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| PartNumber | S-8521B40MC-ATZT2U | S-8521B44MC-AUDT2G | S-8521B40MC-ATZT2G |
| Description | Switching Controllers Step Down SWR PWM/ PFM 180kHz 60uA Iq | Switching Controllers Step Down SWR PWM/ PFM 180kHz 60uA Iq | Switching Controllers Step Down SWR PWM/ PFM 180kHz 60uA Iq |
| Manufacturer | ABLIC | SII Semiconductor USA Corporation | SII Semiconductor USA Corporation |
| Product Category | Switching Controllers | PMIC - Voltage Regulators - DC DC Switching Controllers | PMIC - Voltage Regulators - DC DC Switching Controllers |
| RoHS | Y | - | - |
| Number of Outputs | 1 Output | 1 | 1 |
| Input Voltage | 2.5 V to 16 V | - | - |
| Output Voltage | 4 V | - | - |
| Minimum Operating Temperature | - 40 C | - | - |
| Maximum Operating Temperature | + 85 C | - | - |
| Mounting Style | SMD/SMT | - | - |
| Package / Case | SOT-23-5 | - | - |
| Packaging | Reel | Tape & Reel (TR) | Tape & Reel (TR) |
| Brand | ABLIC | - | - |
| Product Type | Switching Controllers | - | - |
| Factory Pack Quantity | 3000 | - | - |
| Subcategory | PMIC - Power Management ICs | - | - |
| Unit Weight | 0.000282 oz | - | - |
| Series | - | - | - |
| Package Case | - | SC-74A, SOT-753 | SC-74A, SOT-753 |
| Operating Temperature | - | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Output Type | - | Transistor Driver | Transistor Driver |
| Function | - | Step-Down | Step-Down |
| Supplier Device Package | - | SOT-23-5 | SOT-23-5 |
| Topology | - | Buck | Buck |
| Voltage Supply Vcc Vdd | - | 2.5 V ~ 16 V | 2.5 V ~ 16 V |
| Frequency Switching | - | 180kHz | 180kHz |
| Control Features | - | Enable | Enable |
| Output Configuration | - | Positive | Positive |
| Output Phases | - | 1 | 1 |
| Duty Cycle Max | - | 1 | 1 |
| Synchronous Rectifier | - | No | No |
| Clock Sync | - | No | No |
| Serial Interfaces | - | - | - |