DG403AK Equivalent & Substitute Parts Reference

Part Overview

The DG403AK is a dual-channel SPDT (Single Pole Double Throw) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated. This 16-CDIP through-hole package device provides 2:1 multiplexing functionality with 30Ohm on-state resistance, designed for signal routing and switching applications across industrial and commercial temperature ranges.

The DG403AK is classified as obsolete. Identifying functionally equivalent active-production alternatives is necessary to ensure design continuity, supply chain reliability, and long-term component availability for new designs and production runs.

Key Parameters

Parameter	Value	Unit
Switch Circuit Configuration	SPDT	—
Multiplexer/Demultiplexer Circuit	2:1	—
Number of Circuits	2	—
On-State Resistance (Max)	30	Ohm
Channel-to-Channel Matching (ΔRon)	500	mOhm
Voltage - Supply, Single (V+)	10 ~ 30	V
Voltage - Supply, Dual (V±)	±4.5 ~ 20	V
Switch Time (Ton, Toff) (Max)	150, 100	ns
Charge Injection	10	pC
Channel Capacitance (CS(off), CD(off))	12, 12	pF
Current - Leakage (IS(off)) (Max)	250	pA
Crosstalk	-90	dB @ 1MHz
Operating Temperature Range	-55 ~ 125	°C
Mounting Type	Through Hole	—
Package / Case	16-CDIP (0.300", 7.62mm)	—

Substitute Part Grouping Explanation

Substitution eligibility for the DG403AK is determined by strict parametric matching across the following critical criteria:

Functional Architecture: Switch circuit type (SPDT), multiplexer configuration (2:1), and number of circuits (2) must be identical.

Electrical Performance: On-state resistance (30Ohm maximum), channel-to-channel matching (500mOhm), supply voltage ranges (single 10V–30V and dual ±4.5V–20V), switch timing (150ns/100ns), charge injection (10pC), channel capacitance (12pF each), leakage current (250pA), and crosstalk performance (-90dB @ 1MHz) must match exactly.

Environmental Specifications: Operating temperature range (-55°C to 125°C) must be maintained.

Physical Compatibility: Mounting type (through hole) and package designation (16-CDIP, 0.300" / 7.62mm) must be identical to ensure direct board-level substitution without layout modification.

Substitute parts meeting all these parameters are classified as parametric equivalents and are directly interchangeable at the component level.

Parameter Comparison

Parameter	DG403AK (Main Part)	MAX303MJE (Substitute)	Match Status
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Identical
Switch Circuit	SPDT	SPDT	Identical
Multiplexer/Demultiplexer Circuit	2:1	2:1	Identical
Number of Circuits	2	2	Identical
On-State Resistance (Max)	30 Ohm	30 Ohm	Identical
Channel-to-Channel Matching (ΔRon)	500 mOhm	500 mOhm	Identical
Voltage - Supply, Single (V+)	10 ~ 30 V	10 ~ 30 V	Identical
Voltage - Supply, Dual (V±)	±4.5 ~ 20 V	±4.5 ~ 20 V	Identical
Switch Time (Ton, Toff) (Max)	150 ns, 100 ns	150 ns, 100 ns	Identical
Charge Injection	10 pC	10 pC	Identical
Channel Capacitance (CS(off), CD(off))	12 pF, 12 pF	12 pF, 12 pF	Identical
Current - Leakage (IS(off)) (Max)	250 pA	250 pA	Identical
Crosstalk	-90 dB @ 1MHz	-90 dB @ 1MHz	Identical
Operating Temperature	-55°C ~ 125°C (TA)	-55°C ~ 125°C (TA)	Identical
Mounting Type	Through Hole	Through Hole	Identical
Package / Case	16-CDIP (0.300", 7.62mm)	16-CDIP (0.300", 7.62mm)	Identical
Product Status	Obsolete	Active	Substitute is active production
ECCN	EAR99	EAR99	Identical
HTSUS	8542.39.0001	8542.39.0001	Identical

Engineering Selection Recommendations

MAX303MJE is the direct parametric equivalent for DG403AK replacement.

Substitution Basis:

All electrical, functional, and physical parameters match exactly between the DG403AK and MAX303MJE. Both devices are manufactured by Analog Devices Inc./Maxim Integrated and share identical specifications across switch architecture, on-state resistance, supply voltage ranges, switching performance, and package configuration.

Product Status Advantage:

The MAX303MJE is classified as active production, whereas the DG403AK is obsolete. Selection of MAX303MJE ensures:

Continued component availability from authorized distributors
Compliance with current manufacturing and quality standards
Long-term supply chain stability for production and design updates
Identical export classification (EAR99) and tariff coding (HTSUS 8542.39.0001)

Direct Interchangeability:

The 16-CDIP through-hole package, pinout compatibility, and identical electrical specifications enable direct board-level substitution without schematic revision, layout modification, or firmware changes.

Frequently Asked Questions (FAQ)

Q: Can MAX303MJE be used as a direct replacement for DG403AK without PCB layout changes?

A: Yes. Both devices use the 16-CDIP through-hole package with identical pin assignments and electrical specifications. No layout modification is required.

Q: Are there any electrical performance differences between DG403AK and MAX303MJE?

A: No. All specified electrical parameters are identical, including on-state resistance (30Ohm), supply voltage ranges (10–30V single, ±4.5–20V dual), switch timing (150ns/100ns), charge injection (10pC), leakage current (250pA), and crosstalk performance (-90dB @ 1MHz).

Q: Why is DG403AK classified as obsolete?

A: The DG403AK has been discontinued by the manufacturer. MAX303MJE is the active-production equivalent that maintains full functional and electrical compatibility.

Q: What is the operating temperature range for both devices?

A: Both DG403AK and MAX303MJE operate across -55°C to 125°C (TA).

Q: Are export classifications identical for both parts?

A: Yes. Both parts share ECCN classification EAR99 and HTSUS tariff code 8542.39.0001.

Q: Can these devices be used in dual-supply (±V) applications?

A: Yes. Both DG403AK and MAX303MJE support dual-supply operation with voltage range ±4.5V to ±20V, in addition to single-supply operation (10V–30V).

Q: What is the maximum on-state resistance specification?

A: The maximum on-state resistance for both devices is 30Ohm, with channel-to-channel matching of 500mOhm.

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