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PS391ESE Equivalent & Substitute Parts
Part Overview
The PS391ESE is a 4-circuit SPST-NC analog switch manufactured by Diodes Incorporated in 16-SOIC packaging. This interface component operates across single supply (3V to 15V) and dual supply (±3V to ±8V) configurations with 45Ohm on-state resistance and 130ns/75ns switching times. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.
Substiute Parts
Key Parameters
| Parameter | PS391ESE Value |
|---|---|
| Switch Circuit | 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 | -40°C ~ 85°C (TA) |
| Package / Case | 16-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS non-compliant |
| MSL | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility is determined by the following mandatory criteria:
Primary Compatibility Requirements:
- Switch circuit type: SPST - NC
- Number of circuits: 4
- Multiplexer/Demultiplexer circuit: 1:1
- Mounting type: Surface Mount
- Package type: 16-SOIC
Electrical Parameter Tolerance Bands:
- On-state resistance must not exceed application requirements; lower resistance values are acceptable
- Supply voltage ranges must encompass or exceed the PS391ESE operating envelope (3V ~ 15V single supply, ±3V ~ 8V dual supply)
- Operating temperature range must cover or exceed -40°C ~ 85°C
- Switching time, charge injection, and crosstalk specifications must be suitable for the intended application
Compliance Considerations:
- RoHS3 compliance preferred for new designs; RoHS non-compliant parts acceptable for legacy applications
- MSL rating of 1 (Unlimited) required for all substitutes
Substitute parts are grouped by on-state resistance characteristics and supply voltage compatibility, as these parameters directly determine circuit performance and application suitability.
Parameter Comparison
| Part Number | Manufacturer | On-State Resistance (Max) | Voltage - Supply, Single (V+) | Voltage - Supply, Dual (V±) | Switch Time (Ton, Toff) (Max) | Charge Injection | Channel Capacitance (CS(off), CD(off)) | Current - Leakage (IS(off)) (Max) | Crosstalk | Operating Temperature | Package / Case | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PS391ESE | Diodes Incorporated | 45Ohm | 3V ~ 15V | ±3V ~ 8V | 130ns, 75ns | 3pC | 12pF, 12pF | 100pA | -90dB @ 1MHz | -40°C ~ 85°C | 16-SOIC (0.295", 7.50mm) | Obsolete | RoHS non-compliant |
| MAX391ESE+ | Analog Devices Inc./Maxim Integrated | 35Ohm | 3V ~ 15V | ±3V ~ 8V | 130ns, 75ns | 2pC | 9pF, 9pF | 100pA | -85dB @ 1MHz | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant |
| MAX391ESE+T | Analog Devices Inc./Maxim Integrated | 35Ohm | 3V ~ 15V | ±3V ~ 8V | 130ns, 75ns | 2pC | 9pF, 9pF | 100pA | -85dB @ 1MHz | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant |
| MAX391CSE+ | Analog Devices Inc./Maxim Integrated | 35Ohm | 3V ~ 15V | ±3V ~ 8V | 130ns, 75ns | 2pC | 9pF, 9pF | 100pA | -85dB @ 1MHz | 0°C ~ 70°C | 16-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant |
| MAX391CSE+T | Analog Devices Inc./Maxim Integrated | 35Ohm | 3V ~ 15V | ±3V ~ 8V | 130ns, 75ns | 2pC | 9pF, 9pF | 100pA | -85dB @ 1MHz | 0°C ~ 70°C | 16-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant |
| DG271BDY-E3 | Vishay Siliconix | 50Ohm | — | ±15V | 65ns, 65ns | -5pC | 8pF, 8pF | 1nA | -100dB @ 100kHz | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant |
| DG271BDY-T1-E3 | Vishay Siliconix | 50Ohm | — | ±15V | 65ns, 65ns | -5pC | 8pF, 8pF | 1nA | -100dB @ 100kHz | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant |
| DG454EY-T1-E3 | Vishay Siliconix | 5.3Ohm | 12V ~ 36V | ±5V ~ 15V | 118ns, 97ns | 22pC | 31pF, 34pF | 500pA | -85dB @ 1MHz | -40°C ~ 125°C | 16-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant |
| MAX4511CSE+ | Analog Devices Inc./Maxim Integrated | 160Ohm | 9V ~ 36V | ±4.5V ~ 18V | 500ns, 400ns | 1.5pC | 10pF, 5pF | 500pA | -66dB @ 1MHz | 0°C ~ 70°C | 16-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant |
| MAX4511CSE+T | Analog Devices Inc./Maxim Integrated | 160Ohm | 9V ~ 36V | ±4.5V ~ 18V | 500ns, 400ns | 1.5pC | 10pF, 5pF | 500pA | -66dB @ 1MHz | 0°C ~ 70°C | 16-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant |
| MAX4511ESE+ | Analog Devices Inc./Maxim Integrated | 160Ohm | 9V ~ 36V | ±4.5V ~ 18V | 500ns, 400ns | 1.5pC | 10pF, 5pF | 500pA | -66dB @ 1MHz | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (Closest Electrical Match):
MAX391ESE+ and MAX391ESE+T are direct functional equivalents to PS391ESE. Both maintain identical supply voltage ranges (3V ~ 15V single, ±3V ~ 8V dual), switching times (130ns/75ns), and leakage current (100pA). The lower on-state resistance (35Ohm vs. 45Ohm) and reduced charge injection (2pC vs. 3pC) provide improved performance. Both are ROHS3 compliant and active products. MAX391ESE+ and MAX391ESE+T differ only in packaging format (tube vs. tape & reel). The extended operating temperature range of MAX391ESE+ (-40°C ~ 85°C) matches PS391ESE; MAX391CSE+ and MAX391CSE+T are limited to 0°C ~ 70°C.
Secondary Substitutes (Extended Supply Voltage):
DG271BDY-E3 and DG271BDY-T1-E3 (Vishay Siliconix) support dual supply operation at ±15V, exceeding PS391ESE capability. On-state resistance is 50Ohm, within acceptable tolerance. Switching times are faster (65ns/65ns). These parts lack single supply voltage specification, limiting applicability to dual-supply circuits. Both are ROHS3 compliant and active.
Alternative Substitutes (Low Resistance Applications):
DG454EY-T1-E3 offers significantly lower on-state resistance (5.3Ohm) for applications requiring minimal signal attenuation. Supply voltage ranges differ substantially (12V ~ 36V single, ±5V ~ 15V dual), making this suitable only for higher-voltage circuits. Extended operating temperature range (-40°C ~ 125°C) and ROHS3 compliance are provided.
Higher Resistance Alternatives (Noise-Tolerant Applications):
MAX4511ESE+ provides extended operating temperature (-40°C ~ 85°C) with 160Ohm on-state resistance. Supply voltage ranges are 9V ~ 36V (single) and ±4.5V ~ 18V (dual), requiring higher supply voltages than PS391ESE. Slower switching times (500ns/400ns) and lower crosstalk performance (-66dB @ 1MHz) suit applications with relaxed speed requirements. ROHS3 compliant and active. MAX4511CSE+ and MAX4511CSE+T are identical except for operating temperature (0°C ~ 70°C) and packaging format.
Frequently Asked Questions (FAQ)
Q: Can MAX391CSE+ replace PS391ESE in all applications?
A: MAX391CSE+ is electrically compatible with PS391ESE for supply voltages and switching characteristics. However, its operating temperature range is limited to 0°C ~ 70°C, compared to PS391ESE's -40°C ~ 85°C. Use MAX391ESE+ or MAX391ESE+T for full temperature range compatibility.
Q: What is the difference between MAX391ESE+ and MAX391ESE+T?
A: Both parts are electrically identical. MAX391ESE+ is supplied in tube packaging; MAX391ESE+T is supplied in tape & reel format. Selection depends on assembly process requirements and volume.
Q: Why do DG271 parts specify only dual supply voltage (±15V) without single supply range?
A: DG271BDY-E3 and DG271BDY-T1-E3 are designed for dual-supply operation. Single supply voltage capability is not specified in the provided data. These parts are suitable only for circuits using ±15V dual supplies.
Q: Can DG454EY-T1-E3 replace PS391ESE in a 5V single-supply circuit?
A: No. DG454EY-T1-E3 requires minimum 12V single supply voltage. It is not compatible with PS391ESE's 3V ~ 15V range for applications operating below 12V.
Q: Are all substitute parts RoHS3 compliant?
A: All active substitute parts listed (MAX391 series, DG271 series, DG454 series, MAX4511 series) are ROHS3 compliant. PS391ESE is RoHS non-compliant. New designs should prioritize ROHS3-compliant substitutes.
Q: What is the significance of on-state resistance differences?
A: On-state resistance directly affects signal attenuation and power dissipation. Lower resistance (MAX391 at 35Ohm, DG454 at 5.3Ohm) reduces signal loss; higher resistance (MAX4511 at 160Ohm) increases attenuation. Selection depends on application signal levels and bandwidth requirements.
Q: Can MAX4511ESE+ replace PS391ESE?
A: MAX4511ESE+ maintains the -40°C ~ 85°C operating temperature range of PS391ESE and is ROHS3 compliant. However, its supply voltage requirements (9V ~ 36V single, ±4.5V ~ 18V dual) do not encompass PS391ESE's 3V ~ 15V single supply range. Use only in circuits with higher supply voltages.
Q: What packaging differences exist among substitutes?
A: All substitutes use 16-SOIC surface-mount packaging. PS391ESE package width is 0.295" (7.50mm); all active substitutes use 0.154" (3.90mm) width. Verify PCB layout compatibility before substitution. Packaging format (tube vs. tape & reel) affects supply and assembly logistics only.
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