DG308BDJ Equivalent & Substitute Parts

Part Overview

The DG308BDJ is a 4-circuit SPST-NO IC switch manufactured by Vishay Siliconix, designed for analog signal switching applications requiring low on-state resistance and fast switching performance. This component features an 85Ohm maximum on-state resistance, operates across a wide supply voltage range (4V to 44V single supply, ±4V to ±22V dual supply), and is housed in a 16-DIP package. The DG308BDJ is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO (Single Pole Single Throw - Normally Open)
Number of Circuits	4
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	85Ohm
Channel-to-Channel Matching (ΔRon)	1.7Ohm
Voltage - Supply, Single (V+)	4V ~ 44V
Voltage - Supply, Dual (V±)	±4V ~ 22V
Switch Time (Ton, Toff) (Max)	200ns, 150ns
Charge Injection	1pC
Channel Capacitance (CS(off), CD(off))	5pF, 5pF
Current - Leakage (IS(off)) (Max)	500pA
Crosstalk	-95dB @ 100kHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the DG308BDJ are classified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Switch circuit type (SPST - NO)
Number of circuits (4)
Multiplexer/Demultiplexer configuration (1:1)
Package type (16-DIP, 0.300", 7.62mm)
Mounting type (Through Hole)

Secondary Compatibility Parameters:

On-state resistance (85Ohm nominal, with tolerance variations acceptable within application requirements)
Supply voltage ranges (single and dual supply capability)
Operating temperature range
Switching speed characteristics (Ton, Toff)
Leakage current specifications

Substitutes are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (functionally compatible with specification variations).

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	ΔRon (Max)	V+ Supply Range	V± Supply Range	Ton/Toff (Max)	Charge Injection	IS(off) (Max)	Operating Temp	Product Status	RoHS Status
DG308BDJ	Vishay Siliconix	85Ohm	1.7Ohm	4V ~ 44V	±4V ~ 22V	200ns, 150ns	1pC	500pA	-40°C ~ 85°C	Obsolete	RoHS non-compliant
DG308BDJ-E3	Vishay Siliconix	85Ohm	1.7Ohm	4V ~ 44V	±4V ~ 22V	200ns, 150ns	1pC	500pA	-40°C ~ 85°C	Active	ROHS3 Compliant
MAX362CPE+	Analog Devices Inc./Maxim Integrated	85Ohm	2Ohm	10V ~ 30V	±4.5V ~ 20V	250ns, 120ns	5pC	500pA	0°C ~ 70°C	Active	ROHS3 Compliant
ALD4202MPCL	Advanced Linear Devices Inc.	135Ohm	2.7Ohm	3V ~ 12V	±1.5V ~ 6V	240ns, 130ns	2pC	100pA	0°C ~ 70°C	Active	ROHS3 Compliant
ALD4212PCL	Advanced Linear Devices Inc.	135Ohm	2.7Ohm	3V ~ 12V	±1.5V ~ 6V	130ns, 130ns	0.2pC	100pA	-40°C ~ 85°C	Active	ROHS3 Compliant
MAX4552CPE+	Analog Devices Inc./Maxim Integrated	120Ohm	1Ohm	2V ~ 12V	±2V ~ 6V	110ns, 90ns	2pC	1nA	0°C ~ 70°C	Obsolete	ROHS3 Compliant
DG308ACJ+	Analog Devices Inc./Maxim Integrated	100Ohm	—	5V ~ 30V	±5V ~ 20V	250ns, 150ns	-10pC	5nA	0°C ~ 70°C	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalent: DG308BDJ-E3 is the recommended primary substitute. It provides identical electrical specifications to the DG308BDJ while offering active product status and ROHS3 compliance. This part is suitable for direct replacement in all applications where the original DG308BDJ was specified.

Active Product Alternatives: For new designs requiring active product support, MAX362CPE+ and ALD4212PCL are viable alternatives. MAX362CPE+ maintains the 85Ohm on-state resistance specification and is suitable for applications operating within its 10V to 30V single supply range. ALD4212PCL offers extended operating temperature range (-40°C to 85°C) matching the original part, though with higher on-state resistance (135Ohm) and more restricted supply voltage ranges.

Compliance Considerations: All substitute parts listed are ROHS3 compliant, addressing the RoHS non-compliance status of the original DG308BDJ. Selection should prioritize parts with active product status for long-term availability and manufacturing support.

Temperature Range Constraints: Applications requiring the full -40°C to 85°C operating temperature range are limited to DG308BDJ-E3 and ALD4212PCL among active products. MAX362CPE+ and other alternatives operate only to 0°C to 70°C.

Frequently Asked Questions (FAQ)

Q: Can DG308BDJ-E3 be used as a direct replacement for DG308BDJ? A: Yes. DG308BDJ-E3 is a parametric equivalent with identical electrical specifications. The primary differences are active product status and ROHS3 compliance. Pin configuration and package dimensions are identical.

Q: What are the key differences between the DG308BDJ and MAX362CPE+? A: Both parts feature 85Ohm on-state resistance and 4-circuit SPST-NO configuration in 16-DIP packages. MAX362CPE+ has a narrower single supply voltage range (10V to 30V versus 4V to 44V) and restricted operating temperature (0°C to 70°C versus -40°C to 85°C). MAX362CPE+ offers faster turn-off time (120ns versus 150ns) and lower crosstalk (-100dB @ 1MHz versus -95dB @ 100kHz).

Q: Are ALD4202MPCL and ALD4212PCL interchangeable? A: Both are 4-circuit SPST-NO switches in 16-DIP packages with 135Ohm on-state resistance. ALD4212PCL offers superior switching performance (130ns turn-on/off versus 240ns/130ns) and significantly lower charge injection (0.2pC versus 2pC). ALD4212PCL supports the extended -40°C to 85°C temperature range, while ALD4202MPCL operates only to 0°C to 70°C. Selection depends on application temperature requirements and switching speed demands.

Q: What supply voltage constraints apply when substituting the DG308BDJ? A: The original DG308BDJ operates from 4V to 44V (single supply) or ±4V to ±22V (dual supply). MAX362CPE+ requires minimum 10V single supply. ALD4202MPCL and ALD4212PCL operate from 3V to 12V single supply or ±1.5V to ±6V dual supply. Verify application supply voltages fall within the selected substitute's operating range.

Q: Is packaging identical across all substitute parts? A: All listed substitutes use 16-DIP (0.300", 7.62mm) through-hole packages with identical pin configurations. PCB layout modifications are not required for mechanical compatibility.

Q: Which substitute offers the best leakage current performance? A: ALD4202MPCL and ALD4212PCL both specify 100pA maximum leakage current, superior to the DG308BDJ's 500pA specification. MAX4552CPE+ specifies 1nA leakage current. DG308ACJ+ specifies 5nA leakage current.

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