Texas Instruments LMC6442IN/NOPB

Overview

LMC6442IN/NOPB from Texas Instruments is a dual micropower rail-to-rail output operational amplifier optimized for single-supply battery-powered systems, delivering 0.95 µA/amplifier supply current, 9.5 kHz gain-bandwidth product, and output swing within 30 mV of both rails at 2.2 V supply-enabling precision signal conditioning in smoke detectors and portable instrumentation.

For engineers reviewing the LMC6442IN/NOPB datasheet, LMC6442IN/NOPB pinout, LMC6442IN/NOPB application, or LMC6442IN/NOPB equivalent, key selection criteria include ultra-low quiescent current, guaranteed operation down to 1.8 V, rail-to-rail output capability, input common-mode range extending to −0.3 V, and stability at closed-loop gains ≥+2 or ≤−1 without external compensation.

Technical Context

The LMC6442IN/NOPB employs CMOS input stage architecture with 5 fA typical input bias current and operates across 1.8 V to 11 V supply range. Its rail-to-rail output stage uses complementary MOSFETs to achieve 22 mV maximum saturation voltage near V− and 20 mV near V+ at 5 V supply.

Designed for closed-loop gains ≥+2 (or ≤−1), it achieves 63°–68° phase margin across 2.2 V–10 V supplies and supports unity-gain operation only with external RC compensation. It drives capacitive loads up to 300 pF when compensated, and exhibits immunity to output phase reversal even when inputs exceed common-mode limits.

Key Specifications

Pinout & Package

LMC6442IN/NOPB is housed in an 8-pin PDIP (Plastic Dual In-line Package) with 0.3-inch body width and standard through-hole mounting footprint (Package Number P0008E). Lead finish is NiPdAu, MSL rating is Level-1 (unlimited), and operating temperature range is −40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual micropower op-amp applications.

Compared with TLV2462IP and LPV521MG/NOPB, the LMC6442IN/NOPB uniquely balances sub-1 µA/amplifier consumption, dual-channel integration, guaranteed 2.2 V operation, and rail-to-rail output-making it optimal for space-constrained, long-life, single-supply safety and sensing systems where both channels must operate identically under tight power constraints.

Availability

LMC6442IN/NOPB is available at Aetrix Electronics and suitable for smoke/gas detectors, portable instrumentation, occupancy sensors, and thermostats requiring stable component supply with long-term industrial lifecycle support.

Supply support for LMC6442IN/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 decades of heritage in precision op-amps and low-power signal chain solutions.

The LMC6442IN/NOPB belongs to TI's micropower precision op-amp family, engineered specifically for battery-critical applications including life-safety systems, portable medical devices, and energy-harvesting sensor nodes.

FAQ

What is the minimum supply voltage for reliable operation of the LMC6442IN/NOPB?

The LMC6442IN/NOPB is specified to operate reliably from 1.8 V to 11 V. At 1.8 V, it maintains rail-to-rail output swing and functional amplification, though gain-bandwidth product reduces to ~8 kHz. Full performance-including 9.5 kHz GBWP and 0.95 µA/amplifier supply current-is ensured from 2.2 V onward per the datasheet's 2.2 V Electrical Characteristics table.

Can the LMC6442IN/NOPB drive capacitive loads without oscillation?

The LMC6442IN/NOPB is stable into purely resistive loads at gains ≥+2 or ≤−1 without compensation. For capacitive loads, external RC compensation (as shown in Figure 35 of the datasheet) enables stable operation into up to 300 pF. Without compensation, capacitive loading degrades phase margin and may cause overshoot or ringing-especially near V− rail.

Does the LMC6442IN/NOPB support true rail-to-rail input?

No-the LMC6442IN/NOPB features rail-to-rail *output* but not rail-to-rail *input*. Its input common-mode voltage range extends from −0.3 V to V+ − 0.9 V, meaning it accepts inputs down to 0.3 V below ground (enabling ground-sensing) but cannot accept signals within 0.9 V of V+. This differs from true rail-to-rail input op-amps like the LPV821.

What is the typical input bias current of the LMC6442IN/NOPB, and why does it matter?

The LMC6442IN/NOPB has a typical input bias current of 5 fA-among the lowest available for dual op-amps. This enables accurate amplification of signals from ultra-high-impedance sources such as pH electrodes, photodiodes, or piezoelectric sensors, where even picoamp-level leakage would introduce significant offset or drift.

Is the LMC6442IN/NOPB pin-compatible with other dual op-amps in PDIP-8 packages?

The LMC6442IN/NOPB follows the industry-standard dual op-amp pinout for PDIP-8 (Pin 1: A-invert, Pin 2: A-noninv, Pin 3: A-out, Pin 4: V−, Pin 5: B-noninv, Pin 6: B-invert, Pin 7: B-out, Pin 8: V+), matching LM358, TL072, and MCP6022. However, electrical behavior-including supply current, input range, and stability-differs significantly; direct substitution requires validation of biasing, gain, and load conditions.