Texas Instruments TLC084CDR

Summary of the TLC084CDR Four-Channel Operational Amplifier

Texas Instruments’ TLC084CDR is a member of the TLC08x general-purpose operational amplifier family, specifically designed to deliver wide bandwidth and high output drive in single-supply systems. The TLC084CDR offers four independent amplifier circuits in a single 14-pin SOIC surface-mount package, positioning it as a robust solution for applications in industrial, automotive, audio, and instrumentation markets. Leveraging BiMOS technology, the TLC084CDR combines the benefits of CMOS low-noise inputs with bipolar high-drive output stages, making it a versatile choice for engineers seeking both performance and integration.

Main Technical Features of the TLC084CDR

A closer look at the TLC084CDR reveals its suitability for demanding analog applications. The device features a generous supply voltage range from 4.5 V to 16 V (single supply) or ±2.25 V to ±8 V (split supply) and supports an operating temperature from 0°C to 70°C for commercial grades. Each channel typically draws 1.9 mA, and its input bias current is as low as 3 pA, ensuring minimal input disturbance for high-impedance sensors.

The quad architecture provides four amplifier circuits, each with a gain-bandwidth product of 10 MHz, delivering excellent AC response. The slew rate achieves up to 19 V/μs, ensuring rapid response to dynamic input signals, while input offset voltages are typically maintained at 3 mV or less. The TLC084CDR delivers up to ±50 mA output drive per channel, comfortably driving moderate loads—an essential feature for signal buffering, analog filtering, or sensor interfacing.

Benefits of BiMOS Design in the TLC084CDR

The TLC084CDR is a standout example of Texas Instruments’ LBC3 BiCMOS process. This architecture merges the ultra-high input impedance and low noise performance of CMOS front ends with the robust output drive of bipolar transistors. The result is a low-noise operation (input voltage noise density of 8.5 nV/√Hz at 1 kHz) and a notable gain in bandwidth, up to 10 MHz compared to previous BiFET amplifier generations.

For engineers, the BiMOS structure translates into an upgrade path: superior offset voltage (as low as 1.5 mV in higher-grade variants), improved common mode input range extending down to ground, and assured power supply rejection up to 130 dB. These advantages strongly benefit precision analog front ends and high-performance active filters.

Engineering Performance Attributes of the TLC084CDR

From real-world engineering scenarios, the TLC084CDR’s performance parameters play a central role. Output swing nears the rails, supporting high-level signals with low distortion (THD+N as low as 0.005% at moderate gain settings), while the device’s fast slew rate ensures accurate reproduction of rapidly changing analog signals—an imperative for data acquisition, waveform generation, and active filter stages.

With differential input resistance exceeding 1 GΩ and common-mode input limits supporting ground-referenced inputs, the TLC084CDR simplifies design for high-impedance sensor interfaces. Its supply current per channel (1.9 mA) and shutdown capability in other family members offer important clues for power-sensitive designs, even though the TLC084CDR itself does not feature integrated shutdown.

TLC084CDR Package Options and Heat Management

The TLC084CDR is provided in a 14-pin SOIC (Small Outline Integrated Circuit) format, which offers a balance between footprint reduction and thermal performance. The typical SOIC package dissipates up to 1022 mW at 25°C ambient (θJA = 122.3°C/W), making it suitable for applications needing moderate power dissipation without resorting to additional cooling mechanisms.

For design engineers, consideration must be given to thermal management in high-density layouts and when driving loads near maximum rating. For environments requiring extended temperature operation, alternative package suffixes are available in the TLC084 series, extending the operational range to industrial standards (–40°C to 125°C).

Possible Substitute or Alternative Models for the TLC084CDR

When evaluating the TLC084CDR, engineers may consider equivalent or replacement products within Texas Instruments’ TLC08x family or from industry alternatives. Direct replacements within the TLC08x family include the TLC084CN (PDIP package), TLC084CPWP (TSSOP package), and extended-temperature versions (TLC084ID, TLC084IN, TLC084IPWP). Performance is generally consistent across packages, but engineers should verify supply voltage, bandwidth, and temperature ratings against application requirements.

Other quad op amp solutions in the broader TI BiMOS family, such as the TLC085 (with shutdown functionality in select packages), may suit designs requiring power-down or ultra-low power modes. For legacy compatibility, the earlier TL084-series BiFET op amps may serve as basic substitutes, though they feature lower bandwidth and output drive.

Conclusion

: Selecting the right quad op amp for advanced analog design

The Texas Instruments TLC084CDR quad op amp stands out for its high bandwidth, robust output drive, versatile supply range, and advanced BiMOS architecture, providing engineers with a reliable upgrade path for modern single-supply analog applications. Its specification profile—encompassing low input noise, high slew rate, and wide common-mode input range—makes it particularly well-suited for complex analog signal processing tasks. Matching package, temperature rating, and electrical characteristics to application needs enables product selection engineers and procurement teams to optimize performance, reliability, and cost in their analog system designs.