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DG528BK Equivalent & Substitute Parts
Part Overview
The DG528BK is an 8:1 analog multiplexer IC manufactured by Vishay Siliconix, designed for signal routing and switching applications in analog circuits. This component features a single 8:1 multiplexer circuit with 450Ohm on-state resistance and operates on dual supply voltages (±15V). The DG528BK is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system support and new design implementations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Multiplexer Configuration | 8:1 |
| Number of Circuits | 1 |
| On-State Resistance (Max) | 450Ohm |
| Channel-to-Channel Matching (ΔRon) | 27Ohm |
| Voltage - Supply, Dual (V±) | ±15V |
| Channel Capacitance (CS(off), CD(off)) | 5pF, 25pF |
| Current - Leakage (IS(off)) (Max) | 5nA |
| Charge Injection | 4pC |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 18-CDIP (0.300", 7.62mm) |
| Mounting Type | Through Hole |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the DG528BK is determined by the following critical parameters:
- Multiplexer Configuration: Must be 8:1 to maintain functional equivalence
- Number of Circuits: Must be 1 circuit
- On-State Resistance: Must be 450Ohm maximum to preserve signal integrity
- Channel-to-Channel Matching (ΔRon): Must be 27Ohm or better for consistent channel performance
- Channel Capacitance: Must match 5pF and 25pF specifications
- Operating Temperature Range: Must support -40°C ~ 85°C minimum
- Supply Voltage Compatibility: Substitute must operate within the system's dual supply voltage range
The DG508ADJ+ from Analog Devices Inc./Maxim Integrated qualifies as a substitute based on matching multiplexer configuration (8:1), circuit count (1), on-state resistance (450Ohm), channel matching (27Ohm), channel capacitance (5pF, 25pF), and operating temperature range (-40°C ~ 85°C). The substitute operates on a wider dual supply voltage range (±4.5V ~ 18V), which encompasses the DG528BK's ±15V requirement.
Parameter Comparison
| Parameter | DG528BK (Main Part) | DG508ADJ+ (Substitute) |
|---|---|---|
| Manufacturer | Vishay Siliconix | Analog Devices Inc./Maxim Integrated |
| Multiplexer Configuration | 8:1 | 8:1 |
| Number of Circuits | 1 | 1 |
| On-State Resistance (Max) | 450Ohm | 450Ohm |
| Channel-to-Channel Matching (ΔRon) | 27Ohm | 27Ohm |
| Voltage - Supply, Dual (V±) | ±15V | ±4.5V ~ 18V |
| Channel Capacitance (CS(off), CD(off)) | 5pF, 25pF | 5pF, 25pF |
| Current - Leakage (IS(off)) (Max) | 5nA | 1nA |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Switch Time (Ton, Toff) (Max) | Not specified | 1.5µs, 1µs |
| Package / Case | 18-CDIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) |
| Product Status | Obsolete | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
Engineering Selection Recommendations
The DG508ADJ+ is the qualified substitute for the obsolete DG528BK based on functional parameter equivalence. Key considerations for selection:
Product Status: The DG528BK is obsolete, while the DG508ADJ+ maintains active production status, ensuring long-term availability and supply chain reliability.
Compliance: The DG508ADJ+ is ROHS3 compliant, whereas the DG528BK is non-compliant. Systems requiring RoHS compliance must use the DG508ADJ+ substitute.
Electrical Performance: Both parts maintain identical on-state resistance (450Ohm), channel matching (27Ohm), and channel capacitance specifications. The DG508ADJ+ provides superior leakage current performance (1nA vs. 5nA), reducing power consumption in low-signal applications.
Supply Voltage: The DG508ADJ+ operates across ±4.5V ~ 18V, providing greater flexibility than the DG528BK's fixed ±15V specification. Systems operating at ±15V are fully supported.
Package Consideration: The DG528BK uses an 18-CDIP package, while the DG508ADJ+ uses a 16-DIP package. PCB layout modifications are required for substitution.
Frequently Asked Questions (FAQ)
Q: Can the DG508ADJ+ directly replace the DG528BK without circuit modifications?
A: The DG508ADJ+ is electrically equivalent for multiplexer function, on-state resistance, and channel matching. However, the package differs (16-DIP vs. 18-CDIP), requiring PCB layout changes. Pin configuration must be verified against both datasheets before implementation.
Q: What is the significance of the lower leakage current in the DG508ADJ+?
A: The DG508ADJ+ exhibits 1nA maximum leakage current compared to the DG528BK's 5nA. This improvement reduces off-channel signal feedthrough and power consumption, particularly beneficial in precision analog signal routing applications.
Q: Does the DG508ADJ+ support the same ±15V supply voltage as the DG528BK?
A: Yes. The DG508ADJ+ operates across ±4.5V ~ 18V, which encompasses the DG528BK's ±15V specification. Systems designed for ±15V operation are fully compatible.
Q: Are there any RoHS compliance implications when substituting the DG528BK?
A: The DG528BK is RoHS non-compliant, while the DG508ADJ+ is ROHS3 compliant. New designs or systems requiring RoHS compliance must use the DG508ADJ+ substitute.
Q: What are the pin count differences between these parts?
A: The DG528BK is packaged in 18-CDIP with 18 pins, while the DG508ADJ+ uses 16-DIP with 16 pins. Pin mapping differences require careful verification during circuit redesign.
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