Texas Instruments INA1620RTWT

Overview

INA1620RTWT from Texas Instruments is a dual-channel, high-fidelity audio operational amplifier with integrated thin-film resistor pairs and on-chip EMI filters. It delivers ultra-low THD+N (–119.2 dB at 1 kHz, 142 mW into 32 Ω), 2.8 nV/√Hz input voltage noise, and 32 MHz gain-bandwidth product at G = +1000 - enabling precision headphone driver and professional audio signal conditioning circuits.

For engineers reviewing the INA1620RTWT datasheet, INA1620RTWT pinout, INA1620RTWT application, or INA1620RTWT equivalent, key selection criteria include matched resistor pair tolerance (0.004% typ), dual-channel crosstalk (140 dB at 1 kHz), shutdown current (5 µA/channel), ±2 V to ±18 V supply range, and 24-pin WQFN thermal-pad package compatibility with high-density PCB layouts.

Technical Context

The INA1620RTWT integrates two bipolar-input op amps with four independent 1-kΩ thin-film resistor pairs (R1–R4), each with center-tap (X-B) and end-point (X-A/X-C) terminals. Its single-gain-stage architecture achieves 136 dB open-loop gain into 600-Ω loads while maintaining 10 V/μs slew rate and >600 pF capacitive-load drive capability.

EMI filtering is implemented via on-die RC networks tied to IN+ A/B and IN− A/B pins, with corner frequency specified at 500 MHz. The enable circuit uses ground-referenced logic thresholds (VIH = 0.82 V, VIL = 0.78 V) and actively suppresses pop-and-click transients during shutdown entry/exit.

Key Specifications

Pinout & Package

INA1620RTWT is housed in a 4.00 mm × 4.00 mm, 24-pin WQFN package with exposed thermal pad connected to VEE (negative supply). The package supports high-power dissipation (RθJB = 13.1 °C/W) and requires solder paste stencil optimization for thermal pad void control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA1612AIDR and LM4562MF/NOPB, the INA1620RTWT uniquely combines matched thin-film resistors, on-die EMI filtering, and ultra-low THD+N in a thermally optimized 24-pin WQFN - reducing BOM count, PCB area, and susceptibility to RF ingress in high-end audio systems.

Availability

INA1620RTWT is available at Aetrix Electronics and suitable for high-fidelity headphone drivers, professional audio mixing consoles, and analog audio test equipment requiring stable component supply, consistent parametric performance across production lots, and long-term lifecycle support.

Supply support for INA1620RTWT 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 and audio signal chain innovation.

The INA1620RTWT belongs to TI's high-fidelity audio op amp product line, engineered specifically for applications demanding ultra-low distortion, integrated precision passives, and robust EMI immunity in space-constrained professional and consumer audio systems.

FAQ

What is the maximum capacitive load the INA1620RTWT can drive stably?

The INA1620RTWT maintains stable operation with >600 pF capacitive load, as verified in Figure 24 of the SBOS859B datasheet. This capability enables direct driving of long cables, multi-pole filters, or multiple downstream inputs without external isolation resistors - critical for maintaining phase integrity in studio monitor outputs and headphone amplifier stages using the INA1620RTWT.

How does the INA1620RTWT achieve pop-and-click suppression during shutdown?

The INA1620RTWT uses an active enable circuit that sequences the bias and output stage transitions to prevent voltage transients. When entering or exiting shutdown mode, the circuit holds the output at midsupply before disconnecting the input stage - eliminating audible artifacts. This behavior is intrinsic to the INA1620RTWT's internal architecture and requires no external timing components or firmware intervention.

Can the integrated thin-film resistors in the INA1620RTWT be used independently of the amplifiers?

Yes - the four 1-kΩ thin-film resistor pairs (R1–R4) in the INA1620RTWT operate independently of the amplifier core. They retain their 0.004% matching and ±0.07 ppm/°C drift performance regardless of whether the op amps are enabled or in shutdown, provided the device is powered and voltages remain within ±0.5 V of the supply rails to avoid forward-biasing ESD diodes.

What is the thermal pad connection requirement for the INA1620RTWT WQFN package?

The exposed thermal pad on the INA1620RTWT must be soldered to a PCB copper pour connected to VEE (negative supply rail). This connection provides the dominant heat path (RθJB = 13.1 °C/W) and is required to maintain junction temperature within specification under full-load conditions. Failure to connect the thermal pad risks thermal shutdown or accelerated parametric drift.

Does the INA1620RTWT support single-supply operation?

Yes - the INA1620RTWT operates from a single supply of 4 V to 36 V, in addition to dual supplies of ±2 V to ±18 V. Input common-mode range extends to (V–) + 1.5 V and (V+) – 1 V, allowing rail-to-rail input operation in properly biased single-supply configurations - a key capability for portable audio products using the INA1620RTWT.