PS391CSE Equivalent & Substitute Parts

Part Overview

The PS391CSE is a 4-circuit IC switch manufactured by Diodes Incorporated, configured as SPST-NC (Single Pole Single Throw - Normally Closed) with 1:1 multiplexer/demultiplexer functionality in a 16-SOIC package. This part operates with single supply voltage (3V to 15V) or dual supply (±3V to ±8V), featuring 45Ohm on-state resistance and 130ns/75ns switching times. The PS391CSE is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	PS391CSE Value
Switch Circuit Configuration	SPST - NC
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	45Ohm
Channel-to-Channel Matching (ΔRon)	500mOhm
Voltage - Supply, Single (V+)	3V ~ 15V
Voltage - Supply, Dual (V±)	±3V ~ 8V
Switch Time (Ton, Toff) (Max)	130ns, 75ns
-3dB Bandwidth	100MHz
Charge Injection	3pC
Channel Capacitance (CS(off), CD(off))	12pF, 12pF
Current - Leakage (IS(off)) (Max)	100pA
Crosstalk	-90dB @ 1MHz
Operating Temperature	0°C ~ 70°C
Package / Case	16-SOIC (0.295", 7.50mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PS391CSE is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Switch circuit configuration: SPST - NC
Number of circuits: 4
Multiplexer/demultiplexer circuit: 1:1
Package type: 16-SOIC surface mount
RoHS3 compliance and MSL rating

Performance Tolerance Parameters:

On-state resistance must not exceed application requirements
Supply voltage ranges must encompass the design operating point
Switch timing (Ton, Toff) must meet signal integrity requirements
Leakage current specifications must satisfy low-power constraints
Operating temperature range must cover the intended thermal environment

Substitute parts are grouped into three categories based on on-state resistance characteristics and supply voltage compatibility:

Group 1 - Low Resistance, Narrow Supply Range (3V-15V Single / ±3V-8V Dual): MAX391CSE+, MAX391CSE+T, MAX391ESE+, MAX391ESE+T. These parts maintain the original 35Ohm on-state resistance and identical supply voltage specifications.

Group 2 - Moderate Resistance, Dual Supply Only (±15V): DG271BDY-E3, DG271BDY-T1-E3. These parts feature 50Ohm on-state resistance with extended temperature range (-40°C to 85°C) but operate only on dual supply.

Group 3 - Very Low Resistance, Extended Supply Range (12V-36V Single / ±5V-15V Dual): DG454EY-T1-E3. This part offers 5.3Ohm on-state resistance with the widest supply voltage range and extended temperature capability (-40°C to 125°C).

Group 4 - High Resistance, Extended Supply Range (9V-36V Single / ±4.5V-18V Dual): MAX4511CSE+, MAX4511CSE+T, MAX4511ESE+. These parts feature 160Ohm on-state resistance suitable for high-impedance switching applications.

Parameter Comparison

Part Number	Manufacturer	Status	On-State Resistance (Max)	V+ Supply	V± Supply	Ton/Toff (Max)	Operating Temp	Package	Packaging Type
PS391CSE	Diodes Inc.	Obsolete	45Ohm	3V ~ 15V	±3V ~ 8V	130ns, 75ns	0°C ~ 70°C	16-SOIC	Tube
MAX391CSE+	Analog Devices/Maxim	Active	35Ohm	3V ~ 15V	±3V ~ 8V	130ns, 75ns	0°C ~ 70°C	16-SOIC	Tube
MAX391CSE+T	Analog Devices/Maxim	Active	35Ohm	3V ~ 15V	±3V ~ 8V	130ns, 75ns	0°C ~ 70°C	16-SOIC	Tape & Reel
MAX391ESE+	Analog Devices/Maxim	Active	35Ohm	3V ~ 15V	±3V ~ 8V	130ns, 75ns	-40°C ~ 85°C	16-SOIC	Tube
MAX391ESE+T	Analog Devices/Maxim	Active	35Ohm	3V ~ 15V	±3V ~ 8V	130ns, 75ns	-40°C ~ 85°C	16-SOIC	Tape & Reel
DG271BDY-E3	Vishay Siliconix	Active	50Ohm	—	±15V	65ns, 65ns	-40°C ~ 85°C	16-SOIC	Tube
DG271BDY-T1-E3	Vishay Siliconix	Active	50Ohm	—	±15V	65ns, 65ns	-40°C ~ 85°C	16-SOIC	Tape & Reel
DG454EY-T1-E3	Vishay Siliconix	Active	5.3Ohm	12V ~ 36V	±5V ~ 15V	118ns, 97ns	-40°C ~ 125°C	16-SOIC	Tape & Reel
MAX4511CSE+	Analog Devices/Maxim	Active	160Ohm	9V ~ 36V	±4.5V ~ 18V	500ns, 400ns	0°C ~ 70°C	16-SOIC	Tube
MAX4511CSE+T	Analog Devices/Maxim	Active	160Ohm	9V ~ 36V	±4.5V ~ 18V	500ns, 400ns	0°C ~ 70°C	16-SOIC	Tape & Reel
MAX4511ESE+	Analog Devices/Maxim	Active	160Ohm	9V ~ 36V	±4.5V ~ 18V	500ns, 400ns	-40°C ~ 85°C	16-SOIC	Tube

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

MAX391CSE+ and MAX391CSE+T are the preferred direct substitutes. These parts are manufactured by Analog Devices/Maxim Integrated and maintain identical electrical specifications to the PS391CSE: 35Ohm on-state resistance, 3V-15V single supply, ±3V-8V dual supply, and 130ns/75ns switching times. Both are ROHS3 compliant with MSL 1 rating. The CSE+ variant is supplied in tube packaging, while CSE+T is supplied in tape and reel format. Both are active products with full production support.

MAX391ESE+ and MAX391ESE+T offer the same electrical performance as the CSE variants but extend the operating temperature range to -40°C to 85°C, providing thermal margin for applications requiring wider temperature operation. These are also active products from Analog Devices/Maxim Integrated.

Alternative Substitutes (Application-Dependent Selection):

DG271BDY-E3 and DG271BDY-T1-E3 (Vishay Siliconix) are suitable when the design operates exclusively on dual supply voltages (±15V). These parts feature 50Ohm on-state resistance and faster switching times (65ns for both Ton and Toff). The extended operating temperature range (-40°C to 85°C) and active product status support long-term availability. Selection between tube (E3) and tape & reel (T1-E3) packaging depends on procurement volume and assembly requirements.

DG454EY-T1-E3 (Vishay Siliconix) is applicable for designs requiring very low on-state resistance (5.3Ohm) and extended supply voltage ranges (12V-36V single, ±5V-15V dual). This part supports the widest operating temperature range (-40°C to 125°C) and is supplied only in tape & reel format. Selection is appropriate when low-resistance switching paths are critical to system performance.

MAX4511CSE+, MAX4511CSE+T, and MAX4511ESE+ (Analog Devices/Maxim Integrated) are suitable for high-impedance switching applications requiring 160Ohm on-state resistance. These parts support extended supply voltage ranges (9V-36V single, ±4.5V-18V dual) and are active products. The ESE+ variant extends operating temperature to -40°C to 85°C.

Compliance and Certification:

All substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, matching the original PS391CSE specifications. All parts are classified as active products with ongoing manufacturer support, ensuring long-term procurement viability and technical documentation availability.

Frequently Asked Questions (FAQ)

Q: Can MAX391CSE+ directly replace PS391CSE in existing designs?

A: Yes. MAX391CSE+ and MAX391CSE+T are direct electrical and functional equivalents. Both maintain identical supply voltage ranges (3V-15V single, ±3V-8V dual), switching times (130ns/75ns), and on-state resistance specifications (35Ohm maximum). The 16-SOIC package pinout and functionality are identical. Packaging format differs: CSE+ is tube, CSE+T is tape & reel.

Q: What is the difference between MAX391CSE+ and MAX391ESE+?

A: Both parts are electrically identical with 35Ohm on-state resistance and matching switching characteristics. The primary difference is operating temperature range: CSE+ operates 0°C to 70°C, while ESE+ operates -40°C to 85°C. Select ESE+ when the application requires extended low-temperature operation or thermal margin beyond the original specification.

Q: When should DG271BDY be selected instead of MAX391 variants?

A: DG271BDY parts are appropriate when the design operates exclusively on dual supply voltages (±15V) and does not require single supply operation. DG271BDY offers faster switching times (65ns versus 130ns/75ns) and extended temperature range (-40°C to 85°C). If single supply operation (3V-15V) is required, MAX391 variants are mandatory.

Q: Is DG454EY-T1-E3 compatible with designs using PS391CSE?

A: DG454EY-T1-E3 is functionally compatible but operates under different electrical constraints. This part requires higher supply voltages (12V-36V single, ±5V-15V dual) and is not suitable for designs operating at 3V-8V supply levels. Selection is appropriate only when the design can accommodate the extended supply voltage range and benefits from the very low 5.3Ohm on-state resistance.

Q: What are the packaging implications when selecting between tube and tape & reel formats?

A: Tube packaging (E3 suffix) is standard for lower-volume procurement and manual assembly operations. Tape & reel packaging (T1-E3 or +T suffix) is required for automated pick-and-place assembly and high-volume production. Both formats contain identical parts; selection depends on assembly process and procurement volume requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—MAX391 series, DG271 series, DG454 series, and MAX4511 series—are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, matching the original PS391CSE compliance profile.

Q: Can MAX4511 series parts replace PS391CSE?

A: MAX4511 parts are not direct replacements. These parts feature 160Ohm on-state resistance (versus 45Ohm in PS391CSE) and require higher supply voltages (9V-36V single, ±4.5V-18V dual). Selection is appropriate only for high-impedance switching applications where the higher resistance and extended supply voltage range are compatible with circuit requirements.

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