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| PartNumber | BU4939FVE-TR | BU4939F-TR | BU4939FTR |
| Description | Supervisory Circuits IC CMOS VOLT DETECT | Supervisory Circuits IC CMOS VOLT DETECT | Processor Supervisors |
| Manufacturer | ROHM Semiconductor | ROHM Semiconductor | - |
| Product Category | Supervisory Circuits | Supervisory Circuits | - |
| RoHS | Y | Y | - |
| Type | Voltage Detectors | Voltage Detectors | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | VSOF-5 | SOP-4 | - |
| Threshold Voltage | 3.9 V | 3.9 V | - |
| Number of Inputs Monitored | 1 Input | 1 Input | - |
| Output Type | CMOS | CMOS | - |
| Manual Reset | No Manual Reset | No Manual Reset | - |
| Watchdog Timers | No Watchdog | No Watchdog | - |
| Battery Backup Switching | No Backup | No Backup | - |
| Reset Delay Time | No | No | - |
| Supply Voltage Max | 7 V | 7 V | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 125 C | + 125 C | - |
| Quiescent Current | 0.5 uA | 0.5 uA | - |
| Accuracy | 1 % | 1 % | - |
| Series | BU4939FVE | BU4939F | - |
| Packaging | Reel | Reel | - |
| Brand | ROHM Semiconductor | ROHM Semiconductor | - |
| Overvoltage Threshold | 3.939 V | 3.939 V | - |
| Undervoltage Threshold | 3.861 V | 3.861 V | - |
| Chip Enable Signals | No Chip Enable | No Chip Enable | - |
| Development Kit | - | - | - |
| Operating Supply Current | 550 nA | 550 nA | - |
| Pd Power Dissipation | 210 mW | 400 mW | - |
| Power Fail Detection | No | No | - |
| Product Type | Supervisory Circuits | Supervisory Circuits | - |
| Factory Pack Quantity | 3000 | 3000 | - |
| Subcategory | PMIC - Power Management ICs | PMIC - Power Management ICs | - |
| Supply Voltage Min | 0.7 V | 0.7 V | - |
| Part # Aliases | BU4939FVE | BU4939F | - |