Texas Instruments OPA1602AIDGK

Overview

OPA1602AIDGK from Texas Instruments is a dual-channel, bipolar-input audio operational amplifier optimized for high-fidelity signal conditioning in professional analog audio paths. It delivers 2.5nV/√Hz input voltage noise density, 0.00003% THD+N at 1kHz, and rail-to-rail output swing within 600mV of supply rails into 2kΩ - enabling ultra-low-noise preamplification in studio-grade microphone preamps and line-level driver stages.

For engineers reviewing the OPA1602AIDGK datasheet, OPA1602AIDGK pinout, OPA1602AIDGK application, or OPA1602AIDGK equivalent, key selection criteria include its 35MHz gain-bandwidth product, ±2.25V to ±18V dual-supply operation, 20V/μs slew rate, and MSOP-8 package suitability for space-constrained PCB layouts in high-density audio routing systems.

Technical Context

The OPA1602AIDGK employs a fully differential, bipolar-input front-end with independent channel circuitry to achieve –130dB channel separation at 1kHz and eliminate crosstalk in stereo/multichannel audio chains. Its unity-gain stable architecture supports noninverting and inverting configurations without external compensation, while internal ESD protection diodes (4kV HBM) safeguard against transient overvoltage on IN+/IN– pins.

It operates across –40°C to +85°C with guaranteed performance in open-loop gain (≥114dB), CMRR (≥114dB), and PSRR (≤2μV/V), maintaining low distortion under dynamic load conditions - including capacitive loads up to 50pF when isolated with a 50Ω series output resistor.

Key Specifications

Pinout & Package

OPA1602AIDGK is housed in an 8-pin MSOP (DGK) package with exposed thermal pad, optimized for thermal dissipation in compact audio PCBs. Pin pitch is 0.5mm; body dimensions are 3.0mm × 3.0mm × 1.0mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA1602AIDGK, OPA1612AIDR offers superior noise performance at higher power cost and larger footprint, while LM4562MA/NOPB provides identical THD+N in legacy packaging but with reduced supply headroom and thermal management capability.

Availability

OPA1602AIDGK is available at Aetrix Electronics and suitable for professional audio equipment, broadcast studio infrastructure, and high-end A/V receivers requiring stable component supply with traceable sourcing and long-term lifecycle support.

Supply support for OPA1602AIDGK 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 expertise in precision signal chain solutions.

The OPA1602AIDGK belongs to TI's SoundPlus™ audio op-amp family, engineered specifically for high-fidelity audio signal conditioning where ultralow noise, vanishing distortion, and exceptional channel isolation are mandatory.

FAQ

What is the maximum capacitive load the OPA1602AIDGK can drive without instability?

The OPA1602AIDGK remains stable driving up to 50pF directly, but for loads exceeding this value, a 50Ω series resistor must be added between the output pin and the capacitive load. This isolation technique maintains phase margin and prevents peaking or oscillation, as verified in Figure 19 of the SBOS474B datasheet. The OPA1602AIDGK's internal compensation is optimized for 2kΩ resistive loads, not heavy capacitance.

Does the OPA1602AIDGK support single-supply operation?

Yes, the OPA1602AIDGK supports single-supply operation from +4.5V to +36V total supply range (e.g., +30V and GND). However, its input common-mode range extends only from (V–)+2V to (V+)-2V, so level-shifting or AC-coupling is required when operating with ground-referenced inputs. The device's rail-to-rail output swing remains functional, delivering up to (V+)–0.6V and down to (V–)+0.6V.

How does the OPA1602AIDGK's input protection affect fast transient signals?

The OPA1602AIDGK uses back-to-back diodes between IN+ and IN– for ESD protection. During fast-ramping input signals (e.g., square waves >10V/μs), these diodes may forward-bias if the output cannot respond quickly enough - causing momentary current flow. To prevent damage, input current must be limited to ≤10mA using series resistors (RI) or feedback resistors (RF), as detailed in the INPUT PROTECTION section of SBOS474B.

What thermal considerations apply to the OPA1602AIDGK in MSOP-8 (DGK) package?

The OPA1602AIDGK in DGK package has a junction-to-ambient thermal resistance (θJA) of 154.7°C/W. For reliable operation at full ±18V supply and 30mA output current, the PCB must include a thermal pad soldered to a ≥1cm² copper pour. Without adequate copper area, junction temperature can exceed 125°C even at room ambient - degrading THD+N and accelerating parametric drift. Thermal vias under the pad are strongly recommended.

Can the OPA1602AIDGK replace the OPA2134 in existing designs?

The OPA1602AIDGK is not a direct drop-in replacement for the OPA2134 due to differences in pinout (OPA2134 uses SO-8 with different pin assignments) and electrical behavior: OPA1602AIDGK offers lower noise (2.5nV/√Hz vs 8nV/√Hz), higher slew rate (20V/μs vs 20V/μs same), and improved THD+N (0.00003% vs 0.00008%). Layout revision is required for pin compatibility, and stability analysis must be repeated due to differing compensation characteristics.