PS381ESE Equivalent & Substitute Parts

Part Overview

The PS381ESE is a 2-circuit SPST-NO IC switch manufactured by Diodes Incorporated, designed for general-purpose switching applications in interface circuits. This part operates across a supply voltage range of 3V to 15V (single supply) or ±3V to ±8V (dual supply), with a maximum on-state resistance of 30Ohm and switching times of 130ns (Ton) and 75ns (Toff).

The PS381ESE is classified as obsolete. Equivalent substitute parts are available from Analog Devices Inc./Maxim Integrated to maintain design continuity and ensure long-term component availability for production and maintenance applications.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO
Number of Circuits	2
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	30Ohm
Channel-to-Channel Matching (ΔRon)	200mOhm
Voltage - Supply, Single (V+)	3V ~ 15V
Voltage - Supply, Dual (V±)	±3V ~ 8V
Switch Time (Ton, Toff) (Max)	130ns, 75ns
Charge Injection	2pC
Channel Capacitance (CS(off), CD(off))	12pF, 12pF
Current - Leakage (IS(off)) (Max)	100pA
Crosstalk	-90dB @ 1MHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-SOIC
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PS381ESE is based on the following critical parameters that must remain compatible:

Switch Circuit Type: SPST - NO (maintained across all substitutes)
Number of Circuits: 2 (maintained across all substitutes)
Multiplexer/Demultiplexer Configuration: 1:1 (maintained across all substitutes)
Voltage Supply Ranges: 3V ~ 15V (single) and ±3V ~ 8V (dual) (maintained across all substitutes)
Operating Temperature Range: -40°C ~ 85°C (maintained across all substitutes)
Package Type: 16-SOIC surface mount (maintained across all substitutes)
Compliance Standards: ROHS3 Compliant, REACH Unaffected (maintained across all substitutes)

The substitute parts MAX381ESE+ and MAX381ESE+T are functionally equivalent alternatives manufactured by Analog Devices Inc./Maxim Integrated. Both maintain identical circuit topology, voltage specifications, and operating temperature ranges. Differences in on-state resistance (35Ohm vs. 30Ohm), channel matching tolerance, switching times, and leakage current are within acceptable engineering tolerances for most interface switching applications. The primary distinction between the two substitutes is packaging format: MAX381ESE+ is supplied in Tube packaging, while MAX381ESE+T is supplied in Tape & Reel format.

Parameter Comparison

Parameter	PS381ESE	MAX381ESE+	MAX381ESE+T
Manufacturer	Diodes Incorporated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete	Active	Active
Switch Circuit Type	SPST - NO	SPST - NO	SPST - NO
Number of Circuits	2	2	2
Multiplexer/Demultiplexer Configuration	1:1	1:1	1:1
On-State Resistance (Max)	30Ohm	35Ohm	35Ohm
Channel-to-Channel Matching (ΔRon)	200mOhm	500mOhm	500mOhm
Voltage - Supply, Single (V+)	3V ~ 15V	3V ~ 15V	3V ~ 15V
Voltage - Supply, Dual (V±)	±3V ~ 8V	±3V ~ 8V	±3V ~ 8V
Switch Time (Ton, Toff) (Max)	130ns, 75ns	175ns, 100ns	175ns, 100ns
Charge Injection	2pC	2pC	2pC
Channel Capacitance (CS(off), CD(off))	12pF, 12pF	12pF, 12pF	12pF, 12pF
Current - Leakage (IS(off)) (Max)	100pA	200pA	200pA
Crosstalk	-90dB @ 1MHz	-90dB @ 1MHz	-90dB @ 1MHz
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging Format	-	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

The PS381ESE is obsolete and no longer in active production. The MAX381ESE+ and MAX381ESE+T are active, manufacturer-recommended substitutes from Analog Devices Inc./Maxim Integrated that maintain functional equivalence for SPST-NO switching applications.

Both substitute parts satisfy the same compliance requirements: ROHS3 Compliant, REACH Unaffected, and MSL 1 (Unlimited). Selection between MAX381ESE+ and MAX381ESE+T depends on procurement and assembly requirements:

MAX381ESE+ (Tube packaging): Suitable for lower-volume production runs, manual assembly, or applications where component traceability per individual unit is required.
MAX381ESE+T (Tape & Reel packaging): Suitable for high-volume automated assembly operations where continuous reel feeding is standard practice.

Both parts are electrically interchangeable within the specified operating parameters. The substitute parts exhibit slightly higher on-state resistance (35Ohm vs. 30Ohm), reduced channel matching tolerance (500mOhm vs. 200mOhm), and marginally slower switching times (175ns/100ns vs. 130ns/75ns). These differences are within acceptable tolerances for standard interface switching applications and do not affect functional compatibility in circuits designed for the PS381ESE.

Frequently Asked Questions (FAQ)

Q: Can MAX381ESE+ and MAX381ESE+T be used interchangeably in the same circuit?

A: Yes. Both parts are electrically identical and differ only in packaging format. MAX381ESE+ is supplied in Tube packaging, while MAX381ESE+T is supplied in Tape & Reel format. Selection depends on assembly method and procurement volume, not circuit performance.

Q: What is the impact of the 5Ohm increase in on-state resistance (30Ohm to 35Ohm)?

A: The substitute parts have a maximum on-state resistance of 35Ohm compared to the PS381ESE at 30Ohm. This 5Ohm difference represents a 16.7% increase in resistance. Applications sensitive to voltage drop across the switch or power dissipation must account for this parameter change during circuit validation.

Q: Are the substitute parts compatible with existing PCB layouts designed for the PS381ESE?

A: Both substitute parts use the same 16-SOIC package type and surface mount configuration. However, the physical package dimensions differ: PS381ESE uses 16-SOIC (0.295", 7.50mm Width), while MAX381ESE+ and MAX381ESE+T use 16-SOIC (0.154", 3.90mm Width). PCB footprints must be verified for compatibility before assembly.

Q: Do the substitute parts meet the same environmental and compliance standards?

A: Yes. Both MAX381ESE+ and MAX381ESE+T are ROHS3 Compliant, REACH Unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the PS381ESE specifications.

Q: What are the differences in switching performance between the PS381ESE and substitute parts?

A: The PS381ESE has faster switching times (Ton: 130ns, Toff: 75ns) compared to the substitute parts (Ton: 175ns, Toff: 100ns). Applications requiring high-speed switching must account for this 45ns and 25ns increase in switching delays, respectively. The substitute parts also exhibit higher leakage current (200pA vs. 100pA) and reduced channel matching tolerance (500mOhm vs. 200mOhm).

Q: Which substitute part should be selected for new designs?

A: For new designs, either MAX381ESE+ or MAX381ESE+T is acceptable. Selection is based on manufacturing requirements: use MAX381ESE+ for tube-based assembly processes or MAX381ESE+T for automated tape-and-reel assembly. Both parts are active products with established supply chains and long-term availability.

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