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STMicroelectronics TS942AIN
- Part No.:
- TS942AIN
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TS942AIN.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8MINI DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,166
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Product details
Overview
TS942AIN from STMicroelectronics is a dual 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 product, and 1 pA typical input bias current across 2.5 V to 10 V operation, enabling precision signal conditioning in smoke/fire detectors and portable pH meters.
For engineers reviewing the TS942AIN datasheet, TS942AIN pinout, TS942AIN application, or TS942AIN equivalent, key selection criteria include ultra-low quiescent current stability over supply voltage, rail-to-rail output swing at 3 V (2.85 V typical), and guaranteed -40°C to +85°C operation in SOT23-5 packaging.
Technical Context
The TS942AIN implements CMOS input stage architecture with latch-up immunity (Class A) and ESD protection (2 kV HBM), supporting single-supply operation without input common-mode range restrictions beyond VDD−0.2 V to VCC−1.3 V. Its 10 kHz GBP and 3 V/ms slew rate are maintained across 2.5–10 V supply range.
Output drive capability reaches ±1.3 mA at 3 V (sink/source), with rail-to-rail swing delivering 2.85 V high-level and 0.1 V low-level output into 10 kΩ load at 3 V - critical for analog front-ends interfacing with 3.3 V ADCs in low-power sensor nodes.
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 in high-impedance pH electrode interfaces |
| Gain Bandwidth | 10 kHz - sufficient for DC–1 kHz sensor signal amplification with stable unity-gain feedback |
| Output Swing | Rail-to-rail - delivers full 0–3 V dynamic range into 10 kΩ load at 3 V supply |
| CMRR | 85 dB typical - rejects power supply noise in unregulated battery systems |
| Operating Voltage | 2.5 V to 10 V - supports direct connection to single Li-ion, two alkaline, or three NiMH cells |
| Temperature Range | -40°C to +85°C - qualified for industrial and consumer environmental monitoring deployments |
Pinout & Package
SOT23-5 package: 2.9 mm × 2.8 mm × 1.3 mm body, 0.95 mm lead pitch, surface-mount, RoHS-compliant ECOPACK®.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−) | High-impedance CMOS node accepting differential signals up to VCC−1.3 V |
| 2 | Non-inverting Input (+) | High-impedance CMOS node accepting common-mode inputs down to VDD−0.2 V |
| 3 | VDD (Positive Supply) | Primary power rail; accepts 2.5–10 V; decoupling capacitor required at pin |
| 4 | VSS (Ground) | Reference return path; must be low-impedance for rail-to-rail output fidelity |
| 5 | Output | Capable of sourcing/sinking ±1.3 mA at 3 V; swings within 100 mV of rails into 10 kΩ |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers full 0–VCC dynamic range at 3 V supply, maximizing ADC utilization in 3.3 V systems |
| Micropower operation | 1.2 µA per amplifier enables multi-year operation on CR2032 batteries in wireless sensors |
| Ultra-low input bias current | 1 pA avoids loading of high-Z pH electrodes and piezoelectric transducers |
| Single-supply compatibility | Operates from 2.5 V without negative rail - eliminates charge pump complexity in portable designs |
| Latch-up immunity | Class A rating ensures robustness against transient overvoltage events in field-deployed equipment |
Applications
| Smoke/Fire Detectors | pH Meters |
|---|---|
|
Use Scenario: Amplifying weak ionization chamber currents in battery-powered residential smoke alarms. IC Role / Device Role / Timing Role: Precision transimpedance amplifier converting pA-level chamber current to measurable voltage. Use Value: 1 pA input bias prevents signal corruption; 1.2 µA supply current extends 10-year battery life. |
Use Scenario: Buffering high-impedance glass electrode output in handheld pH meters. IC Role / Device Role / Timing Role: Unity-gain buffer isolating electrode from ADC input capacitance. Use Value: Rail-to-rail output captures full 0–14 pH range at 3 V; CMOS inputs avoid electrode polarization. |
| Battery-Powered Alarms | Portable Gas Sensors |
|
Use Scenario: Signal conditioning for CO or methane detection circuits powered by two AA cells. IC Role / Device Role / Timing Role: Low-noise amplifier driving analog comparator or microcontroller ADC. Use Value: Stable 1.2 µA ICC across 2.5–3.2 V battery discharge curve ensures consistent sensitivity. |
Use Scenario: Amplifying electrochemical sensor output in wearable air quality monitors. IC Role / Device Role / Timing Role: Differential amplifier rejecting common-mode interference in noisy environments. Use Value: 85 dB CMRR suppresses EMI from Bluetooth/Wi-Fi radios; SOT23-5 minimizes PCB footprint. |
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 |
|---|---|---|---|
| TLV2462IDR | Higher supply current (420 µA), wider GBW (6.4 MHz), but same SOT23-8 package footprint | Not suitable for multi-year battery life; better for higher-speed sensor interfaces | Select only when >100 kHz signal bandwidth is required and battery life is secondary |
| LPV521MG/NOPB | Lower supply current (320 nA), lower GBW (6.5 kHz), same rail-to-rail output and SOT23-5 package | Superior battery longevity but insufficient drive strength for 10 kΩ loads at full swing | Prefer for ultra-low-power pH or gas sensors where output load ≥100 kΩ |
Compared with TLV2462IDR and LPV521MG/NOPB, TS942AIN uniquely balances sub-µA quiescent current, usable 10 kHz bandwidth, and ±1.3 mA output drive in SOT23-5 - making it optimal for cost-sensitive, long-life, medium-bandwidth analog sensing.
Availability
TS942AIN is available at Aetrix Electronics and suitable for smoke/fire detectors, portable pH meters, battery-powered alarms, and portable gas sensors requiring stable component supply with guaranteed long-term availability.
Supply support for TS942AIN 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 was developed specifically for ultra-low-power analog signal conditioning in battery-constrained instrumentation - emphasizing rail-to-rail output, picoampere input bias, and supply current stability across voltage and temperature.
FAQ
What is the maximum recommended supply voltage for TS942AIN?
The absolute maximum supply voltage is 12 V, but the device is characterized and specified for reliable operation between 2.5 V and 10 V. Operation above 10 V voids parametric guarantees and risks exceeding thermal limits due to increased junction temperature in the SOT23-5 package.
Can TS942AIN drive a 10 kΩ load rail-to-rail at 3 V?
Yes - at 3 V supply and 25°C, TS942AIN delivers 2.85 V high-level and 0.1 V low-level output into a 10 kΩ load referenced to VCC/2, meeting rail-to-rail specification with ≤150 mV headroom at both extremes per datasheet Table 5.
Is TS942AIN suitable for use with pH electrodes?
Yes - its 1 pA typical input bias current prevents electrode polarization and measurement drift, and its rail-to-rail output captures the full 0–14 pH voltage range (0–840 mV) when paired with standard reference electrodes in 3 V systems.
Does TS942AIN require external compensation for unity-gain stability?
No - the TS942AIN is internally compensated for unity-gain stability across all supply voltages (2.5–10 V) and temperatures (-40°C to +85°C), with 65° phase margin confirmed in datasheet Figure 12 under 1 MΩ load and 50 pF capacitive load conditions.
TS942AIN 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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-Mini DIP
TS942AIN FAQ
1.How can I place an order for TS942AIN through Aetrix?
Please submit a Request for Quotation (RFQ) for TS942AIN 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 TS942AIN reliable?
The price and inventory of TS942AIN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS942AIN is usually 5 days.
3.What payment methods are accepted for TS942AIN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS942AIN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS942AIN?
TS942AIN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS942AIN 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 TS942AIN?
For technical support, including TS942AIN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS942AIN requirements.
6.How does Aetrix verify that TS942AIN is sourced from the original manufacturer or authorized distributors?
All TS942AIN 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 TS942AIN meets industry standards.
7.What is the process for return or replacement of TS942AIN?
All TS942AIN units undergo pre-shipment inspection (PSI). If there is an issue with TS942AIN, 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 TS942AIN part is unused and in its original packaging.
Return procedure for TS942AIN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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