Texas Instruments TL780-05CKTTR

Overview

TL780-05CKTTR from Texas Instruments is a fixed-output +5 V, 1.5 A positive-voltage linear regulator in TO-263 (KTT) package with ±1% output tolerance at 25°C, thermal shutdown, and internal short-circuit current limiting - used in industrial power supplies, embedded control rails, and analog subsystems requiring stable low-noise DC voltage.

For engineers reviewing the TL780-05CKTTR datasheet, TL780-05CKTTR pinout, TL780-05CKTTR application, or TL780-05CKTTR equivalent, key selection criteria include dropout voltage (2 V @ 1 A), ripple rejection (70–85 dB), output noise (75 µV), thermal resistance (θ_JA = 25.3°C/W), and compatibility with standard µA7800-series PCB layouts.

Technical Context

The TL780-05CKTTR implements a three-terminal series-pass architecture with an internally trimmed band-gap reference and temperature-compensation circuitry to achieve ±1% initial accuracy and ±2% tolerance across 0°C to 125°C. Its design eliminates external compensation components and supports operation with only 0.33 µF input and 0.22 µF output capacitors.

It features built-in protection including thermal shutdown triggered at ~150°C virtual junction temperature and foldback current limiting that reduces short-circuit output current to 750 mA at 25°C. The device maintains <0.0035 Ω output resistance and 0.25 mV/°C temperature coefficient over full operating range.

Key Specifications

Pinout & Package

TL780-05CKTTR uses the TO-263 (KTT) surface-mount package with exposed thermal pad, 3-pin configuration, and standard pinout identical to µA7800 series: Pin 1 = INPUT, Pin 2 = OUTPUT, Pin 3 = COMMON (GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar positive-voltage regulator applications.

Compared with LM7805CDT/NOPB, TL780-05CKTTR delivers superior accuracy and defined thermal protection; compared with TLV76050DBVR, it provides 3× higher output current and robustness for industrial thermal environments - making TL780-05CKTTR the preferred choice for 5 V/1.5 A fixed-rail applications demanding reliability and legacy compatibility.

Availability

TL780-05CKTTR is available at Aetrix Electronics and suitable for industrial automation, embedded control, and analog signal conditioning requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant packaging.

Supply support for TL780-05CKTTR 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 power management technologies, with decades of expertise in high-reliability linear regulators and industrial-grade ICs.

The TL780 series was designed as an improved, precision replacement for the µA7800 family - targeting industrial power rails, PLC modules, and legacy equipment upgrades where accuracy, thermal robustness, and pin compatibility are critical.

FAQ

What is the maximum input voltage rating for TL780-05CKTTR?

The absolute maximum input voltage for TL780-05CKTTR is 35 V, but the recommended operating range is 7 V to 25 V for optimal regulation and thermal performance. Exceeding 25 V increases power dissipation and risks triggering thermal shutdown, especially at high load currents. Always verify input-to-output differential against the 2 V dropout specification when designing with TL780-05CKTTR.

Does TL780-05CKTTR require external capacitors, and what values are recommended?

Yes, TL780-05CKTTR requires a minimum 0.33 µF ceramic or tantalum capacitor on the input and a minimum 0.22 µF capacitor on the output for stability and transient response. These values are specified in the official TI datasheet and validated across temperature and load conditions. Using smaller or missing either capacitor may cause oscillation or degraded ripple rejection in TL780-05CKTTR applications.

Is TL780-05CKTTR pin-compatible with older 7805 regulators like LM7805?

Yes, TL780-05CKTTR has identical pinout (INPUT–OUTPUT–COMMON) and footprint compatibility with µA7800-series devices, including LM7805 variants in TO-263 (KTT) packages. This allows direct replacement in existing designs without PCB modification. However, note that TL780-05CKTTR offers tighter output tolerance (±1% vs. ±2%) and defined thermal shutdown behavior not guaranteed in legacy parts.

What is the thermal resistance (θ_JA) of TL780-05CKTTR, and how does it affect power dissipation?

The published θ_JA for TL780-05CKTTR in TO-263 (KTT) package is 25.3°C/W under JEDEC High-K board conditions. At 25°C ambient, this limits usable power dissipation to approximately 0.6 W before reaching the 125°C junction limit - meaning practical continuous operation at 1.5 A requires ≤0.4 V input-output differential or active heatsinking. Thermal design must account for this in TL780-05CKTTR implementations.

Can TL780-05CKTTR be used in negative-voltage configurations?

No, TL780-05CKTTR is strictly a positive-voltage regulator and must not be operated with OUTPUT pulled below COMMON (ground). Doing so risks permanent damage due to reverse-bias breakdown of internal junctions. For negative regulation, TI recommends dedicated negative regulators like TL790 series - TL780-05CKTTR is unsuitable for inverted or dual-supply configurations without external protection circuitry.