DG221BDY Equivalent & Substitute Parts

Part Overview

The DG221BDY is a 4-circuit SPST-NC (Single Pole Single Throw - Normally Closed) analog switch IC manufactured by Vishay Siliconix, housed in a 16-SOIC surface mount package. This component functions as a precision analog multiplexer/demultiplexer with 90Ohm on-state resistance and operates across a wide supply voltage range of 13V to 18V (single supply) or ±7V to ±18V (dual supply).

The DG221BDY is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Suitable alternatives are available from Analog Devices Inc., offering improved specifications, active product status, and enhanced RoHS compliance.

Key Parameters

Parameter	DG221BDY
Manufacturer	Vishay Siliconix
Product Status	Obsolete
Switch Circuit	SPST - NC
Number of Circuits	4
On-State Resistance (Max)	90Ohm
Voltage - Supply, Single (V+)	13V ~ 18V
Voltage - Supply, Dual (V±)	±7V ~ 18V
Switch Time (Ton, Toff) (Max)	550ns, 340ns
Charge Injection	20pC
Current - Leakage (IS(off)) (Max)	5nA
Crosstalk	-90dB @ 100kHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the DG221BDY is determined by the following critical parameters:

Switch Circuit Configuration: SPST - NC topology (4 circuits)
On-State Resistance: 90Ohm maximum
Package Type: 16-SOIC surface mount form factor
Operating Temperature Range: -40°C to 85°C
Charge Injection & Leakage: Electrical performance characteristics
Supply Voltage Compatibility: Single and dual supply operation

All substitute parts listed maintain identical switch circuit topology, circuit count, on-state resistance, package form factor, and operating temperature range. Variations in supply voltage ranges, switch timing, and leakage current specifications are documented in the parameter comparison table below.

Parameter Comparison

Parameter	DG221BDY	ADG201AKRZ-REEL	ADG221KRZ	LTC221CS#PBF	LTC221CS#TRPBF
Manufacturer	Vishay Siliconix	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active
Switch Circuit	SPST - NC	SPST - NC	SPST - NC	SPST - NC	SPST - NC
Number of Circuits	4	4	4	4	4
On-State Resistance (Max)	90Ohm	90Ohm	90Ohm	90Ohm	90Ohm
Channel-to-Channel Matching (ΔRon)	-	4.5Ohm	4.5Ohm	-	-
Voltage - Supply, Single (V+)	13V ~ 18V	10V ~ 15V	15V	5V	5V
Voltage - Supply, Dual (V±)	±7V ~ 18V	±10V ~ 15V	±15V	±15V	±15V
Switch Time (Ton, Toff) (Max)	550ns, 340ns	300ns, 250ns	350ns, 250ns	400ns, 300ns	400ns, 300ns
Charge Injection	20pC	20pC	20pC	8pC	8pC
Channel Capacitance (CS(off), CD(off))	8pF, 9pF	5pF	5pF, 5pF	5pF, 12pF	5pF, 12pF
Current - Leakage (IS(off)) (Max)	5nA	2nA	2nA	5nA	5nA
Crosstalk	-90dB @ 100kHz	-80dB @ 100kHz	-80dB @ 100kHz	-90dB @ 100kHz	-90dB @ 100kHz
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Package / Case	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)
Packaging Type	-	Tape & Reel (TR)	Tube	Tube	Tape & Reel (TR)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

ADG201AKRZ-REEL is suitable for applications requiring improved switch timing performance (300ns/250ns) and lower leakage current (2nA). This part operates within a narrower supply voltage range (10V ~ 15V single, ±10V ~ 15V dual) compared to the DG221BDY. Tape & Reel packaging supports high-volume production. ROHS3 compliance is achieved.

ADG221KRZ provides the closest electrical performance match to the DG221BDY with identical on-state resistance and charge injection specifications. Supply voltage is fixed at 15V (single) and ±15V (dual), with improved switch timing (350ns/250ns) and reduced leakage current (2nA). Tube packaging is standard. ROHS3 compliance is achieved. This part offers the most direct functional replacement.

LTC221CS#PBF and LTC221CS#TRPBF are functionally equivalent with identical crosstalk performance (-90dB @ 100kHz) and lower charge injection (8pC). These parts operate at lower supply voltages (5V single, ±15V dual) and feature reduced operating temperature range (0°C ~ 70°C). Switch timing is slightly slower (400ns/250ns). LTC221CS#TRPBF is supplied in Tape & Reel format; LTC221CS#PBF is supplied in Tube format. Both achieve ROHS3 compliance.

All substitute parts maintain identical 16-SOIC package geometry, MSL rating, and REACH compliance status. Selection should be based on supply voltage requirements, operating temperature range, and packaging format needs.

Frequently Asked Questions (FAQ)

Q: Can ADG201AKRZ-REEL be used as a direct replacement for DG221BDY?

A: ADG201AKRZ-REEL is functionally compatible but operates within a narrower supply voltage range (10V ~ 15V single supply versus 13V ~ 18V for DG221BDY). Verify that your application's supply voltage falls within the ADG201AKRZ-REEL operating range before substitution.

Q: What is the primary difference between ADG221KRZ and LTC221CS#PBF?

A: ADG221KRZ operates at higher supply voltages (15V single, ±15V dual) with a wider operating temperature range (-40°C ~ 85°C). LTC221CS#PBF operates at lower supply voltages (5V single, ±15V dual) with a narrower operating temperature range (0°C ~ 70°C). Select based on your circuit's supply voltage and temperature requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (ADG201AKRZ-REEL, ADG221KRZ, LTC221CS#PBF, LTC221CS#TRPBF) are ROHS3 compliant. The original DG221BDY is RoHS non-compliant.

Q: What packaging options are available?

A: ADG201AKRZ-REEL and LTC221CS#TRPBF are supplied in Tape & Reel (TR) format for automated assembly. ADG221KRZ and LTC221CS#PBF are supplied in Tube format for manual handling or lower-volume applications.

Q: Do all substitute parts use the same 16-SOIC package?

A: Yes. All substitute parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package, ensuring PCB layout compatibility with the original DG221BDY design.

Q: Which substitute part offers the fastest switch timing?

A: ADG201AKRZ-REEL provides the fastest switch timing with Ton/Toff specifications of 300ns/250ns, compared to 550ns/340ns for the original DG221BDY.

Q: Can LTC221CS parts be used in applications requiring -40°C operation?

A: No. LTC221CS#PBF and LTC221CS#TRPBF operate within the 0°C ~ 70°C temperature range and are not suitable for applications requiring -40°C operation. Use ADG201AKRZ-REEL or ADG221KRZ for extended low-temperature operation.

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