1. General Information & Identification

️· Part Number: LMBT5087
️· Manufacturer: Leshan Radio Company, Ltd. (LES)
️· Package: SOT-23 (Surface Mount Technology)

2. Electrical Characteristics (Highlights – a comprehensive list would be very long; see datasheet for full details)

️· Type: NPN Bipolar Junction Transistor (BJT)
️· Static Characteristics (These define the transistor’s behavior at DC):
- Collector saturation region, current gain, and reverse voltage are described in the data.
- Collector-Emitter voltage saturation region is given.
️· Dynamic Characteristics (These describe the transistor's behavior under changing conditions):
- Current Gain-Bandwidth Product (hFE * fT)
- Switching Times (Turn-on and Turn-off) are detailed.
- Capacitance is listed.

3. Thermal Characteristics & Design Considerations

️· Thermal Response Data: The datasheet includes a design note explaining how to use thermal response data to calculate the peak junction temperature during pulsed operation.
- The formula is: `ΔT = r(t) x P (pk) x R θJA`
■ `ΔT`: Peak rise in junction temperature (°C)
■ `r(t)`: Reading from Figure 8 in the datasheet (Thermal Response).
■ `P (pk)`: Peak power dissipation (Watts)
■ `R θJA`: Thermal resistance from junction to ambient (This is a fixed value provided by the manufacturer. Refer to the datasheet.)
️· Reference: AN-569 (likely an application note from the manufacturer for more detailed information).

4. Mechanical Dimensions (SOT-23 Package)

️· The datasheet provides a table of dimensions for the SOT-23 package, in both inches and millimeters. These dimensions are crucial for PCB layout and ensuring proper fit.
️· Dimensions are given for dimensions A, B, C, D, G, H, J, K, L, S, V.

5. Key Figures and Graphs (Refer to the datasheet for visual data):

️· Figure 2: Collector Characteristics (shows the typical collector current vs. collector-emitter voltage for various base currents).
️· Figure 10: Turn-On Time (shows the turn-on time vs. collector current)
️· Figure 11: Turn-Off Time (shows the turn-off time vs. collector current)
️· Figure 14: Thermal Response (important for pulsed operation calculations)
️· Figure 2: Collector Leakage Current (Temperature vs. Current)

Overall Purpose & Use Case:

This LMBT5087 is a general-purpose NPN transistor suitable for a wide range of applications where a small, surface-mount NPN transistor is needed. The datasheet provides all the necessary information for designers to properly incorporate this transistor into their circuit designs, paying particular attention to thermal management if the transistor will be operating with pulsed power.