MIC2551YML-TR Equivalent & Substitute Parts

Part Overview

The MIC2551YML-TR is a 1/1 transceiver half USB 2.0 interface IC manufactured by Microchip Technology in a 16-MLF® (4x4) surface mount package. This part operates at 12 Mbps data rate with a supply voltage range of 4V to 5.25V and is rated for -40°C to 85°C operating temperature. The MIC2551YML-TR is currently classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this USB 2.0 transceiver interface.

Key Parameters

Parameter	Value
Manufacturer Part Number	MIC2551YML-TR
Manufacturer	Microchip Technology
Category	Interface
Type	Transceiver
Protocol	USB 2.0
Number of Drivers/Receivers	1/1
Duplex	Half
Data Rate	12 Mbps
Receiver Hysteresis	200 mV
Voltage - Supply	4V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package / Case	16-VQFN Exposed Pad, 16-MLF®
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the MIC2551YML-TR are identified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Substitution Criteria:

Protocol: USB 2.0
Number of Drivers/Receivers: 1/1
Duplex: Half
Data Rate: 12 Mbps
Receiver Hysteresis: 200 mV
Voltage - Supply: 4V ~ 5.25V
Operating Temperature: -40°C ~ 85°C
Package / Case: 16-VQFN Exposed Pad, 16-MLF® (4x4)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Substitute Categories:

Parametric Equivalents (identical electrical and mechanical specifications):

MIC2550YML-TR
MIC2550AYML-TR
MIC2551AYML-TR

These parts maintain all critical parameters including protocol, data rate, voltage supply range, operating temperature, package type, and compliance certifications. Differences exist only in product status and moisture sensitivity level (MSL) ratings.

Functional Alternative (different architecture, different interface):

MCP2221AT-I/ML

This part operates as a USB bridge with I2C/UART interface rather than a direct USB 2.0 transceiver. It is included in the substitute list but serves a different functional role and requires circuit redesign for implementation.

Parameter Comparison

Parameter	MIC2551YML-TR	MIC2550YML-TR	MIC2550AYML-TR	MIC2551AYML-TR	MCP2221AT-I/ML
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology
Type	Transceiver	Transceiver	Transceiver	Transceiver	Bridge
Protocol	USB 2.0	USB 2.0	USB 2.0	USB 2.0	USB 2.0
Number of Drivers/Receivers	1/1	1/1	1/1	1/1	N/A
Duplex	Half	Half	Half	Half	N/A
Data Rate	12 Mbps	12 Mbps	12 Mbps	12 Mbps	N/A
Receiver Hysteresis	200 mV	200 mV	200 mV	200 mV	N/A
Voltage - Supply	4V ~ 5.25V	4V ~ 5.25V	4V ~ 5.25V	4V ~ 5.25V	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-VQFN Exposed Pad, 16-MLF®	16-VQFN Exposed Pad, 16-MLF®	16-VQFN Exposed Pad, 16-MLF®	16-VQFN Exposed Pad, 16-MLF®	16-VQFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	2 (1 Year)	3 (168 Hours)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Obsolete	Active

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement:

MIC2550YML-TR and MIC2550AYML-TR are the primary recommended substitutes for MIC2551YML-TR. Both parts maintain identical electrical specifications (protocol, data rate, voltage supply, operating temperature, receiver hysteresis) and mechanical compatibility (16-MLF® package, surface mount). Both are currently in active product status, ensuring long-term supply availability. MIC2550AYML-TR offers improved moisture sensitivity level (MSL 2, 1 Year) compared to the original part (MSL 3, 168 Hours), providing enhanced reliability in humid storage and operational environments.

MIC2551AYML-TR provides parametric equivalence but is classified as obsolete, limiting its suitability for new designs despite current inventory availability.

For Alternative Architecture Applications:

MCP2221AT-I/ML is a functional alternative that implements USB 2.0 connectivity through a bridge architecture with I2C and UART interfaces. This part is suitable only for applications where the USB-to-I2C/UART bridge functionality aligns with system requirements. It requires circuit redesign and is not a direct pin replacement. The MCP2221AT-I/ML offers superior moisture sensitivity (MSL 1, Unlimited) and extended supply voltage range (3V ~ 5.5V).

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the original MIC2551YML-TR.

Frequently Asked Questions (FAQ)

Q: Can MIC2550YML-TR be used as a direct replacement for MIC2551YML-TR?

A: Yes. MIC2550YML-TR is a parametric equivalent with identical electrical specifications (USB 2.0 protocol, 1/1 transceiver half configuration, 12 Mbps data rate, 200 mV receiver hysteresis, 4V ~ 5.25V supply voltage, -40°C ~ 85°C operating temperature) and mechanical compatibility (16-MLF® package, surface mount). The part is currently in active product status, ensuring supply availability.

Q: What is the difference between MIC2550YML-TR and MIC2550AYML-TR?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The primary difference is moisture sensitivity level (MSL): MIC2550YML-TR is rated MSL 3 (168 Hours), while MIC2550AYML-TR is rated MSL 2 (1 Year). MIC2550AYML-TR provides enhanced reliability in humid environments and longer shelf life without baking requirements.

Q: Why is MIC2551AYML-TR listed as a substitute if it is obsolete?

A: MIC2551AYML-TR is a parametric equivalent with identical electrical and mechanical specifications to MIC2551YML-TR. It is included in the substitute list based on the provided data but is not recommended for new designs due to its obsolete status. Current inventory exists, but long-term supply cannot be assured.

Q: Can MCP2221AT-I/ML replace MIC2551YML-TR in my application?

A: MCP2221AT-I/ML is a functional alternative, not a direct replacement. It implements USB 2.0 connectivity through a bridge architecture with I2C and UART interfaces, whereas MIC2551YML-TR is a direct USB 2.0 transceiver. MCP2221AT-I/ML requires circuit redesign and is suitable only for applications where USB-to-I2C/UART bridge functionality is required.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts (MIC2550YML-TR, MIC2550AYML-TR, MIC2551AYML-TR, and MCP2221AT-I/ML) are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to MIC2551YML-TR.

Q: What is the package compatibility between MIC2551YML-TR and its substitutes?

A: MIC2551YML-TR, MIC2550YML-TR, MIC2550AYML-TR, and MIC2551AYML-TR all use the 16-VQFN Exposed Pad, 16-MLF® (4x4) package with surface mount mounting type, ensuring pin-for-pin and footprint compatibility. MCP2221AT-I/ML uses a 16-VQFN Exposed Pad package with the same pin count and footprint but different pinout and functionality.

Q: What is the supply voltage range for each substitute part?

A: MIC2551YML-TR, MIC2550YML-TR, MIC2550AYML-TR, and MIC2551AYML-TR all operate at 4V ~ 5.25V supply voltage. MCP2221AT-I/ML operates at a wider range of 3V ~ 5.5V, providing greater flexibility in power supply design.

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