BC558BTA Equivalent & Substitute Parts

Part Overview

The BC558BTA is a PNP bipolar junction transistor (BJT) 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 BC558BTA is packaged in a TO-92-3 through-hole configuration with a maximum power dissipation of 500 mW.

The BC558BTA carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or repair requirements for legacy systems utilizing this component.

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 BC558BTA is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters establish the substitution criteria:

Transistor Type: PNP configuration
Maximum Collector Current: 100 mA
Collector-Emitter Breakdown Voltage: 30 V
Saturation Voltage: 650 mV @ 5 mA, 100 mA
Collector Cutoff Current: 15 nA (ICBO)
DC Current Gain (hFE): Minimum 200 @ 2 mA, 5 V
Maximum Power Dissipation: 500 mW
Transition Frequency: 150 MHz
Maximum Operating Temperature: 150 °C
Package Configuration: TO-92-3 through-hole

The BC559BTA meets all specified electrical parameters and maintains identical package geometry, making it a parametric equivalent for the BC558BTA.

Parameter Comparison

Parameter	BC558BTA	BC559BTA	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) @ Ib, Ic	650 mV @ 5 mA, 100 mA	650 mV @ 5 mA, 100 mA	✓
Current - Collector Cutoff (Max)	15 nA	15 nA	✓
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	✓
Power - Max	500 mW	500 mW	✓
Frequency - Transition	150 MHz	150 MHz	✓
Operating Temperature (TJ)	150 °C	150 °C	✓
Package / Case	TO-92-3	TO-92-3	✓
Mounting Type	Through Hole	Through Hole	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
REACH Status	REACH Unaffected	REACH Unaffected	✓

Engineering Selection Recommendations

The BC559BTA serves as a direct parametric equivalent to the BC558BTA. Both devices are manufactured by onsemi and share identical electrical specifications and package geometry.

Product Status Consideration: The BC558BTA is classified as obsolete, while the BC559BTA maintains active product status. Selection of the BC559BTA ensures access to current manufacturing stock and ongoing supplier support.

Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for electronic component procurement.

Packaging: The BC559BTA is supplied in cut tape (CT) packaging, whereas the BC558BTA does not specify a packaging format. Both utilize the TO-92-3 through-hole package configuration, ensuring mechanical and electrical compatibility in PCB applications.

Frequently Asked Questions (FAQ)

Q: Can the BC559BTA be used as a direct replacement for the BC558BTA?

A: Yes. The BC559BTA is a parametric equivalent with identical electrical specifications, including collector current, breakdown voltage, saturation voltage, current gain, power rating, and transition frequency. Both devices use the TO-92-3 through-hole package.

Q: What is the primary difference between the BC558BTA and BC559BTA?

A: The BC558BTA is classified as obsolete, while the BC559BTA maintains active product status. The BC559BTA is supplied in cut tape packaging. All electrical and mechanical parameters are identical.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both the BC558BTA and BC559BTA are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements.

Q: Will the BC559BTA function in existing PCB designs using the BC558BTA?

A: Yes. The BC559BTA maintains the same TO-92-3 through-hole package configuration and identical pin assignments, allowing direct substitution without PCB modification.

Q: What parameters must match for substitution eligibility?

A: Substitution requires equivalence in transistor type (PNP), maximum collector current (100 mA), collector-emitter breakdown voltage (30 V), saturation voltage (650 mV @ 5 mA, 100 mA), collector cutoff current (15 nA), DC current gain (200 @ 2 mA, 5 V), maximum power dissipation (500 mW), transition frequency (150 MHz), operating temperature (150 °C), and package configuration (TO-92-3 through-hole).

Q: Is the BC559BTA available in higher quantities than the BC558BTA?

A: The BC559BTA maintains active product status with current manufacturing availability. The BC558BTA, classified as obsolete, has limited remaining inventory. For new designs or ongoing production, the BC559BTA is the recommended selection.

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