MAX309CSE Equivalent & Substitute Parts

Part Overview

The MAX309CSE is a 2-circuit SP4T analog switch IC with 100Ohm on-state resistance, manufactured by Analog Devices Inc./Maxim Integrated in 16-SOIC surface mount packaging. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and production continuity. The MAX309CSE operates across a wide supply voltage range (5V to 30V single supply, or ±5V to ±20V dual supply) and is suitable for audio, instrumentation, and general-purpose switching applications requiring low on-state resistance and minimal crosstalk.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SP4T (Single Pole, 4-Throw)
Number of Circuits	2
Multiplexer/Demultiplexer Circuit	4:1
On-State Resistance (Max)	100Ohm
Channel-to-Channel Matching (ΔRon)	1.5Ohm
Voltage - Supply, Single (V+)	5V ~ 30V
Voltage - Supply, Dual (V±)	±5V ~ 20V
Switch Time (Ton, Toff) (Max)	150ns, 150ns
Charge Injection	2pC
Channel Capacitance (CS(off), CD(off))	3pF, 26pF
Current - Leakage (IS(off)) (Max)	750pA
Crosstalk	-92dB @ 100kHz
Operating Temperature	0°C ~ 70°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MAX309CSE is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Switch circuit configuration: SP4T with 2 circuits, 4:1 multiplexer/demultiplexer
On-state resistance: 100Ohm maximum (allows parts with equal or lower resistance)
Package type: 16-SOIC surface mount
Supply voltage compatibility: Must support the application's required voltage range
Channel-to-channel matching: ΔRon ≤ 1.5Ohm for direct replacement; higher values acceptable for less demanding applications
Operating temperature range: Must encompass or exceed the application requirement

Secondary Compatibility Parameters:

Charge injection, channel capacitance, leakage current, and crosstalk specifications must be evaluated against application-specific signal integrity requirements
RoHS compliance status and product lifecycle status (active vs. obsolete) determine suitability for new designs

Substitute Categories:

Direct Electrical Equivalent (100Ohm, SP4T, 2-circuit): MAX309CSE+ (active, RoHS3 compliant packaging variant), ADG409BRZ, ADG409BRZ-REEL, ADG409BRZ-REEL7
Higher On-State Resistance Substitutes (200Ohm–270Ohm, SP4T, 2-circuit): ADG1209YRZ, ADG1209YRZ-REEL7, ADG1309BRZ-REEL7, ADG439FBRWZ, ADG439FBRZ, ADG439FBRZ-REEL

These higher-resistance parts are suitable only when the application's impedance budget permits increased on-state resistance.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	ΔRon (Max)	V+ Supply	V± Supply	Ton/Toff (Max)	Charge Injection	Leakage (Max)	Crosstalk	Temp Range	Package	Status	RoHS
MAX309CSE	Analog Devices/Maxim	100Ohm	1.5Ohm	5V~30V	±5V~20V	150ns, 150ns	2pC	750pA	-92dB@100kHz	0°C~70°C	16-SOIC	Obsolete	Non-compliant
MAX309CSE+	Analog Devices/Maxim	100Ohm	1.5Ohm	5V~30V	±5V~20V	150ns, 150ns	2pC	750pA	-92dB@100kHz	0°C~70°C	16-SOIC	Active	RoHS3
ADG409BRZ	Analog Devices	100Ohm	15Ohm (Max)	12V	±15V	—	20pC	500pA	-85dB@100kHz	-40°C~85°C	16-SOIC	Active	RoHS3
ADG409BRZ-REEL	Analog Devices	100Ohm	15Ohm (Max)	12V	±15V	—	20pC	500pA	-85dB@100kHz	-40°C~85°C	16-SOIC	Active	RoHS3
ADG409BRZ-REEL7	Analog Devices	100Ohm	15Ohm (Max)	12V	±15V	—	20pC	500pA	-85dB@100kHz	-40°C~85°C	16-SOIC	Active	RoHS3
ADG1209YRZ	Analog Devices	200Ohm	4.6Ohm	5V~16.5V	±5V~16.5V	95ns, 100ns	0.4pC	100pA	-85dB@1MHz	-40°C~125°C	16-SOIC	Active	RoHS3
ADG1209YRZ-REEL7	Analog Devices	200Ohm	4.6Ohm	5V~16.5V	±5V~16.5V	95ns, 100ns	0.4pC	100pA	-85dB@1MHz	-40°C~125°C	16-SOIC	Active	RoHS3
ADG1309BRZ-REEL7	Analog Devices	210Ohm	5Ohm	5V~16.5V	±5V~16.5V	100ns, 100ns	2pC	1nA	-80dB@1MHz	-40°C~105°C	16-SOIC	Active	RoHS3
ADG439FBRWZ	Analog Devices	270Ohm (Typ)	8.1Ohm	15V	±15V	230ns, 130ns	15pC	500pA	-93dB@100kHz	-40°C~125°C	16-SOIC	Active	RoHS3
ADG439FBRZ	Analog Devices	270Ohm (Typ)	8.1Ohm	15V	±15V	230ns, 130ns	15pC	500pA	-93dB@100kHz	-40°C~125°C	16-SOIC	Active	RoHS3
ADG439FBRZ-REEL	Analog Devices	270Ohm (Typ)	8.1Ohm	15V	±15V	230ns, 130ns	15pC	500pA	-93dB@100kHz	-40°C~125°C	16-SOIC	Active	RoHS3

Engineering Selection Recommendations

For Direct Replacement (100Ohm On-State Resistance):

MAX309CSE+ is the primary active equivalent. It maintains identical electrical specifications to the obsolete MAX309CSE while offering RoHS3 compliance and active product status. This part is suitable for designs requiring the original 100Ohm on-state resistance and wide supply voltage range (5V–30V single, ±5V–20V dual).

ADG409BRZ, ADG409BRZ-REEL, and ADG409BRZ-REEL7 provide 100Ohm on-state resistance with active status and RoHS3 compliance. However, these parts operate at fixed supply voltages (12V single, ±15V dual) and exhibit higher channel-to-channel matching variation (15Ohm max vs. 1.5Ohm). These are suitable only when the application's supply voltage and impedance matching requirements align with ADG409 specifications.

For Applications Tolerating Higher On-State Resistance:

ADG1209YRZ and ADG1209YRZ-REEL7 (200Ohm) offer superior performance characteristics including lower charge injection (0.4pC vs. 2pC), reduced leakage current (100pA vs. 750pA), and extended operating temperature range (-40°C to 125°C). These parts are suitable for applications where impedance budget permits 200Ohm on-state resistance and supply voltage is limited to 5V–16.5V.

ADG1309BRZ-REEL7 (210Ohm) and ADG439 series (270Ohm) are suitable only for applications with significantly relaxed impedance requirements. The ADG439 series offers the widest operating temperature range (-40°C to 125°C) and highest crosstalk performance (-93dB @ 100kHz).

Compliance and Lifecycle Considerations:

All recommended active substitutes carry RoHS3 compliance certification. The MAX309CSE is RoHS non-compliant and obsolete; new designs must transition to an active equivalent. MAX309CSE+ is the preferred choice for design continuity. For new product development, ADG1209 or ADG1309 series offer superior long-term availability and performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can ADG409BRZ directly replace MAX309CSE in all applications?

A: ADG409BRZ maintains the 100Ohm on-state resistance and SP4T 2-circuit configuration. However, it differs in supply voltage specification (fixed 12V/±15V vs. wide range 5V–30V/±5V–20V), channel-to-channel matching (15Ohm max vs. 1.5Ohm), and charge injection (20pC vs. 2pC). Substitution is valid only when the application operates at 12V or ±15V supply and can tolerate the higher matching variation and charge injection.

Q: What is the primary reason to substitute MAX309CSE?

A: MAX309CSE is classified as obsolete. Continued use in new designs creates supply chain risk. MAX309CSE+ provides identical electrical performance with active status and RoHS3 compliance, making it the recommended transition path.

Q: Can I use ADG1209YRZ instead of MAX309CSE?

A: ADG1209YRZ is electrically compatible only if the application's impedance budget permits 200Ohm on-state resistance (vs. 100Ohm) and supply voltage is limited to 5V–16.5V (vs. 5V–30V). The ADG1209 offers superior charge injection and leakage specifications, making it suitable for low-noise, low-power applications. Detailed circuit analysis is required to confirm compatibility.

Q: Are all substitute parts available in the same package?

A: All listed substitutes use 16-SOIC surface mount packaging. However, ADG439FBRWZ uses a wider 16-SOIC variant (0.295" vs. 0.154" width). PCB layout verification is required before substitution. ADG409, ADG1209, and ADG1309 series use standard 0.154" width 16-SOIC, matching the MAX309CSE footprint.

Q: What is the difference between ADG409BRZ, ADG409BRZ-REEL, and ADG409BRZ-REEL7?

A: These part numbers differ only in packaging format: ADG409BRZ is supplied in tube packaging, ADG409BRZ-REEL in cut tape with standard reel, and ADG409BRZ-REEL7 in cut tape with Digi-Reel format. Electrical specifications are identical. Selection depends on procurement and assembly requirements.

Q: Which substitute offers the best performance for audio applications?

A: For audio applications prioritizing low charge injection and minimal crosstalk, ADG1209YRZ (0.4pC charge injection, -85dB crosstalk @ 1MHz) or ADG439FBRZ (15pC charge injection, -93dB crosstalk @ 100kHz) are suitable. The choice depends on frequency range and impedance requirements. ADG1209 is preferred for lower impedance paths; ADG439 for higher impedance paths requiring superior crosstalk rejection.

Q: Is MAX309CSE+ pin-compatible with MAX309CSE?

A: Yes. MAX309CSE+ is the active production variant of MAX309CSE with identical pinout, package, and electrical specifications. It is a direct replacement requiring no circuit modifications.

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