DG401DJ Equivalent & Substitute Parts

Part Overview

The DG401DJ is a 2-circuit SPST-NO analog switch IC manufactured by Analog Devices Inc./Maxim Integrated, housed in a 16-DIP package with 45Ohm on-state resistance. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. The DG401DJ operates across single supply (10V–30V) or dual supply (±4.5V–±20V) configurations, with switching times of 150ns (Ton) and 100ns (Toff), making it suitable for precision signal routing and multiplexing applications in industrial and instrumentation systems.

Key Parameters

Parameter	Value	Unit
Switch Circuit Type	SPST - NO	—
Number of Circuits	2	—
Multiplexer/Demultiplexer Configuration	1:1	—
On-State Resistance (Max)	45	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	500	pA
Crosstalk	−90	dB @ 1MHz
Operating Temperature	−40–85	°C
Package / Case	16-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the DG401DJ is determined by strict equivalence across the following critical parameters:

Switch topology: SPST-NO configuration with 1:1 multiplexer/demultiplexer circuit
Circuit count: 2 independent circuits
On-state resistance: 45Ohm maximum
Package form factor: 16-DIP through-hole mounting
Operating temperature range: −40°C to 85°C
Supply voltage compatibility: Single supply (10V–30V) or dual supply (±4.5V–±20V)
Switching performance: Ton ≤ 150ns, Toff ≤ 100ns

Two substitute parts meet these criteria: DG401DJ+ (Analog Devices Inc./Maxim Integrated, tube packaging) and DG401DJ-E3 (Vishay Siliconix, tube packaging, active product status). Both maintain identical switch topology, circuit count, on-state resistance, package configuration, and operating temperature range. Differences in secondary parameters (charge injection, crosstalk performance, supply voltage ranges) do not preclude functional substitution within the specified operating envelope.

Parameter Comparison

Parameter	DG401DJ	DG401DJ+	DG401DJ-E3
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Vishay Siliconix
Product Status	Obsolete	Obsolete	Active
Switch Circuit	SPST - NO	SPST - NO	SPST - NO
Number of Circuits	2	2	2
Multiplexer/Demultiplexer Circuit	1:1	1:1	1:1
On-State Resistance (Max)	45 Ohm	45 Ohm	45 Ohm
Channel-to-Channel Matching (ΔRon)	500 mOhm	500 mOhm	Not specified
Voltage - Supply, Single (V+)	10–30 V	10–30 V	13–36 V
Voltage - Supply, Dual (V±)	±4.5–±20 V	±4.5–±20 V	±7–±22 V
Switch Time (Ton, Toff) Max	150, 100 ns	150, 100 ns	150, 100 ns
Charge Injection	10 pC	10 pC	60 pC
Channel Capacitance (CS(off), CD(off))	12, 12 pF	12, 12 pF	12, 12 pF
Current - Leakage (IS(off)) Max	500 pA	500 pA	500 pA
Crosstalk	−90 dB @ 1MHz	−90 dB @ 1MHz	−94.8 dB @ 1MHz
Operating Temperature	−40–85 °C	−40–85 °C	−40–85 °C
Package / Case	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

DG401DJ+ (Analog Devices Inc./Maxim Integrated): This part maintains full electrical and mechanical equivalence to the original DG401DJ while offering ROHS3 compliance. However, it retains obsolete product status. Selection is appropriate for legacy system maintenance where component availability is confirmed and RoHS compliance is not a design requirement.

DG401DJ-E3 (Vishay Siliconix): This part is the preferred substitute, offering active product status and ROHS3 compliance. The DG401DJ-E3 maintains identical switch topology, circuit count, on-state resistance, package configuration, and switching performance. The extended supply voltage range (13–36V single supply, ±7–±22V dual supply) encompasses the original DG401DJ operating envelope. Increased charge injection (60pC vs. 10pC) and improved crosstalk performance (−94.8dB vs. −90dB) represent secondary parameter variations that do not affect functional substitution within the specified operating conditions. The active product status ensures long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can DG401DJ+ and DG401DJ-E3 be used interchangeably with the original DG401DJ?

A: Both parts maintain identical switch topology (SPST-NO, 1:1 configuration), circuit count (2), on-state resistance (45Ohm), package form factor (16-DIP through-hole), and switching performance (150ns/100ns). Functional substitution is supported within the specified operating envelope. The DG401DJ-E3 is preferred due to active product status.

Q: What are the key differences between the substitute parts?

A: DG401DJ+ and DG401DJ-E3 differ in manufacturer (Analog Devices vs. Vishay Siliconix), product status (both obsolete vs. active), and secondary electrical parameters. DG401DJ-E3 exhibits higher charge injection (60pC vs. 10pC) and superior crosstalk performance (−94.8dB vs. −90dB). Supply voltage ranges differ slightly: DG401DJ-E3 supports 13–36V single supply and ±7–±22V dual supply, compared to 10–30V and ±4.5–±20V for the original. These variations do not preclude substitution for standard signal routing and multiplexing applications.

Q: Are there RoHS compliance considerations?

A: The original DG401DJ is RoHS non-compliant. Both substitute parts (DG401DJ+ and DG401DJ-E3) are ROHS3 compliant, making them suitable for applications with RoHS regulatory requirements.

Q: Does the 16-DIP through-hole package remain unchanged across all three parts?

A: Yes. All three parts use identical 16-DIP (0.300", 7.62mm) through-hole packaging, ensuring direct PCB compatibility without layout modifications.

Q: Which substitute part should be selected for new designs?

A: DG401DJ-E3 is the recommended choice for new designs due to active product status, ensuring long-term availability and supply chain stability. ROHS3 compliance supports modern manufacturing and regulatory requirements.

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