Texas Instruments LMC6034IM

Overview

LMC6034IM 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 2.3μV/°C offset drift - enabling precision DC-coupled amplification in medical instrumentation, long-term integrators, and current-to-voltage converters.

For engineers reviewing the LMC6034IM datasheet, LMC6034IM pinout, LMC6034IM application, or LMC6034IM equivalent, key selection criteria include guaranteed 600Ω load drive capability, rail-to-rail input common-mode range (including V−), 1.1V/μs slew rate at ±7.5V, and 22nV/√Hz input voltage noise density - all specified across –40°C to +85°C.

Technical Context

The LMC6034IM uses a proprietary CMOS front-end topology with differential input stage and rail-to-rail output stage, enabling operation with input common-mode voltage extending to V− and output swing within 0.25V of rails under 2kΩ load. Its ultra-low input bias current (40fA typ.) is achieved via guarded input transistors and high-impedance gate oxide design.

Unlike conventional op amps, the LMC6034IM maintains stable gain bandwidth product (1.4MHz) and phase margin (50°) while driving capacitive loads up to 100pF when compensated with series output resistor and feedback capacitor - critical for sample-and-hold and filter applications requiring minimal settling error.

Key Specifications

Pinout & Package

LMC6034IM is supplied in 14-pin SOIC (D package) with standard JEDEC outline and 1.27mm pitch. Thermal resistance θ_JA = 115°C/W enables continuous operation at 85°C ambient with ≤300mW total dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2464IDR and OPA4188AIDR, the LMC6034IM uniquely balances femtoampere input bias, 1.1V/μs slew, and guaranteed 600Ω load drive - making it irreplaceable in long-duration, high-impedance analog signal chains where both DC precision and AC fidelity are mandatory.

Availability

LMC6034IM is available at Aetrix Electronics and suitable for medical instrumentation, precision data acquisition, and industrial sensor signal conditioning requiring stable component supply across extended production lifecycles.

Supply support for LMC6034IM 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 op amp innovation and manufacturing excellence.

The LMC6034IM belongs to TI's precision CMOS op amp family designed specifically for ultra-high-input-impedance, low-drift applications in medical, test equipment, and scientific instrumentation markets.

FAQ

What is the maximum capacitive load the LMC6034IM can drive without oscillation?

The LMC6034IM remains stable with ≥100pF capacitive loads when compensated with a 50Ω–100Ω series resistor at the output and a 5pF–10pF feedback capacitor from output to inverting input. Uncompensated, oscillation may occur above ~30pF in unity-gain follower configuration - verified in Figure 5-13 through Figure 5-16 of the SNOS609D datasheet. This behavior is consistent across all four channels of the LMC6034IM.

Does the LMC6034IM support true rail-to-rail input operation?

Yes - the LMC6034IM input common-mode voltage range extends to V− and within 1.9V of V+, as confirmed in Section 5.6 Electrical Characteristics (VCM specification). This allows direct interfacing with sensors referenced to ground in single-supply systems. The LMC6034IM achieves this via a specialized CMOS input stage that avoids PMOS/NMOS crossover distortion, unlike many "rail-to-rail input" op amps that degrade CMRR near supply rails.

Can the LMC6034IM replace LM358 in existing designs?

The LMC6034IM is pin-compatible with LM358-based quad layouts (SOIC-14), but requires validation of supply voltage (LMC6034IM max 15.5V vs LM358's 32V) and layout adaptation for ultra-low bias current (guard rings, air wiring). While it improves bandwidth (1.4MHz vs 1MHz) and input resistance (>1TΩ vs 2MΩ), its lower output current (±22mA vs ±40mA) limits drive capability. Direct replacement is feasible only in low-load, precision-focused upgrades of the LMC6034IM.

What is the guaranteed minimum open-loop gain of LMC6034IM into 600Ω load?

The LMC6034IM guarantees ≥75V/mV (37.5dB) open-loop gain into 600Ω loads at TA = –40°C to +85°C, per Section 5.6 Electrical Characteristics (AOL row, "Sourcing… RL = 600Ω"). This is 2× higher than typical CMOS op amps at same load, enabling <0.01% gain error in precision gain stages. The LMC6034IM maintains this performance across its full operating temperature range without derating.

How does the LMC6034IM's input bias current compare to TLC272?

The LMC6034IM specifies 40fA typical input bias current - over 1000× lower than TLC272's 10pA typical value. This difference directly enables applications like femtoampere current measurement and decade-long integrator stability, where TLC272's bias current would dominate error. The LMC6034IM achieves this via TI's advanced CMOS process with guarded input structures, as stated in the device description section of the SNOS609D datasheet.