SP721AB Equivalent & Substitute Parts

Part Overview

The SP721AB is a Transient Voltage Suppressors (TVS) device manufactured by Littelfuse Inc., designed for circuit protection applications. This mixed-technology TVS device features 6 circuits in an 8-SOIC surface mount package. The SP721AB is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Active alternatives with identical electrical and mechanical specifications are available from the manufacturer.

Substiute Parts

SP721AB

Littelfuse Inc.In Stock: 17969SP721AB Datasheet

Current PartRFQ

SP721ABG

Littelfuse Inc.In Stock: 4725SP721ABG Datasheet

DirectRFQ

SP721ABTG

Littelfuse Inc.In Stock: 5309SP721ABTG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SP721AB is determined by the following critical parameters that must remain constant:

• Technology: Mixed Technology
• Number of Circuits: 6
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Applications: General Purpose
• Moisture Sensitivity Level: 1 (Unlimited)

The SP721AB has two manufacturer-recognized substitutes: SP721ABG and SP721ABTG. Both alternatives maintain identical electrical specifications and mechanical compatibility while differing only in packaging format (Tube versus Tape & Reel) and product status (Active versus Obsolete).

Parameter Comparison

Engineering Selection Recommendations

Both SP721ABG and SP721ABTG are direct functional equivalents to the SP721AB with identical electrical and mechanical specifications. Selection between these alternatives should be based on the following criteria:

SP721ABG is suitable for applications requiring tube packaging and is currently in active production status with ROHS3 compliance certification.

SP721ABTG is the manufacturer-recommended substitute, offered in Tape & Reel format for high-volume automated assembly operations, and maintains active product status with ROHS3 compliance certification.

Both substitutes provide improved compliance posture compared to the obsolete SP721AB, which carries RoHS non-compliant status. For new designs or procurement of existing designs, either SP721ABG or SP721ABTG is appropriate based on packaging and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can SP721ABG or SP721ABTG be used as direct replacements for SP721AB in existing designs?

A: Yes. Both parts are electrically and mechanically identical to the SP721AB. They share the same 8-SOIC package, circuit count, technology platform, and electrical characteristics. The substitution is valid for PCB assembly without design modifications.

Q: What is the difference between SP721ABG and SP721ABTG?

A: The primary difference is packaging format. SP721ABG is supplied in Tube packaging, while SP721ABTG is supplied in Tape & Reel format. Both parts are functionally identical and suitable for the same applications. Tape & Reel packaging is typically preferred for high-volume automated assembly.

Q: Why is the SP721AB marked as obsolete?

A: The SP721AB is obsolete due to its RoHS non-compliant status. Littelfuse Inc. has transitioned to active production of ROHS3-compliant equivalents (SP721ABG and SP721ABTG) to meet current regulatory requirements.

Q: Are there any compliance differences between the substitute parts and the original SP721AB?

A: Yes. The SP721AB is RoHS non-compliant, while both SP721ABG and SP721ABTG are ROHS3 compliant. Additionally, SP721ABG and SP721ABTG carry REACH Unaffected status, providing enhanced regulatory compliance for new applications.

Q: Which substitute part should be selected for new designs?

A: SP721ABTG is the manufacturer-recommended substitute and is preferred for new designs. It offers Tape & Reel packaging optimized for automated assembly and maintains full active production status with current compliance certifications.