MIC2171BU TR Equivalent & Substitute Parts

Part Overview

The MIC2171BU TR is a multi-configuration adjustable switching regulator IC from Microchip Technology, designed for buck, boost, Cuk, flyback, and forward converter topologies. It supports positive or negative output configurations with isolation capability and delivers 2.5A switch current. The device is packaged in TO-263-6 (D2PAK with 5 leads plus tab) and operates across -40°C to 85°C.

The MIC2171BU TR is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with active manufacturing status and current compliance certifications.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Function	Step-Up, Step-Down, Step-Up/Step-Down
Topology	Buck, Boost, Cuk, Flyback, Forward Converter
Output Configuration	Positive or Negative, Isolation Capable
Number of Outputs	1
Output Type	Adjustable
Voltage - Input (Min)	3V
Voltage - Input (Max)	40V
Voltage - Output (Max)	65V (Switch)
Current - Output	2.5A (Switch)
Frequency - Switching	100kHz
Synchronous Rectifier	No
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Supplier Device Package	TO-263-5
Base Product Number	MIC2171
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the MIC2171BU TR is determined by strict equivalence across the following critical parameters:

Base product number (MIC2171 series)
Functional topology (Buck, Boost, Cuk, Flyback, Forward Converter)
Output configuration (Positive or Negative, Isolation Capable)
Electrical specifications (Input voltage 3V–40V, output voltage to 65V, 2.5A switch current)
Switching frequency (100kHz)
Package type (TO-263-6, D2PAK)
Operating temperature range (-40°C ~ 85°C)

The MIC2171WU-TR qualifies as a direct substitute because it maintains identical electrical and mechanical specifications while differing only in packaging format (Cut Tape & Digi-Reel versus Tape & Reel) and product status (Active versus Obsolete).

Parameter Comparison

Parameter	MIC2171BU TR	MIC2171WU-TR
Manufacturer	Microchip Technology	Microchip Technology
Base Product Number	MIC2171	MIC2171
Function	Step-Up, Step-Down, Step-Up/Step-Down	Step-Up, Step-Down, Step-Up/Step-Down
Topology	Buck, Boost, Cuk, Flyback, Forward Converter	Buck, Boost, Cuk, Flyback, Forward Converter
Output Configuration	Positive or Negative, Isolation Capable	Positive or Negative, Isolation Capable
Number of Outputs	1	1
Output Type	Adjustable	Adjustable
Voltage - Input (Min)	3V	3V
Voltage - Input (Max)	40V	40V
Voltage - Output (Max)	65V (Switch)	65V (Switch)
Current - Output	2.5A (Switch)	2.5A (Switch)
Frequency - Switching	100kHz	100kHz
Synchronous Rectifier	No	No
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	TO-263-6, D2PAK (5 Leads + Tab), TO-263BA	TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Supplier Device Package	TO-263-5	TO-263-5
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The MIC2171WU-TR is the direct substitute for the MIC2171BU TR. Both parts share identical electrical and mechanical specifications, ensuring functional compatibility in all switching regulator topologies and output configurations.

The MIC2171WU-TR offers two significant advantages:

Active product status ensures ongoing availability and manufacturing support from Microchip Technology
ROHS3 compliance meets current environmental and regulatory requirements, whereas the MIC2171BU TR is RoHS non-compliant

Pin-to-pin compatibility and identical package geometry (TO-263-6, D2PAK) enable direct substitution without circuit redesign. The packaging format difference (Cut Tape & Digi-Reel versus Tape & Reel) affects only procurement and handling procedures, not electrical or mechanical performance.

Frequently Asked Questions (FAQ)

Q: Are the MIC2171BU TR and MIC2171WU-TR pin-compatible?

A: Yes. Both parts use the TO-263-6 (D2PAK) package with identical pinout and lead configuration. Direct substitution is possible without circuit modification.

Q: What is the difference between Tape & Reel (TR) and Cut Tape & Digi-Reel packaging?

A: Tape & Reel (TR) and Cut Tape & Digi-Reel are packaging and delivery formats that do not affect component electrical or mechanical performance. The choice depends on procurement volume and assembly line requirements.

Q: Why is the MIC2171BU TR classified as obsolete?

A: Obsolete status indicates that Microchip Technology has discontinued active manufacturing and support for this specific part number variant. The MIC2171WU-TR remains in active production.

Q: Does the RoHS compliance difference affect electrical performance?

A: No. RoHS compliance is a material composition and environmental standard. It does not alter electrical specifications, switching characteristics, or output performance. The MIC2171WU-TR meets ROHS3 requirements, making it suitable for applications with environmental compliance mandates.

Q: Can I use the MIC2171WU-TR in existing designs specified for the MIC2171BU TR?

A: Yes. Identical electrical specifications, switching frequency, output current rating, and package geometry ensure functional equivalence. No design changes are required.

Q: What is the Moisture Sensitivity Level (MSL) rating?

A: Both parts carry MSL 3 (168 Hours), indicating they require controlled storage conditions and have a 168-hour floor life after moisture exposure. Standard handling procedures for MSL 3 components apply.

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