BC548B_J35Z Equivalent & Substitute Parts

Part Overview

The BC548B_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 BC548B_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	200	@ 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

Substitution of the BC548B_J35Z is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters establish the substitution criteria:

Electrical Parameters:

Transistor Type: NPN
Maximum Collector Current (Ic): 100 mA
Collector-Emitter Breakdown Voltage: 30 V
Vce Saturation: 600 mV @ 5mA, 100mA
Collector Cutoff Current (ICBO): 15 nA
DC Current Gain (hFE): 200 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

Substitute parts must satisfy all electrical specifications and maintain identical package and mounting characteristics. The BC548BTA meets these requirements and is classified as an active product, providing improved availability compared to the obsolete BC548B_J35Z.

Parameter Comparison

Parameter	BC548B_J35Z (onsemi)	BC548BTA (Fairchild Semiconductor)	Match
Transistor Type	NPN	NPN	✓
Current - Collector (Ic) Max	100 mA	100 mA	✓
Voltage - Collector Emitter Breakdown (Max)	30 V	30 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	200 @ 2mA, 5V	200 @ 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 BC548BTA manufactured by Fairchild Semiconductor is a direct parametric equivalent to the BC548B_J35Z. All electrical specifications, including collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency, are identical. The mechanical package and mounting configuration are also identical, enabling direct pin-for-pin substitution.

The BC548BTA holds active product status, ensuring continued availability and supply chain reliability. Both parts comply with ECCN EAR99 and HTSUS 8541.21.0075 classifications. The BC548BTA is available in bulk packaging with significantly higher inventory levels (9544 units in stock versus 670 units for the BC548B_J35Z).

Selection of the BC548BTA is appropriate for new designs, production runs, and repair applications where the BC548B_J35Z is no longer available. No circuit modifications or design changes are required when substituting the BC548BTA for the BC548B_J35Z.

Frequently Asked Questions (FAQ)

Q: Can the BC548BTA be used as a direct replacement for the BC548B_J35Z?

A: Yes. The BC548BTA is a parametric equivalent with identical electrical specifications and package configuration. Direct pin-for-pin substitution is possible without circuit modification.

Q: Are there any differences in electrical performance between these parts?

A: No. Both transistors meet identical specifications for collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency.

Q: Does the packaging differ between the BC548B_J35Z and BC548BTA?

A: No. Both parts use the TO-92-3 (TO-226AA) through-hole package with formed leads. Physical dimensions and pin configurations are identical.

Q: Why is the BC548B_J35Z classified as obsolete?

A: The BC548B_J35Z is an older product designation that has been superseded. The BC548BTA, manufactured by Fairchild Semiconductor, is the active equivalent product.

Q: What is the difference between bulk and other packaging options?

A: The BC548BTA is supplied in bulk packaging, which typically refers to standard tape-and-reel or loose component formats used for high-volume production. The BC548B_J35Z packaging designation was not specified in the available data.

Q: Are compliance certifications identical for both parts?

A: Both parts share the same ECCN (EAR99) and HTSUS (8541.21.0075) classifications, indicating equivalent regulatory compliance status.

Q: What is the maximum operating temperature for these transistors?

A: Both the BC548B_J35Z and BC548BTA have a maximum junction temperature (TJ) of 150 °C.

Q: Can these transistors be used in high-frequency applications?

A: Yes. Both transistors feature a transition frequency of 300 MHz, making them suitable for general-purpose switching and amplification applications up to this frequency range.

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