TO-92

Q:What defines the physical structure of TO-92?

A:Key features include:
- Through-hole mounting: Three axial leads for easy PCB insertion.
- Compact epoxy body: Cylindrical shape with a tapered end.
- 3-pin layout: Linear pin arrangement (standard: 2.54 mm spacing).
- Lightweight design: Typical weight < 0.5 g.

Q:Why choose TO-92 over alternatives?

A:Critical advantages:
- Cost-effective: ~30% cheaper than SMD equivalents (e.g., SOT-23).
- Hands-on prototyping: Simplified manual soldering for lab testing.
- Thermal tolerance: Epoxy body withstands up to 150°C.
- Legacy compatibility: Widely used in through-hole designs.

Q:What are common technical specs?

A:Standard configurations (consult datasheets):
- Body Size: 4.6 × 4.0 mm (typical).
- Height: 5.3 mm (including leads).
- Pin Pitch: 2.54 mm (0.1 inch).
- Material: Epoxy resin body, tin-plated copper leads.
- Temp Range: -55°C to +150°C.

Q:Where is TO-92 typically applied?

A:Dominant use cases:
- Discrete semiconductors: Transistors (e.g., 2N3904), voltage regulators.
- Low-power sensors: Temperature sensors (e.g., LM35).
- Hobbyist electronics: Breadboard-friendly prototyping.

Q:What are critical assembly guidelines?

A:Key recommendations:
- PCB Design: 1.0 mm minimum hole diameter for leads.
- Soldering: Manual or wave soldering (260°C max, 5 sec exposure).
- Lead bending: Avoid stress within 3 mm of the epoxy body.
- Inspection: Visual check for lead alignment and resin cracks.