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STMicroelectronics TS942ID
- Part No.:
- TS942ID
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS942ID.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,830
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Product details
Overview
TS942ID from STMicroelectronics is a dual rail-to-rail output micropower operational amplifier in SO-8 package, operating from 2.5 V to 10 V supply, consuming only 1.2 µA per amplifier, featuring 1 pA typical input bias current and 10 kHz gain bandwidth product - ideal for low-power sensor signal conditioning in smoke detectors and portable instrumentation.
For engineers reviewing the TS942ID datasheet, TS942ID pinout, TS942ID application, or TS942ID equivalent, this page delivers verified electrical specs, SO-8 terminal mapping, real-world use cases in battery-powered safety systems, and validated alternative op-amps with documented offset and drive capability differences.
Technical Context
The TS942ID integrates two independent CMOS-input op-amps with rail-to-rail output swing (e.g., 2.85 V at 3 V supply into 10 kΩ), enabling full dynamic range utilization in single-supply systems. Its ultra-low 1.2 µA supply current remains stable across 2.5–10 V supply voltage, supporting end-of-battery-life operation without performance degradation.
It achieves 85 dB common-mode rejection and 85 dB supply voltage rejection at 5 V, with 10 kHz unity-gain bandwidth and 3 V/ms minimum slew rate - optimized for DC-coupled, low-frequency precision amplification rather than high-speed signal processing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.5 V to 10 V - supports direct integration into 3 V and 5 V battery or regulated systems without level-shifting. |
| Supply current per amp | 1.2 µA typ. - enables multi-year operation on coin-cell batteries in always-on sensing nodes. |
| Input bias current | 1 pA typ. - minimizes voltage error in high-impedance pH electrode or photodiode interfaces. |
| Gain bandwidth product | 10 kHz - sufficient for DC–1 kHz sensor signal amplification (e.g., CO gas sensor outputs). |
| Output swing | Rail-to-rail - delivers full 0–3 V output range from 3 V supply, maximizing ADC input utilization. |
| Input offset voltage | 10 mV max (TS942) - sets baseline accuracy limit for untrimmed low-cost measurement front-ends. |
| CMRR / PSRR | 85 dB each - rejects noise from shared power rails and common-mode interference in compact PCB layouts. |
Pinout & Package
TS942ID is housed in an 8-pin SOIC (SO-8) package with standard JEDEC MS-012AC footprint, 1.27 mm pitch, and 5.0 mm × 6.2 mm body size - compatible with automated SMT assembly and reflow profiles per J-STD-020.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting input of Amp A | Accepts feedback network connection for inverting configurations; high-impedance CMOS node. |
| 2 | Non-inverting input of Amp A | Connects to high-Z sensor sources (e.g., thermistor divider); 1 pA bias current avoids loading errors. |
| 3 | Output of Amp A | Drives 10 kΩ load rail-to-rail; capable of ±1.3 mA sink/source at 5 V for buffered DAC outputs. |
| 4 | VDD (negative supply / ground) | Reference for single-supply operation; must be low-impedance to maintain PSRR performance. |
| 5 | Inverting input of Amp B | Independent channel input; electrically isolated from Amp A except via shared supply pins. |
| 6 | Non-inverting input of Amp B | Enables dual-channel signal conditioning (e.g., differential sensor + reference buffer) in one package. |
| 7 | Output of Amp B | Matches Amp A output behavior; allows simultaneous processing of two analog signals with matched specs. |
| 8 | VCC (positive supply) | Accepts 2.5–10 V; supply current stable across range - simplifies design across varying battery states. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers 0 V to VCC output swing - eliminates need for negative supply in single-ended sensor interfaces. |
| Micropower operation | 1.2 µA per amplifier - enables >10-year battery life in wireless smoke detector standby mode. |
| Ultra-low input bias current | 1 pA typical - preserves signal integrity when amplifying nanoamp-level currents from electrochemical sensors. |
| Latch-up immunity | Class A rated - withstands transient overvoltage events without destructive latch-up in industrial environments. |
| ESD protection | 2 kV HBM - provides robustness during handling and PCB assembly without external protection diodes. |
Applications
| Smoke Detector Signal Conditioning | pH Electrode Amplifier |
|---|---|
|
Use Scenario: Amplifying weak ion-current signals from optical smoke chamber or electrochemical CO sensor. IC Role / Device Role / Timing Role: Dual-channel transimpedance and reference buffer amplifier operating continuously on 3 V lithium battery. Use Value: 1 pA input bias prevents baseline drift; rail-to-rail output maximizes 10-bit ADC resolution across full battery discharge curve. |
Use Scenario: Buffering high-impedance glass pH electrode (≥1 GΩ) into ADC input of portable meter. IC Role / Device Role / Timing Role: Unity-gain voltage follower isolating electrode from ADC sampling capacitance. Use Value: 1 pA bias current avoids >10 mV error at 10 MΩ source impedance; 10 kHz GBW ensures stable DC response. |
| Portable Gas Monitor Front-End | Battery-Powered Instrumentation |
|
Use Scenario: Conditioning analog output of MEMS-based NO₂ sensor in handheld air quality analyzer. IC Role / Device Role / Timing Role: Low-noise, low-drift amplifier stage preceding 12-bit SAR ADC. Use Value: 85 dB CMRR rejects switching noise from onboard DC/DC converter; 1.2 µA draw extends 200 mAh coin-cell life to 7+ years. |
Use Scenario: Dual-channel signal conditioning in handheld multimeter for voltage/current measurement ranges. IC Role / Device Role / Timing Role: Simultaneous scaling and offset adjustment of two independent analog inputs. Use Value: Matched dual architecture ensures consistent gain/offset tracking; SO-8 package enables compact 2-layer PCB layout. |
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 (4.4 × 3.0 mm), same electrical specs - 35% smaller footprint, higher thermal resistance (120 °C/W). | Better suited for space-constrained portable devices; requires tighter layout control for thermal stability. | Select when board area is critical and thermal load is light; verify solder reflow profile compatibility with TSSOP. |
| LMV358IDR | Higher supply current (80 µA), wider GBW (1 MHz), but 35 nA input bias - 35× higher than TS942ID. | Used where speed matters more than battery life; unsuitable for pA-level sensor interfacing. | Choose only if system requires >100 kHz bandwidth and can tolerate reduced battery runtime. |
Compared with TS942IPT, TS942ID offers superior thermal dissipation in SO-8 but occupies more PCB area; versus LMV358IDR, it trades bandwidth for 66× lower quiescent current and 35× lower input bias - making it irreplaceable in ultra-low-power, high-impedance sensing.
Availability
TS942ID is available at Aetrix Electronics and suitable for smoke/fire detection systems, portable gas analyzers, handheld pH meters, and battery-powered instrumentation requiring stable component supply across long production lifecycles.
Supply support for TS942ID 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, single-supply signal conditioning in safety-critical and portable measurement applications.
FAQ
What is the maximum operating temperature for TS942ID?
The TS942ID is rated for continuous operation from -40°C to +85°C ambient temperature, with absolute maximum junction temperature of 150°C. Thermal resistance junction-to-ambient is 125°C/W in SO-8 package, so at 1.2 µA supply current and 5 V supply, self-heating is negligible (<0.1°C), ensuring reliable performance across the full industrial range.
Can TS942ID drive a 10 kΩ load rail-to-rail at 3 V supply?
Yes - the datasheet specifies VOH = 2.85 V and VOL = 0.15 V (max) at 3 V supply into 10 kΩ, confirming true rail-to-rail output swing. Output source/sink capability exceeds ±1.3 mA at 5 V, and remains functional down to ±0.3 mA at 3 V, fully meeting 10 kΩ load requirements with <1% error.
Is TS942ID pin-compatible with other dual op-amps in SO-8?
No - TS942ID follows standard SO-8 op-amp pinout (Amp A in+/in-/out, V–, Amp B in+/in-/out, V+), matching industry convention (e.g., LM358, TL072). However, its micropower biasing and rail-to-rail output differ electrically from non-rail-to-rail or higher-ICC parts, so functional replacement requires validation of quiescent current and output swing limits.
Does TS942ID require external compensation for unity-gain stability?
No - the TS942ID is internally compensated for unity-gain stability, with 65° phase margin at 10 kHz (CL = 50 pF, RL = 1 MΩ). It drives capacitive loads up to 100 pF directly; for >100 pF, a small series resistor (10–50 Ω) at the output is recommended to prevent peaking, per Figure 14 in the datasheet.
TS942ID 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TS942ID FAQ
1.How can I place an order for TS942ID through Aetrix?
Please submit a Request for Quotation (RFQ) for TS942ID 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 TS942ID reliable?
The price and inventory of TS942ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS942ID is usually 5 days.
3.What payment methods are accepted for TS942ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS942ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS942ID?
TS942ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS942ID 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 TS942ID?
For technical support, including TS942ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS942ID requirements.
6.How does Aetrix verify that TS942ID is sourced from the original manufacturer or authorized distributors?
All TS942ID 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 TS942ID meets industry standards.
7.What is the process for return or replacement of TS942ID?
All TS942ID units undergo pre-shipment inspection (PSI). If there is an issue with TS942ID, 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 TS942ID part is unused and in its original packaging.
Return procedure for TS942ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS942ID Tags
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LM358DT
STMicroelectronics
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