FCX718TA Equivalent & Substitute Parts

Part Overview

The FCX718TA is a Surface Mount PNP Bipolar Junction Transistor manufactured by Diodes Incorporated, rated for 20V collector-emitter breakdown voltage and 2.5A maximum collector current. This device operates across an industrial temperature range of -55°C to 150°C and is packaged in the SOT-89-3 (TO-243AA) form factor. The FCX718TA is classified as an Active product with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	20	V
Current - Collector (Ic) (Max)	2.5	A
Power - Max	2	W
Frequency - Transition	180	MHz
Operating Temperature Range	-55 to 150	°C
Package / Case	TO-243AA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the FCX718TA is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: PNP (mandatory match)
Voltage - Collector Emitter Breakdown (Max): 20V (mandatory match)
Package / Case: TO-243AA (mandatory match)
Mounting Type: Surface Mount (mandatory match)
RoHS Status: ROHS3 Compliant (mandatory match)

Secondary Substitution Parameters:

Current - Collector (Ic) (Max): Substitute must equal or exceed 2.5A
Power - Max: Substitute must equal or exceed 2W
Frequency - Transition: Substitute must equal or exceed 180MHz
Operating Temperature: Substitute must support minimum -55°C to 150°C range

The identified substitute parts are grouped into two categories based on current rating capability:

Category A - Current Rating ≥ 2.5A (Direct Substitutes): Parts meeting or exceeding the 2.5A collector current specification with compatible electrical and thermal characteristics.

Category B - Current Rating < 2.5A (Reduced Current Substitutes): Parts with collector current ratings below 2.5A, suitable only for applications where maximum current demand does not exceed the substitute part's rating.

Parameter Comparison

Parameter	FCX718TA	BC869,115	BC869,135	BC869-25,115	PBSS5320X,135	PBSS5520X,135
Manufacturer	Diodes Incorporated	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	20V	20V	20V	20V	20V	20V
Current - Collector (Ic) (Max)	2.5A	1A	1A	2A	3A	5A
Power - Max	2W	1.2W	1.2W	500mW	1.6W	1.6W
Frequency - Transition	180MHz	140MHz	140MHz	140MHz	100MHz	100MHz
Operating Temperature (Max)	150°C	150°C	150°C	150°C	150°C	150°C
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	—	Automotive	Automotive	Automotive	Automotive	Automotive
Qualification	—	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100

Engineering Selection Recommendations

Direct Substitutes (Current Rating ≥ 2.5A):

PBSS5320X,135 and PBSS5520X,135 are qualified substitutes for applications requiring collector current capacity equal to or exceeding 2.5A. Both parts maintain the 20V voltage rating, TO-243AA package compatibility, and ROHS3 compliance. These devices carry Automotive grade classification with AEC-Q100 qualification, providing enhanced reliability documentation for automotive and industrial applications. The PBSS5520X,135 offers the highest current capacity at 5A, while the PBSS5320X,135 provides 3A capability. Both operate within the required temperature range and maintain Surface Mount compatibility.

Reduced Current Substitutes (Current Rating < 2.5A):

BC869,115, BC869,135, and BC869-25,115 are substitutes suitable only for applications where the maximum collector current requirement does not exceed their respective ratings (1A, 1A, and 2A). These parts maintain voltage and package compatibility with the FCX718TA. The BC869-25,115 variant approaches the 2.5A specification at 2A maximum collector current. All three BC869 variants carry Automotive grade and AEC-Q100 qualification. Selection from this group requires verification that circuit design does not demand the full 2.5A capability of the original FCX718TA.

Compliance and Certification:

All identified substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity rating (MSL 1), and REACH unaffected status, matching the environmental and regulatory profile of the FCX718TA. The Automotive grade and AEC-Q100 qualification of substitute parts provide additional quality assurance documentation suitable for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can BC869,115 or BC869,135 be used as direct replacements for FCX718TA?

A: BC869,115 and BC869,135 are not direct replacements due to reduced collector current rating (1A versus 2.5A). These parts are suitable only for applications where maximum collector current does not exceed 1A. Circuits designed for the full 2.5A capability of the FCX718TA will not operate correctly with these substitutes.

Q: What is the difference between BC869,115 and BC869,135?

A: BC869,115 and BC869,135 are electrically identical variants of the BC869 base product. Both are rated for 1A maximum collector current, 20V breakdown voltage, and 140MHz transition frequency. The suffix designations (115 and 135) indicate different packaging or distribution codes from Nexperia USA Inc. but do not reflect electrical parameter differences.

Q: Is BC869-25,115 a suitable substitute for FCX718TA?

A: BC869-25,115 approaches the current specification of FCX718TA with a 2A maximum collector current rating versus 2.5A. This part is suitable for applications where the design margin allows operation at 2A or below. Applications requiring the full 2.5A capability must use PBSS5320X,135 or PBSS5520X,135.

Q: Why do PBSS5320X,135 and PBSS5520X,135 have lower transition frequency than FCX718TA?

A: PBSS5320X,135 operates at 100MHz and PBSS5520X,135 operates at 100MHz, compared to FCX718TA at 180MHz. These frequency differences reflect design trade-offs in the semiconductor architecture. For applications where transition frequency below 180MHz is acceptable, these parts provide higher current capacity. Applications requiring 180MHz or higher transition frequency must use FCX718TA or equivalent high-frequency devices.

Q: Are all substitute parts available in the same SOT-89-3 package as FCX718TA?

A: All identified substitute parts use the TO-243AA package designation, which is mechanically and electrically compatible with SOT-89-3 footprints. Surface Mount assembly compatibility is maintained across all substitutes.

Q: What is the significance of Automotive grade and AEC-Q100 qualification on substitute parts?

A: Automotive grade classification and AEC-Q100 qualification indicate that substitute parts have undergone enhanced reliability testing and quality assurance protocols required for automotive applications. These certifications provide documented evidence of component reliability suitable for regulated automotive and industrial environments. The FCX718TA does not carry these designations in the provided specifications.

Q: Can PBSS5520X,135 be used in place of FCX718TA for all applications?

A: PBSS5520X,135 is electrically compatible with FCX718TA for voltage and package requirements, with superior current capacity (5A versus 2.5A). However, the reduced transition frequency (100MHz versus 180MHz) may limit suitability for high-frequency applications. Circuit design must confirm that 100MHz transition frequency meets application requirements before substitution.

Q: What inventory levels are available for substitute parts?

A: Current inventory levels are: BC869,115 (3100 Pcs), BC869,135 (1073 Pcs), BC869-25,115 (3219 Pcs), PBSS5320X,135 (9044 Pcs), and PBSS5520X,135 (2735 Pcs). FCX718TA maintains 16960 Pcs in stock. Inventory levels are subject to change and should be verified at time of procurement.

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