DG408DY Equivalent & Substitute Parts

Part Overview

The DG408DY is an 8:1 analog multiplexer/demultiplexer IC manufactured by Vishay Siliconix, housed in a 16-SOIC surface mount package. This part features 100Ohm on-state resistance and operates across a wide supply voltage range (5V to 36V single supply, or ±5V to ±20V dual supply). The DG408DY is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Multiplexer/Demultiplexer Circuit	8:1
Number of Circuits	1
On-State Resistance (Max)	100Ohm
Channel-to-Channel Matching (ΔRon)	15Ohm (Max)
Voltage - Supply, Single (V+)	5V ~ 36V
Voltage - Supply, Dual (V±)	±5V ~ 20V
Switch Time (Ton, Toff) (Max)	150ns, 150ns
Charge Injection	20pC
Channel Capacitance (CS(off), CD(off))	3pF, 26pF
Current - Leakage (IS(off)) (Max)	500pA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-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 for the DG408DY is determined by the following critical parameters:

Primary Substitution Criteria:

Multiplexer/Demultiplexer configuration: 8:1 topology
Package type: 16-SOIC surface mount form factor
On-state resistance: 100Ohm nominal specification
Supply voltage compatibility: Single supply 5V to 36V or dual supply ±5V to ±20V
Operating temperature range: -40°C to 85°C minimum

Substitute Categories:

Direct Equivalent (Pin-Compatible, Identical Specifications): DG408DY-E3 is a direct equivalent with identical electrical specifications and 16-SOIC packaging. The primary distinction is product status (active vs. obsolete) and RoHS compliance (ROHS3 compliant vs. non-compliant).

Functional Equivalents (8:1 Multiplexer, 100Ohm Ron, 16-SOIC): ADG408BRZ, ADG408BRZ-REEL, and ADG408BRZ-REEL7 from Analog Devices provide 8:1 multiplexing with 100Ohm on-state resistance in 16-SOIC packaging. These parts maintain the same channel-to-channel matching specification (15Ohm max) and charge injection (20pC). Supply voltage specifications differ: 12V single supply and ±15V dual supply. Operating temperature range matches (-40°C to 85°C).

DG408CY+, DG408CY+T, and DG408DY+ (Analog Devices/Maxim Integrated) offer enhanced performance with 100Ohm on-state resistance but improved channel-to-channel matching (1.5Ohm vs. 15Ohm) and reduced charge injection (2pC vs. 20pC). Supply voltage range is broader (5V to 30V single supply, ±5V to ±20V dual supply). DG408CY+ and DG408CY+T operate at 0°C to 70°C; DG408DY+ extends to -40°C to 85°C.

Higher On-State Resistance Alternatives (8:1 Multiplexer, 16-SOIC): ADG1208YRZ and ADG1208YRZ-REEL7 feature 200Ohm on-state resistance with superior performance metrics: 4.6Ohm channel-to-channel matching, 0.4pC charge injection, 550MHz -3dB bandwidth, and -85dB crosstalk @ 1MHz. Supply voltage is limited to 5V to 16.5V single supply or ±5V to 16.5V dual supply. Operating temperature extends to -40°C to 125°C.

ADG1308BRZ-REEL7 provides 210Ohm on-state resistance with 5Ohm channel-to-channel matching, 2pC charge injection, 500MHz -3dB bandwidth, and -80dB crosstalk @ 1MHz. Supply voltage range is 5V to 16.5V single supply or ±5V to 16.5V dual supply. Operating temperature is -40°C to 105°C.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ron (Max)	ΔRon (Max)	V+ Supply	V± Supply	Ton/Toff (Max)	Charge Injection	Temp Range	RoHS Status	Packaging
DG408DY	Vishay Siliconix	Obsolete	100Ohm	15Ohm	5V ~ 36V	±5V ~ 20V	150ns, 150ns	20pC	-40°C ~ 85°C	Non-compliant	Tube
DG408DY-E3	Vishay Siliconix	Active	100Ohm	15Ohm	5V ~ 36V	±5V ~ 20V	150ns, 150ns	20pC	-40°C ~ 85°C	ROHS3 Compliant	Tube
ADG408BRZ	Analog Devices	Active	100Ohm	15Ohm	12V	±15V	—	20pC	-40°C ~ 85°C	ROHS3 Compliant	Tube
ADG408BRZ-REEL	Analog Devices	Active	100Ohm	15Ohm	12V	±15V	—	20pC	-40°C ~ 85°C	ROHS3 Compliant	CT & Digi-Reel
ADG408BRZ-REEL7	Analog Devices	Active	100Ohm	15Ohm	12V	±15V	—	20pC	-40°C ~ 85°C	ROHS3 Compliant	CT & Digi-Reel
DG408CY+	Analog Devices/Maxim	Active	100Ohm	1.5Ohm	5V ~ 30V	±5V ~ 20V	150ns, 150ns	2pC	0°C ~ 70°C	ROHS3 Compliant	Tube
DG408CY+T	Analog Devices/Maxim	Active	100Ohm	1.5Ohm	5V ~ 30V	±5V ~ 20V	150ns, 150ns	2pC	0°C ~ 70°C	ROHS3 Compliant	Tape & Reel
DG408DY+	Analog Devices/Maxim	Active	100Ohm	1.5Ohm	5V ~ 30V	±5V ~ 20V	150ns, 150ns	2pC	-40°C ~ 85°C	ROHS3 Compliant	Tube
ADG1208YRZ	Analog Devices	Active	200Ohm	4.6Ohm	5V ~ 16.5V	±5V ~ 16.5V	95ns, 100ns	0.4pC	-40°C ~ 125°C	ROHS3 Compliant	Tube
ADG1208YRZ-REEL7	Analog Devices	Active	200Ohm	4.6Ohm	5V ~ 16.5V	±5V ~ 16.5V	95ns, 100ns	0.4pC	-40°C ~ 125°C	ROHS3 Compliant	CT & Digi-Reel
ADG1308BRZ-REEL7	Analog Devices	Active	210Ohm	5Ohm	5V ~ 16.5V	±5V ~ 16.5V	100ns, 100ns	2pC	-40°C ~ 105°C	ROHS3 Compliant	Tape & Reel

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): DG408DY-E3 is the primary recommendation. It maintains all electrical and thermal specifications of the original DG408DY while offering active product status and ROHS3 compliance. This part is suitable for designs requiring no circuit modifications.

For RoHS-Compliant Designs with Identical Ron and Temperature Range: DG408DY+ (Analog Devices/Maxim Integrated) provides ROHS3 compliance with identical 100Ohm on-state resistance and -40°C to 85°C operating range. Enhanced performance characteristics include improved channel-to-channel matching (1.5Ohm vs. 15Ohm) and reduced charge injection (2pC vs. 20pC). Supply voltage range is broader (5V to 30V single supply). This part is suitable for new designs prioritizing compliance and performance.

For Designs with Restricted Temperature Range (0°C to 70°C): DG408CY+ and DG408CY+T offer identical Ron and enhanced performance metrics but operate only to 70°C maximum. These parts are suitable for commercial-grade applications where extended low-temperature operation is not required.

For Designs with Limited Supply Voltage (12V Single, ±15V Dual): ADG408BRZ, ADG408BRZ-REEL, and ADG408BRZ-REEL7 maintain 100Ohm on-state resistance and identical channel-to-channel matching. These parts are suitable for applications where supply voltage is constrained to 12V single or ±15V dual supply. All variants offer ROHS3 compliance and -40°C to 85°C operation.

For High-Performance Applications Tolerating Higher On-State Resistance: ADG1208YRZ and ADG1208YRZ-REEL7 provide superior performance with 200Ohm on-state resistance, 4.6Ohm channel-to-channel matching, 0.4pC charge injection, 550MHz -3dB bandwidth, and -85dB crosstalk @ 1MHz. Supply voltage is limited to 5V to 16.5V single or ±5V to 16.5V dual supply. Operating temperature extends to 125°C. These parts are suitable for precision analog switching applications where performance metrics outweigh on-state resistance constraints.

For Tape & Reel Packaging Requirements: ADG408BRZ-REEL, ADG408BRZ-REEL7, ADG1208YRZ-REEL7, and ADG1308BRZ-REEL7 provide cut tape and digi-reel packaging options for automated assembly processes.

All recommended substitutes are ROHS3 compliant and carry REACH unaffected status, meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can DG408DY-E3 be used as a direct drop-in replacement for DG408DY? A: Yes. DG408DY-E3 maintains identical electrical specifications, thermal characteristics, and 16-SOIC package dimensions. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the key difference between DG408DY and DG408DY+? A: Both parts feature 100Ohm on-state resistance and -40°C to 85°C operation. DG408DY+ offers improved channel-to-channel matching (1.5Ohm vs. 15Ohm), reduced charge injection (2pC vs. 20pC), and broader supply voltage range (5V to 30V single supply vs. 5V to 36V). DG408DY+ is ROHS3 compliant.

Q: Can ADG408BRZ replace DG408DY in all applications? A: ADG408BRZ maintains 100Ohm on-state resistance, 15Ohm channel-to-channel matching, and -40°C to 85°C operation. However, supply voltage specifications differ: ADG408BRZ operates at 12V single supply and ±15V dual supply, whereas DG408DY operates at 5V to 36V single supply and ±5V to ±20V dual supply. Substitution is valid only if the application's supply voltage falls within both specifications.

Q: Why would I choose ADG1208YRZ over DG408DY if Ron is higher? A: ADG1208YRZ (200Ohm Ron) provides superior performance metrics: 4.6Ohm channel-to-channel matching (vs. 15Ohm), 0.4pC charge injection (vs. 20pC), 550MHz -3dB bandwidth, and -85dB crosstalk @ 1MHz. These characteristics are critical for precision analog switching, signal routing in instrumentation, and high-frequency applications where on-state resistance is less constraining than signal integrity.

Q: What packaging options are available for high-volume production? A: Cut tape and digi-reel packaging is available for ADG408BRZ-REEL, ADG408BRZ-REEL7, ADG1208YRZ-REEL7, and ADG1308BRZ-REEL7. Tube packaging is available for ADG408BRZ, DG408CY+, DG408DY+, ADG1208YRZ, and DG408DY-E3. Selection depends on assembly process requirements and volume commitments.

Q: Are all substitute parts RoHS compliant? A: Yes. All recommended substitute parts carry ROHS3 compliance and REACH unaffected status. The original DG408DY is RoHS non-compliant. DG408DY-E3 is the RoHS-compliant variant of the original part.

Q: What is the operating temperature constraint for DG408CY+ and DG408CY+T? A: DG408CY+ and DG408CY+T operate at 0°C to 70°C, which is narrower than the original DG408DY (-40°C to 85°C). These parts are suitable for commercial-grade applications but not for extended low-temperature or high-temperature industrial environments. DG408DY+ extends operation to -40°C to 85°C while maintaining enhanced performance characteristics.

Q: Can I use ADG1308BRZ-REEL7 in place of DG408DY? A: ADG1308BRZ-REEL7 provides 8:1 multiplexing in 16-SOIC packaging with 210Ohm on-state resistance. Supply voltage is limited to 5V to 16.5V single or ±5V to 16.5V dual supply. Substitution is valid only if the application tolerates higher on-state resistance and operates within the specified supply voltage range. Operating temperature extends to 105°C, exceeding the original part's 85°C maximum.

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