DG303AC/D Equivalent & Substitute Parts

Part Overview

The DG303AC/D is a 2-circuit IC switch with SPDT (Single Pole Double Throw) configuration and 50Ohm on-state resistance, manufactured by Analog Devices Inc./Maxim Integrated. This die-form component operates across a supply voltage range of 5V to 18V (single supply) or ±5V to ±18V (dual supply), with switching times of 300ns (Ton) and 250ns (Toff). The DG303AC/D is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The primary constraint for substitution is the die packaging format, which limits direct mechanical compatibility to similar die-form implementations or requires integration into alternative package types.

Key Parameters

Parameter	Value	Substitution Relevance
Switch Circuit Type	SPDT	Critical - must match for functional equivalence
Multiplexer/Demultiplexer Circuit	2:1	Critical - defines switching configuration
Number of Circuits	2	Critical - determines channel count
On-State Resistance (Max)	50Ohm	Critical - affects signal integrity and impedance matching
Voltage - Supply, Dual (V±)	±5V ~ 18V	Critical - defines operating voltage range
Switch Time (Ton, Toff) (Max)	300ns, 250ns	Critical - determines switching performance
Charge Injection	12pC	Important - affects signal fidelity
Channel Capacitance (CS(off), CD(off))	14pF, 14pF	Important - impacts bandwidth and crosstalk
Current - Leakage (IS(off)) (Max)	5nA	Important - determines off-state isolation
Crosstalk	-74dB @ 500kHz	Important - channel isolation specification
Operating Temperature	0°C ~ 70°C (TA)	Important - defines thermal operating range
Mounting Type	Surface Mount	Important - assembly compatibility
Package / Case	Die	Critical - physical form factor constraint

Substitute Part Grouping Explanation

Substitution of the DG303AC/D is determined by strict electrical and mechanical parameter matching. The following parameters establish substitution validity:

Electrical Parameters (Must Match):

Switch circuit type: SPDT
Multiplexer/Demultiplexer circuit: 2:1
Number of circuits: 2
On-state resistance: 50Ohm maximum
Dual supply voltage range: ±5V ~ 18V
Switch timing: 300ns (Ton), 250ns (Toff) maximum
Charge injection: 12pC
Channel capacitance: 14pF (CS(off) and CD(off))
Leakage current: 5nA maximum
Crosstalk: -74dB @ 500kHz
Operating temperature: 0°C ~ 70°C

Mechanical Parameters (Must Match or Provide Functional Equivalence):

Mounting type: Surface Mount
Package form: Die or packaged equivalent (16-SOIC acceptable for board-level integration)

The DG303ACWE+ qualifies as a manufacturer-recommended substitute because it maintains all critical electrical specifications while providing a packaged alternative (16-SOIC) to the die form, enabling direct board-level integration without custom die-attach processes.

Parameter Comparison

Parameter	DG303AC/D (Main Part)	DG303ACWE+ (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)	50Ohm	50Ohm	Identical
Voltage - Supply, Dual (V±)	±5V ~ 18V	±5V ~ 18V	Identical
Switch Time (Ton, Toff) (Max)	300ns, 250ns	300ns, 250ns	Identical
Charge Injection	12pC	12pC	Identical
Channel Capacitance (CS(off), CD(off))	14pF, 14pF	14pF, 14pF	Identical
Current - Leakage (IS(off)) (Max)	5nA	5nA	Identical
Crosstalk	-74dB @ 500kHz	-74dB @ 500kHz	Identical
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	Die	16-SOIC (0.295", 7.50mm Width)	Different form factor
Product Status	Obsolete	Active	Substitute is active
RoHS Status	Not specified	ROHS3 Compliant	Substitute has compliance certification
Moisture Sensitivity Level (MSL)	Not specified	1 (Unlimited)	Substitute has MSL rating

Engineering Selection Recommendations

DG303ACWE+ as Primary Substitute:

The DG303ACWE+ is the manufacturer-recommended equivalent for the obsolete DG303AC/D. Selection of this substitute is based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match exactly, including switching circuit configuration, on-state resistance, supply voltage range, switching times, charge injection, capacitance, leakage current, and crosstalk specifications. These parameters ensure functional compatibility in circuit applications.
Product Status: The DG303ACWE+ maintains active product status with current manufacturing and distribution, eliminating supply chain risk associated with the obsolete DG303AC/D.
Compliance and Certification: The DG303ACWE+ carries ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements. The MSL rating of 1 (Unlimited) indicates superior moisture handling for storage and assembly processes.
Package Transition: The transition from die form (DG303AC/D) to 16-SOIC package (DG303ACWE+) requires PCB layout modification but eliminates custom die-attach assembly requirements. The 16-SOIC package is a standard surface-mount form factor compatible with automated assembly equipment.
Inventory Availability: The DG303ACWE+ has 1470 pieces in stock, providing immediate procurement capability compared to the obsolete main part.

Frequently Asked Questions (FAQ)

Q: Can the DG303ACWE+ directly replace the DG303AC/D in existing designs?

A: Electrical substitution is complete. The DG303ACWE+ maintains all switching characteristics, impedance, timing, and signal integrity parameters. Physical substitution requires PCB redesign because the DG303AC/D is a die form requiring custom mounting, while the DG303ACWE+ is a 16-SOIC package compatible with standard surface-mount assembly.

Q: What are the key electrical parameters that define substitution validity?

A: Substitution is valid when the following parameters match: SPDT switch circuit, 2:1 multiplexer configuration, 2 circuits, 50Ohm on-state resistance, ±5V to ±18V dual supply voltage, 300ns/250ns switching times, 12pC charge injection, 14pF channel capacitance, 5nA leakage current, and -74dB crosstalk at 500kHz.

Q: Does the package change from die to 16-SOIC affect circuit performance?

A: No. The 16-SOIC package contains the same die with identical electrical specifications. Package form affects only physical assembly method and PCB layout, not electrical performance or signal characteristics.

Q: What compliance advantages does the DG303ACWE+ provide?

A: The DG303ACWE+ is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. The MSL rating of 1 (Unlimited) provides superior moisture protection during storage and assembly compared to unrated die forms.

Q: Is the DG303ACWE+ suitable for new production designs?

A: Yes. The active product status, full compliance certification, and standard 16-SOIC package make the DG303ACWE+ the appropriate choice for new designs requiring 2-circuit SPDT switching with 50Ohm impedance and ±5V to ±18V supply operation.

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

A: Both the DG303AC/D and DG303ACWE+ operate across 0°C to 70°C ambient temperature range, maintaining all specified electrical parameters within this thermal envelope.

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