Texas Instruments TLC4502ACD

Overview

TLC4502ACD from Texas Instruments is a dual-channel, self-calibrating precision CMOS rail-to-rail output operational amplifier. It achieves 40 µV maximum input offset voltage after digital calibration, 4.7 MHz gain-bandwidth product, 2.5 V/µs slew rate, and ±50 mA output drive-enabling high-accuracy signal conditioning in single-supply data acquisition systems.

For engineers reviewing the TLC4502ACD datasheet, TLC4502ACD pinout, TLC4502ACD application, or TLC4502ACD equivalent, this device is selected for low-drift, capacitive-load-stable amplification in portable instrumentation, industrial sensor interfaces, and precision analog front-ends where chopper or laser-trimmed alternatives are cost- or noise-prohibitive.

Technical Context

The TLC4502ACD integrates on-chip successive approximation register (SAR) logic to digitally trim input offset voltage within 300 ms of power-on, then removes calibration circuitry from the signal path-operating thereafter as a standard precision op amp. Its CMOS input stage delivers 1 pA typical input bias current and 10¹² Ω input resistance.

It supports rail-to-rail output swing (within 100 mV of rails at ±50 mA), stable operation with 1000 pF capacitive loads, and operates from 4 V to 6 V supply across 0°C to 70°C ambient. Input common-mode range extends to VDD– and VDD+ – 2.3 V.

Key Specifications

Pinout & Package

Package: SOIC-8 (D package), 150 mil width, surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision op amp applications.

Compared with OPA2188AIDR and AD8629ARZ, the TLC4502ACD uniquely combines factory-calibrated offset with low power (3.5 mA/ch), rail-to-rail output, and proven 1000 pF load stability-making it optimal for cost-sensitive, space-constrained industrial DAQ where initial accuracy and capacitive drive matter most.

Availability

TLC4502ACD is available at Aetrix Electronics and suitable for portable digital scales, industrial sensor signal conditioning, and data acquisition systems requiring stable component supply with guaranteed long-term sourcing.

Supply support for TLC4502ACD 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TLC450x family was designed specifically for high-precision, single-supply measurement applications where traditional op amps fail due to input offset drift, limited output swing, or instability with capacitive loads.

FAQ

What is the calibration time of the TLC4502ACD and how does it affect system startup?

The TLC4502ACD completes its self-calibration sequence in 300 ms after power-on. During this period, the output is invalid and should be ignored by downstream circuitry. Once calibration finishes, the device functions as a standard op amp with no further latency or interruption. This fixed 300 ms window must be accounted for in system power-up sequencing and firmware initialization routines for the TLC4502ACD.

Does the TLC4502ACD require external components to achieve rail-to-rail output operation?

No, the TLC4502ACD achieves true rail-to-rail output swing (within 100 mV of VDD+ and VDD– at ±50 mA) without external components. However, proper PCB layout-short traces, local 0.1 µF ceramic decoupling at Pin 8 (VDD+) and Pin 4 (GND), and ground plane continuity-is essential to maintain specified output swing and stability. No pull-up/pull-down resistors or output clamps are needed for standard operation of the TLC4502ACD.

Can the TLC4502ACD drive a 1000 pF capacitive load without oscillation?

Yes-the TLC4502ACD is explicitly characterized and guaranteed stable when driving up to 1000 pF capacitive loads, per the datasheet's "Stable Driving 1000 pF Capacitive Loads" specification. This capability eliminates the need for series isolation resistors typically required with general-purpose op amps, simplifying design in ADC driver, cable-driving, and filter applications using the TLC4502ACD.

What is the maximum supply voltage for the TLC4502ACD and what happens if exceeded?

The absolute maximum supply voltage for the TLC4502ACD is 7 V. Operation above 6 V violates recommended conditions and risks permanent damage. At 7 V, internal ESD structures may conduct, causing increased quiescent current, output phase reversal, or latch-up. For reliable operation, the TLC4502ACD must be powered within 4 V to 6 V, with 5 V being the nominal and most commonly used supply.

How does the input common-mode voltage range of the TLC4502ACD compare to standard CMOS op amps?

The TLC4502ACD supports an input common-mode range from VDD– (GND) to VDD+ – 2.3 V-wider than many CMOS op amps that only extend to VDD+ – 1.5 V. This allows direct interfacing with sensors whose output reaches near VDD (e.g., ratiometric bridge sensors tied to same 5 V rail), without level-shifting. The full specification applies across 0°C to 70°C for the TLC4502ACD.