PS391EPE Equivalent & Substitute Parts

Part Overview

The PS391EPE is a 4-circuit SPST-NC (Single Pole Single Throw - Normally Closed) IC switch manufactured by Diodes Incorporated in a 16-DIP package. This interface component features 45Ohm on-state resistance and operates across a supply voltage range of 3V to 15V (single supply) or ±3V to ±8V (dual supply). The product is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

PS391EPE

Diodes IncorporatedIn Stock: 960PS391EPE Datasheet

Current PartRFQ

DG271BCJ-E3

Vishay SiliconixIn Stock: 1198DG271BCJ-E3 Datasheet

MFR RecommendedRFQ

MAX391CPE+

Analog Devices Inc./Maxim IntegratedIn Stock: 1330MAX391CPE+ Datasheet

MFR RecommendedRFQ

MAX4511CPE+

Analog Devices Inc./Maxim IntegratedIn Stock: 1074MAX4511CPE+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PS391EPE is determined by the following mandatory parameters:

• Switch circuit topology: SPST - NC (Single Pole Single Throw - Normally Closed)
• Circuit count: 4 circuits
• Multiplexer configuration: 1:1
• Package type: 16-DIP (0.300", 7.62mm)
• Mounting type: Through Hole

All substitute parts listed maintain these core functional and physical characteristics. Variations in on-state resistance, supply voltage ranges, switching speed, and leakage current are acceptable within the scope of substitution, provided the substitute part meets or exceeds the application requirements for these secondary parameters.

Parameter Comparison

Engineering Selection Recommendations

DG271BCJ-E3 (Vishay Siliconix) is the primary recommended substitute. This part maintains identical circuit topology and package specifications while offering improved performance characteristics: faster switching times (65ns vs. 130ns/75ns), lower channel capacitance (8pF vs. 12pF), and superior crosstalk isolation (-100dB @ 100kHz vs. -90dB @ 1MHz). The DG271BCJ-E3 is currently in active production status and carries ROHS3 compliance. The dual supply voltage range (±15V) differs from the original PS391EPE but accommodates the original ±3V to ±8V requirement. On-state resistance is marginally higher at 50Ohm versus 45Ohm, representing a 5Ohm increase acceptable for most applications.

MAX391CPE+ (Analog Devices Inc./Maxim Integrated) provides an alternative with superior on-state resistance (35Ohm), lower charge injection (2pC), and identical switching characteristics to the PS391EPE. This part maintains the same supply voltage ranges (3V ~ 15V single, ±3V ~ 8V dual) and operating temperature range (-40°C ~ 85°C). The MAX391CPE+ is in active production and ROHS3 compliant. The operating temperature range is narrower (0°C ~ 70°C) compared to the original part, which may limit applicability in extended temperature environments.

MAX4511CPE+ (Analog Devices Inc./Maxim Integrated) is suitable only for applications requiring higher supply voltages (9V ~ 36V single, ±4.5V ~ 18V dual). This part exhibits significantly higher on-state resistance (160Ohm) and slower switching times (500ns/400ns), making it appropriate for lower-frequency or higher-impedance circuit designs. The MAX4511CPE+ is currently obsolete, similar to the PS391EPE.

For new designs requiring RoHS compliance and active product support, DG271BCJ-E3 or MAX391CPE+ are the preferred selections. For legacy system maintenance where RoHS compliance is not required, MAX4511CPE+ remains available as a functional equivalent.

Frequently Asked Questions (FAQ)

Q: Can the DG271BCJ-E3 directly replace the PS391EPE in existing designs?

A: Yes, with circuit verification. Both parts share identical SPST-NC topology, 4-circuit configuration, 1:1 multiplexing, and 16-DIP package. The DG271BCJ-E3 operates at ±15V dual supply versus the PS391EPE's ±3V to ±8V range. If your design uses ±15V or lower, the DG271BCJ-E3 is compatible. The 5Ohm higher on-state resistance (50Ohm vs. 45Ohm) must be evaluated against signal integrity and power dissipation requirements.

Q: What is the primary difference between MAX391CPE+ and DG271BCJ-E3?

A: MAX391CPE+ offers lower on-state resistance (35Ohm) and maintains the original PS391EPE supply voltage ranges (3V ~ 15V single, ±3V ~ 8V dual). DG271BCJ-E3 provides faster switching times and lower capacitance but requires ±15V dual supply operation. Select MAX391CPE+ for applications sensitive to on-state resistance; select DG271BCJ-E3 for high-speed switching applications.

Q: Is the MAX4511CPE+ suitable as a general replacement?

A: No. The MAX4511CPE+ is designed for higher supply voltage applications (9V ~ 36V) and exhibits 160Ohm on-state resistance, significantly higher than the PS391EPE's 45Ohm. Use MAX4511CPE+ only when your circuit operates at higher supply voltages and can tolerate increased on-state resistance and slower switching response.

Q: Do all substitute parts maintain the same package footprint?

A: Yes. All listed substitutes use the 16-DIP (0.300", 7.62mm) through-hole package, ensuring direct PCB compatibility without layout modifications.

Q: Which substitute offers the best RoHS compliance status?

A: Both DG271BCJ-E3 and MAX391CPE+ carry ROHS3 compliance certification. The PS391EPE and MAX4511CPE+ are RoHS non-compliant and ROHS3 compliant respectively. For new designs subject to RoHS requirements, DG271BCJ-E3 or MAX391CPE+ are mandatory selections.

Q: How do operating temperature ranges affect substitution?

A: The PS391EPE operates from -40°C to 85°C. MAX391CPE+ and MAX4511CPE+ are rated 0°C to 70°C, restricting use in extended low-temperature environments below 0°C. DG271BCJ-E3 maintains the full -40°C to 85°C range, making it suitable for applications requiring extended temperature operation.