MIC2172BN Equivalent & Substitute Parts

Part Overview

The MIC2172BN is a switching regulator IC from Microchip Technology designed for multiple converter topologies including Boost, Cuk, Flyback, and Forward Converter configurations. It supports positive or negative output with isolation capability and delivers adjustable output voltage from 1.24V to 65V at 1.25A switch current. The device operates across a wide input voltage range of 3V to 40V with a 100kHz switching frequency.

The MIC2172BN is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support long-term product availability for applications currently using this component.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Function	Step-Up, Step-Up/Step-Down
Topology	Boost, Cuk, Flyback, Forward Converter
Output Configuration	Positive or Negative, Isolation Capable
Output Type	Adjustable
Number of Outputs	1
Voltage - Input (Min)	3V
Voltage - Input (Max)	40V
Voltage - Output (Min/Fixed)	1.24V
Voltage - Output (Max)	65V (Switch)
Current - Output	1.25A (Switch)
Frequency - Switching	100kHz
Synchronous Rectifier	No
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
Supplier Device Package	8-PDIP
Base Product Number	MIC2172

Substitute Part Grouping Explanation

Substitution of the MIC2172BN is determined by strict equivalence across the following critical parameters:

Manufacturer & Base Product Number: Both main and substitute parts must originate from Microchip Technology and share the base product number MIC2172
Functional Topology: Identical support for Boost, Cuk, Flyback, and Forward Converter topologies
Output Configuration: Both must support positive or negative output with isolation capability
Electrical Specifications: Input voltage range (3V–40V), adjustable output voltage (1.24V–65V), output current (1.25A switch), and switching frequency (100kHz) must match exactly
Package & Mounting: Both must use 8-DIP (0.300", 7.62mm) through-hole packaging
Operating Temperature Range: Both must support -40°C to 85°C operating temperature

The MIC2172YN meets all substitution criteria as a direct equivalent part from the same manufacturer and product family.

Parameter Comparison

Parameter	MIC2172BN	MIC2172YN
Manufacturer	Microchip Technology	Microchip Technology
Category	Power Management (PMIC)	Power Management (PMIC)
Function	Step-Up, Step-Up/Step-Down	Step-Up, Step-Up/Step-Down
Topology	Boost, Cuk, Flyback, Forward Converter	Boost, Cuk, Flyback, Forward Converter
Output Configuration	Positive or Negative, Isolation Capable	Positive or Negative, Isolation Capable
Output Type	Adjustable	Adjustable
Number of Outputs	1	1
Voltage - Input (Min)	3V	3V
Voltage - Input (Max)	40V	40V
Voltage - Output (Min/Fixed)	1.24V	1.24V
Voltage - Output (Max)	65V (Switch)	65V (Switch)
Current - Output	1.25A (Switch)	1.25A (Switch)
Frequency - Switching	100kHz	100kHz
Synchronous Rectifier	No	No
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Through Hole	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Supplier Device Package	8-PDIP	8-PDIP
Base Product Number	MIC2172	MIC2172
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The MIC2172YN is a direct functional equivalent to the MIC2172BN with identical electrical and mechanical specifications. The primary distinction is product lifecycle status and regulatory compliance.

The MIC2172BN is obsolete and RoHS non-compliant. The MIC2172YN is an active product with ROHS3 compliance, making it the appropriate selection for new designs and applications requiring regulatory adherence. Both parts share the same base product number (MIC2172), identical electrical performance across all specified parameters, and compatible 8-DIP through-hole packaging.

For applications currently using the MIC2172BN, the MIC2172YN provides direct substitution without circuit modification or re-qualification, provided that RoHS3 compliance is acceptable for the end application.

Frequently Asked Questions (FAQ)

Q: Can the MIC2172YN directly replace the MIC2172BN in existing designs?

A: Yes. The MIC2172YN is electrically and mechanically identical to the MIC2172BN across all specified parameters including input/output voltage ranges, output current, switching frequency, operating temperature, and 8-DIP package configuration. No circuit changes are required.

Q: What is the difference between the MIC2172BN and MIC2172YN?

A: The MIC2172BN is obsolete and RoHS non-compliant. The MIC2172YN is an active product with ROHS3 compliance. All electrical and mechanical specifications are identical.

Q: Are there any packaging differences between these parts?

A: Both parts use 8-DIP (0.300", 7.62mm) through-hole packaging. The MIC2172BN is supplied without specified packaging, while the MIC2172YN is supplied in Tube packaging. Both are compatible with standard through-hole PCB assembly processes.

Q: What topologies are supported by these switching regulator ICs?

A: Both the MIC2172BN and MIC2172YN support Boost, Cuk, Flyback, and Forward Converter topologies with positive or negative output configuration and isolation capability.

Q: What is the input voltage operating range?

A: Both parts operate with input voltage from 3V minimum to 40V maximum, with adjustable output voltage from 1.24V to 65V at 1.25A switch current.

Q: Is RoHS compliance a factor in selecting between these parts?

A: RoHS compliance is relevant only if your application or end market requires it. The MIC2172YN is ROHS3 compliant, while the MIC2172BN is not. For applications without RoHS requirements, both parts are functionally equivalent.

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