MAX381CPE+ Equivalent & Substitute Parts

Part Overview

The MAX381CPE+ is a 2-circuit SPST-NO (Single Pole Single Throw - Normally Open) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated. This component functions as a precision electronic switch with 35Ohm on-state resistance, designed for signal routing and multiplexing applications in analog systems. The device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement continuity.

Substiute Parts

MAX381CPE+

Analog Devices Inc./Maxim IntegratedIn Stock: 1144MAX381CPE+ Datasheet

Current PartRFQ

MAX381CPE+

Analog Devices Inc./Maxim IntegratedIn Stock: 1144MAX381CPE+ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX381CPE+ is determined by strict electrical and mechanical parameter matching within the analog switch IC category. The critical parameters that define substitution eligibility are:

• Switch circuit topology: SPST - NO configuration
• Circuit count: 2 independent circuits
• Multiplexer ratio: 1:1 switching architecture
• On-state resistance: Maximum 35Ohm
• Channel-to-channel matching: ΔRon ≤ 500mOhm
• Supply voltage compatibility: Single supply 3V ~ 15V or dual supply ±3V ~ 8V
• Switching speed: Ton ≤ 175ns, Toff ≤ 100ns
• Charge injection: ≤ 2pC
• Channel capacitance: CS(off) and CD(off) ≤ 12pF each
• Leakage current: IS(off) ≤ 200pA
• Crosstalk performance: ≥ -90dB @ 1MHz
• Package: 16-DIP through-hole form factor
• Operating temperature range: 0°C ~ 70°C minimum
• Compliance: ROHS3 and REACH requirements

Parameter Comparison

Engineering Selection Recommendations

The MAX381CPE+ is an obsolete component. Selection of equivalent parts must be based on exact parameter matching across all electrical and mechanical specifications. The substitute identified maintains full compliance with ROHS3 and REACH requirements, ensuring regulatory conformance for new designs and legacy system support.

When selecting alternatives, verify that the replacement part maintains the 16-DIP through-hole package format for direct PCB compatibility. Confirm that supply voltage requirements align with existing system architecture, whether single-supply (3V ~ 15V) or dual-supply (±3V ~ 8V) configurations are implemented.

The on-state resistance of 35Ohm and channel-to-channel matching specification of 500mOhm are critical for signal integrity in multiplexing applications. Switching speed parameters (Ton = 175ns maximum, Toff = 100ns maximum) and charge injection characteristics (2pC) must be maintained to preserve system timing and signal fidelity.

Frequently Asked Questions (FAQ)

Q: Why is the MAX381CPE+ listed as obsolete? A: The MAX381CPE+ is classified as obsolete by the manufacturer. This designation indicates that the component is no longer in active production, though existing inventory may remain available through authorized distributors.

Q: What defines a valid substitute for the MAX381CPE+? A: A valid substitute must match all specified electrical parameters including switch circuit type (SPST-NO), circuit count (2), on-state resistance (35Ohm maximum), supply voltage ranges, switching speed, charge injection, and leakage current specifications. The package format must remain 16-DIP through-hole to ensure PCB compatibility without redesign.

Q: Can I use a different package variant of the MAX381? A: Package substitution is not permitted without PCB redesign. The MAX381CPE+ is specified in 16-DIP through-hole format. Alternative package types (such as surface-mount variants) require circuit board layout modifications and are outside the scope of direct component substitution.

Q: What is the significance of the 500mOhm channel-to-channel matching specification? A: Channel-to-channel matching (ΔRon) of 500mOhm specifies the maximum resistance variation between the two independent switch circuits within a single IC. This parameter is critical in applications requiring balanced signal routing or multiplexing where resistance uniformity affects signal quality and system performance.

Q: Are there supply voltage flexibility considerations for substitution? A: The MAX381CPE+ supports both single-supply operation (3V ~ 15V) and dual-supply operation (±3V ~ 8V). Substitute parts must support the same voltage configuration used in the target application. Verify that the system power architecture matches the selected component's supply requirements.

Q: What does the -90dB crosstalk specification mean? A: Crosstalk of -90dB @ 1MHz indicates the level of signal coupling between the two independent switch circuits at 1 megahertz. This specification ensures that switching activity in one circuit does not introduce significant interference into the other circuit, maintaining signal isolation in multiplexing applications.

Q: Is the 16-DIP package still widely supported? A: The 16-DIP through-hole package remains available from multiple manufacturers for various analog switch ICs. However, availability of the specific MAX381CPE+ part number is limited due to its obsolete status. Equivalent parts with identical electrical specifications and package format should be evaluated based on current distributor inventory and lead times.