ISL8485ECP Equivalent & Substitute Parts

Part Overview

The ISL8485ECP is a 1/1 half-duplex RS422/RS485 transceiver manufactured by Renesas Electronics Corporation in 8-DIP packaging. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The ISL8485ECP operates within a 4.5V to 5.5V supply range with a 10Mbps data rate and 70mV receiver hysteresis, designed for industrial communication applications requiring half-duplex serial transmission.

Key Parameters

Parameter	ISL8485ECP Value
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Receiver Hysteresis	70 mV
Data Rate	10Mbps
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
RoHS Status	RoHS non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the ISL8485ECP is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Protocol: RS422/RS485 half-duplex transceiver
Configuration: 1/1 drivers/receivers
Package: 8-DIP (0.300", 7.62mm)
Mounting: Through Hole
Receiver Hysteresis: 70mV (critical for signal integrity)
Supply Voltage Range: Compatibility with 4.5V ~ 5.5V operation
Operating Temperature: Minimum 0°C ~ 70°C support

Substitute Categories:

Category A - Direct Electrical Equivalents (70mV Hysteresis): Parts with matching 70mV receiver hysteresis provide direct functional equivalence: LTC485CN8#PBF, MAX1487CPA+, MAX1487EPA+, MAX481CPA+, MAX481ECPA+, MAX481EPA+

Category B - Functional Equivalents (20mV Hysteresis): Parts with 20mV receiver hysteresis offer tighter noise margins but remain functionally compatible: LT1785ACN8#PBF, LT1785AIN8#PBF, LT1785CN8#PBF, LT1785IN8#PBF

All substitute parts maintain 8-DIP through-hole packaging, half-duplex RS422/RS485 protocol support, and 1/1 driver/receiver configuration.

Parameter Comparison

Part Number	Manufacturer	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temperature	RoHS Status	Product Status
ISL8485ECP	Renesas Electronics	70 mV	10Mbps	4.5V ~ 5.5V	0°C ~ 70°C	Non-compliant	Obsolete
LT1785ACN8#PBF	Analog Devices Inc.	20 mV	250kbps	4.75V ~ 5.25V	0°C ~ 70°C	ROHS3 Compliant	Active
LT1785AIN8#PBF	Analog Devices Inc.	20 mV	250kbps	4.75V ~ 5.25V	-40°C ~ 85°C	ROHS3 Compliant	Active
LT1785CN8#PBF	Analog Devices Inc.	20 mV	250kbps	4.75V ~ 5.25V	0°C ~ 70°C	ROHS3 Compliant	Active
LT1785IN8#PBF	Analog Devices Inc.	20 mV	250kbps	4.75V ~ 5.25V	-40°C ~ 85°C	ROHS3 Compliant	Active
LTC485CN8#PBF	Analog Devices Inc.	70 mV	Not specified	4.75V ~ 5.25V	0°C ~ 70°C	ROHS3 Compliant	Active
MAX1487CPA+	Analog Devices Inc./Maxim Integrated	70 mV	2.5Mbps	4.75V ~ 5.25V	0°C ~ 70°C	ROHS3 Compliant	Active
MAX1487EPA+	Analog Devices Inc./Maxim Integrated	70 mV	2.5Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	ROHS3 Compliant	Active
MAX481CPA+	Analog Devices Inc./Maxim Integrated	70 mV	2.5Mbps	4.75V ~ 5.25V	0°C ~ 70°C	ROHS3 Compliant	Active
MAX481ECPA+	Analog Devices Inc./Maxim Integrated	70 mV	2.5Mbps	4.75V ~ 5.25V	0°C ~ 70°C	ROHS3 Compliant	Active
MAX481EPA+	Analog Devices Inc./Maxim Integrated	70 mV	2.5Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: All substitute parts listed are ROHS3 compliant, addressing the non-compliant status of the obsolete ISL8485ECP. Selection should prioritize active production status parts to ensure long-term availability and supply chain stability.

For Matching Operating Temperature Range (0°C ~ 70°C): LT1785ACN8#PBF, LT1785CN8#PBF, LTC485CN8#PBF, MAX1487CPA+, MAX481CPA+, and MAX481ECPA+ maintain the original 0°C to 70°C operating window.

For Extended Temperature Range (-40°C ~ 85°C): LT1785AIN8#PBF, LT1785IN8#PBF, MAX1487EPA+, and MAX481EPA+ provide broader temperature operation for applications requiring industrial or automotive thermal specifications.

For Receiver Hysteresis Matching (70mV): LTC485CN8#PBF, MAX1487CPA+, MAX1487EPA+, MAX481CPA+, MAX481ECPA+, and MAX481EPA+ maintain the 70mV hysteresis specification of the original part, ensuring identical noise immunity characteristics.

For Supply Voltage Compatibility: All substitutes operate within 4.75V ~ 5.25V, which overlaps with the ISL8485ECP's 4.5V ~ 5.5V range. Applications operating at the lower boundary (4.5V ~ 4.75V) require verification against substitute minimum specifications.

Frequently Asked Questions (FAQ)

Q: Can LT1785 series parts directly replace ISL8485ECP? A: LT1785 parts are functionally compatible as RS422/RS485 half-duplex transceivers in 8-DIP packaging. However, they feature 20mV receiver hysteresis versus the ISL8485ECP's 70mV, resulting in tighter noise margins. Data rate is also reduced to 250kbps. These differences are acceptable for most industrial applications but should be evaluated against specific system noise and bandwidth requirements.

Q: What is the significance of receiver hysteresis in transceiver selection? A: Receiver hysteresis determines the voltage differential required to switch the receiver output, affecting noise immunity. The ISL8485ECP's 70mV hysteresis provides greater noise rejection in electrically noisy environments. Substitutes with 20mV hysteresis offer tighter switching thresholds suitable for cleaner signal environments but may require additional filtering in high-noise applications.

Q: Are all substitute parts available in the same 8-DIP through-hole package? A: Yes, all listed substitutes are packaged in 8-DIP (0.300", 7.62mm) through-hole format, ensuring direct PCB compatibility without layout modifications.

Q: Which substitute offers the best long-term availability? A: MAX1487EPA+ and MAX481EPA+ are actively produced by Analog Devices Inc./Maxim Integrated with the highest inventory levels (4463 and 4320 units respectively) and extended temperature range support, making them optimal for new designs requiring supply chain continuity.

Q: How does supply voltage range affect substitution? A: The ISL8485ECP operates at 4.5V ~ 5.5V while all substitutes operate at 4.75V ~ 5.25V. Applications using supply voltages below 4.75V or above 5.25V require the original part or custom voltage regulation. Standard 5V systems fall within all specifications.

Q: What is the impact of data rate differences on system compatibility? A: The ISL8485ECP supports 10Mbps while LT1785 series supports 250kbps and MAX series supports 2.5Mbps. For applications requiring data rates above 2.5Mbps, only the ISL8485ECP meets specifications. For standard industrial RS485 applications typically operating at 9.6kbps to 115.2kbps, all substitutes are suitable.

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