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PN3640 from National,National Semiconductor

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PN3640

Manufacturer: National, FSC, Fairchild

PNP SILICON TRANSISTOR

Partnumber Manufacturer Quantity Availability
PN3640 National, FSC, Fairchild 3696 In Stock

Description and Introduction

PNP SILICON TRANSISTOR The **PN3640** is a widely used **PNP bipolar junction transistor (BJT)** designed for general-purpose amplification and switching applications. Known for its reliability and efficiency, this component is commonly employed in low-power circuits, signal processing, and driver stages in electronic devices.  

With a **collector-emitter voltage (VCE)** rating of **-40V** and a **collector current (IC)** of **-600mA**, the PN3640 is suitable for moderate power handling. Its **DC current gain (hFE)** typically ranges between **100 and 300**, ensuring stable performance in amplification tasks. The transistor operates effectively within a **temperature range of -55°C to +150°C**, making it adaptable to various environmental conditions.  

The **TO-92 package** ensures easy integration into circuit boards, while its compact size makes it ideal for space-constrained designs. Engineers and hobbyists often favor the PN3640 for its consistent performance in audio amplifiers, voltage regulators, and switching circuits.  

When designing with the PN3640, proper biasing and heat dissipation should be considered to maximize efficiency and longevity. Its straightforward pin configuration—**Emitter (E), Base (B), Collector (C)**—simplifies circuit implementation.  

Overall, the PN3640 remains a dependable choice for low-to-medium power electronic applications, balancing performance, cost, and versatility.

Application Scenarios & Design Considerations

PNP SILICON TRANSISTOR

Alternative Part Number

  • 2N3904 --: General-purpose NPN small-signal transistor in a TO-92 package, widely available and commonly used as a functional substitute for PN3640 in low-power switching and amplification.
  • BC547 --: Low-noise NPN transistor with similar small-signal characteristics and TO-92 package, suitable for general amplification and switching replacement.
  • MMBT3904 --: SMD version of the 2N3904 with comparable electrical ratings, useful when a surface-mount alternative to the through-hole PN3640 is acceptable.
  • 2N3904 --: Widely available NPN general-purpose transistor with similar small-signal switching characteristics and pinout, easy drop-in for most PN3640 applications.
  • BC547 --: Low-noise NPN transistor with comparable current gain and voltage ratings, suitable for general amplification and switching where PN3640 is used.
  • MMBT3904 --: SMD version of the 2N3904 with equivalent electrical performance, useful when a surface-mount replacement is acceptable.
  • 2N3904 --: Widely available NPN general-purpose transistor with similar small-signal switching characteristics and pinout, easy drop-in for most PN3640 applications.
  • BC547 --: Common NPN small-signal transistor with comparable current gain and voltage ratings, suitable for general amplification and switching circuits.
  • MMBT3904 --: SMD version of the 2N3904 with equivalent electrical performance, useful when a surface-mount replacement is acceptable.

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