P0721SALRP Equivalent & Substitute Parts

Part Overview

The P0721SALRP is a Transient Voltage Suppressor (TVS) device manufactured by Littelfuse Inc., utilizing mixed technology in a DO-214AA surface mount package. This component is designed for circuit protection applications, specifically in SLIC (Subscriber Line Interface Circuit) environments. The device is currently in active production status with 1136 units available in inventory. Finding equivalent or substitute parts may be necessary due to supply constraints, lead time requirements, or design optimization needs while maintaining electrical and mechanical compatibility.

Substiute Parts

P0721SALRP

Littelfuse Inc.In Stock: 1172P0721SALRP Datasheet

Current PartRFQ

SMP100LC-65

STMicroelectronicsIn Stock: 55194SMP100LC-65 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P0721SALRP is evaluated based on the following critical parameters that must align for functional equivalence:

Package Compatibility: Both the main part and substitute must use the DO-214AA (SMB) surface mount package to ensure PCB footprint compatibility and assembly process alignment.

Voltage Rating Alignment: The substitute part must operate within the voltage protection range of the original design. The P0721SALRP specifies 88V clamping voltage. Substitute parts with comparable voltage ratings (breakover and off-state voltages in the 65V to 88V range) are acceptable for SLIC circuit protection applications.

Circuit Configuration: Both parts must feature a single circuit (1 element) to maintain identical electrical topology and board layout requirements.

Compliance & Environmental Standards: Substitute parts must maintain ROHS3 compliance and MSL 1 rating to ensure regulatory acceptance and manufacturing process compatibility.

Technology Classification: While the P0721SALRP uses mixed technology, substitute parts from established TVS thyristor series (such as TRISIL™) with equivalent protection characteristics are acceptable.

The SMP100LC-65 from STMicroelectronics meets these substitution criteria through matching package type, single-element configuration, comparable voltage ratings, and identical compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Both the P0721SALRP and SMP100LC-65 are active production components with full ROHS3 compliance and REACH unaffected status, making them suitable for current and future regulatory environments. The identical MSL 1 rating ensures both parts can be processed through standard surface mount assembly workflows without additional moisture control measures.

The SMP100LC-65 offers significantly higher inventory availability (55100 units) compared to the P0721SALRP (1136 units), which may provide supply chain advantages for high-volume production requirements. Both components share identical ECCN and HTSUS classifications, simplifying export and import documentation.

Selection between these parts should be based on application-specific voltage protection requirements, supplier availability, and lead time considerations. The voltage rating differential (88V clamping versus 65V off-state/85V breakover) must be evaluated against the specific SLIC circuit protection thresholds in the target application.

Frequently Asked Questions (FAQ)

Q: Can the SMP100LC-65 be used as a direct replacement for the P0721SALRP?

A: Both parts share identical DO-214AA package specifications, single-circuit configuration, and compliance certifications. The voltage ratings differ slightly (88V clamping versus 65V/85V), so compatibility depends on whether the application circuit can operate within the SMP100LC-65 voltage protection window.

Q: Are there any PCB layout or assembly differences between these parts?

A: No. Both components use the DO-214AA (SMB) surface mount package, requiring identical PCB footprints and assembly processes. No design modifications are necessary for physical integration.

Q: Do both parts require the same moisture handling procedures?

A: Yes. Both parts carry MSL 1 (Unlimited) ratings, meaning they do not require special moisture control measures during storage or assembly. Standard manufacturing practices are sufficient.

Q: What is the difference between the voltage specifications listed for each part?

A: The P0721SALRP specifies 88V clamping voltage, while the SMP100LC-65 specifies 65V off-state and 85V breakover voltages. These represent different measurement points in the TVS protection characteristic. Application circuit requirements determine which voltage specification is appropriate.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both the P0721SALRP and SMP100LC-65 are ROHS3 compliant and REACH unaffected, meeting current and anticipated regulatory requirements for electronic component manufacturing and distribution.

Q: Which part should be selected for new designs?

A: Selection should be based on the specific voltage protection requirements of the SLIC circuit, supplier lead times, and inventory availability. Both parts are active production components suitable for new designs.