Texas Instruments SM73302MFX/NOPB

Overview

SM73302MFX/NOPB from Texas Instruments is a decompensated, precision CMOS-input operational amplifier optimized for low-noise, high-speed signal conditioning at gains ≥10. It delivers 88 MHz gain-bandwidth product, 5.8 nV/√Hz input voltage noise at 1 kHz, and rail-to-rail output swing within 25 mV of rails (10 kΩ load) while consuming only 1.15 mA at 5 V. It operates from 1.8 V to 5.5 V and supports −40°C to +125°C industrial temperature range - ideal for photodiode transimpedance amplifiers and ADC front-ends.

For engineers reviewing the SM73302MFX/NOPB datasheet, SM73302MFX/NOPB pinout, SM73302MFX/NOPB application, or SM73302MFX/NOPB equivalent, key selection considerations include its minimum stable gain of 10 V/V, decompensated architecture requiring external lead-lag compensation for unity-gain use, ultra-low input bias current (100 fA), and SOT-23-5 package compatibility with space-constrained sensor interface layouts.

Technical Context

The SM73302MFX/NOPB employs a decompensated two-pole architecture with dominant pole at 1.6 kHz and second pole at 45 MHz, enabling 88 MHz GBW while maintaining 1.15 mA quiescent current. Its open-loop gain exceeds 98 dB (RL = 10 kΩ) and phase margin is <5° without external compensation below G = 10.

CMOS input stage provides 100 fA typical input bias current and input common-mode range extending to V−, supporting ground-sensing in single-supply configurations. Rail-to-rail output uses positive-feedback-enhanced push-pull stage capable of sourcing >40 mA at 1.8 V - but limits safe open-loop use as a comparator.

Key Specifications

Pinout & Package

SM73302MFX/NOPB is housed in a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, 2.9 mm × 1.6 mm footprint, and 1.0 mm height - compatible with standard pick-and-place and reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMP7715MF/NOPB and OPA377AIDBVR, SM73302MFX/NOPB delivers 5× higher bandwidth at same supply current but mandates gain ≥10 or external lead-lag compensation - making it optimal for high-fidelity, high-speed signal chains where layout discipline and compensation design effort are acceptable.

Availability

SM73302MFX/NOPB is available at Aetrix Electronics and suitable for photodiode amplification, precision ADC driving, and medical sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SM73302MFX/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, embedded processing, and connectivity technologies with over 50 years of innovation in precision signal chain solutions.

The SM73302MFX/NOPB belongs to TI's renewable-energy-grade precision amplifier family, engineered for high-speed, low-noise performance in harsh-environment sensor interfaces and energy-monitoring systems.

FAQ

What is the minimum stable gain for SM73302MFX/NOPB without external compensation?

The SM73302MFX/NOPB requires a minimum closed-loop gain of 10 V/V (20 dB) for unconditional stability without external compensation. This is due to its decompensated architecture, where the second pole occurs at 45 MHz and phase margin drops below 5° below G = 10. Operating at lower gains risks oscillation unless lead-lag compensation is applied per TI Application Report SNOSB93A.

Can SM73302MFX/NOPB operate from a 1.8 V supply across the full temperature range?

Yes, SM73302MFX/NOPB supports 1.8 V supply voltage for ambient temperatures from 0°C to +125°C. At −40°C to 0°C, minimum supply is 2.0 V per operating ratings. The device maintains rail-to-rail output swing and 1.15 mA supply current at 1.8 V, making it suitable for ultra-low-power sensor nodes powered by partially discharged lithium batteries.

Does SM73302MFX/NOPB have rail-to-rail input capability?

No, SM73302MFX/NOPB does not feature rail-to-rail input. Its input common-mode voltage range extends to V− (enabling ground-sensing in single-supply use) but only up to 1.5 V with 2.5 V supply and 4 V with 5 V supply - i.e., it excludes the positive rail. Input stage is CMOS-based, so differential input voltage must remain within ±0.3 V to avoid damage or parametric shift.

What is the maximum capacitive load SM73302MFX/NOPB can drive without instability?

SM73302MFX/NOPB can directly drive ≤20 pF capacitive loads while maintaining ≥45° phase margin at G = 10. For loads >20 pF (e.g., ADC input capacitance + PCB trace), TI recommends isolating the output with a series resistor (typically 10–50 Ω) placed adjacent to the SM73302MFX/NOPB output pin - verified in Figure 34 of SNOSB93A showing closed-loop output impedance vs. frequency.

Is SM73302MFX/NOPB suitable for use as a comparator?

No, SM73302MFX/NOPB is not recommended for comparator use. Its output stage employs positive feedback to enhance drive strength, causing slow recovery from saturation and undefined propagation delay in open-loop configurations. TI explicitly states in SNOSB93A that "usage of the SM73302 in an open-loop configuration is not recommended" - dedicated comparators like TLV3501 should be used instead.