S9014-B-AP Equivalent & Substitute Parts

Part Overview

The S9014-B-AP is a Bipolar (BJT) NPN transistor manufactured by Micro Commercial Co, rated for 45 V collector-emitter breakdown voltage and 100 mA maximum collector current. This device is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement. The S9014-B-AP operates across a temperature range of -55°C to 150°C and is packaged in a Through Hole TO-92 configuration with RoHS3 compliance.

Substiute Parts

S9014-B-AP

Micro Commercial CoIn Stock: 740S9014-B-AP Datasheet

Current PartRFQ

2N3904TA

onsemiIn Stock: 5353592N3904TA Datasheet

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BC550CTA

onsemiIn Stock: 13803BC550CTA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the S9014-B-AP is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Transistor Type: NPN configuration required
• Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 45 V
• Current - Collector (Ic) Max: Must equal or exceed 100 mA
• Power - Max: Must equal or exceed 400 mW
• Operating Temperature Range: Must encompass -55°C to 150°C
• DC Current Gain (hFE): Must support circuit bias requirements

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: TO-92-3 (TO-226AA) Formed Leads

The substitute parts identified below satisfy these electrical and mechanical requirements while maintaining active product status and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

BC550CTA (Primary Substitute)

The BC550CTA is the preferred substitute for the S9014-B-AP. Both devices share identical voltage and current ratings (45 V, 100 mA), matching mechanical packaging (TO-92-3), and equivalent operating temperature range (-55°C to 150°C). The BC550CTA maintains active product status with onsemi as manufacturer, ensuring long-term availability. RoHS3 compliance and REACH unaffected status confirm regulatory alignment. The BC550CTA exhibits higher DC current gain (420 @ 2mA, 5V versus 100 @ 1mA, 5V), which may require circuit bias network adjustment in applications with strict gain specifications.

2N3904TA (Secondary Substitute)

The 2N3904TA is an alternative substitute with active product status from onsemi. This device exceeds the S9014-B-AP in collector current capacity (200 mA versus 100 mA) and power dissipation (625 mW versus 400 mW), providing design margin for higher-current applications. However, the 2N3904TA has a lower voltage rating (40 V versus 45 V), making it unsuitable for circuits requiring the full 45 V breakdown voltage specification. The 2N3904TA is appropriate only when collector current exceeds 100 mA and circuit voltage remains below 40 V.

Both substitute parts maintain Through Hole TO-92-3 packaging, enabling direct mechanical replacement without PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can the 2N3904TA replace the S9014-B-AP in all applications?

A: No. The 2N3904TA has a maximum collector-emitter breakdown voltage of 40 V, which is 5 V lower than the S9014-B-AP specification of 45 V. Use the 2N3904TA only in circuits where the maximum applied voltage does not exceed 40 V.

Q: What is the primary difference between BC550CTA and 2N3904TA as substitutes?

A: The BC550CTA matches the S9014-B-AP voltage rating (45 V) and current rating (100 mA) exactly. The 2N3904TA offers higher current capacity (200 mA) but reduced voltage rating (40 V). Select BC550CTA for voltage-critical applications and 2N3904TA for higher-current applications below 40 V.

Q: Are the substitute parts pin-compatible with the S9014-B-AP?

A: Yes. All three devices use the TO-92-3 package with identical pin configuration (Collector, Base, Emitter). Direct mechanical substitution is possible without PCB modification.

Q: Do the substitute parts have the same DC current gain as the S9014-B-AP?

A: No. The S9014-B-AP has a minimum DC current gain of 100 @ 1mA, 5V. The BC550CTA has 420 @ 2mA, 5V, and the 2N3904TA has 100 @ 10mA, 1V. Higher gain in the BC550CTA may require bias network recalculation for circuits with fixed base resistor values.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The S9014-B-AP, BC550CTA, and 2N3904TA are all RoHS3 compliant, meeting environmental and regulatory requirements for new designs.

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

A: Both BC550CTA and 2N3904TA operate across -55°C to 150°C, matching the S9014-B-AP temperature specification.

Q: Can I use BC550CTA and 2N3904TA interchangeably?

A: No. The BC550CTA is the direct electrical equivalent for the S9014-B-AP. The 2N3904TA is suitable only when circuit voltage remains below 40 V and higher collector current is acceptable.