BC559

Single Bipolar Transistors Overview

The onsemi BC559 is a PNP general-purpose bipolar junction transistor (BJT) housed in a TO-92 three-pin through-hole package. It features a maximum collector current of -100 mA and a collector-emitter voltage rating of -30 V. The device supports a maximum power dissipation of 500 mW and operates within a temperature range of -55°C to +150°C. Key electrical specifications include a minimum DC current gain (hFE) starting at 100, depending on the specific sub-grade, and a transition frequency of up to 150 MHz for certain variants like the BC559BU.

Single Bipolar Transistors Feature Summary

• PNP polarity configuration suitable for complementary switching and amplification circuits
• Through-hole TO-92 packaging for standard board mounting
• General-purpose design optimized for low-power signal processing

Single Bipolar Transistors Applications

• General-purpose switching applications
• Low-noise amplifier stages
• Complementary pairs with NPN transistors

Single Bipolar Transistors Procurement Notes

Verify the specific suffix code (e.g., BTA, CTA, BU) as it dictates current gain ranges and transition frequencies. Confirm RoHS compliance status for the specific manufacturing lot. Check datasheet revisions for lead frame material changes. Ensure the selected variant matches the required hFE bin for the circuit design. Validate package dimensions against PCB footprint requirements.

Single Bipolar Transistors Selection Notes

Select based on required current gain bin; 'B' grades typically offer higher hFE than 'C' grades. Consider the BC559BU variant if higher transition frequency is needed. Verify thermal management capabilities given the 500 mW power limit. Ensure the -30 V voltage rating exceeds the circuit's peak operating voltage. Compare physical dimensions between TO-92 variants if space is constrained.

Single Bipolar Transistors Part Context

The BC559 belongs to the BC556-BC560 series of PNP transistors, designed as complementary counterparts to the BC546-BC550 NPN series. This family provides matched characteristics for push-pull configurations. The BC559 specifically targets general-purpose applications requiring moderate current handling and voltage ratings in a compact form factor.

Single Bipolar Transistors Replacement Considerations

Direct substitutes include BC559A, BC559B, BC559C, and BC559D, which differ primarily in hFE bins. Cross-reference with BC557 or BC558 for similar performance profiles.