BC548C_J35Z Equivalent & Substitute Parts

Part Overview

The BC548C_J35Z is a small-signal 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 30 V, and a transition frequency of 300 MHz. The part is packaged in a TO-92-3 through-hole configuration with a maximum power dissipation of 500 mW.

The BC548C_J35Z is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications. Substitute parts must match the critical electrical and mechanical parameters to ensure functional compatibility without circuit redesign.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max)	600	mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) Min	420	@ 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)	—

Substitute Part Grouping Explanation

Substitute parts for the BC548C_J35Z are identified based on strict parametric equivalence across all critical electrical and mechanical specifications. The substitution logic is based on the following key parameters:

Electrical Parameters:

Transistor Type: NPN
Maximum Collector Current: 100 mA
Collector-Emitter Breakdown Voltage: 30 V
Vce Saturation: 600 mV @ 5mA, 100mA
Collector Cutoff Current: 15 nA
DC Current Gain (hFE): 420 minimum @ 2mA, 5V
Maximum Power Dissipation: 500 mW
Transition Frequency: 300 MHz
Maximum Operating Temperature: 150°C

Mechanical Parameters:

Mounting Type: Through Hole
Package: TO-92-3 (TO-226AA) with formed leads

Parts meeting all of these specifications are classified as parametric equivalents and may be substituted directly in applications designed for the BC548C_J35Z.

Parameter Comparison

Parameter	BC548C_J35Z (onsemi)	BC548CTA (Fairchild Semiconductor)
Transistor Type	NPN	NPN
Current - Collector (Ic) Max	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5mA, 100mA	600 mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	15 nA	15 nA
DC Current Gain (hFE) Min @ Ic, Vce	420 @ 2mA, 5V	420 @ 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 BC548CTA manufactured by Fairchild Semiconductor is a direct parametric equivalent to the BC548C_J35Z. Both devices share identical electrical specifications across all critical parameters, including collector current, breakdown voltage, saturation characteristics, current gain, power dissipation, and transition frequency. Both are packaged in the TO-92-3 through-hole configuration with formed leads, ensuring mechanical compatibility.

The primary distinction between these parts is product status: the BC548C_J35Z is obsolete, while the BC548CTA is active. This status difference makes the BC548CTA the preferred choice for new designs and ongoing production requirements. Both parts carry the same ECCN (EAR99) and HTSUS (8541.21.0075) classifications, indicating equivalent regulatory and trade compliance status.

Selection of the BC548CTA as a substitute for the BC548C_J35Z requires no circuit modifications, PCB layout changes, or application firmware adjustments. The devices are pin-compatible and functionally interchangeable within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can the BC548CTA be used as a direct replacement for the BC548C_J35Z?

A: Yes. The BC548CTA meets all electrical and mechanical specifications of the BC548C_J35Z. Both devices are NPN transistors with identical maximum ratings for collector current (100 mA), breakdown voltage (30 V), power dissipation (500 mW), and transition frequency (300 MHz). The TO-92-3 package and formed lead configuration are identical, ensuring pin-for-pin compatibility.

Q: Are there any differences in the package or pinout between these parts?

A: No. Both the BC548C_J35Z and BC548CTA use the TO-92-3 (TO-226AA) package with formed leads. The pinout is identical: Base, Collector, and Emitter in the standard TO-92 configuration. No PCB modifications are required.

Q: What is the significance of the product status difference?

A: The BC548C_J35Z is classified as obsolete, indicating that onsemi has discontinued production and support. The BC548CTA is active, meaning Fairchild Semiconductor continues to manufacture and support this part. For new designs and ongoing production, the active BC548CTA is the recommended choice to ensure long-term component availability.

Q: Do these parts have the same electrical performance characteristics?

A: Yes. The DC current gain (hFE), saturation voltage, cutoff current, and all other electrical parameters are identical. Both devices operate at the same maximum junction temperature (150°C) and support the same frequency range (300 MHz transition frequency).

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

A: No. Both parts carry the same ECCN (EAR99) and HTSUS (8541.21.0075) classifications. Moisture sensitivity level (MSL) for the BC548CTA is not specified in the provided data; however, the BC548C_J35Z carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions.

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