DG421DY Equivalent & Substitute Parts

Part Overview

The DG421DY is a 2-circuit IC switch with SPST-NO configuration and 35Ohm on-state resistance, manufactured by Analog Devices Inc./Maxim Integrated. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. The part operates across supply voltage ranges of 10V to 30V (single supply) or ±4.5V to ±20V (dual supply), with switching times of 250ns (Ton) and 200ns (Toff).

Key Parameters

Parameter	Value	Unit
Switch Circuit Type	SPST - NO	—
Multiplexer/Demultiplexer Circuit	1:1	—
Number of Circuits	2	—
On-State Resistance (Max)	35	Ohm
Voltage - Supply, Single (V+)	10 ~ 30	V
Voltage - Supply, Dual (V±)	±4.5 ~ ±20	V
Switch Time (Ton, Toff) (Max)	250, 200	ns
Charge Injection	10	pC
Channel Capacitance (CS(off), CD(off))	12, 12	pF
Current - Leakage (IS(off)) (Max)	500	pA
Crosstalk	-90	dB @ 1MHz
Operating Temperature	-40 ~ 85	°C
Package / Case	16-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the DG421DY is determined by strict equivalence across the following critical parameters:

Switch circuit configuration: SPST - NO topology
Circuit count and multiplexer ratio: 2 circuits, 1:1 configuration
On-state resistance: 35Ohm maximum
Supply voltage ranges: 10V ~ 30V (single) and ±4.5V ~ ±20V (dual)
Package and mounting: 16-SOIC surface mount form factor
Operating temperature range: -40°C ~ 85°C

The MAX301ESE+ meets all these core electrical and mechanical requirements, establishing it as a direct functional equivalent. Both parts share identical switch topology, circuit count, on-state resistance specification, supply voltage compatibility, and package form factor.

Parameter Comparison

Parameter	DG421DY	MAX301ESE+	Unit
Switch Circuit Type	SPST - NO	SPST - NO	—
Multiplexer/Demultiplexer Circuit	1:1	1:1	—
Number of Circuits	2	2	—
On-State Resistance (Max)	35	35	Ohm
Channel-to-Channel Matching (ΔRon) (Max)	3	0.5	Ohm
Voltage - Supply, Single (V+)	10 ~ 30	10 ~ 30	V
Voltage - Supply, Dual (V±)	±4.5 ~ ±20	±4.5 ~ ±20	V
Switch Time (Ton, Toff) (Max)	250, 200	150, 100	ns
Charge Injection	10	10	pC
Channel Capacitance (CS(off), CD(off))	12, 12	12, 12	pF
Current - Leakage (IS(off)) (Max)	500	500	pA
Crosstalk	-90	-90	dB @ 1MHz
Operating Temperature	-40 ~ 85	-40 ~ 85	°C
Package / Case	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	Surface Mount	—
Product Status	Obsolete	Active	—
RoHS Status	RoHS non-compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

The MAX301ESE+ is the manufacturer-recommended substitute for the obsolete DG421DY. Both components are manufactured by Analog Devices Inc./Maxim Integrated and maintain electrical and mechanical compatibility across all critical parameters.

The MAX301ESE+ offers additional advantages in current production environments:

Active product status ensures ongoing availability and manufacturing support
ROHS3 compliance satisfies modern regulatory requirements, whereas the DG421DY is RoHS non-compliant
Improved channel-to-channel matching (0.5Ohm vs. 3Ohm maximum) provides tighter tolerance performance
Faster switching times (150ns Ton, 100ns Toff vs. 250ns, 200ns) enable higher-speed applications

Both parts share identical supply voltage ranges, on-state resistance, charge injection, channel capacitance, leakage current, crosstalk performance, operating temperature range, and 16-SOIC package form factor. Direct PCB layout compatibility is maintained.

Frequently Asked Questions (FAQ)

Q: Can MAX301ESE+ replace DG421DY in existing designs?

A: Yes. The MAX301ESE+ maintains electrical and mechanical equivalence across all critical parameters: SPST-NO switch topology, 2-circuit configuration, 35Ohm on-state resistance, identical supply voltage ranges (10V ~ 30V single, ±4.5V ~ ±20V dual), and 16-SOIC package form factor. No circuit modifications are required.

Q: What are the key differences between DG421DY and MAX301ESE+?

A: The primary differences are product status and compliance. The DG421DY is obsolete and RoHS non-compliant, while MAX301ESE+ is active and ROHS3 compliant. The MAX301ESE+ also provides improved channel-to-channel matching (0.5Ohm vs. 3Ohm) and faster switching times (150ns/100ns vs. 250ns/200ns). All core electrical specifications remain equivalent.

Q: Are there any package or pinout differences?

A: No. Both the DG421DY and MAX301ESE+ use the 16-SOIC (0.154", 3.90mm width) surface mount package with identical pinout and mechanical dimensions. PCB footprints are directly compatible.

Q: Does the improved switching performance of MAX301ESE+ affect circuit design?

A: The faster switching times of MAX301ESE+ (150ns Ton, 100ns Toff) are improvements over the DG421DY specification (250ns, 200ns). These faster transitions are backward-compatible and do not require design changes. Applications requiring the original switching speed specification will operate within acceptable margins.

Q: What is the supply voltage compatibility?

A: Both parts operate identically across single supply (10V ~ 30V) and dual supply (±4.5V ~ ±20V) configurations. No supply circuit modifications are necessary when substituting.

Q: Is the MAX301ESE+ suitable for new designs?

A: Yes. The MAX301ESE+ is an active product with full manufacturing support and ROHS3 compliance, making it the appropriate choice for new designs requiring SPST-NO 2-circuit switch functionality in 16-SOIC packaging.

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