SP721ABT Equivalent & Substitute Parts

Part Overview

The SP721ABT is a Transient Voltage Suppressors (TVS) device manufactured by Littelfuse Inc., designed for circuit protection applications. This component features mixed technology in an 8-SOIC surface mount package with six circuits for general-purpose transient voltage suppression. The SP721ABT is currently classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement planning.

Substiute Parts

SP721ABT

Littelfuse Inc.In Stock: 9165SP721ABT Datasheet

Current PartRFQ

SP721ABTG

Littelfuse Inc.In Stock: 5309SP721ABTG Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SP721ABT is determined by strict alignment of the following critical parameters:

• Package / Case: 8-SOIC (0.154", 3.90mm Width) — ensures mechanical and electrical compatibility with existing PCB layouts
• Number of Circuits: 6 — maintains functional equivalence for multi-channel protection
• Technology: Mixed Technology — preserves the electrical characteristics and performance profile
• Mounting Type: Surface Mount — confirms compatibility with assembly processes
• Applications: General Purpose — indicates suitability for the same circuit protection role
• Moisture Sensitivity Level (MSL): 1 (Unlimited) — ensures equivalent handling and storage requirements

The SP721ABTG meets all these criteria and qualifies as a direct substitute for the obsolete SP721ABT.

Parameter Comparison

Engineering Selection Recommendations

The SP721ABTG is the direct substitute for the SP721ABT. Both components share identical electrical and mechanical specifications, including package type, circuit count, and technology platform. The SP721ABTG offers the additional advantage of active product status, ensuring long-term availability and supply chain continuity. The SP721ABTG also provides ROHS3 compliance, meeting current environmental and regulatory requirements, whereas the SP721ABT is RoHS non-compliant. For new designs or ongoing production requiring circuit protection in the 8-SOIC package with six circuits, the SP721ABTG is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Can the SP721ABTG directly replace the SP721ABT in existing designs?

A: Yes. Both components are identical in package type (8-SOIC), circuit count (6), technology (mixed), and mounting method (surface mount). No PCB layout modifications are required.

Q: What is the primary reason to transition from SP721ABT to SP721ABTG?

A: The SP721ABT is obsolete, while the SP721ABTG maintains active product status. This ensures continued availability, supply chain reliability, and access to current manufacturing batches.

Q: Are there compliance differences between these parts?

A: Yes. The SP721ABTG is ROHS3 compliant, while the SP721ABT is RoHS non-compliant. For applications requiring environmental compliance, the SP721ABTG is the appropriate choice.

Q: Does packaging format affect electrical performance?

A: No. The SP721ABT is supplied in bulk packaging, while the SP721ABTG is supplied in Tape & Reel (TR) format. Both formats contain identical components; the difference is in handling and assembly convenience.

Q: Are moisture sensitivity requirements the same?

A: Yes. Both components have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.