BC556BTFR Equivalent & Substitute Parts

Part Overview

The BC556BTFR is a small-signal PNP bipolar junction transistor manufactured by onsemi, housed in a TO-92-3 through-hole package. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. The BC556BTFR serves general-purpose switching and amplification applications in consumer and industrial electronics requiring PNP transistor functionality with 65 V collector-emitter breakdown voltage and 100 mA maximum collector current ratings.

Equivalent and substitute parts are necessary due to the Last Time Buy status of the BC556BTFR, which restricts long-term availability. Alternative part numbers with identical or equivalent electrical and mechanical specifications ensure design continuity and supply chain reliability for ongoing production requirements.

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
Package / Case	TO-92-3 (TO-226AA)	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitute parts for the BC556BTFR are qualified based on strict electrical and mechanical parameter equivalence. The substitution logic is based on the following criteria:

Electrical Parameters (Must Match):

Transistor Type: PNP
Maximum Collector Current (Ic): 100 mA
Maximum Collector-Emitter Breakdown Voltage: 65 V
Vce Saturation: 650 mV @ 5 mA, 100 mA
Maximum Collector Cutoff Current (ICBO): 15 nA
Minimum DC Current Gain (hFE): 200 @ 2 mA, 5 V
Maximum Power Dissipation: 500 mW
Transition Frequency: 150 MHz
Maximum Operating Temperature: 150 °C

Mechanical Parameters (Must Match):

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

All substitute parts listed below meet these electrical and mechanical requirements without exception. Packaging format (Cut Tape, Bulk) does not affect electrical or mechanical compatibility and represents a supply chain variable only.

Parameter Comparison

Parameter	BC556BTFR (onsemi)	BC556BTA (Fairchild)	BC556BTF (onsemi)
Transistor Type	PNP	PNP	PNP
Current - Collector (Ic) (Max)	100 mA	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	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
Current - Collector Cutoff (Max)	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
Power - Max	500 mW	500 mW	500 mW
Frequency - Transition	150 MHz	150 MHz	150 MHz
Operating Temperature (TJ)	150 °C	150 °C	150 °C
Package / Case	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active

Engineering Selection Recommendations

BC556BTA (Fairchild Semiconductor): This substitute part is electrically and mechanically equivalent to the BC556BTFR across all specified parameters. The BC556BTA maintains Active product status, ensuring continued availability and supply chain stability. This part is supplied in Bulk packaging format. Selection of BC556BTA is appropriate for applications requiring immediate substitution due to BC556BTFR Last Time Buy constraints.

BC556BTF (onsemi): This substitute part is electrically and mechanically equivalent to the BC556BTFR and is manufactured by the same original equipment manufacturer (onsemi). The BC556BTF maintains Active product status and ROHS3 compliance certification identical to the main part. This part is supplied in Cut Tape packaging format, matching the original packaging specification of BC556BTFR. Selection of BC556BTF is appropriate for direct replacement with equivalent supply chain characteristics and compliance documentation.

Both substitute parts satisfy all electrical performance requirements and mechanical interface specifications. Selection between BC556BTA and BC556BTF depends on packaging format requirements and supply chain preferences. No performance degradation occurs with either substitute.

Frequently Asked Questions (FAQ)

Q: Can BC556BTA and BC556BTF be used interchangeably with BC556BTFR in existing circuit designs?

A: Yes. Both substitute parts are electrically and mechanically equivalent across all specified parameters including collector current, breakdown voltage, saturation characteristics, current gain, power dissipation, transition frequency, and operating temperature. The TO-92-3 through-hole package and pin configuration are identical. Direct substitution in existing PCB layouts and circuit designs is supported without modification.

Q: What is the difference between BC556BTA and BC556BTF?

A: The electrical and mechanical specifications are identical. The primary differences are manufacturer (Fairchild Semiconductor for BC556BTA versus onsemi for BC556BTF) and packaging format (Bulk for BC556BTA versus Cut Tape for BC556BTF). Both parts meet the same performance requirements and are suitable for equivalent applications.

Q: Why is BC556BTFR classified as Last Time Buy?

A: Last Time Buy status indicates that onsemi has discontinued production of the BC556BTFR. This classification restricts future availability and inventory replenishment. Transition to an active substitute part (BC556BTA or BC556BTF) is recommended for long-term design continuity and supply chain reliability.

Q: Are there any compliance or certification differences between the substitute parts and the main part?

A: BC556BTF maintains identical RoHS3 compliance and REACH Unaffected status as BC556BTFR. BC556BTA compliance documentation is not specified in the provided parameters. Both parts carry EAR99 ECCN classification and identical HTSUS codes (8541.21.0075), indicating equivalent regulatory treatment.

Q: Can BC556BTA be used in applications requiring RoHS3 compliance?

A: RoHS3 compliance status for BC556BTA is not specified in the provided parameters. For applications with mandatory RoHS3 compliance requirements, BC556BTF is the recommended substitute, as it carries explicit ROHS3 Compliant certification matching the original BC556BTFR specification.

Q: What packaging considerations apply when selecting between BC556BTA and BC556BTF?

A: BC556BTA is supplied in Bulk packaging, while BC556BTF is supplied in Cut Tape packaging. Both parts use identical TO-92-3 through-hole package format with formed leads. Packaging format selection depends on assembly process requirements, tape-and-reel compatibility, and inventory management preferences. No electrical or mechanical differences result from packaging format selection.

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