BST15TA Equivalent & Substitute Parts

Part Overview

The BST15TA is a PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-89-3 package. This device operates at a maximum collector current of 500 mA with a collector-emitter breakdown voltage of 200 V and a maximum power dissipation of 1 W. The BST15TA is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design requirements and production continuity.

Substiute Parts

BST15TA

Diodes IncorporatedIn Stock: 762BST15TA Datasheet

Current PartRFQ

CXTA92 TR PBFREE

Central Semiconductor CorpIn Stock: 10587CXTA92 TR PBFREE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BST15TA is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Transistor polarity must remain PNP
• Maximum collector current must equal or exceed 500 mA
• Collector-emitter breakdown voltage must equal or exceed 200 V
• Maximum power dissipation must equal or exceed 1 W
• Operating temperature range must encompass -65°C to 150°C

Mechanical Compatibility Criteria:

• Package type must be SOT-89 (TO-243AA equivalent)
• Surface mount mounting type required

The CXTA92 TR PBFREE from Central Semiconductor Corp meets all substitution criteria. This device provides enhanced electrical performance with higher breakdown voltage (300 V), improved transition frequency (50 MHz), and greater power rating (1.2 W), while maintaining identical collector current rating (500 mA) and compatible package configuration.

Parameter Comparison

Engineering Selection Recommendations

The CXTA92 TR PBFREE is the qualified substitute for the obsolete BST15TA. Selection of this alternative is supported by the following factors:

Product Status: The BST15TA is classified as obsolete, whereas the CXTA92 TR PBFREE maintains active product status with confirmed inventory availability (10,533 pieces in stock). This ensures long-term supply chain continuity.

Regulatory Compliance: The CXTA92 TR PBFREE is ROHS3 compliant, whereas the BST15TA is RoHS non-compliant. Both devices are REACH unaffected and carry EAR99 classification.

Electrical Performance: The CXTA92 TR PBFREE exceeds the electrical specifications of the BST15TA across multiple parameters. The higher collector-emitter breakdown voltage (300 V versus 200 V) and increased transition frequency (50 MHz versus 15 MHz) provide enhanced performance margins. The lower collector cutoff current (250 nA versus 50 µA) indicates improved leakage characteristics.

Mechanical Compatibility: Both devices utilize the SOT-89 surface mount package (TO-243AA), ensuring direct physical compatibility in existing PCB layouts without modification.

Packaging: The CXTA92 TR PBFREE is supplied in Tape & Reel (TR) format, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the CXTA92 TR PBFREE directly replace the BST15TA in existing designs?

A: Yes. Both devices are PNP transistors in the SOT-89 package with identical collector current ratings (500 mA) and compatible operating temperature ranges (-65°C to 150°C). The CXTA92 TR PBFREE provides equal or superior electrical performance across all critical parameters.

Q: What are the key differences between these two transistors?

A: The CXTA92 TR PBFREE offers higher collector-emitter breakdown voltage (300 V versus 200 V), faster transition frequency (50 MHz versus 15 MHz), greater power dissipation capability (1.2 W versus 1 W), and lower collector cutoff current (250 nA versus 50 µA). The CXTA92 TR PBFREE is also RoHS3 compliant and maintains active product status.

Q: Are there any circuit design modifications required when substituting the CXTA92 TR PBFREE for the BST15TA?

A: No circuit modifications are required. The CXTA92 TR PBFREE is electrically compatible with designs specified for the BST15TA. The enhanced performance characteristics of the substitute part provide additional design margin without requiring circuit alterations.

Q: What is the significance of the SOT-89 package designation?

A: The SOT-89 package (also designated TO-243AA) is a three-terminal surface mount package with identical pinout and footprint for both the BST15TA and CXTA92 TR PBFREE. This ensures direct PCB compatibility without layout modifications.

Q: Why is the BST15TA classified as obsolete?

A: The BST15TA is listed as obsolete by the manufacturer, indicating that production has been discontinued. The CXTA92 TR PBFREE is the recommended active alternative that fulfills the same functional requirements.

Q: Does the CXTA92 TR PBFREE meet current regulatory requirements?

A: Yes. The CXTA92 TR PBFREE is ROHS3 compliant, meeting current environmental and regulatory standards. The BST15TA is RoHS non-compliant, making the CXTA92 TR PBFREE the preferred choice for new designs and production runs subject to RoHS requirements.

Q: What is the difference between the Tape & Reel (TR) packaging of the CXTA92 and the standard packaging of the BST15TA?

A: Tape & Reel (TR) packaging is the standard format for automated assembly processes. This packaging method ensures component integrity during high-speed pick-and-place operations and is compatible with modern manufacturing equipment.