Texas Instruments UA78M05IKTPR

Overview

UA78M05IKTPR from Texas Instruments is a fixed-output +5 V linear voltage regulator in TO-252 (PowerFLEX) package, delivering up to 500 mA output current with internal thermal-overload and short-circuit protection. It operates over –40°C to +125°C, requires no external components for basic regulation, and is used in on-card power conditioning for portable devices and embedded controllers.

For engineers reviewing the UA78M05IKTPR datasheet, UA78M05IKTPR pinout, UA78M05IKTPR application, or UA78M05IKTPR equivalent, key selection criteria include input voltage range (7–25 V), dropout voltage (2 V), ripple rejection (62 dB at 120 Hz), output voltage tolerance (±4%), and thermal performance in the KTP package.

Technical Context

The UA78M05IKTPR implements a monolithic series-pass transistor architecture with built-in safe-area compensation, current limiting, and thermal shutdown. Its design eliminates need for external feedback networks while maintaining stable regulation under load transients and line variations.

It functions as a three-terminal fixed-voltage regulator with INPUT, OUTPUT, and COMMON pins. The device supports operation with only 0.33 µF input and 0.1 µF output capacitors, and its 2 V dropout enables use with modest input headroom in low-voltage systems.

Key Specifications

Pinout & Package

UA78M05IKTPR uses the TO-252 (KTP / PowerFLEX) surface-mount package: 6.60 mm × 6.10 mm body, single exposed thermal pad on bottom, 3-pin configuration with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2940CT-5.0/NOPB and MC78M05BDTRKG, UA78M05IKTPR offers proven legacy stability and broad design support but trades off slightly higher dropout and lower ESD rating - optimal for cost-sensitive, thermally managed industrial designs where 2 V headroom is available.

Availability

UA78M05IKTPR is available at Aetrix Electronics and suitable for industrial control I/O modules, portable medical devices, and networking edge routers requiring stable component supply and long-term manufacturability.

Supply support for UA78M05IKTPR 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 50 years of linear regulator innovation.

The UA78Mxx series was designed for on-card regulation in space-constrained systems, targeting noise-sensitive applications like computing peripherals, telecom interfaces, and portable instrumentation where simplicity and reliability are paramount.

FAQ

What is the maximum input voltage for UA78M05IKTPR?

The absolute maximum input voltage for UA78M05IKTPR is 35 V, but the recommended operating range is 7 V to 25 V per TI's SLVS059T datasheet. Exceeding 25 V continuously increases power dissipation and thermal stress, especially at full 500 mA load - sustained operation above this range risks premature thermal shutdown or reduced lifetime.

Does UA78M05IKTPR require external capacitors?

Yes, UA78M05IKTPR requires a 0.33 µF ceramic capacitor on the INPUT pin and a 0.1 µF ceramic capacitor on the OUTPUT pin, placed as close as possible to the device. These capacitors ensure stability, improve transient response, and enable the specified ripple rejection and output regulation performance documented in the UA78M05IKTPR datasheet.

Is UA78M05IKTPR pin-compatible with other TO-252 5 V regulators?

No - UA78M05IKTPR has a non-standard pinout for the TO-252 package: INPUT (Pin 1), COMMON (Pin 2), OUTPUT (Pin 3). This differs from standard TO-252 regulators like MC78M05BDTRKG (INPUT-COMMON-OUTPUT) and LM2940CT-5.0 (INPUT-GND-OUTPUT). PCB layout must match the KTP-specific pin assignment shown in TI's SLVS059T.

What is the thermal resistance of UA78M05IKTPR in its TO-252 package?

Per SLVS059T, UA78M05IKTPR (KTP package) has a junction-to-ambient thermal resistance (R_θJA) of 28°C/W and junction-to-case (bottom) thermal resistance (R_θJC(bot)) of 1.4°C/W. Effective heatsinking requires a minimum 1-inch² copper pour connected to the exposed thermal pad - derating is necessary above 85°C ambient to maintain 150°C max junction temperature.

Can UA78M05IKTPR be used in automotive applications?

UA78M05IKTPR is qualified for industrial temperature range (–40°C to +125°C), making it suitable for under-hood automotive body control units and infotainment peripherals - provided input voltage is conditioned (e.g., pre-regulated from 12 V battery) and thermal design accommodates engine bay ambient. It is not AEC-Q200 qualified, so safety-critical systems require additional validation.