DG408LDY Equivalent & Substitute Parts

Part Overview

The DG408LDY is an 8:1 analog multiplexer/demultiplexer IC manufactured by Vishay Siliconix in 16-SOIC surface mount packaging. This device features a single circuit configuration with 29Ohm on-state resistance and operates across supply voltages of 2.7V to 12V (single supply) or ±3V to ±6V (dual supply). The DG408LDY is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility through matching multiplexer configuration, package type, and operating temperature range while accommodating variations in on-state resistance and supply voltage specifications.

Key Parameters

Parameter	DG408LDY
Multiplexer/Demultiplexer Circuit	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)
RoHS Status	RoHS non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the DG408LDY is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Multiplexer configuration: 8:1 (single circuit)
Package type: 16-SOIC surface mount
Operating temperature range: Must support -40°C to 85°C minimum
Supply voltage compatibility: Single supply 2.7V to 12V or dual supply ±3V to ±6V

Acceptable Variation Parameters:

On-state resistance: DG408LDY specifies 29Ohm maximum; substitutes with higher resistance (100Ohm, 200Ohm) are acceptable for applications where channel resistance does not impact circuit performance
Channel-to-channel matching: Variations in ΔRon are acceptable provided the substitute meets the application's crosstalk and signal integrity requirements
Switch timing: Substitutes with longer switch times (95ns, 150ns) are acceptable for non-time-critical applications
Charge injection and capacitance: Variations are acceptable provided signal fidelity requirements are met

Substitute parts are grouped by on-state resistance class: 100Ohm devices (ADG408BRZ series, DG408CY+, DG408DY+, DG408DYZ) and 200Ohm devices (ADG1208YRZ series).

Parameter Comparison

Parameter	DG408LDY	ADG1208YRZ	ADG1208YRZ-REEL7	ADG408BRZ	ADG408BRZ-REEL	ADG408BRZ-REEL7	DG408CY+	DG408CY+T	DG408DY+	DG408DY+T	DG408DYZ
Multiplexer/Demultiplexer Circuit	8:1	8:1	8:1	8:1	8:1	8:1	8:1	8:1	8:1	8:1	8:1
Number of Circuits	1	1	1	1	1	1	1	1	1	1	1
On-State Resistance (Max)	29Ohm	200Ohm	200Ohm	100Ohm	100Ohm	100Ohm	100Ohm	100Ohm	100Ohm	100Ohm	100Ohm
Voltage - Supply, Single (V+)	2.7V ~ 12V	5V ~ 16.5V	5V ~ 16.5V	12V	12V	12V	5V ~ 30V	5V ~ 30V	5V ~ 30V	5V ~ 30V	5V ~ 34V
Voltage - Supply, Dual (V±)	±3V ~ 6V	±5V ~ 16.5V	±5V ~ 16.5V	±15V	±15V	±15V	±5V ~ 20V	±5V ~ 20V	±5V ~ 20V	±5V ~ 20V	±5V ~ 20V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance, addressing the obsolescence and regulatory status of the DG408LDY. Selection between substitute options depends on application-specific requirements:

For applications requiring lowest on-state resistance closest to the original 29Ohm specification: The DG408LDY series (DG408CY+, DG408CY+T, DG408DY+, DG408DY+T, DG408DYZ) with 100Ohm maximum resistance provides the best match. DG408DY+ and DG408DY+T support the full -40°C to 85°C operating temperature range matching the original part.

For applications with extended temperature requirements: ADG1208YRZ and ADG1208YRZ-REEL support -40°C to 125°C operation, providing additional thermal margin. These devices operate at 200Ohm on-state resistance and require minimum 5V single supply or ±5V dual supply.

For applications with standard temperature range and moderate resistance tolerance: ADG408BRZ, ADG408BRZ-REEL, and ADG408BRZ-REEL7 provide 100Ohm on-state resistance with -40°C to 85°C operation. These devices require 12V single supply or ±15V dual supply.

For applications with relaxed temperature requirements (0°C to 70°C): DG408CY+ and DG408CY+T offer 100Ohm resistance with the widest single supply range (5V to 30V) and dual supply range (±5V to ±20V).

All substitute parts maintain 16-SOIC packaging compatibility and 8:1 multiplexer configuration. Packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) are available to match procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher on-state resistance than the DG408LDY?

A: Yes, provided the application does not require the lowest possible channel resistance. The DG408LDY specifies 29Ohm maximum; substitutes with 100Ohm or 200Ohm on-state resistance are functionally compatible for 8:1 multiplexing applications where channel resistance does not degrade signal integrity or introduce unacceptable voltage drops.

Q: What is the key difference between ADG408BRZ and DG408DY+ substitutes?

A: Both are 100Ohm 8:1 multiplexers in 16-SOIC packaging with -40°C to 85°C operation. ADG408BRZ requires fixed 12V single supply or ±15V dual supply. DG408DY+ supports wider supply ranges (5V to 30V single, ±5V to ±20V dual), providing greater design flexibility for applications with variable supply voltages.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitutes are ROHS3 compliant, addressing the RoHS non-compliant status of the obsolete DG408LDY. This compliance is mandatory for new designs and production in regulated markets.

Q: Can I interchange packaging variants of the same part number?

A: Packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) of the same base part number are electrically identical. Selection depends on procurement quantity, assembly equipment compatibility, and inventory management requirements. For example, ADG408BRZ (Tube), ADG408BRZ-REEL (Cut Tape & Digi-Reel), and ADG408BRZ-REEL7 (Cut Tape & Digi-Reel) are functionally equivalent.

Q: What supply voltage range should I use for substitution?

A: The DG408LDY operates at 2.7V to 12V single supply or ±3V to ±6V dual supply. Most substitutes require higher minimum voltages (5V single, ±5V dual). Verify that your application's supply voltage falls within the substitute part's specified range. DG408DY+ and DG408CY+ offer the widest supply ranges among substitutes.

Q: Is temperature range compatibility critical for substitution?

A: Yes. The DG408LDY operates from -40°C to 85°C. Substitutes with narrower ranges (DG408CY+, DG408CY+T: 0°C to 70°C) are not suitable for applications requiring full -40°C to 85°C operation. ADG1208YRZ series extends to 125°C, providing additional margin for high-temperature environments.

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