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MAX394EWP Equivalent & Substitute Parts
Part Overview
The MAX394EWP is a 4-circuit SPDT (Single Pole Double Throw) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated. This component functions as a 2:1 multiplexer/demultiplexer with 35Ohm on-state resistance, designed for signal routing and switching applications in analog systems. The MAX394EWP is classified as obsolete, making identification of compatible substitute parts essential for ongoing production, maintenance, and design continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Switch Circuit Configuration | SPDT |
| Multiplexer/Demultiplexer Circuit | 2:1 |
| Number of Circuits | 4 |
| On-State Resistance (Max) | 35Ohm |
| Channel-to-Channel Matching (ΔRon) | 500mOhm |
| Voltage - Supply, Single (V+) | 2.7V ~ 15V |
| Voltage - Supply, Dual (V±) | ±2.7V ~ 8V |
| Switch Time (Ton, Toff) (Max) | 130ns, 75ns |
| Charge Injection | 5pC |
| Channel Capacitance (CS(off), CD(off)) | 12pF, 12pF |
| Current - Leakage (IS(off)) (Max) | 200pA |
| Crosstalk | -88dB @ 1MHz |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
Substitute Part Grouping Explanation
Substitution of the MAX394EWP is determined by strict equivalence across all electrical and mechanical parameters. The substitute part must maintain identical specifications for:
- Switch circuit topology (SPDT configuration)
- Number of independent circuits (4)
- Multiplexer/demultiplexer ratio (2:1)
- On-state resistance and channel matching characteristics
- Supply voltage ranges (single and dual supply)
- Switching speed parameters (Ton, Toff)
- Charge injection and capacitance specifications
- Leakage current and crosstalk performance
- Operating temperature range
- Physical package format (20-SOIC surface mount)
Only parts meeting all these criteria are classified as direct substitutes.
Parameter Comparison
| Parameter | MAX394EWP (Main Part) | MAX394EWP+ (Substitute) |
|---|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated |
| Switch Circuit | SPDT | SPDT |
| Multiplexer/Demultiplexer Circuit | 2:1 | 2:1 |
| Number of Circuits | 4 | 4 |
| On-State Resistance (Max) | 35Ohm | 35Ohm |
| Channel-to-Channel Matching (ΔRon) | 500mOhm | 500mOhm |
| Voltage - Supply, Single (V+) | 2.7V ~ 15V | 2.7V ~ 15V |
| Voltage - Supply, Dual (V±) | ±2.7V ~ 8V | ±2.7V ~ 8V |
| Switch Time (Ton, Toff) (Max) | 130ns, 75ns | 130ns, 75ns |
| Charge Injection | 5pC | 5pC |
| Channel Capacitance (CS(off), CD(off)) | 12pF, 12pF | 12pF, 12pF |
| Current - Leakage (IS(off)) (Max) | 200pA | 200pA |
| Crosstalk | -88dB @ 1MHz | -88dB @ 1MHz |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount | Surface Mount |
| Product Status | Obsolete | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| Packaging | Not specified | Tube |
Engineering Selection Recommendations
The MAX394EWP+ serves as the direct substitute for the obsolete MAX394EWP. Both parts are manufactured by Analog Devices Inc./Maxim Integrated and maintain identical electrical and mechanical specifications across all critical parameters.
The primary distinction between these parts is product lifecycle status and regulatory compliance. The MAX394EWP is classified as obsolete, while the MAX394EWP+ maintains active product status. The MAX394EWP+ achieves ROHS3 compliance, whereas the original MAX394EWP is RoHS non-compliant. Both parts carry REACH Unaffected status and EAR99 ECCN classification.
For new designs and ongoing production requiring this switch topology, the MAX394EWP+ is the appropriate selection. For legacy system maintenance where the original MAX394EWP is specified, the MAX394EWP+ provides full functional and mechanical compatibility without design modification.
Frequently Asked Questions (FAQ)
Q: Can MAX394EWP+ replace MAX394EWP in existing designs?
A: Yes. The MAX394EWP+ is electrically and mechanically identical to the MAX394EWP across all specified parameters. Both parts feature identical SPDT switch topology, 4-circuit configuration, 35Ohm on-state resistance, supply voltage ranges, switching speed, and 20-SOIC package format. Direct substitution is supported without circuit modification.
Q: What is the difference between MAX394EWP and MAX394EWP+?
A: The parts are functionally equivalent. The MAX394EWP+ differs in product status (active versus obsolete) and regulatory compliance (ROHS3 compliant versus RoHS non-compliant). The MAX394EWP+ is supplied in tube packaging, while the original part's packaging format is not specified.
Q: Are there any package or pinout differences?
A: No. Both parts use the 20-SOIC surface mount package with 0.295" width (7.50mm). Pinout and mechanical dimensions are identical, enabling direct PCB compatibility.
Q: What supply voltages do these parts support?
A: Both parts support single supply operation from 2.7V to 15V (V+) and dual supply operation from ±2.7V to ±8V (V±).
Q: What is the on-state resistance specification?
A: Maximum on-state resistance is 35Ohm with channel-to-channel matching of 500mOhm, ensuring consistent switching characteristics across all four circuits.
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