FMBS549 Equivalent & Substitute Parts

Part Overview

The FMBS549 is a PNP bipolar junction transistor manufactured by onsemi, rated for 30 V collector-emitter breakdown voltage and 1 A maximum collector current. The device is housed in a SuperSOT™-6 (SOT-23-6) surface mount package and is designed for general-purpose switching and amplification applications with a maximum power dissipation of 700 mW.

The FMBS549 is classified as obsolete. Identifying equivalent and 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

FMBS549

onsemiIn Stock: 35314FMBS549 Datasheet

Current PartRFQ

PBSS4032PD,115

NXP SemiconductorsIn Stock: 2845PBSS4032PD,115 Datasheet

SimilarRFQ

PBSS9110D,115

NXP USA Inc.In Stock: 16976PBSS9110D,115 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FMBS549 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Transistor type must be PNP
• Voltage rating must equal or exceed 30 V collector-emitter breakdown
• Current rating must equal or exceed 1 A maximum collector current
• Power dissipation must equal or exceed 700 mW
• Transition frequency must equal or exceed 100 MHz
• Mounting type must be surface mount
• Operating temperature range must support 150°C maximum junction temperature
• Moisture sensitivity level must be 1 (Unlimited) or equivalent

Substitute Parts Identified:

1. PBSS4032PD,115 (NXP Semiconductors) — Exceeds all primary criteria with higher current rating (2.7 A), equivalent voltage rating (30 V), higher power dissipation (1 W), and equivalent transition frequency (104 MHz). Package is 6-TSOP surface mount.

2. PBSS9110D,115 (NXP USA Inc.) — Meets primary criteria with equivalent current rating (1 A), higher voltage rating (100 V), equivalent power dissipation (700 mW), and equivalent transition frequency (100 MHz). Package is 6-TSOP surface mount.

Parameter Comparison

Engineering Selection Recommendations

PBSS4032PD,115 Selection Criteria:

This substitute is appropriate for applications where the FMBS549 is used in circuits tolerating higher collector current capability. The PBSS4032PD,115 provides superior current handling (2.7 A versus 1 A) and increased power dissipation (1 W versus 700 mW) while maintaining the same 30 V voltage rating. The active product status ensures long-term availability and supply chain continuity. REACH compliance is confirmed. This part is suitable for designs requiring margin above the original 1 A specification or where thermal performance benefits from higher power rating.

PBSS9110D,115 Selection Criteria:

This substitute is appropriate for applications where the FMBS549 is used in circuits requiring higher voltage headroom. The PBSS9110D,115 provides a 100 V collector-emitter breakdown rating, exceeding the original 30 V specification by more than three times. Current and power ratings remain equivalent to the original part (1 A, 700 mW). The active product status ensures availability. REACH compliance is confirmed. This part is suitable for designs operating in higher voltage environments or where voltage margin is required for circuit reliability.

Both substitutes are surface mount devices with active product status, ensuring manufacturing support and supply availability. Selection between the two substitutes depends on circuit voltage and current requirements.

Frequently Asked Questions (FAQ)

Q: Can the PBSS4032PD,115 be used as a direct replacement for the FMBS549 in all applications?

A: The PBSS4032PD,115 meets or exceeds all electrical parameters of the FMBS549 (voltage, current, power, frequency). However, the package is 6-TSOP (SC-74, SOT-457) versus the original SuperSOT™-6 (SOT-23-6). Physical board layout compatibility must be verified before substitution. Pin configuration must also be confirmed to ensure correct circuit operation.

Q: What is the primary difference between the two substitute parts?

A: The PBSS4032PD,115 is optimized for higher current applications (2.7 A maximum) with equivalent voltage rating (30 V). The PBSS9110D,115 is optimized for higher voltage applications (100 V maximum) with equivalent current rating (1 A). Selection depends on whether the circuit requires increased current capacity or increased voltage headroom.

Q: Are both substitute parts compliant with REACH regulations?

A: The PBSS4032PD,115 is confirmed REACH Unaffected. The PBSS9110D,115 REACH status is not specified in the provided data. Compliance verification with the component supplier is recommended before final selection for regulated applications.

Q: Can the FMBS549 be used interchangeably with these substitutes in existing designs?

A: The FMBS549 is obsolete and no longer manufactured. The substitute parts are active products. Substitution is a one-way transition from the obsolete FMBS549 to an active substitute. Reverse substitution is not applicable.

Q: What is the moisture sensitivity level of the PBSS9110D,115?

A: The moisture sensitivity level for the PBSS9110D,115 is not provided in the available technical data. This specification should be obtained from the component supplier or datasheet before use in moisture-sensitive applications.

Q: Are the package dimensions compatible between the FMBS549 and the substitute parts?

A: The FMBS549 uses SuperSOT™-6 (SOT-23-6) packaging. Both substitutes use 6-TSOP (SC-74, SOT-457) packaging. These are different physical packages with different footprints. PCB layout redesign is required for substitution.