DG419LDY Equivalent & Substitute Parts

Part Overview

The DG419LDY is a single-circuit SPDT analog switch manufactured by Vishay Siliconix, designed for signal routing and multiplexing applications in 8-SOIC surface mount packaging. This part operates across a supply voltage range of 2.7V to 12V (single supply) or ±3V to ±6V (dual supply), with a maximum on-state resistance of 20Ohm and switching times of 43ns (Ton) and 31ns (Toff).

The DG419LDY is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and system upgrades. Active alternatives provide improved performance characteristics, enhanced compliance certifications, and greater inventory availability.

Key Parameters

Parameter	DG419LDY	Unit
Switch Circuit	SPDT	—
Multiplexer/Demultiplexer Circuit	2:1	—
Number of Circuits	1	—
On-State Resistance (Max)	20	Ohm
Voltage - Supply, Single (V+)	2.7 ~ 12	V
Voltage - Supply, Dual (V±)	±3 ~ ±6	V
Switch Time (Ton, Toff) (Max)	43, 31	ns
Charge Injection	1	pC
Channel Capacitance (CS(off), CD(off))	5	pF
Current - Leakage (IS(off)) (Max)	1	nA
Crosstalk	-71	dB @ 1MHz
Operating Temperature	-40 ~ 85	°C
Package / Case	8-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 of the DG419LDY is determined by the following critical parameters:

Functional Compatibility:

Switch circuit topology: SPDT (Single-Pole Double-Throw)
Multiplexer configuration: 2:1
Number of circuits: 1
Package type: 8-SOIC surface mount

Electrical Compatibility:

On-state resistance must not exceed application requirements
Supply voltage ranges must encompass the operating conditions of the original design
Operating temperature range must meet or exceed the specified limits
Leakage current and crosstalk performance must be acceptable for signal integrity

Compliance & Availability:

Product status (active vs. obsolete) affects long-term sourcing
RoHS compliance status determines regulatory acceptability
Inventory availability ensures production continuity

Substitute parts are grouped into two categories: direct Vishay Siliconix variants (DG419 series) and cross-manufacturer alternatives (Analog Devices ADG419 series). All substitutes maintain the 8-SOIC package footprint and core SPDT 2:1 switching functionality.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max) [Ohm]	V+ Supply [V]	V± Supply [V]	Operating Temp [°C]	Leakage Current (Max) [pA]	Product Status	RoHS Status
DG419LDY	Vishay Siliconix	20	2.7 ~ 12	±3 ~ ±6	-40 ~ 85	1	Obsolete	Non-compliant
DG419DY-T1-E3	Vishay Siliconix	35	12	±15	-40 ~ 85	250	Active	ROHS3 Compliant
DG419LEDY-GE3	Vishay Siliconix	—	3 ~ 16	—	—	—	Active	ROHS3 Compliant
ADG419BRZ	Analog Devices Inc.	35	12	±15	-40 ~ 125	250	Active	ROHS3 Compliant
ADG419BRZ-REEL	Analog Devices Inc.	35	12	±15	-40 ~ 125	250	Active	ROHS3 Compliant
ADG419BRZ-REEL7	Analog Devices Inc.	35	12	±15	-40 ~ 125	250	Active	ROHS3 Compliant
DG419CY+	Analog Devices Inc./Maxim Integrated	35	10 ~ 30	±4.5 ~ ±20	0 ~ 70	250	Active	ROHS3 Compliant
DG419DY+	Analog Devices Inc./Maxim Integrated	35	10 ~ 30	±4.5 ~ ±20	-40 ~ 85	250	Active	ROHS3 Compliant
DG419DY+T	Analog Devices Inc./Maxim Integrated	35	10 ~ 30	±4.5 ~ ±20	-40 ~ 85	250	Active	ROHS3 Compliant
DG419LDY+	Analog Devices Inc./Maxim Integrated	35	9 ~ 36	±4.5 ~ ±20	-40 ~ 85	250	Active	ROHS3 Compliant
DG419LDY+T	Analog Devices Inc./Maxim Integrated	35	9 ~ 36	±4.5 ~ ±20	-40 ~ 85	250	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Vishay Siliconix DG419 Series):

DG419DY-T1-E3 and DG419LEDY-GE3 maintain manufacturer continuity within the Vishay Siliconix product line. Both parts are active products with ROHS3 compliance, addressing the regulatory limitations of the obsolete DG419LDY. DG419DY-T1-E3 operates at higher supply voltages (12V single, ±15V dual) with increased on-state resistance (35Ohm) and leakage current (250pA). DG419LEDY-GE3 extends the single supply range to 3V–16V, providing broader voltage compatibility.

Cross-Manufacturer Alternatives (Analog Devices ADG419 Series):

ADG419BRZ, ADG419BRZ-REEL, and ADG419BRZ-REEL7 are functionally equivalent to DG419DY-T1-E3 with identical electrical specifications. These parts offer extended operating temperature range (-40°C to 125°C) compared to the original DG419LDY (-40°C to 85°C), providing enhanced thermal performance. All three variants are ROHS3 compliant and active products with high inventory availability.

Extended Supply Voltage Alternatives (DG419DY+, DG419DY+T, DG419LDY+, DG419LDY+T):

These variants support wider supply voltage ranges (10V–30V single supply, ±4.5V–±20V dual supply) and maintain the -40°C to 85°C operating temperature range of the original part. DG419LDY+ and DG419LDY+T offer the broadest single supply range (9V–36V), accommodating automotive and industrial applications with higher voltage tolerance requirements.

Temperature-Limited Alternative (DG419CY+):

DG419CY+ operates within a narrower temperature range (0°C to 70°C) and is suitable only for commercial-grade applications that do not require extended low-temperature operation.

Selection Criteria:

For direct replacement with improved compliance: DG419DY-T1-E3 or DG419LEDY-GE3
For cross-manufacturer sourcing with extended temperature range: ADG419BRZ series
For applications requiring extended supply voltage range: DG419LDY+ or DG419LDY+T
For high-volume production with reel packaging: ADG419BRZ-REEL or ADG419BRZ-REEL7

Frequently Asked Questions (FAQ)

Q: Can DG419LDY be directly replaced with DG419DY-T1-E3?

A: DG419DY-T1-E3 is functionally compatible as a SPDT 2:1 switch in 8-SOIC packaging. However, the on-state resistance increases from 20Ohm to 35Ohm, and supply voltage requirements change from 2.7V–12V (single) to 12V (single) and ±3V–±6V (dual) to ±15V (dual). Circuit design must accommodate these parameter differences.

Q: What is the difference between ADG419BRZ, ADG419BRZ-REEL, and ADG419BRZ-REEL7?

A: All three parts are electrically identical with 35Ohm on-state resistance and -40°C to 125°C operating temperature. The differences are packaging and reel configuration: ADG419BRZ is supplied in tube packaging, while ADG419BRZ-REEL and ADG419BRZ-REEL7 are supplied in cut tape with Digi-Reel format. Selection depends on production volume and assembly equipment compatibility.

Q: Why does DG419LDY+ have a higher on-state resistance (35Ohm) than the original DG419LDY (20Ohm)?

A: DG419LDY+ is a different product variant within the DG419 family, optimized for extended supply voltage range (9V–36V) rather than low on-state resistance. The 35Ohm specification reflects this design trade-off. Applications sensitive to on-state resistance must evaluate circuit performance impact.

Q: Is DG419CY+ suitable for industrial applications?

A: DG419CY+ operates only within 0°C to 70°C, which does not meet industrial temperature requirements (-40°C to 85°C). This part is limited to commercial-grade applications and is not recommended for industrial or automotive use.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant except the original DG419LDY, which is RoHS non-compliant. This compliance improvement is a key advantage of transitioning to active substitute parts.

Q: What packaging options are available for high-volume production?

A: DG419DY+T, DG419LDY+T, ADG419BRZ-REEL, and ADG419BRZ-REEL7 are supplied in cut tape with Digi-Reel packaging, suitable for automated assembly. Tube packaging is available for DG419DY-T1-E3, DG419CY+, DG419DY+, DG419LDY+, and ADG419BRZ.

Q: Can DG419LDY be used in applications requiring -40°C to 125°C operation?

A: No. DG419LDY operates only to 85°C. For extended temperature range to 125°C, use ADG419BRZ, ADG419BRZ-REEL, or ADG419BRZ-REEL7.

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