onsemi MC78L05ACPRM

Overview

MC78L05ACPRM from onsemi is a 100 mA, fixed +5.0 V positive linear voltage regulator in TO-92 package with internal short-circuit and thermal overload protection. It delivers stable output across 0°C to +125°C junction temperature, requires no external components for basic operation, and is widely used in low-power microcontroller supply rails, sensor interfaces, and industrial control logic.

For engineers reviewing the MC78L05ACPRM datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (1.7 V), output voltage tolerance (±4%), load regulation (≤60 mV), ripple rejection (41–49 dB), and thermal resistance (200°C/W in TO-92).

Technical Context

The MC78L05ACPRM employs a monolithic silicon design with built-in current limiting and thermal shutdown circuitry, eliminating need for external protection components. Its architecture uses an internal bandgap reference and error amplifier to maintain regulated output under varying line and load conditions.

It operates with a minimum input-to-output differential of 2.0 V during ripple valleys and supports capacitor-stabilized configurations using 0.33 µF input and 0.1 µF output bypass capacitors. Input bias current remains ≤6.0 mA over temperature, enabling predictable quiescent power consumption in battery-sensitive designs.

Key Specifications

Pinout & Package

MC78L05ACPRM uses the TO-92 plastic package (Case 029), with leads formed in straight-lead configuration and supplied in tape-and-reel packaging (2000 units/reel). The package features three terminals: Output, Ground, and Input - arranged in standard top-view order.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC78L05ACPREG, MC78L05ACPRM offers identical performance but optimized for bent-lead tape-and-reel handling; versus LM78L05ACZ, it delivers tighter regulation consistency and better noise suppression - critical for precision analog or mixed-signal systems.

Availability

MC78L05ACPRM is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller power supplies, and legacy RS-232 level shifter circuits requiring stable component supply and long-term production continuity.

Supply support for MC78L05ACPRM 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, and sensing solutions for automotive, industrial, and cloud infrastructure markets.

The MC78L00A series was designed to replace discrete Zener-resistor regulators in cost-sensitive, low-current applications - delivering improved regulation accuracy, thermal robustness, and simplified design-in.

FAQ

What is the maximum input voltage rating for MC78L05ACPRM?

The absolute maximum input voltage for MC78L05ACPRM is 35 Vdc for 12–18 V output variants, but per datasheet Table "Absolute Maximum Ratings", the 5 V version (MC78L05AC) has a 30 Vdc limit. Exceeding this risks permanent damage even with thermal protection active. Always maintain ≥2.0 V headroom above 5 V output for proper regulation.

Does MC78L05ACPRM require input and output capacitors for stable operation?

MC78L05ACPRM does not require capacitors for basic stability, but a 0.33 µF input capacitor is recommended when wiring exceeds 6 inches from the power supply filter, and a 0.1 µF output capacitor improves transient response. These values are specified in Figure 2 and Applications Information section of the MC78L00A datasheet.

What is the thermal resistance (R_JA) of MC78L05ACPRM in its TO-92 package?

MC78L05ACPRM in TO-92 (Case 029) has a thermal resistance of 200°C/W (Junction-to-Ambient), as confirmed in the "Thermal Characteristics" table on page 2 of the datasheet. This value assumes no heatsink and standard PCB copper layout; actual R_JA improves with added copper area.

Can MC78L05ACPRM be used as a current source?

Yes - MC78L05ACPRM can be configured as a constant-current source per Figure 9 in the datasheet. With a resistor (R) between output and load, current equals (5.0 V + I_IB) / R, where I_IB ≈ 3.8 mA. For example, R = 50 Ω yields ~100 mA, but power dissipation must stay within 625 mW limit at 25°C ambient.

Is MC78L05ACPRM compliant with automotive AEC-Q100 standards?

No - MC78L05ACPRM is rated for 0°C to +125°C junction temperature and is a commercial-grade variant. For AEC-Q100 qualified operation, use NCV78L05ABPG or NCV78L05ABPRAG (−40°C to +125°C, PPAP-capable, automotive-qualified), not MC78L05ACPRM.