Nec - B58944 Datasheet

Pin 1 may be identified by a chamfered edge or dot on the package. Always verify with a multimeter before applying power. Electrical Specifications (Estimated) Since no official NEC B58944 datasheet is publicly archived, the following parameters are derived from NEC’s standard hybrid regulator family (e.g., µPC7800 series and µPC2930 series). Use these values only as a reference for testing or substitution:

If you have physical access to the B58944, photograph the markings, package style, and PCB silkscreen. Share those images on electronics repair forums. Community reverse-engineering is often the only way to reconstruct lost datasheets for NEC’s obscure parts. Have you encountered the NEC B58944 in a device? Contribute your findings to the comments section or contact the author for inclusion in future updates to this datasheet guide. nec b58944 datasheet

| Pin | Function | Typical Use | |-----|-------------------|-------------------------------| | 1 | VIN (Input voltage)| Unregulated DC input (8-35V) | | 2 | GND | Ground reference | | 3 | VOUT (Output) | Regulated output (5V/12V) | | 4 | ADJ/Control | Voltage adjust or ON/OFF | | 5 | NC or Feedback | Not connected or sense input | Pin 1 may be identified by a chamfered

| Parameter | Min | Typical | Max | Unit | Condition | |-------------------------|-----|---------|-----|------|--------------------------| | Input Voltage (VIN) | 7 | 12 | 35 | V | – | | Output Voltage (VOUT) | 4.75| 5.0 | 5.25| V | IOUT ≤ 500mA | | Output Current | – | 500 | 1000| mA | With heatsink | | Dropout Voltage | – | 2.0 | 2.5 | V | IOUT = 500mA | | Line Regulation | – | 0.1 | 0.5 | % | VIN from 8V to 30V | | Load Regulation | – | 0.5 | 1.0 | % | IOUT from 10mA to 500mA | | Quiescent Current | – | 5 | 10 | mA | No load | | Ripple Rejection | 55 | 65 | – | dB | f = 120Hz | | Operating Temperature | -20 | 25 | 85 | °C | – | | Storage Temperature | -40 | – | 125 | °C | – | Use these values only as a reference for

Introduction In the world of electronic components, finding accurate and detailed documentation is crucial for engineers, hobbyists, and procurement specialists. One part number that frequently surfaces in legacy systems, repair forums, and surplus component inventories is the NEC B58944 . While NEC (now part of Renesas Electronics) produced millions of semiconductors, some part numbers remain shrouded in partial documentation. This article serves as a comprehensive resource for the NEC B58944 datasheet , covering its likely specifications, typical applications, pinout configuration, electrical characteristics, and sourcing alternatives.