onsemi MC33275D-5.0G

Overview

MC33275D-5.0G from onsemi is a fixed-output 5.0 V, 300 mA micropower low dropout (LDO) linear voltage regulator in SOIC-8 package. It delivers tight line/load regulation (≤10 mV), ultra-low dropout (260 mV at 300 mA), and operates across −40°C to +125°C ambient. It is designed for battery-powered instrumentation requiring extended runtime and stable low-noise supply.

For engineers reviewing the MC33275D-5.0G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, quiescent current (125–200 µA), thermal shutdown threshold (150°C), output stability with ≥0.22 µF ceramic capacitor, and SOIC-8 PCB layout compatibility.

Technical Context

The MC33275D-5.0G uses a PNP pass transistor architecture enabling low dropout operation down to 25 mV at 10 mA and 260 mV at 300 mA. Its internal reference (1.23 V) feeds an error amplifier controlling the pass element, with built-in current limiting (450 mA typical) and thermal shutdown (150°C junction).

It achieves stable regulation with minimal external components: only a 0.22 µF ceramic output capacitor is required for 5.0 V output, and no input capacitor is mandatory-though 0.33 µF is recommended for transient immunity. Ripple rejection exceeds 65 dB at 120 Hz, and output noise is 46 µV_RMS (10 Hz–100 kHz, 200 µF C_OUT).

Key Specifications

Pinout & Package

MC33275D-5.0G is housed in a Pb-free SOIC-8 (Case 751) package, 4.9 mm × 6.0 mm × 1.5 mm, with exposed pad not electrically connected. Thermal resistance is R_JA = 160°C/W (no copper pour) and R_JC = 25°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP1117ST50T3G and MCP1700T-5002E/MB, MC33275D-5.0G uniquely balances 300 mA capability, 260 mV dropout, 125 µA quiescent current, and integrated thermal/current protection in a standard SOIC-8 footprint-making it optimal for mid-power portable electronics where efficiency, reliability, and layout simplicity are jointly critical.

Availability

MC33275D-5.0G is available at Aetrix Electronics and suitable for battery-powered consumer products, hand-held instruments, and camcorders requiring stable component supply with long-term manufacturability and automotive-grade reliability options.

Supply support for MC33275D-5.0G 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, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The MC33275 series belongs to onsemi's precision linear regulator product line, engineered for low-noise, low-dropout operation in battery-constrained and thermally demanding environments-targeting instrumentation, medical, and portable industrial applications.

FAQ

What is the minimum input voltage required for MC33275D-5.0G to maintain regulation at 300 mA load?

The MC33275D-5.0G requires a minimum input voltage of 5.26 V to sustain 5.0 V output regulation at 300 mA, based on its maximum dropout voltage of 260 mV. Below this, output voltage drops linearly with input; operation below 5.26 V is permissible but results in unregulated output. This value is confirmed across −40°C to +125°C ambient per the datasheet's electrical characteristics table.

Can MC33275D-5.0G operate with a 0.1 µF ceramic output capacitor?

No-MC33275D-5.0G requires a minimum of 0.22 µF ceramic output capacitor for stability at 5.0 V output, as explicitly stated in the Applications Information section. Using 0.1 µF risks oscillation or poor transient response. The device is optimized for capacitors ≥0.22 µF with ESR <1 Ω; solid tantalum or multilayer ceramic types are recommended.

Does MC33275D-5.0G include reverse polarity protection?

No, MC33275D-5.0G does not integrate reverse polarity protection. The datasheet specifies absolute maximum input voltage as 13 V but does not define a negative input rating. Applying reverse voltage (e.g., −0.3 V) may damage the IC. External protection-such as a series Schottky diode or MOSFET-based ideal diode-is required if reverse input is possible in the system.

How does thermal shutdown behave in MC33275D-5.0G during sustained overload?

MC33275D-5.0G thermal shutdown activates at ~150°C junction temperature with no hysteresis. During sustained overload, the output disables, junction cools, then re-enables-causing visible output oscillation. This cycling continues until ambient or PCB thermal design reduces power dissipation. The datasheet cautions that thermal limit is not a substitute for proper heatsinking or derating.

Is MC33275D-5.0G pin-compatible with other SOIC-8 LDOs like MIC5205-5.0YM?

No-MC33275D-5.0G is not pin-compatible with MIC5205-5.0YM or most other SOIC-8 LDOs. Its pin 1 is Vin, pins 2–3 are GND, pins 4–5 and 7–8 are N/C, and pin 6 is Vout. In contrast, MIC5205 uses pin 1=GND, pin 2=VIN, pin 3=EN, pin 4=VOUT, and pins 5–8=N/C. PCB layout must be designed specifically for MC33275D-5.0G's unique pin assignment.