DG201BDY Equivalent & Substitute Parts

Part Overview

The DG201BDY is a 4-circuit SPST-NC (Single Pole Single Throw - Normally Closed) analog switch IC manufactured by Vishay Siliconix in 16-SOIC surface mount package. This component operates across a wide supply voltage range (4.5V to 25V single supply, or ±4.5V to ±22V dual supply) with 85Ohm on-state resistance and is designed for signal routing and multiplexing applications in analog circuits.

The DG201BDY is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and meet current RoHS compliance requirements. Active alternatives with comparable or enhanced electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NC (Single Pole Single Throw - Normally Closed)
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	85Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm
Voltage - Supply, Single (V+)	4.5V ~ 25V
Voltage - Supply, Dual (V±)	±4.5V ~ 22V
Switch Time (Ton, Toff) (Max)	300ns, 200ns
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-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DG201BDY is determined by the following critical parameters:

Electrical Compatibility Criteria:

Switch circuit type: SPST - NC (4 circuits, 1:1 configuration)
Package type: 16-SOIC surface mount form factor
Operating temperature range: -40°C to 85°C minimum
On-state resistance: 85Ohm nominal (tolerance range determines functional equivalence)
Supply voltage compatibility: Single supply 4.5V-25V or dual supply ±4.5V-±22V

Compliance & Availability Criteria:

RoHS3 compliance status (preferred for new designs)
Active product status (ensures ongoing availability)
Moisture sensitivity level: MSL 1 (unlimited shelf life)

Substitute parts are grouped into three categories based on on-state resistance characteristics:

Direct Equivalents (85Ohm class): DG201BDY-E3 — identical electrical specifications with improved RoHS compliance and active status.
Functional Equivalents (90Ohm class): ADG201AKRZ, ADG201AKRZ-REEL, ADG201AKRZ-REEL7 — Analog Devices parts with slightly higher on-state resistance (90Ohm) but narrower supply voltage range (10V-15V single, ±10V-±15V dual). Suitable for applications where supply voltage is within the specified range.
Enhanced Performance Alternatives (50Ohm class): ADG201HSKRZ, ADG201HSKRZ-REEL — Lower on-state resistance (50Ohm) with faster switching times (50ns vs. 300ns/200ns), narrower supply voltage range (10.8V-16.5V single, ±13.5V-±16.5V dual). Suitable for low-impedance signal routing applications.
Extended Resistance Range: ALD4211SCL (135Ohm), DG201ACSE+, DG201ACSE+T, DG201ADY+ (200Ohm) — Higher on-state resistance variants for applications tolerant of increased channel impedance.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	ΔRon (Max)	V+ Supply	V± Supply	Ton/Toff (Max)	Charge Injection	Leakage (Max)	Crosstalk	Temp Range	Package	Status	RoHS
DG201BDY	Vishay Siliconix	85Ohm	2Ohm	4.5V-25V	±4.5V-±22V	300ns/200ns	1pC	500pA	-95dB	-40°C to 85°C	16-SOIC	Obsolete	Non-compliant
DG201BDY-E3	Vishay Siliconix	85Ohm	2Ohm	4.5V-25V	±4.5V-±22V	300ns/200ns	1pC	500pA	-95dB	-40°C to 85°C	16-SOIC	Active	ROHS3
ADG201AKRZ	Analog Devices Inc.	90Ohm	4.5Ohm	10V-15V	±10V-±15V	300ns/250ns	20pC	2nA	-80dB	-40°C to 85°C	16-SOIC	Active	ROHS3
ADG201AKRZ-REEL	Analog Devices Inc.	90Ohm	4.5Ohm	10V-15V	±10V-±15V	300ns/250ns	20pC	2nA	-80dB	-40°C to 85°C	16-SOIC	Active	ROHS3
ADG201AKRZ-REEL7	Analog Devices Inc.	90Ohm	4.5Ohm	10V-15V	±10V-±15V	300ns/250ns	20pC	2nA	-80dB	-40°C to 85°C	16-SOIC	Active	ROHS3
ADG201HSKRZ	Analog Devices Inc.	50Ohm	1.5Ohm	10.8V-16.5V	±13.5V-±16.5V	50ns/50ns	10pC	1nA	-86dB	-40°C to 85°C	16-SOIC	Active	ROHS3
ADG201HSKRZ-REEL	Analog Devices Inc.	50Ohm	1.5Ohm	10.8V-16.5V	±13.5V-±16.5V	50ns/50ns	10pC	1nA	-86dB	-40°C to 85°C	16-SOIC	Active	ROHS3
ALD4211SCL	Advanced Linear Devices Inc.	135Ohm	2.7Ohm	3V-12V	±1.5V-±6V	130ns/130ns	0.2pC	100pA	-90dB	-40°C to 85°C	16-SOIC	Active	ROHS3
DG201ACSE+	Analog Devices Inc./Maxim Integrated	200Ohm	—	—	±4.5V-±18V	600ns/450ns	20pC	5nA	-90dB	0°C to 70°C	16-SOIC	Active	ROHS3
DG201ACSE+T	Analog Devices Inc./Maxim Integrated	200Ohm	—	—	±4.5V-±18V	600ns/450ns	20pC	5nA	-90dB	0°C to 70°C	16-SOIC	Active	ROHS3
DG201ADY+	Analog Devices Inc./Maxim Integrated	200Ohm	—	—	±4.5V-±18V	600ns/450ns	20pC	5nA	-90dB	-40°C to 85°C	16-SOIC	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation: DG201BDY-E3

DG201BDY-E3 is the direct equivalent replacement. It maintains identical electrical specifications (85Ohm on-state resistance, 4.5V-25V single supply, ±4.5V-±22V dual supply) while providing active product status and ROHS3 compliance. This part is suitable for all applications currently using DG201BDY without circuit modification.

Alternative Selections Based on Application Requirements:

For applications operating within 10V-15V single supply or ±10V-±15V dual supply ranges, the ADG201AKRZ series (including REEL and REEL7 packaging variants) provides active status and ROHS3 compliance. The 90Ohm on-state resistance represents a 5.9% increase over the original specification and is acceptable for most signal routing applications where impedance matching is not critical.

For low-impedance signal routing applications requiring faster switching performance, ADG201HSKRZ and ADG201HSKRZ-REEL offer 50Ohm on-state resistance with 50ns switching times. These parts require supply voltages within 10.8V-16.5V (single) or ±13.5V-±16.5V (dual) ranges.

For applications with extended operating temperature requirements below 0°C or above 70°C, DG201ADY+ supports -40°C to 85°C range with 200Ohm on-state resistance and dual supply operation (±4.5V-±18V).

All recommended substitutes are ROHS3 compliant and carry active product status, ensuring long-term supply chain availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can DG201BDY-E3 be used as a direct drop-in replacement for DG201BDY?

A: Yes. DG201BDY-E3 maintains identical electrical specifications and 16-SOIC package form factor. No circuit modifications are required. The primary differences are active product status and ROHS3 compliance.

Q: What is the key difference between DG201BDY and ADG201AKRZ?

A: The primary difference is supply voltage range. DG201BDY operates from 4.5V-25V (single) or ±4.5V-±22V (dual), while ADG201AKRZ operates from 10V-15V (single) or ±10V-±15V (dual). On-state resistance increases from 85Ohm to 90Ohm. ADG201AKRZ is suitable only for applications where supply voltage remains within its specified range.

Q: Why does ADG201HSKRZ have lower on-state resistance than the original DG201BDY?

A: ADG201HSKRZ is a performance-enhanced variant designed for low-impedance signal routing. The 50Ohm on-state resistance (versus 85Ohm) enables lower insertion loss and faster switching times (50ns versus 300ns/200ns). This part requires narrower supply voltage range (10.8V-16.5V single, ±13.5V-±16.5V dual).

Q: Are all substitute parts available in the same 16-SOIC package?

A: Yes. All listed substitute parts use 16-SOIC (0.154", 3.90mm width) surface mount package, ensuring mechanical compatibility with existing PCB layouts.

Q: What packaging options are available for the recommended substitutes?

A: DG201BDY-E3 is available in Tube packaging. ADG201AKRZ series offers Tube (AKRZ), Tape & Reel (AKRZ-REEL), and Cut Tape & Digi-Reel (AKRZ-REEL7) options. ADG201HSKRZ is available in Tube and Cut Tape & Digi-Reel packaging. Select packaging based on production volume and assembly requirements.

Q: Is RoHS compliance a factor in selecting a substitute?

A: Yes. DG201BDY is RoHS non-compliant. All active substitute parts listed (DG201BDY-E3, ADG201 series, ALD4211SCL, DG201AC/AD series) are ROHS3 compliant, meeting current regulatory requirements for new designs and manufacturing.

Q: Can DG201ACSE+ or DG201ADY+ be used in place of DG201BDY?

A: These parts are functionally compatible but operate with 200Ohm on-state resistance (versus 85Ohm) and dual supply only (±4.5V-±18V). They are suitable only for applications where higher channel impedance is acceptable and dual supply operation is available. DG201ACSE+ has reduced operating temperature range (0°C-70°C) compared to DG201ADY+ (-40°C-85°C).

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