PBSS5250THR Equivalent & Substitute Parts

Part Overview

The PBSS5250THR is an active-status PNP bipolar junction transistor manufactured by Nexperia USA Inc. in the TO-236AB surface mount package. This component is designed for general-purpose switching and amplification applications requiring a 50 V collector-emitter breakdown voltage and 2 A maximum collector current. The device is qualified to AEC-Q101 automotive standards and carries ROHS3 compliance.

Substitute parts are identified to provide design flexibility when the primary part is unavailable or when application requirements permit operation within alternative electrical specifications. Substitution is valid only when the substitute part meets or exceeds the electrical and mechanical requirements of the target application.

Substiute Parts

PBSS5250THR

Nexperia USA Inc.In Stock: 2436PBSS5250THR Datasheet

Current PartRFQ

FSB660A

onsemiIn Stock: 20500FSB660A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PBSS5250THR with the FSB660A is valid based on the following electrical and mechanical compatibility criteria:

Matching Parameters:

• Transistor Type: Both are PNP devices
• Maximum Collector Current: Both rated at 2 A
• Vce Saturation: Both specified at 300mV @ 200mA, 2A
• Collector Cutoff Current: Both at 100nA (ICBO)
• Package / Case: Both available in TO-236-3, SC-59, SOT-23-3
• Mounting Type: Both surface mount
• RoHS Status: Both ROHS3 compliant
• Moisture Sensitivity Level: Both MSL 1 (Unlimited)

Allowable Differences:

• Voltage - Collector Emitter Breakdown: FSB660A rated at 60 V exceeds the PBSS5250THR requirement of 50 V, providing additional voltage margin
• Power Dissipation: FSB660A rated at 500 mW is lower than PBSS5250THR at 700 mW; applications must verify thermal requirements do not exceed 500 mW
• Frequency - Transition: FSB660A at 75MHz is lower than PBSS5250THR at 100MHz; applications requiring frequencies above 75MHz must retain the primary part
• DC Current Gain: FSB660A minimum of 250 @ 500mA, 2V exceeds PBSS5250THR minimum of 130 @ 2A, 2V
• Operating Temperature: FSB660A range of -55°C to 150°C differs from PBSS5250THR maximum of 175°C; applications requiring operation above 150°C must use the primary part

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection: The PBSS5250THR remains the specified component for applications requiring:

• Operating junction temperatures up to 175°C
• Transition frequency of 100MHz or higher
• Power dissipation up to 700 mW
• Automotive-grade qualification (AEC-Q101)

Substitute Part Selection: The FSB660A is suitable for applications where:

• Operating junction temperature does not exceed 150°C
• Transition frequency requirement is 75MHz or lower
• Power dissipation does not exceed 500 mW
• Higher collector-emitter breakdown voltage (60 V) is acceptable or beneficial
• Higher DC current gain is acceptable

Both parts maintain ROHS3 compliance, MSL 1 rating, and identical saturation characteristics. Package compatibility is direct in the TO-236-3 / SOT-23-3 form factor. Selection between these parts is determined by the specific thermal, frequency, and power requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can FSB660A be used as a direct replacement for PBSS5250THR in all applications?

A: No. FSB660A is suitable only for applications where operating junction temperature remains below 150°C, transition frequency requirement is 75MHz or lower, and power dissipation does not exceed 500 mW. Applications exceeding these limits require the PBSS5250THR.

Q: Are the packages physically identical?

A: Yes. Both PBSS5250THR and FSB660A are available in TO-236-3, SC-59, and SOT-23-3 packages. PCB footprints are directly compatible.

Q: What is the significance of the higher voltage rating on FSB660A?

A: The FSB660A collector-emitter breakdown voltage of 60 V exceeds the PBSS5250THR specification of 50 V. This provides additional voltage margin in applications operating near the 50 V limit but does not affect substitution validity for circuits designed within the 50 V specification.

Q: How do the DC current gain specifications compare?

A: PBSS5250THR specifies minimum hFE of 130 @ 2A, 2V. FSB660A specifies minimum hFE of 250 @ 500mA, 2V. The test conditions differ; direct comparison requires circuit-level analysis. FSB660A exhibits higher gain at the specified test point.

Q: Are there compliance or qualification differences?

A: PBSS5250THR carries AEC-Q101 automotive qualification. FSB660A specifications do not indicate automotive qualification. Applications requiring automotive-grade components must use PBSS5250THR.

Q: What thermal considerations apply to FSB660A substitution?

A: FSB660A maximum power dissipation is 500 mW compared to PBSS5250THR at 700 mW. Thermal design must ensure power dissipation remains within 500 mW limits. Additionally, FSB660A maximum operating temperature is 150°C versus 175°C for PBSS5250THR.

Q: Can FSB660A be used in high-frequency switching applications?

A: FSB660A transition frequency is 75MHz. Applications requiring switching frequencies above 75MHz must use PBSS5250THR at 100MHz.