Texas Instruments UA7805CKTTRG3

Overview

UA7805CKTTRG3 from Texas Instruments is a fixed +5 V, 1.5 A linear voltage regulator in TO-263 (KTT) package with thermal overload protection, short-circuit current limiting, and output capacitor–free stability. It delivers regulated power for microcontroller logic rails, sensor signal conditioning circuits, and industrial I/O modules requiring low-noise DC supply.

For engineers reviewing the UA7805CKTTRG3 datasheet, UA7805CKTTRG3 pinout, UA7805CKTTRG3 application, or UA7805CKTTRG3 equivalent, key selection criteria include dropout voltage (2 V at 1 A), ripple rejection (62–68 dB at 120 Hz), thermal resistance (R_θJC = 17 °C/W), and compatibility with standard 0.33 µF input / 0.1 µF output decoupling.

Technical Context

The UA7805CKTTRG3 implements a monolithic NPN series-pass transistor architecture with internal safe-area compensation and bias-current–stabilized reference. Its thermal shutdown activates at ~150 °C virtual junction temperature, and short-circuit limiting holds peak output current to 750 mA at 25 °C.

It operates across 0–125 °C ambient, requires no external compensation, and maintains ±2.5% output voltage accuracy over full load (5 mA–1.5 A) and line (7–25 V input) ranges. Input-to-output differential must exceed 2 V for regulation; typical bias current is 4.2–8 mA.

Key Specifications

Pinout & Package

UA7805CKTTRG3 uses the TO-263 (KTT) surface-mount package: 10.06 mm × 9.02 mm body, exposed thermal pad, 3-pin configuration with gull-wing leads. The exposed pad must be soldered to PCB copper for thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output linear regulator applications.

Compared with LM7805CDT/NOPB and MC7805BDTRKG, UA7805CKTTRG3 offers identical TO-263 thermal performance and industry-standard 3 kV HBM ESD rating, but at lower unit cost and with TI's long-term product continuity commitment for industrial use.

Availability

UA7805CKTTRG3 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, embedded microcontroller power rails, and test & measurement equipment requiring stable component supply and long lifecycle support.

Supply support for UA7805CKTTRG3 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 over 45 years of linear regulator innovation.

The UA78xx family was designed for robust, low-cost on-card regulation in industrial, computing, and telecommunications systems where reliability and thermal resilience are critical.

FAQ

What is the maximum input voltage for UA7805CKTTRG3?

The absolute maximum input voltage for UA7805CKTTRG3 is 35 V, but the recommended operating range is 7 V to 25 V. Exceeding 25 V increases power dissipation and thermal stress without functional benefit, and operation above 35 V risks permanent damage per the Absolute Maximum Ratings table in the SLVS056P datasheet.

Does UA7805CKTTRG3 require an input capacitor?

Yes, UA7805CKTTRG3 requires a minimum 0.33 µF input capacitor placed close to the INPUT and COMMON pins. This capacitor filters high-frequency noise and prevents oscillation during transient load changes. Ceramic or tantalum types are recommended; aluminum electrolytics may be used if ESR is ≤1 Ω.

Can UA7805CKTTRG3 be used in adjustable-output configurations?

Yes, UA7805CKTTRG3 can be configured for adjustable output using external resistors and a feedback network, as documented in Figure 7 of the SLVS056P datasheet. However, its internal 5 V reference is optimized for fixed operation; adjustable use sacrifices initial accuracy, line/load regulation, and thermal performance versus dedicated adjustable regulators like LM317.

What is the thermal pad connection requirement for UA7805CKTTRG3?

The exposed thermal pad on UA7805CKTTRG3 (KTT package) must be soldered to a dedicated PCB copper pour connected to COMMON. TI specifies ≥100 mm² of 2-oz copper with ≥4 thermal vias (0.3 mm diameter) to an internal ground plane. Failure to connect the pad degrades R_θJC from 17 °C/W to >40 °C/W, risking thermal shutdown at <1 A load.

Is UA7805CKTTRG3 RoHS compliant and lead-free?

Yes, UA7805CKTTRG3 is RoHS compliant and features 100% matte tin (Sn) lead finish. Its MSL rating is Level-3 (245 °C peak reflow, 168-hour floor life), and it meets JEDEC J-STD-020 moisture sensitivity requirements. The "G3" suffix explicitly denotes green (halogen-free) and RoHS-compliant packaging per TI's orderable addendum.