Texas Instruments LMP7718MAX/NOPB

Overview

LMP7718MAX/NOPB from Texas Instruments is a dual, decompensated, precision CMOS-input operational amplifier optimized for high-speed, low-noise signal conditioning in 1.8V–5.5V systems. It delivers 88 MHz gain bandwidth at G = +10, 5.8 nV/√Hz input voltage noise, ±150 µV max input offset voltage, and rail-to-rail output swing within 25 mV of either rail (10 kΩ load), enabling high-fidelity ADC interface and photodiode amplification.

For engineers reviewing the LMP7718MAX/NOPB datasheet, LMP7718MAX/NOPB pinout, LMP7718MAX/NOPB application, or LMP7718MAX/NOPB equivalent, key selection considerations include its minimum stable gain of +10, 1.30 mA per channel supply current, −40°C to 125°C operating range, SOIC-8 package compatibility, and decompensated architecture requiring external compensation for unity-gain stability.

Technical Context

The LMP7718MAX/NOPB uses TI's VIP50 CMOS process to achieve femtoampere-level input bias current (100 fA) and ground-sensing input common-mode range (−0.3 V to V+ − 0.3 V). Its decompensated internal architecture places the dominant pole at 1.6 kHz and second pole at 45 MHz, enabling 88 MHz GBW while maintaining low quiescent power.

Stability requires closed-loop gain ≥ +10 (18–20 dB) without external compensation; lead-lag RC networks enable stable operation down to G = ±1. Output stage employs positive feedback to sustain >40 mA sourcing capability at 1.8 V, but limits open-loop comparator use due to enhanced drive strength.

Key Specifications

Pinout & Package

Package: 8-Pin SOIC (Small Outline Integrated Circuit), 3.90 mm × 4.90 mm body, 1.27 mm pitch, surface-mount, RoHS-compliant (NOPB suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA211AIDR and LMP7717MAX/NOPB, the LMP7718MAX/NOPB offers the highest bandwidth-per-milliamp (67.7 MHz/mA), making it optimal for space-constrained, battery-operated systems needing dual-channel, decompensated speed without sacrificing precision.

Availability

LMP7718MAX/NOPB is available at Aetrix Electronics and suitable for ADC interface, photodiode amplification, active filter design, medical instrumentation, and low-voltage sensor signal conditioning requiring stable component supply across automotive, industrial, and portable electronics programs.

Supply support for LMP7718MAX/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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog ICs and manufacturing excellence.

The LMP™ precision amplifier family-including the LMP7718MAX/NOPB-is engineered for low-voltage, low-noise, high-speed instrumentation applications where femtoampere bias current, rail-to-rail output, and decompensated bandwidth are critical system requirements.

FAQ

What is the minimum stable gain for LMP7718MAX/NOPB without external compensation?

The LMP7718MAX/NOPB requires a minimum closed-loop gain of +10 (20 dB) for unconditional stability without external compensation. This is due to its decompensated internal architecture, which places the second pole at 45 MHz. Operating below G = +10 risks oscillation unless a lead-lag RC network is added to reshape the loop gain phase margin. The LMP7718MAX/NOPB datasheet explicitly states G ≥ +10 as the stability boundary.

Does LMP7718MAX/NOPB support true rail-to-rail input operation?

No, the LMP7718MAX/NOPB does not support rail-to-rail input. Its input common-mode voltage range extends to V− (ground) but only up to V+ − 0.3 V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. While this "ground-sensing" capability enables single-supply operation with signals referenced to ground, it cannot accept inputs at the positive rail. The LMP7718MAX/NOPB output, however, is fully rail-to-rail.

What is the maximum capacitive load the LMP7718MAX/NOPB can drive without instability?

The LMP7718MAX/NOPB can safely drive up to 100 pF with proper PCB layout and local 0.1 µF supply decoupling. For loads >50 pF, TI recommends adding a small series resistor (10–50 Ω) between the output and capacitive load to isolate the amplifier's output impedance from the reactive load. Stability testing with the exact load and layout is advised, as phase margin erodes above 100 pF without isolation.

Is LMP7718MAX/NOPB suitable for use as a comparator?

No, the LMP7718MAX/NOPB is not recommended for open-loop comparator operation. Its output stage uses positive feedback to enhance current drive, which degrades response predictability and increases propagation delay variability in saturation. Additionally, the decompensated architecture lacks internal hysteresis and exhibits slow recovery from deep saturation. For comparator functions, TI recommends dedicated devices such as TLV3501 or LMH7322 instead of the LMP7718MAX/NOPB.

How does the 1.8 V operation specification differ from the 2.5 V/5.0 V performance guarantees for LMP7718MAX/NOPB?

The LMP7718MAX/NOPB is fully characterized and production-tested at 2.5 V and 5.0 V across −40°C to +125°C. At 1.8 V, operation is ensured only from 0°C to +125°C-not down to −40°C-and certain parameters (e.g., slew rate, output swing) are not tested or guaranteed. The 1.8 V mode enables ultra-low-power battery applications but trades off guaranteed parametric performance at cold temperatures. All 1.8 V operation data for the LMP7718MAX/NOPB appear in typical performance curves, not min/max limits.