STMicroelectronics LM833DT

Overview

LM833DT from STMicroelectronics is a dual low-noise operational amplifier optimized for high-fidelity audio signal conditioning. It delivers 4.5 nV/√Hz input voltage noise, 15 MHz gain bandwidth product, and 7 V/µs slew rate, enabling clean amplification in preamplifier and active filter stages of consumer and professional audio equipment.

For engineers reviewing the LM833DT datasheet, LM833DT pinout, LM833DT application, or LM833DT equivalent, key selection criteria include its 0.002% THD at 20 Hz–20 kHz, ±12 V common-mode input range, dual-channel channel separation of 120 dB, and SO-8 package compatibility with space-constrained PCB layouts.

Technical Context

The LM833DT employs bipolar input transistors to achieve ultra-low voltage noise and high open-loop gain (100 dB), supporting stable closed-loop operation up to 15 MHz with 60° phase margin. Its dual-amplifier architecture shares a single die with matched thermal and electrical characteristics across channels.

Designed for ±2.5 V to ±15 V split-supply operation, it maintains rail-to-rail output swing capability (±13.7 V into 2 kΩ) and exhibits robust immunity to supply variation (105 dB SVR) and common-mode interference (100 dB CMR) over –40 °C to +105 °C.

Key Specifications

Pinout & Package

LM833DT is housed in an SO-8 surface-mount plastic micropackage (ECOPACK® compliant), measuring 4.90 mm × 6.00 mm × 1.75 mm with 1.27 mm lead pitch. The package supports reflow soldering and meets RoHS requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NE5532DR and OPA2134PA, the LM833DT offers the best balance of low voltage noise, SO-8 footprint, and cost for dual-channel audio signal chains operating from ±12 V supplies, especially where THD <0.003% and channel isolation >115 dB are mandatory.

Availability

LM833DT is available at Aetrix Electronics and suitable for professional audio mixers, Hi-Fi preamplifiers, and active crossover networks requiring stable component supply across extended production lifecycles.

Supply support for LM833DT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The LM833 belongs to ST's precision analog amplifier product line, engineered specifically for high-fidelity audio signal processing where low noise, low distortion, and channel matching are critical system requirements.

FAQ

What is the maximum recommended supply voltage for continuous operation of LM833DT?

The absolute maximum supply voltage is ±18 V or +36 V total, but ST specifies safe continuous operation between ±2.5 V and ±15 V. Operating beyond ±15 V risks exceeding junction temperature limits under load and voids parametric guarantees in the datasheet, including THD and output swing performance.

Does LM833DT require external compensation for unity-gain stability?

No - the LM833DT is internally compensated for unity-gain stability, as confirmed by its 60° phase margin and flat gain/phase response up to 1 MHz in Figure 8. No external capacitors or feedback network adjustments are needed for stable operation at AV = +1 or –1 configurations.

Can LM833DT drive 600 Ω professional audio loads directly?

Yes - the LM833DT delivers ±10 V output swing into 600 Ω (per Figure 3), meeting AES3 and EBU standard line-driving requirements. However, sustained 600 Ω loading increases power dissipation; thermal derating above +70 °C ambient is advised for continuous full-scale operation.

How does the LM833DT's input common-mode range compare to rail-to-rail op-amps?

The LM833DT supports ±12 V input common-mode range with ±15 V supplies - i.e., 3 V below each rail. Unlike rail-to-rail input op-amps, it cannot accept signals within 1.5 V of either supply rail, limiting use in single-supply or low-headroom designs unless level-shifted via resistive networks or external biasing.