DG418DY-T1 Equivalent & Substitute Parts

Part Overview

The DG418DY-T1 is a single-circuit SPST-NO analog switch IC manufactured by Vishay Siliconix, housed in an 8-SOIC surface mount package. This component functions as a high-speed electronic switch with 35Ohm on-state resistance, designed for signal routing and multiplexing applications requiring fast switching times and low leakage current.

The DG418DY-T1 is classified as obsolete. Equivalent and substitute parts are available from active product lines, offering improved compliance status and expanded availability while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO (Single Pole Single Throw - Normally Open)
Multiplexer/Demultiplexer Circuit	1:1
Number of Circuits	1
On-State Resistance (Max)	35Ohm
Voltage - Supply, Single (V+)	12V
Voltage - Supply, Dual (V±)	±15V
Switch Time (Ton, Toff) (Max)	175ns, 145ns
Charge Injection	60pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF
Current - Leakage (IS(off)) (Max)	250pA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DG418DY-T1 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

Switch Circuit: SPST - NO
Multiplexer/Demultiplexer Circuit: 1:1
Number of Circuits: 1
On-State Resistance (Max): 35Ohm
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Electrical Performance Parameters:

Switch Time (Ton, Toff) (Max): 175ns, 145ns
Channel Capacitance (CS(off), CD(off)): 8pF, 8pF
Current - Leakage (IS(off)) (Max): 250pA

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents - Parts meeting all mandatory equivalence parameters with identical electrical specifications. DG418DY-T1-E3 qualifies as a direct parametric equivalent with active product status and improved RoHS3 compliance.

Category 2: Manufacturer Recommended Substitutes - Parts meeting all mandatory equivalence parameters with variations in supply voltage ranges, charge injection, channel-to-channel matching, crosstalk performance, or operating temperature ranges. These parts maintain functional compatibility while offering enhanced electrical characteristics or broader operating conditions.

Parameter Comparison

Parameter	DG418DY-T1	DG418DY-T1-E3	DG418CY+	DG418DY+	DG418LDY+	DG418LDY+T	MAX318CSA+	MAX318ESA+	MAX318ESA+T
Manufacturer	Vishay Siliconix	Vishay Siliconix	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO
On-State Resistance (Max)	35Ohm	35Ohm	35Ohm	35Ohm	35Ohm	35Ohm	35Ohm	35Ohm	35Ohm
Voltage - Supply, Single (V+)	12V	12V	10V ~ 30V	10V ~ 30V	9V ~ 36V	9V ~ 36V	10V ~ 30V	10V ~ 30V	10V ~ 30V
Voltage - Supply, Dual (V±)	±15V	±15V	±4.5V ~ 20V	±4.5V ~ 20V	±4.5V ~ 20V	±4.5V ~ 20V	±4.5V ~ 20V	±4.5V ~ 20V	±4.5V ~ 20V
Switch Time (Ton, Toff) (Max)	175ns, 145ns	175ns, 145ns	175ns, 145ns	175ns, 145ns	175ns, 185ns	175ns, 185ns	175ns, 145ns	175ns, 145ns	175ns, 145ns
Charge Injection	60pC	60pC	3pC	3pC	15pC	15pC	3pC	3pC	3pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF	8pF, 8pF	8pF, 8pF	8pF, 8pF	8pF, 8pF	8pF, 8pF	8pF, 8pF	8pF, 8pF	8pF, 8pF
Current - Leakage (IS(off)) (Max)	250pA	250pA	250pA	250pA	250pA	250pA	250pA	250pA	250pA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Tube	Tape & Reel (TR)	Tube	Tube	Tube	Tube	Tube	Tube	Tape & Reel (TR)
Inventory Status	8522 Pcs	25100 Pcs	4300 Pcs	1900 Pcs	880 Pcs	5100 Pcs	1250 Pcs	843 Pcs	3232 Pcs

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalent): DG418DY-T1-E3 is the recommended direct replacement. It maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. This part is suitable for applications requiring exact parameter matching with improved regulatory compliance.

For Extended Supply Voltage Range Applications: DG418CY+, DG418DY+, DG418LDY+, DG418LDY+T, MAX318CSA+, MAX318ESA+, and MAX318ESA+T support broader supply voltage ranges (9V ~ 36V single supply or ±4.5V ~ 20V dual supply) compared to the original 12V/±15V specification. These parts are suitable for designs requiring flexible power supply configurations.

For Low-Temperature Extended Range: DG418DY+, DG418LDY+, DG418LDY+T, MAX318ESA+, and MAX318ESA+T maintain the full -40°C ~ 85°C operating temperature range of the original part. DG418CY+ and MAX318CSA+ operate within 0°C ~ 70°C and are not suitable for extended low-temperature applications.

For Improved Charge Injection Performance: DG418CY+, DG418DY+, MAX318CSA+, MAX318ESA+, and MAX318ESA+T offer reduced charge injection (3pC) compared to the original 60pC specification, providing superior signal fidelity in precision analog switching applications.

For Packaging Considerations: DG418DY-T1-E3 and MAX318ESA+T are available in Tape & Reel (TR) packaging for automated assembly. All other substitutes are supplied in Tube packaging. Select based on manufacturing process requirements.

For Regulatory Compliance: All substitute parts are ROHS3 compliant, addressing the non-compliant status of the original DG418DY-T1. This is mandatory for applications subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can DG418DY-T1-E3 be used as a direct drop-in replacement for DG418DY-T1? A: Yes. DG418DY-T1-E3 is a parametric equivalent with identical electrical specifications, package configuration, and pin assignment. The primary differences are active product status and ROHS3 compliance.

Q: What is the key difference between DG418DY-T1 and the Analog Devices/Maxim substitutes? A: The Analog Devices/Maxim parts (DG418CY+, DG418DY+, DG418LDY+, MAX318CSA+, MAX318ESA+) offer broader supply voltage ranges and reduced charge injection. The DG418 series maintains the same base electrical characteristics, while the MAX318 series uses a different base product number but maintains functional equivalence.

Q: Are all substitute parts compatible with the original 12V/±15V supply voltages? A: Yes. All substitute parts support the original 12V single supply and ±15V dual supply specifications. However, DG418CY+ and MAX318CSA+ are limited to 0°C ~ 70°C operating temperature and should not be used in applications requiring -40°C operation.

Q: What is the significance of the charge injection difference between DG418DY-T1 (60pC) and DG418CY+ (3pC)? A: Charge injection affects signal settling time and accuracy in precision analog switching applications. Lower charge injection (3pC) provides faster settling and reduced signal distortion. The original 60pC specification is acceptable for general-purpose switching; lower values are beneficial for high-precision signal routing.

Q: Can I use MAX318ESA+ in place of DG418DY-T1 in a -40°C application? A: Yes. MAX318ESA+ supports the full -40°C ~ 85°C operating temperature range and is suitable for extended low-temperature applications. MAX318CSA+ is not suitable for temperatures below 0°C.

Q: What packaging options are available for automated assembly? A: DG418DY-T1-E3 and MAX318ESA+T are supplied in Tape & Reel (TR) packaging for automated pick-and-place assembly. All other substitutes are supplied in Tube packaging, which requires manual handling or reel conversion.

Q: Are there any crosstalk or channel-to-channel matching differences I should consider? A: DG418CY+, DG418DY+, MAX318CSA+, MAX318ESA+, and MAX318ESA+T specify crosstalk performance (-85dB @ 1MHz) and improved channel-to-channel matching (2Ohm ~ 3Ohm max). The original DG418DY-T1 and DG418LDY+ do not specify these parameters. For applications sensitive to crosstalk, the Analog Devices/Maxim parts with specified crosstalk are preferred.

Q: Is the DG418DY-T1 still available for new designs? A: No. The DG418DY-T1 is classified as obsolete. DG418DY-T1-E3 is the recommended replacement for new designs, offering active product status and improved compliance.

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