MAX319CSA Equivalent & Substitute Parts

Part Overview

The MAX319CSA is a single-circuit SPDT (Single Pole Double Throw) analog switch manufactured by Analog Devices Inc./Maxim Integrated. This component functions as a 2:1 multiplexer/demultiplexer with 35Ohm on-state resistance in an 8-SOIC surface mount package. The MAX319CSA is classified as obsolete, making identification of functionally equivalent alternatives necessary for new designs and ongoing production support.

Key Parameters

Parameter	MAX319CSA Value
Switch Circuit Type	SPDT
Multiplexer/Demultiplexer Configuration	2:1
Number of Circuits	1
On-State Resistance (Max)	35Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm (Max)
Voltage - Supply, Single (V+)	10V ~ 30V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V
Switch Time (Ton, Toff) (Max)	175ns, 145ns
Charge Injection	3pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF
Current - Leakage (IS(off)) (Max)	250pA
Crosstalk	-85dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MAX319CSA is determined by the following critical parameters:

Primary Substitution Criteria:

Switch circuit type: SPDT
Multiplexer configuration: 2:1
Number of circuits: 1
Package type: 8-SOIC surface mount
On-state resistance: 35Ohm (primary specification)

Secondary Compatibility Factors:

Supply voltage ranges must encompass or exceed the original specification
Leakage current specification: 250pA maximum
Operating temperature range
RoHS compliance status (for new designs)
Product status (Active vs. Obsolete)

Substitute parts are grouped into two categories:

Category 1: Direct Packaging Variants (MAX319CSA+) Parts with identical electrical specifications and packaging, differing only in packaging format or RoHS compliance status.

Category 2: Functional Equivalents (ADG419 and DG419 Series) Parts meeting core switching specifications (SPDT, 2:1, 35Ohm) with compatible supply voltage ranges and package form factor, though with variations in secondary parameters such as charge injection, operating temperature range, and crosstalk performance.

Parameter Comparison

Parameter	MAX319CSA	MAX319CSA+	ADG419BRZ	ADG419BRZ-REEL	ADG419BRZ-REEL7	DG419BDY-E3	DG419BDY-T1-E3	DG419DY-E3	DG419DY-T1-E3
Manufacturer	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices	Analog Devices	Analog Devices	Vishay Siliconix	Vishay Siliconix	Vishay Siliconix	Vishay Siliconix
Switch Circuit	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Multiplexer Configuration	2:1	2:1	2:1	2:1	2:1	2:1	2:1	2:1	2:1
Number of Circuits	1	1	1	1	1	1	1	1	1
On-State Resistance (Max)	35Ohm	35Ohm	35Ohm	35Ohm	35Ohm	25Ohm	25Ohm	35Ohm	35Ohm
Voltage - Supply, Single (V+)	10V ~ 30V	10V ~ 30V	12V	12V	12V	13V ~ 36V	13V ~ 36V	12V	12V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V	±4.5V ~ 20V	±15V	±15V	±15V	±7V ~ 22V	±7V ~ 22V	±15V	±15V
Switch Time Ton (Max)	175ns	175ns	—	—	—	89ns	89ns	175ns	175ns
Switch Time Toff (Max)	145ns	145ns	—	—	—	80ns	80ns	145ns	145ns
Charge Injection	3pC	3pC	—	—	—	38pC	38pC	60pC	60pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF	8pF, 8pF	6pF	6pF	6pF	12pF, 12pF	12pF, 12pF	8pF, 8pF	8pF, 8pF
Current - Leakage (IS(off)) (Max)	250pA	250pA	250pA	250pA	250pA	250pA	250pA	250pA	250pA
Crosstalk	-85dB @ 1MHz	-85dB @ 1MHz	-90dB @ 1MHz	-90dB @ 1MHz	-90dB @ 1MHz	-88dB @ 1MHz	-88dB @ 1MHz	—	—
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

MAX319CSA+ is the primary direct substitute. It maintains all electrical specifications of the original MAX319CSA while offering Active product status and ROHS3 compliance. This part is suitable for designs requiring no circuit modifications and is available in Tube packaging.

For Active Product Status with Extended Temperature Range:

ADG419BRZ, ADG419BRZ-REEL, and ADG419BRZ-REEL7 are Analog Devices alternatives with identical on-state resistance (35Ohm) and matching switch timing specifications. These parts support extended operating temperature range (-40°C to 125°C) and offer improved crosstalk performance (-90dB @ 1MHz). Supply voltage specifications differ: single supply is fixed at 12V and dual supply at ±15V, requiring circuit verification against the original 10V ~ 30V and ±4.5V ~ 20V ranges.

For Lower On-State Resistance Requirement:

DG419BDY-E3 and DG419BDY-T1-E3 (Vishay Siliconix) provide 25Ohm on-state resistance with faster switch times (89ns Ton, 80ns Toff). These parts are suitable only if circuit design permits lower resistance values. Supply voltage range is 13V ~ 36V (single) and ±7V ~ 22V (dual).

For Matched Electrical Characteristics:

DG419DY-E3 and DG419DY-T1-E3 (Vishay Siliconix) match the original 35Ohm on-state resistance and 175ns/145ns switch timing. Operating temperature range extends to -40°C ~ 85°C. These parts are available in Tube (DG419DY-E3) and Cut Tape & Digi-Reel (DG419DY-T1-E3) packaging formats.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant, addressing regulatory requirements for new designs. The original MAX319CSA is RoHS non-compliant and should be replaced in applications subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can MAX319CSA+ be used as a direct drop-in replacement for MAX319CSA?

A: Yes. MAX319CSA+ is electrically and mechanically identical to MAX319CSA. The primary differences are product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Packaging format differs (Tube vs. unspecified), but the 8-SOIC package footprint is identical.

Q: What are the key differences between Analog Devices ADG419 variants and Vishay DG419 variants?

A: Both families maintain the 35Ohm on-state resistance and SPDT 2:1 configuration. ADG419BRZ series supports extended temperature range (-40°C to 125°C) with fixed supply voltages (12V single, ±15V dual). DG419DY series operates to -40°C ~ 85°C with the same fixed supply voltages. DG419BDY series offers lower on-state resistance (25Ohm) with wider supply voltage ranges (13V ~ 36V single, ±7V ~ 22V dual) and faster switching times.

Q: Why do some substitute parts show missing values (—) for charge injection and switch time?

A: Missing parameter values indicate that the manufacturer did not specify these characteristics in the datasheet. This does not indicate non-compliance; rather, these parameters may not be critical for the intended application or may be guaranteed through different test conditions. Consult the manufacturer datasheet for complete specifications.

Q: Are packaging format differences (Tube, Cut Tape & Digi-Reel, Tape & Reel) electrically significant?

A: No. Packaging format affects only handling, storage, and automated assembly compatibility. Electrical performance and package footprint (8-SOIC) remain identical across all packaging variants. Selection should be based on production assembly requirements and inventory management practices.

Q: Can DG419BDY-E3 (25Ohm) be substituted for MAX319CSA (35Ohm)?

A: Substitution is possible only if circuit design permits lower on-state resistance. Lower resistance reduces signal attenuation and improves bandwidth but may alter circuit behavior in applications sensitive to impedance matching. Circuit simulation or testing is necessary to confirm compatibility.

Q: What supply voltage range should be verified when selecting a substitute?

A: The original MAX319CSA supports 10V ~ 30V (single supply) and ±4.5V ~ 20V (dual supply). Most substitutes operate at fixed voltages (12V single, ±15V dual) or narrower ranges. Verify that the substitute part's supply voltage specification encompasses the actual operating voltages in your circuit. DG419BDY series offers the widest single supply range (13V ~ 36V).

Q: Is the extended operating temperature range of ADG419BRZ (-40°C to 125°C) beneficial for MAX319CSA replacement?

A: Extended temperature range provides design margin for applications operating outside the original 0°C ~ 70°C specification. This is beneficial for industrial, automotive, or aerospace applications. For consumer applications operating within 0°C ~ 70°C, the extended range offers no functional advantage but ensures compatibility with future temperature requirements.

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