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CS5124XD8 Equivalent & Substitute Parts
Part Overview
The CS5124XD8 is a flyback and forward converter regulator controller IC manufactured by onsemi, designed for step-up/step-down DC-DC conversion applications with positive, isolation-capable output configuration. This device operates as a transistor driver with soft start control features and is housed in an 8-SOIC surface mount package.
The CS5124XD8 is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance of systems utilizing this controller IC.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Part Number | CS5124XD8 |
| Category | Power Management (PMIC) |
| Topology | Flyback, Forward Converter |
| Function | Step-Up/Step-Down |
| Output Configuration | Positive, Isolation Capable |
| Output Type | Transistor Driver |
| Number of Outputs | 1 |
| Voltage Supply Range (Vcc/Vdd) | 7.7V ~ 20V |
| Switching Frequency | 400kHz |
| Duty Cycle (Max) | 82.5% |
| Control Features | Soft Start |
| Operating Temperature Range | -40°C ~ 105°C (TA) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the CS5124XD8 is determined by strict equivalence across the following critical parameters:
Topology and Function: The substitute must support flyback and forward converter topologies with step-up/step-down DC-DC conversion capability.
Output Configuration: The substitute must provide positive, isolation-capable output configuration with transistor driver output type.
Electrical Specifications: The substitute must match the supply voltage range (7.7V ~ 20V), switching frequency (400kHz), maximum duty cycle (82.5%), and operating temperature range (-40°C ~ 105°C).
Package and Mounting: The substitute must be housed in an 8-SOIC surface mount package with identical physical dimensions (0.154", 3.90mm Width).
Control Features: The substitute must include soft start control functionality.
Based on these criteria, the CS5124XD8 has one identified substitute part: CS5124XD8G.
Parameter Comparison
| Parameter | CS5124XD8 | CS5124XD8G |
|---|---|---|
| Manufacturer | onsemi | onsemi |
| Category | Power Management (PMIC) | Power Management (PMIC) |
| Topology | Flyback, Forward Converter | Flyback, Forward Converter |
| Function | Step-Up/Step-Down | Step-Up/Step-Down |
| Output Configuration | Positive, Isolation Capable | Positive, Isolation Capable |
| Output Type | Transistor Driver | Transistor Driver |
| Number of Outputs | 1 | 1 |
| Voltage Supply Range (Vcc/Vdd) | 7.7V ~ 20V | 7.7V ~ 20V |
| Switching Frequency | 400kHz | 400kHz |
| Duty Cycle (Max) | 82.5% | 82.5% |
| Control Features | Soft Start | Soft Start |
| Operating Temperature Range | -40°C ~ 105°C (TA) | -40°C ~ 105°C (TA) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount | Surface Mount |
| Product Status | Obsolete | Obsolete |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| Packaging | Not specified | Tube |
Engineering Selection Recommendations
The CS5124XD8G is a direct functional equivalent to the CS5124XD8, with identical electrical specifications, topology, and package configuration. The primary distinction is regulatory compliance: the CS5124XD8G is ROHS3 compliant, whereas the CS5124XD8 is RoHS non-compliant. For applications subject to RoHS regulations or environmental compliance requirements, the CS5124XD8G is the appropriate selection. Both parts are classified as obsolete; selection between them should be based on compliance requirements and packaging availability (tube packaging for CS5124XD8G).
Frequently Asked Questions (FAQ)
Q: Can the CS5124XD8G be used as a direct replacement for the CS5124XD8?
A: Yes. The CS5124XD8G is electrically and functionally equivalent to the CS5124XD8. Both parts share identical topology, output configuration, electrical specifications, and 8-SOIC package dimensions. The primary difference is RoHS compliance status.
Q: What is the significance of the RoHS compliance difference?
A: The CS5124XD8G is ROHS3 compliant, while the CS5124XD8 is RoHS non-compliant. For applications or markets requiring RoHS compliance, the CS5124XD8G must be selected. For legacy systems without compliance requirements, either part may be used based on availability.
Q: Are the package dimensions identical between these parts?
A: Yes. Both the CS5124XD8 and CS5124XD8G are housed in 8-SOIC packages with identical physical dimensions (0.154", 3.90mm Width). No PCB layout modifications are required for substitution.
Q: What is the difference between the packaging specifications listed?
A: The CS5124XD8G is supplied in tube packaging, while the CS5124XD8 packaging is not specified. This affects handling and storage but does not impact electrical or mechanical compatibility.
Q: Are there any other onsemi CS5124 variants available?
A: Based on the provided data, only the CS5124XD8 and CS5124XD8G are documented. Both are derived from the CS5124 base product number.
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