DG201BAK Equivalent & Substitute Parts

Part Overview

The DG201BAK is a 4-circuit SPST-NC (Normally Closed) analog switch IC manufactured by Vishay Siliconix, housed in a 16-CERDIP package. This component functions as a precision electronic switch with 85Ohm on-state resistance and operates across a wide supply voltage range of ±4.5V to ±22V. The DG201BAK is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NC (Normally Closed)
Number of Circuits	4
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	85Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm
Voltage - Supply, Dual (V±)	±4.5V ~ 22V
Switch Time - Ton (Max)	300ns
Switch Time - Toff (Max)	200ns
Charge Injection	1pC
Channel Capacitance (CS(off), CD(off))	5pF, 5pF
Current - Leakage (IS(off)) (Max)	500pA
Crosstalk	-95dB @ 100kHz
Operating Temperature Range	-55°C ~ 125°C (TA)
Mounting Type	Through Hole
Package / Case	16-CERDIP (0.300", 7.62mm)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the DG201BAK is determined by the following critical parameters:

Switch Circuit Type: Must be SPST - NC (Normally Closed)
Number of Circuits: Must be 4
Multiplexer/Demultiplexer Configuration: Must be 1:1
On-State Resistance (Max): Must not exceed 85Ohm for direct drop-in replacement
Dual Supply Voltage Range: Must support ±4.5V minimum and ±18V or higher
Operating Temperature Range: Must encompass -55°C to 125°C
Mounting Type: Must be Through Hole
Package Compatibility: 16-pin DIP-family packages (16-CERDIP, 16-CDIP, 16-PDIP) are mechanically compatible

Two substitute parts meet these criteria:

DG201AAK/883B (Analog Devices Inc./Maxim Integrated): Matches core switch topology and pin configuration. On-state resistance of 175Ohm exceeds the DG201BAK specification but maintains the same circuit architecture and dual supply voltage support (±4.5V ~ 18V). Active product status ensures continued availability.

DG444DJ+ (Analog Devices Inc./Maxim Integrated): Matches on-state resistance (85Ohm) and core switch topology. Operates with dual supply voltage range of ±4.5V ~ 20V. Package is 16-PDIP rather than 16-CERDIP, but both are 16-pin through-hole DIP variants with identical 0.300" (7.62mm) pitch and are mechanically interchangeable on standard PCB layouts. Active product status and RoHS3 compliance provide long-term supply assurance.

Parameter Comparison

Parameter	DG201BAK	DG201AAK/883B	DG444DJ+
Manufacturer	Vishay Siliconix	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete	Active	Active
Switch Circuit Type	SPST - NC	SPST - NC	SPST - NC
Number of Circuits	4	4	4
Multiplexer/Demultiplexer Configuration	1:1	1:1	1:1
On-State Resistance (Max)	85Ohm	175Ohm	85Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm	Not specified	4Ohm (Max)
Voltage - Supply, Dual (V±)	±4.5V ~ 22V	±4.5V ~ 18V	±4.5V ~ 20V
Switch Time - Ton (Max)	300ns	600ns	250ns
Switch Time - Toff (Max)	200ns	450ns	140ns
Charge Injection	1pC	20pC	5pC
Channel Capacitance (CS(off), CD(off))	5pF, 5pF	5pF, 5pF	4pF, 4pF
Current - Leakage (IS(off)) (Max)	500pA	1nA	500pA
Crosstalk	-95dB @ 100kHz	-90dB @ 100kHz	-100dB @ 1MHz
Operating Temperature Range	-55°C ~ 125°C (TA)	-55°C ~ 125°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	16-CERDIP (0.300", 7.62mm)	16-CDIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)
RoHS Status	RoHS non-compliant	RoHS non-compliant	RoHS3 Compliant

Engineering Selection Recommendations

DG444DJ+ is the preferred substitute for new designs and ongoing system support. This part maintains electrical equivalence in on-state resistance (85Ohm), operates within the required dual supply voltage range (±4.5V ~ 20V), and is actively manufactured by Analog Devices Inc./Maxim Integrated. The 16-PDIP package is mechanically compatible with standard through-hole PCB layouts. RoHS3 compliance satisfies modern environmental and regulatory requirements. The operating temperature range of -40°C ~ 85°C is narrower than the DG201BAK; applications requiring -55°C operation must evaluate thermal requirements independently.

DG201AAK/883B serves as an alternative when supply constraints or specific design requirements necessitate a different part. This active product maintains the full -55°C ~ 125°C operating temperature range and dual supply voltage support (±4.5V ~ 18V). The higher on-state resistance of 175Ohm and increased charge injection (20pC) represent performance trade-offs that must be evaluated against circuit requirements. The 16-CDIP package is mechanically compatible with standard through-hole layouts.

Both substitute parts are active products with established supply chains, eliminating the obsolescence risk associated with the DG201BAK.

Frequently Asked Questions (FAQ)

Q: Can DG444DJ+ directly replace DG201BAK in existing PCB layouts?

A: Yes. Both parts use 16-pin through-hole DIP packages with identical 0.300" (7.62mm) pitch. The pin configuration and functional topology are compatible. However, verify that the operating temperature range of -40°C ~ 85°C meets your application requirements, as the DG201BAK supports -55°C ~ 125°C.

Q: What is the impact of DG444DJ+ having 85Ohm on-state resistance versus DG201AAK/883B at 175Ohm?

A: On-state resistance directly affects signal attenuation and power dissipation in the switch path. DG444DJ+ at 85Ohm provides lower insertion loss and reduced heat generation, making it suitable for applications sensitive to signal integrity or power efficiency. DG201AAK/883B at 175Ohm introduces higher attenuation and is appropriate only for applications where this resistance level is acceptable.

Q: Does the narrower operating temperature range of DG444DJ+ (-40°C ~ 85°C) affect compatibility?

A: DG444DJ+ is suitable for applications operating within -40°C ~ 85°C. If your system requires operation at -55°C or above 85°C, DG201AAK/883B (-55°C ~ 125°C) is the appropriate choice.

Q: Are there differences in switch timing between the substitutes?

A: Yes. DG444DJ+ offers faster switching (Ton 250ns, Toff 140ns) compared to DG201BAK (Ton 300ns, Toff 200ns) and DG201AAK/883B (Ton 600ns, Toff 450ns). Faster switching in DG444DJ+ reduces propagation delay and may improve system performance in time-sensitive applications.

Q: What is the significance of charge injection differences?

A: Charge injection represents the amount of charge transferred to the signal path during switching transitions. DG201BAK exhibits 1pC, DG444DJ+ 5pC, and DG201AAK/883B 20pC. Lower charge injection reduces signal distortion and is preferred in precision analog applications. Applications with relaxed signal fidelity requirements are less sensitive to these differences.

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

A: DG444DJ+ is RoHS3 compliant, while DG201BAK and DG201AAK/883B are RoHS non-compliant. For new designs or systems subject to environmental regulations, RoHS3 compliance is advantageous. Existing systems using non-compliant parts may continue operation without regulatory impact.

Q: Can DG201AAK/883B be used if DG444DJ+ is unavailable?

A: Yes, DG201AAK/883B is a functional substitute that maintains the full operating temperature range and dual supply voltage support of the DG201BAK. The trade-off is higher on-state resistance (175Ohm) and increased charge injection (20pC), which must be evaluated against circuit performance requirements.

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