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AP1538SG-13 Equivalent & Substitute Parts
Part Overview
The AP1538SG-13 is a buck switching regulator IC from Diodes Incorporated designed for positive adjustable step-down voltage regulation. It delivers 3A output current with an adjustable output range from 0.8V to 18V, suitable for applications requiring compact power management in surface mount form factor.
The AP1538SG-13 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance of systems utilizing this component.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Category | Power Management (PMIC) |
| Function | Step-Down (Buck) |
| Output Configuration | Positive Adjustable |
| Number of Outputs | 1 |
| Input Voltage Range | 3.6V to 18V |
| Output Voltage Range | 0.8V to 18V |
| Output Current | 3A |
| Switching Frequency | 300kHz |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Operating Temperature | -20°C to 85°C (TA) |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the AP1538SG-13 is determined by the following critical parameters:
- Topology & Function: Buck switching regulator with positive adjustable output
- Output Current Rating: 3A minimum
- Package Compatibility: 8-SOIC form factor with equivalent pin pitch (0.154", 3.90mm Width)
- Output Voltage Adjustability: Adjustable output type supporting the required voltage range
- Compliance & Status: RoHS3 compliance and active product status for long-term availability
The LSP5523-R8A meets these substitution criteria as an active, pin-compatible alternative from the same manufacturer with enhanced specifications and improved availability.
Parameter Comparison
| Parameter | AP1538SG-13 | LSP5523-R8A |
|---|---|---|
| Manufacturer | Diodes Incorporated | Diodes Incorporated |
| Category | Power Management (PMIC) | Power Management (PMIC) |
| Function | Step-Down (Buck) | Step-Down (Buck) |
| Output Configuration | Positive Adjustable | Positive Adjustable |
| Number of Outputs | 1 | 1 |
| Input Voltage (Min) | 3.6V | 4.5V |
| Input Voltage (Max) | 18V | 27V |
| Output Voltage (Min) | 0.8V | 0.925V |
| Output Voltage (Max) | 18V | 21.6V |
| Output Current | 3A | 3A |
| Switching Frequency | 300kHz | 340kHz |
| Synchronous Rectifier | No | Yes |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) Exposed Pad |
| Operating Temperature | -20°C to 85°C (TA) | -20°C to 125°C (TJ) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active |
Engineering Selection Recommendations
The LSP5523-R8A is the qualified substitute for the AP1538SG-13 based on the following factors:
- Product Status: The LSP5523-R8A maintains active product status with 17,149 units in stock, ensuring long-term supply chain availability compared to the obsolete AP1538SG-13.
- Compliance: Both parts maintain ROHS3 compliance and identical regulatory certifications (REACH Unaffected, ECCN EAR99, HTSUS 8542.39.0001).
- Pin Compatibility: Both devices use the 8-SOIC package with identical pitch and width specifications, enabling direct PCB layout compatibility.
- Functional Equivalence: Both are buck regulators with positive adjustable output, 3A current rating, and single output configuration.
- Enhanced Specifications: The LSP5523-R8A provides extended input voltage range (4.5V to 27V vs. 3.6V to 18V), higher output voltage ceiling (21.6V vs. 18V), integrated synchronous rectification, and wider operating temperature range (-20°C to 125°C vs. -20°C to 85°C).
Frequently Asked Questions (FAQ)
Q: Can the LSP5523-R8A directly replace the AP1538SG-13 without PCB modifications?
A: Yes. Both devices use the 8-SOIC package with identical pin pitch (0.154", 3.90mm Width). The LSP5523-R8A includes an exposed pad variant, which is compatible with existing PCB layouts designed for the AP1538SG-13.
Q: What are the key differences between these parts?
A: The LSP5523-R8A offers extended input voltage range (up to 27V vs. 18V), higher output voltage capability (21.6V vs. 18V), integrated synchronous rectification for improved efficiency, higher switching frequency (340kHz vs. 300kHz), and wider operating temperature range (125°C vs. 85°C junction temperature).
Q: Are there any output voltage adjustability differences?
A: Both parts feature adjustable output configuration. The AP1538SG-13 supports 0.8V to 18V output range, while the LSP5523-R8A supports 0.925V to 21.6V. Applications requiring output voltages below 0.925V require design verification.
Q: Does the exposed pad on the LSP5523-R8A affect compatibility?
A: No. The exposed pad is a thermal enhancement feature that improves heat dissipation. Existing PCB layouts can accommodate this feature without modification, and the pad may be left unconnected if thermal performance is not a design constraint.
Q: What is the impact of the synchronous rectifier in the LSP5523-R8A?
A: The integrated synchronous rectifier reduces conduction losses and improves overall efficiency compared to the non-synchronous AP1538SG-13. This is a performance enhancement with no negative compatibility impact.
Q: Are both parts RoHS compliant?
A: Yes. Both the AP1538SG-13 and LSP5523-R8A are ROHS3 compliant with identical regulatory certifications.
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