MAX334C/D Equivalent & Substitute Parts

Part Overview

The MAX334C/D is a 4-circuit IC switch with SPST-NC (Single Pole Single Throw - Normally Closed) configuration and 50Ohm on-state resistance, designed for interface applications. This part is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new designs. The die package format limits its application to hybrid and custom assembly environments.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SPST - NC
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	50Ohm
Channel-to-Channel Matching (ΔRon)	1.5Ohm (Typ)
Voltage - Supply, Single (V+)	10V ~ 30V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V
Switch Time (Ton, Toff) (Max)	120ns, 75ns
Charge Injection	10pC
Channel Capacitance (CS(off), CD(off))	10pF, 10pF
Current - Leakage (IS(off)) (Max)	1nA
Crosstalk	-86dB @ 100kHz
Operating Temperature	0°C ~ 70°C
Package / Case	Die
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MAX334C/D is determined by the following critical parameters:

Switch Circuit Type: SPST-NC configuration with 4 independent circuits
On-State Resistance: 50Ohm maximum specification
Electrical Performance: Channel-to-channel matching, switch timing, charge injection, and leakage current characteristics
Supply Voltage Compatibility: Single or dual supply operation within specified ranges
Package Compatibility: Die format for hybrid assembly applications

The MAX334EWE+ qualifies as a direct substitute based on identical switch circuit configuration, circuit count, on-state resistance, and core electrical performance parameters. The primary difference is packaging format (16-SOIC vs. Die) and expanded operating temperature range, which represents an enhancement rather than a limitation for most applications.

Parameter Comparison

Parameter	MAX334C/D (Main Part)	MAX334EWE+ (Substitute)
Switch Circuit Configuration	SPST - NC	SPST - NC
Number of Circuits	4	4
Multiplexer/Demultiplexer Circuit	1:1	1:1
On-State Resistance (Max)	50Ohm	50Ohm
Channel-to-Channel Matching (ΔRon)	1.5Ohm (Typ)	1.5Ohm
Voltage - Supply, Single (V+)	10V ~ 30V	5V ~ 30V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V	±5V ~ 15V
Switch Time (Ton, Toff) (Max)	120ns, 75ns	120ns, 75ns
Charge Injection	10pC	10pC
Channel Capacitance (CS(off), CD(off))	10pF, 10pF	10pF, 10pF
Current - Leakage (IS(off)) (Max)	1nA	1nA
Crosstalk	-86dB @ 100kHz	-86dB @ 1MHz
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C (TA)
Package / Case	Die	16-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The MAX334EWE+ is the manufacturer-recommended substitute for the MAX334C/D. Both parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring equivalent environmental and regulatory standing.

The MAX334EWE+ offers the following advantages:

Active product status with ongoing manufacturer support and availability
Expanded operating temperature range (-40°C to 85°C vs. 0°C to 70°C), providing broader environmental coverage
Improved crosstalk performance at higher frequencies (-86dB @ 1MHz vs. @ 100kHz)
Standard 16-SOIC surface mount package, eliminating die-level assembly requirements

For applications requiring die-format packaging, the MAX334C/D remains the only option within this product family. For new designs or systems transitioning from obsolete inventory, the MAX334EWE+ provides equivalent electrical performance with enhanced reliability and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can MAX334EWE+ directly replace MAX334C/D in existing designs?

A: Electrical substitution is valid based on identical switch circuit configuration, on-state resistance, and core performance parameters. However, package format differs (16-SOIC vs. Die). Designs using die-format assembly require custom integration; standard PCB designs can adopt the 16-SOIC package directly.

Q: What are the supply voltage differences between these parts?

A: MAX334C/D supports 10V ~ 30V single supply and ±4.5V ~ 20V dual supply. MAX334EWE+ supports 5V ~ 30V single supply and ±5V ~ 15V dual supply. For applications operating below 5V single supply or below ±5V dual supply, the MAX334C/D specification is required. For all other voltage ranges, both parts are compatible.

Q: Are there compliance or regulatory differences?

A: Both parts are ROHS3 compliant with MSL Level 1 rating. The MAX334EWE+ carries EAR99 ECCN classification, while the MAX334C/D is marked OBSOLETE. No functional compliance differences exist for equivalent applications.

Q: Why is crosstalk specification measured at different frequencies?

A: The crosstalk parameter is provided at different test frequencies in the datasheets. MAX334C/D specifies -86dB @ 100kHz; MAX334EWE+ specifies -86dB @ 1MHz. Both achieve the same crosstalk magnitude, with the MAX334EWE+ measurement at a higher frequency indicating maintained performance across a broader bandwidth.

Q: What is the impact of the expanded operating temperature range in MAX334EWE+?

A: The MAX334EWE+ operating range of -40°C to 85°C encompasses the MAX334C/D range of 0°C to 70°C. This expansion provides additional margin for industrial and extended-temperature applications without performance degradation within the original specification window.

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