MIC2551AYTS-TR Equivalent & Substitute Parts

Part Overview

The MIC2551AYTS-TR is a half-duplex USB 2.0 transceiver interface IC manufactured by Microchip Technology, housed in a 14-TSSOP surface mount package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across a 4V to 5.25V supply range with a 12 Mbps data rate and 200 mV receiver hysteresis, designed for half-duplex transceiver applications requiring single driver/receiver configuration.

Key Parameters

Parameter	Value
Manufacturer Part Number	MIC2551AYTS-TR
Manufacturer	Microchip Technology
Category	Interface
Product Status	Obsolete
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	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MIC2551AYTS-TR is determined by the following critical parameters: USB 2.0 protocol compliance, half-duplex transceiver configuration with 1/1 driver/receiver count, 12 Mbps data rate capability, 200 mV receiver hysteresis, 4V to 5.25V supply voltage range, 14-TSSOP package format, and surface mount mounting type.

Two categories of substitutes are identified:

Parametric Equivalents: MIC2550AYTS-TR and MIC2550YTS-TR maintain identical electrical specifications and mechanical packaging, differing only in product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. Cut Tape). These parts are direct functional replacements.

Functional Alternative: MCP2221AT-I/ST operates under USB 2.0 protocol with identical 14-TSSOP packaging and supply voltage range (3V ~ 5.5V), but functions as a USB bridge to I2C/UART rather than a half-duplex transceiver. This part addresses applications requiring USB interface functionality with different protocol endpoints.

Parameter Comparison

Parameter	MIC2551AYTS-TR	MIC2550AYTS-TR	MIC2550YTS-TR	MCP2221AT-I/ST
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology
Product Status	Obsolete	Active	Active	Active
Protocol	USB 2.0	USB 2.0	USB 2.0	USB 2.0
Type	Transceiver	Transceiver	Transceiver	Bridge
Number of Drivers/Receivers	1/1	1/1	1/1	N/A
Duplex	Half	Half	Half	N/A
Data Rate	12 Mbps	12 Mbps	12 Mbps	N/A
Receiver Hysteresis	200 mV	200 mV	200 mV	N/A
Voltage - Supply	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
Package / Case	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement: MIC2550AYTS-TR and MIC2550YTS-TR are recommended as primary substitutes. Both parts maintain active product status with Microchip Technology, ensuring long-term availability and support. Electrical and mechanical specifications are identical to the MIC2551AYTS-TR. Selection between these two depends on packaging requirements: MIC2550AYTS-TR is supplied in Tape & Reel format suitable for automated assembly, while MIC2550YTS-TR is also available in Tape & Reel format. Both comply with ROHS3 and maintain MSL 1 classification.

For Functional Alternative: MCP2221AT-I/ST serves applications where USB-to-I2C/UART bridge functionality is required rather than direct half-duplex transceiver operation. This part shares identical 14-TSSOP packaging, USB 2.0 protocol compliance, and operating temperature range. The expanded supply voltage range (3V ~ 5.5V) provides additional design flexibility. Selection of this alternative requires functional redesign of the interface layer.

Frequently Asked Questions (FAQ)

Q: Can MIC2550AYTS-TR and MIC2550YTS-TR be used interchangeably with MIC2551AYTS-TR?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, including 12 Mbps data rate, 200 mV receiver hysteresis, 1/1 half-duplex transceiver configuration, and 4V to 5.25V supply voltage. The primary difference is product status (Active vs. Obsolete) and packaging format. Pin configuration and functional behavior are identical.

Q: What is the key difference between the MIC2550 variants?

A: MIC2550AYTS-TR and MIC2550YTS-TR differ in packaging designation only. Both are supplied in Tape & Reel format by Microchip Technology and maintain identical electrical and mechanical specifications. Selection depends on procurement and assembly process requirements.

Q: Is MCP2221AT-I/ST a direct replacement for MIC2551AYTS-TR?

A: No. While MCP2221AT-I/ST shares the 14-TSSOP package, USB 2.0 protocol, and operating temperature range, it functions as a USB bridge to I2C/UART rather than a half-duplex transceiver. This part is suitable only for applications requiring USB-to-I2C/UART interface conversion. Functional redesign is required for integration.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. MIC2550AYTS-TR, MIC2550YTS-TR, and MCP2221AT-I/ST are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity classification, matching the compliance profile of the MIC2551AYTS-TR.

Q: What supply voltage range should be considered when selecting a substitute?

A: MIC2550AYTS-TR and MIC2550YTS-TR operate within 4V to 5.25V, identical to the MIC2551AYTS-TR. MCP2221AT-I/ST supports a wider range of 3V to 5.5V, allowing operation at lower supply voltages if required by the application.

Q: Are there inventory considerations for substitute selection?

A: MIC2550AYTS-TR (3860 Pcs) and MCP2221AT-I/ST (5300 Pcs) maintain higher inventory levels than MIC2550YTS-TR (1053 Pcs), supporting production continuity and lead time requirements.

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