Microchip Technology MIC5365-1.2YD5-T5

Overview

MIC5365-1.2YD5-T5 from Micrel is a fixed-output 1.2V, 150mA low-dropout linear regulator in a 5-pin TSOT23 package, delivering ±2% initial output accuracy, 155mV dropout at full load, and 29µA quiescent current-designed for power-sensitive portable electronics such as GPS modules and handheld devices.

For engineers reviewing the MIC5365-1.2YD5-T5 datasheet, MIC5365-1.2YD5-T5 pinout, MIC5365-1.2YD5-T5 application, or MIC5365-1.2YD5-T5 equivalent, key selection criteria include input voltage range (2.5V–5.5V), thermal shutdown protection, stability with 1µF ceramic output capacitors, and zero-off-mode current draw (<1µA) during disable.

Technical Context

The MIC5365-1.2YD5-T5 employs a CMOS-based pass element with active-high enable control and internal current limiting. Its architecture supports fast load transient response and maintains regulation down to zero load without external compensation.

It operates across –40°C to +125°C junction temperature, features 70dB PSRR up to 1kHz, and draws only 29µA ground current under light load-enabling long battery life in always-on subsystems while rejecting supply noise from adjacent switching regulators.

Key Specifications

Pinout & Package

Package: 5-Pin TSOT23 (Thin Small Outline Transistor), RoHS-compliant, 1.6mm × 2.9mm footprint, exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC5365-1.2YC5 and TPS7A0512PDBVR, the MIC5365-1.2YD5-T5 offers the smallest footprint among its family variants and retains the NC pin for mechanical stability, while maintaining identical regulation accuracy and PSRR-making it optimal for space-constrained, thermally managed portable designs.

Availability

MIC5365-1.2YD5-T5 is available at Aetrix Electronics and suitable for GPS modules, handheld medical devices, digital camera sensor biasing, and portable industrial data loggers requiring stable component supply with consistent parametric performance across production lots.

Supply support for MIC5365-1.2YD5-T5 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

Micrel Inc. was a U.S.-based semiconductor company specializing in power management, analog, and RF solutions before its acquisition by Microchip Technology in 2015.

The MIC5365 series belongs to Micrel's high-performance LDO family, engineered specifically for ultra-portable electronics demanding minimal board area, low quiescent current, and robust transient response under variable load conditions.

FAQ

What is the maximum input voltage for MIC5365-1.2YD5-T5?

The MIC5365-1.2YD5-T5 supports an absolute maximum input voltage of 6V, but its recommended operating range is 2.5V to 5.5V. Exceeding 5.5V may trigger internal protection or degrade long-term reliability. The 155mV dropout at 150mA means it can regulate 1.2V output from as low as 1.355V input-ideal for single-cell Li-ion systems where VIN drops near end-of-discharge.

Does MIC5365-1.2YD5-T5 require an output capacitor, and what type is recommended?

Yes, MIC5365-1.2YD5-T5 requires a minimum 1µF ceramic output capacitor for stability. X5R or X7R dielectric types are strongly recommended due to their stable capacitance over temperature and voltage; Y5V dielectrics are not advised because they lose >50% capacitance across operating range. The regulator remains stable even with zero load, eliminating need for dummy loads in low-power keep-alive applications.

How does the enable pin (EN) function on MIC5365-1.2YD5-T5?

The EN pin on MIC5365-1.2YD5-T5 is active-high: logic high ≥1.2V enables regulation, logic low ≤0.2V disables output and places MIC5365-1.2YD5-T5 into zero-off-mode with <1µA current draw. It must never be left floating-uncontrolled states may cause erratic output behavior. A pull-down resistor (e.g., 100kΩ) is recommended if driven by open-drain logic.

What is the thermal performance of MIC5365-1.2YD5-T5 in the TSOT23-5 package?

The MIC5365-1.2YD5-T5 in TSOT23-5 has a junction-to-ambient thermal resistance (θJA) of 253°C/W. At 150mA load with 3.6V input and 1.2V output, power dissipation is ~360mW, resulting in ~91°C junction rise above ambient. With max TJ = 125°C, this allows ~34°C ambient operation at full load-adequate for handhelds with moderate airflow or thermal pads, but derating is advised above 60°C ambient.

Is MIC5365-1.2YD5-T5 pin-compatible with other variants in the MIC5365 family?

Yes, all MIC5365-YD5 variants-including MIC5365-1.2YD5-T5-share identical 5-pin TSOT23 pinout (VIN, GND, EN, NC, VOUT). Voltage variants differ only in internal feedback network; no external components change. This allows one PCB layout to support multiple output voltages via BOM revision, simplifying design reuse and inventory management across product families.