DG418DY Equivalent & Substitute Parts

Part Overview

The DG418DY is a single-circuit SPST-NO (Normally Open) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-SOIC surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. The DG418DY provides 1:1 multiplexing functionality with 35Ohm on-state resistance, suitable for signal routing and switching applications in analog circuits.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO
Multiplexer/Demultiplexer Configuration	1:1
Number of Circuits	1
On-State Resistance (Max)	35Ohm
Channel-to-Channel Matching (ΔRon)	3Ohm (Max)
Voltage - Supply, Single (V+)	10V ~ 30V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V
Switch Time (Ton, Toff) (Max)	175ns, 145ns
Charge Injection	3pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF
Current - Leakage (IS(off)) (Max)	250pA
Crosstalk	-85dB @ 1MHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DG418DY is determined by the following critical parameters:

Primary Substitution Criteria:

Switch circuit type: SPST - NO
Multiplexer configuration: 1:1
Number of circuits: 1
Package type: 8-SOIC surface mount
Operating temperature range: -40°C ~ 85°C
On-state resistance: 35Ohm (for direct equivalents)

Secondary Compatibility Parameters:

Supply voltage ranges (single and dual)
Switch timing characteristics (Ton, Toff)
Leakage current specifications
Channel capacitance values

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (35Ohm On-State Resistance)

DG418DY+ (Analog Devices Inc./Maxim Integrated, Active, Tube packaging)
DG418DY-E3 (Vishay Siliconix, Active, Tube packaging)
DG418DY-T1-E3 (Vishay Siliconix, Active, Tape & Reel packaging)

Category 2: Functional Alternatives (25Ohm On-State Resistance)

DG418BDY-E3 (Vishay Siliconix, Active, Tube packaging)
DG418BDY-T1-E3 (Vishay Siliconix, Active, Tape & Reel packaging)

Parameter Comparison

Parameter	DG418DY (Main)	DG418DY+	DG418DY-E3	DG418DY-T1-E3	DG418BDY-E3	DG418BDY-T1-E3
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Vishay Siliconix	Vishay Siliconix	Vishay Siliconix	Vishay Siliconix
Product Status	Obsolete	Active	Active	Active	Active	Active
Packaging	-	Tube	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO
On-State Resistance (Max)	35Ohm	35Ohm	35Ohm	35Ohm	25Ohm	25Ohm
Voltage - Supply, Single (V+)	10V ~ 30V	10V ~ 30V	12V	12V	13V ~ 36V	13V ~ 36V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V	±4.5V ~ 20V	±15V	±15V	±7V ~ 22V	±7V ~ 22V
Switch Time (Ton, Toff) (Max)	175ns, 145ns	175ns, 145ns	175ns, 145ns	175ns, 145ns	89ns, 80ns	89ns, 80ns
Charge Injection	3pC	3pC	60pC	60pC	38pC	38pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF	8pF, 8pF	8pF, 8pF	8pF, 8pF	12pF, 12pF	12pF, 12pF
Current - Leakage (IS(off)) (Max)	250pA	250pA	250pA	250pA	250pA	250pA
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

Select DG418DY+ when tube packaging is acceptable. This part maintains identical electrical specifications to the original DG418DY while offering active product status and ROHS3 compliance. Inventory availability is 1900 pcs.

Select DG418DY-E3 or DG418DY-T1-E3 (Vishay Siliconix variants) as alternatives with active status and ROHS3 compliance. DG418DY-T1-E3 offers the highest inventory availability at 25,100 pcs in Tape & Reel format, suitable for automated assembly processes. Note that Vishay variants specify fixed supply voltages (12V single, ±15V dual) compared to the original's wider ranges.

For Functional Substitution (Improved Performance):

DG418BDY-E3 and DG418BDY-T1-E3 provide lower on-state resistance (25Ohm vs. 35Ohm) and faster switching times (89ns/80ns vs. 175ns/145ns). These parts are suitable when improved signal integrity and reduced power dissipation are beneficial. Supply voltage ranges are wider (13V ~ 36V single, ±7V ~ 22V dual). Higher channel capacitance (12pF vs. 8pF) and charge injection (38pC vs. 3pC) must be evaluated for circuit compatibility.

Compliance Considerations:

All substitute parts are ROHS3 compliant, addressing environmental regulatory requirements. The original DG418DY is RoHS non-compliant. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating and identical operating temperature range (-40°C ~ 85°C).

Frequently Asked Questions (FAQ)

Q: Can DG418BDY-E3 or DG418BDY-T1-E3 be used as direct replacements for DG418DY?

A: These parts are functionally compatible but not direct equivalents. The 25Ohm on-state resistance (vs. 35Ohm) and faster switching times represent performance improvements. However, higher channel capacitance (12pF vs. 8pF) and charge injection (38pC vs. 3pC) may affect circuit behavior in sensitive analog applications. Circuit simulation or bench testing is necessary to confirm compatibility in your specific application.

Q: What is the difference between DG418DY-E3 and DG418DY-T1-E3?

A: Both parts are electrically identical with 35Ohm on-state resistance and identical switching characteristics. The primary difference is packaging: DG418DY-E3 is supplied in Tube format (1295 pcs available), while DG418DY-T1-E3 is supplied in Tape & Reel format (25,100 pcs available). Tape & Reel packaging is standard for high-volume automated assembly; Tube packaging is suitable for lower-volume or manual assembly processes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts (DG418DY+, DG418DY-E3, DG418DY-T1-E3, DG418BDY-E3, DG418BDY-T1-E3) are ROHS3 compliant. The original DG418DY is RoHS non-compliant. If your application or market requires RoHS compliance, any of the active substitute parts satisfy this requirement.

Q: What supply voltage ranges should I verify before substitution?

A: The original DG418DY supports 10V ~ 30V (single supply) and ±4.5V ~ 20V (dual supply). Vishay variants (DG418DY-E3, DG418DY-T1-E3) specify fixed voltages: 12V (single) and ±15V (dual). DG418BDY variants support 13V ~ 36V (single) and ±7V ~ 22V (dual). Confirm your circuit's supply voltage falls within the substitute part's specified range before selection.

Q: How do the switching time differences affect circuit performance?

A: DG418BDY variants (89ns Ton, 80ns Toff) switch approximately twice as fast as the original DG418DY (175ns Ton, 145ns Toff). Faster switching reduces signal settling time and may improve overall circuit bandwidth. In applications sensitive to switching transients or where signal integrity is critical, faster switching can be advantageous. Conversely, in noise-sensitive circuits, the original's slower switching may have been intentional for noise reduction.

Q: Can I mix packaging formats (Tube vs. Tape & Reel) in production?

A: Tube and Tape & Reel packaging formats are mechanically and electrically equivalent. However, they require different handling and assembly equipment. Mixing formats within a single production run increases complexity and cost. Select one packaging format for consistency: Tape & Reel for automated high-volume assembly, Tube for lower-volume or manual processes.

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