MAX355CWE Equivalent & Substitute Parts

Part Overview

The MAX355CWE is a dual-circuit SP4T analog switch manufactured by Analog Devices Inc./Maxim Integrated, configured as a 4:1 multiplexer/demultiplexer with 350Ohm on-state resistance. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. The part is housed in a 16-SOIC surface-mount package and operates across single supply (4.5V to 36V) or dual supply (±4.5V to ±18V) configurations.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SP4T (Single Pole, 4-Throw)
Multiplexer/Demultiplexer Circuit	4:1
Number of Circuits	2
On-State Resistance (Max)	350Ohm
Channel-to-Channel Matching (ΔRon)	7Ohm
Voltage - Supply, Single (V+)	4.5V ~ 36V
Voltage - Supply, Dual (V±)	±4.5V ~ 18V
Switch Time (Ton, Toff) (Max)	250ns, 200ns
Charge Injection	80pC
Channel Capacitance (CS(off), CD(off))	1.6pF, 5pF
Current - Leakage (IS(off)) (Max)	500pA
Crosstalk	-92dB @ 100kHz
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	16-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MAX355CWE is determined by the following critical parameters:

Primary Compatibility Criteria:

Switch circuit topology: SP4T configuration with 4:1 multiplexer/demultiplexer function
Number of circuits: Dual-circuit (2 circuits minimum)
Package type: 16-SOIC surface-mount form factor
On-state resistance: Maximum 350Ohm (lower resistance values are acceptable for applications not requiring impedance matching)
Supply voltage compatibility: Dual supply operation (±4.5V minimum to ±18V maximum)
Leakage current: Maximum 500pA

Acceptable Variation Parameters:

Switch timing characteristics (Ton, Toff) within application bandwidth requirements
Channel capacitance values (higher values acceptable if crosstalk performance remains adequate)
Operating temperature range (extended ranges acceptable; narrower ranges require application verification)
RoHS and REACH compliance status (newer alternatives may have improved compliance)

The MAX355CWE+ serves as a direct functional equivalent with identical electrical specifications but improved RoHS3 compliance and active product status. The MPC509AU and MPC509AU/1K (Texas Instruments) represent alternative substitutes with higher on-state resistance (1.5kOhm) and extended operating temperature range (-40°C to 85°C), suitable for applications where impedance matching is not critical and wider temperature operation is beneficial.

Parameter Comparison

Parameter	MAX355CWE (Main)	MAX355CWE+ (Direct)	MPC509AU / MPC509AU/1K
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Texas Instruments
Switch Circuit	SP4T	SP4T	SP4T
Multiplexer/Demultiplexer Circuit	4:1	4:1	4:1
Number of Circuits	2	2	2
On-State Resistance (Max)	350Ohm	350Ohm	1.5kOhm
Channel-to-Channel Matching (ΔRon)	7Ohm	7Ohm	Not specified
Voltage - Supply, Dual (V±)	±4.5V ~ 18V	±4.5V ~ 18V	±5V ~ 22V
Switch Time (Ton, Toff) (Max)	250ns, 200ns	250ns, 200ns	200ns, 250ns (Typ)
Charge Injection	80pC	80pC	Not specified
Channel Capacitance (CS(off), CD(off))	1.6pF, 5pF	1.6pF, 5pF	5pF, 12pF
Current - Leakage (IS(off)) (Max)	500pA	500pA	500pA (Typ)
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)
Package / Case	16-SOIC	16-SOIC	16-SOIC
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MAX355CWE+ (Direct Equivalent): Select this part for applications requiring identical electrical performance to the original MAX355CWE. The MAX355CWE+ maintains 350Ohm on-state resistance and 7Ohm channel-to-channel matching, ensuring no circuit redesign is necessary. This part is active in production and carries ROHS3 compliance, making it suitable for new designs and ongoing production. Packaging is available in Tube format.

MPC509AU / MPC509AU/1K (Alternative Substitute): These Texas Instruments parts are suitable for applications where on-state resistance of 1.5kOhm is acceptable and extended operating temperature range (-40°C to 85°C) is required. The higher on-state resistance may introduce additional signal attenuation in low-impedance circuits. These parts are active in production with ROHS3 compliance. MPC509AU is supplied in Tube packaging; MPC509AU/1K is supplied in Tape & Reel format. The extended temperature range supports industrial and automotive applications beyond the original MAX355CWE specification.

Frequently Asked Questions (FAQ)

Q: Can MAX355CWE+ be used as a direct replacement for MAX355CWE? A: Yes. The MAX355CWE+ is electrically identical to the MAX355CWE with identical on-state resistance (350Ohm), channel matching (7Ohm), supply voltage ranges, and switching characteristics. The primary difference is improved RoHS3 compliance and active product status. No circuit modifications are required.

Q: What is the key difference between MAX355CWE+ and MPC509AU? A: The primary difference is on-state resistance: MAX355CWE+ specifies 350Ohm maximum, while MPC509AU specifies 1.5kOhm maximum. This 4.3x increase in resistance may cause signal attenuation in applications with low source impedance or high-frequency signals. MPC509AU offers extended operating temperature (-40°C to 85°C versus 0°C to 70°C) and higher supply voltage range (±5V to ±22V versus ±4.5V to ±18V).

Q: Are the 16-SOIC packages physically identical? A: Yes. All three parts (MAX355CWE+, MPC509AU, MPC509AU/1K) use the same 16-SOIC package (0.295", 7.50mm width). PCB footprints are compatible without modification.

Q: Which substitute should I select for a new design? A: For new designs, MAX355CWE+ is recommended as the primary choice due to identical electrical specifications and active production status. If extended temperature operation (-40°C to 85°C) is required and higher on-state resistance is acceptable, MPC509AU or MPC509AU/1K are viable alternatives.

Q: What is the difference between MPC509AU and MPC509AU/1K? A: Both parts are electrically identical. The difference is packaging format: MPC509AU is supplied in Tube; MPC509AU/1K is supplied in Tape & Reel (TR). Tape & Reel format is typically used for high-volume automated assembly. Select based on your procurement and assembly process requirements.

Q: Can I use MPC509AU in place of MAX355CWE+ in a precision signal routing application? A: Application-dependent. The 1.5kOhm on-state resistance of MPC509AU versus 350Ohm of MAX355CWE+ will introduce 4.3x greater signal attenuation and impedance mismatch. This is acceptable for high-impedance circuits but may degrade performance in low-impedance or high-frequency applications. Circuit simulation or testing is necessary to confirm compatibility.

Q: What is the inventory status of these parts? A: MAX355CWE+ has 2000 units in stock; MPC509AU has 6101 units; MPC509AU/1K has 1981 units. The original MAX355CWE (obsolete) has 25400 units remaining in inventory.

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