S9015-B-AP Equivalent & Substitute Parts

Part Overview

The S9015-B-AP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, rated for 45 V collector-emitter breakdown voltage and 100 mA maximum collector current. This device is packaged in a TO-92 through-hole configuration and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute devices maintain electrical compatibility while offering active product status and improved availability.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Power - Max	450	mW
Frequency - Transition	150	MHz
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Operating Temperature Range	-55 to 150	°C

Substitute Part Grouping Explanation

Substitution of the S9015-B-AP is determined by electrical and mechanical compatibility across the following critical parameters:

Direct Substitutes (Electrical and Mechanical Equivalence):

Transistor type: PNP
Maximum collector current: 100 mA
Maximum collector-emitter breakdown voltage: 45 V
Package type: TO-92-3 through-hole
Frequency response: 150 MHz minimum

Parts meeting all these criteria are classified as direct substitutes and provide pin-compatible, functionally equivalent operation.

Similar Substitutes (Relaxed Electrical Parameters):

Parts exceeding the S9015-B-AP specifications in collector current, breakdown voltage, power dissipation, or frequency response
These devices operate within the application envelope of the original part but offer enhanced performance margins
Mechanical compatibility (TO-92-3 package) is maintained

Parameter Comparison

Parameter	S9015-B-AP	BC557ATA	BC557BTA	BC557BTF	2N3906TA
Manufacturer	Micro Commercial Co	Fairchild Semiconductor	onsemi	onsemi	Fairchild Semiconductor
Product Status	Obsolete	Active	Active	Active	Active
Transistor Type	PNP	PNP	PNP	PNP	PNP
Ic (Max)	100 mA	100 mA	100 mA	100 mA	200 mA
Vce Breakdown (Max)	45 V	45 V	45 V	45 V	40 V
Power - Max	450 mW	500 mW	500 mW	500 mW	625 mW
Frequency - Transition	150 MHz	150 MHz	150 MHz	150 MHz	250 MHz
Operating Temperature	-55 to 150°C	to 150°C	to 150°C	to 150°C	-55 to 150°C
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

BC557ATA and BC557BTA / BC557BTF (Direct Substitutes): These parts are recommended as primary replacements for the S9015-B-AP. Both devices maintain identical electrical ratings for collector current (100 mA), collector-emitter breakdown voltage (45 V), and transition frequency (150 MHz). All three parts are housed in TO-92-3 packages with formed leads, ensuring mechanical compatibility. BC557BTA and BC557BTF are manufactured by onsemi with active product status and ROHS3 compliance. BC557ATA is manufactured by Fairchild Semiconductor and is also active. The BC557BTF variant offers the highest inventory availability (41,626 units) among active substitutes.

2N3906TA (Similar Substitute): The 2N3906TA is classified as a similar substitute due to relaxed electrical specifications. This device exceeds the S9015-B-AP in collector current (200 mA versus 100 mA), power dissipation (625 mW versus 450 mW), and transition frequency (250 MHz versus 150 MHz). However, the collector-emitter breakdown voltage is reduced to 40 V, which is below the 45 V rating of the original part. The 2N3906TA maintains TO-92-3 package compatibility and active product status. This part is suitable for applications where the lower breakdown voltage is acceptable and the enhanced current and frequency capabilities provide design margin.

Frequently Asked Questions (FAQ)

Q: Can BC557ATA, BC557BTA, and BC557BTF be used interchangeably with S9015-B-AP?

A: Yes. These three parts are direct substitutes with identical electrical specifications for collector current (100 mA), collector-emitter breakdown voltage (45 V), and transition frequency (150 MHz). All are packaged in TO-92-3 through-hole configurations with formed leads. Pin configuration is identical, enabling direct replacement without circuit modification.

Q: What is the difference between BC557ATA, BC557BTA, and BC557BTF?

A: All three parts share identical electrical specifications. The primary differences are manufacturer (Fairchild Semiconductor for BC557ATA; onsemi for BC557BTA and BC557BTF) and packaging format (BC557BTA and BC557BTF are supplied in cut tape; BC557ATA packaging is not specified). BC557BTF has significantly higher inventory availability.

Q: Is the 2N3906TA a suitable replacement for S9015-B-AP?

A: The 2N3906TA is a similar substitute with enhanced performance in collector current (200 mA), power dissipation (625 mW), and transition frequency (250 MHz). However, its collector-emitter breakdown voltage is 40 V, which is 5 V lower than the S9015-B-AP specification of 45 V. This part is suitable only for applications where the reduced breakdown voltage does not exceed circuit requirements.

Q: Are all substitute parts RoHS compliant?

A: BC557BTA and BC557BTF are explicitly ROHS3 compliant. BC557ATA and 2N3906TA compliance status is not specified in the provided data. Verification with the manufacturer is required if RoHS compliance is a design requirement.

Q: What is the operating temperature range for substitute parts?

A: BC557ATA, BC557BTA, and BC557BTF are rated to 150°C maximum junction temperature. The lower temperature limit is not specified for these parts. The 2N3906TA is rated for -55°C to 150°C, matching the S9015-B-AP temperature range. Applications requiring operation below 0°C should use the 2N3906TA or verify lower temperature limits with the BC557 manufacturer.

Q: Are the substitute parts available in the same package configuration?

A: Yes. All substitute parts are packaged in TO-92-3 (TO-226-3) through-hole configurations with formed leads, identical to the S9015-B-AP. Direct mechanical substitution is possible without PCB modification.

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