DG408LDY-T1-E3 Equivalent & Substitute Parts

Part Overview

The DG408LDY-T1-E3 is an 8:1 analog multiplexer/demultiplexer IC manufactured by Vishay Siliconix in 16-SOIC surface mount packaging. This part features a maximum on-state resistance of 29Ohm with single supply operation from 2.7V to 12V or dual supply operation from ±3V to ±6V. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional compatibility through matching multiplexer configuration, package type, and electrical operating ranges while accommodating variations in on-state resistance and switching characteristics.

Key Parameters

Parameter	DG408LDY-T1-E3
Multiplexer Configuration	8:1
Number of Circuits	1
On-State Resistance (Max)	29Ohm
Channel-to-Channel Matching (ΔRon)	1Ohm
Voltage - Supply, Single (V+)	2.7V ~ 12V
Voltage - Supply, Dual (V±)	±3V ~ 6V
Switch Time (Ton, Toff) (Max)	55ns, 25ns
Charge Injection	1pC
Channel Capacitance (CS(off), CD(off))	7pF, 20pF
Current - Leakage (IS(off)) (Max)	1nA
Crosstalk	-82dB @ 100kHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the DG408LDY-T1-E3 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Multiplexer configuration: 8:1
Package type: 16-SOIC surface mount
Number of circuits: 1
Mounting type: Surface mount
RoHS and environmental compliance: ROHS3 Compliant, MSL 1

Allowable Variation Parameters:

On-state resistance: Substitutes may have lower resistance values (improved performance)
Supply voltage ranges: Substitutes must support the application's required voltage range; wider ranges are acceptable
Switch time: Faster switching is acceptable for most applications
Charge injection and crosstalk: Lower values indicate improved performance
Operating temperature: Extended ranges are acceptable

Substitute Categories:

Category 1 - Direct Vishay Siliconix Replacement (Same Base Product): DG408LEDY-T1-GE3 maintains the DG408 base product family with improved on-state resistance (23Ohm) and enhanced electrical characteristics while preserving package compatibility and compliance requirements.

Category 2 - Analog Devices ADG1208 Series (Low Resistance, High Performance): ADG1208YRZ and ADG1208YRZ-REEL7 provide 200Ohm on-state resistance with extended supply voltage ranges (5V ~ 16.5V single, ±5V ~ 16.5V dual) and superior bandwidth performance (550MHz). These are suitable for applications requiring higher supply voltages and lower impedance paths.

Category 3 - Analog Devices ADG1308 Series (Moderate Resistance, Balanced Performance): ADG1308BRZ-REEL7 offers 210Ohm on-state resistance with 500MHz bandwidth and extended temperature range (-40°C ~ 105°C), suitable for applications requiring moderate impedance with enhanced thermal performance.

Category 4 - Analog Devices ADG408 Series (100Ohm Standard): ADG408BRZ, ADG408BRZ-REEL, and ADG408BRZ-REEL7 provide 100Ohm on-state resistance with fixed supply requirements (12V single, ±15V dual) and are suitable for applications with established power supply infrastructure.

Category 5 - Maxim Integrated DG408 Variants (Extended Supply Range): DG408CY+, DG408CY+T, and DG408DY+ offer 100Ohm on-state resistance with extended single supply range (5V ~ 30V) and dual supply range (±5V ~ 20V), providing maximum flexibility for diverse application requirements.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	V+ Supply Range	V± Supply Range	Switch Time Ton/Toff (Max)	Charge Injection	Operating Temp	Package	Product Status
DG408LDY-T1-E3	Vishay Siliconix	29Ohm	2.7V ~ 12V	±3V ~ 6V	55ns, 25ns	1pC	-40°C ~ 85°C	16-SOIC	Obsolete
DG408LEDY-T1-GE3	Vishay Siliconix	23Ohm	3V ~ 16V	±3V ~ 8V	72ns, 47ns	-11pC	-40°C ~ 85°C	16-SOIC	Active
ADG1208YRZ	Analog Devices Inc.	200Ohm	5V ~ 16.5V	±5V ~ 16.5V	95ns, 100ns	0.4pC	-40°C ~ 125°C	16-SOIC	Active
ADG1208YRZ-REEL7	Analog Devices Inc.	200Ohm	5V ~ 16.5V	±5V ~ 16.5V	95ns, 100ns	0.4pC	-40°C ~ 125°C	16-SOIC	Active
ADG1308BRZ-REEL7	Analog Devices Inc.	210Ohm	5V ~ 16.5V	±5V ~ 16.5V	100ns, 100ns	2pC	-40°C ~ 105°C	16-SOIC	Active
ADG408BRZ	Analog Devices Inc.	100Ohm	12V	±15V	—	20pC	-40°C ~ 85°C	16-SOIC	Active
ADG408BRZ-REEL	Analog Devices Inc.	100Ohm	12V	±15V	—	20pC	-40°C ~ 85°C	16-SOIC	Active
ADG408BRZ-REEL7	Analog Devices Inc.	100Ohm	12V	±15V	—	20pC	-40°C ~ 85°C	16-SOIC	Active
DG408CY+	Analog Devices Inc./Maxim Integrated	100Ohm	5V ~ 30V	±5V ~ 20V	150ns, 150ns	2pC	0°C ~ 70°C	16-SOIC	Active
DG408CY+T	Analog Devices Inc./Maxim Integrated	100Ohm	5V ~ 30V	±5V ~ 20V	150ns, 150ns	2pC	0°C ~ 70°C	16-SOIC	Active
DG408DY+	Analog Devices Inc./Maxim Integrated	100Ohm	5V ~ 30V	±5V ~ 20V	150ns, 150ns	2pC	-40°C ~ 85°C	16-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement: DG408LEDY-T1-GE3 is the preferred substitute for the obsolete DG408LDY-T1-E3. Both parts share the Vishay Siliconix DG408 base product family, identical 16-SOIC packaging, and equivalent operating temperature range (-40°C ~ 85°C). The DG408LEDY-T1-GE3 provides improved on-state resistance (23Ohm vs. 29Ohm) and extended supply voltage ranges, ensuring superior performance in existing circuit designs. Both parts maintain ROHS3 compliance and MSL 1 rating.

Secondary Recommendations - Extended Supply Voltage Applications: For applications requiring supply voltages beyond ±6V dual or 12V single, the Maxim Integrated DG408DY+ offers extended supply ranges (5V ~ 30V single, ±5V ~ 20V dual) with 100Ohm on-state resistance and maintains the full operating temperature range (-40°C ~ 85°C). This part is suitable for designs with diverse power supply requirements while preserving thermal performance specifications.

Alternative for High-Performance Applications: ADG1208YRZ and ADG1208YRZ-REEL7 from Analog Devices provide superior bandwidth performance (550MHz) and extended operating temperature range (-40°C ~ 125°C) with higher on-state resistance (200Ohm). These parts are appropriate for applications where impedance is not a limiting factor and extended temperature operation is required.

Compliance Verification: All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage requirements. All parts are classified as Active products with established supply chains.

Frequently Asked Questions (FAQ)

Q: Can DG408LEDY-T1-GE3 be used as a direct drop-in replacement for DG408LDY-T1-E3?

A: Yes. Both parts share identical 16-SOIC packaging, 8:1 multiplexer configuration, and operating temperature range (-40°C ~ 85°C). The DG408LEDY-T1-GE3 provides improved on-state resistance (23Ohm vs. 29Ohm) and extended supply voltage ranges, making it functionally superior while maintaining electrical compatibility in existing circuit designs.

Q: What is the primary difference between Vishay Siliconix DG408 variants and Analog Devices ADG408/ADG1208 series?

A: The primary differences are on-state resistance values and supply voltage requirements. Vishay DG408 variants operate with lower supply voltages (2.7V ~ 12V single, ±3V ~ 8V dual) and lower on-state resistance (23Ohm ~ 29Ohm). Analog Devices ADG408 series requires fixed higher supply voltages (12V single, ±15V dual) with 100Ohm on-state resistance. ADG1208 series operates at 5V ~ 16.5V single supply with 200Ohm on-state resistance and superior bandwidth (550MHz).

Q: Are there supply voltage compatibility constraints when substituting parts?

A: Yes. The substitute part's supply voltage range must encompass the application's required operating voltages. For example, if an application requires 3V ~ 12V single supply operation, DG408LEDY-T1-GE3 (3V ~ 16V) is compatible, but ADG408BRZ (12V fixed) is not. Verify that the substitute part's minimum and maximum supply voltages bracket the application requirements.

Q: What is the significance of on-state resistance differences between substitute parts?

A: On-state resistance determines the impedance of the signal path through the multiplexer. Lower resistance values (23Ohm, 29Ohm) are preferred for low-impedance signal applications and reduce voltage drops across the switch. Higher resistance values (100Ohm, 200Ohm, 210Ohm) are acceptable for high-impedance applications where signal attenuation is not a limiting factor. Verify that the substitute part's on-state resistance is compatible with the application's impedance requirements.

Q: Do all substitute parts maintain the same operating temperature range as the original DG408LDY-T1-E3?

A: No. The original part operates from -40°C ~ 85°C. DG408LEDY-T1-GE3 maintains this range. ADG1208YRZ extends to -40°C ~ 125°C. DG408CY+ and DG408CY+T operate from 0°C ~ 70°C (narrower range). Verify that the substitute part's operating temperature range encompasses the application's thermal requirements.

Q: Are packaging and mounting considerations identical across all substitute parts?

A: Yes. All substitute parts listed use 16-SOIC (0.154", 3.90mm Width) surface mount packaging with identical pin configurations for the 8:1 multiplexer function. PCB layout and reflow soldering processes remain unchanged. Verify packaging specifications with the substitute part datasheet to confirm pinout compatibility.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. These certifications ensure compatibility with standard manufacturing processes, storage requirements, and environmental regulations. No additional compliance verification is required when substituting between listed parts.

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