DS2125/T&R SCSI Terminator - Equivalent & Substitute Parts

Part Overview

The DS2125/T&R is a SCSI LVD/SE terminator IC manufactured by Analog Devices Inc./Maxim Integrated, designed for 15-line SCSI termination applications. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The part is housed in a 48-LQFP surface mount package and operates across a 2.7V to 5.5V supply voltage range with a 0°C to 70°C operating temperature window.

Substiute Parts

DS2125/T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 846DS2125/T&R Datasheet

Current PartRFQ

UCC5638FQPTR

Texas InstrumentsIn Stock: 10202UCC5638FQPTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS2125/T&R is determined by strict alignment of the following electrical and mechanical parameters:

• SCSI Termination Type: Both main and substitute parts must support SCSI LVD/SE termination with identical termination line count (15 lines)
• Package Compatibility: 48-LQFP (7x7) surface mount package is required for PCB layout compatibility
• Supply Voltage Range: The substitute must operate within or encompass the 2.7V to 5.5V range
• Operating Temperature Range: The substitute must support the 0°C to 70°C operating window
• Compliance Standards: RoHS3 compliance and MSL rating must be maintained for manufacturing and storage requirements

The UCC5638FQPTR from Texas Instruments meets all substitution criteria as a functionally equivalent SCSI terminator with matching termination architecture, package form factor, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The UCC5638FQPTR is the qualified substitute for the obsolete DS2125/T&R based on the following factors:

• Functional Equivalence: Both parts provide 15-line SCSI LVD/SE termination in the identical 48-LQFP package, ensuring direct PCB compatibility without layout modifications
• Supply Voltage Consideration: The UCC5638FQPTR operates within 2.7V to 5.25V. Systems designed for the DS2125/T&R maximum of 5.5V should verify that actual operating voltage does not exceed 5.25V
• Active Product Status: The UCC5638FQPTR is in active production with documented inventory availability, ensuring long-term supply chain reliability compared to the obsolete DS2125/T&R
• Compliance Alignment: Both parts maintain ROHS3 compliance and identical MSL ratings, supporting equivalent manufacturing and storage protocols
• Temperature Range: Operating temperature specifications are identical, confirming thermal performance equivalence

Frequently Asked Questions (FAQ)

Q: Can the UCC5638FQPTR directly replace the DS2125/T&R without PCB modifications?

A: Yes. Both parts use the 48-LQFP (7x7) package with identical pinout for SCSI termination applications. Direct substitution on existing PCBs is possible without layout changes.

Q: What is the significance of the 0.25V difference in maximum supply voltage (5.5V vs. 5.25V)?

A: The DS2125/T&R supports up to 5.5V while the UCC5638FQPTR supports up to 5.25V. If your system operates at voltages between 5.25V and 5.5V, the substitute may not be suitable. Verify actual operating voltage in your application before substitution.

Q: Why is the DS2125/T&R listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The UCC5638FQPTR provides equivalent functionality and is actively manufactured, making it the appropriate choice for new designs and legacy system support.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts are ROHS3 compliant with identical MSL ratings of 3 (168 Hours), REACH unaffected status, and EAR99 ECCN classification. Compliance requirements are equivalent.

Q: What is the difference between the DS2125/T&R and UCC5638FQPTR in terms of SCSI termination performance?

A: Both parts provide 15-line SCSI LVD/SE termination. The electrical termination architecture and line count are identical, ensuring equivalent signal integrity performance in SCSI bus applications.

Q: Is the packaging format (Tape & Reel) a consideration for substitution?

A: Tape & Reel packaging affects handling and assembly processes but does not impact electrical or mechanical compatibility. The UCC5638FQPTR in Tape & Reel format is suitable for automated assembly environments equivalent to the original part.