DS1878T SFP+ Controller Equivalent & Substitute Parts

Part Overview

The DS1878T is an SFP+ Controller integrated circuit manufactured by Analog Devices Inc./Maxim Integrated, designed for interface applications requiring analog and digital input processing with digital output control. The device is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement continuity. The DS1878T operates in the -40°C to 95°C temperature range and is packaged in a 28-WFQFN Exposed Pad surface mount configuration.

Substiute Parts

DS1878T

Analog Devices Inc./Maxim IntegratedIn Stock: 1246DS1878T Datasheet

Current PartRFQ

DS1878T+

Analog Devices Inc./Maxim IntegratedIn Stock: 4415DS1878T+ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The DS1878T+ qualifies as a direct substitute based on strict parameter equivalence across all critical electrical and mechanical specifications. Substitution is valid when the following parameters remain identical:

• Device Type: SFP+ Controller
• Package / Case: 28-WFQFN Exposed Pad
• Supplier Device Package: 28-TQFN (5x5)
• Input Type: Analog, Digital
• Output Type: Digital
• Current - Supply: 2.5 mA
• Operating Temperature Range: -40°C ~ 95°C
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The DS1878T+ maintains full electrical and mechanical compatibility with the obsolete DS1878T, differing only in product status (Active vs. Obsolete) and packaging format (Tube vs. unspecified).

Parameter Comparison

Engineering Selection Recommendations

The DS1878T+ is the appropriate substitute for the obsolete DS1878T. Selection is based on:

• Identical electrical specifications across all functional parameters
• Identical mechanical and thermal specifications
• Equivalent regulatory compliance (ROHS3, REACH Unaffected, EAR99 classification)
• Active product status ensuring ongoing availability and supply chain continuity
• No design modifications required for direct substitution in existing applications

Frequently Asked Questions (FAQ)

Q: Can DS1878T+ be used as a direct replacement for DS1878T in existing designs?

A: Yes. The DS1878T+ maintains identical electrical, mechanical, and thermal specifications. No circuit modifications or PCB layout changes are required.

Q: Are there differences in pin configuration between DS1878T and DS1878T+?

A: No. Both devices use the 28-TQFN (5x5) package with identical pinout and functional assignments.

Q: What is the primary reason for substitution?

A: The DS1878T is classified as obsolete. The DS1878T+ is an active product from the same manufacturer with equivalent specifications, ensuring long-term procurement availability.

Q: Are there compliance or certification differences?

A: No. Both parts maintain ROHS3 compliance, REACH Unaffected status, and identical EAR99 classification.

Q: Does packaging format affect electrical performance?

A: No. The DS1878T+ is supplied in Tube packaging, which is a distribution format only and does not affect device functionality or electrical characteristics.