Texas Instruments UA79M05CKTPR

Overview

UA79M05CKTPR from Texas Instruments is a fixed-negative-voltage linear regulator delivering −5 V output at up to 500 mA, featuring internal short-circuit current limiting, thermal shutdown, and safe-area compensated output transistor. It operates across 0°C to 125°C junction temperature and requires no external components for basic regulation in industrial power supplies and embedded control rails.

For engineers reviewing the UA79M05CKTPR datasheet, UA79M05CKTPR pinout, UA79M05CKTPR application, or UA79M05CKTPR equivalent, key selection criteria include guaranteed −5 V output tolerance (±50 mV over full temp/load), dropout voltage of 1.1 V, ripple rejection ≥54 dB at 120 Hz, and PowerFLEX (KTP) package thermal resistance θJA = 28°C/W.

Technical Context

This device implements a monolithic PNP pass transistor with on-chip current limiting, thermal overload protection, and output safe-area compensation-enabling robust operation under sustained overload without external foldback circuitry. Its negative-output architecture complements the µA78M00 positive-regulator series for dual-rail systems.

Designed for fixed-voltage operation, UA79M05CKTPR supports adjustable configurations via external resistors but does not integrate error amplifier compensation pins or enable/disable logic. Input voltage range is specified as −7 V to −25 V, with absolute maximum input at −35 V.

Key Specifications

Pinout & Package

UA79M05CKTPR uses the PowerFLEX (KTP) surface-mount package-a 2-terminal thermally enhanced variant with exposed pad-designed for automated assembly and improved heat dissipation over through-hole TO-220 alternatives. Pin count is 2: INPUT and OUTPUT; COMMON is internally connected to the exposed thermal pad and must be soldered to a large copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UA79M05CKTPR, UA79M05CKVURG3 offers RoHS compliance and SMT manufacturability at the cost of higher thermal resistance, while LM79M05CDT provides functional equivalence with minor noise and bias-current variances-neither is pin-compatible due to differing 2-pin (KTP) vs. 3-pin (DPAK) terminations.

Availability

UA79M05CKTPR is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply despite its obsolete status-inventory is secured from verified legacy channels with full traceability.

Supply support for UA79M05CKTPR 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal technologies since 1930.

The µA79Mxx series was developed as a complementary negative-output counterpart to the µA78Mxx positive regulators, targeting on-card regulation in industrial and automotive systems where noise immunity and reliability under overload are critical.

FAQ

What is the maximum input voltage for UA79M05CKTPR?

The absolute maximum input voltage for UA79M05CKTPR is −35 V. Operation beyond this risks permanent damage. The recommended operating range is −7 V to −25 V, ensuring stable −5 V output regulation across temperature and load. Exceeding −25 V may degrade ripple rejection and increase dropout losses, so design margins should maintain VI within spec.

Does UA79M05CKTPR require external capacitors?

Yes, UA79M05CKTPR requires a 2-µF capacitor on the input and a 1-µF capacitor on the output for stability and transient response, as specified in the datasheet test conditions. Omitting either capacitor risks oscillation or poor load-step performance. Ceramic or tantalum types are acceptable, but ESR must remain within 0.1–0.2 Ω per datasheet guidelines.

Is UA79M05CKTPR pin-compatible with TO-220 versions like UA79M05CKC?

No, UA79M05CKTPR is not pin-compatible with UA79M05CKC or other TO-220 variants. UA79M05CKTPR uses a 2-terminal PowerFLEX (KTP) package where COMMON is the exposed thermal pad-not a discrete pin-while TO-220 versions have three physical leads (INPUT, OUTPUT, COMMON). PCB layout and thermal design differ fundamentally.

What is the thermal performance of UA79M05CKTPR on a standard PCB?

On a high-thermal-conductivity PCB per JESD 51-5, UA79M05CKTPR achieves θJA = 28°C/W. With TJ(max) = 150°C and TA = 70°C, maximum continuous power dissipation is PD = (150 − 70)/28 ≈ 2.86 W. At −5 V output and 500 mA load, dissipation is ~6.05 W at VI = −17 V-requiring careful thermal design or derating below full current.

Can UA79M05CKTPR be used in adjustable configurations?

Yes, UA79M05CKTPR can be configured as an adjustable regulator using external resistors to set output voltage, as noted in the datasheet. However, it lacks dedicated feedback pins-the adjustment is implemented between COMMON and OUTPUT terminals, requiring careful attention to bias current injection and stability compensation. Fixed −5 V operation remains its primary validated use case.