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DG445BDJ Equivalent & Substitute Parts
Part Overview
The DG445BDJ is a 4-circuit SPST-NO analog switch IC manufactured by Vishay Siliconix, housed in a 16-DIP package. This component features 80Ohm on-state resistance and operates across single supply (13V ~ 36V) or dual supply (±7V ~ 22V) configurations. The DG445BDJ is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | DG445BDJ |
| Manufacturer | Vishay Siliconix |
| Category | Interface |
| Description | IC SWITCH SPST-NOX4 80OHM 16DIP |
| Switch Circuit | SPST - NO |
| Number of Circuits | 4 |
| Multiplexer/Demultiplexer Circuit | 1:1 |
| On-State Resistance (Max) | 80Ohm |
| Voltage - Supply, Single (V+) | 13V ~ 36V |
| Voltage - Supply, Dual (V±) | ±7V ~ 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-DIP (0.300", 7.62mm) |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution for the DG445BDJ is determined by the following critical parameters:
- Switch topology: SPST-NO configuration with 4 circuits (1:1 multiplexer/demultiplexer)
- Package compatibility: 16-DIP (0.300", 7.62mm) through-hole mounting
- On-state resistance: Maximum 80Ohm (primary electrical constraint)
- Supply voltage ranges: Single supply 13V ~ 36V or dual supply ±7V ~ 22V
- Operating temperature: -40°C ~ 85°C capability
- Leakage current: Maximum 500pA
Substitute parts are grouped into two categories:
Direct Parametric Equivalents maintain identical electrical specifications and are pin-compatible replacements.
Functional Alternatives provide equivalent switching performance with modified electrical characteristics (lower on-state resistance, different supply voltage ranges, or altered timing parameters) but maintain the same package and circuit topology.
Parameter Comparison
| Parameter | DG445BDJ | DG445BDJ-E3 | DG445CJ+ | DG445DJ+ | MAX4602CPE+ | MAX4678EPE+ |
|---|---|---|---|---|---|---|
| Manufacturer | Vishay Siliconix | Vishay Siliconix | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated |
| Product Status | Obsolete | Active | Active | Active | Active | Active |
| Switch Circuit | SPST - NO | SPST - NO | SPST - NO | SPST - NO | SPST - NO | SPST - NO |
| Number of Circuits | 4 | 4 | 4 | 4 | 4 | 4 |
| On-State Resistance (Max) | 80Ohm | 80Ohm | 85Ohm | 85Ohm | 2.5Ohm | 1.6Ohm |
| Voltage - Supply, Single (V+) | 13V ~ 36V | 13V ~ 36V | 10V ~ 30V | 10V ~ 30V | 4.5V ~ 36V | 2.7V ~ 11V |
| Voltage - Supply, Dual (V±) | ±7V ~ 22V | ±7V ~ 22V | ±4.5V ~ 20V | ±4.5V ~ 20V | ±4.5V ~ 20V | ±2.7V ~ 5.5V |
| Switch Time (Ton, Toff) (Max) | 300ns, 200ns | 300ns, 200ns | 250ns, 170ns | 250ns, 170ns | 250ns, 350ns | 350ns, 150ns |
| Charge Injection | 1pC | 1pC | 5pC | 5pC | 120pC | 85pC |
| Channel Capacitance (CS(off), CD(off)) | 5pF, 5pF | 5pF, 5pF | 4pF, 4pF | 4pF, 4pF | 55pF, 55pF | 85pF, 85pF |
| Current - Leakage (IS(off)) (Max) | 500pA | 500pA | 500pA | 500pA | 500pA | 1nA |
| Crosstalk | -95dB @ 100kHz | -95dB @ 100kHz | -100dB @ 1MHz | -100dB @ 1MHz | -59dB @ 1MHz | -84dB @ 1MHz |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | 0°C ~ 70°C (TA) | -40°C ~ 85°C (TA) | 0°C ~ 70°C (TA) | -40°C ~ 85°C (TA) |
| Package / Case | 16-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
DG445BDJ-E3 is the direct parametric equivalent with identical electrical specifications. This part is recommended as the primary replacement for the obsolete DG445BDJ. The DG445BDJ-E3 maintains 80Ohm on-state resistance, identical supply voltage ranges, and equivalent switching characteristics. This part carries ROHS3 compliance, addressing regulatory requirements for new designs.
DG445CJ+ and DG445DJ+ are functionally compatible alternatives from Analog Devices Inc./Maxim Integrated. Both parts feature 85Ohm on-state resistance (5Ohm higher than the original), improved crosstalk performance (-100dB @ 1MHz), and faster switching times (250ns, 170ns). The DG445DJ+ supports the full -40°C ~ 85°C operating temperature range, matching the original part's thermal specification. The DG445CJ+ operates within 0°C ~ 70°C, which may limit applicability in extended temperature environments.
MAX4602CPE+ provides significantly lower on-state resistance (2.5Ohm) with extended single supply voltage range (4.5V ~ 36V). This part introduces higher charge injection (120pC) and channel capacitance (55pF), which may affect signal integrity in sensitive analog applications. Operating temperature is limited to 0°C ~ 70°C.
MAX4678EPE+ offers the lowest on-state resistance (1.6Ohm) with the widest supply voltage flexibility (2.7V ~ 11V single supply). This part operates at -40°C ~ 85°C and includes a 66MHz -3dB bandwidth specification. The significantly higher channel capacitance (85pF) and charge injection (85pC) make this part suitable only for applications where lower on-state resistance is critical and signal bandwidth requirements are not stringent.
All substitute parts maintain 16-DIP package compatibility and ROHS3 compliance status, supporting modern manufacturing and environmental standards.
Frequently Asked Questions (FAQ)
Q: Can DG445BDJ-E3 be used as a direct replacement for DG445BDJ?
A: Yes. The DG445BDJ-E3 is a direct parametric equivalent with identical on-state resistance (80Ohm), supply voltage ranges, switching times, and operating temperature specifications. Pin compatibility and circuit topology are maintained. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant).
Q: What are the key differences between DG445BDJ and DG445DJ+?
A: The DG445DJ+ features 85Ohm on-state resistance (5Ohm higher), faster switching times (250ns/170ns vs. 300ns/200ns), and improved crosstalk performance (-100dB @ 1MHz vs. -95dB @ 100kHz). Supply voltage ranges are narrower (10V ~ 30V single supply vs. 13V ~ 36V). Both parts support -40°C ~ 85°C operating temperature. The DG445DJ+ is manufactured by Analog Devices Inc./Maxim Integrated and carries ROHS3 compliance.
Q: When should MAX4602CPE+ or MAX4678EPE+ be considered?
A: These parts are functional alternatives when lower on-state resistance is a design requirement. MAX4602CPE+ (2.5Ohm) and MAX4678EPE+ (1.6Ohm) reduce power dissipation in switching applications. However, both introduce significantly higher channel capacitance and charge injection, which degrade signal integrity in analog signal routing applications. Operating temperature for MAX4602CPE+ is limited to 0°C ~ 70°C. These parts are suitable for digital switching or power distribution applications where analog signal fidelity is not critical.
Q: Are all substitute parts pin-compatible with DG445BDJ?
A: Yes. All listed substitute parts use the 16-DIP (0.300", 7.62mm) package with identical pinout. Direct board-level substitution is possible without PCB redesign.
Q: What is the impact of higher on-state resistance in DG445CJ+ and DG445DJ+?
A: The 5Ohm increase (80Ohm to 85Ohm) results in proportionally higher voltage drop across the switch at given signal currents. In analog signal routing, this may introduce measurable signal attenuation. In digital switching applications, the impact is negligible. Thermal dissipation increases proportionally with resistance and current: P = I² × R.
Q: Why do MAX4602CPE+ and MAX4678EPE+ have higher charge injection and capacitance?
A: These parts are optimized for lower on-state resistance, which typically requires larger transistor geometries and increased parasitic capacitance. Higher charge injection is a consequence of larger switching transistors. These characteristics make these parts unsuitable for precision analog multiplexing but acceptable for digital switching or high-current applications where on-state resistance is the dominant design constraint.
Q: What is the significance of RoHS compliance for substitute selection?
A: RoHS3 compliance is mandatory for products sold into regulated markets (EU, China, and others). The original DG445BDJ is RoHS non-compliant. All active substitute parts (DG445BDJ-E3, DG445CJ+, DG445DJ+, MAX4602CPE+, MAX4678EPE+) carry ROHS3 compliance, meeting current environmental and regulatory requirements for new designs and production.
Q: Can DG445CJ+ be used in applications requiring -40°C ~ 85°C operation?
A: No. DG445CJ+ operates within 0°C ~ 70°C. For extended temperature range applications, use DG445BDJ-E3, DG445DJ+, or MAX4678EPE+, all of which support -40°C ~ 85°C operation.
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