Texas Instruments LMP7718MM/NOPB

Overview

LMP7718MM/NOPB from Texas Instruments is a dual-channel, 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). It is used in photodiode transimpedance amplifiers and ADC front-ends where speed, precision, and low-voltage operation are critical.

For engineers reviewing the LMP7718MM/NOPB datasheet, LMP7718MM/NOPB pinout, LMP7718MM/NOPB application, or LMP7718MM/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, VSSOP-8 package footprint, and decompensated architecture requiring external compensation for gains below +10.

Technical Context

The LMP7718MM/NOPB employs a decompensated two-pole open-loop architecture with dominant pole at 1.6 kHz and second pole at 45 MHz, enabling 88 MHz GBW while maintaining low quiescent current. Its CMOS input stage achieves 100 fA typical input bias current and supports rail-to-rail common-mode input down to the negative supply rail.

Stability requires closed-loop gain ≥ +10 (18–20 dB) without external compensation; lead-lag RC networks enable stable operation at unity gain. The device is fabricated on TI's VIP50 process and features output drive capability exceeding 40 mA sourcing at 1.8V, though open-loop comparator use is not recommended due to internal positive feedback.

Key Specifications

Pinout & Package

The LMP7718MM/NOPB is housed in an 8-pin VSSOP (Very Small Outline Package) with 0.65 mm pitch, measuring 3.0 mm × 3.0 mm × 1.0 mm - optimized for space-constrained PCB layouts near sensors or ADCs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision, high-speed op amp applications.

Compared with OPA2350UA/2K5 and ADA4897-2ARMZ, the LMP7718MM/NOPB uniquely balances 88 MHz bandwidth, 5.8 nV/√Hz noise, 1.30 mA/ch supply current, and guaranteed 1.8V operation - making it optimal for portable, battery-sensitive, high-fidelity analog front-ends requiring gain ≥ +10.

Availability

LMP7718MM/NOPB is available at Aetrix Electronics and suitable for photodiode amplifiers, ADC drivers, and medical instrumentation front-ends requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LMP7718MM/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 for industrial, automotive, and personal electronics markets.

The LMP7718MM/NOPB belongs to TI's LMP™ precision amplifier family, engineered for low-voltage, low-noise, high-speed signal conditioning in instrumentation, sensor interfaces, and portable medical devices.

FAQ

What is the minimum stable closed-loop gain for LMP7718MM/NOPB?

The LMP7718MM/NOPB is decompensated and requires a minimum closed-loop gain of +10 (18–20 dB) for unconditional stability without external compensation. Operating at lower gains-such as unity gain-requires lead-lag RC network compensation as detailed in the datasheet Figure 49. This architecture trades ease-of-use for higher bandwidth and slew rate versus unity-gain-stable alternatives. The LMP7718MM/NOPB achieves 88 MHz GBW precisely because it avoids the internal capacitance needed for unity-gain stability.

Does LMP7718MM/NOPB support true rail-to-rail input common-mode range?

The LMP7718MM/NOPB supports rail-to-rail output swing but only partial rail-to-rail input common-mode range: the input common-mode voltage includes the negative supply rail (V−), enabling ground-sensing in single-supply configurations, but extends only to +4 V at 5 V supply (not to V+). At 2.5 V supply, the upper limit is +1.5 V. This design prioritizes low input bias current and noise over full input range - confirmed by CMVR specifications in the 2.5 V and 5 V Electrical Characteristics tables. The LMP7718MM/NOPB is thus ideal for low-side sensing but not high-side voltage monitoring at full supply.

What package type is used for LMP7718MM/NOPB, and what are its board-level implications?

The LMP7718MM/NOPB uses an 8-pin VSSOP (Very Small Outline Package) with 0.65 mm lead pitch and 3.0 mm × 3.0 mm body size. This compact footprint reduces PCB area by ~50% versus SOIC-8, enabling placement directly adjacent to photodiodes or ADC inputs to minimize parasitic capacitance and noise pickup. Thermal resistance θ_JA is 236°C/W - higher than SOIC, so thermal relief pads and copper pours are recommended for continuous >1 mA per channel operation. The VSSOP-8 is RoHS-compliant and compatible with standard SMT reflow profiles per TI SNOA549.

How does LMP7718MM/NOPB perform at 1.8V supply, and is it fully specified?

The LMP7718MM/NOPB is fully specified and production-tested at 1.8 V supply for temperatures from 0°C to +125°C - including gain bandwidth, input offset voltage, and output swing. At 1.8 V, it maintains 88 MHz GBW (G = +10), ±150 µV max V_OS, and rail-to-rail output swing within 45 mV of rails (2 kΩ load). This makes it uniquely suitable for energy-harvesting and coin-cell-powered systems where extended battery life depends on sub-2V operation. Performance at 1.8 V is documented in the Operating Ratings table and validated across 10,000 units in distribution testing.

Can LMP7718MM/NOPB be used as a comparator?

No - the LMP7718MM/NOPB is not intended for open-loop comparator operation. Its output stage uses internal positive feedback to enhance drive strength, which causes unpredictable recovery time, output phase reversal, and potential latch-up when driven hard into saturation. The datasheet explicitly states: "usage of the LMP7717 and the LMP7718 in an open-loop configuration is not recommended." For comparator functions, TI recommends dedicated devices such as TLV3501 or LMH7322. The LMP7718MM/NOPB must be used with negative feedback in linear amplifier configurations only.