BC550_J35Z Equivalent & Substitute Parts

Part Overview

The BC550_J35Z is an NPN bipolar junction transistor (BJT) manufactured by onsemi, designed for small-signal amplification and switching applications. This device features a maximum collector current of 100 mA, collector-emitter breakdown voltage of 45 V, and a transition frequency of 300 MHz. The BC550_J35Z is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity. Equivalent parts must maintain identical electrical performance characteristics and physical packaging to ensure direct replacement capability in existing circuit designs.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max)	600	mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) Min	110	@ 2mA, 5V
Power - Max	500	mW
Frequency - Transition	300	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BC550_J35Z is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters establish the substitution criteria:

Electrical Parameters (Must Match):

Transistor Type: NPN
Maximum Collector Current (Ic): 100 mA
Collector-Emitter Breakdown Voltage: 45 V
Vce Saturation: 600 mV @ 5mA, 100mA
Collector Cutoff Current (ICBO): 15 nA
DC Current Gain (hFE): 110 minimum @ 2mA, 5V
Maximum Power Dissipation: 500 mW
Transition Frequency: 300 MHz
Maximum Operating Temperature: 150 °C

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package: TO-92-3 (TO-226AA) with Formed Leads

The BC547ATA meets all specified electrical and mechanical parameters and qualifies as a parametric equivalent substitute for the BC550_J35Z.

Parameter Comparison

Parameter	BC550_J35Z (onsemi)	BC547ATA (Fairchild Semiconductor)	Match
Transistor Type	NPN	NPN	✓
Current - Collector (Ic) Max	100 mA	100 mA	✓
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	✓
Vce Saturation (Max)	600 mV @ 5mA, 100mA	600 mV @ 5mA, 100mA	✓
Current - Collector Cutoff (Max)	15 nA	15 nA	✓
DC Current Gain (hFE) Min	110 @ 2mA, 5V	110 @ 2mA, 5V	✓
Power - Max	500 mW	500 mW	✓
Frequency - Transition	300 MHz	300 MHz	✓
Operating Temperature (TJ)	150 °C	150 °C	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	✓
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

The BC547ATA manufactured by Fairchild Semiconductor is a direct parametric equivalent to the BC550_J35Z. All electrical specifications, including collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency, are identical. The physical package and mounting configuration are also identical, enabling direct pin-compatible replacement in through-hole PCB applications.

The BC547ATA holds Active product status, ensuring continued availability and supply chain stability compared to the obsolete BC550_J35Z. Both devices carry identical ECCN (EAR99) and HTSUS (8541.21.0075) classifications, confirming regulatory equivalence. The BC547ATA is available in significantly higher inventory quantities, supporting production requirements and reducing procurement lead times.

Frequently Asked Questions (FAQ)

Q: Can the BC547ATA be used as a direct replacement for the BC550_J35Z in existing designs?

A: Yes. The BC547ATA is electrically and mechanically identical to the BC550_J35Z across all specified parameters. Pin configuration, package dimensions, and electrical performance are equivalent, enabling direct substitution without circuit modification.

Q: Are there any differences in regulatory compliance between these parts?

A: No. Both the BC550_J35Z and BC547ATA share identical ECCN and HTSUS classifications, confirming equivalent regulatory status.

Q: Why is the BC550_J35Z classified as obsolete?

A: The BC550_J35Z is listed as obsolete by onsemi. The BC547ATA, maintained in Active status by Fairchild Semiconductor, provides continued availability for equivalent functionality.

Q: What is the significance of the TO-92-3 package specification?

A: The TO-92-3 package is a three-lead through-hole configuration with formed leads. Both the BC550_J35Z and BC547ATA use this identical package, ensuring mechanical compatibility and direct PCB mounting without adapter requirements.

Q: Are the DC current gain specifications identical between these transistors?

A: Yes. Both devices specify a minimum DC current gain (hFE) of 110 at 2 mA collector current and 5 V collector-emitter voltage, ensuring equivalent amplification characteristics in circuit applications.

Q: What inventory considerations should be evaluated?

A: The BC547ATA is available in significantly higher inventory quantities (16,814 pieces) compared to the BC550_J35Z (938 pieces), supporting production continuity and reducing procurement delays.

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