P3403AC Equivalent & Substitute Parts

Part Overview

The P3403AC is a Transient Voltage Suppressors (TVS) thyristor manufactured by Littelfuse Inc., designed for overvoltage protection applications. This component features a 300V off-state voltage rating with 400A peak pulse current capability in a 3-SIP through-hole package configuration. The product is currently classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

P3403AC

Littelfuse Inc.In Stock: 21720P3403AC Datasheet

Current PartRFQ

P3403ACL

Littelfuse Inc.In Stock: 2394P3403ACL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P3403AC is determined by electrical and mechanical parameter equivalence. The critical parameters defining substitutability are:

• Voltage ratings (breakover, off-state, and on-state)
• Peak pulse current specifications (8/20µs and 10/1000µs)
• Hold current (Ih)
• Number of elements (3-element configuration)
• Capacitance values
• Physical package type (3-SIP / TO-220 Modified through-hole)

The P3403ACL meets all these requirements with identical electrical specifications and package configuration, establishing it as a direct substitute. The primary distinction between these parts is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The P3403ACL is the direct substitute for the P3403AC. Both components share identical electrical specifications and physical package configurations, ensuring functional equivalence in circuit applications.

The P3403ACL is recommended for new designs and ongoing production due to its active product status and ROHS3 compliance certification. The P3403AC, classified as obsolete, should be replaced with the P3403ACL in systems requiring component refresh or long-term supply chain continuity.

For applications with existing P3403AC inventory, the P3403ACL provides a seamless transition path without circuit redesign, as all critical electrical and mechanical parameters remain unchanged.

Frequently Asked Questions (FAQ)

Q: Can the P3403ACL directly replace the P3403AC in existing circuits?

A: Yes. The P3403ACL is electrically and mechanically identical to the P3403AC. All voltage ratings, current specifications, hold current, element count, capacitance values, and package configuration are equivalent. Direct substitution is possible without circuit modification.

Q: What is the primary difference between P3403AC and P3403ACL?

A: The P3403AC is obsolete, while the P3403ACL is active. The P3403ACL also carries ROHS3 compliance certification, whereas the P3403AC is RoHS non-compliant. Electrical and physical specifications are identical.

Q: Are there any packaging differences between these parts?

A: No. Both the P3403AC and P3403ACL use the same 3-SIP through-hole package with TO-220 Modified supplier device package configuration. PCB layout and mounting procedures remain unchanged.

Q: Why should I transition from P3403AC to P3403ACL?

A: The P3403AC is obsolete and subject to supply discontinuation. The P3403ACL ensures long-term component availability and meets current RoHS3 compliance requirements for regulated markets.

Q: Are the electrical performance characteristics identical?

A: Yes. Both parts maintain 400V breakover voltage, 300V off-state voltage, 8V on-state voltage, 400A peak pulse current (8/20µs), 100A peak pulse current (10/1000µs), and 150mA hold current specifications.