DG308BDQ Equivalent & Substitute Parts Reference

Part Overview

The DG308BDQ is a 4-circuit SPST-NO analog switch IC manufactured by Vishay Siliconix in 16-TSSOP surface mount packaging. This part operates with single supply voltage from 4V to 44V or dual supply from ±4V to ±22V, featuring 85Ohm on-state resistance and 200ns/150ns switching times. The DG308BDQ is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility within the SPST-NO 4-circuit switch category while meeting the electrical and mechanical constraints of the application.

Key Parameters

Parameter	DG308BDQ Value	Unit
Switch Circuit Type	SPST - NO	—
Number of Circuits	4	—
Multiplexer/Demultiplexer Circuit	1:1	—
On-State Resistance (Max)	85	Ohm
Channel-to-Channel Matching (ΔRon)	1.7	Ohm
Voltage - Supply, Single (V+)	4V ~ 44V	V
Voltage - Supply, Dual (V±)	±4V ~ ±22V	V
Switch Time (Ton, Toff) (Max)	200, 150	ns
Charge Injection	1	pC
Channel Capacitance (CS(off), CD(off))	5, 5	pF
Current - Leakage (IS(off)) (Max)	500	pA
Crosstalk	-95	dB @ 100kHz
Operating Temperature	-40°C ~ 85°C	°C
Package / Case	16-TSSOP (0.173", 4.40mm Width)	—
Mounting Type	Surface Mount	—
Part Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts for the DG308BDQ are classified into two categories based on electrical parameter compatibility:

Category 1: Direct Parametric Equivalents Parts that maintain identical or near-identical electrical specifications across all critical parameters: SPST-NO 4-circuit configuration, 1:1 multiplexer ratio, 16-TSSOP package, and operating temperature range of -40°C to 85°C or higher. These parts are suitable for direct replacement in applications where the original 85Ohm on-state resistance and associated switching characteristics are required.

Category 2: Functional Substitutes with Modified Electrical Characteristics Parts that maintain the core SPST-NO 4-circuit topology and 16-TSSOP package but feature different on-state resistance values (1.1Ohm, 10Ohm, 15Ohm, or 25Ohm), extended operating temperature ranges, or enhanced performance metrics. These substitutes are applicable when the application can tolerate variations in on-state resistance, switching speed, or other electrical parameters while maintaining the same circuit topology and package footprint.

Key Parameters Determining Substitution Eligibility:

Switch circuit type: SPST - NO (mandatory)
Number of circuits: 4 (mandatory)
Package type: 16-TSSOP surface mount (mandatory)
On-state resistance: 85Ohm (Category 1) or alternative values (Category 2)
Supply voltage range: Must overlap with application requirements
Operating temperature: -40°C minimum; 85°C or higher maximum

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Ohm)	ΔRon (Ohm)	V+ Range (V)	V± Range (V)	Ton/Toff (ns)	Operating Temp (°C)	Status	RoHS
DG308BDQ	Vishay Siliconix	85	1.7	4~44	±4~±22	200, 150	-40~85	Obsolete	Non-compliant
DG308BDQ-E3	Vishay Siliconix	85	1.7	4~44	±4~±22	200, 150	-40~85	Active	ROHS3 Compliant
ADG1612BRUZ	Analog Devices Inc.	1.1	0.03	3.3~16	±3.3~±8	156, 87	-40~125	Active	ROHS3 Compliant
ADG1612BRUZ-REEL	Analog Devices Inc.	1.1	0.03	3.3~16	±3.3~±8	156, 87	-40~125	Active	ROHS3 Compliant
ADG1612BRUZ-REEL7	Analog Devices Inc.	1.1	0.03	3.3~16	±3.3~±8	156, 87	-40~125	Active	ROHS3 Compliant
ADG5412BRUZ	Analog Devices Inc.	10	0.35	9~40	±9~±22	187, 138	-40~125	Active	ROHS3 Compliant
ADG5412BRUZ-REEL7	Analog Devices Inc.	10	0.35	9~40	±9~±22	187, 138	-40~125	Active	ROHS3 Compliant
ADG5412WBRUZ-REEL7	Analog Devices Inc.	15	0.35	9~40	±9~±22	240, 170	-40~125	Active	ROHS3 Compliant
DG445DVZ-T	Renesas Electronics Corporation	85	—	5~34	±5~±22	250, 210	-40~85	Active	ROHS3 Compliant
MAX4712CUE+	Analog Devices Inc./Maxim Integrated	25	0.2	2.7~11	±2.7~±5.5	125, 80	0~70	Active	ROHS3 Compliant
MAX4712CUE+T	Analog Devices Inc./Maxim Integrated	25	0.2	2.7~11	±2.7~±5.5	125, 80	0~70	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Specifications):

The DG308BDQ-E3 is the primary direct replacement for the obsolete DG308BDQ. Both parts maintain 85Ohm on-state resistance, identical supply voltage ranges (4V~44V single, ±4V~±22V dual), and matching switching times (200ns/150ns). The DG308BDQ-E3 is classified as Active and ROHS3 Compliant, addressing the obsolescence and RoHS non-compliance status of the original part. This substitution requires no circuit modifications and maintains full electrical compatibility.

For Applications with Extended Temperature Requirements:

The DG445DVZ-T (Renesas Electronics Corporation) provides 85Ohm on-state resistance matching the DG308BDQ while extending the operating temperature range to -40°C~85°C. Supply voltage range is 5V~34V (single) and ±5~±22V (dual), which overlaps the DG308BDQ range above 5V. Switching times are slightly longer (250ns/210ns versus 200ns/150ns). This part is Active and ROHS3 Compliant. Selection of DG445DVZ-T is appropriate when the application operates within the 5V minimum supply voltage and can tolerate marginally slower switching response.

For Applications Tolerating Lower On-State Resistance:

The ADG1612BRUZ, ADG1612BRUZ-REEL, and ADG1612BRUZ-REEL7 (Analog Devices Inc.) reduce on-state resistance to 1.1Ohm with superior channel matching (30mOhm). These parts operate at 3.3V~16V (single) and ±3.3V~±8V (dual), requiring applications with supply voltages within this narrower range. Operating temperature extends to -40°C~125°C. All variants are Active and ROHS3 Compliant. Selection is appropriate for low-impedance signal switching applications where reduced on-state resistance improves signal integrity.

For Applications Requiring Higher Supply Voltage Tolerance:

The ADG5412BRUZ, ADG5412BRUZ-REEL7, and ADG5412WBRUZ-REEL7 (Analog Devices Inc.) support higher supply voltages (9V~40V single, ±9V~±22V dual) with on-state resistance of 10Ohm (ADG5412 variants) or 15Ohm (ADG5412W variant). Operating temperature extends to -40°C~125°C. All variants are Active and ROHS3 Compliant. The ADG5412WBRUZ-REEL7 includes Automotive grade designation. Selection is appropriate for high-voltage applications where the DG308BDQ's 44V maximum is insufficient.

For Low-Voltage, Low-Power Applications:

The MAX4712CUE+ and MAX4712CUE+T (Analog Devices Inc./Maxim Integrated) feature 25Ohm on-state resistance and operate at 2.7V~11V (single) and ±2.7V~±5.5V (dual). Operating temperature range is 0°C~70°C. Both variants are Active and ROHS3 Compliant. Selection is appropriate for battery-powered or low-voltage applications where the DG308BDQ's minimum 4V supply is excessive.

Frequently Asked Questions (FAQ)

Q1: Can the DG308BDQ-E3 be used as a direct drop-in replacement for the DG308BDQ?

Yes. The DG308BDQ-E3 maintains identical electrical specifications: 85Ohm on-state resistance, 1.7Ohm channel matching, 4V~44V single supply, ±4V~±22V dual supply, and 200ns/150ns switching times. Both use 16-TSSOP surface mount packaging. The primary difference is product status (Active versus Obsolete) and RoHS compliance (ROHS3 Compliant versus Non-compliant). No circuit modifications are required.

Q2: What is the primary reason to substitute the DG308BDQ?

The DG308BDQ is classified as obsolete, indicating discontinued manufacturing and limited availability. Substitution ensures long-term supply chain reliability and compliance with RoHS regulations. The DG308BDQ-E3 provides the most direct path to address obsolescence while maintaining full electrical compatibility.

Q3: How do on-state resistance differences affect circuit performance?

On-state resistance directly impacts signal attenuation, power dissipation, and impedance matching. Lower resistance (1.1Ohm in ADG1612 series) reduces signal loss and heat generation, beneficial for precision analog switching. Higher resistance (85Ohm in DG308BDQ and DG445DVZ-T) is acceptable for applications with higher impedance signal paths. Selection depends on application impedance requirements and acceptable insertion loss.

Q4: Are all substitute parts available in the same packaging?

Yes. All substitute parts listed use 16-TSSOP surface mount packaging with identical footprint dimensions (0.173" width, 4.40mm). PCB layout modifications are not required for package compatibility. However, packaging format (Tube, Cut Tape & Digi-Reel, or Tape & Reel) varies by part number and supplier configuration.

Q5: What supply voltage range should I verify before selecting a substitute?

Verify that the substitute part's supply voltage range encompasses the application's operating voltage. The DG308BDQ operates 4V~44V (single) or ±4V~±22V (dual). Substitutes with narrower ranges (e.g., ADG1612 at 3.3V~16V) require confirmation that the application voltage falls within the specified limits. Substitutes with extended ranges (e.g., ADG5412 at 9V~40V) may require minimum voltage verification.

Q6: Does operating temperature range affect substitute selection?

Yes. The DG308BDQ operates -40°C to 85°C. Substitutes with extended ranges (-40°C to 125°C) provide additional thermal margin but are not required unless the application demands higher temperature operation. Substitutes with reduced ranges (e.g., MAX4712 at 0°C to 70°C) are unsuitable for applications requiring -40°C operation or temperatures above 70°C.

Q7: What is the significance of RoHS compliance in substitute selection?

RoHS3 compliance is mandatory for products sold into regulated markets (EU, China, and others). The DG308BDQ is RoHS non-compliant, creating regulatory risk for new designs. All listed substitutes are ROHS3 Compliant, ensuring compliance with current and future environmental regulations. This is a critical factor for long-term product viability.

Q8: Can I use ADG5412WBRUZ-REEL7 in automotive applications?

Yes. The ADG5412WBRUZ-REEL7 carries Automotive grade designation, indicating qualification for automotive temperature and reliability standards. This part is suitable for automotive switching applications requiring 9V~40V supply voltage and -40°C to 125°C operating temperature. Non-automotive variants (ADG5412BRUZ, ADG5412BRUZ-REEL7) lack this designation and should not be specified for automotive applications without additional qualification.

Q9: What is the difference between ADG1612BRUZ, ADG1612BRUZ-REEL, and ADG1612BRUZ-REEL7?

All three variants are electrically identical with 1.1Ohm on-state resistance and identical electrical specifications. The difference is packaging format: ADG1612BRUZ is supplied in Tube packaging, ADG1612BRUZ-REEL uses standard Cut Tape & Digi-Reel format, and ADG1612BRUZ-REEL7 uses Tape & Reel format. Selection depends on assembly process requirements and supplier availability. Electrical performance is identical across all three variants.

Q10: Is the DG445DVZ-T suitable if my application requires 3V supply voltage?

No. The DG445DVZ-T minimum supply voltage is 5V (single) or ±5V (dual). Applications requiring 3V or 4V operation must use the DG308BDQ-E3 (4V minimum) or ADG1612 series (3.3V minimum). Attempting to operate DG445DVZ-T below 5V will result in out-of-specification performance and potential circuit malfunction.

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