Microchip Technology MIC5504-1.8YM5-TR

The MIC5504-1.8YM5-TR provides a regulated 1.8 V rail from a 2.5 V to 5.5 V input and supports loads up to 300 mA. Its low typical ground current, ceramic-capacitor stability, active-high shutdown control, current limiting, and thermal shutdown suit compact battery-powered and general-purpose point-of-load rails.

The exact M5 order-code suffix identifies Microchip's 5-lead SOT-23 package. The catalog package field lists the JEDEC-style aliases SC-74A and SOT-753; the registered SOT-753 image and path are used here.

Layout checks

• Verify the SOT23-5 pin-1 orientation before footprint release.
• Place the 1 microfarad input capacitor close to VIN and GND.
• Place the 1 microfarad output capacitor close to VOUT and GND.
• Check junction temperature from input-output voltage drop, load current, board copper, and ambient temperature.

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The following pin assignment is for the M5 SOT23-5 package.

Do not infer the UDFN pin numbering from this table; this order code uses the five-lead SOT-23 pin map.

Typical and maximum values depend on the stated electrical test conditions. For a 1.8 V output, available headroom is also constrained by the 2.5 V minimum input operating rating.

Replacement selection must preserve the 1.8 V fixed output, 300 mA load requirement, SOT23-5 footprint and pin order, 2.5 V to 5.5 V input range, active-high enable behavior, internal enable pull-down, and automatic output discharge. Other MIC550x family members or other MIC5504 voltage options can differ in package, fixed voltage, pull-down behavior, and discharge behavior, so they are not unconditional substitutes.

No internal replacement link is asserted without an exact catalog match and an engineering review of electrical and mechanical compatibility.

Microchip Technology identifies MIC5504 as a single 300 mA LDO with both output auto-discharge and an internal enable pull-down. The `-1.8` segment specifies the 1.8 V output, `Y` specifies the -40 degrees C to +125 degrees C junction-temperature option, `M5` specifies the five-lead SOT-23 package, and `TR` is the tape-and-reel media designator.

Confirm the full order code, reel label, package marking, pin-1 indicator, and traceability information during incoming inspection. Electrical verification should use the limits and conditions in the latest manufacturer-controlled data sheet. Package appearance alone does not establish authenticity or compliance.

Validate dropout headroom, load transients, capacitor bias derating, thermal rise, enable thresholds, discharge timing, and the exact SOT23-5 land pattern in the final circuit. Do not exceed the operating ratings, and calculate junction temperature from actual input voltage, output voltage, load current, ambient temperature, and board thermal conditions.