P1500SB Equivalent & Substitute Parts

Part Overview

The P1500SB is a 140V off-state TVS thyristor from Littelfuse Inc.'s SIDACtor® series, housed in a DO-214AA (SMB) surface mount package. This component is designed for transient voltage suppression applications requiring 250A peak pulse current capability at 8/20µs waveform. The P1500SB is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement.

Substiute Parts

P1500SB

Littelfuse Inc.In Stock: 10343P1500SB Datasheet

Current PartRFQ

P1500SBLRP

Littelfuse Inc.In Stock: 5411P1500SBLRP Datasheet

DirectRFQ

SMP100LC-140

STMicroelectronicsIn Stock: 4249SMP100LC-140 Datasheet

MFR RecommendedRFQ

SMP100MC-140

STMicroelectronicsIn Stock: 2372SMP100MC-140 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P1500SB is determined by the following critical parameters:

• Voltage - Off State: Must be 140V to maintain circuit protection threshold
• Package / Case: Must be DO-214AA (SMB) for mechanical and electrical compatibility
• Mounting Type: Must be Surface Mount for PCB integration
• Number of Elements: Must be 1 element configuration
• Current - Hold (Ih): Must be 150mA for consistent device behavior

Substitute parts are grouped into two categories:

Direct Littelfuse Substitute: P1500SBLRP maintains identical electrical specifications with improved compliance status and active product availability.

Manufacturer-Recommended Alternatives: SMP100LC-140 and SMP100MC-140 from STMicroelectronics meet the core voltage and package requirements while offering enhanced current handling capabilities (300A–400A peak pulse current) and active product status.

Parameter Comparison

Engineering Selection Recommendations

P1500SBLRP is the direct equivalent substitute for P1500SB. It maintains identical electrical specifications while offering active product status and ROHS3 compliance. This part is recommended as the primary replacement for existing P1500SB designs.

SMP100LC-140 and SMP100MC-140 are manufacturer-recommended alternatives from STMicroelectronics. Both parts meet the core voltage and package requirements with active product status and full ROHS3 compliance. SMP100LC-140 provides 400A peak pulse current capability, while SMP100MC-140 provides 300A. Both exceed the original 250A specification, offering enhanced transient suppression margin. The 5V increase in breakover voltage (175V vs. 180V) remains within acceptable tolerance for most circuit protection applications.

Selection between these alternatives depends on current handling requirements and supply chain availability. All three substitute parts are available in active production status with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can P1500SBLRP be used as a direct replacement for P1500SB?

A: Yes. P1500SBLRP maintains identical electrical specifications including 140V off-state voltage, 250A peak pulse current (8/20µs), 150mA hold current, and DO-214AA package configuration. The primary differences are active product status and ROHS3 compliance.

Q: What are the key differences between Littelfuse and STMicroelectronics alternatives?

A: P1500SBLRP is a direct Littelfuse equivalent. SMP100LC-140 and SMP100MC-140 are STMicroelectronics alternatives that maintain the 140V off-state voltage and DO-214AA package but offer higher peak pulse current ratings (400A and 300A respectively) and a 5V lower breakover voltage (175V vs. 180V).

Q: Are the STMicroelectronics parts pin-compatible with P1500SB?

A: Yes. All substitute parts use the DO-214AA (SMB) package with identical pinout and mechanical dimensions, ensuring direct PCB compatibility.

Q: What is the impact of increased capacitance in substitute parts?

A: Substitute parts exhibit higher capacitance (55pF–65pF) compared to the original P1500SB (40pF). This may affect high-frequency circuit behavior. Circuit validation is recommended for applications with frequency-sensitive requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. P1500SBLRP, SMP100LC-140, and SMP100MC-140 are all ROHS3 compliant. The original P1500SB is RoHS non-compliant.

Q: What is the difference between SMP100LC-140 and SMP100MC-140?

A: Both parts are STMicroelectronics TRISIL™ series alternatives with identical voltage specifications. SMP100LC-140 provides 400A peak pulse current (8/20µs), while SMP100MC-140 provides 300A. SMP100LC-140 is supplied in Cut Tape (CT) & Digi-Reel® packaging, while SMP100MC-140 is supplied in Tape & Reel (TR) packaging.