DG421DY+ Equivalent & Substitute Parts

Part Overview

The DG421DY+ is a 2-circuit IC switch with SPST-NO (Single Pole Single Throw - Normally Open) configuration manufactured by Analog Devices Inc./Maxim Integrated. This component features 35Ohm on-state resistance and operates across a wide supply voltage range of 10V to 30V (single supply) or ±4.5V to 20V (dual supply). The DG421DY+ is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The part is housed in a 16-SOIC surface mount package and maintains ROHS3 compliance with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SPST - NO
Number of Circuits	2
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	35Ohm
Voltage - Supply, Single (V+)	10V ~ 30V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V
Operating Temperature Range	-40°C ~ 85°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Switch topology: SPST-NO configuration with 2 circuits in 1:1 multiplexer arrangement
On-state resistance: Maximum 35Ohm specification
Supply voltage compatibility: 10V to 30V single supply or ±4.5V to 20V dual supply operation
Package form factor: 16-SOIC surface mount housing with identical 0.154" (3.90mm) width
Operating temperature range: -40°C to 85°C ambient capability
Regulatory compliance: ROHS3 compliance and REACH unaffected status

The MAX301ESE+ meets all substitution criteria as a functionally equivalent part. Both components share identical switch circuit topology, circuit count, on-state resistance specification, supply voltage ranges, operating temperature range, package configuration, and regulatory compliance status. The MAX301ESE+ is currently in active production status, providing long-term availability for replacement and new applications.

Parameter Comparison

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

Engineering Selection Recommendations

The MAX301ESE+ is the direct functional equivalent for DG421DY+ replacement applications. Both parts maintain identical electrical specifications for switch circuit topology, on-state resistance, supply voltage ranges, operating temperature capability, and package configuration. The MAX301ESE+ offers improved performance characteristics in channel-to-channel matching (500mOhm versus 3Ohm) and faster switch timing (150ns/100ns versus 250ns/200ns), representing enhanced specifications relative to the obsolete DG421DY+.

The MAX301ESE+ is currently in active production status, ensuring long-term component availability and supply chain continuity. Both parts maintain equivalent regulatory compliance with ROHS3 certification and REACH unaffected status. The identical 16-SOIC package footprint enables direct PCB layout compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can MAX301ESE+ directly replace DG421DY+ in existing designs?

A: Yes. Both parts share identical switch circuit topology (SPST-NO), circuit count (2), on-state resistance (35Ohm maximum), supply voltage ranges (10V-30V single or ±4.5V-20V dual), operating temperature range (-40°C to 85°C), and 16-SOIC package configuration. No PCB layout or schematic modifications are required.

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

A: The MAX301ESE+ provides improved channel-to-channel matching (500mOhm versus 3Ohm maximum) and faster switching times (150ns/100ns versus 250ns/200ns). The MAX301ESE+ is in active production while DG421DY+ is obsolete. All other electrical and mechanical specifications remain equivalent.

Q: Are there packaging differences between these parts?

A: Both parts use identical 16-SOIC surface mount packaging with 0.154" (3.90mm) width. The MAX301ESE+ is supplied in tube packaging while DG421DY+ packaging details were not specified. The physical footprint and pin configuration are identical.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both DG421DY+ and MAX301ESE+ are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity rating. Regulatory compliance is equivalent across both components.

Q: Which part should be selected for new designs?

A: MAX301ESE+ should be selected for new designs due to active production status, ensuring long-term availability and supply chain support. The improved performance specifications (faster switching, better channel matching) provide additional design margin.

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