BC550BBU Equivalent & Substitute Parts

Part Overview

The BC550BBU is an NPN bipolar junction transistor manufactured by onsemi, rated for 45 V collector-emitter breakdown voltage and 100 mA maximum collector current. This device is packaged in a TO-92-3 through-hole configuration and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and component sourcing in applications requiring NPN transistor functionality within the specified electrical parameters.

Key Parameters

Parameter	BC550BBU Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	45 V
Current - Collector (Ic) (Max)	100 mA
Power - Max	500 mW
Frequency - Transition	300 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2mA, 5V
Vce Saturation (Max) @ Ib, Ic	600mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	15nA (ICBO)
Mounting Type	Through Hole
Package / Case	TO-92-3 (TO-226AA)
Operating Temperature (Max)	150°C (TJ)

Substitute Part Grouping Explanation

Substitution of the BC550BBU is determined by electrical and mechanical compatibility across the following critical parameters:

Parametric Equivalents maintain identical or equivalent electrical specifications:

Transistor type (NPN)
Maximum collector-emitter breakdown voltage (45 V minimum)
Maximum collector current (100 mA)
Maximum power dissipation (500 mW)
Transition frequency (300 MHz)
DC current gain (hFE ≥ 200 @ 2mA, 5V)
Saturation voltage characteristics
Through-hole mounting in TO-92-3 package

Similar Parts share the same transistor type, package, and mounting method but may have variations in voltage rating, power rating, or frequency response that require circuit-level verification for specific applications.

Parameter Comparison

Parameter	BC550BBU (Main)	BC547B (Parametric Equivalent)	BC547BBU (Parametric Equivalent)	2N5232A PBFREE (Similar)
Manufacturer	onsemi	Diotec Semiconductor	onsemi	Central Semiconductor Corp
Product Status	Obsolete	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V	50 V
Current - Collector (Ic) (Max)	100 mA	100 mA	100 mA	100 mA
Power - Max	500 mW	500 mW	500 mW	625 mW
Frequency - Transition	300 MHz	300 MHz	300 MHz	Not specified
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2mA, 5V	200 @ 2mA, 5V	200 @ 2mA, 5V	250 @ 2mA, 5V
Vce Saturation (Max) @ Ib, Ic	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	125mV @ 1mA, 10mA
Current - Collector Cutoff (Max)	15nA (ICBO)	15nA	15nA (ICBO)	30nA
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)
Operating Temperature (Max)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)
RoHS Status	Not specified	Not applicable	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	Vendor Undefined	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

BC547B and BC547BBU are parametric equivalents to the BC550BBU. Both parts maintain identical electrical specifications across all critical parameters: 45 V breakdown voltage, 100 mA collector current, 500 mW power rating, 300 MHz transition frequency, and matching DC current gain characteristics. BC547BBU is manufactured by onsemi (same manufacturer as the main part) and carries ROHS3 compliance and REACH Unaffected status. BC547B is manufactured by Diotec Semiconductor and is actively produced. Both are suitable direct replacements in applications requiring the BC550BBU specifications.

2N5232A PBFREE is classified as a similar part rather than a parametric equivalent. While it shares the same transistor type, through-hole mounting, and TO-92-3 package, it differs in several electrical characteristics: 50 V breakdown voltage (5 V higher), 625 mW power rating (125 mW higher), and significantly different saturation voltage characteristics (125mV @ 1mA, 10mA versus 600mV @ 5mA, 100mA). The transition frequency is not specified for this device. This part is suitable for applications where the higher voltage and power ratings provide design margin, but circuit-level compatibility must be confirmed due to the saturation voltage differences.

All substitute parts are actively produced and available in inventory, providing reliable sourcing alternatives to the obsolete BC550BBU.

Frequently Asked Questions (FAQ)

Q: Can BC547B directly replace BC550BBU in all applications?

A: BC547B maintains identical electrical specifications to BC550BBU across all critical parameters: breakdown voltage, collector current, power dissipation, transition frequency, and DC current gain. Both are through-hole TO-92-3 packages. Direct replacement is supported by parametric equivalence.

Q: What is the difference between BC547B and BC547BBU?

A: Both parts are parametric equivalents with identical electrical specifications. The primary differences are manufacturer (Diotec Semiconductor for BC547B versus onsemi for BC547BBU) and packaging format (Cut Tape for BC547B versus Bulk for BC547BBU). BC547BBU carries ROHS3 compliance certification.

Q: Is 2N5232A PBFREE a direct replacement for BC550BBU?

A: 2N5232A PBFREE is a similar part, not a parametric equivalent. It shares the same transistor type and package but has different electrical characteristics: 50 V breakdown voltage, 625 mW power rating, and significantly different saturation voltage (125mV @ 1mA, 10mA). Use this part only when the higher voltage and power ratings are compatible with circuit requirements.

Q: Why does BC550BBU have obsolete status?

A: BC550BBU is classified as obsolete by the manufacturer. Parametric equivalents BC547B and BC547BBU are actively produced alternatives that maintain full electrical compatibility.

Q: Are all substitute parts RoHS compliant?

A: BC547BBU and 2N5232A PBFREE are ROHS3 compliant. BC547B has RoHS status listed as not applicable. All parts carry REACH Unaffected or Vendor Undefined status.

Q: Can these parts be used interchangeably in PCB designs?

A: BC550BBU, BC547B, and BC547BBU are all through-hole TO-92-3 packages with identical pin configurations and electrical specifications. They are mechanically and electrically interchangeable. 2N5232A PBFREE uses the same package but requires circuit-level verification due to electrical differences.

Q: What inventory levels are available for substitute parts?

A: BC547B has 19,651 units in stock. BC547BBU has 21,955 units in stock. 2N5232A PBFREE has 17,706 units in stock. All parts are available as new original stock.

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