Texas Instruments TLC27L1BCD

Overview

TLC27L1BCD from Texas Instruments is a low-power, single-channel LinCMOS operational amplifier optimized for single-supply operation in battery-powered and remote sensor systems. It features 10 mV max input offset voltage (25°C), 68 nV/√Hz input voltage noise at 1 kHz, 17 µA typical supply current, rail-to-rail output swing to negative rail, and operates from 3 V to 16 V over 0°C to 70°C. It serves as a precision signal conditioner in field transmitter front-ends.

For engineers reviewing the TLC27L1BCD datasheet, TLC27L1BCD pinout, TLC27L1BCD application, or TLC27L1BCD equivalent, key selection criteria include its ultra-low quiescent current, input common-mode range extending below ground, high 10¹² Ω input impedance, ESD protection up to 2000 V, and compatibility with legacy offset-adjust circuits on older silicon revisions.

Technical Context

The TLC27L1BCD uses Texas Instruments' silicon-gate LinCMOS process, delivering superior offset-voltage stability versus metal-gate alternatives and enabling latch-up immunity. Its input stage supports single-supply operation with common-mode voltage down to –0.2 V (at VDD = 5 V) and output swing to the negative rail - critical for low-voltage sensor interfacing.

It exhibits 85 kHz unity-gain bandwidth and 0.03 V/µs slew rate at VDD = 5 V, with phase margin of 34° under standard test conditions (CL = 20 pF). Input bias current is typically 0.6 pA at 25°C, and CMRR reaches 87 dB, supporting accurate amplification in noisy industrial environments.

Key Specifications

Pinout & Package

Package: SOIC-8 (D package), 3.9 mm × 4.9 mm body, 1.27 mm pitch, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2461CD and LPV521MG/NOPB, the TLC27L1BCD uniquely balances sub-20 µA supply current, 3–16 V operation, and legacy-compatible offset adjustment - making it the only viable option for upgrading existing 8-pin SOIC field transmitter designs requiring long-life battery operation and industrial supply flexibility.

Availability

TLC27L1BCD is available at Aetrix Electronics and suitable for smoke detector manufacturing, industrial pressure transmitter production, and motion-sensing module development requiring stable component supply and long-term lifecycle support.

Supply support for TLC27L1BCD 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, embedded processing, and connectivity technologies, with decades of heritage in precision analog design.

The TLC27L1x family was developed to deliver LinCMOS performance - high input impedance, low drift, and latch-up immunity - for industrial sensor signal conditioning, replacing bipolar op-amps in battery-powered and harsh-environment applications.

FAQ

What is the maximum operating temperature range for the TLC27L1BCD?

The TLC27L1BCD is characterized for operation from 0°C to +70°C. This C-suffix grade is intended for commercial and industrial indoor applications, not extended-temperature environments. For –40°C to +85°C operation, the TLC27L1ID or TLC27L1IDR variants are specified. The TLC27L1BCD's electrical parameters - including supply current, offset voltage, and CMRR - are guaranteed only within the 0°C to 70°C range.

Does the TLC27L1BCD support true rail-to-rail input operation?

The TLC27L1BCD does not support rail-to-rail input; its common-mode input voltage range extends to –0.2 V (below GND) and up to +3.5 V when VDD = 5 V. While this allows inputs below ground - useful for shunt current sensing - it does not accommodate signals near VDD. The output, however, swings to within 50 mV of GND and up to 4.1 V (at VDD = 5 V), providing rail-to-rail capability on the output side only.

Can the OFFSET N1 and OFFSET N2 pins on the TLC27L1BCD be used for trimming?

On newer silicon revisions of the TLC27L1BCD, OFFSET N1 (Pin 1) and OFFSET N2 (Pin 5) are NC (not internally connected) and must be left unconnected. Only legacy silicon versions support offset adjustment via these pins. TI documentation confirms that modern production units do not implement internal bias-select circuitry on these pins, so external trimming networks will have no effect on the TLC27L1BCD's offset voltage.

What is the typical input bias current of the TLC27L1BCD at room temperature?

The typical input bias current of the TLC27L1BCD is 0.6 pA at 25°C, with a maximum of 60 pA over the full 0°C to 70°C operating range. This ultra-low value stems from its LinCMOS input stage and enables use with high-impedance sources such as photodiodes, piezoelectric sensors, and passive RC filters without significant signal attenuation or time-constant degradation.

Is the TLC27L1BCD suitable for driving capacitive loads?

The TLC27L1BCD is not optimized for heavy capacitive loads. Its phase margin drops to 30° at 70°C with CL = 20 pF, and stability is not guaranteed beyond 50 pF. For driving ADC input capacitors or long cables, external isolation (e.g., series resistor + local bypass) or a dedicated buffer stage is recommended. The device's unity-gain bandwidth (85 kHz) and 0.03 V/µs slew rate further indicate it is intended for low-frequency, low-capacitance applications.