Texas Instruments LMP7732MM/NOPB

Overview

LMP7732MM/NOPB from Texas Instruments is a dual, rail-to-rail input/output, low-noise operational amplifier optimized for precision sensor signal conditioning in battery-powered and space-constrained systems. It delivers 2.9 nV/√Hz input voltage noise at 1 kHz, 22 MHz gain bandwidth, 130 dB open-loop gain, ±1.5 nA input bias current, and operates from 1.8 V to 5.5 V supply - enabling high-fidelity photometric and medical instrumentation front-ends.

For engineers reviewing the LMP7732MM/NOPB datasheet, LMP7732MM/NOPB pinout, LMP7732MM/NOPB application, or LMP7732MM/NOPB equivalent, key selection criteria include ultra-low 1/f noise corner (3 Hz), rail-to-rail output swing within 13 mV of rails (at 2 kΩ load), CMRR ≥129 dB, THD+N ≤0.001% at 10 kHz, and guaranteed operation across −40°C to +125°C industrial temperature range.

Technical Context

The LMP7732MM/NOPB employs bipolar junction transistor (BJT) input stages with proprietary input bias current cancellation circuitry, achieving ±1.5 nA bias current while retaining low voltage noise - a rare combination typically found only in JFET or CMOS amplifiers. Its 1/f noise corner at 3 Hz ensures stable DC accuracy in slow-signal applications like gas analysis.

This dual op-amp features fully independent channels with matched AC/DC performance, rail-to-rail common-mode input range (0 V to V_S), and rail-to-rail output swing. It maintains 22 MHz GBW and 2.4 V/µs slew rate across 1.8–5.5 V supply, supporting high-gain, wideband closed-loop configurations without stability compromise.

Key Specifications

Pinout & Package

Package: 8-pin VSSOP (MM suffix), 3.0 mm × 3.0 mm body, 0.65 mm pitch - optimized for compact PCB layouts and thermal efficiency (θ_JA = 235°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, rail-to-rail op-amp applications.

Compared with OPA2189IDR and ADA4898-2ARMZ, the LMP7732MM/NOPB uniquely balances ultra-low 1/f noise (3 Hz corner), rail-to-rail operation down to 1.8 V, and 22 MHz bandwidth - making it the optimal choice for portable, precision, low-voltage sensor interfaces where both DC accuracy and AC fidelity are critical.

Availability

LMP7732MM/NOPB is available at Aetrix Electronics and suitable for gas analysis instruments, photometric instrumentation, medical instrumentation, portable battery-powered sensors, and industrial process monitoring requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for LMP7732MM/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 expertise in precision amplifiers and signal-chain solutions.

The LMP7732MM/NOPB belongs to TI's LMP™ precision amplifier family, engineered specifically for low-noise, low-voltage, rail-to-rail signal conditioning in sensor front-ends, medical devices, and portable instrumentation.

FAQ

What is the input voltage noise density of the LMP7732MM/NOPB at 1 kHz?

The LMP7732MM/NOPB has an input voltage noise density of 2.9 nV/√Hz at 1 kHz under typical conditions (V_S = 5 V, V_CM = 2.5 V). This value is confirmed across 2.5 V, 3.3 V, and 5 V supply voltages and remains stable over the full −40°C to +125°C operating temperature range. The 1/f noise corner is specified at 3 Hz, ensuring minimal low-frequency drift in DC-coupled applications.

Does the LMP7732MM/NOPB support true rail-to-rail input and output operation?

Yes, the LMP7732MM/NOPB supports rail-to-rail input (common-mode range from 0 V to V_S) and rail-to-rail output (swing within 13 mV of either rail at 2 kΩ load). This is achieved via parallel p-type and n-type input stages and a robust output stage topology. Performance is guaranteed across the full 1.8 V to 5.5 V supply range, with output swing degrading by less than 2 mV per 0.1 V supply reduction.

What is the maximum guaranteed supply current for the LMP7732MM/NOPB?

The maximum guaranteed supply current for the LMP7732MM/NOPB is 8.4 mA at V_S = 5 V and V_CM = 0.5 V, per the Electrical Characteristics table. At nominal 3.3 V operation and room temperature, typical supply current is 6.4 mA, and at 1.8 V it drops to 4.6 mA - enabling efficient operation in ultra-low-power designs without sacrificing bandwidth or noise performance.

Can the LMP7732MM/NOPB drive capacitive loads directly?

The LMP7732MM/NOPB is stable with capacitive loads up to 20 pF in unity-gain configuration, as verified by phase margin ≥60° and gain margin ≥12 dB in the datasheet. For larger capacitive loads (e.g., ADC input capacitance), a series isolation resistor (10–50 Ω) is recommended between the LMP7732MM/NOPB output and the load to maintain stability and prevent peaking or oscillation.

Is the LMP7732MM/NOPB pin-compatible with other devices in the LMP773x family?

Yes, the LMP7732MM/NOPB shares identical 8-pin SOIC and VSSOP pinouts with the LMP7731 (single-channel) and LMP7732 (dual-channel) variants. All share the same pin mapping: OUT A, −IN A, +IN A, V−, V+, −IN B, +IN B, OUT B. This enables direct footprint reuse across single/dual configurations during design scaling or BOM optimization.