P1803AC Equivalent & Substitute Parts

Part Overview

The P1803AC is a Transient Voltage Suppressors (TVS) thyristor manufactured by Littelfuse Inc. under the SIDACtor® series. This component is designed for overvoltage protection applications requiring 150V off-state voltage suppression with 400A peak pulse current capability in a 3-SIP through-hole package configuration. The P1803AC is currently classified as obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and new design implementations.

Substiute Parts

P1803AC

Littelfuse Inc.In Stock: 741P1803AC Datasheet

Current PartRFQ

P1803ACL

Littelfuse Inc.In Stock: 5307P1803ACL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P1803AC is determined by electrical and mechanical parameter equivalence. The following criteria establish direct substitutability:

• Voltage ratings: Breakover voltage of 210V, off-state voltage of 150V, and on-state voltage of 8V must remain constant
• Current specifications: Peak pulse current (8/20µs) of 400A and peak pulse current (10/1000µs) of 100A must be maintained
• Hold current: 150mA threshold must be preserved
• Element count: 3-element configuration required
• Capacitance: 55pF and 85pF specifications must match
• Package configuration: 3-SIP through-hole mounting in TO-220 Modified package required

The P1803ACL meets all these criteria and qualifies as a direct equivalent substitute for the obsolete P1803AC.

Parameter Comparison

Engineering Selection Recommendations

The P1803ACL is the direct substitute for the obsolete P1803AC. Both components share identical electrical and mechanical specifications, ensuring functional equivalence in circuit applications. The primary distinction between these parts is product status and regulatory compliance. The P1803AC is obsolete and RoHS non-compliant, while the P1803ACL is an active product with ROHS3 compliance and REACH unaffected status. For new designs and ongoing production requiring this TVS thyristor specification, the P1803ACL should be selected. For legacy system repairs where the original P1803AC is no longer available, the P1803ACL provides complete electrical and mechanical compatibility without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the P1803ACL be used as a direct replacement for the P1803AC in existing circuits?

A: Yes. The P1803ACL is electrically and mechanically identical to the P1803AC. All voltage ratings, current specifications, hold current, element count, capacitance values, and package configuration match exactly. No circuit modifications are required.

Q: What is the difference between the P1803AC and P1803ACL?

A: The components are functionally equivalent. The P1803AC is obsolete and RoHS non-compliant, while the P1803ACL is an active product with ROHS3 compliance and REACH unaffected status. Both use identical SIDACtor® technology and share the same electrical performance characteristics.

Q: Are there any packaging differences between these parts?

A: No. Both the P1803AC and P1803ACL use the 3-SIP through-hole package in TO-220 Modified configuration. They are mechanically interchangeable on PCBs designed for the original part.

Q: What parameters must remain constant when substituting TVS thyristors?

A: For the P1803AC/P1803ACL family, the following parameters must match: breakover voltage (210V), off-state voltage (150V), on-state voltage (8V), peak pulse current ratings (400A at 8/20µs and 100A at 10/1000µs), hold current (150mA), element count (3), capacitance values (55pF and 85pF), and package type (3-SIP).

Q: Is the P1803ACL suitable for new product designs?

A: Yes. The P1803ACL is an active product with current manufacturing support and regulatory compliance certifications. It is the appropriate choice for new designs requiring this TVS thyristor specification.