DG309DJ Equivalent & Substitute Parts

Part Overview

The DG309DJ is a 4-circuit IC switch manufactured by Analog Devices Inc./Maxim Integrated, configured as a SPST-NC (Single Pole Single Throw - Normally Closed) device with 100Ohm on-state resistance in a 16-DIP package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. The part operates across a wide supply voltage range (5V to 30V single supply, or ±5V to ±20V dual supply) and is suitable for analog switching applications requiring low on-state resistance and fast switching performance.

Key Parameters

Parameter	Value
Manufacturer Part Number	DG309DJ
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Interface
Switch Circuit Type	SPST - NC
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	100Ohm
Voltage - Supply, Single (V+)	5V ~ 30V
Voltage - Supply, Dual (V±)	±5V ~ 20V
Switch Time (Ton, Toff) (Max)	250ns, 150ns
Charge Injection	-10pC
Channel Capacitance (CS(off), CD(off))	11pF, 8pF
Current - Leakage (IS(off)) (Max)	5nA
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	16-DIP (0.300", 7.62mm)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the DG309DJ is determined by the following critical parameters:

Switch Circuit Configuration: The DG309DJ operates as SPST-NC (Normally Closed). Substitute parts must maintain compatible switching logic for the application.
Number of Circuits and Multiplexer Ratio: All candidates maintain 4 circuits in a 1:1 multiplexer configuration.
On-State Resistance: The DG309DJ specifies 100Ohm maximum. Substitutes with higher on-state resistance may be acceptable depending on application current requirements.
Package and Mounting: All candidates use 16-DIP through-hole packaging, ensuring mechanical and electrical compatibility.
Operating Temperature Range: The DG309DJ operates from -40°C to 85°C. Substitutes must support this range or a compatible subset.
Supply Voltage Compatibility: Dual supply operation (±5V to ±20V) is the primary operating mode for this device class.

Two substitute parts are identified based on these parameters:

DG212DJ+: Active product with SPST-NO configuration, 175Ohm on-state resistance, dual supply operation (±4.5V to ±18V), and RoHS3 compliance.

DG308ACJ+: Obsolete product with SPST-NO configuration, 100Ohm on-state resistance matching the main part, dual supply operation (±5V to ±20V), and RoHS3 compliance.

Parameter Comparison

Parameter	DG309DJ (Main)	DG212DJ+	DG308ACJ+
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Switch Circuit Type	SPST - NC	SPST - NO	SPST - NO
Number of Circuits	4	4	4
Multiplexer/Demultiplexer Circuit	1:1	1:1	1:1
On-State Resistance (Max)	100Ohm	175Ohm	100Ohm
Voltage - Supply, Dual (V±)	±5V ~ 20V	±4.5V ~ 18V	±5V ~ 20V
Switch Time (Ton, Toff) (Max)	250ns, 150ns	1µs, 500ns	250ns, 150ns
Charge Injection	-10pC	Not specified	-10pC
Channel Capacitance (CS(off), CD(off))	11pF, 8pF	5pF, 5pF	11pF, 8pF
Current - Leakage (IS(off)) (Max)	5nA	5nA	5nA
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	0°C ~ 70°C (TA)
Package / Case	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)
Product Status	Obsolete	Active	Obsolete
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

DG212DJ+ is the preferred substitute for new designs and long-term procurement. This part is active in production, ensuring availability and supply chain stability. It carries RoHS3 compliance, meeting modern environmental and regulatory requirements. The 175Ohm on-state resistance represents a 75% increase over the DG309DJ; applications with strict current-handling requirements or low-impedance signal paths should evaluate this parameter against circuit specifications. The dual supply voltage range (±4.5V to ±18V) is slightly narrower than the DG309DJ but remains compatible with standard ±15V and ±12V supply configurations. Switch timing is slower (1µs turn-on, 500ns turn-off versus 250ns and 150ns), which may impact high-frequency switching applications. Channel capacitance is reduced (5pF versus 11pF and 8pF), potentially improving performance in capacitive-sensitive circuits.

DG308ACJ+ provides parameter matching closer to the DG309DJ, with identical on-state resistance (100Ohm), charge injection (-10pC), and channel capacitance specifications. However, this part is obsolete and carries the same RoHS non-compliance status as the main part. The operating temperature range is restricted to 0°C to 70°C, eliminating low-temperature operation below 0°C. This substitute is suitable only for legacy system maintenance where supply chain access exists and environmental compliance is not a constraint.

Frequently Asked Questions (FAQ)

Q: Can DG212DJ+ directly replace DG309DJ in existing circuits?

A: Mechanical and electrical pin compatibility is maintained. However, the DG212DJ+ has SPST-NO (Normally Open) logic versus the DG309DJ's SPST-NC (Normally Closed) configuration. Circuit logic must be evaluated to determine if this switching polarity change is acceptable. Additionally, the 175Ohm on-state resistance is higher; verify that application current requirements do not exceed acceptable voltage drop limits.

Q: What is the difference between SPST-NC and SPST-NO configurations?

A: SPST-NC (Normally Closed) means the switch contact is closed when no control signal is applied, opening only when activated. SPST-NO (Normally Open) means the switch contact is open when no control signal is applied, closing only when activated. These are opposite logic states and require circuit redesign if substitution is necessary.

Q: Is DG308ACJ+ a viable long-term substitute?

A: DG308ACJ+ is obsolete and shares the RoHS non-compliance status of the DG309DJ. It is not recommended for new designs or long-term procurement. Use only for legacy system maintenance where existing inventory or supply chain access is available.

Q: How does the 175Ohm on-state resistance of DG212DJ+ affect circuit performance?

A: Higher on-state resistance increases voltage drop across the switch at a given current level. For analog signal switching, this may introduce signal attenuation. For digital logic switching, verify that the voltage drop remains within acceptable logic level margins. Calculate actual voltage drop using the formula: V_drop = I × R_on, where I is the maximum expected current through the switch.

Q: Are all three parts available in the same 16-DIP package?

A: Yes. All three parts use 16-DIP (0.300", 7.62mm) through-hole packaging, ensuring mechanical compatibility on PCBs designed for the DG309DJ.

Q: What is the significance of RoHS3 compliance in DG212DJ+ and DG308ACJ+?

A: RoHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive, restricting the use of specific hazardous materials in electrical and electronic equipment. The DG309DJ is RoHS non-compliant. For applications subject to environmental regulations or customer requirements mandating RoHS compliance, DG212DJ+ is the only compliant option among the three parts.

Q: Does the reduced channel capacitance of DG212DJ+ provide any advantage?

A: Lower channel capacitance (5pF versus 11pF and 8pF) reduces parasitic loading on signal paths, which can improve performance in high-impedance circuits or high-frequency applications. This is particularly beneficial for precision analog signal switching where capacitive coupling introduces unwanted signal distortion.

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