ISL3174EIBZ Equivalent & Substitute Parts

Part Overview

The ISL3174EIBZ is a 1/1 full-duplex RS422/RS485 transceiver manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This component operates at 3V to 3.6V supply voltage with a 500kbps data rate and -40°C to 85°C temperature range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	ISL3174EIBZ
Manufacturer	Renesas Electronics Corporation
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	15 mV
Data Rate	500kbps
Voltage - Supply	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the ISL3174EIBZ is determined by the following critical parameters:

Protocol compatibility: RS422/RS485 full-duplex transceiver
Driver/Receiver configuration: 1/1 topology
Package type: 8-SOIC surface mount
Supply voltage range: 3V to 3.6V
Operating temperature range: -40°C to 85°C minimum
Receiver hysteresis: 15 mV or higher acceptable
Data rate: 500kbps or higher acceptable

Substitute parts are grouped into two categories based on data rate capability:

Category A - 500kbps Data Rate (Direct Functional Equivalents): Parts maintaining the original 500kbps specification with identical receiver hysteresis of 15 mV.

Category B - 20Mbps Data Rate (Enhanced Performance Substitutes): Parts with higher data rate capability (20Mbps) that maintain all other critical parameters. These provide superior performance headroom while remaining pin-compatible and functionally compatible at the ISL3174EIBZ operating frequency.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Package	Product Status	MSL
ISL3174EIBZ	Renesas	RS422/RS485	1/1	500kbps	3V ~ 3.6V	-40°C ~ 85°C	15 mV	8-SOIC	Obsolete	1
ISL3177EIBZ	Renesas	RS422/RS485	1/1	20Mbps	3V ~ 3.6V	-40°C ~ 85°C	15 mV	8-SOIC	Active	3
LTC2851CS8#PBF	Analog Devices	RS422/RS485	1/1	20Mbps	3V ~ 3.6V	0°C ~ 70°C	25 mV	8-SOIC	Active	1
LTC2851CS8#TRPBF	Analog Devices	RS422/RS485	1/1	20Mbps	3V ~ 3.6V	0°C ~ 70°C	25 mV	8-SOIC	Active	1
LTC2851HS8#PBF	Analog Devices	RS422/RS485	1/1	20Mbps	3V ~ 3.6V	-40°C ~ 125°C	25 mV	8-SOIC	Active	1
LTC2851HS8#TRPBF	Analog Devices	RS422/RS485	1/1	20Mbps	3V ~ 3.6V	-40°C ~ 125°C	25 mV	8-SOIC	Active	1
LTC2851IS8#PBF	Analog Devices	RS422/RS485	1/1	20Mbps	3V ~ 3.6V	-40°C ~ 85°C	25 mV	8-SOIC	Active	1
LTC2851IS8#TRPBF	Analog Devices	RS422/RS485	1/1	20Mbps	3V ~ 3.6V	-40°C ~ 85°C	25 mV	8-SOIC	Active	1
LTC2851MPS8#PBF	Analog Devices	RS422/RS485	1/1	20Mbps	3V ~ 3.6V	-55°C ~ 125°C	25 mV	8-SOIC	Active	1
SP3074EEN-L/TR	MaxLinear	RS422/RS485	1/1	500kbps	3.3V	-40°C ~ 85°C	15 mV	8-SOIC	Active	1

Engineering Selection Recommendations

For Direct Replacement (Obsolete Part Mitigation):

ISL3177EIBZ is the primary substitute from Renesas Electronics Corporation. It maintains identical receiver hysteresis (15 mV), package configuration, and temperature range as the ISL3174EIBZ while offering 20Mbps data rate capability. Product status is active with ROHS3 compliance. MSL rating of 3 (168 hours) requires standard moisture control during storage and assembly.

SP3074EEN-L/TR from MaxLinear, Inc. provides an alternative with matching 500kbps data rate and 15 mV receiver hysteresis. This part operates at 3.3V (within the 3V-3.6V range) and maintains the -40°C to 85°C temperature specification. Product status is active with RoHS compliance and MSL 1 rating.

For Extended Temperature Applications:

LTC2851HS8#PBF and LTC2851HS8#TRPBF from Analog Devices extend the upper operating temperature to 125°C while maintaining the lower -40°C limit. These parts support 20Mbps data rate with 25 mV receiver hysteresis. Both are ROHS3 compliant with MSL 1 rating. The #TRPBF variant uses tape and reel packaging.

LTC2851MPS8#PBF extends the temperature range to -55°C to 125°C, providing the widest operating envelope among all substitutes. This part is suitable for extreme environment applications while maintaining 3V-3.6V supply compatibility and 20Mbps data rate.

For Standard Industrial Temperature Range:

LTC2851IS8#PBF and LTC2851IS8#TRPBF maintain the -40°C to 85°C specification matching the original part. Both support 20Mbps data rate and are ROHS3 compliant with MSL 1 rating. The #TRPBF variant provides tape and reel packaging for automated assembly.

For Restricted Temperature Applications (0°C to 70°C):

LTC2851CS8#PBF and LTC2851CS8#TRPBF operate within a narrower temperature window (0°C to 70°C). These parts are suitable only for applications that do not require the full -40°C lower limit. Both support 20Mbps data rate and are ROHS3 compliant with MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can I use LTC2851 series parts as direct replacements for ISL3174EIBZ?

A: Yes. All LTC2851 variants maintain the critical parameters: RS422/RS485 protocol, 1/1 driver/receiver configuration, 3V-3.6V supply voltage, 8-SOIC package, and ROHS3 compliance. The higher 20Mbps data rate is backward compatible with 500kbps applications. Operating temperature range must be verified for your specific application.

Q: What is the difference between receiver hysteresis values of 15 mV and 25 mV?

A: Receiver hysteresis determines the voltage difference between the rising and falling threshold levels. The 15 mV specification of ISL3174EIBZ and ISL3177EIBZ provides tighter threshold control. The 25 mV hysteresis of LTC2851 series parts is acceptable for RS422/RS485 applications and does not affect protocol compliance.

Q: Why does SP3074EEN-L/TR specify 3.3V instead of a 3V-3.6V range?

A: SP3074EEN-L/TR operates at 3.3V nominal supply voltage, which falls within the 3V-3.6V acceptable range for the ISL3174EIBZ. This part is suitable for 3.3V logic systems. Verify your power supply specification before selection.

Q: What is the significance of MSL ratings (1 vs. 3)?

A: MSL 1 (Unlimited) indicates the component can be stored indefinitely without moisture absorption concerns. MSL 3 (168 hours) requires that the component be used within 168 hours of package opening in standard humidity conditions. ISL3177EIBZ with MSL 3 requires standard moisture control procedures during assembly.

Q: Are tape and reel (#TRPBF) and tube (#PBF) variants functionally identical?

A: Yes. Tape and reel and tube packaging variants of the same part number (e.g., LTC2851HS8#PBF vs. LTC2851HS8#TRPBF) are functionally identical. The difference is packaging format for automated assembly (tape and reel) versus manual handling (tube). Select based on your assembly process requirements.

Q: Which substitute offers the widest operating temperature range?

A: LTC2851MPS8#PBF provides -55°C to 125°C operation, the widest range among all substitutes. This part is suitable for extreme environment applications requiring extended temperature performance beyond the original ISL3174EIBZ specification.

Q: Can I use a 20Mbps rated part in a 500kbps application?

A: Yes. Higher data rate capability is backward compatible. A 20Mbps transceiver operates correctly at 500kbps. The higher rating provides performance margin and future upgrade flexibility without affecting current system operation.

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