AP3987PS-13 Equivalent & Substitute Parts

Part Overview

The AP3987PS-13 is an offline switch IC manufactured by Diodes Incorporated, designed for power management applications in converter offline topology. This component is classified as obsolete, which necessitates identification of active equivalent parts for continued system design and procurement. The AP3987PS-13 operates as a primary-side controller in offline power conversion circuits and requires functional and electrical equivalents to maintain design continuity.

Substiute Parts

AP3987PS-13

Diodes IncorporatedIn Stock: 30352AP3987PS-13 Datasheet

Current PartRFQ

AP3987CTS7-13

Diodes IncorporatedIn Stock: 8288AP3987CTS7-13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The AP3987CTS7-13 qualifies as a manufacturer-recommended substitute based on the following substitution criteria:

Core Substitution Parameters:

• Shared base product number (AP3987) indicating common functional architecture
• Identical manufacturer (Diodes Incorporated) ensuring design continuity and support
• Same product category (Power Management PMIC) and application domain (offline converter control)
• Equivalent RoHS3 compliance and REACH unaffected status
• Compatible electrical specifications for offline switch operation

Topology Alignment: The AP3987CTS7-13 implements a Flyback with Secondary Side SR (Synchronous Rectification) topology, representing an enhanced variant of the base AP3987 architecture. This topology maintains functional compatibility with the original AP3987PS-13 design intent while providing improved efficiency characteristics through secondary-side synchronous rectification.

Package Consideration: The substitute part uses a 7-SO package (7 leads) versus the original 8-SOIC package. This represents a package variant within the same product family, requiring PCB layout verification to confirm pin compatibility and thermal performance equivalence.

Parameter Comparison

Engineering Selection Recommendations

Active Product Status: The AP3987CTS7-13 is classified as active, ensuring ongoing manufacturer support, availability, and compliance maintenance. The original AP3987PS-13 is obsolete, making the substitute the appropriate choice for new designs and ongoing procurement.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying current environmental and regulatory requirements for electronic components in most jurisdictions.

Inventory Availability: The AP3987CTS7-13 maintains substantial inventory (8200 Pcs New Original In Stock), providing supply chain reliability for production and development activities.

Package and Lead Configuration: The transition from 8-SOIC to 7-SO package requires PCB layout review. The reduced lead count necessitates verification of pin assignments and thermal management characteristics in the target application circuit.

Frequently Asked Questions (FAQ)

Q: Why is the AP3987PS-13 being discontinued? A: The AP3987PS-13 is classified as obsolete. The AP3987CTS7-13 represents the active equivalent within the AP3987 product family, offering enhanced topology (Secondary Side SR) and maintained regulatory compliance.

Q: Are the AP3987PS-13 and AP3987CTS7-13 pin-compatible? A: Both parts use SOIC package format with 3.90mm width. However, the AP3987CTS7-13 uses a 7-lead configuration versus the 8-lead original. Pin-by-pin verification against the respective datasheets is required before PCB implementation.

Q: What is the functional difference between these parts? A: The AP3987CTS7-13 implements Flyback topology with Secondary Side Synchronous Rectification, compared to the base offline converter topology of the AP3987PS-13. This enhancement improves efficiency while maintaining the same base product architecture and manufacturer support.

Q: Are there compliance differences between the two parts? A: Both parts are ROHS3 compliant and REACH unaffected. The MSL rating differs (1 versus 3), affecting moisture handling during storage and assembly. The AP3987CTS7-13 requires 168-hour dry-pack conditions, while the AP3987PS-13 has unlimited MSL rating.

Q: What is the supply status for the AP3987CTS7-13? A: The AP3987CTS7-13 is active with 8200 Pcs in stock, providing reliable availability for production and development requirements.

Q: Can I use the AP3987CTS7-13 as a direct replacement in existing designs? A: PCB layout and schematic verification is required due to package lead count differences. The electrical specifications and topology alignment support functional substitution, but physical layout changes may be necessary.