TS942IN - Dual 1.2 µA Rail-to-Rail Op Amp | STMicroelectronics
MPN: TS942IN ✓ ActiveTS942IN Overview
An operational amplifier is an analog integrated circuit that amplifies the voltage difference between its inverting and non-inverting inputs. The TS94x family belongs to the operational amplifier, analog amplifier, and linear integrated-circuit hierarchy. Operational amplifiers are widely used as voltage followers, buffers, comparators, transimpedance amplifiers, and active analog filters. The TS942IN combines low supply current, single-rail operation, CMOS input characteristics, and rail-to-rail output swing in one low-power analog building block.
The 1.2 µA micropower characteristic makes the TS942IN particularly suitable for battery-operated sensors, portable instruments, and low-energy monitoring systems. Its 2.5 V minimum supply voltage allows operation from a single low-voltage cell or regulated rail. Rail-to-rail output swing is valuable in low-voltage systems because it increases usable output range. The low input bias current reduces errors in source impedance-sensitive circuits and minimizes disturbance to high-impedance sensors.
The TS942IN uses CMOS input circuitry and is intended for general-purpose low-power analog signal processing. Each amplifier can support common inverting, non-inverting, and voltage-following configurations. Because the output approaches the supply rails, careful load and feedback design remains necessary when the output must achieve accurate levels near either rail. Input common-mode range, output swing, gain-bandwidth behavior, and stability conditions should be taken directly from the manufacturer datasheet when selecting feedback networks.
Typical uses include low-frequency sensor conditioning, portable instrumentation, medical monitoring, industrial threshold detection, and energy-efficient data acquisition. In battery-powered equipment, the low supply current reduces the continuous load imposed by the amplifier. In precision measurements, the low input bias current helps preserve the signal from sensors with high source impedance. The device is also useful when one package must provide two matched functional amplifier channels.
Designers should verify the permitted input and output ranges at the selected supply voltage, account for input and output capacitance in feedback layouts, and avoid driving a load that exceeds the amplifier's recommended capability. A stable bypass capacitor close to the supply pins and short, direct routing for high-impedance inputs help preserve low-noise and low-power performance.
This product page combines the manufacturer specifications, package information, sourcing guidance, functional alternatives, and practical circuit-level considerations for engineers evaluating the TS942IN. It is intended to accelerate part selection while keeping the critical design tradeoffs explicit: low power and low bias current versus the bandwidth, noise, and load capability required by a particular signal chain.
Drop-in alternatives for TS942IN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
TS942BIN
✅ Drop-In📋 Reference alternative (not in catalog)
TS942IN Maximum Ratings & Electrical Characteristics
| Amplifier Type | Dual general-purpose operational amplifier |
| Number of Circuits | 2 circuits |
| Supply Voltage Range | 2.5 V to 10 V |
| Supply Type | Single supply |
| Operating Temperature Range | -40 °C to +85 °C |
| Typical Micropower Consumption | 1.2 µA |
| Output Swing | Rail-to-rail |
| Input Bias Current | 1 pA |
| Input Offset Voltage | 0.15 mV |
| Gain Bandwidth Product | 60 dB |
| Output Current Per Channel | 5 mA |
| Input Type | CMOS |
| Package | 8-pin Mini DIP, 7.62 mm row spacing |
| Package Body Width | 0.300 inch |
| Mounting Type | Through-hole |
TS942IN 0.300 inch Pin Configuration Guide
Pin configuration for TS942IN (0.300 inch package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for TS942IN.
Refer to the datasheet for full pin configuration.
Typical Applications
TS942IN is suitable for 6 applications: Battery-Powered Sensor Conditioning, Portable Instrumentation, Industrial Threshold Detection, Medical Monitoring, IoT Sensor Node, Low-Power Active Filtering.
Battery-Powered Sensor Conditioning
The TS942IN fits battery-powered sensor interfaces because its 1.2 µA typical micropower consumption limits the continuous load while two amplifier channels are available in one 8-pin Mini DIP package. Place one channel in a non-inverting configuration and the other in an active-filter or buffer stage when the sensor operates from a 2.5 V to 10 V source. The 1 pA CMOS input bias current reduces disturbance of high-source-impedance sensors, while rail-to-rail output swing increases usable range in low-voltage systems. Confirm the input common-mode range at the actual supply voltage and choose external resistor values with suitable noise and bias-current tolerances.
Recommended
Portable Instrumentation
The TS942IN is suitable for portable measurement equipment that must balance low supply current with usable analog gain. Its dual-channel configuration can amplify one sensor and provide a buffered reference or active-filter stage without requiring two separate amplifier packages. Operation from 2.5 V supports compact single-cell designs, and rail-to-rail output swing helps drive the input range of a low-voltage ADC. The 8-pin Mini DIP format is particularly convenient for through-hole prototypes, educational instruments, and low-volume laboratory assemblies. Validate gain-bandwidth and phase-margin requirements for each feedback network before operating near the upper signal-frequency limit.
Recommended
Industrial Threshold Detection
The TS942IN can implement a low-power threshold detector for industrial sensors, using one amplifier channel for comparison and the other for signal conditioning or filtering. Its 1.2 µA typical micropower consumption reduces supply demand in continuously powered monitoring systems, while the 2.5 V to 10 V operating range supports low-voltage sensor rails. CMOS inputs and 1 pA bias current are advantageous when the detected signal comes from a high-impedance source. For reliable operation, account for input offset voltage, output saturation near the rails, noise, and switching hysteresis; a suitable pull resistor or feedback arrangement can improve threshold repeatability.
Recommended
Medical Monitoring
The TS942IN can support low-power conditioning stages in medical monitoring equipment when the system operates from a low-voltage source. The ultra-low 1 pA input bias current helps preserve weak signals from high-impedance sensors, and the dual amplifier arrangement can process or buffer two related channels. Its 2.5 V minimum supply voltage and 1.2 µA typical micropower consumption suit battery-powered or energy-constrained instruments. Rail-to-rail output can increase signal utilization at low supply voltages. Medical designs still require application-specific validation, including leakage, noise, safety isolation, input protection, and suitability for the selected patient-contact circuitry.
Recommended
IoT Sensor Node
The TS942IN is appropriate for the analog input section of an IoT sensor node where a low-voltage battery or harvested-energy source limits average current. One channel can amplify a bridge, photodiode, or resistive sensor output, while the second channel can form an inverter, filter, or reference buffer. The 1 pA input bias current minimizes loading of high-impedance sensors, and the 1.2 µA typical micropower consumption helps preserve standby energy. Rail-to-rail output supports direct coupling into a low-voltage ADC or comparator. Check the actual common-mode range, noise behavior, and output load capability in the final sensor-node schematic.
Recommended
Low-Power Active Filtering
The TS942IN can implement first-order or higher-order active filters in low-power measurement and control systems. Its dual-channel arrangement allows a Sallen-Key or multiple-feedback stage to be combined with a buffer, and the 1.2 µA typical micropower consumption is useful when every milliamp matters. Rail-to-rail output helps retain usable signal amplitude from a 2.5 V supply, while CMOS inputs limit disturbance to high-impedance filter stages. Component tolerances and amplifier noise can determine practical accuracy, so calculate worst-case gain and cutoff errors. Verify stability with the intended source impedance and the capacitance presented by the following circuit.
Recommended
Engineering reference data for TS942IN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TS942BIN |
|---|---|---|
| Package | 8-pin Mini DIP | 8-pin Mini DIP |
| Brand | STMicroelectronics | STMicroelectronics |
| Amplifier Configuration | Dual | Dual |
| Mounting Type | Through-hole | Through-hole |
Key Differentiators
- Through-hole package matches Mini DIP-oriented designs (vs TL3472IDE4)
- Through-hole package avoids an SOIC land-pattern conversion (vs TLV2322IDRG4)
- Micropower dual-channel operation (vs TL3472IDE4)
Design Notes
Confirm that the complete analog signal path—not only the TS942IN—meets the system's standby-current budget. The amplifier's 1.2 µA typical micropower consumption is low, but bias resistors, sensor bias networks, and input protection devices can dominate the total current. Use the datasheet's typical and maximum current conditions at the intended supply voltage, and calculate average consumption using the actual duty cycle. Place a small bypass capacitor close to the supply pins to control supply-noise coupling without increasing continuous load unnecessarily.
Route high-impedance input nets as short as possible and keep them away from switching nodes, inductors, and the return path of high-current loads. The 1 pA input bias current reduces loading of the source, but very high source resistance can still allow leakage through board contamination or protection diodes to create an error. Use a guarded or grounded keepout region where appropriate, remove flux residue, and place the input sensor or feedback components close to the relevant Mini DIP pins.
Do not assume that rail-to-rail output means the output can reach either supply rail exactly or remain accurate at the extremes. Check output swing versus load current and the input common-mode range at the selected voltage. Also account for the 0.15 mV input-offset figure when precision is important, and verify gain-bandwidth and stability requirements for every feedback configuration. These checks prevent common errors involving saturation, insufficient common-mode range, and unstable filtering stages.
Compliance Information
The STMicroelectronics TS942 product page and the TS942IN product documentation do not provide explicit compliance statements in the cited excerpts. AEC-Q100 is not applicable to the standard industrial TS942IN ordering code.
