BC558CBU Equivalent & Substitute Parts

Part Overview

The BC558CBU 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 maximum power dissipation of 500 mW in a Through Hole TO-92-3 package. The BC558CBU is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max)	650	mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) Min	420	@ 2mA, 5V
Power - Max	500	mW
Frequency - Transition	150	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—

Substitute Part Grouping Explanation

Substitution of the BC558CBU 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): 650 mV @ 5mA, 100mA
Current - Collector Cutoff (Max): 15 nA
DC Current Gain (hFE) Min: 420 @ 2mA, 5V
Power - Max: 500 mW
Frequency - Transition: 150 MHz
Operating Temperature (TJ): 150 °C

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package / Case: TO-92-3

The BC559CTA meets all specified electrical and mechanical parameters and is classified as an active product, providing a direct functional equivalent for the obsolete BC558CBU.

Parameter Comparison

Parameter	BC558CBU	BC559CTA	Match
Transistor Type	PNP	PNP	✓
Current - Collector (Ic) Max	100 mA	100 mA	✓
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	✓
Vce Saturation (Max)	650 mV @ 5mA, 100mA	650 mV @ 5mA, 100mA	✓
Current - Collector Cutoff (Max)	15 nA	15 nA	✓
DC Current Gain (hFE) Min	420 @ 2mA, 5V	420 @ 2mA, 5V	✓
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-92-3	✓
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

The BC559CTA is the direct equivalent substitute for the BC558CBU. Both devices are manufactured by onsemi and share identical electrical and mechanical specifications across all critical parameters. The BC559CTA holds active product status, ensuring ongoing availability and supply chain continuity.

The BC559CTA is RoHS3 compliant and REACH unaffected, meeting current regulatory requirements. The BC558CBU, classified as obsolete, does not carry current compliance certifications. For new designs and production continuity, the BC559CTA is the appropriate selection.

Both parts are classified under ECCN EAR99 and HTSUS 8541.21.0075. The BC559CTA is supplied in Cut Tape (CT) packaging with formed leads, while the BC558CBU was supplied in bulk form. This packaging difference does not affect electrical or mechanical compatibility in circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the BC559CTA directly replace the BC558CBU in existing designs?

A: Yes. The BC559CTA and BC558CBU are electrically and mechanically identical across all specified parameters. Direct substitution is valid for all applications where the BC558CBU was originally specified.

Q: What is the primary reason for substituting the BC558CBU?

A: The BC558CBU is classified as obsolete. The BC559CTA is an active product from the same manufacturer with identical specifications, providing supply continuity and access to current production inventory.

Q: Are there packaging differences between these parts?

A: Both parts use the TO-92-3 Through Hole package. The BC559CTA features formed leads and is supplied in Cut Tape packaging, while the BC558CBU was supplied in bulk form. These packaging differences do not affect circuit compatibility or electrical performance.

Q: Do both parts meet current regulatory standards?

A: The BC559CTA is RoHS3 compliant and REACH unaffected. The BC558CBU, being obsolete, does not carry current compliance certifications. For applications requiring regulatory compliance, the BC559CTA is the appropriate choice.

Q: Are the electrical characteristics identical between these parts?

A: Yes. Both parts share identical specifications for collector current, breakdown voltage, saturation voltage, cutoff current, DC current gain, power dissipation, transition frequency, and operating temperature.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes. Both parts use the TO-92-3 package with identical pin configuration and Through Hole mounting, allowing direct PCB layout compatibility.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message