DG442LDY Equivalent & Substitute Parts

Part Overview

The DG442LDY is a 4-circuit SPST-NO IC switch manufactured by Vishay Siliconix, designed for signal routing and multiplexing applications in the 16-SOIC package. This part operates with single supply voltage (2.7V to 12V) or dual supply (±3V to ±6V), featuring 30Ohm on-state resistance and 280MHz bandwidth. The DG442LDY is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and legacy system support.

Key Parameters

Parameter	DG442LDY Value
Switch Circuit	SPST - NO
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	30Ohm
Channel-to-Channel Matching (ΔRon)	100mOhm
Voltage - Supply, Single (V+)	2.7V ~ 12V
Voltage - Supply, Dual (V±)	±3V ~ 6V
Switch Time (Ton, Toff) (Max)	60ns, 35ns
-3dB Bandwidth	280MHz
Charge Injection	5pC
Channel Capacitance (CS(off), CD(off))	5pF, 6pF
Current - Leakage (IS(off)) (Max)	1nA
Crosstalk	-95dB @ 1MHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DG442LDY is determined by the following critical parameters:

Switch topology: SPST-NO configuration with 4 circuits in 1:1 multiplexer arrangement
Package compatibility: 16-SOIC form factor (0.154", 3.90mm width) for direct PCB replacement
Operating temperature range: -40°C to 85°C minimum requirement
Supply voltage compatibility: Single supply 2.7V to 12V or dual supply ±3V to ±6V
On-state resistance: Acceptable range depends on circuit impedance requirements; lower resistance (30-35Ohm) preferred for low-impedance signal paths
Switching speed: Maximum acceptable Ton/Toff specifications for timing-critical applications
Leakage current: Critical for high-impedance or precision analog applications

Substitute parts are grouped by on-state resistance characteristics, as this parameter directly affects signal attenuation and power dissipation in switching applications. Parts with higher on-state resistance (70Ohm to 160Ohm) are suitable for applications where impedance matching is less critical or where higher supply voltages are available.

Parameter Comparison

Parameter	DG442LDY	ADG442BRZ	ALD4212SCL	DG442DYZ	MAX392CSE+	MAX4512ESE+
Manufacturer	Vishay Siliconix	Analog Devices Inc.	Advanced Linear Devices Inc.	Renesas Electronics	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO
Number of Circuits	4	4	4	4	4	4
On-State Resistance (Max)	30Ohm	70Ohm	135Ohm	85Ohm	35Ohm	160Ohm
Voltage - Supply, Single (V+)	2.7V ~ 12V	12V	3V ~ 12V	5V ~ 34V	3V ~ 15V	9V ~ 36V
Voltage - Supply, Dual (V±)	±3V ~ 6V	±15V	±1.5V ~ 6V	±5V ~ 22V	±3V ~ 8V	±4.5V ~ 18V
Switch Time Ton (Max)	60ns	110ns	130ns	250ns	130ns	500ns
Switch Time Toff (Max)	35ns	60ns	130ns	210ns	75ns	400ns
Charge Injection	5pC	1pC	0.2pC	-1pC	2pC	1.5pC
Channel Capacitance (CS(off), CD(off))	5pF, 6pF	4pF, 4pF	3pF, 3pF	4pF, 4pF	9pF, 9pF	10pF, 5pF
Current - Leakage (IS(off)) (Max)	1nA	500pA	100pA	500pA	100pA	500pA
Crosstalk	-95dB @ 1MHz	-100dB @ 1MHz	-90dB @ 100kHz	-100dB @ 1MHz	-85dB @ 1MHz	-66dB @ 1MHz
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement with minimal design impact:

MAX392CSE+ or MAX392CSE+T are the closest functional equivalents to DG442LDY, offering 35Ohm on-state resistance, comparable switching speed (130ns/75ns), and active product status with ROHS3 compliance. These parts support the required operating temperature range (-40°C to 85°C) and are available in both tube and tape & reel packaging. Supply voltage range (3V to 15V single, ±3V to ±8V dual) covers the DG442LDY requirements.

For applications with higher supply voltage tolerance:

ADG442BRZ or ADG442BRZ-REEL provide 70Ohm on-state resistance with superior crosstalk performance (-100dB @ 1MHz) and lower charge injection (1pC). These parts require higher supply voltages (12V single, ±15V dual) but maintain full operating temperature range and ROHS3 compliance. Suitable for designs where impedance matching is less critical.

For low-leakage or precision analog applications:

ALD4212SCL offers the lowest charge injection (0.2pC) and leakage current (100pA), with 135Ohm on-state resistance. Operating temperature range (-40°C to 85°C) and ROHS3 compliance are maintained. Supply voltage range (3V to 12V single, ±1.5V to ±6V dual) is compatible with DG442LDY specifications.

For high-voltage applications:

DG442DYZ or DG442DYZ-T support extended supply voltage range (5V to 34V single, ±5V to ±22V dual) with 85Ohm on-state resistance and -100dB crosstalk. Full operating temperature range and ROHS3 compliance are provided. MSL rating of 3 (168 hours) requires appropriate moisture control during storage and assembly.

All substitute parts maintain the 16-SOIC package form factor, 4-circuit SPST-NO topology, and 1:1 multiplexer configuration required for direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can MAX4512ESE+ replace DG442LDY directly?

A: MAX4512ESE+ is electrically compatible but not optimal for direct replacement. It features 160Ohm on-state resistance (versus 30Ohm), which increases signal attenuation and power dissipation. Switching time is significantly slower (500ns/400ns versus 60ns/35ns). Use MAX4512ESE+ only when higher impedance and slower switching are acceptable for the application. The 16-SOIC package is compatible.

Q: What is the impact of higher on-state resistance in substitute parts?

A: Higher on-state resistance increases voltage drop across the switch during conduction, reducing signal amplitude in analog applications and increasing power dissipation. For low-impedance signal paths (50Ohm or lower), parts with 30-35Ohm resistance (DG442LDY, MAX392CSE+) are preferred. For higher-impedance circuits (1kOhm or greater), 70-160Ohm resistance has minimal impact on signal integrity.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed (ADG442BRZ, ALD4212SCL, DG442DYZ, MAX392CSE+, MAX4512ESE+) are ROHS3 compliant. The original DG442LDY is RoHS non-compliant. Compliance is required for new designs targeting EU markets or customers with RoHS mandates.

Q: Which substitute part has the fastest switching speed?

A: DG442LDY maintains the fastest switching performance (60ns Ton, 35ns Toff). Among active substitutes, MAX392CSE+ is fastest (130ns Ton, 75ns Toff), followed by ADG442BRZ (110ns Ton, 60ns Toff). For timing-critical applications, MAX392CSE+ is the preferred substitute.

Q: Can I use parts with different supply voltage ranges?

A: Supply voltage range compatibility must be verified against your circuit design. DG442LDY operates at 2.7V to 12V (single) or ±3V to ±6V (dual). Substitutes with higher minimum voltage requirements (e.g., ADG442BRZ at 12V minimum) are not suitable for 2.7V to 5V single-supply designs. Verify your power supply specifications before selection.

Q: What is the significance of charge injection in these parts?

A: Charge injection affects signal accuracy in precision analog applications, particularly in sample-and-hold circuits. Lower charge injection (ALD4212SCL at 0.2pC) is superior for high-precision applications. DG442LDY at 5pC is moderate; higher values (MAX4512ESE+ at 1.5pC) are acceptable for general-purpose switching where precision is not critical.

Q: Are packaging options (tube vs. tape & reel) interchangeable?

A: Tube and tape & reel packaging contain identical parts; the difference is in quantity and handling format. Tube packaging is suitable for low-volume or prototype applications. Tape & reel is standard for high-volume production. Both formats are available for most substitute parts (e.g., ADG442BRZ in tube, ADG442BRZ-REEL in tape & reel).

Q: What is MSL rating and why does DG442DYZ have MSL 3?

A: Moisture Sensitivity Level (MSL) indicates how long a component can be exposed to ambient humidity before assembly. MSL 1 (unlimited) parts like DG442LDY and MAX392CSE+ have no time restrictions. MSL 3 parts like DG442DYZ must be assembled within 168 hours of package opening. For standard manufacturing environments, MSL 1 parts are preferred to reduce process constraints.

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