Texas Instruments LMC6034IMX/NOPB

Overview

LMC6034IMX/NOPB from Texas Instruments is a quad CMOS operational amplifier optimized for ultra-high-impedance, low-drift signal conditioning in single- or dual-supply systems. It delivers 126dB open-loop gain into 2kΩ loads, 40fA input bias current, and rail-to-rail input common-mode range extending to V−, enabling precision buffering and integration in medical instrumentation and sensor front-ends.

For engineers reviewing the LMC6034IMX/NOPB datasheet, LMC6034IMX/NOPB pinout, LMC6034IMX/NOPB application, or LMC6034IMX/NOPB equivalent, key selection criteria include guaranteed 2.3μV/°C offset drift, 1.1V/μs slew rate at ±7.5V, 22nV/√Hz input voltage noise, and validated operation with 600Ω loads - critical for high-fidelity analog acquisition paths requiring long-term stability and minimal loading error.

Technical Context

The LMC6034IMX/NOPB employs a proprietary CMOS front-end architecture that enables input common-mode voltage to reach V− while maintaining ultra-low input bias current (40fA typ). Its output stage supports rail-to-rail swing under 2kΩ and 600Ω loads, with sourcing/sinking asymmetry compensated via an additional gain stage to sustain >100V/mV open-loop gain even at heavy loads.

Unlike conventional op amps, it features differential front-end topology with dedicated ultra-low-bias input transistors and integrated compensation for capacitive load tolerance up to 100pF when used with series output resistors (50–100Ω) and feedback capacitors (5–10pF), making it suitable for driving ADC input buffers and sample-and-hold circuits without oscillation.

Key Specifications

Pinout & Package

LMC6034IMX/NOPB is supplied in a 14-pin SOIC (D package) with standard quad op amp pinout and thermal resistance R_θJA = 115°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad CMOS op amp applications.

Compared with LMC6034IMX/NOPB, LMC6044IMX/NOPB trades higher quiescent current for 20× lower input bias current, while OPA2333PWR sacrifices input impedance and bandwidth to achieve near-zero offset drift - making LMC6034IMX/NOPB the optimal balance for high-Z, medium-bandwidth, low-drift applications like medical sensor buffering and precision integrators.

Availability

LMC6034IMX/NOPB is available at Aetrix Electronics and suitable for medical instrumentation, sensor signal conditioning, and precision analog data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LMC6034IMX/NOPB 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 50 years of innovation in precision linear ICs.

The LMC603x family was designed specifically for ultra-high-input-impedance, low-drift analog signal conditioning in single-supply medical, industrial, and test equipment - prioritizing bias current, offset stability, and load-drive capability over raw speed.

FAQ

What is the maximum capacitive load the LMC6034IMX/NOPB can drive without oscillation?

The LMC6034IMX/NOPB can reliably drive up to 50pF capacitive load in unity-gain follower configuration without external compensation. For loads exceeding 50pF - such as ADC input capacitors or long PCB traces - a 50Ω series resistor at the output combined with a 5pF feedback capacitor from output to inverting input restores phase margin and prevents oscillation, as verified in TI's SNOS609D datasheet Figure 6-3.

Does the LMC6034IMX/NOPB support true rail-to-rail output swing?

The LMC6034IMX/NOPB does not provide rail-to-rail output swing. At 5V supply with 2kΩ load, its output swings from 0.10V above V− to 4.87V below V+, and at 15V supply, from 0.26V to 14.63V. This 100–200mV headroom is consistent across temperature and load conditions, enabling robust interfacing with mid-supply-referenced ADCs but requiring level-shifting for full 0–5V digital logic compatibility.

How does the input common-mode range of the LMC6034IMX/NOPB affect single-supply operation?

The LMC6034IMX/NOPB input common-mode range extends to V− and within 1.9V of V+, allowing direct connection of 0V-referenced sensors (e.g., thermocouples, pH electrodes) in single-supply systems without level-shifting circuitry. At 5V supply, inputs operate from –0.4V to +3.1V; this ground-inclusive range eliminates DC blocking capacitors and simplifies biasing in battery-powered instrumentation.

Can the LMC6034IMX/NOPB replace LM358 in existing designs?

The LMC6034IMX/NOPB is pin-compatible with LM358 in SOIC-14 packages and offers superior input impedance (>1TΩ vs. 0.3MΩ), lower offset drift (±2.3μV/°C vs. ±7μV/°C), and higher gain bandwidth (1.4MHz vs. 1.2MHz). However, its supply range (4.75–15.5V) is narrower than LM358's (3–32V), and it draws more current per amplifier (375μA vs. 700μA total for dual), so validation of supply margins and power budget is required before drop-in replacement.

What layout techniques are essential to achieve the specified 40fA input bias current in practice?

To realize the LMC6034IMX/NOPB's 40fA input bias current, implement guard rings surrounding all input pins and connected traces, held at the same potential as the inputs via low-impedance routing. Use clean FR-4 PCB with solder mask removed from guard areas, avoid conformal coating near inputs, and consider air-wiring input pins (bent upward) in ultra-high-impedance applications - as detailed in SNOS609D Section 6.3.1.