BCX51-10-TP Equivalent & Substitute Parts

Part Overview

The BCX51-10-TP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, rated for 45V collector-emitter breakdown voltage and 1A maximum collector current in a surface mount SOT-89 package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Substitute parts are selected based on matching or exceeding electrical specifications while maintaining compatible package and mounting characteristics.

Key Parameters

Parameter	BCX51-10-TP Value
Transistor Type	PNP
Current - Collector (Ic) Max	1 A
Voltage - Collector Emitter Breakdown (Max)	45 V
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100nA (ICBO)
DC Current Gain (hFE) Min @ Ic, Vce	63 @ 150mA, 2V
Power - Max	500 mW
Frequency - Transition	50MHz
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-243AA
Supplier Device Package	SOT-89
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the BCX51-10-TP are selected based on the following critical parameters that determine functional compatibility:

Mandatory Matching Criteria:

Transistor Type: PNP
Current - Collector (Ic) Max: 1 A (minimum requirement)
Mounting Type: Surface Mount
Package / Case: TO-243AA (SOT-89 family)
Vce Saturation characteristics: 500mV @ 50mA, 500mA

Allowable Variation Parameters:

Voltage - Collector Emitter Breakdown: Equal to or greater than 45V
DC Current Gain (hFE): Equal to or greater than 63 @ 150mA, 2V
Power - Max: Equal to or greater than 500mW
Frequency - Transition: Equal to or greater than 50MHz
Operating Temperature: Must encompass or exceed -55°C to 150°C range
RoHS and MSL compliance: ROHS3 Compliant, MSL 1

Substitute parts meeting these criteria provide direct functional replacement with equal or enhanced performance characteristics.

Parameter Comparison

Parameter	BCX51-10-TP	BCX53-16-TP	2SB1122T-TD-E	BCX51-16,115	BCX5210TA	BCX5216TA	FCX591ATA
Manufacturer	Micro Commercial Co	Micro Commercial Co	onsemi	Nexperia USA Inc.	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Product Status	Obsolete	Active	Obsolete	Active	Active	Active	Active
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Current - Collector (Ic) Max	1 A	1 A	1 A	1 A	1 A	1 A	1 A
Voltage - Collector Emitter Breakdown (Max)	45 V	80 V	50 V	45 V	60 V	60 V	40 V
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 100mA, 1A
Current - Collector Cutoff (Max)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)	100nA
DC Current Gain (hFE) Min @ Ic, Vce	63 @ 150mA, 2V	100 @ 150mA, 2V	100 @ 100mA, 2V	100 @ 150mA, 2V	63 @ 150mA, 2V	100 @ 150mA, 2V	300 @ 100mA, 5V
Power - Max	500 mW	500 mW	500 mW	1.3 W	1 W	1 W	1 W
Frequency - Transition	50MHz	50MHz	150MHz	145MHz	150MHz	150MHz	150MHz
Operating Temperature	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	150°C (TJ)	150°C (TJ)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Supplier Device Package	SOT-89	SOT-89	PCP	SOT-89	SOT-89-3	SOT-89-3	SOT-89-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute - Active Status:

BCX51-16,115 (Nexperia USA Inc.) is the recommended primary substitute. This part maintains identical voltage and current ratings (45V, 1A) with the BCX51-10-TP, matching the base product number BCX51. The part is currently in active production status with AEC-Q100 automotive qualification, ensuring long-term availability and supply chain stability. Enhanced power rating (1.3W vs 500mW) and transition frequency (145MHz vs 50MHz) provide performance margin. Operating temperature range encompasses the original specification.

Secondary Substitutes - Active Status with Enhanced Ratings:

BCX5210TA and BCX5216TA (Diodes Incorporated) provide 60V breakdown voltage with 1A collector current, exceeding the 45V requirement. Both parts feature 150MHz transition frequency and 1W power dissipation. Operating temperature range extends to -65°C, providing enhanced low-temperature performance. These parts are in active production with high inventory availability.

BCX53-16-TP (Micro Commercial Co) offers 80V breakdown voltage with identical 1A current rating and 500mW power dissipation. This part maintains the same manufacturer as the original component, though it is rated for higher voltage applications.

Alternative Substitute - Obsolete Status:

2SB1122T-TD-E (onsemi) meets electrical requirements with 50V breakdown voltage and 1A collector current. This part is classified as obsolete; however, it maintains high inventory availability (50,400 pcs). The 150MHz transition frequency exceeds the original specification. Operating temperature specification is limited to 150°C maximum without lower temperature bound documentation.

Lower Voltage Alternative:

FCX591ATA (Diodes Incorporated) is rated for 40V breakdown voltage, which is below the 45V specification of the BCX51-10-TP. This part is suitable only for applications where the actual operating voltage does not approach the 45V rating. The part features exceptional DC current gain (300 @ 100mA, 5V) and is in active production status.

Frequently Asked Questions (FAQ)

Q: Can BCX51-16,115 directly replace BCX51-10-TP in existing designs?

A: Yes. BCX51-16,115 maintains identical voltage (45V) and current (1A) ratings with matching Vce saturation characteristics. The part uses the same TO-243AA package and SOT-89 supplier device package. Enhanced power rating and transition frequency provide performance margin without requiring circuit modification.

Q: What is the difference between SOT-89 and SOT-89-3 packages?

A: Both designations refer to the same TO-243AA physical package used for three-terminal surface mount transistors. The "-3" suffix in SOT-89-3 explicitly indicates three terminals. Parts using either designation are mechanically and electrically compatible in the same PCB footprint.

Q: Why is FCX591ATA listed as a substitute if it has only 40V rating?

A: FCX591ATA meets the mandatory electrical criteria (1A collector current, PNP type, SOT-89 package) and provides functional substitution for applications where the actual operating voltage remains below 40V. The 40V rating is below the original 45V specification and limits applicability to lower voltage circuits.

Q: Are there differences in thermal performance between substitute parts?

A: Yes. BCX51-16,115 is rated for 1.3W maximum power dissipation compared to 500mW for the original BCX51-10-TP. BCX5210TA, BCX5216TA, and FCX591ATA are rated for 1W. Higher power ratings indicate improved thermal capability. Operating temperature ranges vary: BCX51-16,115 and BCX53-16-TP specify -55°C to 150°C, while BCX5210TA, BCX5216TA, and FCX591ATA extend to -65°C minimum.

Q: Which substitute offers the best long-term availability?

A: BCX51-16,115 (Nexperia USA Inc.) is recommended for long-term availability. This part is in active production status with AEC-Q100 automotive qualification, indicating established supply chain infrastructure and production commitment. BCX5210TA and BCX5216TA (Diodes Incorporated) also maintain active status with substantial inventory levels.

Q: Can I use BCX53-16-TP in a 45V application?

A: Yes. BCX53-16-TP is rated for 80V breakdown voltage, which exceeds the 45V requirement. The part maintains 1A collector current and identical Vce saturation characteristics. The higher voltage rating provides design margin for applications with voltage transients or supply variations.

Q: What is the significance of the DC Current Gain (hFE) differences?

A: The BCX51-10-TP specifies minimum hFE of 63 @ 150mA, 2V. Most substitute parts (BCX53-16-TP, 2SB1122T-TD-E, BCX51-16,115, BCX5216TA) provide hFE of 100 or higher at the same test conditions, indicating improved current amplification. FCX591ATA specifies hFE of 300 @ 100mA, 5V, which is measured at different conditions. Higher hFE values reduce base drive requirements in circuit designs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original BCX51-10-TP specifications. This ensures compatibility with modern manufacturing processes and environmental regulations.

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