SP2574NUTG Equivalent & Substitute Parts

Part Overview

The SP2574NUTG is a 2.5V reverse standoff, 12V clamping transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc. in a 10-UDFN surface mount package. Designed for Ethernet power line protection applications, this steering diode provides rail-to-rail protection with 4 unidirectional channels and automotive-grade qualification (AEC-Q101).

The SP2574NUTG is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this component.

Substiute Parts

SP2574NUTG

Littelfuse Inc.In Stock: 31629SP2574NUTG Datasheet

Current PartRFQ

SP2555NUTG

Littelfuse Inc.In Stock: 3262SP2555NUTG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SP2574NUTG is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Package / Case: 10-UDFN Exposed Pad (3x2) — ensures mechanical and electrical compatibility with existing PCB layouts
• Mounting Type: Surface Mount — maintains assembly process compatibility
• Type: Steering (Rail to Rail) — preserves circuit protection topology
• Unidirectional Channels: 4 — maintains functional channel count
• Voltage - Reverse Standoff (Typ): 2.5V — ensures consistent standoff voltage performance
• Operating Temperature Range: -40°C ~ 125°C — maintains thermal operating envelope
• Grade: Automotive — preserves automotive qualification requirement
• Qualification: AEC-Q101 — maintains automotive reliability standard

Allowable Parameter Variations:

• Voltage - Clamping (Max) @ Ipp: May increase (higher clamping voltage acceptable for higher transient energy absorption)
• Current - Peak Pulse (8/20µs): May increase (higher peak pulse current acceptable for enhanced protection capability)
• Power - Peak Pulse: May increase (higher peak pulse power acceptable)
• Capacitance @ Frequency: May vary (minor capacitance differences acceptable for Ethernet applications)
• Product Status: Active status preferred over obsolete for supply continuity

The SP2555NUTG meets all mandatory matching parameters and demonstrates allowable increases in clamping voltage (19V vs. 12V), peak pulse current (45A vs. 25A), and maintains identical package, mounting, channel configuration, and automotive qualification.

Parameter Comparison

Engineering Selection Recommendations

The SP2555NUTG is the manufacturer-recommended substitute for the obsolete SP2574NUTG. Both components maintain identical automotive-grade qualification (AEC-Q101) and ROHS3 compliance, ensuring regulatory and quality standards are preserved.

The SP2555NUTG provides enhanced transient protection capability through increased clamping voltage (19V vs. 12V) and peak pulse current (45A vs. 25A) while maintaining the same package footprint, channel configuration, and operating temperature range. This enhanced performance is compatible with existing circuit designs and does not introduce incompatibility.

The SP2555NUTG is currently in active production status, ensuring supply chain availability and long-term component sourcing stability compared to the obsolete SP2574NUTG.

Frequently Asked Questions (FAQ)

Q: Can the SP2555NUTG be used as a direct replacement for the SP2574NUTG?

A: Yes. The SP2555NUTG is the manufacturer-recommended substitute. Both components share identical package geometry (10-UDFN 3x2), mounting type (surface mount), channel configuration (4 unidirectional), reverse standoff voltage (2.5V), and automotive qualification (AEC-Q101). The SP2555NUTG provides higher clamping voltage and peak pulse current, which are allowable parameter increases for TVS diode substitution.

Q: What are the key differences between SP2574NUTG and SP2555NUTG?

A: The primary differences are clamping voltage (12V vs. 19V), peak pulse current (25A vs. 45A), and product status (obsolete vs. active). The SP2555NUTG offers enhanced transient energy absorption capability. All other critical parameters—package, mounting, channels, standoff voltage, temperature range, and automotive qualification—remain identical.

Q: Will the higher clamping voltage of the SP2555NUTG affect circuit performance?

A: No. Higher clamping voltage in a TVS diode substitute is acceptable and does not introduce circuit incompatibility. The 2.5V reverse standoff voltage remains identical, ensuring consistent circuit behavior during normal operation. The higher clamping voltage provides enhanced protection during transient events.

Q: Are both parts automotive-qualified?

A: Yes. Both SP2574NUTG and SP2555NUTG carry automotive-grade classification with AEC-Q101 qualification, meeting automotive reliability and quality standards.

Q: What is the packaging format for the SP2555NUTG?

A: The SP2555NUTG is supplied in Tape & Reel (TR) format, standard for high-volume surface mount assembly. The component footprint and pinout remain identical to the SP2574NUTG (10-UDFN 3x2).

Q: Is the SP2555NUTG RoHS compliant?

A: Yes. The SP2555NUTG is ROHS3 compliant, matching the environmental compliance status of the SP2574NUTG.