DG408LDY-T1 Equivalent & Substitute Parts

Part Overview

The DG408LDY-T1 is a single-circuit 8:1 multiplexer/demultiplexer IC manufactured by Vishay Siliconix in 16-SOIC surface mount packaging. This part operates with single supply voltage (2.7V to 12V) or dual supply voltage (±3V to ±6V), featuring 29Ohm on-state resistance and 55ns/25ns switching times. The device is classified as obsolete, necessitating identification of active substitute components that maintain functional compatibility within system design constraints.

Key Parameters

Parameter	DG408LDY-T1
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)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

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

Circuit Configuration: 8:1 multiplexer/demultiplexer topology with single circuit
Package Compatibility: 16-SOIC surface mount form factor
Supply Voltage Range: Operating voltage envelope must accommodate system requirements
On-State Resistance: Electrical performance in signal path
Switching Characteristics: Ton and Toff parameters for timing-critical applications
Leakage Current: Signal integrity in high-impedance applications
Operating Temperature Range: Thermal operating envelope
RoHS/Compliance Status: Regulatory requirements for new designs

Substitute parts are grouped into three categories based on on-state resistance characteristics and supply voltage specifications:

Group 1 - Low Resistance, Extended Supply Range (100Ohm, ±15V dual supply): ADG408BRZ, ADG408BRZ-REEL, ADG408BRZ-REEL7, DG408CY+, DG408CY+T, DG408DY+, DG408DY+T

Group 2 - Medium Resistance, Extended Supply Range (200Ohm, ±5V to ±16.5V dual supply): ADG1208YRZ, ADG1208YRZ-REEL7

Group 3 - Medium Resistance, Extended Supply Range (210Ohm, ±5V to ±16.5V dual supply): ADG1308BRZ-REEL7

Parameter Comparison

Parameter	DG408LDY-T1	ADG408BRZ	ADG408BRZ-REEL	ADG408BRZ-REEL7	DG408CY+	DG408CY+T	DG408DY+	DG408DY+T	ADG1208YRZ	ADG1208YRZ-REEL7	ADG1308BRZ-REEL7
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	100Ohm	100Ohm	100Ohm	100Ohm	100Ohm	100Ohm	100Ohm	200Ohm	200Ohm	210Ohm
Channel-to-Channel Matching (ΔRon)	1Ohm	15Ohm (Max)	15Ohm (Max)	15Ohm (Max)	1.5Ohm	1.5Ohm	1.5Ohm	1.5Ohm	3.5Ohm	3.5Ohm	5Ohm
Voltage - Supply, Single (V+)	2.7V ~ 12V	12V	12V	12V	5V ~ 30V	5V ~ 30V	5V ~ 30V	5V ~ 30V	5V ~ 16.5V	5V ~ 16.5V	5V ~ 16.5V
Voltage - Supply, Dual (V±)	±3V ~ 6V	±15V	±15V	±15V	±5V ~ 20V	±5V ~ 20V	±5V ~ 20V	±5V ~ 20V	±5V ~ 16.5V	±5V ~ 16.5V	±5V ~ 16.5V
Switch Time (Ton, Toff) (Max)	55ns, 25ns	—	—	—	150ns, 150ns	150ns, 150ns	150ns, 150ns	150ns, 150ns	95ns, 100ns	95ns, 100ns	100ns, 100ns
Charge Injection	1pC	20pC	20pC	20pC	2pC	2pC	2pC	2pC	0.4pC	0.4pC	2pC
Channel Capacitance (CS(off), CD(off))	7pF, 20pF	11pF, 40pF	11pF, 40pF	11pF, 40pF	3pF, 26pF	3pF, 26pF	3pF, 26pF	3pF, 26pF	1.5pF, 7pF	1.5pF, 7pF	15pF, 20pF
Current - Leakage (IS(off)) (Max)	1nA	500pA	500pA	500pA	500pA	500pA	500pA	500pA	100pA	100pA	1nA
Crosstalk	-82dB @ 100kHz	-85dB @ 100kHz	-85dB @ 100kHz	-85dB @ 100kHz	-92dB @ 100kHz	-92dB @ 100kHz	-92dB @ 100kHz	-92dB @ 100kHz	-85dB @ 1MHz	-85dB @ 1MHz	-80dB @ 1MHz
Operating Temperature	-40°C ~ 85°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 ~ 125°C	-40°C ~ 125°C	-40°C ~ 105°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
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
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

Engineering Selection Recommendations

All substitute parts listed are active components with ROHS3 compliance, addressing the obsolescence and regulatory limitations of the DG408LDY-T1.

For applications requiring minimal on-state resistance and low charge injection: DG408DY+T and DG408DY+ offer 100Ohm resistance with 2pC charge injection, extended supply voltage range (5V to 30V single, ±5V to ±20V dual), and operating temperature range of -40°C to 85°C matching the original part's thermal envelope.

For applications with extended operating temperature requirements: ADG1208YRZ and ADG1208YRZ-REEL7 support -40°C to 125°C operation with 200Ohm on-state resistance, 0.4pC charge injection, and extended supply voltage range (5V to 16.5V single, ±5V to ±16.5V dual).

For applications requiring moderate resistance with extended temperature range: ADG1308BRZ-REEL7 provides 210Ohm on-state resistance, 2pC charge injection, and -40°C to 105°C operating temperature with 5V to 16.5V single supply and ±5V to ±16.5V dual supply capability.

For cost-optimized solutions with standard temperature range: ADG408BRZ, ADG408BRZ-REEL, and ADG408BRZ-REEL7 deliver 100Ohm on-state resistance with 12V single supply and ±15V dual supply, maintaining -40°C to 85°C operating temperature.

Frequently Asked Questions (FAQ)

Q: Can DG408DY+T directly replace DG408LDY-T1 in existing designs?

A: DG408DY+T maintains the same 8:1 multiplexer topology, 16-SOIC package, and -40°C to 85°C operating temperature range. However, on-state resistance increases from 29Ohm to 100Ohm, and supply voltage range expands from 2.7V-12V (single) to 5V-30V (single). Circuit designs dependent on the lower resistance or lower minimum supply voltage require evaluation.

Q: What is the primary difference between ADG1208YRZ and ADG1308BRZ-REEL7?

A: Both are 8:1 multiplexers in 16-SOIC packaging with extended supply ranges. ADG1208YRZ features 200Ohm on-state resistance, 0.4pC charge injection, and -40°C to 125°C operation. ADG1308BRZ-REEL7 provides 210Ohm on-state resistance, 2pC charge injection, and -40°C to 105°C operation. Selection depends on temperature range requirements and charge injection sensitivity.

Q: Are all substitute parts available in equivalent packaging options?

A: Substitute parts are available in multiple packaging formats: Tube, Cut Tape (CT) & Digi-Reel, and Tape & Reel (TR). DG408DY+T is supplied in Cut Tape & Digi-Reel format with 16,880 pieces in stock. ADG408BRZ-REEL7 is available in Cut Tape & Digi-Reel format with 15,200 pieces in stock. Packaging selection should align with assembly process requirements.

Q: How does on-state resistance affect circuit performance?

A: On-state resistance determines signal attenuation and power dissipation in the multiplexer signal path. The DG408LDY-T1 specifies 29Ohm maximum resistance. Substitute parts range from 100Ohm to 210Ohm. Applications with low-impedance signal sources or high-frequency operation may require circuit redesign to accommodate increased resistance. Channel-to-channel matching (ΔRon) also affects crosstalk performance between multiplexed channels.

Q: What compliance advantages do substitute parts provide?

A: All substitute parts are ROHS3 compliant, addressing environmental and regulatory requirements for new product designs. The original DG408LDY-T1 is RoHS non-compliant. Substitute parts also feature active product status, ensuring long-term availability and manufacturer support compared to the obsolete original component.

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