DG409DY Equivalent & Substitute Parts

Part Overview

The DG409DY is a 2-circuit SP4T analog switch IC manufactured by Renesas Electronics Corporation, housed in a 16-SOIC package. This interface component features 100Ohm on-state resistance and supports dual supply voltages (±5V to ±20V) or single supply (5V to 34V). The DG409DY is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Active alternatives from Analog Devices and Maxim Integrated provide comparable or enhanced performance characteristics while maintaining 16-SOIC package compatibility.

Key Parameters

Parameter	DG409DY Value
Switch Circuit Configuration	SP4T (Single Pole, 4-Throw)
Number of Circuits	2
Multiplexer/Demultiplexer Circuit	4:1
On-State Resistance (Max)	100Ohm
Channel-to-Channel Matching (ΔRon)	15Ohm (Max)
Voltage - Supply, Single (V+)	5V ~ 34V
Voltage - Supply, Dual (V±)	±5V ~ 20V
Switch Time (Ton, Toff) (Max)	150ns, 150ns
Charge Injection	20pC
Channel Capacitance (CS(off), CD(off))	3pF, 14pF
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 DG409DY is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Switch circuit configuration: SP4T with 2 circuits and 4:1 multiplexer/demultiplexer function
Package type: 16-SOIC surface mount only
On-state resistance: 100Ohm nominal (allows ±15Ohm matching tolerance)
Supply voltage compatibility: Single supply 5V–34V or dual supply ±5V–±20V
Operating temperature range: Minimum -40°C to 85°C

Direct Equivalents maintain all electrical parameters within specification limits and are pin-compatible replacements.

Similar Substitutes share the SP4T/4:1/2-circuit topology and 16-SOIC package but may have different on-state resistance values (200Ohm, 210Ohm), modified supply voltage ranges, or enhanced performance characteristics. These require circuit validation to confirm compatibility with the original design intent.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	ΔRon (Max)	V+ Supply	V± Supply	Ton/Toff (Max)	Charge Injection	IS(off) (Max)	Operating Temp	Product Status	RoHS Status
DG409DY	Renesas	100Ohm	15Ohm	5V–34V	±5V–±20V	150ns, 150ns	20pC	500pA	-40°C–85°C	Obsolete	Non-compliant
DG409DYZ	Renesas	100Ohm	15Ohm	5V–34V	±5V–±20V	150ns, 150ns	20pC	500pA	-40°C–85°C	Active	ROHS3 Compliant
DG409DY+	Analog Devices/Maxim	100Ohm	1.5Ohm	5V–30V	±5V–±20V	150ns, 150ns	2pC	500pA	-40°C–85°C	Active	ROHS3 Compliant
ADG409BRZ	Analog Devices	100Ohm	15Ohm	12V	±15V	—	20pC	500pA	-40°C–85°C	Active	ROHS3 Compliant
ADG409BRZ-REEL	Analog Devices	100Ohm	15Ohm	12V	±15V	—	20pC	500pA	-40°C–85°C	Active	ROHS3 Compliant
ADG409BRZ-REEL7	Analog Devices	100Ohm	15Ohm	12V	±15V	—	20pC	500pA	-40°C–85°C	Active	ROHS3 Compliant
DG409CY+	Analog Devices/Maxim	100Ohm	1.5Ohm	5V–30V	±5V–±20V	150ns, 150ns	2pC	500pA	0°C–70°C	Active	ROHS3 Compliant
DG409CY+T	Analog Devices/Maxim	100Ohm	1.5Ohm	5V–30V	±5V–±20V	150ns, 150ns	2pC	500pA	0°C–70°C	Active	ROHS3 Compliant
ADG1209YRZ	Analog Devices	200Ohm	4.6Ohm	5V–16.5V	±5V–±16.5V	95ns, 100ns	0.4pC	100pA	-40°C–125°C	Active	ROHS3 Compliant
ADG1209YRZ-REEL7	Analog Devices	200Ohm	4.6Ohm	5V–16.5V	±5V–±16.5V	95ns, 100ns	0.4pC	100pA	-40°C–125°C	Active	ROHS3 Compliant
ADG1309BRZ-REEL7	Analog Devices	210Ohm	5Ohm	5V–16.5V	±5V–±16.5V	100ns, 100ns	2pC	1nA	-40°C–105°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Preferred for Obsolete Part Mitigation):

DG409DYZ is the active equivalent from Renesas Electronics Corporation. It maintains identical electrical specifications to the DG409DY while achieving ROHS3 compliance and MSL 2 rating. This part is recommended as the primary replacement for existing DG409DY designs requiring continued production support.

DG409DY+ (Analog Devices/Maxim Integrated) provides enhanced performance with improved channel-to-channel matching (1.5Ohm vs. 15Ohm) and reduced charge injection (2pC vs. 20pC). It supports the full -40°C to 85°C operating range and is ROHS3 compliant. This part is suitable for new designs or performance-critical applications.

Conditional Substitutes (Require Circuit Validation):

ADG409BRZ, ADG409BRZ-REEL, and ADG409BRZ-REEL7 (Analog Devices) maintain 100Ohm on-state resistance and identical leakage specifications but operate under restricted supply voltage conditions (12V single supply, ±15V dual supply). These parts are suitable only for designs already constrained to these voltage ranges. All variants are ROHS3 compliant and active products.

DG409CY+ and DG409CY+T (Analog Devices/Maxim Integrated) offer superior electrical performance (1.5Ohm matching, 2pC charge injection) but operate within a narrower temperature range (0°C to 70°C). These parts are appropriate for commercial-grade applications not requiring the full -40°C to 85°C industrial range.

ADG1209YRZ, ADG1209YRZ-REEL7, and ADG1309BRZ-REEL7 (Analog Devices) feature higher on-state resistance (200Ohm and 210Ohm respectively) and reduced supply voltage ranges. These parts are not direct substitutes and require circuit redesign validation. They are suitable only when higher on-state resistance is acceptable or when their enhanced performance characteristics (lower leakage, improved crosstalk) provide system-level benefits.

Frequently Asked Questions (FAQ)

Q: Can DG409DYZ be used as a direct replacement for DG409DY?

A: Yes. DG409DYZ is the active Renesas equivalent with identical electrical specifications, 16-SOIC package, and pin compatibility. The primary differences are product status (active vs. obsolete), RoHS compliance (ROHS3 vs. non-compliant), and MSL rating (2 vs. 1). No circuit modifications are required.

Q: What is the difference between DG409DY+ and DG409CY+?

A: Both are Analog Devices/Maxim parts with 100Ohm on-state resistance and 16-SOIC packaging. DG409DY+ supports -40°C to 85°C operating temperature, while DG409CY+ is limited to 0°C to 70°C. DG409DY+ is preferred for industrial applications; DG409CY+ is suitable for commercial-grade designs. Electrical performance (matching, charge injection) is identical between the two.

Q: Why do ADG409BRZ variants have different supply voltage specifications than DG409DY?

A: ADG409BRZ is specified for 12V single supply and ±15V dual supply operation, whereas DG409DY supports 5V–34V single supply and ±5V–±20V dual supply. These voltage restrictions reflect the device characterization and are not interchangeable without circuit validation. Use ADG409BRZ only in designs already operating within these voltage constraints.

Q: Can ADG1209YRZ or ADG1309BRZ-REEL7 replace DG409DY?

A: No. These parts have higher on-state resistance (200Ohm and 210Ohm vs. 100Ohm) and different supply voltage ranges. While they maintain SP4T/4:1/2-circuit topology and 16-SOIC packaging, the increased on-state resistance will alter circuit performance. These parts require full circuit redesign and validation and are not pin-compatible substitutes.

Q: What packaging options are available for DG409 equivalent parts?

A: All listed substitutes are available in 16-SOIC surface mount package. Packaging variants differ by tape/reel configuration: Tube (standard), Cut Tape & Digi-Reel (CT), and Tape & Reel (TR). Package and case dimensions remain constant at 16-SOIC (0.154", 3.90mm width). Select packaging based on procurement and assembly requirements; electrical performance is identical across packaging variants.

Q: Are all substitute parts RoHS compliant?

A: DG409DY is RoHS non-compliant. All active substitutes listed (DG409DYZ, DG409DY+, ADG409BRZ variants, DG409CY+ variants, ADG1209YRZ variants, ADG1309BRZ-REEL7) are ROHS3 compliant. For applications requiring RoHS compliance, any of these active parts are acceptable replacements.

Q: What is the significance of charge injection and channel capacitance differences?

A: Charge injection and channel capacitance affect signal integrity in high-frequency or precision analog switching applications. DG409DY and ADG409BRZ variants have 20pC charge injection; DG409DY+ and DG409CY+ have 2pC (10× lower). ADG1209 and ADG1309 variants have even lower charge injection (0.4pC and 2pC respectively). For DC switching or low-frequency applications, these differences are negligible. For RF or precision signal routing, lower charge injection variants may provide performance benefits.

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