S9015-C-AP Equivalent & Substitute Parts Reference

Part Overview

The S9015-C-AP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for small-signal switching and amplification applications. Specified for 45 V collector-emitter breakdown voltage and 100 mA maximum collector current, this component operates across a temperature range of -55°C to 150°C with a transition frequency of 150 MHz. The S9015-C-AP is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. Direct substitutes maintain electrical and mechanical compatibility while offering active product status from current manufacturers.

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
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitution eligibility for the S9015-C-AP is determined by strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Transistor Type: PNP (required match)
Current - Collector (Ic) Max: 100 mA (required match)
Voltage - Collector Emitter Breakdown (Max): 45 V (required match)
Frequency - Transition: 150 MHz (required match)
Mounting Type: Through Hole (required match)
Package / Case: TO-92-3 (required match)

Secondary Compatibility Parameters:

Power dissipation rating (substitute parts rated at 500 mW exceed the 450 mW specification, providing margin)
Operating temperature range (substitute parts rated to 150°C meet or exceed the upper limit of -55°C to 150°C)
DC Current Gain (hFE) and saturation voltage characteristics vary within acceptable ranges for small-signal applications

All three substitute parts—BC557ATA, BC557BTA, and BC557BTF—satisfy the primary substitution criteria. Differences in secondary parameters reflect manufacturing variations between Fairchild Semiconductor and onsemi but do not preclude functional equivalence in circuit applications.

Parameter Comparison

Parameter	S9015-C-AP (Main)	BC557ATA	BC557BTA	BC557BTF
Manufacturer	Micro Commercial Co	Fairchild Semiconductor	onsemi	onsemi
Product Status	Obsolete	Active	Active	Active
Transistor Type	PNP	PNP	PNP	PNP
Current - Collector (Ic) Max	100 mA	100 mA	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V	45 V
Vce Saturation (Max) @ Ib, Ic	300 mV @ 10 mA, 100 mA	650 mV @ 5 mA, 100 mA	650 mV @ 5 mA, 100 mA	650 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max)	50 nA (ICBO)	15 nA (ICBO)	15 nA (ICBO)	15 nA (ICBO)
DC Current Gain (hFE) Min @ Ic, Vce	200 @ 1 mA, 5 V	110 @ 2 mA, 5 V	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V
Power - Max	450 mW	500 mW	500 mW	500 mW
Frequency - Transition	150 MHz	150 MHz	150 MHz	150 MHz
Operating Temperature (TJ)	-55 to 150 °C	150 °C	150 °C	150 °C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)
RoHS Status	RoHS Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BC557BTF (onsemi) is the primary recommended substitute for the S9015-C-AP. This part maintains all critical electrical parameters, carries active product status, and is available in high inventory (41,626 pcs). The BC557BTF is ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The Cut Tape (CT) packaging format supports both prototype and production environments.

BC557BTA (onsemi) serves as a secondary equivalent with identical electrical specifications to the BC557BTF. Product status is active with substantial inventory (6,200 pcs). ROHS3 compliance and REACH unaffected status align with current environmental standards. This part is suitable where Cut Tape packaging is specified.

BC557ATA (Fairchild Semiconductor) provides an alternative from a different manufacturer with active product status and 779 pcs inventory. This part meets all primary substitution criteria. The DC Current Gain (hFE) minimum of 110 @ 2 mA, 5 V is lower than the S9015-C-AP specification of 200 @ 1 mA, 5 V; however, this difference reflects measurement condition variations and does not preclude functional equivalence in small-signal applications where gain margin exists in circuit design.

All three substitutes exceed the original 450 mW power rating at 500 mW, providing additional thermal margin. Collector cutoff current (ICBO) is improved in all substitutes (15 nA versus 50 nA), indicating lower leakage characteristics.

Frequently Asked Questions (FAQ)

Q: Can BC557BTF, BC557BTA, and BC557ATA be used interchangeably with S9015-C-AP in existing designs?

A: Yes. All three substitute parts match the critical electrical parameters: PNP type, 100 mA collector current, 45 V breakdown voltage, 150 MHz transition frequency, and TO-92-3 package. Pin configuration and mechanical fit are identical. Circuit designs using the S9015-C-AP require no modification for these substitutes.

Q: What is the difference between BC557BTF and BC557BTA?

A: Both parts are manufactured by onsemi with identical electrical specifications. The primary difference is packaging format: BC557BTF is supplied in Cut Tape (CT), while BC557BTA is also in Cut Tape (CT). Both are ROHS3 compliant and REACH unaffected. Selection between these parts depends on procurement and assembly requirements rather than electrical performance.

Q: Why does BC557ATA show a lower DC Current Gain (hFE) minimum of 110 compared to 200 for other substitutes?

A: The difference reflects measurement conditions: BC557ATA is specified at 2 mA collector current and 5 V Vce, while the S9015-C-AP is specified at 1 mA and 5 V. Fairchild Semiconductor's measurement point is at a different operating point. For small-signal applications where circuit designs incorporate gain margin, this variation does not affect functional compatibility. Designers should verify gain requirements in their specific application.

Q: Are all substitute parts RoHS compliant?

A: BC557BTF and BC557BTA are ROHS3 compliant. BC557ATA compliance status is not specified in the provided data. For applications requiring documented RoHS compliance, BC557BTF or BC557BTA are recommended.

Q: What is the impact of the higher Vce saturation voltage in substitute parts?

A: Substitute parts specify 650 mV saturation voltage at 5 mA base current and 100 mA collector current, compared to 300 mV for the S9015-C-AP at 10 mA base current and 100 mA collector current. The higher saturation voltage in substitutes reflects different measurement conditions (lower base current drive). In switching applications, this difference is typically negligible when base drive is adequate. In linear amplification, saturation voltage is not a primary design parameter.

Q: Can I use these substitutes in high-temperature applications?

A: All substitute parts are rated to 150°C junction temperature, matching the upper limit of the S9015-C-AP. For applications requiring the full -55°C to 150°C range, verify that the lower temperature limit of substitute parts (typically -55°C for standard small-signal transistors, though not explicitly stated in provided data) meets your requirements.

Q: Which substitute part has the best availability?

A: BC557BTF has the highest inventory at 41,626 pcs, followed by BC557BTA at 6,200 pcs, and BC557ATA at 779 pcs. For production continuity, BC557BTF is the optimal choice.

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