DG441LDY-T1 Equivalent & Substitute Parts

Part Overview

The DG441LDY-T1 is a 4-circuit SPST-NC analog switch IC manufactured by Vishay Siliconix in 16-SOIC surface mount packaging. This device operates as a 1:1 multiplexer/demultiplexer with 30Ohm on-state resistance and supports single supply voltages from 2.7V to 12V or dual supplies from ±3V to ±6V. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	DG441LDY-T1
Manufacturer	Vishay Siliconix
Switch Circuit Type	SPST - NC
Number of Circuits	4
Multiplexer Configuration	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)
Product Status	Obsolete
RoHS Status	RoHS non-compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the DG441LDY-T1 is determined by the following critical parameters:

Switch Circuit Type: SPST - NC (Single Pole Single Throw - Normally Closed)
Number of Circuits: 4 independent switch circuits
Multiplexer Configuration: 1:1 ratio
Package Type: 16-SOIC surface mount form factor
Operating Temperature Range: -40°C to 85°C minimum
Supply Voltage Compatibility: Single or dual supply operation

Substitute parts are grouped into three categories based on on-state resistance characteristics:

Low Resistance Group (25-30Ohm): MAX4711CSE+ offers comparable low-resistance performance with similar supply voltage ranges and faster switching characteristics.

Medium Resistance Group (70-85Ohm): ADG441BRZ, ADG441BRZ-REEL, DG441DYZ, and DG441DYZ-T provide active product status with higher voltage ratings and improved RoHS compliance.

Higher Resistance Group (135-160Ohm): ALD4211SCL and MAX4511 series offer alternative electrical characteristics with trade-offs in resistance and switching speed but maintain the same package and circuit configuration.

Parameter Comparison

Parameter	DG441LDY-T1	MAX4711CSE+	ADG441BRZ	DG441DYZ	ALD4211SCL	MAX4511CSE+
Manufacturer	Vishay Siliconix	Analog Devices Inc./Maxim	Analog Devices Inc.	Renesas Electronics	Advanced Linear Devices	Analog Devices Inc./Maxim
Product Status	Obsolete	Active	Active	Active	Active	Active
Switch Circuit	SPST - NC	SPST - NC	SPST - NC	SPST - NC	SPST - NC	SPST - NC
Number of Circuits	4	4	4	4	4	4
Multiplexer Configuration	1:1	1:1	1:1	1:1	1:1	1:1
On-State Resistance (Max)	30Ohm	25Ohm	70Ohm	85Ohm	135Ohm	160Ohm
Channel-to-Channel Matching (ΔRon)	100mOhm	200mOhm	-	-	2.7Ohm	-
Voltage - Supply, Single (V+)	2.7V ~ 12V	2.7V ~ 11V	12V	5V ~ 34V	3V ~ 12V	9V ~ 36V
Voltage - Supply, Dual (V±)	±3V ~ 6V	±2.7V ~ 5.5V	±15V	±5V ~ 22V	±1.5V ~ 6V	±4.5V ~ 18V
Switch Time Ton (Max)	60ns	125ns	110ns	250ns	130ns	500ns
Switch Time Toff (Max)	35ns	80ns	60ns	120ns	130ns	400ns
-3dB Bandwidth	280MHz	-	-	-	-	-
Charge Injection	5pC	25pC	1pC	-1pC	0.2pC	1.5pC
Channel Capacitance (CS(off), CD(off))	5pF, 6pF	8pF, 8pF	4pF, 4pF	4pF, 4pF	3pF, 3pF	10pF, 5pF
Current - Leakage (IS(off)) (Max)	1nA	500pA	500pA	500pA	100pA	500pA
Crosstalk	-95dB @ 1MHz	-87dB @ 1MHz	-100dB @ 1MHz	-100dB @ 1MHz	-90dB @ 100kHz	-66dB @ 1MHz
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C (CSE+) / -40°C ~ 85°C (ESE+)
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement with Active Product Status and Full Temperature Range (-40°C to 85°C):

DG441DYZ and DG441DYZ-T (Renesas Electronics) are the primary recommendations. Both maintain the same base product number (DG441) with 85Ohm on-state resistance, support extended supply voltage ranges (5V to 34V single supply, ±5V to ±22V dual supply), and carry ROHS3 compliance. These parts are available in both tube and cut tape packaging with substantial inventory levels.

For Low-Resistance Applications Requiring Active Status:

MAX4711CSE+ (Analog Devices Inc./Maxim Integrated) provides 25Ohm on-state resistance with 200mOhm channel matching, closely matching the DG441LDY-T1 electrical performance. However, the operating temperature range is limited to 0°C to 70°C, and supply voltage ranges are slightly reduced (2.7V to 11V single supply, ±2.7V to 5.5V dual supply).

For Higher Voltage Applications:

MAX4511 series (CSE+, CSE+T, ESE+, ESE+T variants) supports the widest supply voltage range (9V to 36V single supply, ±4.5V to ±18V dual supply) with 160Ohm on-state resistance. The ESE+ variants extend the operating temperature to -40°C to 85°C. Trade-offs include slower switching times (500ns Ton, 400ns Toff) and higher crosstalk (-66dB @ 1MHz).

For Low-Leakage and Low-Charge-Injection Requirements:

ALD4211SCL (Advanced Linear Devices Inc.) offers the lowest charge injection (0.2pC) and leakage current (100pA), with 135Ohm on-state resistance. Supply voltage ranges are 3V to 12V single supply and ±1.5V to ±6V dual supply, with full -40°C to 85°C temperature coverage and ROHS3 compliance.

For Compliance-Critical Applications:

All substitute parts listed carry ROHS3 compliance, addressing the RoHS non-compliant status of the obsolete DG441LDY-T1. Moisture sensitivity levels are uniform at MSL 1 (unlimited) for most alternatives, with DG441DYZ variants at MSL 2 (1 year).

Frequently Asked Questions (FAQ)

Q: Can I directly replace DG441LDY-T1 with DG441DYZ without circuit modifications?

A: Functional compatibility is maintained as both are 4-circuit SPST-NC switches in 16-SOIC packaging with identical circuit configuration. However, the on-state resistance increases from 30Ohm to 85Ohm, which affects signal attenuation and power dissipation. Circuit analysis is required to confirm acceptable performance in your specific application. Supply voltage ranges are also expanded in DG441DYZ, which may require design review.

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

A: Higher on-state resistance increases voltage drop across the switch and power dissipation during conduction. For low-impedance signal paths or high-current applications, this may introduce unacceptable signal loss or thermal effects. Applications with high-impedance loads or low-current switching are less sensitive to resistance changes. Crosstalk performance may also be affected by resistance variations.

Q: Are all substitute parts available in the same packaging options?

A: All substitute parts are available in 16-SOIC surface mount packaging. Packaging variants differ by supplier: tube, cut tape with digi-reel, and tape & reel options are available across the product line. Verify specific packaging availability with your supplier for production requirements.

Q: Which substitute part best matches the original DG441LDY-T1 electrical performance?

A: MAX4711CSE+ provides the closest electrical match with 25Ohm on-state resistance and comparable switching times (125ns Ton, 80ns Toff). However, its operating temperature range is limited to 0°C to 70°C. For full -40°C to 85°C coverage with similar low-resistance performance, no exact match exists; DG441DYZ at 85Ohm represents the best compromise with active product status and extended temperature range.

Q: What are the compliance differences between the original part and substitutes?

A: The DG441LDY-T1 is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, meeting current environmental regulations. Moisture sensitivity levels are MSL 1 (unlimited) for most substitutes, with DG441DYZ variants at MSL 2 (1 year), requiring controlled storage conditions.

Q: Can I use MAX4511 series for applications requiring the full -40°C to 85°C temperature range?

A: MAX4511CSE+ and MAX4511CSE+T are limited to 0°C to 70°C. MAX4511ESE+ and MAX4511ESE+T extend to -40°C to 85°C and are suitable for full-range applications. Verify the specific variant part number to confirm temperature coverage.

Q: How do switching times affect circuit performance when substituting parts?

A: Faster switching times (DG441LDY-T1 at 60ns Ton, 35ns Toff) enable higher-frequency signal switching and reduced settling time. Slower substitutes like MAX4511 series (500ns Ton, 400ns Toff) may limit maximum switching frequency and increase propagation delay. Applications with strict timing requirements must account for these differences in system-level timing analysis.

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