FIN1531MX Equivalent & Substitute Parts

Part Overview

The FIN1531MX is a 4/0 LVDS driver IC manufactured by onsemi in a 16-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The FIN1531MX operates at 400 Mbps data rate with a 4.5V to 5.5V supply voltage range and -40°C to 85°C operating temperature range. Identifying compatible substitutes ensures design flexibility and supply chain resilience.

Key Parameters

Parameter	FIN1531MX
Manufacturer	onsemi
Type	Driver
Protocol	LVDS
Number of Drivers/Receivers	4/0
Data Rate	400 Mbps
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Package / Case: 16-SOIC (0.154", 3.90mm Width) — all substitutes must match this physical form factor
Number of Drivers/Receivers: 4/0 — functional pin count must be identical
Mounting Type: Surface Mount — all substitutes are surface mount compatible
Voltage - Supply range compatibility: substitutes must operate within or encompass the 4.5V ~ 5.5V range
Operating Temperature range: substitutes must support -40°C ~ 85°C or a subset thereof
Moisture Sensitivity Level: MSL 1 or MSL 2 are acceptable for substitution

Substitutes are grouped into two categories based on protocol and voltage characteristics:

Category A: RS422/RS485 Protocol Substitutes — AM26LS31CD, AM26LS31CDR, AM26LS31CDRG4. These parts operate at 4.75V ~ 5.25V (within the FIN1531MX range) and support 0°C ~ 70°C operating temperature.

Category B: Wide Voltage Range Substitutes — SN65LVDM31DG4, SN65LVDM31DR, TB5D1MD, TB5D2HD, TB5D2HDR. These parts support 3V ~ 5.5V or 3V ~ 3.6V supply ranges and -40°C ~ 85°C operating temperature, providing extended environmental compatibility.

Parameter Comparison

Part Number	Manufacturer	Protocol	Voltage - Supply	Operating Temperature	Package / Case	Product Status	RoHS Status	MSL
FIN1531MX	onsemi	LVDS	4.5V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Obsolete	Not specified	1
AM26LS31CD	Texas Instruments	RS422, RS485	4.75V ~ 5.25V	0°C ~ 70°C	16-SOIC	Last Time Buy	ROHS3 Compliant	1
AM26LS31CDR	Texas Instruments	RS422, RS485	4.75V ~ 5.25V	0°C ~ 70°C	16-SOIC	Active	ROHS3 Compliant	1
AM26LS31CDRG4	Texas Instruments	RS422, RS485	4.75V ~ 5.25V	0°C ~ 70°C	16-SOIC	Last Time Buy	ROHS3 Compliant	1
SN65LVDM31DG4	Texas Instruments	Not specified	3V ~ 3.6V	-40°C ~ 85°C	16-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant	1
SN65LVDM31DR	Texas Instruments	Not specified	3V ~ 3.6V	-40°C ~ 85°C	16-SOIC	Active	ROHS3 Compliant	1
TB5D1MD	Texas Instruments	Not specified	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Active	ROHS3 Compliant	2
TB5D2HD	Texas Instruments	Not specified	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Active	ROHS3 Compliant	2
TB5D2HDR	Texas Instruments	Not specified	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Active	ROHS3 Compliant	2

Engineering Selection Recommendations

For Active Production: AM26LS31CDR and TB5D2HDR are recommended as primary substitutes. Both are active products with ROHS3 compliance and 16-SOIC packaging. AM26LS31CDR is available in Cut Tape and Digi-Reel packaging with 38,110 units in stock. TB5D2HDR supports the full -40°C ~ 85°C temperature range with 3V ~ 5.5V supply voltage, providing maximum environmental compatibility.

For Last Time Buy Scenarios: AM26LS31CD and AM26LS31CDRG4 remain available but are designated Last Time Buy. These parts are suitable for designs with 0°C ~ 70°C operating requirements and 4.75V ~ 5.25V supply specifications.

For Extended Temperature and Voltage Range: TB5D1MD and TB5D2HD offer active product status with 3V ~ 5.5V supply range and -40°C ~ 85°C operating temperature, matching the FIN1531MX environmental specifications exactly.

Compliance Considerations: All Texas Instruments substitutes are ROHS3 compliant. The FIN1531MX is REACH unaffected, as are all listed substitutes. ECCN classification remains EAR99 for all parts.

Frequently Asked Questions (FAQ)

Q: Can AM26LS31CDR directly replace FIN1531MX in all applications?

A: AM26LS31CDR matches the 16-SOIC package and 4/0 driver/receiver configuration. However, it operates at 4.75V ~ 5.25V (narrower than FIN1531MX's 4.5V ~ 5.5V) and supports 0°C ~ 70°C temperature range (narrower than -40°C ~ 85°C). Substitution is valid only if your application operates within these narrower specifications.

Q: What is the difference between TB5D2HDR and TB5D2HD?

A: Both parts are identical in electrical specifications and package. TB5D2HDR is supplied in Tape & Reel (TR) packaging, while TB5D2HD is supplied in Tube packaging. Selection depends on your assembly process requirements.

Q: Why do some substitutes list "Not specified" for Protocol?

A: Protocol information is provided only when explicitly available in the component data. Parts with unspecified protocol still meet the 4/0 driver configuration and 16-SOIC package requirements for substitution.

Q: Is SN65LVDM31DG4 suitable for replacement?

A: SN65LVDM31DG4 is discontinued at DiGi Electronics and operates at 3V ~ 3.6V, which does not encompass the FIN1531MX's 4.5V ~ 5.5V range. This part is not recommended for new designs. SN65LVDM31DR (active status) is the preferred alternative if this voltage range is required.

Q: What does MSL 2 (1 Year) mean compared to MSL 1 (Unlimited)?

A: MSL 1 indicates unlimited shelf life under controlled storage. MSL 2 requires use within one year of the manufacturing date under specified humidity conditions. Both are acceptable for substitution; MSL 2 parts require stricter inventory management.

Q: Are all substitutes ROHS3 compliant?

A: All Texas Instruments substitutes listed are ROHS3 compliant. The FIN1531MX compliance status is not specified in the provided data.

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