DG418BDY Equivalent & Substitute Parts

Part Overview

The DG418BDY is a single-circuit SPST-NO (Normally Open) analog switch IC manufactured by Vishay Siliconix in 8-SOIC surface mount packaging. This component features 25Ω on-state resistance and operates across dual supply voltages (±7V to ±22V) or single supply (13V to 36V). The DG418BDY is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	DG418BDY
Switch Circuit Type	SPST - NO
Number of Circuits	1
On-State Resistance (Max)	25Ω
Voltage - Supply, Single (V+)	13V ~ 36V
Voltage - Supply, Dual (V±)	±7V ~ 22V
Switch Time (Ton, Toff) (Max)	89ns, 80ns
Charge Injection	38pC
Channel Capacitance (CS(off), CD(off))	12pF, 12pF
Current - Leakage (IS(off)) (Max)	250pA
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the DG418BDY is determined by the following critical parameters:

Functional Compatibility Requirements:

Switch circuit type: SPST - NO
Number of circuits: 1
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount

Electrical Performance Criteria:

On-state resistance tolerance (25Ω baseline)
Supply voltage range compatibility
Switch timing characteristics (Ton, Toff)
Leakage current specifications
Operating temperature range

Substitute parts are grouped into two categories:

Category 1: Direct Parametric Equivalents — Parts maintaining the same on-state resistance (25Ω) and electrical characteristics as the DG418BDY while offering improved product status and compliance.

Category 2: Functional Alternatives — Parts with modified on-state resistance (35Ω or 20Ω) and adjusted electrical parameters that maintain SPST-NO functionality and 8-SOIC packaging but operate within different supply voltage ranges or temperature specifications.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	V+ Supply	V± Supply	Ton/Toff (Max)	Operating Temp	Product Status	RoHS Status
DG418BDY	Vishay Siliconix	25Ω	13V ~ 36V	±7V ~ 22V	89ns, 80ns	-40°C ~ 85°C	Obsolete	RoHS non-compliant
DG418BDY-E3	Vishay Siliconix	25Ω	13V ~ 36V	±7V ~ 22V	89ns, 80ns	-40°C ~ 85°C	Active	ROHS3 Compliant
DG418CY+	Analog Devices Inc./Maxim Integrated	35Ω	10V ~ 30V	±4.5V ~ 20V	175ns, 145ns	0°C ~ 70°C	Active	ROHS3 Compliant
DG418DY+	Analog Devices Inc./Maxim Integrated	35Ω	10V ~ 30V	±4.5V ~ 20V	175ns, 145ns	-40°C ~ 85°C	Active	ROHS3 Compliant
DG418LDY+	Analog Devices Inc./Maxim Integrated	35Ω	9V ~ 36V	±4.5V ~ 20V	175ns, 185ns	-40°C ~ 85°C	Active	ROHS3 Compliant
MAX318CSA+	Analog Devices Inc./Maxim Integrated	35Ω	10V ~ 30V	±4.5V ~ 20V	175ns, 145ns	0°C ~ 70°C	Active	ROHS3 Compliant
MAX318CSA+T	Analog Devices Inc./Maxim Integrated	35Ω	10V ~ 30V	±4.5V ~ 20V	175ns, 145ns	0°C ~ 70°C	Active	ROHS3 Compliant
MAX4516CSA+	Analog Devices Inc./Maxim Integrated	20Ω	2V ~ 12V	±1V ~ 6V	100ns, 75ns	0°C ~ 70°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

DG418BDY-E3 is the primary equivalent. It maintains identical on-state resistance (25Ω), supply voltage ranges, and operating temperature specifications (-40°C to 85°C) as the obsolete DG418BDY. The DG418BDY-E3 is active in production and ROHS3 compliant, making it suitable for new designs and production continuity without circuit redesign.

For Active Supply Voltage Range (13V ~ 36V Single Supply):

DG418LDY+ supports the extended single supply voltage range (9V ~ 36V) required by legacy designs operating at 13V to 36V. This part maintains the -40°C to 85°C operating temperature range and is ROHS3 compliant. The 35Ω on-state resistance represents a 40% increase over the original 25Ω specification; circuit validation is required if on-state resistance is a critical design parameter.

For Standard Industrial Temperature Range (0°C ~ 70°C):

DG418CY+, MAX318CSA+, and MAX318CSA+T are suitable for applications with restricted operating temperature requirements. These parts feature 35Ω on-state resistance and are ROHS3 compliant. MAX318CSA+ and MAX318CSA+T are functionally identical; packaging differs (Tube vs. unspecified).

For Low-Voltage Applications (2V ~ 12V Supply):

MAX4516CSA+ is specified for low-voltage operation (2V to 12V single supply, ±1V to ±6V dual supply). This part features the lowest on-state resistance (20Ω) among available substitutes and is not suitable for designs requiring 13V to 36V supply voltage operation. Operating temperature is limited to 0°C ~ 70°C.

Compliance Consideration:

All active substitute parts are ROHS3 compliant. The original DG418BDY is RoHS non-compliant; migration to compliant alternatives is recommended for new production and long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can DG418BDY-E3 be used as a direct drop-in replacement for DG418BDY?

A: Yes. DG418BDY-E3 maintains identical electrical specifications (25Ω on-state resistance, ±7V ~ ±22V dual supply, 13V ~ 36V single supply, -40°C ~ 85°C operating temperature) and 8-SOIC packaging. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the impact of increased on-state resistance in DG418CY+, DG418DY+, DG418LDY+, and MAX318CSA+ substitutes?

A: These parts feature 35Ω on-state resistance compared to the original 25Ω specification, representing a 40% increase. This affects signal attenuation, power dissipation, and switching performance. Circuit validation is required to confirm compatibility with application requirements for signal integrity and thermal management.

Q: Which substitute part supports the full -40°C ~ 85°C operating temperature range?

A: DG418BDY-E3, DG418DY+, and DG418LDY+ support the -40°C ~ 85°C operating temperature range. DG418CY+, MAX318CSA+, MAX318CSA+T, and MAX4516CSA+ are limited to 0°C ~ 70°C operation.

Q: Is MAX4516CSA+ compatible with designs requiring 13V ~ 36V supply voltage?

A: No. MAX4516CSA+ is specified for 2V ~ 12V single supply and ±1V ~ ±6V dual supply operation. It is not suitable for applications requiring 13V to 36V supply voltage. Use DG418BDY-E3 or DG418LDY+ for this requirement.

Q: What packaging options are available for substitute parts?

A: All substitute parts are supplied in 8-SOIC (0.154", 3.90mm Width) surface mount packaging, matching the original DG418BDY package. Packaging variants (Tube, unspecified) do not affect electrical compatibility or PCB footprint.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts (DG418BDY-E3, DG418CY+, DG418DY+, DG418LDY+, MAX318CSA+, MAX318CSA+T, MAX4516CSA+) are ROHS3 compliant. The original DG418BDY is RoHS non-compliant.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message