MAX318ESA Equivalent & Substitute Parts

Part Overview

The MAX318ESA is a single-circuit SPST-NO (Normally Open) analog switch manufactured by Analog Devices Inc./Maxim Integrated. This 8-SOIC surface mount device provides 35Ohm on-state resistance with dual supply voltage capability (±4.5V to ±20V or 10V to 30V single supply). The MAX318ESA is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across switching performance, voltage ratings, and leakage characteristics while meeting current RoHS compliance standards.

Key Parameters

Parameter	Value	Unit
Switch Circuit Type	SPST - NO	—
Multiplexer/Demultiplexer Circuit	1:1	—
Number of Circuits	1	—
On-State Resistance (Max)	35	Ohm
Channel-to-Channel Matching (ΔRon)	2	Ohm (Max)
Voltage - Supply, Single (V+)	10 ~ 30	V
Voltage - Supply, Dual (V±)	±4.5 ~ ±20	V
Switch Time (Ton, Toff) (Max)	175, 145	ns
Charge Injection	3	pC
Channel Capacitance (CS(off), CD(off))	8, 8	pF
Current - Leakage (IS(off)) (Max)	250	pA
Crosstalk	-85	dB @ 1MHz
Operating Temperature	-40 ~ 85	°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the MAX318ESA is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Requirements:

Switch circuit type: SPST - NO
Circuit configuration: 1:1 multiplexer/demultiplexer
On-state resistance: 35Ohm maximum
Operating temperature range: -40°C to 85°C
Package type: 8-SOIC surface mount

Voltage Supply Compatibility: Substitute parts must support either the dual supply range (±4.5V to ±20V) or single supply range (10V to 30V). Parts with narrower voltage specifications (such as 12V single supply or ±15V dual supply) are acceptable substitutes provided they operate within the application's actual supply voltage requirements.

Switching Performance: Switch timing (Ton/Toff) and charge injection characteristics must be equivalent or superior. Leakage current and crosstalk specifications must meet or exceed the original part's performance.

Compliance and Status: The MAX318ESA is RoHS non-compliant and obsolete. Active substitute parts must be RoHS3 compliant to meet current regulatory requirements.

Parameter Comparison

Parameter	MAX318ESA	MAX318ESA+	DG418DY-E3	DG418DY-T1-E3
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Vishay Siliconix	Vishay Siliconix
Product Status	Obsolete	Active	Active	Active
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO
On-State Resistance (Max)	35 Ohm	35 Ohm	35 Ohm	35 Ohm
Voltage - Supply, Single (V+)	10 ~ 30 V	10 ~ 30 V	12 V	12 V
Voltage - Supply, Dual (V±)	±4.5 ~ ±20 V	±4.5 ~ ±20 V	±15 V	±15 V
Switch Time (Ton, Toff) (Max)	175, 145 ns	175, 145 ns	175, 145 ns	175, 145 ns
Charge Injection	3 pC	3 pC	60 pC	60 pC
Channel Capacitance (CS(off), CD(off))	8, 8 pF	8, 8 pF	8, 8 pF	8, 8 pF
Current - Leakage (IS(off)) (Max)	250 pA	250 pA	250 pA	250 pA
Operating Temperature	-40 ~ 85 °C (TA)	-40 ~ 85 °C (TA)	-40 ~ 85 °C (TA)	-40 ~ 85 °C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	—	Tube	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

MAX318ESA+ (Direct Upgrade): The MAX318ESA+ is the direct active equivalent of the MAX318ESA. It maintains identical electrical specifications including on-state resistance, voltage supply ranges, switching timing, and charge injection. The primary difference is product status (active vs. obsolete) and RoHS3 compliance. This part is the preferred substitute for new designs and production continuity. Packaging is supplied in tubes.

DG418DY-E3 and DG418DY-T1-E3 (Cross-Manufacturer Alternatives): Both Vishay Siliconix parts (DG418DY-E3 and DG418DY-T1-E3) are functionally equivalent SPST-NO switches with identical on-state resistance, switching timing, and leakage current specifications. These parts are active and RoHS3 compliant. The primary electrical difference is charge injection (60pC vs. 3pC for the MAX318ESA), which may affect applications requiring minimal charge injection. Voltage supply specifications are narrower (12V single supply, ±15V dual supply) compared to the MAX318ESA's broader ranges, requiring verification that application supply voltages fall within these limits. DG418DY-E3 is supplied in tubes; DG418DY-T1-E3 is supplied in tape and reel format for high-volume production.

Selection Criteria:

For direct replacement with identical specifications: MAX318ESA+
For cross-manufacturer alternatives with narrower voltage ratings: DG418DY-E3 or DG418DY-T1-E3 (verify supply voltage compatibility)
For high-volume production: DG418DY-T1-E3 (tape and reel packaging)
For RoHS compliance: All active substitutes (MAX318ESA+, DG418DY-E3, DG418DY-T1-E3)

Frequently Asked Questions (FAQ)

Q: Can I use DG418DY-E3 or DG418DY-T1-E3 as a direct replacement for MAX318ESA in all applications?

A: These parts are electrically equivalent for switching function and timing. However, verify that your application's supply voltage operates within the DG418DY series limits (12V single supply or ±15V dual supply). The MAX318ESA supports broader voltage ranges (10V to 30V single supply, ±4.5V to ±20V dual supply). Additionally, the DG418DY series has higher charge injection (60pC vs. 3pC), which may affect precision analog applications.

Q: What is the difference between MAX318ESA+ and MAX318ESA?

A: The MAX318ESA+ is the active production equivalent of the obsolete MAX318ESA. Electrical specifications are identical. The MAX318ESA+ is RoHS3 compliant, while the MAX318ESA is RoHS non-compliant. For new designs and ongoing production, MAX318ESA+ is the recommended substitute.

Q: Are DG418DY-E3 and DG418DY-T1-E3 interchangeable?

A: Yes, these parts are electrically identical. The difference is packaging: DG418DY-E3 is supplied in tubes for lower-volume applications, while DG418DY-T1-E3 is supplied in tape and reel format for automated assembly and high-volume production.

Q: Does the 8-SOIC package remain the same across all substitute parts?

A: Yes. All substitute parts use the 8-SOIC package (0.154", 3.90mm width) with surface mount technology. PCB layout and footprints are compatible across all listed parts.

Q: Are all substitute parts RoHS compliant?

A: The active substitute parts (MAX318ESA+, DG418DY-E3, DG418DY-T1-E3) are ROHS3 compliant. The original MAX318ESA is RoHS non-compliant.

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