Texas Instruments OPA1602AIDGKR

Overview

OPA1602AIDGKR from Texas Instruments is a dual-channel, bipolar-input audio operational amplifier optimized for high-fidelity signal conditioning in professional and consumer audio systems. It delivers 2.5nV/√Hz input voltage noise density, 0.00003% THD+N at 1kHz, 35MHz gain-bandwidth, rail-to-rail output swing within 600mV of rails (with 2kΩ load), and operates from ±2.25V to ±18V supplies. It is used as a pre-output driver in analog mixer line stages and A/V receiver headphone amplifiers.

For engineers reviewing the OPA1602AIDGKR datasheet, OPA1602AIDGKR pinout, OPA1602AIDGKR application, or OPA1602AIDGKR equivalent, key selection criteria include ultralow distortion in low-impedance source configurations (<1kΩ), thermal stability under sustained 30mA output drive, and compatibility with asymmetric supply rails (e.g., +25V/–5V) in broadcast equipment power architectures.

Technical Context

The OPA1602AIDGKR employs a fully differential, bipolar-input front-end with independent channel circuitry to achieve –130dB channel separation at 1kHz and eliminate crosstalk during overdrive. Its unity-gain stable architecture supports noninverting and inverting configurations without external compensation, maintaining phase margin >45° up to 35MHz with 2kΩ loads.

Input protection uses back-to-back diodes limiting differential input voltage; operation requires current limiting to ≤10mA when fast-ramping signals exceed slew-rate response. Output stage delivers ±30mA short-circuit current and drives capacitive loads up to 50pF with <10% overshoot when isolated by a 50Ω series resistor.

Key Specifications

Pinout & Package

OPA1602AIDGKR is packaged in an 8-pin MSOP (DGK) with exposed thermal pad, measuring 3.0mm × 3.0mm × 1.0mm. The package supports high-density audio PCB layouts and provides enhanced thermal dissipation (θJA = 154.7°C/W) compared to SO-8 variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA1612AIDR, OPA1602AIDGKR trades 1.4nV/√Hz higher noise for 0.9mA lower quiescent current and MSOP packaging-critical for space-constrained headphone amp modules. Against NE5532APDR, it delivers 2.5× lower THD+N and rail-to-rail swing, enabling direct drive of modern low-voltage codecs without level-shifting.

Availability

OPA1602AIDGKR is available at Aetrix Electronics and suitable for professional audio equipment, broadcast studio consoles, analog/digital mixers, and high-end A/V receivers requiring stable component supply with guaranteed long-term sourcing.

Supply support for OPA1602AIDGKR 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 high-performance audio signal chain components.

The OPA1602AIDGKR belongs to TI's SoundPlus™ precision audio op-amp family, engineered specifically for reference-grade audio applications demanding ultralow noise, distortion, and crosstalk in recording, mixing, and playback systems.

FAQ

What is the maximum capacitive load the OPA1602AIDGKR can drive without oscillation?

The OPA1602AIDGKR can drive up to 50pF capacitive load with <10% overshoot when a 50Ω series resistor isolates the output. Without isolation, stability degrades beyond 10pF due to reduced phase margin. This behavior is verified in Figure 19 of the SBOS474B datasheet, where small-signal overshoot vs capacitive load is characterized across multiple source resistances. For OPA1602AIDGKR designs, always include the 50Ω resistor in series with the output trace to ensure robustness in PCB layouts with long traces or connector stubs.

Does the OPA1602AIDGKR support single-supply operation?

Yes, the OPA1602AIDGKR supports single-supply operation from +4.5V to +36V total supply range, with input common-mode voltage extending to (V–)+2V and (V+)–2V. When operated from +15V with ground as V–, the input range is +2V to +13V, requiring level-shifting for AC-coupled audio signals centered at 0V. The device's rail-to-rail output swing remains functional, delivering up to +14.4V and down to +0.6V into 2kΩ. This capability is confirmed in the Electrical Characteristics table under "Voltage Output" and "Common-Mode Voltage Range" sections of the OPA1602AIDGKR datasheet.

How does the OPA1602AIDGKR's input protection affect fast transient signals?

The OPA1602AIDGKR uses back-to-back diodes across its inputs for ESD protection, which forward-bias during fast-ramping input signals exceeding the amplifier's slew rate. This causes momentary current conduction that must be limited to ≤10mA using series input resistors (RI) or feedback resistors (RF). As shown in Figure 32 and Application Information section, uncontrolled current leads to distortion and potential damage. For OPA1602AIDGKR, design RI ≥ 500Ω when input dV/dt exceeds 20V/μs to keep current within safe limits while minimizing added thermal noise.

What thermal considerations apply to the OPA1602AIDGKR in MSOP-8 (DGK) package?

The OPA1602AIDGKR in MSOP-8 (DGK) package has θJA = 154.7°C/W, meaning junction temperature rises 154.7°C above ambient per watt dissipated. At 2.6mA/channel and ±15V supply, quiescent power is 78mW; with 30mA output into 600Ω, worst-case power reaches 450mW. To limit Tj <125°C at 85°C ambient, PCB copper area under the exposed pad must provide ≥25°C/W effective θJB. TI recommends soldering the thermal pad to ≥1cm² internal ground plane with ≥4 thermal vias-verified in Thermal Information Table for DGK package.

Can the OPA1602AIDGKR replace the OPA2134 in existing designs?

The OPA1602AIDGKR is not a direct drop-in replacement for OPA2134 due to differences in pinout (OPA2134 SO-8 places V+ at Pin 8, OPA1602AIDGKR at Pin 5), noise profile (2.5nV/√Hz vs 8nV/√Hz), and supply current (2.6mA vs 4mA). While both are dual bipolar op-amps, OPA1602AIDGKR requires PCB layout revision to accommodate MSOP-8 footprint and repositioned power pins. Its superior THD+N (0.00003% vs 0.00008%) and rail-to-rail output justify redesign only when upgrading SNR or driving low-impedance loads in new audio product generations.