BC556B_J35Z Equivalent & Substitute Parts

Part Overview

The BC556B_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 65 V and a maximum power dissipation of 500 mW. The part is housed in a TO-92-3 through-hole package with formed leads.

The BC556B_J35Z currently holds an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for applications utilizing this transistor.

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
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2 mA, 5 V	—
Power - Max	500	mW
Frequency - Transition	150	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	—

Substitute Part Grouping Explanation

Substitute parts for the BC556B_J35Z are identified based on strict electrical and mechanical parameter equivalence. All substitute candidates must satisfy the following criteria:

Electrical Parameters (Required Match):

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
DC Current Gain (hFE) (Min) @ Ic, Vce: 200 @ 2 mA, 5 V
Power - Max: 500 mW
Frequency - Transition: 150 MHz
Operating Temperature (TJ): 150 °C

Mechanical Parameters (Required Match):

Mounting Type: Through Hole
Package / Case: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

All identified substitute parts meet these criteria and are therefore electrically and mechanically interchangeable with the BC556B_J35Z in applications requiring these specifications.

Parameter Comparison

Parameter	BC556B_J35Z (onsemi)	BC556BTF (onsemi)	BC556BTA (Fairchild)	BC556BTFR (Fairchild)
Transistor Type	PNP	PNP	PNP	PNP
Current - Collector (Ic) (Max)	100 mA	100 mA	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	65 V	65 V	65 V	65 V
Vce Saturation (Max) @ Ib, Ic	650 mV @ 5 mA, 100 mA	650 mV @ 5 mA, 100 mA	650 mV @ 5 mA, 100 mA	650 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max)	15 nA	15 nA	15 nA	15 nA
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V
Power - Max	500 mW	500 mW	500 mW	500 mW
Frequency - Transition	150 MHz	150 MHz	150 MHz	150 MHz
Operating Temperature (TJ)	150 °C	150 °C	150 °C	150 °C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Product Status	Obsolete	Active	Active	Active
Manufacturer	onsemi	onsemi	Fairchild Semiconductor	Fairchild Semiconductor

Engineering Selection Recommendations

BC556BTF (onsemi) is the primary direct substitute for the BC556B_J35Z. This part is manufactured by the same supplier (onsemi) and maintains active product status. The BC556BTF is supplied in cut tape packaging and is ROHS3 compliant, offering superior availability and compliance posture compared to the obsolete BC556B_J35Z. All electrical and mechanical parameters are identical.

BC556BTA (Fairchild Semiconductor) and BC556BTFR (Fairchild Semiconductor) are parametric equivalents manufactured by Fairchild Semiconductor. Both parts maintain active product status and satisfy all electrical and mechanical requirements. These alternatives provide additional sourcing options and support supply chain diversification. BC556BTA is supplied in bulk packaging, while BC556BTFR is also supplied in bulk packaging.

Selection among these three substitute parts should be based on:

Supplier preference and established procurement relationships
Packaging requirements (cut tape versus bulk)
Compliance certifications required for the end application
Inventory availability and lead time considerations

All three substitute parts are electrically and mechanically interchangeable with the BC556B_J35Z and require no circuit modifications for direct replacement.

Frequently Asked Questions (FAQ)

Q: Can BC556BTF, BC556BTA, and BC556BTFR be used interchangeably with BC556B_J35Z?

A: Yes. All three substitute parts meet identical electrical specifications (100 mA collector current, 65 V breakdown voltage, 500 mW power dissipation, 150 MHz transition frequency, 200 minimum DC current gain) and are housed in the same TO-92-3 through-hole package. Direct substitution is possible without circuit modifications.

Q: What is the primary difference between BC556BTF and BC556BTA?

A: The primary difference is the manufacturer and packaging format. BC556BTF is manufactured by onsemi and supplied in cut tape packaging. BC556BTA is manufactured by Fairchild Semiconductor and supplied in bulk packaging. Electrical and mechanical specifications are identical.

Q: Why is BC556B_J35Z listed as obsolete?

A: The BC556B_J35Z has reached end-of-life status. Active alternatives with identical specifications are available from onsemi (BC556BTF) and Fairchild Semiconductor (BC556BTA, BC556BTFR), ensuring continued design support and component availability.

Q: Are there any compliance differences between the substitute parts?

A: BC556BTF is ROHS3 compliant. All substitute parts carry REACH Unaffected status and EAR99 ECCN classification, consistent with the original BC556B_J35Z. Compliance requirements should be verified against specific application and regional regulations.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (cut tape versus bulk) affects only handling, storage, and procurement logistics. Electrical performance and specifications remain identical across all substitute parts.

Q: Can BC556B_J35Z be used in new designs?

A: No. Due to obsolete status, BC556B_J35Z should not be specified for new designs. BC556BTF, BC556BTA, or BC556BTFR should be selected instead to ensure long-term component availability and supply chain continuity.

Q: What are the key parameters that determine substitutability?

A: Substitutability is determined by matching transistor type (PNP), maximum collector current (100 mA), collector-emitter breakdown voltage (65 V), saturation voltage (650 mV @ specified conditions), collector cutoff current (15 nA), DC current gain (200 minimum), power dissipation (500 mW), transition frequency (150 MHz), operating temperature (150 °C), and package type (TO-92-3 through-hole). All substitute parts satisfy these criteria.

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