MIC5253-3.1BC5 Equivalent & Substitute Parts

Part Overview

The MIC5253-3.1BC5 is a linear voltage regulator IC from Microchip Technology's Teeny™ series, delivering a fixed 3.1V output at 100mA with SC-70-5 surface mount packaging. This device provides integrated protection features including over-current, over-temperature, and under-voltage lockout (UVLO) functionality, making it suitable for low-power applications requiring compact form factors.

The MIC5253-3.1BC5 is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.1V
Output Current	100mA
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	0.3V @ 100mA
Quiescent Current	100 µA
Package Type	SC-70-5 (5-TSSOP, SOT-353)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, UVLO

Substitute Part Grouping Explanation

Substitute parts for the MIC5253-3.1BC5 are identified based on strict electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Fixed output voltage of 3.1V
SC-70-5 package compatibility
Surface mount configuration
Output current capability ≥ 100mA
Input voltage rating ≥ 5.5V
Integrated protection features (Over Current, Over Temperature)

Substitute Categories:

Direct Equivalent (Same Manufacturer): MIC5253-3.1YC5-TR maintains identical electrical specifications and differs only in packaging format (Tape & Reel) and product status (Active vs. Obsolete). This part provides a direct replacement path within the Microchip product line.

Cross-Manufacturer Substitute: MAX8891EXK31+T from Analog Devices Inc./Maxim Integrated meets the core functional requirements with enhanced performance characteristics. While output current is rated at 150mA (exceeding the 100mA requirement), input voltage tolerance is 6V (exceeding 5.5V), and dropout voltage is lower at 0.12V @ 120mA, this device operates within compatible electrical parameters for the application space.

Parameter Comparison

Parameter	MIC5253-3.1BC5	MIC5253-3.1YC5-TR	MAX8891EXK31+T
Manufacturer	Microchip Technology	Microchip Technology	Analog Devices Inc./Maxim Integrated
Output Voltage (Fixed)	3.1V	3.1V	3.1V
Output Current	100mA	100mA	150mA
Input Voltage (Max)	5.5V	5.5V	6V
Voltage Dropout (Max)	0.3V @ 100mA	0.3V @ 100mA	0.12V @ 120mA (Typ)
Quiescent Current	100 µA	100 µA	40 µA
PSRR	70dB ~ 65dB (1kHz ~ 10kHz)	70dB ~ 65dB (1kHz ~ 10kHz)	65dB (10kHz)
Package Type	SC-70-5	SC-70-5	SC-70-5
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MIC5253-3.1YC5-TR is the preferred direct substitute. This part maintains complete electrical and thermal equivalence to the MIC5253-3.1BC5 while offering active product status and ROHS3 compliance. The transition from bulk packaging (BC5) to Tape & Reel format (YC5-TR) aligns with modern manufacturing practices and supply chain standards. No design modifications are required for implementation.

MAX8891EXK31+T serves as a cross-manufacturer alternative when MIC5253-3.1YC5-TR availability is constrained. This device provides superior performance in dropout voltage and quiescent current characteristics. However, the reduced operating temperature maximum of 85°C (versus 125°C) requires verification against application thermal requirements. The higher output current rating (150mA) and lower quiescent current (40 µA) may provide system-level benefits in power efficiency and thermal management. Both substitute parts maintain SC-70-5 package compatibility and integrated protection features.

Frequently Asked Questions (FAQ)

Q: Can MIC5253-3.1YC5-TR be used as a direct replacement for MIC5253-3.1BC5?

A: Yes. MIC5253-3.1YC5-TR is electrically and mechanically identical to MIC5253-3.1BC5. The difference is packaging format: BC5 denotes bulk packaging, while YC5-TR denotes Tape & Reel format. No circuit modifications are necessary.

Q: What are the key differences between MIC5253-3.1YC5-TR and MAX8891EXK31+T?

A: Both devices deliver 3.1V fixed output in SC-70-5 packages. MAX8891EXK31+T offers lower dropout voltage (0.12V vs. 0.3V), lower quiescent current (40 µA vs. 100 µA), and higher output current capability (150mA vs. 100mA). The MAX8891EXK31+T operating temperature range is -40°C to 85°C, compared to -40°C to 125°C for the MIC5253 series.

Q: Is the SC-70-5 package footprint identical across all three parts?

A: Yes. All three parts use the SC-70-5 package (5-TSSOP, SOT-353), ensuring PCB layout and assembly compatibility without modification.

Q: What compliance certifications apply to these substitute parts?

A: MIC5253-3.1YC5-TR and MAX8891EXK31+T are both ROHS3 compliant and REACH unaffected. The original MIC5253-3.1BC5 is RoHS non-compliant. All three parts carry EAR99 ECCN classification.

Q: Should I consider the MAX8891EXK31+T if my application operates at temperatures above 85°C?

A: No. If sustained operation above 85°C is required, MIC5253-3.1YC5-TR is the appropriate choice, as it maintains the full -40°C to 125°C operating range of the original part.

Q: Are there any protection feature differences between these parts?

A: MIC5253-3.1BC5 and MIC5253-3.1YC5-TR include identical protection: Over Current, Over Temperature, and Under Voltage Lockout (UVLO). MAX8891EXK31+T includes Over Current and Over Temperature protection but does not specify UVLO functionality in the provided specifications.

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