onsemi MC33275MN-2.5R2G

Overview

MC33275MN-2.5R2G from onsemi is a micropower low-dropout (LDO) linear voltage regulator delivering a fixed 2.5 V output at up to 300 mA, with dropout voltage as low as 25 mV at 10 mA load and 260 mV at full load. It features internal current and thermal limiting, operates from −40°C to +125°C, and is stable with only 0.33 µF output capacitance - ideal for space-constrained battery-powered instrumentation.

For engineers reviewing the MC33275MN-2.5R2G datasheet, pinout, applications, or equivalent options, key selection criteria include its DFN-8 (4×4 mm) package, 2.5 V ±2% tolerance over temperature, ultra-low quiescent current (125 µA typ), and compatibility with ceramic, tantalum, or aluminum output capacitors.

Technical Context

The MC33275MN-2.5R2G uses a PNP pass transistor architecture enabling low dropout operation and tight line/load regulation (2.0 mV and 5.0 mV max, respectively). Its internal reference is trimmed to 1.23 V, and feedback network sets nominal 2.5 V output via external resistor ratio - though this variant is factory-fixed and non-adjustable.

Thermal shutdown activates at 150°C with no hysteresis, causing output oscillation until junction cooling occurs. Current limit is internally set to 450 mA, independent of input voltage, and works in tandem with thermal protection to prevent device damage under sustained overload or poor heatsinking.

Key Specifications

Pinout & Package

MC33275MN-2.5R2G is housed in a thermally enhanced DFN-8 (4×4 mm, 0.8 mm pitch) package with exposed thermal pad (Case 488AF). The package supports high-power dissipation via PCB copper area and is Pb-free (RoHS compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP1117ST2.5T3G and MCP1700T-2502E/MB, MC33275MN-2.5R2G uniquely balances 300 mA capability, 25 mV ultra-low dropout at light load, DFN-8 thermal efficiency, and 125 µA quiescent current - making it optimal for compact, battery-sensitive 2.5 V systems where both performance and size matter.

Availability

MC33275MN-2.5R2G is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, automotive cabin controllers, and handheld test equipment requiring stable component supply with guaranteed long-term sourcing.

Supply support for MC33275MN-2.5R2G 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 focused on energy-efficient electronics, with leadership in power management, analog, and sensing technologies.

The MC33275 series belongs to onsemi's precision linear regulator product line, designed specifically for battery-powered and thermally constrained applications demanding low dropout, low IQ, and robust protection - especially in automotive, industrial, and portable consumer markets.

FAQ

What is the maximum input voltage rating for MC33275MN-2.5R2G?

The MC33275MN-2.5R2G has an absolute maximum input voltage of 13 V DC. Exceeding this rating risks permanent damage. For reliable operation across temperature, the recommended maximum continuous input is 12 V - especially important in automotive environments where load dump transients must be clamped externally before reaching the LDO input.

Can MC33275MN-2.5R2G operate with a 2.6 V input and still regulate 2.5 V output?

Yes - at 10 mA load, MC33275MN-2.5R2G maintains regulation with only 25 mV dropout, so 2.525 V input is sufficient. At 2.6 V input and light load, the device delivers stable 2.5 V output. However, at 300 mA load, dropout rises to 260 mV, requiring ≥2.76 V input - verify minimum input under worst-case load and temperature in your design.

Is an input capacitor required for MC33275MN-2.5R2G?

Yes - a minimum 0.33 µF input bypass capacitor is recommended, placed as close as possible to pins 1 (Vin) and 2 (GND). This improves transient response and reduces sensitivity to input line impedance, especially when the LDO is fed from long traces or switching regulators. Ceramic or low-ESR tantalum types are preferred.

Does MC33275MN-2.5R2G require a specific output capacitor ESR range?

No - unlike older LDOs, MC33275MN-2.5R2G is stable with ceramic capacitors having near-zero ESR. The datasheet confirms stability with 0.33 µF MLCCs. However, for loads exceeding 200 mA, using ≥1 µF output capacitance helps dampen load-transient overshoot and improves PSRR above 10 kHz.

How does thermal shutdown behave on MC33275MN-2.5R2G during overload?

MC33275MN-2.5R2G thermal shutdown activates at ~150°C with no hysteresis. When triggered, the output disables completely; as the die cools below threshold, output resumes - causing visible oscillation in output voltage under sustained overload. This is intentional behavior, not a fault - proper PCB copper area and airflow are required to avoid repeated cycling.