MAX485CSA RS422/RS485 Half-Duplex Transceiver Equivalent & Substitute Parts

Part Overview

The MAX485CSA is a half-duplex RS422/RS485 transceiver manufactured by Analog Devices Inc./Maxim Integrated, packaged in 8-SOIC surface mount configuration. This part is classified as obsolete, with 8,184 units available in new original stock. The MAX485CSA operates as a 1/1 transceiver (one driver, one receiver) with a 2.5 Mbps data rate and 70 mV receiver hysteresis, designed for industrial communication networks requiring half-duplex serial transmission.

Due to its obsolete status, identifying equivalent and substitute parts ensures design continuity and supply chain reliability. Substitute parts maintain functional compatibility through matching electrical specifications, mechanical packaging, and protocol support while offering active product status and improved compliance certifications.

Key Parameters

Parameter	MAX485CSA
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Receiver Hysteresis	70 mV
Data Rate	2.5 Mbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the MAX485CSA are classified into three categories based on substitution type and functional equivalence:

Direct Manufacturer Substitutes maintain identical electrical and mechanical specifications with improved product status and compliance. These parts share the same base product number (MAX485) or equivalent functionality with matching receiver hysteresis (70 mV), data rate (2.5 Mbps), supply voltage (4.75V ~ 5.25V), operating temperature (0°C ~ 70°C), and 8-SOIC packaging.

Parametric Equivalents provide functional compatibility through matching core electrical parameters while using different base product numbers within the MAX series. These parts maintain 1/1 transceiver configuration, half-duplex operation, RS422/RS485 protocol support, identical supply voltage range, operating temperature, and package specifications.

Cross-Manufacturer Alternatives from STMicroelectronics and Analog Devices Linear Technology division offer equivalent functionality with identical electrical specifications and packaging, ensuring interchangeability in circuit designs.

Upgrade Options extend operating temperature range beyond the original specification, suitable for applications requiring enhanced thermal performance.

Key parameters determining substitution eligibility:

Protocol support (RS422/RS485)
Transceiver configuration (1/1 driver/receiver)
Duplex mode (Half)
Supply voltage range (4.75V ~ 5.25V)
Package type (8-SOIC)
Receiver hysteresis (70 mV preferred; 50 mV acceptable with circuit validation)

Parameter Comparison

Part Number	Manufacturer	Product Status	Receiver Hysteresis	Data Rate	Operating Temperature	RoHS Status	Inventory (Pcs)
MAX485CSA	Analog Devices Inc./Maxim	Obsolete	70 mV	2.5 Mbps	0°C ~ 70°C	RoHS non-compliant	8,184
MAX485CSA+	Analog Devices Inc./Maxim	Active	50 mV	2.5 Mbps	0°C ~ 70°C	ROHS3 Compliant	3,220
MAX1487CSA+	Analog Devices Inc./Maxim	Active	70 mV	2.5 Mbps	0°C ~ 70°C	ROHS3 Compliant	2,330
MAX1487ECSA+	Analog Devices Inc./Maxim	Active	70 mV	2.5 Mbps	0°C ~ 70°C	ROHS3 Compliant	3,600
MAX481CSA+	Analog Devices Inc./Maxim	Active	70 mV	2.5 Mbps	0°C ~ 70°C	ROHS3 Compliant	3,600
MAX481ECSA+	Analog Devices Inc./Maxim	Active	70 mV	2.5 Mbps	0°C ~ 70°C	ROHS3 Compliant	2,300
MAX485ECSA+	Analog Devices Inc./Maxim	Active	70 mV	2.5 Mbps	0°C ~ 70°C	ROHS3 Compliant	2,354
LTC485CS8#PBF	Analog Devices Inc.	Active	70 mV	Not specified	0°C ~ 70°C	ROHS3 Compliant	3,213
LTC485CS8#TRPBF	Analog Devices Inc.	Active	70 mV	Not specified	0°C ~ 70°C	ROHS3 Compliant	20,100
ST485CDR	STMicroelectronics	Active	70 mV	2.5 Mbps	0°C ~ 70°C	ROHS3 Compliant	74,700
LTC485IS8#PBF	Analog Devices Inc.	Active	70 mV	Not specified	-40°C ~ 85°C	ROHS3 Compliant	3,900

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement)

MAX485ECSA+ and MAX485CSA+ are direct substitutes from the same manufacturer and product line. Both maintain active product status and ROHS3 compliance. MAX485ECSA+ matches the original 70 mV receiver hysteresis specification, while MAX485CSA+ features 50 mV hysteresis with improved noise immunity. Selection between these depends on circuit design requirements for receiver threshold sensitivity.

Parametric Equivalents (Functional Compatibility)

MAX1487CSA+, MAX1487ECSA+, MAX481CSA+, and MAX481ECSA+ provide equivalent functionality through matching electrical specifications and active product status. These parts are suitable for applications where base product number variation is acceptable. All maintain ROHS3 compliance and identical operating parameters to the original specification.

Cross-Manufacturer Alternatives

ST485CDR from STMicroelectronics offers the highest inventory availability (74,700 units) with matching electrical specifications, 8-SOIC packaging, and ROHS3 compliance. This part is suitable for high-volume production requiring supply chain redundancy.

LTC485CS8#PBF and LTC485CS8#TRPBF from Analog Devices Linear Technology division provide equivalent functionality with active product status and ROHS3 compliance. LTC485CS8#TRPBF offers significantly higher inventory (20,100 units) in cut tape and digi-reel packaging format.

Upgrade Option

LTC485IS8#PBF extends the operating temperature range to -40°C ~ 85°C, suitable for industrial and automotive applications requiring enhanced thermal performance beyond the standard 0°C ~ 70°C range. This part maintains all other electrical specifications and ROHS3 compliance.

Compliance Consideration

All substitute parts are ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete MAX485CSA. This compliance improvement is mandatory for new designs and recommended for legacy system updates.

Frequently Asked Questions (FAQ)

Q: Can MAX485CSA+ be used as a direct replacement for MAX485CSA?

A: Yes, MAX485CSA+ is a direct substitute with identical packaging, protocol support, and electrical specifications. The primary difference is 50 mV receiver hysteresis compared to the original 70 mV. This reduced hysteresis provides improved noise immunity and is compatible with standard RS422/RS485 circuit designs. Verify receiver threshold requirements in your specific application before substitution.

Q: What is the difference between MAX485ECSA+ and MAX485CSA+?

A: Both are active substitutes for the obsolete MAX485CSA. MAX485ECSA+ maintains the original 70 mV receiver hysteresis specification, while MAX485CSA+ features 50 mV hysteresis. Selection depends on circuit design sensitivity to receiver threshold levels. Both are ROHS3 compliant and available in tube packaging.

Q: Are MAX1487 and MAX481 series parts compatible with MAX485CSA designs?

A: Yes, MAX1487CSA+, MAX1487ECSA+, MAX481CSA+, and MAX481ECSA+ are parametric equivalents with matching electrical specifications, 8-SOIC packaging, and protocol support. These parts are suitable substitutes when base product number variation is acceptable in your design documentation and supply chain management.

Q: Can I use ST485CDR instead of MAX485CSA?

A: Yes, ST485CDR from STMicroelectronics is a cross-manufacturer equivalent with identical electrical specifications, 8-SOIC packaging, 70 mV receiver hysteresis, and 2.5 Mbps data rate. This part offers the highest inventory availability and is suitable for applications where manufacturer diversification is beneficial for supply chain resilience.

Q: What is the advantage of LTC485IS8#PBF over other substitutes?

A: LTC485IS8#PBF extends the operating temperature range to -40°C ~ 85°C compared to the standard 0°C ~ 70°C specification. This upgrade is suitable for industrial, automotive, and harsh environment applications requiring enhanced thermal performance. All other electrical specifications and ROHS3 compliance remain equivalent to standard substitutes.

Q: Are there packaging differences between substitute parts?

A: Most substitutes use 8-SOIC surface mount packaging identical to the original MAX485CSA. LTC485CS8#TRPBF is available in cut tape and digi-reel format, suitable for high-volume automated assembly. Verify packaging format compatibility with your procurement and assembly processes before selection.

Q: Is ROHS3 compliance mandatory for my application?

A: All substitute parts listed are ROHS3 compliant. The original MAX485CSA is RoHS non-compliant. If your application, customer requirements, or regional regulations mandate RoHS compliance, any substitute part from this list satisfies that requirement.

Q: Can I mix different substitute parts in the same design?

A: Yes, all listed substitutes are functionally equivalent and can be used interchangeably in circuit designs. However, maintain consistent part selection within a single production batch to ensure uniform receiver hysteresis characteristics and thermal performance across manufactured units.

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