2SB647A-B-AP Equivalent & Substitute Parts

Part Overview

The 2SB647A-B-AP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, rated for 100V collector-emitter breakdown voltage and 1A maximum collector current. This device is packaged in a TO-92MOD through-hole configuration and is designed for general-purpose switching and amplification applications operating across a temperature range of -55°C to 150°C.

The 2SB647A-B-AP is classified as an obsolete product. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Substiute Parts

2SB647A-B-AP

Micro Commercial CoIn Stock: 9192SB647A-B-AP Datasheet

Current PartRFQ

BC640TA

onsemiIn Stock: 3513BC640TA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 2SB647A-B-AP is determined by the following critical parameters:

Mandatory Matching Criteria:

• Transistor Type: PNP configuration
• Current - Collector (Ic) (Max): 1 A or greater
• Mounting Type: Through Hole
• Package / Case: TO-92-3 compatible form factor

Allowable Parameter Variations:

• Voltage - Collector Emitter Breakdown (Max): Substitute must equal or exceed 100V
• Power - Max: Substitute must equal or exceed 900 mW
• Frequency - Transition: Substitute must equal or exceed 140 MHz
• Operating Temperature Range: Substitute must support the full -55°C to 150°C range or a subset thereof

The BC640TA meets all mandatory matching criteria and operates within acceptable parameter tolerances for direct substitution in applications designed for the 2SB647A-B-AP.

Parameter Comparison

Engineering Selection Recommendations

BC640TA as Direct Substitute:

The BC640TA is an active-production PNP bipolar junction transistor manufactured by onsemi that provides functional equivalence to the obsolete 2SB647A-B-AP for most general-purpose switching and amplification applications.

Compliance and Certification: Both the 2SB647A-B-AP and BC640TA are ROHS3 compliant, ensuring regulatory alignment for new designs and production continuity. The BC640TA is currently in active production status, providing assured long-term supply availability compared to the obsolete 2SB647A-B-AP.

Parameter Trade-offs: The BC640TA operates at a reduced maximum collector-emitter breakdown voltage of 80V compared to the 2SB647A-B-AP specification of 100V. Applications operating at voltages below 80V experience no functional limitation. Applications requiring operation above 80V require circuit redesign or alternative component selection.

The BC640TA exhibits superior saturation voltage performance (500mV versus 1V) and lower collector cutoff current (100nA versus 10µA), resulting in improved switching efficiency and reduced leakage in low-signal applications.

The BC640TA transition frequency of 100MHz is lower than the 2SB647A-B-AP specification of 140MHz. Applications requiring switching speeds above 100MHz require alternative component selection.

Packaging and Mounting: Both devices utilize identical TO-92-3 through-hole packaging, enabling direct mechanical and electrical substitution without circuit board redesign.

Frequently Asked Questions (FAQ)

Q: Can the BC640TA replace the 2SB647A-B-AP in all applications?

A: The BC640TA provides functional substitution for applications operating at collector-emitter voltages of 80V or below, transition frequencies of 100MHz or below, and requiring the specified current and power ratings. Applications exceeding these parameters require alternative component selection or circuit modification.

Q: What is the primary limitation of using BC640TA as a substitute?

A: The BC640TA maximum collector-emitter breakdown voltage is 80V, compared to the 2SB647A-B-AP specification of 100V. This represents a 20V reduction in maximum rated voltage. Circuit designs operating above 80V require component redesign.

Q: Are the packages physically identical?

A: Both the 2SB647A-B-AP and BC640TA utilize TO-92-3 through-hole packaging with formed leads. Physical dimensions and pin configurations are compatible, enabling direct board-level substitution without mechanical modification.

Q: What is the supply status difference between these parts?

A: The 2SB647A-B-AP is classified as obsolete and no longer in active production. The BC640TA is in active production status, ensuring ongoing availability and supply chain continuity for new applications and production requirements.

Q: How do the electrical performance characteristics compare?

A: The BC640TA demonstrates superior saturation voltage (500mV versus 1V at specified conditions) and lower collector cutoff current (100nA versus 10µA), indicating improved switching performance and reduced leakage. The 2SB647A-B-AP provides higher DC current gain (60 versus 40 at specified conditions) and higher transition frequency (140MHz versus 100MHz). Selection depends on application-specific performance requirements.

Q: Are both devices RoHS compliant?

A: Yes, both the 2SB647A-B-AP and BC640TA are ROHS3 compliant, meeting regulatory requirements for electronic component manufacturing and use.