MAX4643EUA Equivalent & Substitute Parts

Part Overview

The MAX4643EUA is a 2-circuit IC switch with SPST (Single Pole Single Throw) NO/NC configuration, manufactured by Analog Devices Inc./Maxim Integrated. This component operates as a 1:1 multiplexer/demultiplexer with 4Ohm on-state resistance and is housed in an 8-uMAX/uSOP surface mount package. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO/NC
Number of Circuits	2
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	4Ohm
Channel-to-Channel Matching (ΔRon)	200mOhm
Supply Voltage Range (V+)	1.8V ~ 5.5V
Switch Time (Ton/Toff Max)	15ns / 8ns
Charge Injection	2pC
Channel Capacitance (CS(off) / CD(off))	7pF / 7pF
Leakage Current (IS(off) Max)	250pA
Crosstalk @ 1MHz	-97dB
Operating Temperature Range	-40°C ~ 85°C
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MAX4643EUA is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Switch circuit type: SPST - NO/NC configuration
Circuit count: 2 circuits minimum
Multiplexer configuration: 1:1
On-state resistance: 4Ohm (maximum allowable)
Supply voltage compatibility: 1.8V ~ 5.5V range
Package compatibility: 8-TSSOP or 8-MSOP form factor
Surface mount mounting type

Substitution Groups:

Group 1 - Direct Equivalent (Same Base Product): MAX4643EUA+ represents the active production variant of the MAX4643 base product with identical electrical specifications and RoHS3 compliance.

Group 2 - Functional Equivalent (ADG723 Series): ADG723BRMZ, ADG723BRMZ-REEL, and ADG723BRMZ-REEL7 meet all primary substitution criteria with 4Ohm on-state resistance. Channel-to-channel matching is 300mOhm (versus 200mOhm in MAX4643EUA), and switch times are 14ns/6ns (typical). These parts feature 200MHz -3dB bandwidth and are available in active production status with RoHS3 compliance.

Group 3 - Higher Resistance Alternative (ADG823 Series): ADG823BRMZ and ADG823BRMZ-REEL7 provide 600mOhm on-state resistance, which exceeds the 4Ohm specification of the original part. These are suitable only when higher on-state resistance is acceptable in the application. Operating temperature extends to 125°C. These parts are active and RoHS3 compliant.

Group 4 - Alternative Manufacturer (Vishay Siliconix): DG9234EDQ-T1-GE3 offers 25Ohm on-state resistance with different electrical characteristics including lower leakage current (100pA) and superior crosstalk performance (-108dB @ 1MHz). Supply voltage range is 2.7V ~ 5.5V. This part is active and RoHS3 compliant.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	ΔRon (Max)	Ton/Toff (Max)	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
MAX4643EUA	Analog Devices/Maxim	4Ohm	200mOhm	15ns / 8ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-uMAX/uSOP	Obsolete	RoHS non-compliant
MAX4643EUA+	Analog Devices/Maxim	4Ohm	200mOhm	15ns / 8ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active	RoHS3 Compliant
ADG723BRMZ	Analog Devices	4Ohm	300mOhm	14ns / 6ns (Typ)	1.8V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active	RoHS3 Compliant
ADG723BRMZ-REEL	Analog Devices	4Ohm	300mOhm	14ns / 6ns (Typ)	1.8V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active	RoHS3 Compliant
ADG723BRMZ-REEL7	Analog Devices	4Ohm	300mOhm	14ns / 6ns (Typ)	1.8V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active	RoHS3 Compliant
ADG823BRMZ	Analog Devices	600mOhm	160mOhm	45ns / 16ns	1.8V ~ 5.5V	-40°C ~ 125°C	8-MSOP	Active	RoHS3 Compliant
ADG823BRMZ-REEL7	Analog Devices	600mOhm	160mOhm	45ns / 16ns	1.8V ~ 5.5V	-40°C ~ 125°C	8-MSOP	Active	RoHS3 Compliant
DG9234EDQ-T1-GE3	Vishay Siliconix	25Ohm	400mOhm	75ns / 50ns	2.7V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active	RoHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Recommended Primary Choice): MAX4643EUA+ is the active production equivalent with identical electrical specifications and improved RoHS3 compliance status. This part maintains the 4Ohm on-state resistance and 200mOhm channel matching of the original obsolete part while offering superior supply chain availability and regulatory compliance.

For New Designs with Enhanced Performance: ADG723BRMZ, ADG723BRMZ-REEL, or ADG723BRMZ-REEL7 provide equivalent 4Ohm on-state resistance with faster switching times (14ns/6ns typical versus 15ns/8ns maximum) and 200MHz bandwidth capability. All variants are in active production with RoHS3 compliance. Selection between tube (BRMZ) and reel packaging (REEL, REEL7) depends on procurement volume and assembly requirements.

For Extended Temperature Applications: ADG823BRMZ or ADG823BRMZ-REEL7 extend operating temperature to 125°C but introduce 600mOhm on-state resistance. These parts are suitable only when the application tolerates higher resistance and the extended temperature range is required. Both are active and RoHS3 compliant.

For Alternative Manufacturer Sourcing: DG9234EDQ-T1-GE3 (Vishay Siliconix) offers a different electrical profile with 25Ohm on-state resistance, lower leakage current (100pA), and superior crosstalk performance (-108dB @ 1MHz). Minimum supply voltage is 2.7V (versus 1.8V for Analog Devices parts). This part is active and RoHS3 compliant but requires application-level verification of the higher on-state resistance.

Frequently Asked Questions (FAQ)

Q: Can MAX4643EUA+ be used as a direct replacement for MAX4643EUA? A: Yes. MAX4643EUA+ is the active production variant of the same base product with identical electrical specifications. The primary difference is RoHS3 compliance status and packaging format (Tube versus original specification). Electrical performance and pin compatibility are equivalent.

Q: What is the key difference between ADG723BRMZ variants (REEL, REEL7)? A: All ADG723BRMZ variants share identical electrical specifications. The suffix indicates packaging format: BRMZ is tube packaging, REEL is standard cut tape with Digi-Reel, and REEL7 is cut tape with Digi-Reel in a 7-inch reel format. Selection depends on procurement volume and assembly line requirements.

Q: Can ADG823BRMZ be used in place of MAX4643EUA? A: ADG823BRMZ meets the SPST-NO/NC, 2-circuit, 1:1 configuration and package requirements. However, on-state resistance is 600mOhm versus 4Ohm in the original part. Substitution is valid only if the application circuit tolerates the higher resistance. Extended operating temperature to 125°C is an additional benefit.

Q: Why does DG9234EDQ-T1-GE3 have a higher on-state resistance (25Ohm)? A: DG9234EDQ-T1-GE3 is manufactured by Vishay Siliconix using different semiconductor technology. The 25Ohm on-state resistance reflects this design approach. This part is suitable only when the application circuit design accommodates higher switch resistance. Advantages include lower leakage current and superior crosstalk performance.

Q: What is the minimum supply voltage for each substitute? A: MAX4643EUA, MAX4643EUA+, ADG723 series, and ADG823 series support 1.8V minimum supply voltage. DG9234EDQ-T1-GE3 requires minimum 2.7V supply voltage. Verify application supply voltage compatibility before selection.

Q: Are all substitute parts RoHS3 compliant? A: MAX4643EUA+ (Active), ADG723BRMZ, ADG723BRMZ-REEL, ADG723BRMZ-REEL7, ADG823BRMZ, ADG823BRMZ-REEL7, and DG9234EDQ-T1-GE3 are all RoHS3 compliant. The original MAX4643EUA is RoHS non-compliant. For new designs and regulated applications, select from the RoHS3 compliant alternatives.

Q: What is the package compatibility between MAX4643EUA and substitutes? A: MAX4643EUA uses 8-uMAX/uSOP package. All substitute parts use 8-TSSOP or 8-MSOP package format with identical 0.118" (3.00mm) width. Pin compatibility and footprint are equivalent, allowing direct PCB substitution.

Q: Which substitute offers the fastest switching performance? A: ADG723BRMZ, ADG723BRMZ-REEL, and ADG723BRMZ-REEL7 provide the fastest switching times at 14ns turn-on and 6ns turn-off (typical). These are faster than the original MAX4643EUA specification of 15ns/8ns maximum.

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