PS323CPA Equivalent & Substitute Parts

Part Overview

The PS323CPA is a dual-circuit SPST-NO (Single Pole Single Throw - Normally Open) IC switch manufactured by Diodes Incorporated, designed for general-purpose switching applications in interface circuits. This component features 35Ohm on-state resistance and operates across a 2.5V to 16V supply range in an 8-DIP through-hole package.

The PS323CPA is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production or maintenance requirements for systems utilizing this interface switch.

Substiute Parts

PS323CPA

Diodes IncorporatedIn Stock: 766PS323CPA Datasheet

Current PartRFQ

MAX323CPA+

Analog Devices Inc./Maxim IntegratedIn Stock: 1209MAX323CPA+ Datasheet

MFR RecommendedRFQ

MAX323EPA+

Analog Devices Inc./Maxim IntegratedIn Stock: 973MAX323EPA+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PS323CPA must satisfy the following core substitution criteria:

• Identical switch circuit topology: SPST - NO with 2 circuits in 1:1 configuration
• Compatible package: 8-DIP (0.300", 7.62mm) through-hole mounting
• Matching channel count and capacitance specifications: 9pF channel capacitance
• Equivalent leakage current performance: 100pA maximum
• Identical crosstalk performance: -85dB @ 1MHz
• Matching charge injection: 1pC
• Matching channel-to-channel resistance matching: 800mOhm
• Operating temperature range compatibility: 0°C ~ 70°C minimum
• Supply voltage compatibility within the 2.5V ~ 16V range

The substitute parts identified (MAX323CPA+ and MAX323EPA+) maintain functional equivalence through these core parameters. Variations in on-state resistance and switching time are within acceptable tolerance for interface switching applications where the PS323CPA was deployed.

Parameter Comparison

Engineering Selection Recommendations

MAX323CPA+ (Primary Substitute)

The MAX323CPA+ is the recommended primary substitute for the PS323CPA. This part maintains active product status with Analog Devices Inc./Maxim Integrated, ensuring long-term availability and supply chain stability. The MAX323CPA+ achieves ROHS3 compliance, addressing regulatory requirements that the obsolete PS323CPA does not meet. All critical electrical parameters align with the PS323CPA: identical channel capacitance (9pF), leakage current (100pA), crosstalk performance (-85dB @ 1MHz), and charge injection (1pC). The on-state resistance increases from 35Ohm to 60Ohm, and switching times double (150ns/100ns vs. 75ns/50ns), which remain within acceptable operational margins for interface switching applications. The supply voltage range shifts minimally from 2.5V to 2.7V minimum, maintaining compatibility with standard logic supply voltages.

MAX323EPA+ (Secondary Substitute)

The MAX323EPA+ is classified as obsolete and carries ROHS3 compliance. Limited technical specifications are provided for this part. While it maintains the 8-DIP package format and dual-circuit SPST configuration, the absence of detailed electrical parameters limits its suitability as a primary selection. This part may be considered only when MAX323CPA+ availability is constrained and design margins accommodate unspecified parameter variations.

Frequently Asked Questions (FAQ)

Q: Can the MAX323CPA+ directly replace the PS323CPA in existing designs?

A: The MAX323CPA+ is functionally equivalent for interface switching applications. The primary differences are increased on-state resistance (60Ohm vs. 35Ohm) and doubled switching times (150ns/100ns vs. 75ns/50ns). These changes are acceptable in most interface circuits where switching speed is not a critical timing constraint. The identical package footprint (8-DIP) and pin configuration enable direct board-level substitution without layout modifications.

Q: What is the impact of the 25Ohm increase in on-state resistance?

A: The on-state resistance increase from 35Ohm to 60Ohm affects signal attenuation and power dissipation in switching paths. For low-impedance signal routing or high-current switching applications, this increase may require circuit analysis to confirm acceptable performance. For standard interface switching with moderate current levels, the 60Ohm specification remains within typical design tolerances.

Q: Are there supply voltage compatibility concerns?

A: The MAX323CPA+ minimum supply voltage is 2.7V compared to the PS323CPA's 2.5V. This 0.2V difference is negligible for standard 3.3V and 5V logic supplies. Systems operating at the lower 2.5V boundary may require verification that the MAX323CPA+ operates reliably at the intended supply voltage.

Q: Does the MAX323CPA+ meet current regulatory requirements?

A: Yes. The MAX323CPA+ is ROHS3 compliant, meeting current environmental and material restriction directives. The PS323CPA is RoHS non-compliant. For new designs or systems subject to RoHS requirements, the MAX323CPA+ is the appropriate selection.

Q: What is the significance of the MSL rating?

A: Both the PS323CPA and MAX323CPA+ carry MSL 1 (Unlimited) ratings, indicating no moisture sensitivity constraints during storage or handling. Standard component storage practices apply without special humidity control requirements.

Q: Can the MAX323EPA+ be used as an alternative?

A: The MAX323EPA+ maintains the 8-DIP package and dual-circuit SPST configuration. However, incomplete technical specifications limit confidence in parameter equivalence. This part should be considered only when MAX323CPA+ supply is unavailable and design margins accommodate unspecified electrical characteristics.