Texas Instruments UA78M05IKTPRG3

Overview

UA78M05IKTPRG3 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 and requires only 0.33 µF input and 0.1 µF output capacitors for stable regulation - used in embedded power rails for industrial controllers and portable instrumentation.

For engineers reviewing the UA78M05IKTPRG3 datasheet, UA78M05IKTPRG3 pinout, UA78M05IKTPRG3 application, or UA78M05IKTPRG3 equivalent, key selection criteria include dropout voltage (2 V), ripple rejection (62 dB at 120 Hz), output voltage tolerance (±4%), thermal shutdown behavior, and compatibility with standard PCB layout practices for TO-252 devices.

Technical Context

This device implements a monolithic series-pass linear regulator architecture with built-in safe-area compensation for the output transistor, enabling robust operation under transient overload and thermal stress. Its internal current limiting (300 mA short-circuit current) and thermal shutdown activate independently to prevent damage without external circuitry.

The UA78M05IKTPRG3 is specified for industrial temperature range (–40°C to +125°C) and supports input voltages from 7 V to 25 V. Its 62 dB ripple rejection at 120 Hz and 40–200 µV output noise make it suitable for analog-sensitive subsystems where switching regulator noise must be suppressed.

Key Specifications

Pinout & Package

UA78M05IKTPRG3 uses the TO-252 (KTP / PowerFLEX) 3-pin surface-mount package with exposed thermal pad (JEDEC TO-252-AC variant). The package measures 6.60 mm × 6.10 mm and is optimized for high-power dissipation on standard PCB copper areas.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM78M05CDT-TR, UA78M05IKTPRG3 offers superior thermal resistance and industrial temperature range; versus TLV76750DRVR, it trades lower dropout for simpler design, no external components, and proven ruggedness in harsh environments.

Availability

UA78M05IKTPRG3 is available at Aetrix Electronics and suitable for industrial automation, portable medical instrumentation, and telecom infrastructure requiring stable component supply with long-term lifecycle support.

Supply support for UA78M05IKTPRG3 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 decades of expertise in power management ICs.

The UA78Mxx series was designed for cost-effective, robust on-card regulation in industrial and computing systems - prioritizing simplicity, reliability, and wide-temperature operation over ultra-low quiescent current or adjustable output.

FAQ

What is the maximum input voltage for UA78M05IKTPRG3?

The absolute maximum input voltage for UA78M05IKTPRG3 is 35 V, but the recommended operating range is 7 V to 25 V per TI's SLVS059T datasheet. Exceeding 25 V increases power dissipation and thermal stress without functional benefit, and operation above 35 V risks permanent damage. For reliable 500 mA output, maintain input within this window.

Does UA78M05IKTPRG3 require external capacitors?

Yes - UA78M05IKTPRG3 requires a 0.33 µF ceramic capacitor on the INPUT pin and a 0.1 µF ceramic capacitor on the OUTPUT pin, as specified in the datasheet's Typical Application section. Omitting either capacitor may cause instability, oscillation, or degraded ripple rejection. These values are mandatory for compliance with published electrical characteristics.

Is UA78M05IKTPRG3 pin-compatible with other TO-252 5 V regulators?

UA78M05IKTPRG3 follows the standard TO-252 (KTP) pinout: Pin 1 = INPUT, Pin 2 = COMMON (GND), Pin 3 = OUTPUT. This matches industry-standard TO-252 linear regulators like LM78M05 variants, but always verify pin function labels on the specific device's datasheet - some manufacturers swap COMMON and OUTPUT positions.

What is the thermal performance of UA78M05IKTPRG3 in TO-252 package?

UA78M05IKTPRG3 in TO-252 (KTP) package has RθJC(bottom) = 1.4 °C/W and RθJA = 30.3 °C/W with standard JEDEC 2S2P copper. This enables >1.5 W continuous power dissipation with appropriate PCB copper area, significantly outperforming TO-220 or SOT-223 variants in space-constrained designs.

Can UA78M05IKTPRG3 be used in automotive applications?

UA78M05IKTPRG3 is qualified for –40°C to +125°C operation and features internal thermal shutdown and short-circuit protection - making it suitable for non-safety-critical automotive body electronics (e.g., interior lighting control, HVAC sensors). However, it is not AEC-Q100 qualified, so it should not be used in safety-critical or powertrain systems without additional validation.