Genuine Motorola NPN Digital Transistor with Integrated 47K Bias Resistors - 5-Pack
The Motorola 4880048M01 is a high-performance NPN digital transistor with integrated 47K/47K bias resistors, designed for professional repair and maintenance of Motorola radio equipment. This genuine OEM component simplifies circuit design by incorporating base and emitter resistors directly into the transistor package, reducing component count and board space requirements. Sold as a convenient 5-pack for multiple repairs or inventory stocking.
Key Features
- Genuine Motorola factory replacement parts - ensures reliable performance across multiple repairs
- NPN digital transistor with integrated bias resistor network
- 47K ohm base resistor (R1) for simplified biasing
- 47K ohm base-emitter resistor (R2) for improved noise immunity
- SOT-23 three-terminal surface-mount package
- Reduces external component count and board space
- Ideal for digital signal processing and switching applications
- 5-pack quantity for multiple repairs or inventory management
Compatible Models
- Various Motorola commercial and professional two-way radio models
- Used in digital circuits, signal processing, switching, and interface applications
- Consult your radio's service manual or schematic diagram for exact component location
What's Included
- Five (5) Motorola NPN digital transistors with 47K/47K integrated resistors
Application and Installation
Professional Installation Required: These surface-mount digital transistors require specialized soldering equipment and proper technique for installation. SMD transistor replacement demands precision tools including a temperature-controlled soldering station with fine tips, magnification equipment, ESD-safe work environment, and careful attention to component orientation. This repair should only be performed by qualified electronics technicians or certified Motorola service centers with experience in surface-mount technology.
Digital transistors, also known as bias resistor transistors or resistor-equipped transistors, integrate the biasing network directly into the component package. The internal 47K base resistor (R1) limits input current and provides proper biasing, while the 47K base-emitter resistor (R2) improves noise immunity and prevents false triggering from stray signals. This configuration is particularly useful in digital interface circuits, microcontroller I/O driving, signal level shifting, and noise-sensitive switching applications.
Understanding Digital Transistor Configuration: In a standard discrete transistor circuit, external base and base-emitter resistors would be required. Digital transistors eliminate these external components by integrating them internally. The 47K/47K configuration (R1=47K, R2=47K) provides balanced biasing suitable for medium-impedance digital signals and microcontroller interfaces operating at typical logic levels.
Critical Installation Notes: Always observe proper ESD protection when handling digital transistors, as they are sensitive to static discharge. Verify correct component orientation by checking the PCB silkscreen markings and comparing with the original component. The three-terminal SOT-23 package has specific base, collector, and emitter pin assignments that must be properly oriented during installation.
Apply solder quickly to avoid overheating the transistor. Use flux to ensure good solder joints on the small SMD pads. After installation, clean any flux residue and verify proper circuit operation by measuring voltages at the base, collector, and emitter terminals. Test the switching or amplification function to confirm proper operation.
When to Replace
Digital transistors can fail due to overvoltage, excessive current, ESD damage, or thermal stress. Symptoms of transistor failure include no switching action, stuck-on or stuck-off conditions, weak output signal, or complete circuit malfunction. When replacing a failed digital transistor, investigate the cause of failure. Check associated components, power supply voltages, and signal levels to prevent repeated failures.
Technical Specifications
- Type: NPN Digital Transistor (Bias Resistor Transistor)
- Base Resistor (R1): 47K ohm
- Base-Emitter Resistor (R2): 47K ohm
- Package: SOT-23 (3-terminal) surface-mount
- Configuration: NPN with integrated bias network
- Application: Digital switching, signal processing, interface circuits
- Device Marking: 2GN (visible on component)
Part Numbers
- Motorola Part Number: 4880048M01
- Component Designation: NPN Digital Transistor 47K/47K
- Package Type: SOT-23 Surface-Mount
- Quantity: 5-pack
