Littelfuse P3403AB TVS Thyristor Equivalent & Substitute Parts

Part Overview

The Littelfuse P3403AB is a 300V off-state, 250A peak pulse (8/20µs) transient voltage suppressor thyristor in a 3-SIP TO-220 modified package. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing system support and new design implementations. The SIDACtor® series thyristor provides overvoltage protection in three-phase applications through its multi-element configuration.

Substiute Parts

P3403AB

Littelfuse Inc.In Stock: 964P3403AB Datasheet

Current PartRFQ

P3403ABL

Littelfuse Inc.In Stock: 5390P3403ABL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P3403AB is determined by electrical and mechanical parameter equivalence within the SIDACtor® TVS thyristor family. The following parameters establish substitution validity:

• Voltage ratings: Breakover voltage (400V), off-state voltage (300V), and on-state voltage (8V) must match exactly
• Current specifications: Peak pulse current (8/20µs at 250A and 10/1000µs at 80A) and hold current (150mA) must be identical
• Element configuration: Three-element design for three-phase protection
• Capacitance range: 45pF to 65pF
• Package compatibility: 3-SIP TO-220 modified through-hole mounting

The P3403ABL qualifies as a direct substitute based on complete electrical and mechanical parameter alignment with the obsolete P3403AB.

Parameter Comparison

Engineering Selection Recommendations

The P3403ABL is the direct equivalent for the obsolete P3403AB. Selection between these parts is determined by product status and compliance requirements:

• P3403AB: Obsolete status; RoHS non-compliant; limited to legacy system repairs where original specifications are mandated
• P3403ABL: Active product status; ROHS3 compliant; REACH unaffected; suitable for new designs and ongoing production support

For applications requiring RoHS3 compliance and REACH compliance verification, the P3403ABL is the appropriate selection. Both parts maintain identical electrical performance and mechanical compatibility, ensuring direct substitution without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can P3403ABL replace P3403AB in existing assemblies? A: Yes. The P3403ABL provides complete electrical and mechanical equivalence. All voltage ratings, current specifications, element configuration, and package dimensions are identical. Direct substitution is valid without modification to PCB layout or circuit design.

Q: What is the difference between P3403AB and P3403ABL? A: The primary differences are product status and compliance certifications. P3403AB is obsolete and RoHS non-compliant. P3403ABL is an active product that meets ROHS3 compliance and is REACH unaffected. Electrical and mechanical specifications are identical.

Q: Are there packaging differences between these parts? A: Both parts use 3-SIP TO-220 modified through-hole packages. P3403AB is supplied in standard packaging, while P3403ABL is supplied in bulk packaging. Pin configuration and PCB footprint are identical.

Q: Which part should be selected for new designs? A: The P3403ABL should be selected for new designs. It is an active product with current compliance certifications (ROHS3, REACH unaffected) and ensures long-term supply availability.

Q: Are the electrical characteristics guaranteed to be identical? A: Yes. Both parts share identical specifications for breakover voltage (400V), off-state voltage (300V), on-state voltage (8V), peak pulse currents (250A at 8/20µs, 80A at 10/1000µs), hold current (150mA), and capacitance range (45–65pF).