DG305AAA Equivalent & Substitute Parts

Part Overview

The DG305AAA is a single-circuit SPDT (Single Pole Double Throw) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated, designed for 2:1 multiplexing/demultiplexing applications with 50Ohm on-state resistance. The device is packaged in a TO-100-10 metal can through-hole configuration and operates across a dual supply voltage range of ±5V to ±18V.

The DG305AAA is classified as obsolete. Locating equivalent substitute parts is necessary to support legacy system maintenance, design updates, and procurement continuity where original components are no longer manufactured or available in production quantities.

Key Parameters

Parameter	Value
Switch Circuit Type	SPDT
Multiplexer/Demultiplexer Configuration	2:1
Number of Circuits	1
On-State Resistance (Max)	50Ohm
Voltage Supply Range (Dual)	±5V ~ ±18V
Switch Time - Ton (Max)	250ns
Switch Time - Toff (Max)	150ns
Charge Injection	12pC
Channel Capacitance (CS(off), CD(off))	14pF, 14pF
Current - Leakage (IS(off)) (Max)	5nA
Crosstalk	-74dB @ 500kHz
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Through Hole
Package / Case	TO-100-10 Metal Can
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DG305AAA is determined by strict equivalence across the following core electrical and mechanical parameters:

Electrical Equivalence Criteria:

Switch circuit topology: SPDT configuration
Multiplexer function: 2:1 switching capability
On-state resistance: 50Ohm maximum
Dual supply voltage range: ±5V ~ ±18V operation
Switch timing characteristics: Ton ≤ 250ns, Toff ≤ 150ns
Charge injection: 12pC
Channel capacitance: 14pF (both CS(off) and CD(off))
Leakage current: 5nA maximum
Crosstalk performance: -74dB @ 500kHz

Mechanical Compatibility Criteria:

Through-hole mounting requirement
Package form factor compatibility

The DG305ACJ+ qualifies as a direct substitute based on identical electrical performance across all specified parameters. The primary difference is packaging format (14-DIP versus TO-100-10 metal can) and operating temperature range, which represents a functional constraint rather than an electrical incompatibility.

Parameter Comparison

Parameter	DG305AAA (Main Part)	DG305ACJ+ (Substitute)
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Switch Circuit Type	SPDT	SPDT
Multiplexer Configuration	2:1	2:1
Number of Circuits	1	1
On-State Resistance (Max)	50Ohm	50Ohm
Voltage Supply Range (Dual)	±5V ~ ±18V	±5V ~ ±18V
Switch Time - Ton (Max)	250ns	250ns
Switch Time - Toff (Max)	150ns	150ns
Charge Injection	12pC	12pC
Channel Capacitance (CS(off), CD(off))	14pF, 14pF	14pF, 14pF
Current - Leakage (IS(off)) (Max)	5nA	5nA
Crosstalk	-74dB @ 500kHz	-74dB @ 500kHz
Mounting Type	Through Hole	Through Hole
Package / Case	TO-100-10 Metal Can	14-DIP (0.300", 7.62mm)
Product Status	Obsolete	Active
Operating Temperature Range	-55°C ~ 125°C	0°C ~ 70°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The DG305ACJ+ is the manufacturer-recommended substitute for the obsolete DG305AAA. Both devices share identical electrical specifications across all switching, timing, and signal integrity parameters, ensuring functional equivalence in circuit operation.

Key Selection Considerations:

Operating Temperature Range: The DG305ACJ+ operates within 0°C ~ 70°C, compared to the DG305AAA's -55°C ~ 125°C range. Applications requiring extended temperature operation below 0°C or above 70°C must evaluate whether the narrower operating window is acceptable for the intended deployment environment.

Package Format: The DG305ACJ+ uses 14-DIP through-hole packaging, whereas the DG305AAA uses TO-100-10 metal can packaging. PCB layout modifications and socket compatibility must be assessed during design transition.

Product Status and Compliance: The DG305ACJ+ is actively manufactured and maintains ROHS3 compliance, ensuring long-term availability and regulatory alignment. Both devices carry MSL Level 1 (Unlimited) moisture sensitivity classification.

Supply and Inventory: The DG305ACJ+ is available in production quantities (1338 Pcs in stock), supporting immediate procurement for legacy system support and new designs.

Frequently Asked Questions (FAQ)

Q: Can the DG305ACJ+ directly replace the DG305AAA in existing designs?

A: Electrical substitution is direct—all switching, timing, and signal characteristics are identical. Physical substitution requires PCB layout modification due to different package formats (14-DIP versus TO-100-10 metal can). Operating temperature range must be verified for your application environment.

Q: What is the primary difference between these two parts?

A: The DG305AAA (obsolete, TO-100-10 metal can) and DG305ACJ+ (active, 14-DIP) are electrically equivalent but differ in packaging format and operating temperature range. The DG305ACJ+ operates 0°C ~ 70°C versus the DG305AAA's -55°C ~ 125°C.

Q: Are there any electrical performance differences?

A: No. Both devices deliver identical on-state resistance (50Ohm), switch timing (250ns/150ns), charge injection (12pC), channel capacitance (14pF), leakage current (5nA), and crosstalk performance (-74dB @ 500kHz).

Q: Which part should I specify for new designs?

A: The DG305ACJ+ is the active, manufacturer-recommended part. It is in production, ROHS3 compliant, and available in quantity. The DG305AAA is obsolete and should not be specified for new designs.

Q: Does the package change affect circuit performance?

A: No. The 14-DIP and TO-100-10 metal can packages are functionally equivalent. Package selection is a mechanical and PCB layout consideration, not an electrical one.

Q: Are both parts RoHS compliant?

A: Yes. Both the DG305AAA and DG305ACJ+ are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity classification.

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