Texas Instruments TLC251CPW

Overview

TLC251CPW from Texas Instruments is a LinCMOS™ programmable low-power operational amplifier in an 8-pin TSSOP package, featuring true single-supply operation from 1.4 V to 16 V, input common-mode range extending to the negative rail, and selectable bias modes (10 µA / 150 µA / 1000 µA typical supply current). It delivers 1700 kHz unity-gain bandwidth in high-bias mode and supports precision sensor signal conditioning in battery-powered instrumentation.

For engineers reviewing the TLC251CPW datasheet, TLC251CPW pinout, TLC251CPW application, or TLC251CPW equivalent, this page provides verified pin functions, three confirmed bias-mode performance trade-offs, offset nulling implementation details, ESD protection rating (2000 V per MIL-STD-833C), and real-world design constraints for low-voltage (<2 V) operation.

Technical Context

The TLC251CPW uses silicon-gate LinCMOS™ process technology to achieve stable input offset voltage without metal-gate CMOS drift, enabling external nulling via two dedicated offset terminals. Its BIAS SELECT pin controls internal current sources to set one of three ac performance tiers-low, medium, or high bias-directly altering slew rate (0.03–3.6 V/µs), unity-gain bandwidth (65–1700 kHz), and input noise (68–25 nV/√Hz).

Input stage design supports rail-to-rail common-mode operation down to VDD–/GND, while output stage employs a source-follower pull-up and open-drain pull-down, yielding VOH dependent on load and VDD but VOL ≈ GND under no-load conditions. The device remains stable at unity gain across all bias modes and supply voltages ≥1.4 V.

Key Specifications

Pinout & Package

The TLC251CPW is housed in an 8-pin TSSOP (PW) package, 3.0 mm × 4.4 mm, 0.65 mm pitch, with exposed thermal pad (not electrically connected). Pin 4 is internally tied to the die backside and must be connected to VDD–/GND for proper thermal and electrical reference.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC27L2CP and LPV521MG, the TLC251CPW uniquely combines external offset trimming, three-tier bias programming, and 1.4 V operation - making it the only option among the three that supports both precision calibration and runtime power-performance adaptation in resource-constrained embedded systems.

Availability

TLC251CPW is available at Aetrix Electronics and suitable for portable medical devices, environmental sensor nodes, and industrial battery-backed instrumentation requiring stable component supply across extended product lifecycles.

Supply support for TLC251CPW 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 heritage in precision op-amp design and manufacturing.

The TLC251 family was engineered for ultra-low-voltage, low-power analog signal conditioning in battery-operated and energy-sensitive systems - emphasizing programmability, rail-to-rail input operation, and robustness in unregulated supply environments.

FAQ

What supply voltage range does the TLC251CPW support, and is operation below 2 V reliable?

The TLC251CPW operates from 1.4 V to 16 V, with full functionality-including specified input offset, common-mode range, and output swing-validated down to 1.4 V. At VDD = 1.4 V, high-bias mode delivers ~12 µA supply current and 0.1 V/µs slew rate, enabling basic buffering and slow-settling sensor interfaces. Data sheet Figures 4 and 11 confirm stable operation and measurable AVD at this voltage.

How does the BIAS SELECT pin function, and what logic levels configure each mode?

The BIAS SELECT pin (Pin 5) configures three distinct operating modes: tie to GND for high bias (~1000 µA), to VDD/2 for medium bias (~150 µA), or to VDD for low bias (~10 µA). These thresholds are defined in the Application Information section and validated across temperature. The TLC251CPW datasheet specifies that VI(SEL) = 0 V, VDD/2, or VDD yields consistent IDD and ac performance within published tolerances.

Can the TLC251CPW be used with dual supplies, and what are the limits?

Yes - although characterized for single-supply use, the TLC251CPW supports split supplies as long as total VDD ≤ 16 V, differential input voltage stays within ±18 V, and input common-mode voltage remains within –0.3 V to (VDD – 0.2 V). For example, ±5 V supplies (10 V total) are valid; however, inputs must stay between –0.3 V and +4.8 V relative to the negative rail.

What is the purpose of Pins 1 and 8 (OFFSET N1 and OFFSET N2), and how is nulling implemented?

Pins 1 and 8 provide dedicated terminals for external offset nulling. A 25-kΩ potentiometer is connected across them, with its wiper tied to Pin 4 (VDD–/GND). Adjusting the potentiometer injects corrective current into the input stage. Full nulling to zero is achievable in high-bias mode; in medium/low bias, residual offset may remain due to reduced internal current drive for trimming.

Does the TLC251CPW require external compensation for unity-gain stability, and what load capacitance is safe?

No external compensation is required - the TLC251CPW is internally compensated for unity-gain stability across all bias modes and supply voltages ≥1.4 V. Safe capacitive loading is up to 20 pF with 10 kΩ series resistance (per Figure 1 test condition); higher loads (e.g., >100 pF) may require isolation resistor or careful PCB layout to avoid peaking or oscillation.