SY55855VKC Equivalent & Substitute Parts

Part Overview

The SY55855VKC is a mixed signal translator IC manufactured by Microchip Technology, designed for unidirectional signal translation between CML, PECL, and LVPECL input signals to LVDS output signals. Operating at 1.5Gbps data rate across 2 channels in a single circuit, this component is housed in a 10-MSOP surface mount package. The SY55855VKC is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs.

Key Parameters

Parameter	Value
Manufacturer Part Number	SY55855VKC
Manufacturer	Microchip Technology
Translator Type	Mixed Signal
Channel Type	Unidirectional
Number of Circuits	1
Channels per Circuit	2
Input Signal	CML, PECL, LVPECL
Output Signal	LVDS
Output Type	Differential
Data Rate	1.5Gbps
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
Product Status	Discontinued at DiGi Electronics
RoHS Status	RoHS non-compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SY55855VKC is determined by the following critical parameters: translator type (mixed signal), channel configuration (unidirectional, 2 channels per circuit), operating temperature range (-40°C ~ 85°C), and surface mount packaging. The primary substitute SY55855VKG maintains identical electrical specifications and packaging while offering improved RoHS3 compliance and active product status. Secondary substitutes from onsemi (MC100EPT23DG, MC100EPT23DTR2G) and NB4N855SMR4G provide functional equivalence but with package variations and differing input/output signal specifications. These alternatives are grouped based on their ability to perform the same unidirectional signal translation function within the specified operating parameters.

Parameter Comparison

Parameter	SY55855VKC	SY55855VKG	MC100EPT23DG	MC100EPT23DTR2G	NB4N855SMR4G
Manufacturer	Microchip Technology	Microchip Technology	onsemi	onsemi	onsemi
Translator Type	Mixed Signal	Mixed Signal	Mixed Signal	Mixed Signal	Receiver, Driver, Buffer, Translator
Channel Type	Unidirectional	Unidirectional	Unidirectional	Unidirectional	N/A
Channels per Circuit	2	2	2	2	2
Input Signal	CML, PECL, LVPECL	CML, PECL, LVPECL	CML, LVDS, LVPECL	CML, LVDS, LVPECL	N/A
Output Signal	LVDS	LVDS	LVTTL, LVCMOS	LVTTL, LVCMOS	N/A
Output Type	Differential	Differential	Non-Inverted	Non-Inverted	N/A
Data Rate	1.5Gbps	1.5Gbps	-	-	-
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	10-TFSOP, 10-MSOP	10-TFSOP, 10-MSOP	8-SOIC	8-TSSOP, 8-MSOP	10-TFSOP, 10-MSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Discontinued	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

SY55855VKG is the primary direct substitute for SY55855VKC, offering identical electrical specifications, packaging, and operating temperature range while providing active product status and ROHS3 compliance. This part maintains the same 10-MSOP package footprint and supports the same input signal types (CML, PECL, LVPECL) with LVDS differential output at 1.5Gbps.

MC100EPT23DG and MC100EPT23DTR2G from onsemi provide functional translation capability but with package variations (8-SOIC and 8-TSSOP respectively) and different output signal specifications (LVTTL, LVCMOS instead of LVDS). These parts are suitable only where output signal compatibility can be accommodated in the design.

NB4N855SMR4G maintains the 10-MSOP package and operating temperature range but is classified as a receiver, driver, buffer, and translator IC without specified input/output signal parameters, requiring detailed datasheet review for application compatibility.

All substitute parts maintain active product status and ROHS3 compliance, with the exception of the original SY55855VKC which is discontinued and RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q: Can SY55855VKG be used as a direct replacement for SY55855VKC?

A: Yes. SY55855VKG is a direct substitute with identical electrical specifications, channel configuration, data rate (1.5Gbps), operating temperature range (-40°C ~ 85°C), and 10-MSOP package. The primary differences are active product status and ROHS3 compliance.

Q: What are the key differences between SY55855VKG and the onsemi MC100EPT23 series?

A: SY55855VKG outputs LVDS differential signals, while MC100EPT23DG and MC100EPT23DTR2G output LVTTL and LVCMOS signals. Additionally, the onsemi parts use 8-pin packages (8-SOIC or 8-TSSOP) compared to the 10-pin MSOP package of the Microchip parts. These differences require circuit-level compatibility assessment.

Q: Are package differences between substitutes significant?

A: Yes. SY55855VKG maintains the 10-MSOP footprint of the original SY55855VKC, enabling direct PCB layout compatibility. MC100EPT23DG uses 8-SOIC and MC100EPT23DTR2G uses 8-TSSOP, requiring PCB redesign. NB4N855SMR4G maintains the 10-MSOP footprint but requires datasheet verification for functional compatibility.

Q: What is the MSL rating significance for these parts?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture control. MSL 3 (MC100EPT23DTR2G) requires moisture control for 168 hours after packaging opening. For applications with extended storage or humid environments, MSL 1 rated parts are preferred.

Q: Why is RoHS compliance important for this substitution?

A: The original SY55855VKC is RoHS non-compliant. All active substitutes (SY55855VKG, MC100EPT23DG, MC100EPT23DTR2G, NB4N855SMR4G) are ROHS3 compliant, meeting current regulatory requirements for electronic components in many markets.

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