onsemi MC78M05ACDTRK

Overview

MC78M05ACDTRK from onsemi is a 5.0 V, ±2% accuracy, 500 mA fixed-output linear voltage regulator in DPAK-3 (TO-252) package. It features internal thermal shutdown, short-circuit current limiting, safe-area compensation, and operates over 0°C to +125°C junction temperature. Designed for local on-card regulation in industrial power supplies and embedded control systems.

For engineers reviewing the MC78M05ACDTRK datasheet, pinout, applications, or equivalent options, key selection criteria include output accuracy (±2%), dropout voltage (2.0 V), ripple rejection (62 dB at 120 Hz), thermal protection behavior, and DPAK-3 thermal resistance (θ_JA = 92°C/W, θ_JC = 5.0°C/W).

Technical Context

The MC78M05ACDTRK implements a monolithic series-pass regulator architecture with built-in current limiting, thermal overload protection, and output transistor safe-area compensation. Its internal circuitry includes 28 active transistors and requires no external components for basic operation.

It delivers stable 5.0 V output across input voltages from 7.0 V to 20 V DC and load currents from 5.0 mA to 500 mA, with line regulation ≤50 mV and load regulation ≤20 mV under specified conditions. Ripple rejection remains ≥62 dB at 120 Hz with 100 mA output current.

Key Specifications

Pinout & Package

DPAK-3 (TO-252) surface-mount package with exposed thermal pad connected to Pin 2 (GND). Heatsink surface is electrically tied to ground terminal for optimal thermal performance and EMI control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC78M05CDTRKG and LM2940CT-5.0/NOPB, the MC78M05ACDTRK offers superior output accuracy for noise-sensitive digital loads while maintaining identical DPAK-3 footprint and thermal interface-ideal for space-constrained industrial boards requiring tight regulation without redesign.

Availability

MC78M05ACDTRK is available at Aetrix Electronics and suitable for industrial automation, embedded microcontroller power, and test equipment requiring stable component supply with consistent parametric performance and RoHS-compliant packaging.

Supply support for MC78M05ACDTRK 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The MC78M00A series was designed to deliver high-accuracy, rugged linear regulation for cost-sensitive industrial and commercial applications where thermal robustness and minimal external components are essential.

FAQ

What is the guaranteed output voltage tolerance for MC78M05ACDTRK?

The MC78M05ACDTRK guarantees ±2% output voltage tolerance at TJ = 25°C, per its "A" grade designation-tighter than the standard ±4% of the MC78M05C variant. This ensures reliable operation with 5 V logic families and analog references requiring precise DC levels.

Can MC78M05ACDTRK replace MC78M05CDTRKG in an existing design?

Yes, the MC78M05ACDTRK is pin-compatible and footprint-compatible with MC78M05CDTRKG in the DPAK-3 package. The primary upgrade is improved output accuracy (±2% vs. ±4%). No PCB changes are needed, but verify system-level tolerance margins benefit from the tighter spec.

What is the maximum input voltage the MC78M05ACDTRK can handle?

The MC78M05ACDTRK supports a maximum input voltage of 35 V DC under normal operating conditions (TA = 25°C). Absolute maximum rating is 40 V for brief transients, but sustained operation above 35 V risks exceeding safe operating area limits and triggering thermal shutdown.

Does MC78M05ACDTRK require an input bypass capacitor?

Yes-the MC78M05ACDTRK requires a minimum 0.33 µF tantalum or ceramic capacitor placed directly across Pins 1 (Input) and 2 (GND). This stabilizes operation under fast load transients and suppresses high-frequency noise from upstream sources.

How does thermal performance differ between DPAK-3 and TO-220 packages for this regulator?

The MC78M05ACDTRK in DPAK-3 has θ_JA = 92°C/W (no heatsink) and θ_JC = 5.0°C/W, whereas TO-220 variants like MC78M05CTG offer θ_JA = 70°C/W. DPAK-3 relies heavily on PCB copper area for heat dissipation; TO-220 supports bolt-on heatsinks for higher ambient or power-dissipation scenarios.