BCX51-TP Equivalent & Substitute Parts

Part Overview

The BCX51-TP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose interface applications. This surface mount device operates at 45 V maximum collector-emitter breakdown voltage with a maximum collector current of 1 A and 500 mW power dissipation. The part is currently in active product status with 1040 units in stock.

Substitute parts are necessary when the BCX51-TP becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when enhanced performance specifications are needed within compatible electrical parameters. The substitute parts listed maintain electrical compatibility through matching or exceeding the core specifications of the main part.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	1	A
Voltage - Collector Emitter Breakdown (Max)	45	V
Power Dissipation (Max)	500	mW
Frequency - Transition	50	MHz
Vce Saturation (Max)	500	mV @ 50mA, 500mA
DC Current Gain (hFE Min)	63	@ 150mA, 2V
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-243AA	—

Substitute Part Grouping Explanation

Substitution compatibility for the BCX51-TP is determined by the following electrical and mechanical parameters:

Primary Compatibility Criteria:

Transistor Type: PNP (required)
Collector Current (Max): ≥ 1 A (equal or greater)
Voltage - Collector Emitter Breakdown (Max): ≥ 45 V (equal or greater)
Vce Saturation (Max): ≤ 500 mV @ 50mA, 500mA (equal or lower)
Current - Collector Cutoff (Max): ≤ 100 nA (equal or lower)
Package / Case: TO-243AA (mechanical compatibility)
Mounting Type: Surface Mount (process compatibility)

Secondary Compatibility Criteria:

Power Dissipation (Max): ≥ 500 mW (equal or greater)
Frequency - Transition: ≥ 50 MHz (equal or greater)
Operating Temperature Range: Must include -55°C to 150°C or equivalent

All substitute parts listed meet or exceed these criteria. Parts with higher voltage ratings, higher power dissipation, or higher transition frequencies provide enhanced performance margins while maintaining full electrical compatibility.

Parameter Comparison

Parameter	BCX51-TP (Main)	2SB1122T-TD-E	BCX51-16,135	BCX5110TA	BCX51H6327XTSA1	BCX52TA
Manufacturer	Micro Commercial Co	onsemi	Nexperia USA Inc.	Diodes Incorporated	Infineon Technologies	Diodes Incorporated
Product Status	Active	Obsolete	Active	Active	Obsolete	Active
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP
Collector Current (Max)	1 A	1 A	1 A	1 A	1 A	1 A
Voltage - Collector Emitter Breakdown (Max)	45 V	50 V	45 V	45 V	45 V	60 V
Vce Saturation (Max)	500 mV	500 mV	500 mV	500 mV	500 mV	500 mV
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA	100 nA	100 nA	100 nA
Power Dissipation (Max)	500 mW	500 mW	1.3 W	1 W	2 W	1 W
Frequency - Transition	50 MHz	150 MHz	145 MHz	150 MHz	125 MHz	150 MHz
DC Current Gain (hFE Min)	63 @ 150mA, 2V	100 @ 100mA, 2V	100 @ 150mA, 2V	63 @ 150mA, 2V	40 @ 150mA, 2V	40 @ 150mA, 2V
Operating Temperature Range	-55 to 150°C	150°C (Max)	150°C (Max)	-65 to 150°C	150°C (Max)	-65 to 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
Packaging Format	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	—	Tape & Reel (TR)
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory (Pcs)	1040	50400	1530	25200	777	33087

Engineering Selection Recommendations

Active Product Status Substitutes (Recommended for New Designs):

BCX5110TA, BCX51-16,135, and BCX52TA are all active products with current manufacturing support. These parts provide enhanced performance specifications while maintaining full electrical compatibility with the BCX51-TP. BCX5110TA and BCX52TA offer extended operating temperature ranges (-65°C to 150°C) compared to the main part. BCX51-16,135 includes AEC-Q100 automotive qualification, suitable for applications requiring automotive-grade components.

Obsolete Product Status Substitutes (Use Only When Necessary):

2SB1122T-TD-E and BCX51H6327XTSA1 are obsolete products. These parts should only be selected when existing designs require exact part number compatibility or when inventory from previous manufacturing runs must be utilized. BCX51H6327XTSA1 carries AEC-Q101 automotive qualification and offers the highest power dissipation rating (2 W) among all listed substitutes.

Compliance Considerations:

All substitute parts maintain REACH Unaffected status and EAR99 export classification consistent with the main part. Parts with ROHS3 compliance certification (2SB1122T-TD-E, BCX51-16,135, BCX5110TA, BCX51H6327XTSA1, BCX52TA) are suitable for applications requiring environmental compliance. All parts feature Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements.

Packaging Format Selection:

The BCX51-TP is supplied in Bulk packaging. Substitute parts are available in Tape & Reel (TR) format, which is standard for automated assembly processes. Selection between bulk and tape & reel formats depends on manufacturing process requirements and volume considerations.

Frequently Asked Questions (FAQ)

Q: Can BCX52TA be used as a direct replacement for BCX51-TP?

A: Yes. BCX52TA meets all electrical compatibility criteria. It provides a higher collector-emitter breakdown voltage (60 V versus 45 V), extended operating temperature range (-65°C to 150°C), and higher power dissipation (1 W versus 500 mW). The TO-243AA package and surface mount configuration are identical. The higher voltage rating provides additional design margin without affecting circuit operation.

Q: What is the difference between BCX5110TA and BCX51-16,135?

A: Both parts are electrically compatible with BCX51-TP. BCX5110TA is manufactured by Diodes Incorporated and offers 150 MHz transition frequency with 1 W power dissipation. BCX51-16,135 is manufactured by Nexperia USA Inc. and offers 145 MHz transition frequency with 1.3 W power dissipation. BCX51-16,135 includes AEC-Q100 automotive qualification. Selection depends on manufacturer preference and automotive qualification requirements.

Q: Why are 2SB1122T-TD-E and BCX51H6327XTSA1 listed as obsolete?

A: These parts are no longer in active production by their respective manufacturers (onsemi and Infineon Technologies). They are included in the substitute list because they meet all electrical compatibility criteria and may be available from inventory sources. New designs should prioritize active products (BCX5110TA, BCX51-16,135, BCX52TA) to ensure long-term supply availability.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the TO-243AA package with surface mount configuration, ensuring mechanical compatibility with the BCX51-TP. However, packaging formats differ: BCX51-TP is supplied in Bulk, while most substitutes are supplied in Tape & Reel (TR) format. This affects handling and assembly processes but not electrical performance.

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

A: DC Current Gain varies among substitutes (ranging from 40 to 100 at specified test conditions). The BCX51-TP specifies a minimum of 63 at 150 mA and 2 V. All substitutes meet or exceed this minimum requirement. Higher hFE values (such as 100 in BCX51-16,135 and 2SB1122T-TD-E) indicate improved current amplification capability and may reduce base drive requirements in circuit designs.

Q: Can BCX51-TP be used in automotive applications?

A: The BCX51-TP itself does not carry automotive qualification. For automotive applications, BCX51-16,135 (AEC-Q100 qualified) or BCX51H6327XTSA1 (AEC-Q101 qualified) are appropriate substitutes. These parts meet automotive industry reliability and qualification standards.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials. All active substitute parts (BCX5110TA, BCX51-16,135, BCX52TA) are ROHS3 compliant. This certification is required for many applications, particularly in consumer electronics and European markets.

Q: How do transition frequency differences affect circuit performance?

A: The BCX51-TP operates at 50 MHz transition frequency. Substitute parts offer higher transition frequencies (125 to 150 MHz), providing greater bandwidth capability. Higher transition frequency allows the transistor to switch faster and operate at higher frequencies. For applications operating below 50 MHz, this difference is not significant. For high-frequency applications, substitutes with higher transition frequencies provide improved performance margins.

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