BC547B_J35Z Equivalent & Substitute Parts

Part Overview

The BC547B_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 part is housed in a TO-92-3 through-hole package with formed leads.

The BC547B_J35Z is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers, ensuring design continuity and supply chain flexibility.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the BC547B_J35Z is determined by strict equivalence across the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor type: NPN
Maximum collector current: 100 mA (minimum)
Maximum collector-emitter breakdown voltage: 45 V (minimum)
Maximum power dissipation: 500 mW (minimum)
DC current gain (hFE): 200 or greater @ 2mA, 5V
Mounting type: Through Hole
Package compatibility: TO-92-3 or equivalent TO-226-3 form factor

Direct Equivalents are parts that match all primary criteria with identical electrical specifications and active product status. These parts are manufactured by different suppliers but maintain full functional and mechanical compatibility.

Similar Alternatives are parts that exceed the primary criteria in one or more parameters (higher voltage rating, higher power rating, or improved current gain) while maintaining the same package form factor and mounting type. These parts provide enhanced performance margins and are suitable for direct substitution in applications where the original specification is met or exceeded.

Parameter Comparison

Parameter	BC547B_J35Z (onsemi)	BC547B (Diotec)	BC547BBU (onsemi)	BC547BTF (onsemi)	2N5232A PBFREE (Central Semiconductor)
Product Status	Obsolete	Active	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN	NPN
Ic (Max)	100 mA	100 mA	100 mA	100 mA	100 mA
VCEO (Max)	45 V	45 V	45 V	45 V	50 V
Power (Max)	500 mW	500 mW	500 mW	500 mW	625 mW
fT	300 MHz	300 MHz	300 MHz	300 MHz	—
hFE (Min) @ Ic, Vce	200 @ 2mA, 5V	200 @ 2mA, 5V	200 @ 2mA, 5V	200 @ 2mA, 5V	250 @ 2mA, 5V
Vce Saturation (Max)	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	125mV @ 1mA, 10mA
ICBO (Max)	15 nA	15 nA	15 nA	15 nA	30 nA
Operating Temperature (TJ)	150°C	-55°C ~ 150°C	150°C	150°C	-65°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Packaging Type	—	Cut Tape (CT)	Bulk	Cut Tape (CT)	Bulk
RoHS Status	—	Not applicable	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	Vendor Undefined	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

The BC547B (Diotec Semiconductor), BC547BBU (onsemi), and BC547BTF (onsemi) are direct functional equivalents to the BC547B_J35Z. All three parts maintain identical electrical specifications across collector current, breakdown voltage, power dissipation, transition frequency, and current gain parameters. These parts are classified as active products, ensuring long-term availability and supply chain stability.

BC547BTF and BC547BBU are manufactured by onsemi, the original manufacturer of the BC547B_J35Z, providing design continuity and consistent performance characteristics. BC547BTF is supplied in cut tape packaging, while BC547BBU is supplied in bulk packaging. Both onsemi variants are ROHS3 compliant and REACH unaffected.

BC547B from Diotec Semiconductor is supplied in cut tape packaging and offers an extended operating temperature range of -55°C to 150°C, compared to the 150°C maximum of the original part. This extended range provides additional thermal margin for applications operating at lower ambient temperatures.

Similar Alternative (Enhanced Performance):

The 2N5232A PBFREE (Central Semiconductor Corp) exceeds the original specification in three parameters: maximum collector-emitter breakdown voltage (50 V versus 45 V), maximum power dissipation (625 mW versus 500 mW), and DC current gain (250 versus 200 @ 2mA, 5V). This part is suitable for applications where enhanced performance margins are beneficial. The 2N5232A PBFREE features an extended operating temperature range of -65°C to 150°C and is ROHS3 compliant and REACH unaffected.

Compliance Considerations:

All substitute parts listed are REACH unaffected or compliant, ensuring regulatory compliance for European markets. The onsemi variants (BC547BBU and BC547BTF) and the Central Semiconductor 2N5232A PBFREE are ROHS3 compliant, meeting current environmental and hazardous substance restrictions. The Diotec BC547B does not specify RoHS status; verification with the supplier is necessary for applications requiring explicit RoHS compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can BC547BTF be used as a direct replacement for BC547B_J35Z?

A: Yes. BC547BTF is a direct equivalent with identical electrical specifications. Both are NPN transistors with 100 mA maximum collector current, 45 V breakdown voltage, 500 mW power dissipation, and 300 MHz transition frequency. The primary difference is packaging format: BC547BTF is supplied in cut tape, while BC547B_J35Z was supplied in a different format. Both use the TO-92-3 package form factor and are compatible with the same PCB layouts and through-hole mounting processes.

Q: What is the difference between BC547BBU and BC547BTF?

A: BC547BBU and BC547BTF are electrically identical. The difference is in packaging and supply format. BC547BBU is supplied in bulk packaging, while BC547BTF is supplied in cut tape. Both are manufactured by onsemi and meet identical electrical specifications. Selection between these two depends on procurement requirements and assembly process compatibility.

Q: Can 2N5232A PBFREE replace BC547B_J35Z in all applications?

A: 2N5232A PBFREE meets or exceeds all electrical specifications of BC547B_J35Z and is mechanically compatible with the same TO-92-3 package. The higher voltage rating (50 V versus 45 V), higher power rating (625 mW versus 500 mW), and higher current gain (250 versus 200) provide enhanced performance margins. This part is suitable for direct substitution in applications where the original specification is met or exceeded. Applications with tight design margins or specific current gain requirements should verify compatibility with the higher hFE value.

Q: Does BC547B from Diotec Semiconductor have the same performance as the onsemi variants?

A: BC547B from Diotec Semiconductor is electrically equivalent to the onsemi BC547B_J35Z and BC547BTF across all primary electrical parameters. The Diotec variant offers an extended operating temperature range of -55°C to 150°C, compared to 150°C maximum for the onsemi parts. This extended range provides additional thermal margin for low-temperature applications. RoHS compliance status for the Diotec part should be confirmed with the supplier for applications requiring explicit compliance documentation.

Q: Are all substitute parts available in the same TO-92-3 package?

A: Yes. All substitute parts listed are housed in TO-92-3 or equivalent TO-226-3 form factor packages with formed leads. These packages are mechanically and electrically compatible with PCB layouts designed for the original BC547B_J35Z. No PCB redesign or mechanical modification is required for substitution.

Q: What is the significance of the PBFREE designation on 2N5232A PBFREE?

A: PBFREE indicates that the component is manufactured without lead (Pb) in the solder or plating materials, in compliance with RoHS (Restriction of Hazardous Substances) directives. This designation confirms environmental and regulatory compliance for applications subject to RoHS restrictions.

Q: Which substitute part has the best availability?

A: According to current inventory data, BC547BTF has the highest stock level at 22,801 pieces, followed by BC547BBU at 21,955 pieces. BC547B from Diotec has 19,651 pieces in stock, and 2N5232A PBFREE has 17,706 pieces. Availability may vary by distributor and time period; current stock levels should be confirmed with component suppliers.

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