BC556_J35Z Equivalent & Substitute Parts

Part Overview

The BC556_J35Z is a small-signal PNP bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. It features a maximum collector current of 100 mA, collector-emitter breakdown voltage of 65 V, and a transition frequency of 150 MHz. The device is packaged in a TO-92-3 through-hole configuration with a maximum power dissipation of 500 mW.

The BC556_J35Z is classified as an obsolete product. Locating equivalent substitute parts is necessary to support ongoing maintenance, repair, and production requirements for legacy systems and equipment utilizing this component.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	100	mA
Voltage - Collector Emitter Breakdown (Max)	65	V
Vce Saturation (Max) @ Ib, Ic	650 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	nA (ICBO)
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

Substitution of the BC556_J35Z is determined by strict equivalence across all critical electrical and mechanical parameters. A valid substitute must satisfy the following criteria:

Electrical Parameters (Required Match):

Transistor polarity: PNP
Maximum collector current: 100 mA
Collector-emitter breakdown voltage: 65 V
Vce saturation: 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 junction temperature: 150 °C

Mechanical Parameters (Required Match):

Mounting type: Through Hole
Package designation: TO-92-3 (TO-226AA)

The BC556ABU manufactured by Fairchild Semiconductor meets all specified electrical and mechanical parameters and is classified as an active product, making it a direct functional equivalent for the obsolete BC556_J35Z.

Parameter Comparison

Parameter	BC556_J35Z (onsemi)	BC556ABU (Fairchild Semiconductor)	Match
Transistor Type	PNP	PNP	✓
Current - Collector (Ic) (Max)	100 mA	100 mA	✓
Voltage - Collector Emitter Breakdown (Max)	65 V	65 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)	✓

Engineering Selection Recommendations

The BC556ABU is a direct substitute for the BC556_J35Z based on complete electrical and mechanical parameter equivalence. The BC556ABU is manufactured by Fairchild Semiconductor and maintains active product status, ensuring continued availability and supply chain reliability compared to the obsolete BC556_J35Z.

Both devices are classified under ECCN EAR99 and HTSUS 8541.21.0075, confirming regulatory compliance alignment. The BC556ABU is supplied in bulk packaging and is available in high inventory quantities, supporting both prototype and production-level applications.

Pin-to-pin compatibility and identical package geometry (TO-92-3) enable direct board-level substitution without circuit redesign or PCB modification.

Frequently Asked Questions (FAQ)

Q: Can the BC556ABU be used as a direct replacement for the BC556_J35Z without circuit modifications?

A: Yes. The BC556ABU is electrically and mechanically equivalent to the BC556_J35Z across all specified parameters. Pin configuration, package geometry, and electrical characteristics are identical, enabling direct substitution at the board level.

Q: What is the primary reason for substituting the BC556_J35Z?

A: The BC556_J35Z is classified as an obsolete product. The BC556ABU is an active product with established supply chain availability, making it the appropriate choice for new designs, repairs, and ongoing production support.

Q: Are there any differences in packaging between the BC556_J35Z and BC556ABU?

A: Both devices use the TO-92-3 (TO-226AA) through-hole package with formed leads. The BC556_J35Z is supplied in standard packaging, while the BC556ABU is supplied in bulk packaging. The physical package dimensions and pin assignments are identical.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the BC556_J35Z and BC556ABU are classified under ECCN EAR99 and HTSUS 8541.21.0075, confirming equivalent regulatory status.

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

A: Substitution compatibility is determined by matching transistor polarity (PNP), maximum collector current (100 mA), collector-emitter breakdown voltage (65 V), saturation voltage (650 mV @ 5 mA, 100 mA), collector cutoff current (15 nA), DC current gain (110 minimum @ 2 mA, 5 V), power dissipation (500 mW), transition frequency (150 MHz), and maximum operating temperature (150 °C).

Q: Is the BC556ABU suitable for high-frequency applications?

A: The BC556ABU supports a transition frequency of 150 MHz, matching the BC556_J35Z specification. It is suitable for applications within this frequency range.

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