Texas Instruments LM833MMX/NOPB

Overview

LM833MMX/NOPB from Texas Instruments is a dual audio operational amplifier optimized for high-fidelity preamplifier and line-level signal conditioning stages, featuring 4.5 nV/√Hz input noise voltage, 7 V/μs slew rate (typ), and 15 MHz gain bandwidth product (typ). It delivers 0.002% THD at 20–20 kHz and operates across ±15 V supplies with −40°C to +85°C temperature range.

For engineers reviewing the LM833MMX/NOPB datasheet, LM833MMX/NOPB pinout, LM833MMX/NOPB application, or LM833MMX/NOPB equivalent, key selection criteria include low-noise audio performance, internal unity-gain stability, wide power bandwidth (120 kHz), and VSSOP-8 packaging for space-constrained PCB layouts in professional audio equipment.

Technical Context

The LM833MMX/NOPB employs internally compensated bipolar transistor architecture delivering high open-loop gain (>110 dB) and 60° phase margin across all closed-loop gains. Its design eliminates external compensation components while maintaining stability with capacitive loads up to 50 pF.

It achieves low distortion via matched differential pair topology and precision biasing, enabling RIAA/NAB phono preamp, tone control, and balanced-to-single-ended conversion without external trimming. Input common-mode range extends to ±14 V with ±15 V supplies, supporting rail-to-rail signal handling in analog audio paths.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 1.1 mm max height, 0.65 mm lead pitch, exposed thermal pad for improved power dissipation in compact audio PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual audio operational amplifier applications.

Compared with NE5532DR and OPA2134PA, the LM833MMX/NOPB offers optimal balance of low noise, internal stability, and VSSOP-8 footprint for space-limited audio PCBs-making it the preferred choice for production-grade stereo preamp and line driver modules where layout density and design simplicity are critical.

Availability

LM833MMX/NOPB is available at Aetrix Electronics and suitable for professional audio equipment, studio monitor systems, and high-fidelity consumer electronics requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.

Supply support for LM833MMX/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 power management ICs, with decades of expertise in high-performance audio signal chain solutions.

The LM833 series was developed specifically for high-fidelity audio applications demanding low noise, wide dynamic range, and robust stability-targeting phono preamps, tone controls, and line-level signal conditioning in consumer and pro-audio gear.

FAQ

What is the maximum capacitive load the LM833MMX/NOPB can drive without instability?

The LM833MMX/NOPB maintains stable operation with capacitive loads up to 50 pF without requiring external isolation resistors. This capability simplifies interface design to cables, filters, and ADC inputs. For loads exceeding 50 pF, a series resistor (typically 10–100 Ω) must be placed at the output to preserve phase margin. The LM833MMX/NOPB's 60° phase margin ensures reliable behavior even under marginal loading conditions.

Does the LM833MMX/NOPB support single-supply operation?

The LM833MMX/NOPB is specified for dual-supply operation (±5 V to ±18 V) and does not support true single-supply use due to limited input common-mode range (±12 V min) and output swing limitations near ground. While it may function with split-rail virtual ground circuits, TI does not characterize or guarantee performance in single-supply configurations. For dedicated single-supply audio op-amps, consider the TLV27x or OPA16x families instead of the LM833MMX/NOPB.

How does the LM833MMX/NOPB compare to the LM833N/NOPB in terms of performance and packaging?

The LM833MMX/NOPB and LM833N/NOPB share identical electrical specifications-including 4.5 nV/√Hz noise, 7 V/μs slew rate, and 15 MHz GBW-but differ in package and thermal performance. The LM833MMX/NOPB uses VSSOP-8 (DGK) with 3.0 mm × 3.0 mm footprint and exposed thermal pad, while LM833N/NOPB uses PDIP-8. The VSSOP variant enables higher board density and better thermal dissipation in surface-mount audio PCBs, making LM833MMX/NOPB the preferred choice for modern compact designs.

Is the LM833MMX/NOPB pin-compatible with other industry-standard dual op-amps?

Yes-the LM833MMX/NOPB is pin-for-pin compatible with standard dual op-amps in VSSOP-8 packages, including the NE5532VSSOP and OPA2340DGK. Its pinout matches the industry-standard dual op-amp configuration (inverting/non-inverting inputs and outputs per channel, shared supplies), allowing direct substitution in existing layouts without PCB revision. However, verify noise, slew rate, and supply current requirements match your design before replacement.

What is the typical input-referred noise voltage of the LM833MMX/NOPB at 1 kHz?

The LM833MMX/NOPB has a typical input-referred noise voltage of 4.5 nV/√Hz at 1 kHz, measured with RS = 100 Ω. This value is confirmed in the DESIGN ELECTRICAL CHARACTERISTICS table of the official TI datasheet (SNOSBD8E). At audio frequencies, this translates to <0.38 μV total integrated noise (20 Hz–20 kHz, A-weighted), making the LM833MMX/NOPB suitable for low-noise phono and line-level amplification where signal integrity is critical.