Texas Instruments TLV522DGKR

Overview

TLV522DGKR from Texas Instruments is a dual nanopower rail-to-rail input/output (RRIO) CMOS operational amplifier optimized for ultra-low-power sensing front-ends. It delivers 8 kHz gain-bandwidth at 500 nA per channel, 4 mV max offset voltage, and operates from 1.7 V to 5.5 V across –40°C to 125°C - enabling precision signal conditioning in oxygen sensor analog stages, battery-powered gas detectors, and energy-harvested remote nodes.

For engineers reviewing the TLV522DGKR datasheet, TLV522DGKR pinout, TLV522DGKR application, or TLV522DGKR equivalent, key selection criteria include its sub-1 µA quiescent current, pA-level input bias current for high-Z transducer interfaces, rail-to-rail operation at low supply voltages, EMI-hardened design for noisy industrial environments, and VSSOP-8 packaging suitable for space-constrained PCB layouts.

Technical Context

The TLV522DGKR integrates two independent CMOS op-amp channels with complementary differential input pairs enabling true rail-to-rail input operation - N-channel and P-channel stages switch dynamically across the common-mode range, with a defined 400 mV transition region where PSRR and CMRR degrade. Its unity-gain stable architecture supports direct use in buffer, transimpedance, and filtering configurations without external compensation.

Each channel draws only 500 nA quiescent current while maintaining 91 dB open-loop gain, 62 dB minimum CMRR over 0–3.3 V common-mode range, and output swing within 3 mV of rails at 3.3 V - critical for maximizing dynamic range in single-supply 3 V systems. Input bias current remains ≤1 pA across temperature, preserving accuracy in megaohm-feedback photodiode or electrochemical sensor circuits.

Key Specifications

Pinout & Package

TLV522DGKR is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm with exposed thermal pad connected internally to V−. The pinout supports dual independent amplifier channels with non-inverting/inverting inputs and outputs routed to adjacent pins for compact layout and minimized trace coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPV821DRX, TLV522DGKR provides dual-channel capability and 78% higher bandwidth at 23% lower quiescent current - making it superior for multi-sensor, low-power analog acquisition. Neither part is pin-compatible with TLV522DGKR; redesign required for substitution.

Availability

TLV522DGKR is available at Aetrix Electronics and suitable for oxygen sensor modules, battery-powered gas detection systems, and energy-harvested remote sensing nodes requiring stable component supply across extended production lifecycles.

Supply support for TLV522DGKR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TLV522DGKR belongs to TI's nanopower op-amp product line, engineered specifically for ultra-low-power signal conditioning in battery- and energy-harvested sensor systems - emphasizing pA input bias, rail-to-rail operation, and EMI resilience.

FAQ

What is the maximum operating temperature for TLV522DGKR?

The TLV522DGKR is fully specified and tested from –40°C to +125°C ambient temperature. Its electrical characteristics - including input offset voltage drift (1.5 µV/°C), quiescent current, and gain-bandwidth - remain guaranteed across this full industrial temperature range, making it suitable for under-hood automotive sensors and industrial combustion analyzers.

Does TLV522DGKR support single-supply operation?

Yes, TLV522DGKR supports true single-supply operation from 1.7 V to 5.5 V. Its rail-to-rail input extends to V− and V+, and its output swings to within 3 mV of both rails at 3.3 V - enabling direct interface with 0–3.3 V oxygen sensor outputs and elimination of negative supply generation in portable designs.

Can TLV522DGKR drive capacitive loads directly?

No - TLV522DGKR requires isolation resistance (RISO) when driving capacitive loads >50 pF, such as ADC input capacitance or long PCB traces. As shown in TI's application note, adding a 100 Ω–1 kΩ resistor between the TLV522DGKR output and the capacitive load restores phase margin and prevents peaking or oscillation in unity-gain configurations.

Is TLV522DGKR pin-compatible with other TI dual op-amps in VSSOP-8?

No - TLV522DGKR has a unique pinout optimized for dual independent amplifiers (OUT A/−IN A/+IN A/V−/+IN B/−IN B/OUT B/V+). It is not pin-compatible with TLV2462, TLC2272, or OPA2333 in the same DGK package; PCB layout must be designed specifically for TLV522DGKR's signal routing and thermal pad connection.

What is the typical input-referred voltage noise of TLV522DGKR at 1 kHz?

The TLV522DGKR exhibits 300 nV/√Hz input-referred voltage noise at 1 kHz, as measured under standard conditions (TA = 25°C, V+ = 3.3 V, RL > 1 MΩ). This noise performance - combined with its 1 pA input bias current - makes it well-suited for low-frequency, high-impedance sensor interfaces where Johnson-Nyquist and current noise dominate total error.