DG405DY Equivalent & Substitute Parts

Part Overview

The DG405DY is a 2-circuit IC switch with DPST-NO configuration and 45Ohm on-state resistance, manufactured by Vishay Siliconix in a 16-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The DG405DY operates across dual supply voltages (±7V to ±22V) and single supply voltages (13V to 36V), with switching times of 150ns (Ton) and 100ns (Toff).

Key Parameters

Parameter	Value
Manufacturer Part Number	DG405DY
Manufacturer	Vishay Siliconix
Category	Interface
Switch Circuit	DPST - NO
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	2
On-State Resistance (Max)	45Ohm
Voltage - Supply, Single (V+)	13V ~ 36V
Voltage - Supply, Dual (V±)	±7V ~ 22V
Switch Time (Ton, Toff) (Max)	150ns, 100ns
Charge Injection	60pC
Channel Capacitance (CS(off), CD(off))	12pF, 12pF
Current - Leakage (IS(off)) (Max)	500pA
Crosstalk	-90dB @ 1MHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the DG405DY is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Switch circuit configuration (DPST - NO)
Multiplexer/demultiplexer circuit (2:1)
Number of circuits (2)
On-state resistance (45Ohm maximum)
Package type (16-SOIC)
Mounting type (Surface Mount)

Voltage and Thermal Compatibility:

Supply voltage ranges must accommodate the original operating conditions
Operating temperature range must support the application environment

Secondary Performance Parameters:

Switch timing (Ton, Toff)
Charge injection
Channel capacitance
Leakage current
Crosstalk performance

The DG405DY-E3 is a parametric equivalent with identical electrical specifications but improved RoHS3 compliance and active product status. The DG405CY+ and DG405DY+ variants are manufacturer-recommended alternatives with narrower operating temperature ranges (0°C to 70°C) and enhanced channel-to-channel matching (500mOhm). The MAX4623ESE+ is a functional alternative with significantly lower on-state resistance (5Ohm) and broader supply voltage compatibility, suitable for applications where lower resistance is beneficial.

Parameter Comparison

Parameter	DG405DY	DG405DY-E3	DG405CY+	DG405DY+	MAX4623ESE+
Manufacturer	Vishay Siliconix	Vishay Siliconix	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Switch Circuit	DPST - NO	DPST - NO	DPST - NO	DPST - NO	DPST - NO
Multiplexer/Demultiplexer Circuit	2:1	2:1	2:1	2:1	2:1
Number of Circuits	2	2	2	2	2
On-State Resistance (Max)	45Ohm	45Ohm	45Ohm	45Ohm	5Ohm
Channel-to-Channel Matching (ΔRon)	—	—	500mOhm	500mOhm	250mOhm
Voltage - Supply, Single (V+)	13V ~ 36V	13V ~ 36V	10V ~ 30V	10V ~ 30V	4.5V ~ 36V
Voltage - Supply, Dual (V±)	±7V ~ 22V	±7V ~ 22V	±4.5V ~ 20V	±4.5V ~ 20V	±4.5V ~ 18V
Switch Time (Ton, Toff) (Max)	150ns, 100ns	150ns, 100ns	150ns, 100ns	150ns, 100ns	250ns, 200ns
Charge Injection	60pC	60pC	10pC	10pC	480pC
Channel Capacitance (CS(off), CD(off))	12pF, 12pF	12pF, 12pF	12pF, 12pF	12pF, 12pF	34pF, 34pF
Current - Leakage (IS(off)) (Max)	500pA	500pA	500pA	500pA	500pA
Crosstalk	-90dB @ 1MHz	-90dB @ 1MHz	-90dB @ 1MHz	-90dB @ 1MHz	-60dB @ 1MHz
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

DG405DY-E3 is the direct parametric equivalent with identical electrical specifications. This part is recommended for applications requiring exact performance matching with the original DG405DY while transitioning to active, RoHS3-compliant inventory. The DG405DY-E3 maintains the full operating temperature range (-40°C to 85°C) and identical supply voltage specifications.

DG405CY+ and DG405DY+ are manufacturer-recommended alternatives from Analog Devices Inc./Maxim Integrated. Both parts maintain the 45Ohm on-state resistance and identical switching characteristics. These parts feature improved channel-to-channel matching (500mOhm) and reduced charge injection (10pC). However, the operating temperature range is narrowed to 0°C to 70°C, and single supply voltage range is reduced to 10V to 30V. These parts are suitable for applications within the specified temperature and voltage constraints.

MAX4623ESE+ is a functional alternative with significantly different electrical characteristics. The 5Ohm on-state resistance provides lower insertion loss and improved signal integrity for applications where resistance is a critical parameter. The MAX4623ESE+ offers the broadest single supply voltage range (4.5V to 36V) and maintains the full operating temperature range (-40°C to 85°C). However, this part exhibits higher charge injection (480pC), increased channel capacitance (34pF), and degraded crosstalk performance (-60dB @ 1MHz). The MAX4623ESE+ is suitable only for applications where lower on-state resistance is required and the performance trade-offs are acceptable.

All substitute parts are RoHS3 compliant and maintain identical package geometry (16-SOIC), enabling direct PCB-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the DG405DY-E3 be used as a direct replacement for the DG405DY?

A: Yes. The DG405DY-E3 is a parametric equivalent with identical electrical specifications, including on-state resistance (45Ohm), supply voltage ranges (13V to 36V single, ±7V to ±22V dual), switching times (150ns, 100ns), and operating temperature range (-40°C to 85°C). The primary difference is improved RoHS3 compliance and active product status.

Q: What are the limitations of using DG405CY+ or DG405DY+ as substitutes?

A: The DG405CY+ and DG405DY+ maintain identical on-state resistance and switching characteristics but operate within a narrower temperature range (0°C to 70°C) compared to the original DG405DY (-40°C to 85°C). Single supply voltage range is also reduced from 13V to 36V to 10V to 30V. These parts are suitable only for applications within these specified operating conditions.

Q: When should the MAX4623ESE+ be considered as a substitute?

A: The MAX4623ESE+ is suitable only for applications where lower on-state resistance (5Ohm versus 45Ohm) provides a functional advantage. This part exhibits significantly different performance characteristics, including higher charge injection (480pC versus 60pC), increased channel capacitance (34pF versus 12pF), and reduced crosstalk performance (-60dB versus -90dB @ 1MHz). Substitution requires verification that these trade-offs are acceptable for the specific application.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. All substitute parts use the 16-SOIC package with identical pin configuration and physical dimensions (0.154" width, 3.90mm). Direct PCB-level substitution is possible without layout modifications.

Q: What compliance advantages do the substitute parts offer?

A: The DG405DY-E3, DG405CY+, DG405DY+, and MAX4623ESE+ are all RoHS3 compliant, whereas the original DG405DY is RoHS non-compliant. All substitute parts maintain REACH Unaffected status and identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: Which substitute part is recommended for new designs?

A: For new designs requiring exact electrical equivalence to the DG405DY, the DG405DY-E3 is recommended due to its identical specifications and active product status. For applications with temperature constraints between 0°C and 70°C, the DG405CY+ or DG405DY+ offer improved channel-to-channel matching and reduced charge injection. The MAX4623ESE+ is recommended only when lower on-state resistance is a design requirement.

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