BC557BTFR Equivalent & Substitute Parts

Part Overview

The BC557BTFR is a PNP bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 100 mA, collector-emitter breakdown voltage of 45 V, and maximum power dissipation of 500 mW in a Through Hole TO-92-3 package.

The BC557BTFR is classified as an obsolete product. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production, repair, and maintenance applications where this transistor is specified in existing designs.

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	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

Substitution of the BC557BTFR is determined by electrical and mechanical parameter equivalence across the following criteria:

Electrical Parameters:

Transistor type (PNP)
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)
DC current gain minimum (200 @ 2 mA, 5 V)
Maximum power dissipation (500 mW)
Transition frequency (150 MHz)
Operating temperature range (150°C)

Mechanical Parameters:

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

All substitute parts listed maintain identical electrical specifications and physical package compatibility with the BC557BTFR. Substitutes differ only in product status, packaging format (tape vs. formed leads), and compliance certifications.

Parameter Comparison

Parameter	BC557BTFR	BC557BTA	BC557BTF
Manufacturer	onsemi	onsemi	onsemi
Transistor Type	PNP	PNP	PNP
Current - Collector (Ic) (Max)	100 mA	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 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
Mounting Type	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
Product Status	Obsolete	Active	Active
Packaging Format	Formed Leads	Cut Tape (CT)	Cut Tape (CT)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BC557BTA is a direct substitute for the BC557BTFR with identical electrical specifications. This part is classified as Active product status, ensuring ongoing availability and supply chain continuity. The BC557BTA carries ROHS3 compliance certification and is supplied in Cut Tape packaging format. This configuration is suitable for automated assembly processes and high-volume production environments.

BC557BTF is a parametric equivalent to the BC557BTFR with identical electrical specifications. This part is classified as Active product status with the highest inventory availability (41,626 pieces in stock). The BC557BTF carries ROHS3 compliance certification and is supplied in Cut Tape packaging format. This configuration is suitable for automated assembly processes and high-volume production environments.

Both substitute parts maintain full electrical and mechanical compatibility with the BC557BTFR. Selection between BC557BTA and BC557BTF should be based on inventory availability, supply chain logistics, and packaging format requirements for the intended manufacturing process.

Frequently Asked Questions (FAQ)

Q: Can BC557BTA or BC557BTF be used as direct replacements for BC557BTFR in existing designs?

A: Yes. Both BC557BTA and BC557BTF are direct electrical and mechanical substitutes for BC557BTFR. All three parts share identical electrical specifications including collector current, breakdown voltage, saturation characteristics, current gain, power dissipation, and transition frequency. All three parts use the same TO-92-3 Through Hole package.

Q: What is the primary difference between BC557BTFR and its substitutes?

A: The BC557BTFR is classified as Obsolete, while BC557BTA and BC557BTF are Active products. The substitutes are supplied in Cut Tape packaging format, whereas the BC557BTFR uses Formed Leads. Both substitutes carry ROHS3 compliance certification.

Q: Are there any electrical performance differences between these parts?

A: No. BC557BTFR, BC557BTA, and BC557BTF are electrically identical. All three parts have the same maximum collector current (100 mA), breakdown voltage (45 V), saturation voltage (650 mV @ 5 mA, 100 mA), current gain (200 @ 2 mA, 5 V), power dissipation (500 mW), and transition frequency (150 MHz).

Q: Which substitute should be selected for new designs?

A: For new designs, either BC557BTA or BC557BTF is appropriate. Both are Active products with ROHS3 compliance. BC557BTF has significantly higher inventory availability (41,626 pieces) compared to BC557BTA (6,200 pieces), making it the preferred choice for high-volume applications.

Q: Are there any package compatibility considerations?

A: All three parts use the TO-92-3 Through Hole package with identical pin configuration and mechanical dimensions. The primary packaging difference is format: BC557BTFR uses Formed Leads, while BC557BTA and BC557BTF are supplied in Cut Tape format. This difference affects handling and assembly processes but does not impact electrical performance or physical fit in circuit board designs.

Q: Do the substitute parts meet current regulatory requirements?

A: Yes. Both BC557BTA and BC557BTF carry ROHS3 compliance certification and have REACH Unaffected status, meeting current environmental and regulatory requirements for electronic components.

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