MAX4594EXK-T Equivalent & Substitute Parts

Part Overview

The MAX4594EXK-T is a single-pole single-throw (SPST) normally-open IC switch manufactured by Analog Devices Inc./Maxim Integrated, housed in a 5-TSSOP (SC-70-5) package. This component features a 10Ω on-state resistance, operates across a 2V to 5.5V supply range, and delivers 300MHz bandwidth with 35ns/40ns switching times. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO (Single-Pole Single-Throw Normally-Open)
Multiplexer/Demultiplexer Configuration	1:1
Number of Circuits	1
On-State Resistance (Max)	10Ω
Supply Voltage Range (Single)	2V ~ 5.5V
Switch Time (Ton/Toff Max)	35ns / 40ns
-3dB Bandwidth	300MHz
Charge Injection	2pC
Channel Capacitance (CS(off)/CD(off))	8pF / 8pF
Leakage Current (IS(off) Max)	500pA
Operating Temperature Range	-40°C ~ 85°C
Package Type	5-TSSOP, SC-70-5, SOT-353
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX4594EXK-T is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Switch circuit type: SPST - NO configuration
Multiplexer/demultiplexer ratio: 1:1
Number of circuits: 1
Package compatibility: 5-TSSOP, SC-70-5, SOT-353 form factors
Supply voltage range: Minimum 2V to 5.5V operation
Operating temperature: -40°C to 85°C minimum

Secondary Compatibility Parameters:

On-state resistance: 10Ω nominal (tolerance variations acceptable within application requirements)
Switch timing: 35ns/40ns maximum (faster switching acceptable)
Bandwidth: 300MHz minimum
Leakage current: 500pA maximum
Charge injection: 2pC nominal

Substitute parts are grouped into three categories based on electrical performance alignment and product status:

Category 1 - Parametric Equivalents (Identical Electrical Specifications): MAX4594EXK+T and MAX4596EXK+T maintain all critical electrical parameters while offering active product status and improved RoHS compliance.

Category 2 - Direct Substitutes (Equivalent Performance, Different Manufacturer): MAX4596DCKR and TS5A4594DCKR provide functionally equivalent switching performance with minor parameter variations (on-state resistance 8Ω to 10Ω, switching times 17ns/14ns to 35ns/40ns) while maintaining package compatibility and active status.

Category 3 - Functional Alternatives (Different Electrical Characteristics): 74AHC1G66GW-Q100H, 74HCT1G66GW-Q100H, ADG741BKSZ5-REEL7, ISL43L110IHZ-T, and MAX4594DBVR offer SPST-NO switching functionality with variations in on-state resistance (3Ω to 95Ω), bandwidth (200MHz to 450MHz), and package options (SOT-23-5 for MAX4594DBVR).

Parameter Comparison

Part Number	Manufacturer	Product Status	Ron (Max)	V+ Range	Ton/Toff (Max)	Bandwidth	Package	RoHS Status
MAX4594EXK-T	Analog Devices	Obsolete	10Ω	2V ~ 5.5V	35ns / 40ns	300MHz	SC-70-5	Non-compliant
MAX4594EXK+T	Analog Devices	Active	10Ω	2V ~ 5.5V	35ns / 40ns	300MHz	SC-70-5	ROHS3 Compliant
MAX4596EXK+T	Analog Devices	Active	10Ω	2V ~ 5.5V	35ns / 40ns	300MHz	SC-70-5	ROHS3 Compliant
MAX4596DCKR	Texas Instruments	Active	10Ω	2.4V ~ 5.5V	35ns / 40ns	300MHz	SC-70-5	ROHS3 Compliant
TS5A4594DCKR	Texas Instruments	Active	8Ω	2V ~ 5.5V	17ns / 14ns	450MHz	SC-70-5	ROHS3 Compliant
74AHC1G66GW-Q100H	Nexperia USA Inc.	Active	22Ω	2V ~ 5.5V	11ns / 11ns	280MHz	5-TSSOP	ROHS3 Compliant
74HCT1G66GW-Q100H	Nexperia USA Inc.	Active	95Ω	4.5V ~ 5.5V	30ns / 44ns	200MHz	5-TSSOP	ROHS3 Compliant
ADG741BKSZ5-REEL7	Analog Devices	Active	3Ω	1.8V ~ 5.5V	12ns / 8ns	200MHz	SC-70-5	ROHS3 Compliant
ISL43L110IHZ-T	Renesas Electronics	Active	220mΩ (Typ)	1.1V ~ 4.5V	15ns / 10ns	—	SC-70-5	ROHS3 Compliant
MAX4594DBVR	Texas Instruments	Active	10Ω	2.4V ~ 5.5V	35ns / 40ns	300MHz	SOT-23-5	ROHS3 Compliant
MAX4594DCKR	Texas Instruments	Active	10Ω	2.4V ~ 5.5V	35ns / 40ns	300MHz	SC-70-5	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

MAX4594EXK+T and MAX4594DCKR are the primary recommendations for direct substitution. Both maintain the 10Ω on-state resistance, 2V to 5.5V supply range, 35ns/40ns switching times, and 300MHz bandwidth of the original MAX4594EXK-T. Both parts carry active product status and ROHS3 compliance, eliminating obsolescence risk and meeting modern environmental standards. MAX4594EXK+T is supplied in tape and reel packaging, while MAX4594DCKR is available in cut tape format.

For Enhanced Performance Requirements:

TS5A4594DCKR offers superior switching performance with 8Ω on-state resistance, faster switching times (17ns/14ns), and extended 450MHz bandwidth. This part is suitable for applications requiring reduced insertion loss and higher frequency operation while maintaining the 2V to 5.5V supply compatibility and SC-70-5 package form factor.

For Automotive and Extended Temperature Applications:

74AHC1G66GW-Q100H provides automotive-grade qualification (AEC-Q100) with extended operating temperature to 125°C. While on-state resistance increases to 22Ω and bandwidth reduces to 280MHz, this part maintains 2V to 5.5V supply compatibility and 5-TSSOP package compatibility. Selection is appropriate for automotive designs where the higher on-state resistance is acceptable.

For Low-Voltage Applications:

ADG741BKSZ5-REEL7 extends supply voltage range to 1.8V minimum, enabling operation in low-power systems. This part features superior 3Ω on-state resistance and faster switching (12ns/8ns typical), though bandwidth is limited to 200MHz. ISL43L110IHZ-T operates from 1.1V, offering the lowest on-state resistance (220mΩ typical) for ultra-low-power applications, though supply range is limited to 4.5V maximum.

For Alternative Package Requirements:

MAX4594DBVR provides identical electrical specifications to MAX4594DCKR in SOT-23-5 package format, enabling board layout flexibility where SC-70-5 footprints are unavailable.

Compliance Considerations:

All recommended substitutes carry ROHS3 compliance and MSL-1 moisture sensitivity ratings, eliminating the RoHS non-compliance limitation of the original MAX4594EXK-T. All parts maintain EAR99 export classification and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can MAX4594DCKR directly replace MAX4594EXK-T in existing designs?

A: Yes. MAX4594DCKR maintains identical electrical specifications: 10Ω on-state resistance, 2V to 5.5V supply range, 35ns/40ns switching times, and 300MHz bandwidth. The SC-70-5 package footprint is identical. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Minimum supply voltage is 2.4V for MAX4594DCKR versus 2V for MAX4594EXK-T; verify your application's minimum supply voltage requirement.

Q: What is the difference between MAX4594EXK+T and MAX4594DCKR?

A: Both parts are electrically identical with matching specifications. MAX4594EXK+T is supplied by Analog Devices in tape and reel packaging, while MAX4594DCKR is supplied by Texas Instruments in cut tape format. Selection depends on packaging preference and supplier availability. Both carry active product status and ROHS3 compliance.

Q: Is TS5A4594DCKR a suitable replacement if my application requires faster switching?

A: TS5A4594DCKR is suitable if your circuit can tolerate 8Ω on-state resistance instead of 10Ω. This part delivers faster switching (17ns/14ns vs. 35ns/40ns) and higher bandwidth (450MHz vs. 300MHz). Supply voltage range remains 2V to 5.5V, and SC-70-5 package is identical. Verify that the lower on-state resistance does not introduce signal integrity issues in your specific application.

Q: Can 74AHC1G66GW-Q100H be used in non-automotive applications?

A: Yes. 74AHC1G66GW-Q100H is a general-purpose SPST-NO switch with automotive qualification. It is suitable for any application where 22Ω on-state resistance, 280MHz bandwidth, and extended temperature operation (-40°C to 125°C) are acceptable. The higher on-state resistance may increase insertion loss in high-frequency or low-impedance circuits compared to the original 10Ω specification.

Q: What is the minimum supply voltage for each substitute part?

A: MAX4594EXK+T, TS5A4594DCKR, and 74AHC1G66GW-Q100H operate from 2V minimum. MAX4596DCKR and MAX4594DCKR require 2.4V minimum. 74HCT1G66GW-Q100H requires 4.5V minimum. ADG741BKSZ5-REEL7 operates from 1.8V minimum. ISL43L110IHZ-T operates from 1.1V minimum. Verify your application's minimum supply voltage against the selected substitute.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitutes carry ROHS3 compliance. The original MAX4594EXK-T is RoHS non-compliant. If your application or supply chain requires RoHS compliance, any of the listed substitutes satisfy this requirement.

Q: What is the package compatibility for board layout?

A: MAX4594EXK-T, MAX4594EXK+T, MAX4596EXK+T, MAX4596DCKR, TS5A4594DCKR, 74AHC1G66GW-Q100H, 74HCT1G66GW-Q100H, ADG741BKSZ5-REEL7, ISL43L110IHZ-T, and MAX4594DCKR all use 5-TSSOP, SC-70-5, or SOT-353 packages with identical footprints. MAX4594DBVR uses SOT-23-5 package, which requires a different PCB footprint. Verify your board layout supports the selected package type.

Q: Which substitute offers the lowest on-state resistance?

A: ISL43L110IHZ-T offers the lowest on-state resistance at 220mΩ typical. ADG741BKSZ5-REEL7 provides 3Ω on-state resistance. Both parts are suitable for applications requiring minimal insertion loss. ISL43L110IHZ-T operates from 1.1V to 4.5V, while ADG741BKSZ5-REEL7 operates from 1.8V to 5.5V.

Q: Can I use 74HCT1G66GW-Q100H as a general replacement?

A: 74HCT1G66GW-Q100H is not recommended as a general replacement due to its 95Ω on-state resistance and 4.5V minimum supply voltage. This part is suitable only for applications where higher on-state resistance is acceptable and supply voltage remains above 4.5V. The 200MHz bandwidth is also lower than the original 300MHz specification.

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