BC557_J35Z Equivalent & Substitute Parts

Part Overview

The BC557_J35Z is a PNP bipolar junction transistor manufactured by onsemi, designed for small-signal switching and amplification applications. This component operates at a maximum collector current of 100 mA with a collector-emitter breakdown voltage of 45 V and delivers 500 mW maximum power dissipation. The device features a transition frequency of 150 MHz and is housed in a TO-92-3 through-hole package with formed leads.

The BC557_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	PNP	—
Current - Collector (Ic) (Max)	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max) @ Ib, Ic	650 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	110 @ 2 mA, 5 V	—
Power - Max	500	mW
Frequency - Transition	150	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the BC557_J35Z are identified based on electrical and mechanical parameter equivalence. The substitution criteria are strictly limited to the following parameters:

Transistor Type: PNP configuration
Maximum Collector Current: 100 mA
Collector-Emitter Breakdown Voltage: 45 V
Vce Saturation Characteristics: 650 mV @ 5 mA, 100 mA
Collector Cutoff Current: 15 nA (ICBO)
DC Current Gain (hFE): Minimum 110 @ 2 mA, 5 V
Maximum Power Dissipation: 500 mW
Transition Frequency: 150 MHz
Maximum Operating Temperature: 150 °C
Package Type: TO-92-3 through-hole configuration with formed leads

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

Parameter Comparison

Parameter	BC557_J35Z (onsemi)	BC557ATA (Fairchild Semiconductor)	Match
Transistor Type	PNP	PNP	✓
Current - Collector (Ic) (Max)	100 mA	100 mA	✓
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	✓
Vce Saturation (Max) @ Ib, Ic	650 mV @ 5 mA, 100 mA	650 mV @ 5 mA, 100 mA	✓
Current - Collector Cutoff (Max)	15 nA (ICBO)	15 nA (ICBO)	✓
DC Current Gain (hFE) (Min) @ Ic, Vce	110 @ 2 mA, 5 V	110 @ 2 mA, 5 V	✓
Power - Max	500 mW	500 mW	✓
Frequency - Transition	150 MHz	150 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 BC557ATA manufactured by Fairchild Semiconductor is a direct parametric equivalent to the BC557_J35Z. All electrical specifications, mechanical dimensions, and package configurations are identical across both components.

The BC557ATA carries an active product status, ensuring ongoing availability and supply chain continuity. This substitute part is suitable for direct replacement in applications currently utilizing the BC557_J35Z without circuit modification or performance degradation.

Both components maintain identical ECCN (EAR99) and HTSUS (8541.21.0075) classifications, confirming regulatory and compliance equivalence. The BC557ATA's active status provides a reliable long-term alternative for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can the BC557ATA be used as a direct replacement for the BC557_J35Z?

A: Yes. The BC557ATA meets all electrical and mechanical specifications of the BC557_J35Z. No circuit modifications are required for substitution.

Q: What is the primary reason for seeking a substitute for the BC557_J35Z?

A: The BC557_J35Z carries an obsolete product status. The BC557ATA provides an active, continuously available alternative with identical performance characteristics.

Q: Are the package dimensions identical between these two parts?

A: Yes. Both components use the TO-92-3 (TO-226AA) through-hole package with formed leads. Physical and electrical pin configurations are identical.

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

A: Yes. Both the BC557_J35Z and BC557ATA operate at a maximum junction temperature of 150 °C.

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

A: No. Both parts share identical ECCN and HTSUS classifications, confirming regulatory equivalence.

Q: What are the critical electrical parameters that define substitution eligibility?

A: Substitution eligibility is determined by matching transistor type (PNP), maximum collector current (100 mA), collector-emitter breakdown voltage (45 V), Vce saturation characteristics (650 mV @ 5 mA, 100 mA), DC current gain (110 @ 2 mA, 5 V), maximum power dissipation (500 mW), and transition frequency (150 MHz).

Q: Can the BC557ATA be used in high-frequency switching applications?

A: Yes. The BC557ATA maintains a transition frequency of 150 MHz, identical to the BC557_J35Z, supporting high-frequency switching and amplification applications.

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