Microchip Technology MIC5239YM

The MIC5239YM is an adjustable, 500 mA low-dropout linear regulator for applications requiring a settable local rail from a higher-voltage source. Microchip specifies a 2.3 V to 30 V operating input range and an adjustable output range of 1.24 V to 20 V using two external resistors. The YM suffix identifies the -40°C to +125°C junction-temperature grade and eight-lead SOIC package; the unsuffixed media code denotes tube delivery, 95 devices per tube in the manufacturer's ordering scheme.

• Adjustable output using the ADJ feedback input and two external resistors; 1.23 V reference in the application equation.
• 350 mV typical dropout at 500 mA; actual headroom varies with operating conditions.
• Logic-compatible active-high enable; shutdown ground-pin current is 0.1 µA typical at VIN = 30 V and VEN ≤ 0.6 V.
• Stable with the data-sheet output-capacitor arrangement; 3.3 µF output capacitance is specified for stability.
• Current limiting, thermal shutdown, overvoltage shutdown, reverse-leakage and reverse-battery protection are described for the family.
• Power SOIC uses four ground leads to conduct heat into the PCB ground copper.

Registered catalog package: 8-SOIC (0.154", 3.90 mm width). Microchip's M code is its eight-lead SOIC package, Y is the -40°C to +125°C junction grade, and blank media suffix means 95 pieces per tube for the SOIC option. The generic package image illustrates the body and lead format; use the manufacturer's package drawing and land pattern to finalize mechanical dimensions.

The adjustable variant is marked MIC5239YM in the data sheet's package-marking example. Confirm the full ordering code and traceability on the supplied tube or device label.

For the adjustable eight-lead SOIC top view: pin 1 EN, pin 2 ADJ, pin 3 IN, pin 4 OUT, and pins 5–8 GND. EN controls shutdown, ADJ senses the external divider, IN accepts the supply, OUT provides the regulated output, and the four GND leads provide electrical and thermal connection. Verify pin-1 orientation against the Microchip package drawing before layout or assembly.

Typical values are not guaranteed limits. Apply the manufacturer's test conditions, absolute limits and thermal curves when setting design margins.

Compare any candidate against the MIC5239YM adjustable output range, ADJ pin at position 2, enable behavior, 2.3 V to 30 V operating VIN, capacitor stability, dropout, current limit, SOIC footprint and board-level thermal budget. A fixed-voltage MIC5239 has a different pin-2 function and is not a drop-in adjustable substitute. The MIC5239YM-TR ordering scheme identifies the same adjustable SOIC die supplied on reel rather than in a tube; verify the requested delivery medium. No unverified LCDChip replacement link is included.

Microchip data sheet DS20006544A explicitly lists MIC5239YM as an adjustable-output eight-lead SOIC regulator for a -40°C to +125°C junction-temperature range, with 95 per tube. Its adjustable application section specifies the 1.24 V to 20 V output range and external resistor network. Use the latest manufacturer-controlled documentation for final design review.

Specify the complete MIC5239YM code and check device marking, SOIC geometry, tube label, date or lot traceability, and applicable quality documentation during receiving. A generic package picture cannot authenticate an individual unit.

Is MIC5239YM a fixed-voltage 3.3 V regulator?

No. The blank output-voltage code denotes the adjustable version. It needs an external feedback divider to select the rail voltage.

What output range is specified?

Microchip describes 1.24 V to 20 V for the adjustable application, within the device's operating and headroom limits.

How is the output set?

The application circuit uses two resistors and VOUT = VREF × (1 + R1/R2), with VREF = 1.23 V; the feedback resistor R2 should not exceed 300 kΩ.

Does this version provide an error flag?

No. Pin 2 is ADJ on the adjustable SOIC version; the fixed-output version uses FLG there.

What is the delivery format?

The unsuffixed SOIC ordering option is 95 per tube in the manufacturer identification table. Confirm the supplied medium on the label.

Calculate the divider, dropout headroom and worst-case power dissipation for the intended VIN, VOUT, load and ambient temperature. The 500 mA family capability does not imply 500 mA is thermally usable at every input-output voltage difference. Connect the four ground leads to adequate copper, follow the data-sheet capacitor guidance and validate the assembled rail under startup, shutdown and fault conditions. This summary does not replace the Microchip data sheet.