Texas Instruments OPA1642AIDGKR

Overview

OPA1642AIDGKR from Texas Instruments is a dual-channel, JFET-input audio operational amplifier optimized for high-fidelity signal conditioning in professional and consumer audio systems. It delivers 5.1 nV/√Hz input voltage noise, 0.00005% THD+N at 1 kHz, 20 V/μs slew rate, ±2.25 V to ±18 V supply operation, and rail-to-rail output swing - enabling low-distortion pre-amplification and line-driver stages in analog mixing consoles and broadcast equipment.

For engineers reviewing the OPA1642AIDGKR datasheet, OPA1642AIDGKR pinout, OPA1642AIDGKR application, or OPA1642AIDGKR equivalent, key selection criteria include its ultralow distortion under 2-kΩ load, phase-reversal immunity across full common-mode range, EMI rejection up to 96.6 dB at 5 GHz, and validated performance from –40°C to +85°C in VSSOP-8 packaging.

Technical Context

The OPA1642AIDGKR employs a true JFET-input front-end with <2 pA input bias current and an output stage engineered for rail-to-rail swing without phase reversal - even when inputs exceed the specified common-mode range. Its 11-MHz gain-bandwidth product and 20-V/μs slew rate support wideband audio fidelity up to 20 kHz with minimal group delay.

Internal current limiting (±30–36 mA) protects against short-circuit faults, while extremely stable input capacitance (<6 pF common-mode, <8 pF differential) ensures predictable high-frequency stability in active filter and tone-control circuits. The dual-channel architecture features fully independent circuitry to achieve –126 dB channel separation at 1 kHz.

Key Specifications

Pinout & Package

VSSOP-8 package (3.00 mm × 3.00 mm body, 0.65 mm pitch), thermally enhanced for audio-grade thermal stability in space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA1642AIDGKR, OPA1612AIDR trades higher power for lower noise in single-supply systems, while NE5532DR offers lower cost and wider availability at the expense of distortion, EMI rejection, and phase-reversal safety - making OPA1642AIDGKR optimal for new high-fidelity dual-supply designs requiring guaranteed audio transparency.

Availability

OPA1642AIDGKR is available at Aetrix Electronics and suitable for professional audio equipment, analog mixing consoles, and broadcast studio equipment requiring stable component supply across extended production lifecycles.

Supply support for OPA1642AIDGKR 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 and embedded processing technologies, with decades of leadership in precision op-amp design.

The OPA164x family was developed specifically for high-end audio signal chains - emphasizing ultralow distortion, JFET-input stability at high source impedances, and robustness against real-world EMI and overvoltage conditions.

FAQ

What is the maximum capacitive load the OPA1642AIDGKR can drive without instability?

The OPA1642AIDGKR maintains stability driving up to 100 pF with appropriate series output resistance (e.g., 24 Ω). Figure 19 in the datasheet shows <10% overshoot at 100-pF load with 24-Ω isolation resistor. For loads >100 pF, external compensation or a dedicated buffer stage is recommended to preserve phase margin and prevent ringing in audio band.

Does the OPA1642AIDGKR support single-supply operation?

Yes, the OPA1642AIDGKR operates from 4.5 V to 36 V single supply (e.g., 5 V, 12 V, 24 V) as well as ±2.25 V to ±18 V dual supply. Its rail-to-rail output and wide input common-mode range (to within 0.1 V of V– and 3.5 V below V+) enable true single-supply functionality in line-level and headphone driver applications.

What is the thermal resistance (RθJA) of the OPA1642AIDGKR in its VSSOP-8 package?

The OPA1642AIDGKR in DGK (VSSOP-8) package has a junction-to-ambient thermal resistance (RθJA) of 180°C/W under standard JEDEC test conditions. This value assumes a 2-layer PCB with minimal copper; actual thermal performance improves significantly with internal ground/power planes and thermal vias.

How does the OPA1642AIDGKR's EMI rejection compare to standard op-amps?

The OPA1642AIDGKR achieves 96.6 dB EMIRR IN+ at 5 GHz - exceeding typical audio op-amps by 20–40 dB. This is enabled by proprietary input-stage shielding and layout techniques that suppress RF rectification, preventing audible buzz or offset drift when placed near Wi-Fi/Bluetooth antennas or switching power supplies.

Is the OPA1642AIDGKR pin-compatible with other members of the OPA164x family?

Yes, the OPA1642AIDGKR (dual, VSSOP-8) shares identical pinout with the OPA1641 (single, VSSOP-8) and OPA1644 (quad, TSSOP-14 is incompatible). This allows direct substitution in dual-channel layouts, though channel count and package footprint must be verified for each variant.