BC550B_J35Z Equivalent & Substitute Parts

Part Overview

The BC550B_J35Z is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device operates at a maximum collector voltage of 45 V with a collector current rating of 100 mA and a maximum power dissipation of 500 mW. The transistor features a transition frequency of 300 MHz and is housed in a TO-92-3 through-hole package with formed leads.

The BC550B_J35Z is classified as obsolete. Equivalent substitute parts are available from active product lines that maintain identical electrical and mechanical specifications, ensuring direct functional replacement without circuit redesign.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Maximum Collector Current (Ic)	100	mA
Maximum Collector-Emitter Breakdown Voltage	45	V
Vce Saturation (Max)	600 mV @ 5 mA, 100 mA	—
Collector Cutoff Current (ICBO)	15	nA
DC Current Gain (hFE Min)	200 @ 2 mA, 5 V	—
Maximum Power Dissipation	500	mW
Transition Frequency	300	MHz
Package Type	TO-92-3 (TO-226AA)	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitute parts for the BC550B_J35Z are qualified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match):

Transistor type: NPN
Maximum collector current: 100 mA
Maximum collector-emitter breakdown voltage: 45 V
Vce saturation: 600 mV @ 5 mA, 100 mA
Collector cutoff current: 15 nA
DC current gain (hFE): 200 minimum @ 2 mA, 5 V
Maximum power dissipation: 500 mW
Transition frequency: 300 MHz

Mechanical Parameters (Must Match):

Package type: TO-92-3 (TO-226AA) with formed leads
Mounting type: Through hole

The substitute parts BC547B and BC547BBU meet all specified electrical and mechanical parameters and are therefore direct functional equivalents suitable for replacement in applications currently using the BC550B_J35Z.

Parameter Comparison

Parameter	BC550B_J35Z (onsemi)	BC547B (Diotec)	BC547BBU (onsemi)
Transistor Type	NPN	NPN	NPN
Maximum Collector Current	100 mA	100 mA	100 mA
Maximum Collector-Emitter Breakdown Voltage	45 V	45 V	45 V
Vce Saturation (Max)	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA
Collector Cutoff Current	15 nA	15 nA	15 nA
DC Current Gain (hFE Min)	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V
Maximum Power Dissipation	500 mW	500 mW	500 mW
Transition Frequency	300 MHz	300 MHz	300 MHz
Package Type	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

BC547B (Diotec Semiconductor) is suitable for applications requiring a substitute for the obsolete BC550B_J35Z. This part maintains all specified electrical and mechanical parameters. The BC547B is classified as active product status, ensuring continued availability. The part is supplied in cut tape packaging and carries an ECCN classification of EAR99. RoHS compliance status is not applicable for this device.

BC547BBU (onsemi) is an alternative substitute manufactured by onsemi, the original manufacturer of the BC550B_J35Z. This part is supplied in bulk packaging and is classified as active product status. The BC547BBU is ROHS3 compliant and carries REACH unaffected status, providing additional compliance documentation. The part maintains identical electrical specifications and TO-92-3 package configuration.

Both substitute parts are direct functional equivalents. Selection between BC547B and BC547BBU should be based on packaging requirements (cut tape versus bulk), compliance documentation needs, and supplier availability.

Frequently Asked Questions (FAQ)

Q: Can BC547B or BC547BBU be used as direct replacements for BC550B_J35Z in existing circuits?

A: Yes. Both substitute parts meet all specified electrical parameters (collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency) and are housed in the identical TO-92-3 through-hole package. No circuit modifications are required.

Q: What is the primary reason for substitution?

A: The BC550B_J35Z is classified as obsolete. The BC547B and BC547BBU are active products with equivalent specifications and continued manufacturing availability.

Q: Are there packaging differences between the substitute parts?

A: The BC547B is supplied in cut tape packaging, while the BC547BBU is supplied in bulk packaging. Both use the TO-92-3 package with formed leads. Packaging selection depends on application requirements and procurement volume.

Q: Do the substitute parts have different operating temperature ranges?

A: The BC547B specifies an operating temperature range of −55°C to 150°C. The BC547BBU specifies a maximum junction temperature of 150°C. Both parts are suitable for the thermal operating conditions of the BC550B_J35Z.

Q: What compliance certifications apply to the substitute parts?

A: The BC547B carries an ECCN classification of EAR99. The BC547BBU is ROHS3 compliant and carries REACH unaffected status. Both parts are classified under HTSUS code 8541.21.0075.

Q: Are there any electrical performance differences between the substitute parts?

A: No. All three parts (BC550B_J35Z, BC547B, and BC547BBU) meet identical electrical specifications for collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency.

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