How do the onsemi onsemi BC55 Series variants differ?

onsemi BC55 Series part numbers differ by case, DC current gain (hFE) (Min) @ ic, vce, frequency and operating temperature. Use the selection guide above to pick by case.

How many onsemi onsemi BC55 Series part numbers are listed?

8 onsemi onsemi BC55 Series part numbers are listed, each with specifications and a datasheet where available.

onsemi BC55 Series

8 variants · onsemi

About the onsemi onsemi BC55 Series series

The onsemi onsemi BC55 Series series groups 8 related part numbers, each listed with full specifications, a datasheet where available, and an RFQ option. The listed variants share a common current - collector (Ic) of 100 mA, current - collector cutoff of 15nA (ICBO) and mounting type of Through Hole. Variants differ by case, DC current gain (hFE) (Min) @ ic, vce and frequency, so you can match the exact case your application requires using the selection guide below.

Select a variant by

Case: TO-226-3, TO-92-3 (TO-226AA) · TO-226-3, TO-92-3 (TO-226AA) Formed Leads
DC current gain (hFE) (Min) @ ic, vce: 110 @ 2mA, 5V · 200 @ 2mA, 5V · 420 @ 2mA, 5V
Frequency: 150MHz · 300MHz
Operating temperature: 150°C (TJ) · 150°C(TJ)
Package: Bulk · Cut Tape (CT) Tape & Box (TB) · Tape & Reel (TR) Cut Tape (CT)
Transistor type: NPN · PNP
Vce saturation (Max) @ ib, ic: 600mV @ 5mA, 100mA · 650mV @ 5mA, 100mA
Voltage - collector emitter breakdown: 45 V · 65 V

Variant comparison

Parameter	BC550CBU	BC550CTA	BC556ABU	BC556ATA	BC557ATA	BC557BTA
Case	TO-226-3, TO-92-3 (TO-226AA)	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	TO-226-3, TO-92-3 (TO-226AA)	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
DC current gain (hFE) (Min) @ ic, vce	420 @ 2mA, 5V	420 @ 2mA, 5V	110 @ 2mA, 5V	110 @ 2mA, 5V	110 @ 2mA, 5V	200 @ 2mA, 5V
Frequency	300MHz	300MHz	150MHz	150MHz	150MHz	150MHz
Operating temperature	150°C (TJ)	150°C (TJ)	150°C(TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)
Package	Bulk	Cut Tape (CT) Tape & Box (TB)	Bulk	Cut Tape (CT) Tape & Box (TB)	Cut Tape (CT) Tape & Box (TB)	Cut Tape (CT) Tape & Box (TB)
Transistor type	NPN	NPN	PNP	PNP	PNP	PNP
Vce saturation (Max) @ ib, ic	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	650mV @ 5mA, 100mA	650mV @ 5mA, 100mA	650mV @ 5mA, 100mA	650mV @ 5mA, 100mA
Voltage - collector emitter breakdown	45 V	45 V	65 V	65 V	45 V	45 V

Shared specifications

Current - collector (Ic): 100 mA
Current - collector cutoff: 15nA (ICBO)
Mounting type: Through Hole
Power - max: 500 mW

Request a quote on any onsemi BC55 Series part number and we confirm price, availability and lead time per line — including end-of-life and allocation-constrained variants.

Frequently asked questions

How do the onsemi onsemi BC55 Series variants differ?: onsemi BC55 Series part numbers differ by case, DC current gain (hFE) (Min) @ ic, vce, frequency and operating temperature. Use the selection guide above to pick by case.
How many onsemi onsemi BC55 Series part numbers are listed?: 8 onsemi onsemi BC55 Series part numbers are listed, each with specifications and a datasheet where available.
How do I get pricing and lead time for onsemi onsemi BC55 Series?: Request a quote (RFQ) for any onsemi BC55 Series part number and we confirm price, availability and lead time per line — including end-of-life and hard-to-find variants.