ISL8485ECPZ Equivalent & Substitute Parts

Part Overview

The ISL8485ECPZ is a half-duplex RS422/RS485 transceiver IC manufactured by Renesas Electronics Corporation in 8-DIP through-hole packaging. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functionality. The ISL8485ECPZ operates within a 4.5V to 5.5V supply range with a 10Mbps data rate capability and is fully RoHS3 compliant.

Key Parameters

Parameter	ISL8485ECPZ
Manufacturer	Renesas Electronics Corporation
Type	Transceiver
Protocol	RS422, RS485
Duplex Configuration	Half
Number of Drivers/Receivers	1/1
Receiver Hysteresis	70 mV
Data Rate	10 Mbps
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	RoHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the ISL8485ECPZ is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Protocol support: RS422/RS485 half-duplex operation
Package compatibility: 8-DIP through-hole form factor
Receiver hysteresis: 70 mV (matching ISL8485ECPZ specification)
Voltage supply range: Minimum 4.5V support for compatibility
Duplex configuration: Half-duplex only
Driver/Receiver count: 1/1 configuration

Secondary Compatibility Factors:

Data rate capability: Equal to or greater than 10 Mbps
Operating temperature range: Must support at least 0°C to 70°C
RoHS3 compliance and regulatory alignment

Parts meeting all primary criteria are direct substitutes. Parts with extended temperature ranges or higher data rates provide enhanced capability while maintaining functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Protocol	Receiver Hysteresis	Data Rate	Voltage Supply	Operating Temp	Product Status
ISL8485ECPZ	Renesas Electronics	RS422, RS485	70 mV	10 Mbps	4.5V ~ 5.5V	0°C ~ 70°C	Obsolete
LT1785ACN8#PBF	Analog Devices Inc.	RS422, RS485	20 mV	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	Active
LT1785AIN8#PBF	Analog Devices Inc.	RS422, RS485	20 mV	250 kbps	4.75V ~ 5.25V	-40°C ~ 85°C	Active
LT1785CN8#PBF	Analog Devices Inc.	RS422, RS485	20 mV	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	Active
LT1785IN8#PBF	Analog Devices Inc.	RS422, RS485	20 mV	250 kbps	4.75V ~ 5.25V	-40°C ~ 85°C	Active
LTC485CN8#PBF	Analog Devices Inc.	RS422, RS485	70 mV	Not specified	4.75V ~ 5.25V	0°C ~ 70°C	Active
MAX1487CPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	Active
MAX1487EPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	70 mV	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	Active
MAX481CPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	Active
MAX481ECPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	Active
MAX481EPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	70 mV	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	Active

Engineering Selection Recommendations

Direct Substitutes (Matching 70 mV Hysteresis):

The LTC485CN8#PBF, MAX1487CPA+, MAX1487EPA+, MAX481CPA+, MAX481ECPA+, and MAX481EPA+ are functionally equivalent to the ISL8485ECPZ based on receiver hysteresis specification. All substitute parts are active products with RoHS3 compliance and REACH unaffected status, providing supply continuity and regulatory alignment superior to the obsolete ISL8485ECPZ.

Temperature-Extended Variants:

The MAX1487EPA+ and MAX481EPA+ offer extended operating temperature ranges (-40°C to 85°C) compared to the standard 0°C to 70°C specification of the ISL8485ECPZ. These variants are suitable for applications requiring broader thermal performance while maintaining electrical equivalence.

Alternative Hysteresis Specification:

The LT1785 series (LT1785ACN8#PBF, LT1785AIN8#PBF, LT1785CN8#PBF, LT1785IN8#PBF) operates with 20 mV receiver hysteresis, differing from the ISL8485ECPZ specification. These parts remain functionally compatible for RS422/RS485 half-duplex applications but exhibit different input threshold characteristics. Selection depends on system noise immunity requirements.

Inventory Availability:

All substitute parts listed are in active production with confirmed stock levels ranging from 2,216 to 4,463 units, ensuring supply reliability for production and replacement applications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace ISL8485ECPZ with any of the listed substitutes?

A: Direct replacement depends on receiver hysteresis requirements. Parts with 70 mV hysteresis (LTC485CN8#PBF, MAX1487 series, MAX481 series) are electrically equivalent. LT1785 series parts with 20 mV hysteresis are functionally compatible but exhibit different input threshold behavior.

Q: What is the significance of receiver hysteresis in RS485 transceiver selection?

A: Receiver hysteresis determines the voltage differential required between the rising and falling threshold levels. Higher hysteresis (70 mV) provides greater noise immunity in electrically noisy environments. Lower hysteresis (20 mV) allows detection of smaller signal transitions but may be susceptible to noise-induced false triggering.

Q: Are all substitute parts compatible with 4.5V supply voltage?

A: No. The ISL8485ECPZ supports 4.5V minimum supply voltage. All listed substitutes specify 4.75V minimum supply voltage. System designs operating at 4.5V require verification of actual operating conditions before substitution.

Q: Which substitute offers the best temperature performance?

A: The MAX1487EPA+ and MAX481EPA+ provide the widest operating temperature range (-40°C to 85°C), compared to the ISL8485ECPZ specification of 0°C to 70°C. These variants are suitable for industrial and extended-temperature applications.

Q: Is the 8-DIP package identical across all parts?

A: Yes. All parts listed use the 8-DIP (0.300", 7.62mm) through-hole package with identical pinout compatibility for direct socket replacement.

Q: What is the data rate difference between ISL8485ECPZ and substitutes?

A: The ISL8485ECPZ specifies 10 Mbps maximum data rate. MAX1487 and MAX481 series support 2.5 Mbps. LT1785 series supports 250 kbps. All substitutes are suitable for applications operating at or below their specified data rates. Applications requiring 10 Mbps operation should verify substitute performance under actual system conditions.

Q: Are all parts RoHS3 compliant?

A: Yes. All listed parts are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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