onsemi MC78L08ACPRP

Overview

MC78L08ACPRP from onsemi is a 100 mA, fixed +8.0 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 ambient, requires no external components for basic operation, and supports input voltages up to 35 V - ideal for low-power industrial sensor interfaces and embedded microcontroller supply rails.

For engineers reviewing the MC78L08ACPRP datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (1.7 V typ), load regulation (8.0 mV max at ≤40 mA), ripple rejection (57 dB typ), thermal resistance (200 °C/W in TO-92), and Pb-free TO-92 packaging compliance.

Technical Context

The MC78L08ACPRP implements a monolithic series-pass transistor regulator with built-in current limiting and thermal shutdown circuitry. Its internal architecture includes a precision bandgap reference, error amplifier, and Darlington pass element - enabling stable regulation without external compensation.

It operates within a 10.5–23 V input range for nominal 8.0 V output, maintains ±3% output tolerance over temperature and load, and exhibits 60 µV RMS output noise (10 Hz–100 kHz). Dropout is defined as the minimum VI–VO differential required to sustain regulation - specified at 1.7 V typical at TJ = +25°C.

Key Specifications

Pinout & Package

MC78L08ACPRP uses the standard TO-92 plastic package (Case 029), with leads formed straight and supplied in tape-and-reel packaging. The package has no heat slug; thermal performance relies entirely on PCB copper area and lead conduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC78L08ACPRP, MC78L08ACP offers identical performance in bulk packaging for flexibility, while LM78L08ACZ trades 0.3 V higher dropout and 12 dB lower ripple rejection for broader second-source availability - making MC78L08ACPRP optimal for noise-critical, thermally constrained designs.

Availability

MC78L08ACPRP is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller power supplies, legacy equipment retrofits, and low-power analog front-ends requiring stable component supply and long-term manufacturability.

Supply support for MC78L08ACPRP 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 delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The MC78L00A Series was designed specifically for cost-sensitive, low-power linear regulation tasks - emphasizing ruggedness, simplicity, and wide operating temperature support without external components.

FAQ

What is the maximum input voltage for MC78L08ACPRP?

The absolute maximum input voltage for MC78L08ACPRP is 35 V DC for devices rated at 12–18 V output range, per the Absolute Maximum Ratings table. For reliable operation, the recommended input range is 10.5 V to 23 V to maintain regulation and avoid excessive power dissipation. Exceeding 35 V risks permanent damage even with brief transients.

Does MC78L08ACPRP require input and output capacitors?

MC78L08ACPRP does not require capacitors for basic stability, but a 0.33 µF input capacitor is recommended when the regulator is located more than ~5 cm from the power supply filter, and a 0.1 µF output capacitor improves transient response. These values are specified in the Standard Application diagram and confirmed in the datasheet's Applications Information section.

What is the thermal resistance (R_JA) of MC78L08ACPRP in its TO-92 package?

The thermal resistance, Junction-to-Ambient (R_JA), for MC78L08ACPRP in the TO-92 package is 200 °C/W, as specified in the Thermal Characteristics table. This value assumes no heatsink and standard PCB mounting; actual R_JA improves with increased copper area, but the datasheet does not define R_JC due to the plastic package construction.

Is MC78L08ACPRP RoHS compliant and Pb-free?

Yes, MC78L08ACPRP is explicitly marked as a Pb-free device in the datasheet's Ordering Information and Package Dimensions sections. It complies with RoHS Directive 2011/65/EU and is manufactured using lead-free terminations and molding compounds - confirmed by the "Pb−Free Package" note and marking diagrams.

How does the load regulation of MC78L08ACPRP compare between 1–40 mA and 1–100 mA ranges?

Per the Electrical Characteristics table, MC78L08ACPRP specifies 8.0 mV maximum load regulation for 1–40 mA and 40 mV maximum for 1–100 mA at +25°C. This reflects increasing output impedance at higher currents - critical for applications requiring tight voltage stability across full load range, such as precision analog circuits.