DG201BDK Equivalent & Substitute Parts

Part Overview

The DG201BDK is a 4-circuit SPST-NC analog switch manufactured by Vishay Siliconix, housed in a 16-CERDIP package. This component operates as a 1:1 multiplexer/demultiplexer with an on-state resistance of 85Ohm and supports dual supply voltages (±4.5V to ±22V). The DG201BDK is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

DG201BDK

Vishay SiliconixIn Stock: 943DG201BDK Datasheet

Current PartRFQ

ADG221KNZ

Analog Devices Inc.In Stock: 1247ADG221KNZ Datasheet

MFR RecommendedRFQ

DG201AAK

Vishay SiliconixIn Stock: 3318DG201AAK Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DG201BDK is determined by the following critical parameters:

• Switch topology: SPST-NC configuration with 4 independent circuits
• Circuit count and multiplexing ratio: 4 circuits in 1:1 configuration
• On-state resistance: Maximum 85Ohm with channel matching tolerance of 2Ohm
• Supply voltage compatibility: Dual supply operation (±4.5V to ±22V)
• Switching performance: Ton/Toff specifications of 300ns/200ns maximum
• Leakage and crosstalk: IS(off) ≤ 500pA and crosstalk ≤ -95dB @ 100kHz
• Package form factor: 16-pin DIP configuration with through-hole mounting

The identified substitutes maintain functional equivalence within the allowed parameter ranges for this product category. Variations in on-state resistance, leakage current, and switching times are within acceptable tolerances for analog switch applications.

Parameter Comparison

Engineering Selection Recommendations

ADG221KNZ is the preferred substitute for new designs and ongoing production. This part is manufactured by Analog Devices Inc. and maintains active product status, ensuring long-term availability and supply chain stability. The ADG221KNZ is ROHS3 compliant, meeting current environmental and regulatory requirements. While on-state resistance is slightly higher (90Ohm vs. 85Ohm) and switching times are marginally longer, these variations remain within acceptable tolerances for most analog switch applications. The 16-DIP package is mechanically compatible with the original 16-CDIP footprint for through-hole mounting.

DG201AAK is an alternative substitute from the same manufacturer (Vishay Siliconix) and shares the 16-CERDIP package form factor with the DG201BDK. However, this part exhibits higher on-state resistance (175Ohm) and longer switching times (600ns/450ns), making it suitable only for applications where these parameter variations are acceptable. The DG201AAK offers an extended operating temperature range (-55°C to 125°C) and improved crosstalk performance (-90dB), which may be advantageous in specific thermal or signal integrity requirements. This part remains obsolete.

For applications requiring strict adherence to the original DG201BDK specifications, particularly regarding on-state resistance and switching speed, the ADG221KNZ provides the closest functional match with the added benefit of active product status and modern compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the ADG221KNZ directly replace the DG201BDK in existing PCB designs?

A: Yes. Both parts use 16-pin DIP through-hole packages with 0.300" (7.62mm) spacing. Pin-to-pin compatibility must be verified against the specific application schematic, as the ADG221KNZ is manufactured by a different vendor. The mechanical footprint is compatible for board-level substitution.

Q: What are the key differences between ADG221KNZ and DG201AAK as substitutes?

A: The ADG221KNZ has lower on-state resistance (90Ohm vs. 175Ohm), faster switching times (350ns/250ns vs. 600ns/450ns), and active product status. The DG201AAK offers extended temperature range (-55°C to 125°C vs. -40°C to 85°C) and better crosstalk performance (-90dB vs. -80dB). Selection depends on whether speed or temperature range is the priority.

Q: Is the DG201BDK still available for purchase?

A: The DG201BDK is classified as obsolete. Current inventory may exist through authorized distributors, but long-term availability is not guaranteed. Transition to an active substitute such as the ADG221KNZ is recommended for new designs and production planning.

Q: What is the impact of the higher on-state resistance in the DG201AAK?

A: The DG201AAK exhibits 175Ohm on-state resistance compared to the DG201BDK's 85Ohm. This doubles the resistive path and increases signal attenuation and power dissipation. Applications sensitive to signal loss or thermal performance should use the ADG221KNZ instead.

Q: Are there RoHS compliance considerations for substitution?

A: The DG201BDK is RoHS non-compliant. The ADG221KNZ is ROHS3 compliant, meeting current environmental directives. If RoHS compliance is a system requirement, the ADG221KNZ is the appropriate choice. The DG201AAK remains RoHS non-compliant.

Q: How do supply voltage ranges compare between these parts?

A: The DG201BDK supports dual supply from ±4.5V to ±22V. Both substitutes operate at fixed ±15V dual supply. Applications requiring the full ±4.5V to ±22V range must verify that ±15V operation is acceptable for the system design.