BC549C_J35Z Equivalent & Substitute Parts

Part Overview

The BC549C_J35Z is an NPN bipolar junction transistor manufactured by onsemi, designed for small-signal amplification and switching applications. This device operates at a maximum collector current of 100 mA, collector-emitter breakdown voltage of 30 V, and maximum power dissipation of 500 mW. The part is housed in a TO-92-3 through-hole package with formed leads.

The BC549C_J35Z is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy systems utilizing this component.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	100	mA
Voltage - Collector Emitter Breakdown (Max)	30	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	420 @ 2 mA, 5 V	—
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 BC549C_J35Z is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters establish the substitution criteria:

Transistor Type: NPN configuration
Maximum Collector Current: 100 mA
Collector-Emitter Breakdown Voltage: 30 V
Saturation Voltage: 600 mV @ 5 mA, 100 mA
Collector Cutoff Current: 15 nA (ICBO)
DC Current Gain (hFE): 420 minimum @ 2 mA, 5 V
Maximum Power Dissipation: 500 mW
Transition Frequency: 300 MHz
Maximum Operating Temperature: 150 °C
Package Type: TO-92-3 through-hole configuration

Parts meeting all these parameters are classified as parametric equivalents and may be substituted in applications where the BC549C_J35Z was originally specified.

Parameter Comparison

Parameter	BC549C_J35Z (onsemi)	BC548CTA (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) @ Ib, Ic	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	✓
Current - Collector Cutoff (Max)	15 nA	15 nA	✓
DC Current Gain (hFE) (Min) @ Ic, Vce	420 @ 2 mA, 5 V	420 @ 2 mA, 5 V	✓
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-92-3	✓
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

The BC548CTA manufactured by Fairchild Semiconductor is a parametric equivalent to the BC549C_J35Z. All electrical specifications, thermal ratings, and mechanical package dimensions are identical across both devices.

The BC548CTA holds an active product status, ensuring ongoing availability and supply chain support. Both parts carry identical export control classifications (ECCN: EAR99) and harmonized tariff codes (HTSUS: 8541.21.0075), confirming regulatory equivalence.

The BC549C_J35Z is classified as obsolete, making the BC548CTA the appropriate selection for new designs, production continuity, and component replenishment. Direct pin-for-pin and functional substitution is supported without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the BC548CTA be used as a direct replacement for the BC549C_J35Z?

A: Yes. The BC548CTA meets all electrical and mechanical specifications of the BC549C_J35Z. Both devices are NPN transistors with identical maximum ratings, saturation characteristics, current gain, and TO-92-3 package configuration. Direct substitution is supported without circuit redesign.

Q: What is the primary advantage of selecting the BC548CTA over the BC549C_J35Z?

A: The BC548CTA maintains active product status, ensuring reliable supply chain availability and ongoing manufacturer support. The BC549C_J35Z is obsolete and subject to inventory depletion.

Q: Are there any package or pinout differences between these devices?

A: No. Both the BC549C_J35Z and BC548CTA use the TO-92-3 through-hole package with formed leads. Pinout configuration is identical, supporting direct board-level substitution.

Q: Do these transistors have the same thermal operating range?

A: Yes. Both devices operate at a maximum junction temperature (TJ) of 150 °C and are rated for identical power dissipation of 500 mW.

Q: Are there compliance or export restrictions affecting substitution?

A: No. Both parts carry identical ECCN (EAR99) and HTSUS (8541.21.0075) classifications, confirming equivalent regulatory status.

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