Texas Instruments TLC251CP

Overview

TLC251CP from Texas Instruments is a LinCMOS™ programmable low-power operational amplifier in an 8-pin plastic DIP package, designed for single-supply operation from 1.4 V to 16 V with true rail-to-rail input common-mode range extending to the negative rail, 10 mV max input offset voltage (25°C), and selectable high/medium/low bias modes enabling trade-offs between supply current (10 µA to 1600 µA) and ac performance.

For engineers reviewing the TLC251CP datasheet, TLC251CP pinout, TLC251CP application, or TLC251CP equivalent, this device supports battery-powered instrumentation, low-voltage sensor interfaces, and energy-constrained portable systems where programmable power/performance scaling and external offset nulling are required.

Technical Context

The TLC251CP implements a silicon-gate LinCMOS™ process to achieve stable input offset voltage without metal-gate CMOS drift, while retaining ultra-low input bias current (≤60 pA typ at 25°C) and high input impedance. Its BIAS SELECT pin configures three distinct operating modes-high-bias (1600 µA, 3.6 V/µs slew rate), medium-bias (280 µA, 0.43 V/µs), and low-bias (17 µA, 0.03 V/µs)-each with corresponding load-dependent gain-bandwidth and phase margin characteristics.

It features internal ESD protection exceeding 2000 V per MIL-STD-833C Method 3015.1, operates across 0°C to 70°C, and supports external offset nulling via two dedicated pins (OFFSET N1/N2) with a 25-kΩ potentiometer. The output stage uses a source-follower pull-up and open-drain pull-down, delivering VOH up to 4.1 V and VOL down to 0 mV (no load) at VDD = 5 V.

Key Specifications

Pinout & Package

Package: 8-pin Plastic Dual In-line Package (PDIP), 0.3-inch body width, through-hole mounting.

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 TLC27M2CP, the TLC251CP provides unique runtime-selectable bias modes that allow dynamic adaptation to changing signal bandwidth and power budget requirements-enabling one hardware design to serve multiple operating states without redesign.

Availability

TLC251CP is available at Aetrix Electronics and suitable for portable medical sensors, energy-harvesting interfaces, remote environmental monitoring, and other applications requiring stable component supply with long-term industrial availability.

Supply support for TLC251CP 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 founded in 1930, specializing in analog and embedded processing technologies with broad manufacturing scale and long-product-lifecycle commitment.

The TLC251 series belongs to TI's LinCMOS™ precision op-amp product line, engineered specifically for battery-powered and energy-constrained systems requiring programmable power/performance scaling and rail-to-rail input operation.

FAQ

What is the minimum supply voltage for reliable operation of the TLC251CP?

The TLC251CP is characterized for stable operation down to 1.4 V, with verified functionality including input common-mode range, output swing, and bias-select control at this voltage. At VDD = 1.4 V, typical supply current is 12 µA in high-bias mode and 2 µA in low-bias mode, and unity-gain bandwidth remains at 12 kHz. Operation below 1.4 V is not specified and may result in degraded parameters or instability.

How does the BIAS SELECT pin configure the three operating modes of the TLC251CP?

The BIAS SELECT pin selects bias mode by voltage level: grounding the pin enables high-bias mode (≈1600 µA, 3.6 V/µs slew rate), applying VDD/2 enables medium-bias mode (≈280 µA, 0.43 V/µs), and connecting to VDD enables low-bias mode (≈10 µA, 0.03 V/µs). These thresholds are validated across 0°C to 70°C and support direct microcontroller GPIO control for dynamic power management in the TLC251CP.

Can the TLC251CP be used in dual-supply configurations?

Yes, the TLC251CP supports split-supply operation (e.g., ±5 V) provided the input common-mode voltage stays within –0.2 V to VDD–0.2 V, output swing remains within supply limits, and absolute maximum ratings (e.g., 18 V total supply differential) are observed. Its rail-to-rail input stage and output stage compatibility with dual rails make it usable in traditional op-amp topologies, though it is optimized for single-supply use.

What is the purpose and connection method for the OFFSET N1 and OFFSET N2 pins on the TLC251CP?

The OFFSET N1 and OFFSET N2 pins enable external trimming of input offset voltage using a 25-kΩ potentiometer: one end connects to OFFSET N1, the other to OFFSET N2, and the wiper ties to VDD–/GND. This configuration allows adjustment of VIO to near-zero in high-bias mode; nulling range decreases in medium/low-bias modes or at VDD < 4 V, where full trim may not be achievable for all units.

Does the TLC251CP include built-in ESD protection, and what level is specified?

Yes, the TLC251CP incorporates internal electrostatic discharge (ESD) protection circuits rated to exceed 2000 V per MIL-STD-833C, Method 3015.1. This protection prevents catastrophic failure during handling, though parametric degradation may occur with repeated ESD exposure. Proper ESD-safe practices-including grounded workstations and ionized air-are still required during PCB assembly and testing of the TLC251CP.