onsemi MC7805CDTRK

Summary of MC7805CDTRK onsemi linear voltage regulator

The MC7805CDTRK from onsemi is a member of the widely trusted MC7800 series of fixed linear voltage regulators, offered in a DPAK surface-mount package. Designed to deliver a regulated 5V output at currents up to 1A, the MC7805CDTRK is engineered for use in local, on-card regulation and general-purpose power management across industrial, consumer, and automotive applications. This device is characterized by its monolithic integration, minimal external component requirement, and robust performance over an extended temperature range (0℃ to 125℃).

As a positive, fixed-output regulator, the MC7805CDTRK simplifies power subsystem design where a stable 5V rail is required. Its DPAK (TO-252-3, SC-63) package offers flexibility for automated assembly and thermal management on PCBs, supporting modern design-in and manufacturing processes.

Technical and operational details of MC7805CDTRK onsemi

Central to the MC7805CDTRK's appeal is its electrical stability and resilience under varied operating conditions. The device supports a broad input voltage range, with a recommended maximum input of 35V and a fixed output of 5V. At a load of 1A, the typical voltage dropout is 2V, enabling designers to accommodate supply variations while maintaining output regulation.

Key performance features include:

Output current in excess of 1A, with safe operation under continuous load.

Output voltage tolerance typically to 1.5%, with variants offering 2% and 4% for tighter or looser regulation needs.

Power supply ripple rejection (PSRR) measured at 83dB at 120Hz, crucial for noise-sensitive applications.

Quiescent current of 6.5mA, supporting energy-efficient power budgets.

Stable operation is achievable without a load capacitor, though output and input bypassing are recommended for optimal transient response and high-frequency stability.

Temperature performance is robust. Output voltage exhibits minimal drift over the 0℃ to 125℃ junction temperature range, with line and load regulation maintained by pulse-testing techniques to minimize self-heating and ensure consistent regulator behavior. Graphs available in the technical documentation illustrate output voltage stability, ripple rejection curves, output impedance, and quiescent current behavior, supporting detailed engineering assessment.

MC7805CDTRK onsemi package dimensions and physical properties

The MC7805CDTRK comes in the DPAK (TO-252-3, SC-63) surface-mount package, enabling high-density PCB layouts and automated assembly. The physical construction facilitates efficient heat transfer from the regulator to the PCB, a key consideration when operating at elevated currents.

Recommended mounting footprints and thermal performance curves are provided, illustrating worst-case power dissipation, thermal resistance, and maximum power dissipation as a function of PCB copper length and ambient temperature. For power supply engineers, these characteristics underpin reliability assessments and help define requirements for system-level heatsinking, especially in compact designs.

Device marking conforms to onsemi’s standardized notation, with assembly location, wafer lot, work week, and year codes included for traceability. The product is not RoHS compliant, and is classified under MSL 1 (unlimited), with no restrictions from REACH. ECCN is EAR99 for export considerations.

Safety and durability attributes in MC7805CDTRK onsemi

The MC7805CDTRK is equipped with a comprehensive suite of protection features:

Internal thermal overload protection automatically disables the output during overheating scenarios, safeguarding both the device and downstream circuitry.

Internal short circuit current limiting ensures that excessive load or output faults do not result in catastrophic failure.

Output transistor safe-area compensation dynamically reduces short circuit current as the voltage differential increases, extending operational robustness well beyond traditional linear regulators.

The device incorporates ESD protection exceeding 2000V Human-Body Model and 200V Machine Model standards.

These reliability features support use in demanding environments and applications where input surges, overcurrent events, or system faults may occur.

Usage guidelines for MC7805CDTRK onsemi

While designed primarily as a fixed 5V regulator, the MC7805CDTRK demonstrates versatile use cases in practical engineering scenarios:

As a voltage source, it can regulate systems with varying supply input, provided the input always exceeds the output by the dropout margin (typically 2V).

As a current source, when used in suitable application circuits, output current can be determined by external resistor values.

Current boosting is achievable by pairing with external power transistors (e.g., MJ2955 for currents up to 5A), ideal for demanding load requirements.

Adjustable output configurations can be realized with operational amplifiers or external component modifications.

Short-circuit protection can be extended via external circuits, as recommended in the technical documentation.

PCB layout, input/output capacitor selection, and grounding must be managed to optimize transient response and minimize noise. In high-current or temperature-critical applications, heatsinking and copper area on the PCB should match thermal dissipation characteristics provided in the datasheet.

Alternative and substitute options for MC7805CDTRK onsemi

With the MC7805CDTRK designated as obsolete, engineers should consider alternate models for new designs. Within the onsemi portfolio, the MC7800, MC7800A, MC7800AE, and NCV7800 series offer similar fixed regulators in multiple voltage options and package configurations.

For automotive or extended temperature applications, NCV-prefixed variants (e.g., NCV7805) provide -40°C to +125°C range and are AEC-Q100 qualified. Alternative packaging is available where DPAK may not be suitable, including D²PAK and TO-220. Other industry-standard 7805 regulators from reputable manufacturers can also serve as direct replacements, though careful matching of protection, electrical, and mechanical characteristics is essential.

Conclusion

The onsemi MC7805CDTRK linear voltage regulator remains a reference device for stable 5V power delivery, valued for its integration, protection features, and proven reliability. As the component is now obsolete, engineers and procurement professionals are encouraged to review alternative MC7800 series devices and compatible equivalents, ensuring continued system performance and compliance with contemporary production, environmental, and safety requirements. Detailed datasheet analysis, understanding of mechanical and thermal considerations, and awareness of potential replacements will facilitate robust product selection for next-generation designs.