Texas Instruments UA79M05CKVURG3

Overview

UA79M05CKVURG3 from Texas Instruments is a fixed-negative-voltage linear regulator delivering −5 V output at up to 500 mA, featuring internal short-circuit and thermal protection, 1.1 V dropout voltage, and ±2% output voltage tolerance over 0°C to 125°C. It operates with input voltages from −7 V to −25 V and is used in industrial power supplies, embedded system local regulation, and analog subsystem biasing.

For engineers reviewing the UA79M05CKVURG3 datasheet, UA79M05CKVURG3 pinout, UA79M05CKVURG3 application, or UA79M05CKVURG3 equivalent, key selection criteria include negative-output LDO capability, TO-252 (KVU) thermal pad package compatibility, ripple rejection ≥54 dB at 120 Hz, and junction temperature operation up to 125°C.

Technical Context

This device implements a monolithic PNP pass transistor architecture with safe-area compensation and internal current limiting. Its feedback loop maintains regulated output without external components, and its thermal shutdown activates at ~150°C virtual junction temperature.

The UA79M05CKVURG3 uses a three-terminal configuration (Input, Output, Common) with fixed −5 V reference derived from bandgap-stabilized circuitry. Ripple rejection performance is specified under 120 Hz sinusoidal input perturbation with 300 mA load, confirming suitability for post-rectifier filtering in AC/DC converters.

Key Specifications

Pinout & Package

UA79M05CKVURG3 is housed in a TO-252 (KVU) surface-mount package with an exposed thermal pad for enhanced heat dissipation. The package measures 6.70 mm × 6.22 mm × 2.52 mm max height and requires soldering to a PCB thermal pad per TI SLMA002/SLMA004 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM79M05CDT/NOPB and UA79L05CKCS, the UA79M05CKVURG3 provides superior ripple rejection (≥54 dB vs. 50 dB), lower dropout (1.1 V vs. 1.3 V), and higher output current (500 mA vs. 100 mA), making it optimal for compact, noise-critical, and higher-load industrial power rails.

Availability

UA79M05CKVURG3 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for UA79M05CKVURG3 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 power management ICs with broad industrial and automotive design-in leadership.

The UA79M05CKVURG3 belongs to TI's legacy 79Mxx negative-voltage regulator family, engineered for robust on-card regulation in noise-sensitive systems where elimination of distribution losses and single-point supply artifacts is critical.

FAQ

What is the maximum input voltage for UA79M05CKVURG3?

The absolute maximum input voltage for UA79M05CKVURG3 is −35 V, but the recommended operating range is −7 V to −25 V. Exceeding −25 V may degrade long-term reliability even if within absolute maximum ratings, and operation below −7 V fails to maintain regulation. Always use input capacitors rated for the full applied voltage swing.

Does UA79M05CKVURG3 require external capacitors?

Yes, UA79M05CKVURG3 requires a 2 µF input capacitor and a 1 µF output capacitor for stable operation per the datasheet test conditions. Ceramic capacitors are acceptable, but ensure the output capacitor has sufficient ESR (≥0.1 Ω) to prevent oscillation - TI recommends X7R dielectric with 10% tolerance.

What is the thermal resistance (θJA) of UA79M05CKVURG3 in its TO-252 package?

The published junction-to-ambient thermal resistance (θJA) for UA79M05CKVURG3 in TO-252 (KVU) package is 28°C/W under high-K board conditions per JESD 51-5. Real-world θJA depends heavily on PCB copper area under the exposed thermal pad; doubling the pad size typically improves θJA by ~15%.

Can UA79M05CKVURG3 be used in adjustable configurations?

Yes, UA79M05CKVURG3 can be configured as an adjustable regulator using external resistors to set output voltage, though this requires modifying the common terminal connection and adding feedback components. The datasheet confirms this capability, noting that the device functions as a power-pass element in precision regulator topologies when used with external error amplifiers.

Is UA79M05CKVURG3 pin-compatible with other TO-252 negative regulators?

No documented pin-compatible replacements exist for UA79M05CKVURG3 in TO-252. While LM79M05CDT/NOPB shares the same pinout (Input–Ground–Output), its electrical behavior differs in dropout and ripple rejection, so direct substitution requires validation. Always verify layout compatibility and thermal performance before replacement.