DG409LDY-T1-E3 Equivalent & Substitute Parts

Part Overview

The DG409LDY-T1-E3 is a dual-circuit SP4T (single-pole, four-throw) analog switch manufactured by Vishay Siliconix in 16-SOIC surface mount packaging. This interface IC features 29Ω on-state resistance and operates across 2V to 12V single supply or ±3V to ±6V dual supply configurations. The device is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and production continuity. Substitute parts must maintain functional compatibility through matching switch topology, circuit count, and electrical performance within acceptable parameter ranges.

Key Parameters

Parameter	DG409LDY-T1-E3
Switch Circuit	SP4T
Number of Circuits	2
Multiplexer/Demultiplexer Circuit	4:1
On-State Resistance (Max)	29Ω
Channel-to-Channel Matching (ΔRon)	1Ω
Voltage - Supply, Single (V+)	2V ~ 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
Package / Case	16-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following criteria:

Primary Compatibility Requirements:

Switch topology: SP4T (single-pole, four-throw)
Circuit count: 2 circuits
Multiplexer configuration: 4:1
Mounting type: Surface mount
Package family: 16-pin SOIC or TSSOP variants
RoHS3 compliance and MSL 1 rating

Electrical Parameter Ranges for Substitution:

On-state resistance: Must not exceed application requirements; lower resistance values are acceptable
Supply voltage ranges: Must encompass or exceed the original 2V–12V single supply and ±3V–±6V dual supply specifications
Operating temperature: Must cover -40°C to 85°C minimum
Leakage current: Lower values are acceptable; higher values require application-specific evaluation
Crosstalk and charge injection: Lower values indicate improved performance

Packaging Considerations:

16-SOIC (0.154", 3.90mm) packages are pin-compatible with the original device
16-TSSOP (0.173", 4.40mm) packages require PCB layout verification due to different pitch and body dimensions

Substitute parts are grouped by on-state resistance performance tier and supply voltage capability to facilitate selection based on application requirements.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	Supply Single (V+)	Supply Dual (V±)	Operating Temp	Package	Product Status
DG409LDY-T1-E3	Vishay Siliconix	29Ω	2V ~ 12V	±3V ~ 6V	-40°C ~ 85°C	16-SOIC	Obsolete
DG409LEDQ-T1-GE3	Vishay Siliconix	23Ω	3V ~ 16V	±3.3V ~ 8V	-40°C ~ 85°C	16-TSSOP	Active
ADG1209YRZ	Analog Devices Inc.	200Ω	5V ~ 16.5V	±5V ~ 16.5V	-40°C ~ 125°C	16-SOIC	Active
ADG1209YRZ-REEL7	Analog Devices Inc.	200Ω	5V ~ 16.5V	±5V ~ 16.5V	-40°C ~ 125°C	16-SOIC	Active
ADG1309BRZ-REEL7	Analog Devices Inc.	210Ω	5V ~ 16.5V	±5V ~ 16.5V	-40°C ~ 105°C	16-SOIC	Active
ADG409BRZ	Analog Devices Inc.	100Ω	12V	±15V	-40°C ~ 85°C	16-SOIC	Active
ADG409BRZ-REEL	Analog Devices Inc.	100Ω	12V	±15V	-40°C ~ 85°C	16-SOIC	Active
ADG409BRZ-REEL7	Analog Devices Inc.	100Ω	12V	±15V	-40°C ~ 85°C	16-SOIC	Active
DG409CY+	Analog Devices Inc./Maxim Integrated	100Ω	5V ~ 30V	±5V ~ 20V	0°C ~ 70°C	16-SOIC	Active
DG409CY+T	Analog Devices Inc./Maxim Integrated	100Ω	5V ~ 30V	±5V ~ 20V	0°C ~ 70°C	16-SOIC	Active
DG409DY+	Analog Devices Inc./Maxim Integrated	100Ω	5V ~ 30V	±5V ~ 20V	-40°C ~ 85°C	16-SOIC	Active

Engineering Selection Recommendations

Tier 1: Direct Replacement (Preferred)

DG409LEDQ-T1-GE3 (Vishay Siliconix) is the manufacturer-recommended direct substitute. It maintains the same base product architecture (DG409 family), achieves lower on-state resistance (23Ω vs. 29Ω), and extends supply voltage range to 3V–16V single and ±3.3V–8V dual. Operating temperature range matches the original (-40°C to 85°C). The 16-TSSOP package requires PCB layout verification but provides superior electrical performance. Product status is active with 6200 units in stock.

Tier 2: Pin-Compatible SOIC Alternatives

DG409DY+ (Analog Devices Inc./Maxim Integrated) provides 16-SOIC pin compatibility with the original device. It features 100Ω on-state resistance, extended supply voltage range (5V–30V single, ±5V–20V dual), and full temperature range coverage (-40°C to 85°C). This part is suitable for applications where SOIC packaging is mandatory and supply voltages remain within 5V–30V bounds.

ADG409BRZ, ADG409BRZ-REEL, and ADG409BRZ-REEL7 (Analog Devices Inc.) offer 16-SOIC compatibility with 100Ω on-state resistance. These parts operate at fixed 12V single supply or ±15V dual supply, limiting applicability to designs with these specific voltage rails. Operating temperature range matches the original (-40°C to 85°C).

Tier 3: Higher Resistance Alternatives

ADG1209YRZ and ADG1209YRZ-REEL7 (Analog Devices Inc.) feature 200Ω on-state resistance in 16-SOIC packaging. These parts extend operating temperature to -40°C to 125°C and support 5V–16.5V single or ±5V–16.5V dual supplies. Selection is appropriate for applications tolerating higher on-state resistance and requiring extended temperature range.

ADG1309BRZ-REEL7 (Analog Devices Inc.) provides 210Ω on-state resistance with 16-SOIC compatibility, 5V–16.5V single or ±5V–16.5V dual supply, and -40°C to 105°C operating range.

Compliance and Availability

All substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original device. All parts are active products with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can DG409LEDQ-T1-GE3 replace DG409LDY-T1-E3 directly on the PCB?

A: DG409LEDQ-T1-GE3 uses 16-TSSOP packaging versus the original 16-SOIC. While pin count and function are identical, the package body dimensions differ (0.173" vs. 0.154" width). PCB layout verification is required to confirm pad spacing and clearance compatibility. Electrical performance is superior, with lower on-state resistance (23Ω vs. 29Ω) and improved crosstalk (-109dB vs. -82dB @ 100kHz).

Q: What is the difference between ADG409BRZ, ADG409BRZ-REEL, and ADG409BRZ-REEL7?

A: These three part numbers are electrically identical with 100Ω on-state resistance and 16-SOIC packaging. The suffix indicates packaging format: tube (standard), cut tape with Digi-Reel (REEL), or cut tape with Digi-Reel 7-inch (REEL7). Selection depends on procurement and assembly requirements. All three are active products with confirmed inventory.

Q: Why do some substitutes have higher on-state resistance than the original?

A: ADG1209 and ADG1309 series parts (200Ω–210Ω) prioritize extended supply voltage range (5V–16.5V) and improved temperature performance (-40°C to 125°C or 105°C). Higher on-state resistance is acceptable in applications where signal attenuation is not critical and supply voltage flexibility is required. Lower resistance alternatives (DG409DY+, ADG409BRZ series at 100Ω) are preferred for low-impedance signal paths.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original DG409LDY-T1-E3 specification.

Q: Which substitute is best for applications requiring -40°C to 85°C operation?

A: DG409LEDQ-T1-GE3, DG409DY+, ADG409BRZ series, and ADG1309BRZ-REEL7 all support the full -40°C to 85°C range. DG409LEDQ-T1-GE3 is preferred for lowest on-state resistance (23Ω). DG409DY+ is preferred for extended supply voltage range (5V–30V). ADG409BRZ series is suitable for fixed 12V/±15V supply designs.

Q: Can DG409CY+ or DG409CY+T be used as substitutes?

A: DG409CY+ and DG409CY+T are electrically compatible with 100Ω on-state resistance and 16-SOIC packaging. However, operating temperature range is limited to 0°C–70°C, which does not cover the original -40°C specification. These parts are suitable only for applications with relaxed low-temperature requirements.

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