BC547_J35Z Equivalent & Substitute Parts

Part Overview

The BC547_J35Z is an NPN bipolar junction transistor (BJT) manufactured by onsemi, designed for small-signal switching and amplification 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 part is housed in a TO-92-3 through-hole package rated for 500 mW power dissipation.

The BC547_J35Z carries an obsolete product status. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications currently utilizing this component.

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 BC547_J35Z is determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitution:

Electrical Parameters (Critical):

Transistor type: NPN
Maximum collector current: 100 mA
Collector-emitter breakdown voltage: 45 V
Vce saturation: 600 mV @ 5mA, 100mA
Collector cutoff current: 15 nA
DC current gain (hFE): 110 minimum @ 2mA, 5V
Transition frequency: 300 MHz
Maximum power dissipation: 500 mW
Operating temperature: 150°C

Mechanical Parameters (Critical):

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

Parts meeting all electrical and mechanical parameters are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Parameter	BC547_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 parametric equivalent substitute for the BC547_J35Z. All electrical specifications, mechanical dimensions, and package configurations are identical across both parts.

Selection Basis:

The BC547ATA carries an active product status, ensuring ongoing availability and supply chain support. The BC547_J35Z is classified as obsolete, making the BC547ATA the appropriate replacement for new designs and ongoing production requirements.

Both parts comply with identical regulatory frameworks (ECCN: EAR99; HTSUS: 8541.21.0075) and carry the same moisture sensitivity level (MSL 1 - Unlimited), confirming compatibility in handling, storage, and assembly processes.

Pin configuration, lead spacing, and through-hole mounting characteristics are identical, permitting direct board-level substitution without circuit redesign or PCB modification.

Frequently Asked Questions (FAQ)

Q: Can the BC547ATA be used as a direct replacement for the BC547_J35Z in existing designs?

A: Yes. The BC547ATA is a parametric equivalent with identical electrical ratings, package dimensions, and pin configuration. Direct substitution is supported without circuit modification.

Q: Are there differences in lead forming or package handling between these parts?

A: No. Both parts use the TO-92-3 (TO-226AA) package with formed leads. Lead spacing, diameter, and forming specifications are identical.

Q: Does the active product status of the BC547ATA affect compatibility?

A: No. Active product status indicates ongoing manufacturing and availability. Electrical and mechanical specifications remain unchanged. The BC547ATA is the recommended choice for supply chain continuity.

Q: Are moisture sensitivity requirements the same for both parts?

A: Yes. Both parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply equally to both components.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is determined by matching transistor type (NPN), collector current (100 mA), breakdown voltage (45 V), saturation voltage (600 mV), current gain (110 minimum), transition frequency (300 MHz), power rating (500 mW), operating temperature (150°C), and package type (TO-92-3 through-hole). All parameters must align for valid substitution.

Q: Can the BC547ATA be used in high-frequency switching applications?

A: The transition frequency specification of 300 MHz applies to both parts. Application suitability depends on circuit design requirements and operating conditions, not on substitution eligibility.

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