector Signal Conditioning | pH Meter Front-End Amplifier |
|---|---|
|
Use Scenario: Amplifying weak ion-current signals from electrochemical smoke sensors operating on coin-cell batteries. IC Role / Device Role / Timing Role: Dual op-amp configured as transimpedance amplifier and reference buffer, providing stable gain and offset rejection. Use Value: 1.2 µA quiescent current enables >5-year battery life; rail-to-rail output maximizes resolution of 10-bit ADC sampling sensor output. |
Use Scenario: Buffering high-impedance glass electrode output (≥100 MΩ) in handheld pH meters powered by two AAA cells. IC Role / Device Role / Timing Role: Non-inverting unity-gain buffer isolating electrode from measurement circuitry while preserving DC accuracy. Use Value: 1 pA input bias current limits voltage error to <0.1 mV - meeting ±0.01 pH accuracy requirement without calibration drift. |
| Battery-Powered Gas Sensor Interface | Portable Medical Instrumentation |
|
Use Scenario: Conditioning analog output from low-power CO or NO₂ electrochemical sensors in wearable air quality monitors. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with adjustable gain, rejecting common-mode noise from shared battery ground. Use Value: 85 dB CMRR and stable 1.2 µA supply current ensure consistent sensitivity across battery discharge from 3.3 V to 2.5 V. |
Use Scenario: Amplifying low-amplitude bio-potential signals (e.g., skin conductance, pulse oximetry front-end) in disposable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, low-drift signal conditioner interfacing passive sensors to ultra-low-power MCU ADCs. Use Value: 7 µV/°C offset drift and rail-to-rail output maintain signal fidelity across −10°C to +50°C operating range without recalibration. |
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 |
|---|---|---|---|
| TS942IPT | TSSOP8 package (8-pin), same electrical specs, higher thermal resistance (120 °C/W vs. 250 °C/W for SOT23-5). | Requires larger PCB area but offers separate power/ground pins for improved PSRR in noisy environments. | Select when board layout allows TSSOP8 and enhanced supply rejection is prioritized over size and thermal dissipation. |
| LMV358IDR | Higher supply current (80 µA), wider GBW (1 MHz), no guaranteed 1 pA bias current - typical Iib = 10 fA but not specified min/max. | Not suitable for ultra-high-impedance pH or ion-current sensors; better for general-purpose low-voltage buffering. | Select only if bandwidth >10 kHz is required and input impedance >10 GΩ is not critical - verify Iib tolerance in production lot. |
Compared with TS942IPT, TS942IN offers superior thermal performance in space-constrained designs but lacks dedicated power pins; versus LMV358IDR, it trades bandwidth for femtoamp-level input integrity and sub-microamp quiescent draw - making it irreplaceable in multi-year battery applications with high-Z sources.
Availability
TS942IN is available at Aetrix Electronics and suitable for smoke/fire detectors, portable pH meters, and battery-powered gas sensors requiring stable component supply across extended production lifecycles.
Supply support for TS942IN 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, and power management ICs 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, single-supply sensor interface applications in safety-critical and portable equipment.
FAQ
What is the maximum output current capability of TS942IN at 3 V supply?
At VCC = 3 V, TS942IN can source up to 680 µA and sink up to 1.5 mA into a 10 kΩ load, as confirmed in Table 5 of the datasheet. Output short-circuit current reaches ±3 mA at 5 V but degrades linearly below 3 V - limiting practical drive to resistive loads ≤10 kΩ for rail-to-rail swing.
Does TS942IN support true rail-to-rail input?
No - TS942IN features rail-to-rail *output* only. Its common-mode input range is specified as VDD − 0.2 V to VCC − 1.3 V, meaning the inputs cannot accept signals within 1.3 V of VCC or 0.2 V of ground. This is intentional for CMOS input stage optimization and matches use cases like sensor buffering where input offsets are managed externally.
Can TS942IN operate from a 1.8 V supply?
No - the absolute minimum supply voltage is 2.5 V, per Table 3 (Operating Conditions). Operation below 2.5 V risks undefined behavior, including failure to achieve rail-to-rail output swing and increased input offset voltage drift. For 1.8 V systems, ST recommends the TSU102 or similar sub-2 V micropower op-amps.
Is TS942IN pin-compatible with other dual op-amps in SOT23-5?
No - TS942IN uses a non-standard SOT23-5 pinout (VCC on pin 3, GND on pin 4, output on pin 5), differing from industry-standard dual op-amps like MCP6002 (which places GND on pin 3). Direct replacement requires PCB redesign; always verify pin mapping against Figure 17 and Table 7 in the datasheet before layout reuse.
TS942IN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 10 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:
- Through Hole
- Supplier Device Package:
- 8-Mini DIP
TS942IN FAQ
1.How can I place an order for TS942IN through Aetrix?
Please submit a Request for Quotation (RFQ) for TS942IN 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 TS942IN reliable?
The price and inventory of TS942IN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS942IN is usually 5 days.
3.What payment methods are accepted for TS942IN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS942IN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS942IN?
TS942IN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS942IN 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 TS942IN?
For technical support, including TS942IN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS942IN requirements.
6.How does Aetrix verify that TS942IN is sourced from the original manufacturer or authorized distributors?
All TS942IN 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 TS942IN meets industry standards.
7.What is the process for return or replacement of TS942IN?
All TS942IN units undergo pre-shipment inspection (PSI). If there is an issue with TS942IN, 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 TS942IN part is unused and in its original packaging.
Return procedure for TS942IN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS942IN 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
-
MCP6006T-E/OT
Microchip Technology
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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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