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S-8521F15MC-BPAT2G Equivalent & Substitute Parts
Part Overview
The S-8521F15MC-BPAT2G is a Buck Regulator Positive Output Step-Down DC-DC Controller IC manufactured by ABLIC Inc. in SOT-23-5 surface mount package. This part operates as a transistor driver with step-down topology, delivering a single output phase at 300kHz switching frequency with 100% maximum duty cycle. The device is classified as Not For New Designs, making identification of active equivalent alternatives essential for ongoing production and maintenance applications. Substitute parts must maintain identical electrical characteristics and mechanical compatibility while offering active product status where available.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | ABLIC Inc. |
| Category | Power Management (PMIC) |
| Function | Step-Down Buck Regulator Controller |
| Output Type | Transistor Driver |
| Topology | Buck |
| Number of Outputs | 1 |
| Output Phases | 1 |
| Voltage Supply Range (Vcc/Vdd) | 2.5V ~ 16V |
| Switching Frequency | 300kHz |
| Duty Cycle (Max) | 100% |
| Package / Case | SC-74A, SOT-753 |
| Supplier Device Package | SOT-23-5 |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| REACH Status | REACH Unaffected |
Substitute Part Grouping Explanation
Substitute parts for the S-8521F15MC-BPAT2G are qualified based on the following critical parameters that determine functional and mechanical compatibility:
Core Substitution Criteria:
- Output Type: Transistor Driver
- Function: Step-Down
- Output Configuration: Positive
- Topology: Buck
- Number of Outputs: 1
- Output Phases: 1
- Voltage Supply Range: 2.5V ~ 16V
- Duty Cycle (Max): 100%
- Package / Case: SC-74A, SOT-753
- Supplier Device Package: SOT-23-5
- Operating Temperature: -40°C ~ 85°C (TA)
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level: 1 (Unlimited)
- REACH Status: REACH Unaffected
Allowable Variation: Switching frequency may differ from the main part's 300kHz specification. The S-8520 series substitute parts operate at 180kHz, which is acceptable within the buck controller topology classification as this parameter does not affect the core step-down regulation function or physical compatibility.
All identified substitutes are manufactured by ABLIC Inc. and maintain identical electrical supply ranges, output configurations, and package specifications.
Parameter Comparison
| Parameter | S-8521F15MC-BPAT2G (Main) | S-8520B15MC-ARAT2U | S-8520B18MC-ARDT2U | S-8520B24MC-ARJT2U | S-8520B25MC-ARKT2U | S-8520B28MC-ARNT2U | S-8520B30MC-ARPT2U | S-8520B32MC-ARRT2U | S-8520B33MC-ARST2U | S-8520B34MC-ARTT2U | S-8520B35MC-ARUT2U |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | ABLIC Inc. | ABLIC Inc. | ABLIC Inc. | ABLIC Inc. | ABLIC Inc. | ABLIC Inc. | ABLIC Inc. | ABLIC Inc. | ABLIC Inc. | ABLIC Inc. | ABLIC Inc. |
| Function | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down |
| Output Type | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver |
| Output Configuration | Positive | Positive | Positive | Positive | Positive | Positive | Positive | Positive | Positive | Positive | Positive |
| Topology | Buck | Buck | Buck | Buck | Buck | Buck | Buck | Buck | Buck | Buck | Buck |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Output Phases | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage Supply (Vcc/Vdd) | 2.5V ~ 16V | 2.5V ~ 16V | 2.5V ~ 16V | 2.5V ~ 16V | 2.5V ~ 16V | 2.5V ~ 16V | 2.5V ~ 16V | 2.5V ~ 16V | 2.5V ~ 16V | 2.5V ~ 16V | 2.5V ~ 16V |
| Switching Frequency | 300kHz | 180kHz | 180kHz | 180kHz | 180kHz | 180kHz | 180kHz | 180kHz | 180kHz | 180kHz | 180kHz |
| Duty Cycle (Max) | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% |
| Package / Case | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 |
| Supplier Device Package | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| REACH Status | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected |
| Product Status | Not For New Designs | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
The S-8521F15MC-BPAT2G is designated as Not For New Designs, necessitating substitution for ongoing production requirements. All identified substitute parts from the S-8520 series maintain Active product status with ABLIC Inc., ensuring long-term availability and supply chain continuity.
All substitute parts carry identical ROHS3 compliance and REACH Unaffected certifications, meeting regulatory requirements for both current and future applications. The MSL rating of 1 (Unlimited) is consistent across all parts, indicating no moisture sensitivity constraints during storage or handling.
The primary electrical difference is the switching frequency: the main part operates at 300kHz while all S-8520 series substitutes operate at 180kHz. Both frequencies are within the buck controller topology classification and do not affect the core step-down regulation capability or physical compatibility.
Packaging options vary between Tape & Reel (TR) and Cut Tape (CT) formats. Selection should align with production assembly requirements and inventory management practices. The SOT-23-5 package specification remains constant across all parts, ensuring identical PCB footprint and soldering compatibility.
Frequently Asked Questions (FAQ)
Q: Can S-8520 series parts directly replace the S-8521F15MC-BPAT2G?
A: Yes. All S-8520 series parts listed maintain identical electrical specifications for supply voltage range, output configuration, topology, number of outputs, output phases, duty cycle, operating temperature, package type, and regulatory compliance. The switching frequency difference (180kHz vs. 300kHz) does not prevent functional substitution within buck controller applications.
Q: What is the significance of the switching frequency difference?
A: The main part operates at 300kHz while substitute parts operate at 180kHz. Both frequencies are valid for buck regulator controller operation. The frequency difference may affect output filter component selection and EMI characteristics in the final application circuit, but does not impact the core controller functionality or pin compatibility.
Q: Are packaging format differences between Tape & Reel and Cut Tape significant?
A: Packaging format affects supply chain logistics and assembly processes but not electrical or mechanical compatibility. Tape & Reel (TR) packaging is standard for high-volume automated assembly, while Cut Tape (CT) is suitable for lower-volume or manual assembly operations. Both formats contain identical SOT-23-5 components with identical PCB footprints.
Q: Why is the main part marked as Not For New Designs?
A: This designation indicates the part is in end-of-life status. ABLIC Inc. recommends using active alternatives for new product development. All listed S-8520 series substitutes carry Active product status, providing assured long-term availability and manufacturing support.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts maintain ROHS3 compliance and REACH Unaffected status, identical to the main part. This ensures regulatory compliance for applications in regions with RoHS and REACH requirements.
Q: What inventory levels are available for substitute parts?
A: Inventory varies by part number and packaging format. S-8520B30MC-ARPT2U offers the highest inventory at 1237 pieces. Specific availability should be confirmed with the component supplier for production planning purposes.
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