MIC38HC44-1BM Equivalent & Substitute Parts

Part Overview

The MIC38HC44-1BM is an offline switching converter controller manufactured by Microchip Technology, designed for boost, buck, flyback, and forward topology applications. This isolated output PMIC operates at 500kHz switching frequency with integrated internal switches and frequency control features. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity.

Substiute Parts

MIC38HC44-1BM

Microchip TechnologyIn Stock: 1121MIC38HC44-1BM Datasheet

Current PartRFQ

UC3844AD

Texas InstrumentsIn Stock: 2049UC3844AD Datasheet

MFR RecommendedRFQ

UC3844ADTR

Texas InstrumentsIn Stock: 3000480UC3844ADTR Datasheet

MFR RecommendedRFQ

MIC38C44-1YM

Microchip TechnologyIn Stock: 1172MIC38C44-1YM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MIC38HC44-1BM are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalent: MIC38C44-1YM matches the MIC38HC44-1BM across all critical electrical parameters including topology (Boost, Buck, Flyback, Forward), supply voltage range (9V ~ 20V), switching frequency (500kHz), duty cycle (50%), output isolation (Isolated), internal switches (Yes), control features (Frequency Control), and package form factor (14-SOIC). This part maintains identical functional specifications while offering active product status and RoHS3 compliance.

Functional Equivalents: UC3844AD and UC3844ADTR are PWM controller ICs from Texas Instruments that operate within compatible supply voltage ranges (10V ~ 30V) and share the same 14-SOIC package footprint. These parts function as PWM controllers suitable for power supply applications, though they operate with different input voltage specifications (-0.3V ~ 6.3V) and narrower operating temperature range (0°C ~ 70°C TA) compared to the original part.

Key parameters determining substitution eligibility:

• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Supply Voltage Compatibility
• Switching Frequency and Topology Support
• Operating Temperature Range
• RoHS and Compliance Status

Parameter Comparison

Engineering Selection Recommendations

MIC38C44-1YM is the primary substitute for the MIC38HC44-1BM. This part maintains identical electrical specifications across all critical parameters including topology support, supply voltage range, switching frequency, duty cycle, output isolation, and operating temperature range. The MIC38C44-1YM carries active product status with ROHS3 compliance, addressing regulatory requirements that the original discontinued part does not meet. Inventory availability is confirmed at 1086 pieces.

UC3844AD and UC3844ADTR serve as functional alternatives for applications where PWM controller functionality is required within compatible supply voltage ranges. These Texas Instruments parts offer extended supply voltage capability (10V ~ 30V) and active product status with ROHS3 compliance. However, the narrower operating temperature range (0°C ~ 70°C TA versus -40°C ~ 150°C TJ) and different input voltage specifications (-0.3V ~ 6.3V) require circuit design verification for applications demanding the full temperature and voltage specifications of the original part. UC3844ADTR offers significantly higher inventory availability (3,000,400 pieces) in Cut Tape and Digi-Reel packaging.

Selection criteria:

• For direct parametric replacement: MIC38C44-1YM
• For applications with relaxed temperature requirements: UC3844AD or UC3844ADTR
• For high-volume procurement: UC3844ADTR

Frequently Asked Questions (FAQ)

Q: Can MIC38C44-1YM directly replace MIC38HC44-1BM without circuit modifications?

A: Yes. The MIC38C44-1YM maintains identical electrical specifications across topology, supply voltage range (9V ~ 20V), switching frequency (500kHz), duty cycle (50%), output isolation, internal switches, and control features. The 14-SOIC package footprint is identical. No circuit modifications are required for direct substitution.

Q: What are the key differences between MIC38C44-1YM and UC3844AD?

A: MIC38C44-1YM is a parametric equivalent with identical topology support (Boost, Buck, Flyback, Forward) and operating temperature range (-40°C ~ 150°C). UC3844AD is a PWM controller with extended supply voltage range (10V ~ 30V) but narrower operating temperature (0°C ~ 70°C) and different input voltage specifications (-0.3V ~ 6.3V). Selection depends on application temperature requirements and topology needs.

Q: Are all substitute parts available in the same packaging options?

A: MIC38C44-1YM is available in Tube packaging. UC3844AD is available in Tube packaging. UC3844ADTR is available in Cut Tape (CT) and Digi-Reel packaging. All three parts use the 14-SOIC (0.154", 3.90mm Width) package form factor suitable for surface mount assembly.

Q: Do the substitute parts meet RoHS compliance requirements?

A: Yes. MIC38C44-1YM, UC3844AD, and UC3844ADTR all carry ROHS3 compliance status. The original MIC38HC44-1BM is RoHS non-compliant. Substitution with any of these parts addresses RoHS regulatory requirements.

Q: What is the operating temperature limitation when using UC3844ADTR?

A: UC3844ADTR operates within 0°C ~ 70°C (TA) ambient temperature range, compared to the MIC38HC44-1BM specification of -40°C ~ 150°C (TJ) junction temperature. Applications requiring operation below 0°C or above 70°C ambient require MIC38C44-1YM or circuit design modifications for thermal management.

Q: Which substitute part offers the best inventory availability?

A: UC3844ADTR provides the highest inventory availability at 3,000,400 pieces in Cut Tape and Digi-Reel packaging. MIC38C44-1YM offers 1,086 pieces in Tube packaging. UC3844AD offers 2,030 pieces in Tube packaging.