PS321CPA Equivalent & Substitute Parts

Part Overview

The PS321CPA is a 2-circuit SPST-NC (Single Pole Single Throw - Normally Closed) IC switch manufactured by Diodes Incorporated, housed in an 8-DIP package. This component features dual independent switch circuits with 35Ohm on-state resistance and operates across a dual supply voltage range of ±2.7V to ±8V. The PS321CPA is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

PS321CPA

Diodes IncorporatedIn Stock: 1025PS321CPA Datasheet

Current PartRFQ

ADG417BNZ

Analog Devices Inc.In Stock: 1660ADG417BNZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PS321CPA is determined by the following critical parameters:

• Switch Circuit Configuration: SPST-NC topology with normally closed operation
• On-State Resistance: Maximum 35Ohm specification
• Package Compatibility: 8-DIP through-hole form factor
• Operating Temperature Range: -40°C to 85°C
• Supply Voltage Compatibility: Dual supply operation capability

The ADG417BNZ qualifies as a functional substitute based on matching on-state resistance (35Ohm maximum), identical package type (8-DIP), equivalent operating temperature range, and compatible SPST-NC switch circuit topology. However, the ADG417BNZ contains a single circuit versus the dual circuits in the PS321CPA, requiring design consideration for applications dependent on the two-channel configuration.

Parameter Comparison

Engineering Selection Recommendations

The ADG417BNZ from Analog Devices Inc. is an active product with ROHS3 compliance, providing a path forward from the obsolete PS321CPA. The substitute maintains electrical equivalence in on-state resistance, package form factor, and operating temperature specifications. The ADG417BNZ demonstrates superior performance characteristics including lower charge injection (7pC versus 8pC) and reduced channel capacitance (6pF versus 9pF).

Design consideration is required for applications utilizing both circuits of the PS321CPA, as the ADG417BNZ provides a single circuit. In such cases, dual ADG417BNZ devices may be required to achieve equivalent functionality, or alternative multi-circuit switch ICs should be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the ADG417BNZ directly replace the PS321CPA in existing designs?

A: Direct pin-for-pin replacement is not applicable due to circuit count differences. The PS321CPA contains two independent switch circuits, while the ADG417BNZ contains one. PCB layout and schematic modifications are necessary if dual-circuit functionality is required.

Q: Are the package dimensions identical between PS321CPA and ADG417BNZ?

A: Yes. Both components use the 8-DIP (0.300", 7.62mm) through-hole package, enabling identical mounting on compatible PCBs.

Q: What are the key electrical differences between these parts?

A: Both maintain 35Ohm on-state resistance and identical operating temperature ranges. The ADG417BNZ exhibits lower leakage current (250pA versus 100pA), lower charge injection (7pC versus 8pC), and reduced channel capacitance (6pF versus 9pF). Switch timing is comparable, with ADG417BNZ Ton at 160ns versus PS321CPA at 150ns.

Q: Does the ADG417BNZ support the same supply voltage range as the PS321CPA?

A: The PS321CPA operates on dual supply ±2.7V to ±8V. The ADG417BNZ supports single supply 12V or dual supply ±15V. Applications requiring the lower voltage range of the PS321CPA must verify ADG417BNZ compatibility with existing power distribution.

Q: What is the compliance status difference between these parts?

A: The PS321CPA is RoHS non-compliant. The ADG417BNZ is ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and manufacturing.