Texas Instruments TLC251ACDR

Overview

TLC251ACDR from Texas Instruments is a LinCMOS™ programmable low-power operational amplifier in an 8-pin SOIC package, featuring true single-supply operation down to 1.4 V, input common-mode range extending to the negative rail, and selectable bias modes (low/medium/high) with supply current ranging from 10 µA to 1600 µA at 5 V. It delivers unity-gain bandwidth up to 1.7 MHz and slew rate up to 3.6 V/µs in high-bias mode, making it suitable for battery-powered sensor front-ends and portable instrumentation.

For engineers reviewing the TLC251ACDR datasheet, TLC251ACDR pinout, TLC251ACDR application, or TLC251ACDR equivalent, this device offers verified programmable power-performance trade-offs across three bias-select configurations, confirmed ESD protection (>2000 V), and offset-null capability - critical for precision analog signal conditioning in energy-constrained systems.

Technical Context

The TLC251ACDR implements a silicon-gate LinCMOS™ process that eliminates input offset voltage drift without sacrificing CMOS advantages like ultra-low input bias current (≤60 pA typ) and high input impedance. Its BIAS SELECT pin enables dynamic configuration of internal current sources, directly controlling ac performance parameters including slew rate, unity-gain bandwidth, and noise density.

It supports stable unity-gain operation across all bias modes and supply voltages from 1.4 V to 16 V. The output stage uses a source-follower pull-up and open-drain pull-down architecture, delivering rail-to-rail compatible output swing (VOH ≥ 3.2 V, VOL ≤ 50 mV at RL = 10 kΩ) while maintaining specified phase margin (≥34°) and large-signal differential gain (≥50 V/mV in low-bias mode).

Key Specifications

Pinout & Package

Package: SOIC-8 (D package), tape-and-reel (suffix R), RoHS-compliant, MSL Level-1, 0°C to 70°C operating range.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable low-power op-amp applications.

Compared with TLC251ACDR, TLC27L2CDR sacrifices programmability and nulling for lower base current, while LPV821DRX replaces bias selection with zero-drift correction - making TLC251ACDR uniquely suited for adaptive, wide-supply, trimmable analog front-ends in constrained-energy systems.

Availability

TLC251ACDR is available at Aetrix Electronics and suitable for portable medical devices, solar-powered IoT sensors, and battery-operated data loggers requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for TLC251ACDR 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 op-amps and low-power design.

The TLC251 family was engineered for energy-constrained, single-supply applications demanding programmable performance - particularly in portable instrumentation, remote sensing, and battery-powered industrial controls.

FAQ

What is the minimum supply voltage for reliable operation of the TLC251ACDR?

The TLC251ACDR operates reliably down to 1.4 V, as confirmed in the datasheet's "Recommended Operating Conditions" table. At this voltage, it maintains functionality in low-bias mode with ~2 µA supply current and usable output swing (450–700 mV peak). Performance metrics such as bandwidth and slew rate scale downward, but the device remains functional and stable - enabling direct interface with partially discharged primary cells or low-voltage energy harvesters.

How does the BIAS SELECT pin affect the performance of the TLC251ACDR?

The BIAS SELECT pin on the TLC251ACDR determines one of three internal bias currents: grounding selects high-bias mode (~1600 µA), applying VDD/2 selects medium-bias (~280 µA), and tying to VDD selects low-bias (~17 µA). This directly scales ac performance - e.g., unity-gain bandwidth drops from 1.7 MHz (high) to 525 kHz (medium) to 65 kHz (low) at 5 V - while preserving dc specs like input offset and common-mode range across all modes.

Can the TLC251ACDR be used in dual-supply configurations?

Yes, the TLC251ACDR supports split-supply operation as long as input common-mode voltage, output swing, and absolute maximum ratings are respected. The datasheet confirms compatibility with dual supplies provided VICR stays within –0.2 V to (VDD – 0.2 V) and total supply differential does not exceed 18 V. However, its design emphasis is single-supply use - the input range includes GND, and the output stage is optimized for unipolar rails.

Does the TLC251ACDR require external compensation for unity-gain stability?

No, the TLC251ACDR is internally compensated for unity-gain stability across all bias modes and supply voltages from 1.4 V to 16 V. Datasheet phase margin measurements confirm ≥34° at unity gain (B1) under worst-case conditions (low-bias, 70°C), eliminating the need for external compensation components in standard configurations - simplifying layout and reducing bill-of-materials cost.

What is the purpose of the OFFSET N1 and OFFSET N2 pins on the TLC251ACDR?

The OFFSET N1 and OFFSET N2 pins on the TLC251ACDR provide access to the internal input offset voltage nulling network. Connecting a 25-kΩ potentiometer between these pins-with its wiper tied to VDD–/GND-allows manual adjustment to reduce input offset voltage to near zero. This capability is especially valuable in dc-critical applications like precision weigh scales or calibrated sensor interfaces where initial VIO (≤5 mV) must be further minimized.