TS974IN - 4-Channel Low-Noise Rail-to-Rail Op Amp | STMicroelectronics
MPN: TS974IN ✓ ActiveTS974IN Overview
An operational amplifier is an analog integrated circuit that amplifies the voltage difference between its non-inverting and inverting inputs. Within the amplifier hierarchy, the TS974IN is a general-purpose precision operational amplifier and a member of the rail-to-rail low-noise amplifier family. Rail-to-rail input and output operation allows the signal to approach the supply rails, improving usable dynamic range in low-voltage and single-supply systems.
The TS974IN provides four amplifier channels in one package, reducing board area and simplifying multi-channel signal-conditioning layouts. Its 4 nV/Hz noise density supports high-resolution analog measurement, while the 12 MHz gain-bandwidth product and 4 V/us slew rate preserve signal fidelity in faster signal paths. The listed ultra-low distortion of 0.003% makes the device suitable for audio preamplification, filtering, buffering, and instrumentation.
The device operates over a supply range extending to 10 V and includes ESD protection rated at 2 kV. The listed latch-up immunity is Class A. Each amplifier is configured as a standard voltage-feedback operational amplifier, allowing the same component to implement inverting, non-inverting, summing, comparator-style, and active-filter circuits. Operating and electrical limits should always be confirmed in the manufacturer datasheet.
Typical uses include four-channel audio preamplification, sensor signal conditioning, active audio filters, low-level instrumentation, data acquisition front ends, and general-purpose analog buffering. Because all four channels share one package, matching and thermal tracking are convenient when several related analog signals are processed under similar conditions.
For low-noise layouts, keep the input and feedback resistors short, place input compensation and decoupling capacitors close to the relevant pins, and avoid routing high-impedance input traces beside digital clock or switching nodes. Select the bypass capacitance and compensation values with the datasheet's stability and noise guidance in mind, particularly when driving capacitive loads.
This page combines the verified TS974IN product characteristics with application guidance, drop-in replacement analysis, and engineering design notes. It is intended to help designers evaluate the TS974IN quickly while completing the mandatory signal-integrity, noise, and stability checks against the full manufacturer documentation.
Drop-in alternatives for TS974IN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TS974IN (same form factor and footprint) — differing in Amplifier Type, Mounting Type, Package, Slew Rate, Voltage Noise Density.
TS974ID
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.2305 / Unit
View Datasheet →TS974IN Maximum Ratings & Electrical Characteristics
| Number of Amplifiers | 4 circuits |
| Amplifier Type | General-purpose operational amplifier |
| Topology | Rail-to-rail output |
| Voltage Noise Density | 4 nV/Hz |
| Total Harmonic Distortion | 0.003% |
| Gain-Bandwidth Product | 12 MHz |
| Slew Rate | 4 V/us |
| Maximum Supply Voltage | 10 V |
| ESD Protection | 2 kV |
| Latch-Up Immunity | Class A |
| Package | 14-DIP (0.300 inch, 7.62 mm pitch) |
| Mounting Type | Through-hole |
TS974IN 14-dip (0.300 inch, 7.62 mm pitch) Pin Configuration Guide
Pin configuration for TS974IN (14-dip (0.300 inch, 7.62 mm pitch) 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 TS974IN.
Refer to the datasheet for full pin configuration.
Typical Applications
TS974IN is suitable for 6 applications: Low-Noise Audio Preamplifier, Active Audio Filter Bank, Sensor Signal Conditioning, Data Acquisition Front End, Precision Instrumentation Buffer, Voltage Reference and Bridge Conditioning.
Low-Noise Audio Preamplifier
The TS974IN fits four-channel audio preamplification because its 4 nV/Hz voltage noise density and 0.003% distortion preserve small signals through the input stage. Each of the four amplifiers can condition a separate mono or balanced channel while operating from the same supply. Use the rail-to-rail output swing to maximize headroom in a single-supply design, and keep the feedback network short to prevent added board noise and phase delay. Verify the required input common-mode range and output drive against the datasheet before fixing the gain resistors.
Recommended
Active Audio Filter Bank
The TS974IN is suitable for a four-channel active filter bank where low noise and high closed-loop bandwidth are both important. Its 12 MHz gain-bandwidth product gives practical headroom for filters set to audible and ultrasonic bands, while the 4 V/us slew rate helps preserve low distortion at larger signal amplitudes. Implement equalizer, crossover, or shelf stages around the four independent channels. Place filter and feedback components close to the device and follow the datasheet stability guidance for capacitive loading and noise measurement bandwidth.
Recommended
Sensor Signal Conditioning
The TS974IN can condition four low-level sensor outputs where the amplifier's 4 nV/Hz noise density helps preserve small-signal information. Place each sensor signal through a high-impedance input stage, then use the other channels for gain, offset correction, filtering, and buffering. The 12 MHz gain-bandwidth product supports both slow industrial sensors and faster measurement signals. Compensation-network selection should match the sensor capacitance, and guarding techniques should be used when high-impedance traces are long.
Recommended
Data Acquisition Front End
The TS974IN works well as a four-channel data-acquisition front end that buffers or amplifies inputs before conversion. Its four independent circuits can handle separate sensor lines while maintaining consistent bias and operating conditions across the channels. The 4 V/us slew rate allows the amplifier to follow higher-amplitude or higher-frequency signals better than a slow precision-only amplifier. Use the manufacturer's compensation recommendations, keep input nodes short, and establish an anti-alias filter before the sampling stage.
Recommended
Precision Instrumentation Buffer
The TS974IN is useful for precision instrumentation buffers that must handle four inputs with low added noise. Its 4 nV/Hz noise density and 0.003% distortion are beneficial when the measured signal is small relative to the instrument's full-scale output. The amplifier can provide unity-gain buffering or moderate inverting and non-inverting gain around each channel. Validate input offset, bias-current error, and common-mode behavior against the actual source impedance because those parameters establish the practical accuracy of the complete chain.
Recommended
Voltage Reference and Bridge Conditioning
The TS974IN can amplify the differential output of resistive bridge sensors and monitor several related voltage signals. Its rail-to-rail output operation helps maximize usable signal range in low-voltage systems, while the low noise density limits added error in the bridge amplifier. Use the four channels for two differential bridge measurements or for bridge excitation monitoring plus auxiliary channels. Follow the datasheet input bias, common-mode range, and noise specifications, and use matched resistors when channel-to-channel accuracy is important.
Recommended
Recommended Products Summary
Engineering reference data for TS974IN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TS974 |
|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics |
| Package | 14-DIP (0.300 inch, 7.62 mm pitch) | 14-DIP (0.300 inch, 7.62 mm pitch) |
| Number of Amplifiers | 4 circuits | 4 circuits |
| Voltage Noise Density | 4 nV/Hz | 4 nV/Hz |
| Gain-Bandwidth Product | 12 MHz | 12 MHz |
| Slew Rate | 4 V/us | 4 V/us |
| Total Harmonic Distortion | 0.003% | 0.003% |
| Maximum Supply Voltage | 10 V | 10 V |
| ESD Protection | 2 kV | 2 kV |
Key Differentiators
- Four low-noise amplifier channels in one through-hole package (vs TLV2402ID)
- Higher listed slew rate for fast large-signal transitions (vs NE5534PSR)
- Rail-to-rail output operation with very low noise density (vs TLV2402ID)
Design Notes
Route each non-inverting input directly to its source with a short trace and minimal area. High-impedance input nodes are sensitive to capacitive pickup, so avoid placing them beside digital clock lines, switching-regulator nodes, or relay contacts. Keep the feedback components adjacent to the relevant amplifier pins and place the manufacturer's recommended compensation capacitor directly at the output or input node. These steps reduce added noise and parasitic feedback that can otherwise mask the TS974IN's 4 nV/Hz noise density.
Treat 4 V/us as the large-signal limit when evaluating fast waveforms. The estimated full-scale swing rate at a 1 V output change is 0.25 us, calculated as 1 V divided by 4 V/us. When driving capacitive loads, follow the manufacturer stability guidance rather than adding large capacitors directly at the output. Isolation resistors or an additional buffer can reduce oscillation risk, but they must be included in the stability simulation and signal-budget analysis.
Do not assume rail-to-rail output operation guarantees an unrestricted rail-to-rail input common-mode range. Verify the input range, supply limits, offset voltage, bias current, and output-current capability against the manufacturer datasheet before finalizing the schematic. Also avoid selecting feedback resistors solely for their nominal value; resistor Johnson noise, source impedance, and the 4 nV/Hz amplifier noise all contribute to the total input-referred noise density.
Compliance Information
The manufacturer datasheet listing confirms a 10 V maximum operating range, 2 kV ESD protection, and Class A latch-up immunity. RoHS, REACH, halogen-free, conflict-minerals, and automotive qualification status require confirmation from the current manufacturer declaration or product documentation.
