P1553AC Equivalent & Substitute Parts

Part Overview

The P1553AC is a three-element SIDACtor® thyristor transient voltage suppressor manufactured by Littelfuse Inc., designed for transient overvoltage protection in electronic circuits. This component features a 130V off-state voltage rating with 400A peak pulse current capability in an 8/20µs waveform, housed in a 3-SIP TO-220 modified package. The P1553AC is classified as obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and new design implementations where equivalent performance is required.

Substiute Parts

P1553AC

Littelfuse Inc.In Stock: 2462P1553AC Datasheet

Current PartRFQ

P1553ACL

LittelfuseIn Stock: 1625P1553ACL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P1553AC is determined by electrical and mechanical parameter equivalence across the following criteria:

• Voltage ratings (breakover, off-state, and on-state) must match exactly
• Peak pulse current ratings for both 8/20µs and 10/1000µs waveforms must be identical
• Hold current (Ih) specification must be equivalent
• Number of elements must remain at 3
• Capacitance values must fall within the specified range
• Package type (3-SIP) and mounting configuration (Through Hole, TO-220 Modified) must be preserved

The P1553ACL qualifies as a direct substitute based on complete electrical and mechanical parameter alignment with the P1553AC.

Parameter Comparison

Engineering Selection Recommendations

The P1553ACL is the qualified substitute for the P1553AC. Both components maintain identical electrical specifications and mechanical packaging, ensuring direct functional equivalence in circuit applications. The P1553ACL offers the advantage of active product status, providing ongoing availability and supply chain continuity. Additionally, the P1553ACL meets ROHS3 compliance requirements, whereas the P1553AC is non-compliant. For new designs or system upgrades, the P1553ACL is the appropriate selection. For legacy system maintenance requiring the exact original component, the P1553AC remains available in existing inventory.

Frequently Asked Questions (FAQ)

Q: Can the P1553ACL directly replace the P1553AC in existing circuits?

A: Yes. The P1553ACL provides complete electrical and mechanical equivalence to the P1553AC. All voltage ratings, current specifications, hold current, element count, capacitance values, and package configuration are identical, enabling direct substitution without circuit modification.

Q: What is the difference between the P1553AC and P1553ACL?

A: The primary differences are product status and regulatory compliance. The P1553AC is obsolete and RoHS non-compliant, while the P1553ACL is an active product meeting ROHS3 compliance standards. Electrical and mechanical specifications are identical.

Q: Are there any packaging differences between these parts?

A: No. Both the P1553AC and P1553ACL use the 3-SIP package with TO-220 modified supplier device packaging and through-hole mounting configuration. PCB layout and thermal management considerations remain unchanged.

Q: Why should I use the P1553ACL instead of the P1553AC?

A: The P1553ACL is recommended for new designs and ongoing system maintenance due to its active product status, ensuring long-term availability and supply chain reliability. The P1553ACL also meets current RoHS3 environmental compliance requirements.

Q: Are the capacitance specifications identical?

A: Yes. Both components specify capacitance values of 60pF and 95pF, maintaining identical circuit behavior in transient suppression applications.