Texas Instruments UA7805CKTTR

Overview

UA7805CKTTR from Texas Instruments is a fixed +5 V, 1.5 A linear voltage regulator in TO-263 (DDPAK) package with thermal overload protection, short-circuit current limiting, and output capacitor–free stability. It delivers regulated 5 V output across 0°C to 125°C ambient, supports input voltages from 7 V to 25 V, and is used for on-card regulation in embedded power supplies.

For engineers reviewing the UA7805CKTTR datasheet, UA7805CKTTR pinout, UA7805CKTTR application, or UA7805CKTTR equivalent, key selection factors include dropout voltage (2 V at 1 A), ripple rejection (62–78 dB at 120 Hz), output noise (40 µV RMS), thermal shutdown behavior, and TO-263 surface-mount compatibility for high-power density designs.

Technical Context

The UA7805CKTTR implements a monolithic NPN series-pass transistor architecture with internal safe-area compensation and bias current–controlled current limiting. Its thermal shutdown activates when junction temperature exceeds ~150°C, reducing output current to limit die temperature.

It operates as a three-terminal positive regulator requiring only input and output capacitors (0.33 µF and 0.1 µF respectively) for stability-no external feedback network needed. The device maintains regulation under load currents from 5 mA to 1.5 A and tolerates input-to-output differentials up to 25 V.

Key Specifications

Pinout & Package

UA7805CKTTR uses the TO-263 (KTT / DDPAK) 3-pin surface-mount package with exposed thermal pad (10.06 mm × 9.02 mm body). The case serves as the COMMON (GND) terminal, enabling direct PCB thermal coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM7805CDT and MC7805BDTG, UA7805CKTTR offers superior thermal resistance (25.3°C/W vs 65°C/W) and higher guaranteed output current (1.5 A vs 1.0 A), making it preferred for compact, high-current 5 V point-of-load applications where board space and heatsinking are constrained.

Availability

UA7805CKTTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, embedded microcontroller power systems, and telecom point-of-load regulation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for UA7805CKTTR 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 ICs, with decades of expertise in high-reliability linear regulators and industrial-grade components.

The UA7805CKTTR belongs to TI's µA78xx family of fixed-voltage linear regulators, designed specifically for robust on-card regulation in harsh environments-emphasizing thermal resilience, fault immunity, and ease of use in cost-sensitive industrial and computing power systems.

FAQ

What is the maximum input voltage for UA7805CKTTR?

The absolute maximum input voltage for UA7805CKTTR is 35 V, but the recommended operating range is 7 V to 25 V per the datasheet. Exceeding 25 V increases power dissipation and thermal stress without functional benefit, and operation above 35 V risks permanent damage. Always verify input transient conditions-including overshoot-against this limit when designing with UA7805CKTTR.

Does UA7805CKTTR require an output capacitor to remain stable?

No-UA7805CKTTR is internally compensated and stable with only a 0.1 µF ceramic output capacitor, as confirmed in Section 7.5 and Figure 2 of the SLVS056P datasheet. This eliminates reliance on larger, less reliable electrolytic capacitors and simplifies layout. However, omitting the capacitor or using values significantly below 0.1 µF may cause oscillation or poor transient response in UA7805CKTTR.

Can UA7805CKTTR be used in adjustable-output configurations?

Yes-UA7805CKTTR can be configured as an adjustable regulator using external resistors and a reference diode, as shown in Figure 7 of the datasheet. While optimized for fixed 5 V operation, its internal architecture supports such modifications. Note that accuracy, line/load regulation, and thermal performance in adjustable mode depend on external component selection and layout-UA7805CKTTR itself does not guarantee specs outside its fixed-output characterization.

What is the thermal resistance (θ_JA) of UA7805CKTTR in standard PCB layout?

UA7805CKTTR has a junction-to-ambient thermal resistance (θ_JA) of 25.3°C/W when mounted on a standard JEDEC High-K test board per the datasheet's Table 7.4. Real-world θ_JA depends heavily on PCB copper area, layer count, and airflow; designs achieving <15°C/W require ≥4 in² of 2-oz copper connected to the exposed pad. This value directly determines safe continuous power dissipation for UA7805CKTTR.

Is UA7805CKTTR RoHS compliant and lead-free?

Yes-UA7805CKTTR is RoHS compliant and features 100% matte tin (SN) lead finish, as documented in TI's Package Option Addendum (Orderable part number UA7805CKTTR, MSL Level-3, peak reflow 245°C). It meets EU RoHS Directive 2011/65/EU and is suitable for lead-free assembly processes without requiring special handling or exemptions-critical for global electronics manufacturing of UA7805CKTTR.