DG201BDJ Equivalent & Substitute Parts Reference

Part Overview

The DG201BDJ is a 4-circuit SPST-NC (Single Pole Single Throw - Normally Closed) analog switch IC manufactured by Vishay Siliconix in a 16-DIP package. This component functions as a precision electronic switch with 85Ohm on-state resistance, designed for signal routing and multiplexing applications across industrial and commercial systems.

The DG201BDJ carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support long-term product support for legacy systems utilizing this interface component.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Switch Circuit Type	SPST - NC	—	Defines switch topology; substitutes must match
Number of Circuits	4	—	Channel count; critical for pin compatibility
Multiplexer/Demultiplexer Circuit	1:1	—	Switching configuration; must remain consistent
On-State Resistance (Max)	85	Ohm	Primary electrical parameter; affects signal integrity
Channel-to-Channel Matching (ΔRon)	2	Ohm	Resistance uniformity across channels
Voltage - Supply, Single (V+)	4.5V ~ 25V	V	Operating voltage range; critical for circuit design
Voltage - Supply, Dual (V±)	±4.5V ~ 22V	V	Dual supply capability; determines power architecture
Switch Time (Ton, Toff) (Max)	300ns, 200ns	ns	Switching speed; affects signal bandwidth
Charge Injection	1	pC	Signal distortion parameter
Channel Capacitance (CS(off), CD(off))	5pF, 5pF	pF	Off-state capacitance; affects crosstalk
Current - Leakage (IS(off)) (Max)	500	pA	Off-state leakage; signal integrity parameter
Crosstalk	-95	dB @ 100kHz	Channel isolation; critical for multi-channel applications
Operating Temperature	-40°C ~ 85°C	°C	Thermal operating range
Package / Case	16-DIP (0.300", 7.62mm)	—	Physical form factor; determines PCB compatibility
Mounting Type	Through Hole	—	Assembly method; affects board design
RoHS Status	RoHS non-compliant	—	Regulatory compliance; affects procurement

Substitute Part Grouping Explanation

Substitution of the DG201BDJ is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Switch circuit topology must be SPST - NC
Number of circuits must equal 4
Multiplexer configuration must be 1:1
Package must be 16-DIP (0.300", 7.62mm)
Mounting type must be Through Hole

Secondary Electrical Parameters (Allowable Variation):

On-state resistance (Ron): Substitutes may vary from the 85Ohm specification, provided the application circuit tolerates the difference
Supply voltage ranges: Substitutes may have different voltage specifications; circuit design must accommodate the substitute's voltage requirements
Switch timing (Ton, Toff): Variations are acceptable if system bandwidth requirements are met
Charge injection, capacitance, leakage current, and crosstalk: These parameters may differ; system performance must be validated against substitute specifications

Regulatory and Compliance Parameters:

RoHS compliance status may differ between original and substitute parts
Operating temperature range must encompass the application's thermal requirements

Substitutes are grouped by on-state resistance value, as this parameter most directly affects signal path characteristics and circuit performance.

Parameter Comparison

Part Number	Manufacturer	Ron (Max) Ohm	ΔRon Ohm	V+ Range	V± Range	Ton/Toff (Max) ns	Charge Injection pC	Leakage (Max) pA	Crosstalk dB	Status	RoHS
DG201BDJ	Vishay Siliconix	85	2	4.5V ~ 25V	±4.5V ~ 22V	300, 200	1	500	-95 @ 100kHz	Obsolete	Non-compliant
DG201BDJ-E3	Vishay Siliconix	85	2	4.5V ~ 25V	±4.5V ~ 22V	300, 200	1	500	-95 @ 100kHz	Active	ROHS3 Compliant
ADG201AKNZ	Analog Devices Inc.	90	4.5	10V ~ 15V	±10V ~ 15V	300, 250	20	2000	-80 @ 100kHz	Active	ROHS3 Compliant
ADG201HSJNZ	Analog Devices Inc.	50	1.5	10.8V ~ 16.5V	±13.5V ~ 16.5V	75, 75	10	1000	-86 @ 100kHz	Active	ROHS3 Compliant
ADG201HSKNZ	Analog Devices Inc.	50	1.5	10.8V ~ 16.5V	±13.5V ~ 16.5V	50, 50	10	1000	-86 @ 100kHz	Active	ROHS3 Compliant
ALD4211PCL	Advanced Linear Devices Inc.	135	2.7	3V ~ 12V	±1.5V ~ 6V	130, 130	0.2	100	-90 @ 100kHz	Active	ROHS3 Compliant
DG201ACJ+	Analog Devices Inc./Maxim Integrated	200	—	—	±4.5V ~ 18V	600, 450	20	5000	-90 @ 100kHz	Active	ROHS3 Compliant
DG441DJZ	Renesas Electronics Corporation	85	—	5V ~ 34V	±5V ~ 22V	250, 120	-1	500	-100 @ 1MHz	Active	ROHS3 Compliant
LTC201ACN#PBF	Analog Devices Inc.	125	6.25	5V	±15V	400, 300	8	5000	-90 @ 100kHz	Active	ROHS3 Compliant
MAX4511CPE+	Analog Devices Inc./Maxim Integrated	160	—	9V ~ 36V	±4.5V ~ 18V	500, 400	1.5	500	-66 @ 1MHz	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance):

DG201BDJ-E3 is the direct active replacement for DG201BDJ. This part maintains identical electrical specifications (85Ohm on-state resistance, 4.5V ~ 25V single supply, ±4.5V ~ 22V dual supply) while offering ROHS3 compliance and active product status. The only difference is packaging format (Tube vs. Bulk) and regulatory compliance. This substitute requires no circuit redesign.

Equivalent Substitutes (Matched On-State Resistance):

DG441DJZ (Renesas Electronics Corporation) provides equivalent 85Ohm on-state resistance with active product status and ROHS3 compliance. This part extends the single supply voltage range to 5V ~ 34V and improves crosstalk performance to -100dB @ 1MHz. The dual supply range (±5V ~ 22V) overlaps with the original specification. Switch timing differs slightly (250ns, 120ns vs. 300ns, 200ns), which may affect high-frequency applications. This substitute is suitable for applications where extended voltage range is beneficial.

Functional Alternatives (Different On-State Resistance):

Substitutes with differing on-state resistance values are available for applications where the original 85Ohm specification cannot be met due to supply constraints or where circuit design accommodates resistance variation:

ADG201HSKNZ and ADG201HSJNZ (50Ohm): Lower on-state resistance reduces signal attenuation. Requires narrower supply voltage range (10.8V ~ 16.5V single, ±13.5V ~ 16.5V dual). Faster switching (50ns or 75ns) supports higher-frequency applications. Active status and ROHS3 compliance confirmed.
ADG201AKNZ (90Ohm): Closest resistance match to original (90Ohm vs. 85Ohm). Requires 10V ~ 15V supply range. Active status and ROHS3 compliance confirmed.
ALD4211PCL (135Ohm): Higher on-state resistance with lowest charge injection (0.2pC) and leakage current (100pA). Operates on lower supply voltages (3V ~ 12V single, ±1.5V ~ 6V dual). Active status and ROHS3 compliance confirmed.
LTC201ACN#PBF (125Ohm): Moderate resistance increase. Fixed supply requirements (5V single, ±15V dual). Active status and ROHS3 compliance confirmed.
DG201ACJ+ (200Ohm): Highest on-state resistance. Dual supply only (±4.5V ~ 18V). Slower switching (600ns, 450ns). Active status and ROHS3 compliance confirmed.
MAX4511CPE+ (160Ohm): Obsolete status limits recommendation despite ROHS3 compliance. Extended supply range (9V ~ 36V single, ±4.5V ~ 18V dual) available.

Selection Criteria:

If supply voltage range of original design is 4.5V ~ 25V (single) or ±4.5V ~ 22V (dual), use DG201BDJ-E3 for direct replacement.
If extended voltage range is required, evaluate DG441DJZ (up to 34V single supply).
If lower on-state resistance is required for reduced signal attenuation, evaluate ADG201HSKNZ or ADG201HSJNZ (50Ohm).
If lower supply voltage operation is required, evaluate ALD4211PCL (3V ~ 12V single supply).
All recommended active substitutes carry ROHS3 compliance and current product status.

Frequently Asked Questions (FAQ)

Q1: Can DG201BDJ-E3 be used as a direct replacement for DG201BDJ?

A: Yes. DG201BDJ-E3 maintains identical electrical specifications and package form factor (16-DIP through-hole). The primary differences are packaging format (Tube vs. Bulk) and regulatory compliance (ROHS3 vs. non-compliant). No circuit modifications are required. DG201BDJ-E3 is the recommended replacement due to active product status and current availability.

Q2: What is the primary parameter that determines substitutability?

A: On-state resistance (Ron) is the primary electrical parameter affecting signal path characteristics. The DG201BDJ specifies 85Ohm maximum. Substitutes with different Ron values (50Ohm, 90Ohm, 125Ohm, 135Ohm, 160Ohm, 200Ohm) are functionally equivalent if the application circuit design accommodates the resistance variation. Secondary parameters include supply voltage range, switching speed, and leakage current.

Q3: Are all substitute parts compatible with the original 16-DIP package footprint?

A: Yes. All listed substitutes use the 16-DIP (0.300", 7.62mm) package with through-hole mounting. PCB footprints are identical. Pin assignments for SPST-NC 4-circuit topology are standardized across manufacturers.

Q4: What is the impact of different supply voltage ranges on substitution?

A: The original DG201BDJ operates on 4.5V ~ 25V (single supply) or ±4.5V ~ 22V (dual supply). Substitutes may have narrower or wider voltage ranges. For example, ADG201HSKNZ requires 10.8V ~ 16.5V (single) or ±13.5V ~ 16.5V (dual). Circuit design must ensure the substitute's voltage range encompasses the application's operating point. Substitutes with extended ranges (e.g., DG441DJZ: 5V ~ 34V) offer greater flexibility.

Q5: How do switching speed differences affect substitution?

A: The original DG201BDJ specifies 300ns turn-on and 200ns turn-off. Faster substitutes (e.g., ADG201HSKNZ: 50ns) support higher-frequency signal routing. Slower substitutes (e.g., DG201ACJ+: 600ns, 450ns) may limit bandwidth. Application bandwidth requirements determine acceptable switching speed. High-frequency multiplexing applications benefit from faster switching; low-frequency applications tolerate slower switching.

Q6: What is the significance of charge injection and leakage current parameters?

A: Charge injection (measured in picocoulombs) represents signal distortion when the switch transitions. Lower values (e.g., ALD4211PCL: 0.2pC) produce cleaner signal switching. Leakage current (measured in picoamperes or nanoamperes) represents off-state current. Lower leakage (e.g., ADG201HSKNZ: 1nA) improves signal integrity in high-impedance circuits. Applications requiring precision analog signal routing benefit from lower charge injection and leakage values.

Q7: Why is RoHS compliance status different between the original and substitutes?

A: The original DG201BDJ is RoHS non-compliant (manufactured before RoHS regulations). All active substitutes listed are ROHS3 compliant, reflecting current manufacturing standards. For new designs or systems requiring regulatory compliance, ROHS3-compliant substitutes are mandatory. Legacy systems may continue using non-compliant parts if supply is available.

Q8: Can substitutes with different on-state resistance be used interchangeably?

A: Substitutes with different Ron values are not directly interchangeable without circuit analysis. On-state resistance affects signal attenuation, impedance matching, and power dissipation. Circuit design must be reviewed to confirm the substitute's Ron value is acceptable. For example, a 50Ohm substitute (ADG201HSKNZ) reduces signal loss compared to 85Ohm (DG201BDJ), while a 200Ohm substitute (DG201ACJ+) increases signal loss. Application requirements determine acceptable resistance variation.

Q9: What is the difference between single supply (V+) and dual supply (V±) operation?

A: Single supply (V+) operation uses one positive voltage rail (e.g., 4.5V ~ 25V). Dual supply (V±) operation uses both positive and negative voltage rails (e.g., ±4.5V ~ 22V). The original DG201BDJ supports both modes. Some substitutes support only dual supply (e.g., DG201ACJ+: ±4.5V ~ 18V only). Circuit design determines which supply mode is required. Substitutes must support the application's power architecture.

Q10: How should crosstalk specifications be evaluated when selecting a substitute?

A: Crosstalk measures channel-to-channel signal coupling, expressed in decibels (dB). Higher negative values indicate better isolation. The original DG201BDJ specifies -95dB @ 100kHz. Substitutes range from -66dB (MAX4511CPE+) to -100dB (DG441DJZ). Multi-channel applications requiring high channel isolation benefit from lower crosstalk values. Single-channel applications are less sensitive to crosstalk performance. Measurement frequency (100kHz vs. 1MHz) affects comparison; direct comparison requires identical measurement conditions.

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