MAX309CPE Equivalent & Substitute Parts

Part Overview

The MAX309CPE is a 2-circuit SP4T analog switch IC with 100Ohm on-state resistance, designed for signal routing and multiplexing applications in 16-DIP through-hole packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Active alternatives with identical or compatible electrical and mechanical specifications are available from Analog Devices and Vishay Siliconix.

Key Parameters

Parameter	MAX309CPE
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 (TA)
Package / Case	16-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the MAX309CPE is determined by strict equivalence in the following critical parameters:

Primary Substitution Criteria:

Switch circuit configuration: SP4T with 2 circuits, 4:1 multiplexer/demultiplexer
On-state resistance: 100Ohm maximum
Package and mounting: 16-DIP through-hole form factor
Pin compatibility: 16-PDIP supplier device package

Secondary Compatibility Factors:

Supply voltage ranges (single and dual supply options)
Switch timing characteristics (Ton, Toff)
Leakage current and crosstalk performance
Operating temperature range
RoHS and regulatory compliance status

Substitute parts are grouped into two categories:

Category 1 - Direct Electrical Equivalents (100Ohm On-State Resistance):

MAX309CPE+ (Analog Devices): Identical electrical specifications with active product status and RoHS3 compliance
ADG409BNZ (Analog Devices): Meets 100Ohm specification with extended operating temperature range (-40°C ~ 85°C) and RoHS3 compliance
DG409DJ-E3 (Vishay Siliconix): Meets 100Ohm specification with extended operating temperature range and RoHS3 compliance

Category 2 - Functional Alternative (30Ohm On-State Resistance):

ADG609BNZ (Analog Devices): Lower on-state resistance (30Ohm) for applications requiring reduced insertion loss; operates at lower supply voltages (3.3V ~ 5V single supply); RoHS3 compliant

Parameter Comparison

Parameter	MAX309CPE	MAX309CPE+	ADG409BNZ	DG409DJ-E3	ADG609BNZ
Switch Circuit	SP4T	SP4T	SP4T	SP4T	SP4T
Number of Circuits	2	2	2	2	2
Multiplexer/Demultiplexer	4:1	4:1	4:1	4:1	4:1
On-State Resistance (Max)	100Ohm	100Ohm	100Ohm	100Ohm	30Ohm
Channel-to-Channel Matching (ΔRon)	1.5Ohm	1.5Ohm	15Ohm (Max)	15Ohm (Max)	5Ohm (Max)
Voltage - Supply, Single (V+)	5V ~ 30V	5V ~ 30V	12V	13V ~ 44V	3.3V ~ 5V
Voltage - Supply, Dual (V±)	±5V ~ 20V	±5V ~ 20V	±15V	±5V ~ 20V	±5V
Switch Time Ton (Max)	150ns	150ns	—	150ns	75ns
Switch Time Toff (Max)	150ns	150ns	—	150ns	45ns
Charge Injection	2pC	2pC	20pC	20pC	6pC
Channel Capacitance CS(off)	3pF	3pF	11pF	3pF	9pF
Channel Capacitance CD(off)	26pF	26pF	20pF	14pF	20pF
Current - Leakage IS(off) (Max)	750pA	750pA	500pA	500pA	500pA
Crosstalk	-92dB @ 100kHz	-92dB @ 100kHz	-85dB @ 100kHz	—	-85dB @ 100kHz
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

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

MAX309CPE+ is the preferred direct substitute. It maintains identical electrical specifications to the MAX309CPE while offering active product status and RoHS3 compliance. This part is suitable for designs requiring no circuit modifications and is available in tube packaging.

ADG409BNZ and DG409DJ-E3 are functionally equivalent alternatives with 100Ohm on-state resistance. Both offer extended operating temperature ranges (-40°C ~ 85°C) and RoHS3 compliance. ADG409BNZ operates at ±15V dual supply, while DG409DJ-E3 supports extended single supply voltage (13V ~ 44V). These parts exhibit higher channel-to-channel matching variation (15Ohm max) and increased charge injection (20pC) compared to the original specification.

For Applications Tolerating Lower On-State Resistance:

ADG609BNZ provides 30Ohm on-state resistance with improved switching speed (75ns Ton, 45ns Toff) and lower charge injection (6pC). This part is suitable for low-voltage applications (3.3V ~ 5V single supply, ±5V dual supply) where reduced insertion loss is beneficial. RoHS3 compliance is provided.

Compliance Considerations:

All active substitute parts are RoHS3 compliant, addressing regulatory requirements for new designs. The original MAX309CPE is RoHS non-compliant and should be replaced in applications subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can MAX309CPE+ be used as a direct drop-in replacement for MAX309CPE?

A: Yes. MAX309CPE+ maintains identical electrical and mechanical specifications, including 100Ohm on-state resistance, 2-circuit SP4T configuration, 16-DIP through-hole package, and pin compatibility. The primary difference is product status (active vs. obsolete) and RoHS3 compliance.

Q: What are the key differences between ADG409BNZ and DG409DJ-E3?

A: Both parts meet the 100Ohm on-state resistance requirement and 16-DIP package specification. ADG409BNZ operates at ±15V dual supply with 12V single supply. DG409DJ-E3 supports extended single supply voltage (13V ~ 44V) and ±5V ~ 20V dual supply. DG409DJ-E3 offers tighter channel capacitance matching (3pF vs. 11pF for CS(off)). Both exhibit 15Ohm maximum channel-to-channel matching and 20pC charge injection.

Q: When should ADG609BNZ be selected instead of 100Ohm alternatives?

A: ADG609BNZ is selected for applications where lower on-state resistance (30Ohm) reduces insertion loss and improves signal integrity. This part is optimized for low-voltage operation (3.3V ~ 5V single supply) and offers faster switching times (75ns Ton, 45ns Toff). It is not suitable for applications requiring 100Ohm on-state resistance or higher supply voltages.

Q: Are all substitute parts available in 16-DIP through-hole packaging?

A: Yes. All substitute parts listed are available in 16-DIP (0.300", 7.62mm) through-hole packaging with 16-PDIP supplier device package designation, ensuring mechanical and pin compatibility with the original MAX309CPE.

Q: What is the impact of higher channel-to-channel matching (ΔRon) in substitute parts?

A: ADG409BNZ and DG409DJ-E3 specify 15Ohm maximum channel-to-channel matching compared to 1.5Ohm for MAX309CPE and MAX309CPE+. This indicates greater variation in on-state resistance between channels. Applications requiring tight matching of signal levels across multiple channels should prioritize MAX309CPE+ or evaluate circuit-level compensation.

Q: Do all substitute parts support the original supply voltage range?

A: No. ADG409BNZ operates at fixed 12V single supply and ±15V dual supply. ADG609BNZ is limited to 3.3V ~ 5V single supply and ±5V dual supply. Only MAX309CPE+, DG409DJ-E3, and the original MAX309CPE support the full 5V ~ 30V single supply range. Verify supply voltage compatibility before selection.

Q: Are there temperature range considerations for substitute selection?

A: The original MAX309CPE operates at 0°C ~ 70°C. All active substitutes (MAX309CPE+, ADG409BNZ, DG409DJ-E3, ADG609BNZ) support extended operating temperature range of -40°C ~ 85°C, providing greater thermal margin for industrial and automotive applications.

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