MIC5253-1.8BC5 Equivalent & Substitute Parts

Part Overview

The MIC5253-1.8BC5 is a linear voltage regulator IC from Microchip Technology's Teeny™ series, delivering a fixed 1.8V output at 100mA in a compact SC-70-5 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides positive fixed output configuration with integrated protection features including over-current, over-temperature, and under-voltage lockout (UVLO) protection.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Part Number	MIC5253-1.8BC5
Output Voltage	1.8V Fixed
Output Current	100mA
Input Voltage (Max)	5.5V
Dropout Voltage	0.3V @ 100mA
Package	SC-70-5 (5-TSSOP)
Operating Temperature	-40°C to 125°C
Product Status	Obsolete
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Output voltage matching: 1.8V fixed output required
Package compatibility: SC-70-5 (5-TSSOP, SOT-353) form factor
Output current capability: Minimum 100mA to meet or exceed original specification
Input voltage range: Maximum 5.5V or higher
Protection features: Over-current and over-temperature protection mandatory
Operating temperature range: -40°C to 125°C or equivalent coverage

Substitute parts are grouped by output current capacity and product status (active vs. obsolete). Parts with higher current ratings remain compatible for applications requiring the original 100mA specification.

Parameter Comparison

Parameter	MIC5253-1.8BC5	MIC5253-1.8YC5-TR	RT9020-18GU5	RT9193-18GU5	TPS71718DCKR
Manufacturer	Microchip	Microchip	Richtek USA	Richtek USA	Texas Instruments
Output Voltage	1.8V	1.8V	1.8V	1.8V	1.8V
Output Current	100mA	100mA	500mA	300mA	150mA
Input Voltage (Max)	5.5V	5.5V	5.5V	5.5V	6.5V
Dropout Voltage	0.3V @ 100mA	0.3V @ 100mA	Not specified	Not specified	0.3V @ 150mA
Quiescent Current	100 µA	100 µA	50 µA	130 µA	80 µA
Package	SC-70-5	SC-70-5	SC-70-5	SC-70-5	SC-70-5
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 85°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Protection Features	OCP, OTP, UVLO	OCP, OTP, UVLO	OCP, OTP	OCP, OTP	OCP, OTP, Reverse Polarity, UVLO

Engineering Selection Recommendations

MIC5253-1.8YC5-TR is the direct equivalent from Microchip Technology, maintaining identical electrical specifications while offering active product status and ROHS3 compliance. This part is recommended as the primary replacement for the obsolete MIC5253-1.8BC5, with the only difference being packaging format (Tape & Reel vs. bulk).

TPS71718DCKR from Texas Instruments provides 150mA output current with extended input voltage tolerance (6.5V maximum) and additional reverse polarity protection. This part is suitable for applications requiring higher current headroom or enhanced input protection.

RT9193-18GU5 from Richtek USA offers 300mA output current while maintaining the full -40°C to 125°C operating temperature range. This part accommodates designs with higher current demands within the same thermal specifications.

RT9020-18GU5 from Richtek USA delivers 500mA output current but operates only to 85°C maximum, making it suitable for applications with higher current requirements in standard industrial temperature ranges.

All substitute parts maintain SC-70-5 package compatibility, 1.8V fixed output voltage, and required protection features. Selection should be based on output current requirements, operating temperature range, and compliance certifications needed for the target application.

Frequently Asked Questions (FAQ)

Q: Can MIC5253-1.8YC5-TR directly replace MIC5253-1.8BC5?

A: Yes. Both parts share identical electrical specifications: 1.8V output, 100mA current rating, 5.5V maximum input, 0.3V dropout voltage, and -40°C to 125°C operating range. The difference is packaging format (Tape & Reel vs. bulk). MIC5253-1.8YC5-TR is the active equivalent with ROHS3 compliance.

Q: What is the key difference between the substitute parts?

A: Output current capacity varies: MIC5253-1.8YC5-TR (100mA), TPS71718DCKR (150mA), RT9193-18GU5 (300mA), and RT9020-18GU5 (500mA). All maintain 1.8V output and SC-70-5 packaging. Higher-rated parts are backward-compatible with 100mA applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all active substitute parts (MIC5253-1.8YC5-TR, TPS71718DCKR, RT9193-18GU5, RT9020-18GU5) are ROHS3 compliant. The original MIC5253-1.8BC5 is non-compliant.

Q: Does operating temperature range affect substitution?

A: RT9020-18GU5 operates to 85°C maximum, while all other parts support -40°C to 125°C. For applications requiring full temperature range coverage, select MIC5253-1.8YC5-TR, TPS71718DCKR, or RT9193-18GU5.

Q: Can I use a higher-current-rated part in place of the 100mA original?

A: Yes. Parts rated for 150mA, 300mA, or 500mA are electrically compatible with 100mA applications. The regulator will supply only the current demanded by the load.

Q: What protection features are included in each substitute?

A: All parts include over-current and over-temperature protection. MIC5253-1.8BC5, MIC5253-1.8YC5-TR, and TPS71718DCKR additionally include under-voltage lockout (UVLO). TPS71718DCKR adds reverse polarity protection.

Q: Is the SC-70-5 package the same across all parts?

A: Yes. All parts use the SC-70-5 package (5-TSSOP, SOT-353), ensuring PCB footprint compatibility.

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