DG509ADY Equivalent & Substitute Parts

Part Overview

The DG509ADY is a 2-circuit SP4T analog switch IC manufactured by Analog Devices Inc./Maxim Integrated, configured as a 4:1 multiplexer/demultiplexer with 450Ohm on-state resistance in a 16-SOIC surface mount package. The device operates across a dual supply voltage range of ±4.5V to ±18V and is rated for -40°C to 85°C operating temperature.

The DG509ADY is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and leverage improved performance characteristics offered by active product alternatives from Analog Devices, Vishay Siliconix, and Texas Instruments.

Key Parameters

Parameter	DG509ADY
Switch Circuit Configuration	SP4T
Multiplexer/Demultiplexer Circuit	4:1
Number of Circuits	2
On-State Resistance (Max)	450Ohm
Channel-to-Channel Matching (ΔRon)	27Ohm
Voltage - Supply, Dual (V±)	±4.5V ~ 18V
Switch Time (Ton, Toff) (Max)	1.5µs, 1µs
Channel Capacitance (CS(off), CD(off))	5pF, 12pF
Current - Leakage (IS(off)) (Max)	1nA
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

Substitute parts for the DG509ADY are grouped based on the following substitution criteria:

Direct Functional Equivalents (Same Base Specifications):

SP4T switch circuit configuration
4:1 multiplexer/demultiplexer topology
2 circuits per package
16-SOIC surface mount package
Operating temperature range -40°C to 85°C (or extended)
Dual supply voltage operation

Allowed Parameter Variations:

On-state resistance: 270Ohm to 1.5kOhm (lower resistance provides improved performance; higher resistance acceptable for lower-speed applications)
Channel-to-channel matching (ΔRon): 8.1Ohm to 27Ohm (tighter matching improves signal integrity)
Switch time: 230ns to 1.5µs (faster switching acceptable for legacy designs)
Supply voltage range: Must support ±4.5V minimum to ±18V maximum or broader range
Leakage current: 1nA to 500pA (lower leakage acceptable)
RoHS compliance: Active products preferred; RoHS3 compliance available

Package Compatibility:

16-SOIC form factor required
Packaging variants (Tube, Tape & Reel, Cut Tape & Digi-Reel) are interchangeable for functional equivalence

Parameter Comparison

Part Number	Manufacturer	Switch Circuit	On-State Resistance (Max)	ΔRon (Max)	Voltage - Supply, Dual (V±)	Switch Time Ton/Toff (Max)	Operating Temp	Product Status	RoHS Status	Packaging
DG509ADY	Analog Devices/Maxim	SP4T	450Ohm	27Ohm	±4.5V ~ 18V	1.5µs, 1µs	-40°C ~ 85°C	Obsolete	Non-compliant	16-SOIC
DG509ADY+	Analog Devices/Maxim	SP4T	450Ohm	27Ohm	±4.5V ~ 18V	1.5µs, 1µs	-40°C ~ 85°C	Active	ROHS3 Compliant	16-SOIC (Tube)
ADG509AKRZ-REEL	Analog Devices	SP4T	450Ohm	22.5Ohm	±10.8V ~ 16.5V	300ns, 300ns	-40°C ~ 85°C	Active	ROHS3 Compliant	16-SOIC (TR)
ADG509AKRZ-REEL7	Analog Devices	SP4T	450Ohm	22.5Ohm	±10.8V ~ 16.5V	300ns, 300ns	-40°C ~ 85°C	Active	ROHS3 Compliant	16-SOIC (CT & Digi-Reel)
ADG509FBRNZ	Analog Devices	SP4T	270Ohm (Typ)	8.1Ohm	±15V	230ns, 130ns	-40°C ~ 85°C	Active	ROHS3 Compliant	16-SOIC (Tube)
ADG509FBRNZ-REEL7	Analog Devices	SP4T	270Ohm (Typ)	8.1Ohm	±15V	230ns, 130ns	-40°C ~ 85°C	Active	ROHS3 Compliant	16-SOIC (CT & Digi-Reel)
ADG509FBRWZ	Analog Devices	SP4T	270Ohm (Typ)	8.1Ohm	±15V	230ns, 130ns	-40°C ~ 85°C	Active	ROHS3 Compliant	16-SOIC (Tube, 7.50mm)
DG509BEY-T1-E3	Vishay Siliconix	SP4T	380Ohm	10Ohm	±5V ~ 20V	250ns, 240ns	-40°C ~ 125°C	Active	ROHS3 Compliant	16-SOIC (CT & Digi-Reel)
MPC509AU	Texas Instruments	SP4T	1.5kOhm	—	±5V ~ 22V	200ns, 250ns (Typ)	-40°C ~ 85°C	Active	ROHS3 Compliant	16-SOIC (Tube, 7.50mm)
MPC509AU/1K	Texas Instruments	SP4T	1.5kOhm	—	±5V ~ 22V	200ns, 250ns (Typ)	-40°C ~ 85°C	Active	ROHS3 Compliant	16-SOIC (TR, 7.50mm)

Engineering Selection Recommendations

Primary Recommendation: DG509ADY+

The DG509ADY+ is the direct active equivalent of the obsolete DG509ADY. It maintains identical electrical specifications (450Ohm on-state resistance, 27Ohm channel matching, ±4.5V to ±18V dual supply range) while offering ROHS3 compliance and active product status. This part requires no design modification and provides the shortest qualification path for legacy system updates.

Secondary Recommendation: ADG509AKRZ-REEL or ADG509AKRZ-REEL7

These Analog Devices parts offer improved performance characteristics: tighter channel-to-channel matching (22.5Ohm vs. 27Ohm), faster switching times (300ns vs. 1.5µs), and ROHS3 compliance. The supply voltage range (±10.8V to ±16.5V) is narrower than the DG509ADY but covers standard industrial dual-supply applications. These parts are suitable for designs where improved switching speed and matching are beneficial.

Alternative Recommendation: ADG509FBRNZ or ADG509FBRNZ-REEL7

These parts feature lower on-state resistance (270Ohm typical), superior channel matching (8.1Ohm), and faster switching performance (230ns/130ns). They require fixed ±15V dual supply operation and are optimized for applications demanding lower insertion loss and improved signal fidelity. ROHS3 compliance and active status are confirmed.

Cross-Manufacturer Alternative: DG509BEY-T1-E3 (Vishay Siliconix)

This part provides 380Ohm on-state resistance, extended operating temperature range (-40°C to 125°C), and broader supply voltage compatibility (±5V to ±20V). It is suitable for applications requiring wider temperature operation or flexible supply voltage requirements. ROHS3 compliance and active status are confirmed.

Higher-Impedance Alternative: MPC509AU or MPC509AU/1K (Texas Instruments)

These parts feature 1.5kOhm on-state resistance and are suitable for applications where higher channel impedance is acceptable or preferred. They offer the broadest supply voltage range (±5V to ±22V) and active product status with ROHS3 compliance. These parts are appropriate for low-speed switching or high-impedance signal routing applications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace DG509ADY with DG509ADY+ without design changes?

A: Yes. The DG509ADY+ is electrically and mechanically identical to the DG509ADY. It maintains the same on-state resistance (450Ohm), channel matching (27Ohm), supply voltage range (±4.5V to ±18V), and package (16-SOIC). The primary difference is active product status and ROHS3 compliance.

Q: What is the key difference between ADG509AKRZ-REEL and ADG509FBRNZ?

A: Both are Analog Devices SP4T switches in 16-SOIC packages with active status and ROHS3 compliance. The ADG509AKRZ-REEL maintains 450Ohm on-state resistance with ±10.8V to ±16.5V supply range and 300ns switching time. The ADG509FBRNZ offers lower on-state resistance (270Ohm typical), tighter matching (8.1Ohm), faster switching (230ns/130ns), but requires fixed ±15V supply operation. Select based on your supply voltage availability and switching speed requirements.

Q: Is the DG509BEY-T1-E3 from Vishay Siliconix compatible with the DG509ADY?

A: Yes, functionally compatible. The DG509BEY-T1-E3 is an SP4T 4:1 switch in 16-SOIC package with 380Ohm on-state resistance. It differs in on-state resistance (380Ohm vs. 450Ohm), channel matching (10Ohm vs. 27Ohm), and supply voltage range (±5V to ±20V vs. ±4.5V to ±18V). It also supports extended operating temperature (-40°C to 125°C). Verify your supply voltage and temperature requirements before selection.

Q: Why would I choose MPC509AU over the Analog Devices alternatives?

A: The MPC509AU from Texas Instruments offers the broadest supply voltage range (±5V to ±22V) and is suitable for applications requiring flexible power supply options. Its 1.5kOhm on-state resistance is higher than the DG509ADY, making it appropriate for low-speed switching or applications where higher channel impedance is acceptable. It maintains active product status and ROHS3 compliance.

Q: What packaging options are available for these substitute parts?

A: Substitute parts are available in three packaging formats: Tube (individual packaging), Tape & Reel (TR) for automated assembly, and Cut Tape & Digi-Reel (CT) for mixed-volume applications. All maintain the 16-SOIC form factor. Select packaging based on your procurement volume and assembly process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitute parts except the original DG509ADY are ROHS3 compliant. The DG509ADY is RoHS non-compliant. If RoHS compliance is a design requirement, select from DG509ADY+, ADG509 series, DG509BEY-T1-E3, or MPC509 series alternatives.

Q: Can I use these parts interchangeably in existing designs?

A: Functional interchangeability depends on your specific application requirements. All parts maintain SP4T 4:1 switch topology and 16-SOIC packaging. Verify compatibility based on: (1) supply voltage range requirements, (2) on-state resistance tolerance, (3) switching speed requirements, and (4) operating temperature range. Consult device datasheets for detailed electrical specifications before design implementation.

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