P0720SB Equivalent & Substitute Parts

Part Overview

The P0720SB is a 65V off-state, 250A peak pulse TVS thyristor in DO-214AA (SMB) package manufactured by Littelfuse Inc. under the SIDACtor® series. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part provides transient voltage suppression for circuit protection applications requiring high current handling capability in a compact surface-mount package.

Substiute Parts

P0720SB

Littelfuse Inc.In Stock: 17844P0720SB Datasheet

Current PartRFQ

P0720SBLRP

Littelfuse Inc.In Stock: 7718P0720SBLRP Datasheet

DirectRFQ

SMP100LC-65

STMicroelectronicsIn Stock: 55194SMP100LC-65 Datasheet

MFR RecommendedRFQ

SMP50-68

STMicroelectronicsIn Stock: 3857SMP50-68 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P0720SB is determined by the following critical parameters: off-state voltage rating (65V), package type (DO-214AA/SMB), mounting configuration (surface mount), and current handling capability. The substitute parts are grouped into two categories based on electrical performance alignment:

Direct Packaging Substitute (Same Package, Same Voltage Rating):

• P0720SBLRP: Identical electrical specifications with active product status and RoHS3 compliance. Differs only in packaging format (Tape & Reel vs. bulk).

Cross-Manufacturer Substitutes (Equivalent Voltage & Current Performance):

• SMP100LC-65 (STMicroelectronics): Maintains 65V off-state voltage and DO-214AA package. Offers higher peak pulse current (400A vs. 250A) and improved RoHS3 compliance.
• SMP50-68 (STMicroelectronics): Operates at 68V off-state voltage with reduced peak pulse current (150A vs. 250A) and different package variant (DO-214AC/SMA).

Parameter Comparison

Engineering Selection Recommendations

P0720SBLRP is the primary direct substitute for P0720SB. Both parts share identical electrical specifications and package configuration. The primary distinction is product status: P0720SBLRP is active with ROHS3 compliance, whereas P0720SB is obsolete and non-compliant. Selection of P0720SBLRP eliminates obsolescence risk and satisfies modern regulatory requirements without circuit redesign.

SMP100LC-65 (STMicroelectronics) provides an active, RoHS3-compliant alternative maintaining the 65V off-state voltage and DO-214AA package footprint. This part exceeds the original current specification (400A vs. 250A peak pulse), providing design margin for transient suppression. The increased capacitance (90pF vs. 75pF) may require circuit validation in timing-sensitive applications.

SMP50-68 is suitable only when circuit design permits a 68V off-state voltage and reduced current handling (150A peak pulse). This part uses a different package variant (DO-214AC/SMA), requiring PCB layout modification. Selection is appropriate for lower-current protection requirements or space-constrained designs.

Frequently Asked Questions (FAQ)

Q: Can P0720SBLRP directly replace P0720SB without circuit modification? A: Yes. P0720SBLRP maintains identical electrical specifications (65V off-state, 250A peak pulse, 4V on-state) and package configuration (DO-214AA/SMB). No circuit redesign is required. The only difference is packaging format and active product status with RoHS3 compliance.

Q: What are the voltage compatibility limits for substitution? A: Off-state voltage must remain within the circuit's protection threshold. P0720SBLRP and SMP100LC-65 both operate at 65V off-state, matching the original specification. SMP50-68 operates at 68V off-state, representing a 3V increase. Breakover voltage variations (85V to 90V) must be evaluated against circuit transient profiles.

Q: Does SMP100LC-65 require circuit validation due to higher current rating? A: SMP100LC-65 provides 400A peak pulse capability versus the original 250A specification. This represents increased suppression capacity without reducing protection effectiveness. Capacitance increases from 75pF to 90pF; circuits with timing-critical signal paths should be evaluated for potential propagation delay changes.

Q: Can SMP50-68 be used in existing P0720SB designs? A: SMP50-68 substitution requires two modifications: (1) PCB layout change from DO-214AA (SMB) to DO-214AC (SMA) package, and (2) circuit validation for reduced current handling (150A vs. 250A peak pulse). This part is suitable only for applications where lower current protection is acceptable and package change is feasible.

Q: What is the significance of RoHS3 compliance for substitute selection? A: P0720SB is RoHS non-compliant; all active substitutes (P0720SBLRP, SMP100LC-65, SMP50-68) are ROHS3 compliant. Modern manufacturing and procurement standards require RoHS compliance. Selection of compliant parts eliminates regulatory risk and ensures compatibility with supply chain requirements.

Q: Are there packaging format considerations between P0720SB and P0720SBLRP? A: P0720SB is supplied in bulk packaging; P0720SBLRP is supplied in Tape & Reel (TR) format. Both use identical DO-214AA/SMB package and electrical specifications. Tape & Reel format is standard for automated assembly processes and does not affect component performance or PCB compatibility.