ADM485JN Equivalent & Substitute Parts

Part Overview

The ADM485JN is a half-duplex RS422/RS485 transceiver manufactured by Analog Devices Inc., housed in an 8-DIP through-hole package. This interface IC is designed for industrial communication networks requiring robust serial data transmission. The part is currently obsolete, making equivalent substitutes necessary for new designs or system maintenance where continued supply is required.

Key Parameters

Parameter	ADM485JN
Manufacturer	Analog Devices Inc.
Type	Transceiver Half Duplex
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Receiver Hysteresis	70 mV
Data Rate	5 Mbps
Voltage Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the ADM485JN is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS422/RS485 half-duplex operation
Number of Drivers/Receivers: 1/1 configuration
Package: 8-DIP through-hole form factor
Voltage Supply: 4.75V ~ 5.25V
Receiver Hysteresis: 70 mV (primary electrical characteristic)
Data Rate: 5 Mbps or higher
Operating Temperature: 0°C ~ 70°C minimum range

Substitute parts are grouped into two categories:

Parametric Equivalents: Parts matching all critical parameters with identical or superior performance characteristics and active product status.

Similar Alternatives: Parts meeting core functional requirements (protocol, package, voltage) but with variations in secondary parameters such as data rate, receiver hysteresis, or operating temperature range.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Receiver Hysteresis	Data Rate	Voltage Supply	Operating Temp	Package	Product Status
ADM485JN	Analog Devices	RS422, RS485	1/1	70 mV	5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Obsolete
ADM1485JNZ	Analog Devices	RS422, RS485	1/1	70 mV	30 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
LTC1482CN8#PBF	Analog Devices	RS422, RS485	1/1	30 mV	4 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
LTC1482IN8#PBF	Analog Devices	RS422, RS485	1/1	30 mV	4 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Active
MAX1483CPA+	Analog Devices/Maxim	RS422, RS485	1/1	75 mV	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
MAX1487CPA+	Analog Devices/Maxim	RS422, RS485	1/1	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
MAX1487ECPA+	Analog Devices/Maxim	RS422, RS485	1/1	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
MAX1487EEPA+	Analog Devices/Maxim	RS422, RS485	1/1	70 mV	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Active
MAX1487EPA+	Analog Devices/Maxim	RS422, RS485	1/1	70 mV	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Active

Engineering Selection Recommendations

Primary Substitute (Parametric Equivalent): ADM1485JNZ is the direct parametric equivalent with identical receiver hysteresis (70 mV), matching voltage supply range, and identical operating temperature specification. This part carries active product status with ROHS3 compliance and REACH unaffected certification. The higher data rate (30 Mbps vs. 5 Mbps) provides performance headroom without compromising compatibility.

Secondary Substitutes (Similar Alternatives): MAX1487ECPA+, MAX1487EEPA+, and MAX1487EPA+ maintain the critical 70 mV receiver hysteresis and identical voltage supply specifications. These parts are active with full compliance certifications. The reduced data rate (2.5 Mbps) is suitable for applications not requiring the full 5 Mbps bandwidth of the original part.

Extended Temperature Range Options: LTC1482IN8#PBF and MAX1487EEPA+ extend the operating temperature range to -40°C ~ 85°C, accommodating industrial environments with wider thermal requirements. These parts maintain RS422/RS485 protocol compliance and 8-DIP packaging.

Limited Compatibility Alternatives: LTC1482CN8#PBF and MAX1483CPA+ meet core functional requirements but with parameter variations. LTC1482CN8#PBF operates at 4 Mbps with reduced receiver hysteresis (30 mV). MAX1483CPA+ operates at 250 kbps with 75 mV hysteresis. These are suitable only where application bandwidth and noise immunity requirements align with their specifications.

Frequently Asked Questions (FAQ)

Q: Can ADM1485JNZ directly replace ADM485JN without circuit modification? A: Yes. ADM1485JNZ is a parametric equivalent with identical receiver hysteresis (70 mV), voltage supply range (4.75V ~ 5.25V), and operating temperature specification (0°C ~ 70°C). The 8-DIP through-hole package and pinout are identical. The higher data rate (30 Mbps) provides backward compatibility.

Q: What is the difference between receiver hysteresis values in substitute parts? A: Receiver hysteresis determines the voltage differential required to switch the receiver output, affecting noise immunity. The ADM485JN specifies 70 mV. Substitutes with 70 mV (ADM1485JNZ, MAX1487 series) maintain identical noise immunity. Parts with 30 mV (LTC1482 series) or 75 mV (MAX1483CPA+) have different noise margins and should be evaluated for specific application requirements.

Q: Are all substitute parts RoHS3 compliant? A: All active substitute parts listed carry ROHS3 compliance certification. The original ADM485JN, being obsolete, does not have RoHS certification data provided.

Q: Can I use MAX1487 series parts in applications requiring 5 Mbps data rates? A: MAX1487 series parts are rated for 2.5 Mbps maximum data rate, which is lower than the ADM485JN specification of 5 Mbps. Use only where application bandwidth requirements do not exceed 2.5 Mbps. For full 5 Mbps compatibility, use ADM1485JNZ.

Q: What is the inventory status of substitute parts? A: ADM1485JNZ has 6,300 units in stock. LTC1482IN8#PBF has 5,200 units. MAX1487EPA+ has 4,463 units. MAX1487EEPA+ has 3,900 units. MAX1487ECPA+ has 3,289 units. MAX1487CPA+ has 2,270 units. MAX1483CPA+ has 2,548 units. LTC1482CN8#PBF has 1,375 units.

Q: Are there temperature-extended variants available? A: Yes. LTC1482IN8#PBF and MAX1487EEPA+ and MAX1487EPA+ operate across -40°C ~ 85°C, compared to the standard 0°C ~ 70°C range. These are suitable for industrial and automotive applications with extended thermal requirements.

Q: What packaging options are available for substitutes? A: All substitute parts maintain the 8-DIP (0.300", 7.62mm) through-hole package format. Tube packaging is standard for active parts. This ensures direct mechanical compatibility with existing PCB designs.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message