CR3100SC Equivalent & Substitute Parts

Part Overview

The CR3100SC is a Transient Voltage Suppressor (TVS) thyristor manufactured by Littelfuse Inc., designed for overvoltage protection in surface-mount applications. This component operates at 275V off-state voltage with a peak pulse current rating of 250A (8/20µs). The CR3100SC is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and component procurement.

Substiute Parts

CR3100SC

Littelfuse Inc.In Stock: 998CR3100SC Datasheet

Current PartRFQ

P3100SCLRP

Littelfuse Inc.In Stock: 64451P3100SCLRP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CR3100SC is determined by the following critical parameters:

• Voltage Rating Match: Breakover voltage of 350V and off-state voltage of 275V must remain constant
• Current Handling Capability: Peak pulse current (8/20µs) must meet or exceed 250A
• Package Compatibility: DO-214AA, SMB surface-mount package required
• Single Element Configuration: One-element thyristor design
• On-State Voltage: Operating voltage in conducting state
• Hold Current: Minimum current to maintain thyristor conduction

The P3100SCLRP qualifies as a direct substitute based on matching voltage ratings, package type, and element count, while providing enhanced current handling and improved compliance status.

Parameter Comparison

Engineering Selection Recommendations

The P3100SCLRP is the qualified substitute for the obsolete CR3100SC based on the following criteria:

Electrical Compatibility: Both parts maintain identical voltage ratings (350V breakover, 275V off-state) and hold current specifications (150mA). The P3100SCLRP provides superior peak pulse current capability (400A versus 250A at 8/20µs), ensuring enhanced protection margin in transient suppression applications.

Package and Mounting: Both components use the DO-214AA, SMB surface-mount package, enabling direct PCB footprint compatibility without layout modifications.

Compliance and Availability: The P3100SCLRP is classified as active product status with ROHS3 compliance, addressing regulatory requirements and ensuring long-term supply chain availability. The CR3100SC, marked as obsolete, presents procurement and compliance risks for new designs or production continuity.

Series Designation: The P3100SCLRP belongs to the SIDACtor® series, representing the current generation of Littelfuse TVS thyristor technology.

Frequently Asked Questions (FAQ)

Q: Can the P3100SCLRP directly replace the CR3100SC in existing designs?

A: Yes. Both parts share identical voltage ratings, hold current specifications, and DO-214AA package geometry. The P3100SCLRP's higher peak pulse current rating (400A) provides additional protection margin without requiring circuit modifications.

Q: What is the significance of the higher peak pulse current in the P3100SCLRP?

A: The P3100SCLRP handles 400A peak pulse current (8/20µs) compared to the CR3100SC's 250A rating. This increased capability provides greater transient suppression headroom and improved reliability in high-energy surge environments.

Q: Are there packaging differences between these parts?

A: The CR3100SC is supplied in bulk packaging, while the P3100SCLRP is available in Tape & Reel (TR) format. Both use the same DO-214AA, SMB surface-mount package for PCB assembly.

Q: Why is RoHS compliance important for this substitution?

A: The P3100SCLRP meets ROHS3 compliance standards, satisfying regulatory requirements for new product designs and manufacturing in regulated markets. The CR3100SC's non-compliant status limits its use in applications subject to RoHS directives.

Q: Are there any electrical performance differences in on-state voltage?

A: The P3100SCLRP operates at 4V on-state voltage compared to the CR3100SC's 5V. This 1V difference is within normal operating margins for TVS thyristor applications and does not affect circuit compatibility.

Q: What is the capacitance difference between these parts?

A: The P3100SCLRP has 70pF capacitance versus the CR3100SC's 60pF. This 10pF increase is negligible for most transient suppression circuits and does not impact functional performance in standard applications.