Analog Devices Inc. LT1112S8

LT1112S8 Dual Op-Amp Detailed Product Description

The LT1112S8 from Analog Devices represents a pinnacle in the development of low-power, high-precision operational amplifiers for cost-sensitive and performance-critical applications. Designed as a dual-channel, general-purpose amplifier in an 8-pin SO package (3.9mm width), the LT1112S8 provides an optimal balance between power efficiency, input precision, and package size. It is well-suited for engineers and procurement specialists seeking robust op amps that meet rigorous technical and regulatory standards across a broad range of professional sectors. The LT1112S8 is part of Analog Devices’ broader LT1112/LT1114 family, offering a versatile solution that integrates easily into modern analog circuit design.

Main Attributes and Performance Ratings of LT1112S8

The technical appeal of the LT1112S8 centers on its outstanding precision matched with energy efficiency. Prime specification highlights include:

Dual-channel configuration, enabling compact designs and simplified matching for differential applications.

Maximum input offset voltage of just 75μV (low-cost grade) and offset drift as low as 0.5μV/°C, making it highly reliable for precision measurements.

Extremely low input bias current (typically 90pA, max 300pA), ensuring minimal error when interfacing with high-impedance sources such as sensors or bridges.

Low noise operation: 0.3μVp-p typically from 0.1Hz to 10Hz and current noise of 2.2pAp-p, enhancing its suitability for sensitive analog front ends.

Versatile supply voltage operation, supporting ±1V to ±20V (2V to 40V single-supply equivalent), making the amplifier compatible with battery-powered or line-powered designs.

Low supply current per amplifier (typical 370μA), ideal for power-constrained applications.

High open-loop gain (minimum 1 million), large common-mode rejection ratio (120dB min), and strong power-supply rejection, contributing to consistent performance across variable operating conditions.

Output swing close to the rails (up to ±14V with a ±15V supply) and a slew rate of up to 0.27V/μs, providing robust output drive and wide dynamic range.

Together, these features make the LT1112S8 an effective choice for designers who require accuracy, low drift, and ultra-low power consumption without sacrificing performance in instrumentation or sensor signal chains.

LT1112S8 Electrical and Thermal Properties

When selecting operational amplifiers for precision signal processing, it is crucial to consider the amplifier’s electrical and thermal robustness. The LT1112S8 features:

Excellent offset and bias stability over temperature: offset voltage and bias current parameters are meticulously specified both at room temperature and across the operating range of -40°C to 85°C.

High input impedance (differential mode: 20-50MΩ, common mode up to 800GΩ), which reduces loading of preceding circuitry.

Output short-circuit protection and indefinite duration capability, enhancing reliability in safety-critical and laboratory environments.

Supply current remains below 450μA per amplifier over the specified operating temperature range.

Absolute maximum supply voltage rating of ±20V, and the IC can withstand soldering temperatures of up to 300°C (10 seconds), supporting robust assembly processes.

These attributes ensure the LT1112S8 can maintain precise operation and long-term consistency in the face of demanding temperature and electrical stress conditions commonly encountered in industrial, medical, and instrumentation applications.

Packaging, Installation, and Environmental Standards for LT1112S8

The LT1112S8 is supplied in a compact 8-lead SO package (3.9mm width), optimized for surface-mount assembly. This form factor facilitates automated PCB assembly and supports dense analog circuit layouts. Additional package details include:

JEDEC-standard pinout for simplified board integration.

RoHS 3 and REACH compliance, confirming suitability for global markets and environmentally conscious manufacturing.

Moisture Sensitivity Level 1 (Unlimited), indicating no special handling is required during assembly.

These features ensure the LT1112S8 aligns with contemporary manufacturing expectations, regulatory requirements, and miniaturization trends.

LT1112S8 Use Cases and Design Recommendations

The precision, low drift, and low noise characteristics of the LT1112S8 position it as an ideal component for applications such as:

Instrumentation amplifiers: Twoand three-op amp configurations benefit from tight matching and low offset voltage, essential for accurate differential measurement.

Battery-powered systems: The low supply current allows designs powered by small cells (such as two nearly depleted AA batteries).

Thermocouple and bridge amplifiers: Minimal input bias current and low offset are critical for accurate sensor readings.

Low-frequency active filters: Outstanding noise performance and stability, even at low frequencies.

Photocurrent amplifiers: Very low input currents prevent measurement error in photodiode-based systems.

When designing with LT1112S8, engineers should consider the amplifier’s input common-mode range, output swing, and thermal drift properties to maximize system accuracy. Using the LT1112S8 in matched configurations enables the construction of precision analog signal chains that set new benchmarks for accuracy in cost-sensitive applications.

Alternative or Comparable Models to LT1112S8

Engineers and procurement professionals seeking alternatives for the LT1112S8 may consider several drop-in dual-stage precision operational amplifiers, depending on their system requirements:

LT1112CN8/IN8 (Analog Devices): DIP packages offering the same core performance for through-hole applications.

LT1112IS8 (Analog Devices): Industrial-grade variant suitable for wider temperature environments.

LT1114 series (Analog Devices): Quad-channel configurations, matching the LT1112S8’s electrical nearly universally with the additional benefit of higher density.

Other industry-standard options: Devices such as the OP2177 (Analog Devices) or the TLV2172 (Texas Instruments) may also be evaluated, but require careful pin-compatible and specification matching.

System designers should conduct a thorough review of the application’s electrical, mechanical, and regulatory needs before making substitutions.

Conclusion

: Evaluating the LT1112S8 for High-Precision, Low-Power Applications

The Analog Devices LT1112S8 occupies a vital role in the landscape of dual precision operational amplifiers, expertly balancing low-power consumption, input precision, and manufacturability. Its combination of high CMRR, low noise, wide supply voltage support, and environmentally compliant packaging make it an excellent fit for contemporary analog designs. Whether targeting instrumentation, sensor interfacing, or battery-powered applications, the LT1112S8 stands out as a robust selection for engineers prioritizing accuracy and reliability within demanding or cost-constrained projects. Careful review of application demands, combined with appropriate alternative model awareness, will ensure optimal integration of the LT1112S8 into next-generation electronic systems.