BC557B_D11Z Equivalent & Substitute Parts

Part Overview

The BC557B_D11Z is a PNP bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This component operates at a maximum collector current of 100 mA with a collector-emitter breakdown voltage of 45 V and a maximum power dissipation of 500 mW. The BC557B_D11Z is classified as an obsolete product, necessitating identification of active equivalent alternatives to ensure design continuity and procurement availability for new production runs and field replacements.

Key Parameters

Parameter	Value
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 (ICBO)
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 BC557B_D11Z is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute parts BC557BTA and BC557BTF are direct parametric equivalents, sharing identical specifications for collector current, breakdown voltage, saturation voltage, cutoff current, DC current gain, power dissipation, transition frequency, and operating temperature range. Both substitute parts maintain the same through-hole mounting configuration and TO-92-3 package designation.

The primary distinction between the obsolete BC557B_D11Z and its active substitutes lies in product status and packaging format. The BC557BTA and BC557BTF are both classified as active products with current manufacturing support. The BC557BTA is supplied in Cut Tape (CT) packaging, while the BC557BTF is also supplied in Cut Tape (CT) packaging. Both substitute parts are RoHS3 compliant and REACH unaffected, meeting modern regulatory requirements.

Parameter Comparison

Parameter	BC557B_D11Z (Main Part)	BC557BTA (Substitute)	BC557BTF (Substitute)
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 (ICBO)	15 nA (ICBO)	15 nA (ICBO)
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-226AA) Formed Leads	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99
HTSUS	8541.21.0075	8541.21.0075	8541.21.0075

Engineering Selection Recommendations

Both BC557BTA and BC557BTF are direct substitutes for the obsolete BC557B_D11Z. Selection between these two active alternatives is based on packaging and supply chain considerations rather than electrical performance differences.

The BC557BTA is suitable for applications requiring Cut Tape (CT) packaging format with RoHS3 compliance and active product status. This part is appropriate for new designs and production environments where regulatory compliance and long-term availability are required.

The BC557BTF is equally suitable as a substitute, also supplied in Cut Tape (CT) packaging with RoHS3 compliance and active product status. This part offers higher inventory availability (41,626 pieces in stock compared to 6,200 pieces for BC557BTA), making it the preferred choice for immediate procurement needs and high-volume applications.

Both substitute parts maintain identical electrical characteristics and mechanical compatibility with the original BC557B_D11Z, ensuring direct functional replacement in existing circuit designs without modification to PCB layouts or component footprints.

Frequently Asked Questions (FAQ)

Q: Can BC557BTA and BC557BTF be used interchangeably with BC557B_D11Z?

A: Yes. Both BC557BTA and BC557BTF are direct parametric equivalents to BC557B_D11Z. All critical electrical parameters, including collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency, are identical. Both parts use the same TO-92-3 through-hole package with formed leads, ensuring mechanical compatibility without PCB modification.

Q: What is the primary reason for substituting BC557B_D11Z?

A: The BC557B_D11Z is classified as an obsolete product. BC557BTA and BC557BTF are active products with current manufacturing support from onsemi, ensuring long-term availability and supply chain continuity for new production and field replacements.

Q: Are there compliance differences between the main part and substitutes?

A: Yes. The BC557BTA and BC557BTF are both RoHS3 compliant, while RoHS status is not specified for the obsolete BC557B_D11Z. All three parts are REACH unaffected and classified under ECCN EAR99. For applications requiring RoHS3 compliance, the substitute parts are the appropriate choice.

Q: What is the difference between BC557BTA and BC557BTF?

A: Both parts are electrically and mechanically identical. The primary difference is inventory availability. BC557BTF has significantly higher stock levels (41,626 pieces) compared to BC557BTA (6,200 pieces). For applications with immediate procurement requirements, BC557BTF is the preferred selection based on supply availability.

Q: Are the substitute parts suitable for through-hole PCB assembly?

A: Yes. Both BC557BTA and BC557BTF are through-hole mounted components in TO-92-3 package with formed leads, identical to the original BC557B_D11Z. These parts are directly compatible with existing through-hole PCB designs and assembly processes.

Q: What is the maximum operating temperature for these transistors?

A: The maximum junction temperature (TJ) for BC557B_D11Z, BC557BTA, and BC557BTF is 150°C. This specification is identical across all three parts.

Q: Can these PNP transistors be used in switching applications?

A: Yes. All three parts are suitable for switching applications. The 150 MHz transition frequency and 100 mA maximum collector current support general-purpose switching and amplification functions within the specified electrical limits.

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