BC547B_L34Z Equivalent & Substitute Parts

Part Overview

The BC547B_L34Z is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 100 mA, collector-emitter breakdown voltage of 45 V, and maximum power dissipation of 500 mW in a Through Hole TO-92-3 package.

The BC547B_L34Z is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the BC547B_L34Z are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match):

Transistor Type: NPN
Current - Collector (Ic) (Max): 100 mA
Voltage - Collector Emitter Breakdown (Max): 45 V
Vce Saturation (Max) @ Ib, Ic: 600 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max): 15 nA
DC Current Gain (hFE) (Min) @ Ic, Vce: 200 @ 2 mA, 5 V
Power - Max: 500 mW
Frequency - Transition: 300 MHz

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package / Case: TO-92-3 (TO-226AA)

All identified substitute parts meet these electrical and mechanical requirements and are therefore functionally equivalent to the BC547B_L34Z for direct replacement in circuit applications.

Parameter Comparison

Parameter	BC547B_L34Z (onsemi)	BC547B (Diotec)	BC547BBU (onsemi)
Transistor Type	NPN	NPN	NPN
Current - Collector (Ic) (Max)	100 mA	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max)	15 nA	15 nA	15 nA
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V
Power - Max	500 mW	500 mW	500 mW
Frequency - Transition	300 MHz	300 MHz	300 MHz
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)
Product Status	Obsolete	Active	Active
Manufacturer	onsemi	Diotec Semiconductor	onsemi

Engineering Selection Recommendations

BC547B (Diotec Semiconductor): This substitute part is manufactured by Diotec Semiconductor and maintains active product status. All electrical and mechanical parameters are identical to the BC547B_L34Z. The device is supplied in Cut Tape (CT) packaging with formed leads. This part provides continuity for applications requiring the BC547B_L34Z specification.

BC547BBU (onsemi): This substitute part is manufactured by onsemi, the original manufacturer of the BC547B_L34Z, and maintains active product status. All electrical and mechanical parameters are identical to the BC547B_L34Z. The device is supplied in Bulk packaging and is ROHS3 compliant. This part offers the advantage of sourcing from the original manufacturer while maintaining full electrical equivalence.

Both substitute parts satisfy the electrical and mechanical requirements for direct replacement. Selection between them depends on packaging requirements (Cut Tape versus Bulk) and supply chain preferences.

Frequently Asked Questions (FAQ)

Q: Can BC547B (Diotec) and BC547BBU (onsemi) be used interchangeably with BC547B_L34Z?

A: Yes. Both substitute parts meet all electrical parameters (collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency) and mechanical parameters (Through Hole mounting, TO-92-3 package) specified for the BC547B_L34Z. They are functionally equivalent for circuit applications.

Q: What is the difference between BC547B (Diotec) and BC547BBU (onsemi)?

A: The primary differences are manufacturer and packaging format. BC547B (Diotec) is supplied in Cut Tape (CT) with formed leads, while BC547BBU (onsemi) is supplied in Bulk packaging. Both maintain identical electrical specifications. BC547BBU carries ROHS3 compliance certification.

Q: Why is the BC547B_L34Z classified as obsolete?

A: The BC547B_L34Z is listed as obsolete by onsemi. However, equivalent active alternatives are available from both onsemi (BC547BBU) and Diotec Semiconductor (BC547B), ensuring continued availability for design support and production requirements.

Q: Are there any compliance or certification differences between these parts?

A: BC547BBU (onsemi) is ROHS3 compliant. The BC547B (Diotec) RoHS status is listed as not applicable. Both parts carry REACH Unaffected or Vendor Undefined status. Compliance requirements should be evaluated against specific application and regulatory standards.

Q: Can these transistors be soldered using the same process?

A: Yes. All three parts use Through Hole TO-92-3 packaging and are compatible with standard through-hole soldering processes. The BC547B (Diotec) features formed leads, which may require adjustment to lead spacing during insertion but does not affect soldering methodology.

Q: What inventory levels are available for these substitute parts?

A: BC547B (Diotec) has 19,651 pieces in stock. BC547BBU (onsemi) has 21,955 pieces in stock. Both parts maintain substantial inventory availability for production requirements.

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