DG309CJ Equivalent & Substitute Parts

Part Overview

The DG309CJ is a 4-circuit SPST-NC (Single Pole Single Throw - Normally Closed) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated. This component operates as a 1:1 multiplexer/demultiplexer with 100Ohm on-state resistance and is housed in a 16-DIP through-hole package. The DG309CJ is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain functional compatibility across switching characteristics, supply voltage ranges, and package form factor while meeting current RoHS and environmental compliance standards.

Key Parameters

Parameter	DG309CJ
Switch Circuit Type	SPST - NC
Number of Circuits	4
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	100Ohm
Voltage - Supply, Single (V+)	5V ~ 30V
Voltage - Supply, Dual (V±)	±5V ~ 20V
Switch Time - Ton (Max)	250ns
Switch Time - Toff (Max)	150ns
Charge Injection	-10pC
Channel Capacitance - CS(off)	11pF
Channel Capacitance - CD(off)	8pF
Current - Leakage (IS(off)) (Max)	5nA
Operating Temperature Range	0°C ~ 70°C
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 DG309CJ is determined by the following critical parameters:

Functional Requirements:

Switch circuit type must be SPST - NC
Number of circuits must be 4
Multiplexer/demultiplexer configuration must be 1:1
Package must be 16-DIP (0.300", 7.62mm) through-hole

Electrical Compatibility Criteria:

On-state resistance must be within acceptable range for the application (100Ohm nominal for DG309CJ)
Supply voltage ranges must support the system design (single supply 5V ~ 30V or dual supply ±5V ~ 20V)
Switch timing characteristics (Ton, Toff) must meet application speed requirements
Leakage current and charge injection must be acceptable for signal integrity

Compliance and Availability:

Active product status is preferred for new designs
RoHS3 compliance is required for modern applications
Adequate inventory availability

The substitute parts identified fall into two categories: direct equivalents (DG309CJ+, DG309CJ-E3) and functional alternatives with modified electrical characteristics (DG271BCJ-E3, DG309BDJ-E3).

Parameter Comparison

Parameter	DG309CJ	DG309CJ+	DG309CJ-E3	DG309BDJ-E3	DG271BCJ-E3
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Vishay Siliconix	Vishay Siliconix	Vishay Siliconix
Switch Circuit Type	SPST - NC	SPST - NC	SPST - NC	SPST - NC	SPST - NC
Number of Circuits	4	4	4	4	4
On-State Resistance (Max)	100Ohm	100Ohm	85Ohm	85Ohm	50Ohm
Voltage - Supply, Single (V+)	5V ~ 30V	5V ~ 30V	4V ~ 44V	4V ~ 44V	Not specified
Voltage - Supply, Dual (V±)	±5V ~ 20V	±5V ~ 20V	±4V ~ 22V	±4V ~ 22V	±15V
Switch Time - Ton (Max)	250ns	250ns	200ns	200ns	65ns
Switch Time - Toff (Max)	150ns	150ns	150ns	150ns	65ns
Charge Injection	-10pC	-10pC	1pC	1pC	-5pC
Channel Capacitance - CS(off)	11pF	11pF	5pF	5pF	8pF
Channel Capacitance - CD(off)	8pF	8pF	5pF	5pF	8pF
Current - Leakage (IS(off)) (Max)	5nA	5nA	500pA	500pA	1nA
Operating Temperature Range	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)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent - Preferred for Pin-Compatible Replacement:

DG309CJ+ is the primary direct substitute. It maintains identical electrical specifications (100Ohm on-state resistance, 250ns/150ns switching times, ±5V ~ 20V dual supply range) and 16-DIP package form factor. The DG309CJ+ is manufactured by the same original supplier (Analog Devices Inc./Maxim Integrated) and carries active product status with ROHS3 compliance. This part is suitable for direct board-level substitution without circuit redesign.

Alternative with Enhanced Performance - Vishay Siliconix DG309CJ-E3:

DG309CJ-E3 provides improved electrical characteristics including lower on-state resistance (85Ohm vs. 100Ohm), reduced leakage current (500pA vs. 5nA), and lower channel capacitance (5pF vs. 11pF). Extended operating temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C) and ROHS3 compliance make this suitable for demanding applications. Slightly faster switching time (200ns vs. 250ns) may benefit high-frequency circuits. This part requires electrical verification for applications sensitive to on-state resistance changes.

Lower On-State Resistance Option - DG271BCJ-E3:

DG271BCJ-E3 offers the lowest on-state resistance (50Ohm) and fastest switching times (65ns for both Ton and Toff). This part is suitable only for applications where lower resistance and higher switching speed are required. Supply voltage is limited to dual ±15V operation. Significant electrical differences require full circuit analysis before substitution.

Lower On-State Resistance Option - DG309BDJ-E3:

DG309BDJ-E3 provides intermediate on-state resistance (85Ohm) with extended supply voltage range (4V ~ 44V single supply, ±4V ~ 22V dual supply). This part offers broader voltage compatibility while maintaining similar switching characteristics to DG309CJ-E3. ROHS3 compliance and active status support modern design requirements.

Compliance Consideration:

All active substitute parts carry ROHS3 compliance, addressing the non-compliant status of the obsolete DG309CJ. For new designs and production transitions, ROHS3-compliant alternatives are required.

Frequently Asked Questions (FAQ)

Q: Can DG309CJ+ be used as a direct replacement for DG309CJ?

A: Yes. DG309CJ+ maintains identical electrical specifications, package form factor (16-DIP), and functional characteristics. It is a direct pin-compatible substitute suitable for board-level replacement without circuit modification.

Q: What is the difference between DG309CJ-E3 and DG309CJ+?

A: DG309CJ-E3 is manufactured by Vishay Siliconix and features improved electrical performance: lower on-state resistance (85Ohm vs. 100Ohm), significantly reduced leakage current (500pA vs. 5nA), and lower channel capacitance (5pF vs. 11pF). Both maintain the same package and basic functional characteristics. DG309CJ-E3 supports extended operating temperature (-40°C ~ 85°C vs. 0°C ~ 70°C).

Q: When should DG271BCJ-E3 be selected instead of DG309CJ+?

A: DG271BCJ-E3 is selected only when the application requires the lowest on-state resistance (50Ohm) and fastest switching times (65ns). This part operates only with dual ±15V supply, limiting its use to applications with this specific voltage requirement. Full circuit analysis is required before substitution.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts (DG309CJ+, DG309CJ-E3, DG309BDJ-E3, DG271BCJ-E3) carry ROHS3 compliance. The original DG309CJ is RoHS non-compliant, making compliant substitutes necessary for modern production.

Q: What is the impact of on-state resistance differences on circuit performance?

A: On-state resistance affects signal attenuation and power dissipation. Lower resistance (50Ohm in DG271BCJ-E3, 85Ohm in DG309CJ-E3/DG309BDJ-E3) reduces signal loss and heat generation compared to the original 100Ohm specification. Applications sensitive to signal integrity or operating in high-temperature environments may benefit from lower resistance alternatives. Circuits designed for 100Ohm operation must be analyzed before substituting lower-resistance parts.

Q: Can substitute parts operate across the full voltage range of the original DG309CJ?

A: DG309CJ+ maintains the identical voltage range (5V ~ 30V single supply, ±5V ~ 20V dual supply). DG309CJ-E3 and DG309BDJ-E3 support extended ranges (4V ~ 44V single supply, ±4V ~ 22V dual supply), providing broader compatibility. DG271BCJ-E3 operates only with ±15V dual supply and does not support single-supply operation.

Q: Is the 16-DIP package identical across all substitute parts?

A: Yes. All substitute parts use the same 16-DIP (0.300", 7.62mm) through-hole package with identical pin assignments, ensuring mechanical and electrical compatibility on existing PCBs.

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