XR3177EID-F RS422/RS485 Half-Duplex Transceiver Equivalent & Substitute Parts

Part Overview

The XR3177EID-F is a half-duplex RS422/RS485 transceiver manufactured by MaxLinear, Inc., housed in an 8-SOIC surface mount package. This device operates at 3V to 3.6V supply voltage with a 20 Mbps data rate and supports industrial temperature ranges from -40°C to 85°C. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	XR3177EID-F
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS422, RS485
Duplex Mode	Half
Number of Drivers/Receivers	1/1
Receiver Hysteresis	25 mV
Data Rate	20 Mbps
Voltage Supply	3V – 3.6V
Operating Temperature	-40°C to 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the XR3177EID-F is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Protocol: RS422/RS485
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Voltage Supply Range: 3V – 3.6V
Operating Temperature Range: -40°C to 85°C
Receiver Hysteresis: 25 mV
Data Rate: 20 Mbps minimum

Functional Equivalence:

Number of Drivers/Receivers: 1/1
Duplex Mode: Half-duplex operation

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents (Half-Duplex) Parts that match all mandatory parameters and maintain half-duplex operation. These provide direct functional replacement with identical electrical and thermal specifications.

Category 2: Direct Manufacturers & MFR Recommended (Full-Duplex) Parts that share the same package, protocol, and core electrical specifications but operate in full-duplex mode. These parts accept the same pinout and package footprint but provide enhanced bidirectional capability. Full-duplex operation is backward compatible with half-duplex system designs when only unidirectional communication is required.

Parameter Comparison

Part Number	Manufacturer	Duplex	Data Rate	Voltage Supply	Operating Temp	Receiver Hysteresis	Product Status	Package
XR3177EID-F	MaxLinear, Inc.	Half	20 Mbps	3V – 3.6V	-40°C to 85°C	25 mV	Obsolete	8-SOIC
XR3078XID-F	MaxLinear, Inc.	Half	20 Mbps	3V – 3.6V	-40°C to 85°C	25 mV	Active	8-SOIC
LTC2851MPS8#TRPBF	Analog Devices Inc.	Full	20 Mbps	3V – 3.6V	-55°C to 125°C	25 mV	Active	8-SOIC
ADM488ARZ-REEL	Analog Devices Inc.	Full	250 kbps	4.5V – 5.5V	-40°C to 85°C	70 mV	Active	8-SOIC
ADM488ARZ-REEL7	Analog Devices Inc.	Full	250 kbps	4.5V – 5.5V	-40°C to 85°C	70 mV	Active	8-SOIC
ISL3177EIBZ	Renesas Electronics Corporation	Full	20 Mbps	3V – 3.6V	-40°C to 85°C	15 mV	Active	8-SOIC
LTC1686CS8#PBF	Analog Devices Inc.	Full	52 Mbps	4.75V – 5.25V	0°C to 70°C	25 mV	Active	8-SOIC
LTC1686CS8#TRPBF	Analog Devices Inc.	Full	52 Mbps	4.75V – 5.25V	0°C to 70°C	25 mV	Active	8-SOIC
LTC1686IS8#PBF	Analog Devices Inc.	Full	52 Mbps	4.75V – 5.25V	-40°C to 85°C	25 mV	Active	8-SOIC
LTC1686IS8#TRPBF	Analog Devices Inc.	Full	52 Mbps	4.75V – 5.25V	-40°C to 85°C	25 mV	Active	8-SOIC
SN65HVD31D	Texas Instruments	Full	5 Mbps	3V – 3.6V	-40°C to 85°C	50 mV	Obsolete	8-SOIC

Engineering Selection Recommendations

Primary Recommendation: XR3078XID-F

The XR3078XID-F from MaxLinear, Inc. is the optimal direct replacement for the XR3177EID-F. This part maintains identical electrical specifications, duplex mode, data rate, voltage supply range, operating temperature, and receiver hysteresis. The XR3078XID-F is currently in active production status, ensuring long-term availability and supply chain stability. Both parts share the same 8-SOIC package footprint and surface mount characteristics, enabling direct PCB substitution without design modification.

Secondary Recommendation: ISL3177EIBZ

The ISL3177EIBZ from Renesas Electronics Corporation provides full-duplex RS422/RS485 operation in the same 8-SOIC package with matching voltage supply (3V – 3.6V) and operating temperature range (-40°C to 85°C). This part supports the full 20 Mbps data rate and is in active production. The receiver hysteresis of 15 mV is lower than the original specification, providing improved noise margin. Full-duplex capability allows bidirectional simultaneous communication when system architecture permits.

Alternative Recommendation: LTC1686IS8#TRPBF

The LTC1686IS8#TRPBF from Analog Devices Inc. offers full-duplex RS422/RS485 operation with extended data rate capability (52 Mbps) and matching operating temperature range (-40°C to 85°C). This part requires 4.75V – 5.25V supply voltage, necessitating power supply adjustment in 3.3V systems. The part is in active production with ROHS3 compliance and unlimited moisture sensitivity rating.

Not Recommended: ADM488ARZ Series

The ADM488ARZ-REEL and ADM488ARZ-REEL7 parts operate at reduced data rate (250 kbps) and require 4.5V – 5.5V supply voltage, making them unsuitable for 3.3V low-power applications. These parts are appropriate only for legacy 5V systems with lower bandwidth requirements.

Not Recommended: SN65HVD31D

The SN65HVD31D from Texas Instruments is classified as obsolete and offers only 5 Mbps data rate with 50 mV receiver hysteresis, both below the original specification. This part should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can the XR3078XID-F directly replace the XR3177EID-F without PCB modification?

A: Yes. The XR3078XID-F shares identical package dimensions (8-SOIC, 0.154" width), pinout, voltage supply range (3V – 3.6V), operating temperature (-40°C to 85°C), and all electrical specifications. Direct PCB substitution is possible without design changes.

Q: What is the difference between half-duplex and full-duplex operation in these transceivers?

A: Half-duplex transceivers (XR3177EID-F, XR3078XID-F) support unidirectional communication on a shared bus at any given time. Full-duplex transceivers (LTC2851MPS8#TRPBF, ISL3177EIBZ, LTC1686 series) support simultaneous bidirectional communication. Full-duplex parts are backward compatible with half-duplex system designs when only unidirectional communication is required.

Q: Why do some substitute parts require different supply voltages?

A: Different manufacturers design transceivers for specific voltage domains. The LTC1686 series operates at 4.75V – 5.25V for legacy 5V systems, while the ISL3177EIBZ and LTC2851MPS8#TRPBF maintain the 3V – 3.6V range for low-power applications. System power supply architecture determines which parts are electrically compatible.

Q: Is the ISL3177EIBZ suitable for applications requiring exactly 25 mV receiver hysteresis?

A: The ISL3177EIBZ provides 15 mV receiver hysteresis, which is lower than the original 25 mV specification. Lower hysteresis improves noise immunity in clean signal environments but may increase susceptibility to noise in electrically noisy environments. System noise analysis is required to determine suitability.

Q: Can I use LTC1686IS8#TRPBF in a 3.3V system?

A: No. The LTC1686IS8#TRPBF requires 4.75V – 5.25V supply voltage and is not compatible with 3.3V systems. Use ISL3177EIBZ or LTC2851MPS8#TRPBF for 3.3V applications.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active parts are in current production with guaranteed long-term availability and supply chain support. Obsolete parts are no longer manufactured and have limited remaining inventory. For new designs and long-term system support, active parts are required.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, meeting current environmental and hazardous substance restrictions.

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