BC558BTFR Equivalent & Substitute Parts

Part Overview

The BC558BTFR 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 30 V, and a transition frequency of 150 MHz. The BC558BTFR is packaged in a TO-92-3 through-hole configuration with a maximum power dissipation of 500 mW.

The BC558BTFR is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production and repair requirements for legacy systems utilizing this transistor.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	100	mA
Voltage - Collector Emitter Breakdown (Max)	30	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

Substitution of the BC558BTFR is determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitution:

Electrical Parameters (Must Match):

Transistor Type: PNP
Current - Collector (Ic) (Max): 100 mA
Voltage - Collector Emitter Breakdown (Max): 30 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 (Must Match):

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

The BC559BTA meets all specified electrical and mechanical parameters and qualifies as a direct substitute for the BC558BTFR.

Parameter Comparison

Parameter	BC558BTFR	BC559BTA	Match
Manufacturer	onsemi	onsemi	Yes
Transistor Type	PNP	PNP	Yes
Current - Collector (Ic) (Max)	100 mA	100 mA	Yes
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	Yes
Vce Saturation (Max) @ Ib, Ic	650 mV @ 5 mA, 100 mA	650 mV @ 5 mA, 100 mA	Yes
Current - Collector Cutoff (Max)	15 nA	15 nA	Yes
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	Yes
Power - Max	500 mW	500 mW	Yes
Frequency - Transition	150 MHz	150 MHz	Yes
Operating Temperature (TJ)	150 °C	150 °C	Yes
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	Yes
Mounting Type	Through Hole	Through Hole	Yes
Product Status	Obsolete	Active	—
RoHS Status	Not Specified	ROHS3 Compliant	—

Engineering Selection Recommendations

The BC559BTA is a direct electrical and mechanical equivalent to the BC558BTFR. Both devices share identical electrical specifications across all critical parameters: collector current, breakdown voltage, saturation voltage, cutoff current, DC current gain, power dissipation, transition frequency, and operating temperature range. Both are packaged in the TO-92-3 through-hole configuration, ensuring pin-compatible board-level integration.

The BC559BTA holds an Active product status, whereas the BC558BTFR is classified as Obsolete. This status difference makes the BC559BTA the preferred selection for new designs and ongoing production requirements. The BC559BTA is ROHS3 Compliant, meeting current environmental and regulatory standards. Both devices maintain REACH Unaffected status and share identical ECCN and HTSUS classifications.

For applications currently utilizing the BC558BTFR, the BC559BTA provides seamless substitution without circuit redesign or performance compromise.

Frequently Asked Questions (FAQ)

Q: Can the BC559BTA be used as a direct replacement for the BC558BTFR in existing circuits?

A: Yes. The BC559BTA is electrically and mechanically equivalent to the BC558BTFR. All electrical parameters—collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency—are identical. Both devices use the TO-92-3 through-hole package with identical pin configuration, enabling direct substitution without circuit modification.

Q: What is the primary difference between the BC558BTFR and BC559BTA?

A: The BC558BTFR is classified as Obsolete, while the BC559BTA is Active. The BC559BTA is ROHS3 Compliant, meeting current environmental regulations. From an electrical and mechanical standpoint, the devices are equivalent.

Q: Are there any packaging differences between these parts?

A: No. Both the BC558BTFR and BC559BTA are packaged in TO-92-3 (TO-226AA) through-hole configuration with formed leads. The physical dimensions, pin spacing, and mounting method are identical.

Q: What compliance certifications apply to the BC559BTA?

A: The BC559BTA is ROHS3 Compliant and maintains REACH Unaffected status. Both devices share identical ECCN (EAR99) and HTSUS (8541.21.0075) classifications.

Q: Is the BC559BTA suitable for new product designs?

A: Yes. The BC559BTA is an Active product with current manufacturing support. It is the recommended choice for new designs requiring a PNP transistor with 100 mA collector current, 30 V breakdown voltage, and 150 MHz transition frequency in a through-hole package.

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