BSP52T1 NPN Darlington Transistor Equivalent & Substitute Parts

Part Overview

The BSP52T1 is an NPN Darlington bipolar junction transistor manufactured by onsemi, rated for 1 A collector current and 80 V collector-emitter breakdown voltage in a SOT-223 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The BSP52T1 remains available in inventory (2215 pcs) but alternative active components provide enhanced specifications and compliance certifications suitable for current manufacturing standards.

Substiute Parts

BSP52T1

onsemiIn Stock: 2320BSP52T1 Datasheet

Current PartRFQ

BSP52T1G

onsemiIn Stock: 64289BSP52T1G Datasheet

DirectRFQ

BSP52,115

Nexperia USA Inc.In Stock: 3167BSP52,115 Datasheet

UpgradeRFQ

FZT603TA

Diodes IncorporatedIn Stock: 23504FZT603TA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BSP52T1 is determined by electrical and mechanical compatibility within the NPN Darlington transistor category. The critical parameters for substitution are:

Electrical Compatibility Requirements:

• Transistor Type: NPN - Darlington configuration
• Voltage Rating: Collector-Emitter breakdown voltage of 80 V (minimum)
• Current Rating: Collector current capacity of 1 A (minimum)
• Package: SOT-223 (TO-261) surface mount form factor

Compliance and Status Requirements:

• Product Status: Active preferred for new designs; obsolete parts acceptable for legacy applications
• RoHS Compliance: ROHS3 compliant substitutes available
• Moisture Sensitivity: MSL 1 (Unlimited) maintained across all alternatives

The substitute parts are grouped into two categories:

Direct Equivalents (BSP52T1G, BSP52,115): These parts maintain the base electrical specifications (1 A, 80 V) and identical package format. Both are manufactured to current standards with active product status and full RoHS3 compliance.

Similar Alternative (FZT603TA): This part exceeds the minimum electrical specifications with 2 A collector current and 2 W power dissipation, providing design margin while maintaining 80 V voltage rating and SOT-223 package compatibility.

Parameter Comparison

Engineering Selection Recommendations

For RoHS3 Compliant Applications: Select BSP52T1G or BSP52,115 as direct replacements. Both parts maintain identical electrical specifications (1 A, 80 V) and package format while providing active product status and full ROHS3 compliance. BSP52T1G offers extended temperature range (-65°C to 150°C) suitable for industrial applications. BSP52,115 includes automotive qualification (AEC-Q101) and higher power rating (1.25 W) with 200 MHz transition frequency for enhanced performance margin.

For Applications Requiring Design Margin: FZT603TA provides doubled collector current capacity (2 A) and power dissipation (2 W) while maintaining 80 V voltage rating and SOT-223 package compatibility. This part is suitable for designs where thermal or current headroom is beneficial, though pin-for-pin compatibility with SOT-223 package must be verified for PCB layout.

For Legacy or Constrained Applications: BSP52T1 remains available in substantial inventory (2215 pcs) for existing designs where RoHS compliance is not mandated. However, transition to active alternatives is recommended for new production to ensure long-term supply chain stability and compliance with current manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can BSP52T1G be used as a direct replacement for BSP52T1?

A: Yes. BSP52T1G is a direct equivalent manufactured by onsemi with identical electrical specifications (1 A, 80 V) and SOT-223 package format. Pin configuration and functional performance are equivalent. BSP52T1G is active product status with ROHS3 compliance.

Q: What is the difference between BSP52T1G and BSP52,115?

A: Both parts meet the 1 A, 80 V electrical requirements and SOT-223 package specification. BSP52,115 (Nexperia) offers higher power rating (1.25 W vs 800 mW), 200 MHz transition frequency, and automotive qualification (AEC-Q101). BSP52T1G (onsemi) provides extended temperature range (-65°C to 150°C). Selection depends on application requirements for power dissipation, frequency response, and automotive certification.

Q: Is FZT603TA compatible with BSP52T1 in all applications?

A: FZT603TA is mechanically and electrically compatible within the SOT-223 package and maintains 80 V voltage rating. However, FZT603TA has doubled collector current (2 A vs 1 A) and power rating (2 W vs unspecified). This part is suitable for applications where the BSP52T1 operates below 1 A and 80 V limits. Circuit performance may differ due to higher current gain (5000 vs 2000 hFE) and lower saturation voltage.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. BSP52T1G, BSP52,115, and FZT603TA are all ROHS3 compliant. The original BSP52T1 is RoHS non-compliant. For applications requiring RoHS compliance, select from the three active alternatives.

Q: What is the moisture sensitivity level for these parts?

A: All parts including BSP52T1, BSP52T1G, BSP52,115, and FZT603TA are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or reflow processes.

Q: Can BSP52T1 be used in new designs?

A: BSP52T1 is classified as obsolete product status. For new designs, select from active alternatives: BSP52T1G, BSP52,115, or FZT603TA. Active product status ensures long-term availability, supply chain stability, and compliance with current manufacturing standards.

Q: What is the package difference between SOT-223 and SOT-223-3?

A: Both designations refer to the same physical SOT-223 (TO-261) surface mount package with four leads. The "-3" suffix in FZT603TA indicates a three-terminal configuration variant. Pin-for-pin compatibility is maintained for standard SOT-223 applications.