MAX4729EXT+ Equivalent & Substitute Parts

Part Overview

The MAX4729EXT+ is a single-circuit SPDT (Single-Pole Double-Throw) analog switch manufactured by Analog Devices Inc./Maxim Integrated. This interface component operates as a 2:1 multiplexer/demultiplexer with an on-state resistance of 5.5Ohm maximum and supports supply voltages from 1.8V to 5.5V. The device is housed in a 6-pin SC-70 (SOT-363) surface-mount package and is classified as Active product status with full RoHS3 compliance.

Equivalent and substitute parts are necessary when the MAX4729EXT+ reaches end-of-life status, when inventory constraints occur, or when design requirements necessitate alternative electrical characteristics such as lower on-state resistance, improved switching speed, or different leakage current specifications.

Key Parameters

Parameter	Value	Unit
Switch Circuit Type	SPDT	—
Multiplexer/Demultiplexer Configuration	2:1	—
Number of Circuits	1	—
On-State Resistance (Max)	5.5	Ohm
Channel-to-Channel Matching (ΔRon)	50	mOhm
Supply Voltage Range (Single)	1.8 to 5.5	V
Switch Time (Ton, Toff) Max	45, 26	ns
-3dB Bandwidth	300	MHz
Charge Injection	3	pC
Channel Capacitance (CS(off), CD(off))	6.5	pF
Leakage Current (IS(off)) Max	2	nA
Crosstalk @ 1MHz	-67	dB
Operating Temperature Range	-40 to 85	°C
Package Type	6-TSSOP, SC-88, SOT-363	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MAX4729EXT+ is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Switch circuit type must be SPDT
Multiplexer/demultiplexer configuration must be 2:1
Number of circuits must be 1
Package type must be compatible: 6-TSSOP, SC-88, or SOT-363
Mounting type must be Surface Mount
Operating temperature range must encompass -40°C to 85°C
Supply voltage range must support the application requirements
RoHS3 compliance and MSL 1 rating required

Secondary Electrical Parameters for Compatibility Assessment:

On-state resistance (Ron): Determines signal attenuation and power dissipation
Channel-to-channel matching (ΔRon): Affects signal uniformity across channels
Switch time (Ton, Toff): Determines switching speed capability
Bandwidth: Defines frequency response limitations
Leakage current: Affects signal integrity in high-impedance applications
Crosstalk: Determines isolation between switch paths

Substitute parts are grouped based on whether they maintain compatibility with the core functional requirements while offering variations in performance characteristics. Parts with lower on-state resistance provide improved signal integrity but may have different leakage or capacitance profiles. Parts with faster switching times enable higher-frequency applications.

Parameter Comparison

Parameter	MAX4729EXT+	TS5A9411DCKR	TS5A4624DCKR	FSA4157AP6X	NC7SB3157P6X	PI5A4599BCEX
Manufacturer	Analog Devices	Texas Instruments	Texas Instruments	onsemi	onsemi	Diodes Inc.
Switch Circuit	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Multiplexer Config	2:1	2:1	2:1	2:1	2:1	2:1
Number of Circuits	1	1	1	1	1	1
On-State Resistance (Max) [Ohm]	5.5	9	0.9	1.15	15	11
ΔRon [mOhm]	50	30	50	60	150	150
Supply Voltage Range [V]	1.8 to 5.5	2.25 to 5.5	1.65 to 5.5	2.7 to 5.5	1.65 to 5.5	1.6 to 6.0
Ton, Toff (Max) [ns]	45, 26	9, 7	22, 8	35, 15	5.2, 3.5	15, 7
-3dB Bandwidth [MHz]	300	100	90	300	250	350
Charge Injection [pC]	3	12.5	15.5	20	7	5
Channel Capacitance [pF]	6.5	3.5	18	12	6.5	2.5
Leakage Current (Max) [nA]	2	0.5	20	2	100	100
Crosstalk @ 1MHz [dB]	-67	-85	-63	-70	-54	-82
Operating Temperature [°C]	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Package Type	SC-70-6	SC-70-6	SC-70-6	SC-88	SC-88	SOT-363-6
Product Status	Active	Last Time Buy	Active	Active	Active	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Active Product Status Substitutes:

The following parts maintain Active product status and are recommended for new designs and long-term availability:

TS5A9411DCKR (Texas Instruments): Offers superior leakage current performance (0.5nA) and excellent crosstalk isolation (-85dB @ 1MHz). Supply voltage range begins at 2.25V, which is higher than the MAX4729EXT+. Suitable for low-power, high-frequency applications requiring minimal signal degradation.
TS5A4624DCKR (Texas Instruments): Provides the lowest on-state resistance (0.9Ohm) among substitutes, minimizing signal attenuation and power dissipation. Supports extended supply voltage range (1.65V to 5.5V). Appropriate for applications requiring minimal insertion loss.
FSA4157AP6X (onsemi): Combines low on-state resistance (1.15Ohm) with fast switching times (35ns, 15ns) and maintains 300MHz bandwidth. Supply voltage range starts at 2.7V. Suitable for general-purpose switching applications with moderate performance requirements.
NC7SB3157P6X (onsemi): Offers the fastest switching times (5.2ns, 7ns) and lowest channel-to-channel matching variation (150mOhm). Supports the widest supply voltage range (1.65V to 5.5V). Recommended for high-speed switching applications where transition time is critical.

Last Time Buy Product Status Substitutes:

TS5A4624DCKT (Texas Instruments): Identical electrical specifications to TS5A4624DCKR with Last Time Buy status. Inventory availability is limited (2,388 pcs).
TS5A9411DCKT (Texas Instruments): Identical electrical specifications to TS5A9411DCKR with Last Time Buy status. Inventory availability is limited (17,100 pcs).
PI5A4599BCEX (Diodes Incorporated): Offers the lowest channel capacitance (2.5pF) and excellent crosstalk performance (-82dB @ 1MHz). Supports extended supply voltage range (1.6V to 6.0V). Last Time Buy status with limited inventory (6,883 pcs).

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the MAX4729EXT+ environmental specifications. All parts are classified under ECCN EAR99 and HTSUS 8542.39.0001, ensuring regulatory consistency.

Frequently Asked Questions (FAQ)

Q: Can TS5A4624DCKR replace MAX4729EXT+ in all applications?

A: TS5A4624DCKR is electrically compatible as a direct substitute. However, the on-state resistance is significantly lower (0.9Ohm vs. 5.5Ohm), which reduces signal attenuation. The supply voltage range (1.65V to 5.5V) is wider than MAX4729EXT+ (1.8V to 5.5V), making it suitable for lower-voltage applications. Verify that the lower insertion loss does not affect circuit biasing or signal conditioning requirements.

Q: What is the difference between TS5A9411DCKR and TS5A9411DCKT?

A: Both parts are electrically identical with the same specifications. The difference is packaging: DCKR is supplied in Cut Tape (CT) & Digi-Reel format with 215,400 pcs inventory (Active status), while DCKT is supplied in Tape & Reel (TR) format with 17,100 pcs inventory (Last Time Buy status). Select based on packaging requirements and inventory availability.

Q: Is NC7SB3157P6X suitable for low-voltage applications?

A: Yes. NC7SB3157P6X supports supply voltage from 1.65V to 5.5V, which is lower than MAX4729EXT+ (1.8V to 5.5V). However, the on-state resistance is higher (15Ohm vs. 5.5Ohm), resulting in greater signal attenuation. This part is recommended for applications where switching speed is prioritized over insertion loss.

Q: What are the package compatibility considerations?

A: MAX4729EXT+ uses SC-70-6 package. Substitute parts use SC-70-6, SC-88, or SOT-363 packages. SC-70-6 and SOT-363 are physically equivalent (both are 6-pin packages with identical pinout). SC-88 is also a 6-pin package with compatible pinout. Verify PCB footprint compatibility before substitution. All packages are surface-mount types.

Q: Which substitute offers the best leakage current performance?

A: TS5A9411DCKR provides the lowest leakage current at 0.5nA (typical), compared to MAX4729EXT+ at 2nA. This is beneficial for high-impedance signal paths where leakage current can introduce noise or signal degradation. NC7SB3157P6X and PI5A4599BCEX have higher leakage (100nA), which may be unsuitable for sensitive analog applications.

Q: Can PI5A4599BCEX be used as a long-term replacement?

A: PI5A4599BCEX is classified as Last Time Buy, indicating limited future availability. While it offers excellent crosstalk performance (-82dB @ 1MHz) and the lowest channel capacitance (2.5pF), it is not recommended for new designs requiring long-term supply assurance. Use Active status parts (TS5A9411DCKR, TS5A4624DCKR, FSA4157AP6X, NC7SB3157P6X) for designs requiring extended product lifecycle.

Q: What is the significance of channel-to-channel matching (ΔRon)?

A: Channel-to-channel matching indicates the resistance variation between the two switch paths. MAX4729EXT+ has ΔRon of 50mOhm, meaning the two channels differ by up to 50mOhm. Lower values (TS5A9411DCKR at 30mOhm) provide better uniformity between channels, reducing signal distortion in multiplexed applications. Higher values (NC7SB3157P6X and PI5A4599BCEX at 150mOhm) may introduce channel-dependent signal variations.

Q: How does bandwidth affect substitution suitability?

A: MAX4729EXT+ has -3dB bandwidth of 300MHz. Substitutes range from 90MHz (TS5A4624DCKR) to 350MHz (PI5A4599BCEX). For applications operating below 90MHz, any substitute is acceptable. For applications requiring 300MHz or higher, select TS5A9411DCKR (100MHz), FSA4157AP6X (300MHz), NC7SB3157P6X (250MHz), or PI5A4599BCEX (350MHz). TS5A4624DCKR is unsuitable for high-frequency applications.

Q: What is charge injection and why does it matter?

A: Charge injection is the amount of charge transferred to the signal path when the switch transitions. MAX4729EXT+ has 3pC charge injection. Lower values (PI5A4599BCEX at 5pC, NC7SB3157P6X at 7pC) reduce signal distortion during switching. Higher values (TS5A4624DCKR at 15.5pC, FSA4157AP6X at 20pC) may introduce transient errors in precision analog applications. Select based on signal conditioning requirements.

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