P0300SB Equivalent & Substitute Parts

Part Overview

The P0300SB is a 25V off-state TVS thyristor manufactured by Littelfuse Inc. in the SIDACtor® series, housed in a DO-214AA (SMB) surface mount package. This component is designed for transient voltage suppression applications requiring 250 A peak pulse current capability at 8/20µs waveform. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production support.

Substiute Parts

P0300SB

Littelfuse Inc.In Stock: 5506P0300SB Datasheet

Current PartRFQ

P0300SBLRP

Littelfuse Inc.In Stock: 5198P0300SBLRP Datasheet

DirectRFQ

SMP100LC-25

STMicroelectronicsIn Stock: 17976SMP100LC-25 Datasheet

MFR RecommendedRFQ

SMP100LC-35

STMicroelectronicsIn Stock: 45354SMP100LC-35 Datasheet

MFR RecommendedRFQ

TISP4040H1BJR-S

Bourns Inc.In Stock: 29309TISP4040H1BJR-S Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P0300SB is determined by the following critical parameters: off-state voltage rating, breakover voltage, peak pulse current capability, on-state voltage, hold current, and package compatibility. All substitute parts must maintain the DO-214AA (SMB) surface mount package and support the same voltage class (25V off-state). The substitute parts are grouped into two categories:

Direct Equivalent (Same Electrical Specifications):

• P0300SBLRP: Identical electrical specifications with active product status and improved compliance

Higher Current Capability Alternatives (400A Peak Pulse):

• TISP4040H1BJR-S (Bourns Inc.): 25V off-state, 400A peak pulse, matching breakover voltage
• SMP100LC-25 (STMicroelectronics): 25V off-state, 400A peak pulse, lower breakover voltage (35V)

Higher Voltage Class Alternative:

• SMP100LC-35 (STMicroelectronics): 35V off-state, 400A peak pulse, for applications requiring higher voltage rating

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): P0300SBLRP is the primary substitute for P0300SB. Both parts share identical electrical specifications and package configuration. P0300SBLRP offers the advantage of active product status and ROHS3 compliance, making it suitable for new designs and production continuity.

For Enhanced Performance (Higher Current Capability): TISP4040H1BJR-S and SMP100LC-25 both provide 400A peak pulse current capability while maintaining 25V off-state voltage compatibility. TISP4040H1BJR-S matches the original breakover voltage (40V) and hold current (50mA), providing the closest electrical performance upgrade. SMP100LC-25 offers lower breakover voltage (35V) and higher hold current (150mA), suitable for applications where these parameter shifts are acceptable.

For Higher Voltage Applications: SMP100LC-35 is specified for 35V off-state applications and is not a direct substitute for 25V designs. This part is applicable only when circuit requirements permit higher voltage rating.

All active substitute parts carry ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), supporting modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can P0300SBLRP directly replace P0300SB in existing designs? A: Yes. P0300SBLRP maintains identical electrical specifications (25V off-state, 40V breakover, 250A peak pulse, 50mA hold current) and package configuration (DO-214AA, SMB). The primary difference is product status (active vs. obsolete) and improved RoHS compliance.

Q: What is the difference between the 250A and 400A variants? A: The 250A variants (P0300SB, P0300SBLRP) are rated for 250A peak pulse current at 8/20µs waveform. The 400A variants (TISP4040H1BJR-S, SMP100LC-25) provide higher transient current handling capability. Selection depends on circuit transient energy requirements.

Q: Are all substitute parts in the same package? A: Yes. All listed substitutes use the DO-214AA (SMB) surface mount package, ensuring mechanical and thermal compatibility with existing PCB layouts.

Q: What is the significance of breakover voltage differences? A: Breakover voltage determines the threshold at which the TVS thyristor transitions to the on-state. P0300SB and TISP4040H1BJR-S both specify 40V breakover. SMP100LC-25 specifies 35V breakover, which may affect circuit triggering behavior in applications with specific voltage transient profiles.

Q: Which substitute offers the best compliance profile? A: All active substitutes (P0300SBLRP, TISP4040H1BJR-S, SMP100LC-25, SMP100LC-35) carry ROHS3 compliance and unlimited MSL rating. P0300SBLRP provides the most direct compliance upgrade from the obsolete P0300SB while maintaining identical electrical performance.

Q: Can SMP100LC-35 be used in a 25V design? A: SMP100LC-35 is rated for 35V off-state voltage and is not a direct substitute for 25V applications. Use only when circuit design permits higher voltage rating.