BCX51-16-TP Equivalent & Substitute Parts

Part Overview

The BCX51-16-TP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for small-signal 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 1105 units in stock.

Substitute parts are necessary when the BCX51-16-TP becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for enhanced electrical performance characteristics within the same functional category.

Key Parameters

Parameter	Value	Unit
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)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 150mA, 2V	—
Power - Max	500	mW
Frequency - Transition	50	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-243AA	—
Supplier Device Package	SOT-89	—

Substitute Part Grouping Explanation

Substitution of the BCX51-16-TP is determined by the following critical electrical and mechanical parameters:

Mandatory Compatibility Parameters:

Transistor Type: PNP (all substitutes must be PNP configuration)
Current - Collector (Ic) Max: 1 A (substitutes must support 1 A or greater)
Voltage - Collector Emitter Breakdown: 45 V minimum (substitutes must support 45 V or greater)
Vce Saturation: 500mV @ 50mA, 500mA (substitutes must meet or exceed this specification)
Current - Collector Cutoff: 100nA maximum (substitutes must not exceed this value)
Mounting Type: Surface Mount (all substitutes are surface mount)
Package / Case: TO-243AA (all substitutes use TO-243AA package)

Performance Enhancement Parameters: Substitutes may exceed the following parameters without affecting functional compatibility:

DC Current Gain (hFE)
Power - Max
Frequency - Transition
Operating Temperature Range (upper limit)

Packaging Format: Substitutes are available in Bulk or Tape & Reel (TR) formats. Packaging format selection depends on manufacturing process requirements and does not affect electrical compatibility.

Parameter Comparison

Parameter	BCX51-16-TP (Main)	2SB1122T-TD-E	BCX51,115	BCX5110TA	BCX52-16,115
Manufacturer	Micro Commercial Co	onsemi	NXP USA Inc.	Diodes Incorporated	Nexperia USA Inc.
Transistor Type	PNP	PNP	PNP	PNP	PNP
Current - Collector (Ic) Max	1 A	1 A	1 A	1 A	1 A
Voltage - Collector Emitter Breakdown (Max)	45 V	50 V	45 V	45 V	60 V
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA	100 nA	100 nA
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 150mA, 2V	100 @ 100mA, 2V	63 @ 150mA, 2V	63 @ 150mA, 2V	100 @ 150mA, 2V
Power - Max	500 mW	500 mW	1.3 W	1 W	1.3 W
Frequency - Transition	50 MHz	150 MHz	145 MHz	150 MHz	145 MHz
Operating Temperature Range	-55 to 150°C	150°C (TJ)	150°C (TJ)	-65 to 150°C	150°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Supplier Device Package	SOT-89	PCP	SOT-89	SOT-89-3	SOT-89
Product Status	Active	Obsolete	Active	Active	Active
Packaging Format	Bulk	Tape & Reel (TR)	Bulk	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	Not specified	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	Not specified	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

BCX51,115 (NXP USA Inc.)

This substitute is recommended as the primary alternative to the BCX51-16-TP. Both parts maintain identical voltage and current specifications at 45 V and 1 A respectively. The BCX51,115 is in active product status with 4400 units in stock. Enhanced performance characteristics include higher power dissipation (1.3 W versus 500 mW) and increased transition frequency (145 MHz versus 50 MHz). The part is available in Bulk packaging format matching the original specification. This substitute provides direct functional compatibility with performance margin.

BCX5110TA (Diodes Incorporated)

This substitute is compatible with the BCX51-16-TP and is in active product status with 25200 units in stock. Electrical specifications match the mandatory compatibility parameters. The BCX5110TA offers enhanced transition frequency (150 MHz) and power dissipation (1 W). Operating temperature range extends to -65°C, providing broader environmental coverage. This part is available in Tape & Reel format and carries ROHS3 compliance with MSL 1 rating. Selection of this substitute is appropriate when tape and reel packaging is required for automated assembly processes.

BCX52-16,115 (Nexperia USA Inc.)

This substitute exceeds the voltage specification of the BCX51-16-TP at 60 V maximum collector-emitter breakdown, providing additional voltage margin. The part is in active product status with 5200 units in stock. Enhanced specifications include 1.3 W power dissipation and 145 MHz transition frequency. The BCX52-16,115 carries AEC-Q100 automotive qualification and ROHS3 compliance. This substitute is appropriate for applications requiring automotive-grade components or when higher voltage margin is beneficial. Available in Tape & Reel format.

2SB1122T-TD-E (onsemi)

This substitute meets all mandatory compatibility parameters with 50 V voltage specification and 1 A current rating. However, the part is in obsolete product status. The 2SB1122T-TD-E is not recommended for new designs or long-term supply chain planning. This part is included in the substitution list for reference only when addressing legacy system maintenance or when existing inventory must be utilized.

Frequently Asked Questions (FAQ)

Q: Can the BCX51-16-TP be replaced with any of these substitute parts in existing designs?

A: Yes, all active-status substitute parts (BCX51,115, BCX5110TA, and BCX52-16,115) are electrically compatible with the BCX51-16-TP. All substitutes maintain the mandatory electrical parameters: PNP configuration, 1 A collector current, minimum 45 V voltage rating, and identical saturation voltage specifications. The 2SB1122T-TD-E is electrically compatible but is obsolete and not recommended for new applications.

Q: What is the difference between Bulk and Tape & Reel packaging formats?

A: Bulk packaging contains loose components suitable for manual assembly or small-volume applications. Tape & Reel packaging presents components on continuous tape for automated pick-and-place assembly equipment. The electrical and mechanical specifications of the transistor are identical regardless of packaging format. Selection depends on manufacturing process requirements and assembly equipment capabilities.

Q: Why does the BCX52-16,115 have a higher voltage rating (60 V) than the BCX51-16-TP (45 V)?

A: The BCX52-16,115 is a higher-voltage variant within the same product family. The increased voltage rating provides additional design margin and allows operation in higher-voltage applications. When substituting the BCX51-16-TP with the BCX52-16,115, the circuit will operate safely at the original 45 V specification with additional voltage headroom available.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive 3, which restricts the use of specific hazardous materials in electrical and electronic equipment. Parts carrying ROHS3 compliance are suitable for applications subject to environmental and regulatory requirements in the European Union and other regions with equivalent standards.

Q: Is the BCX51,115 identical to the BCX51-16-TP?

A: The BCX51,115 and BCX51-16-TP share the same base product number (BCX51) and are functionally equivalent for the mandatory electrical parameters. The BCX51,115 offers enhanced performance with higher power dissipation (1.3 W versus 500 mW) and transition frequency (145 MHz versus 50 MHz). Both parts use the same TO-243AA package and SOT-89 supplier device package.

Q: Can I use the BCX5110TA in applications requiring operation below -55°C?

A: The BCX5110TA operating temperature range extends to -65°C, which exceeds the BCX51-16-TP specification of -55°C. The BCX5110TA is suitable for applications requiring operation at temperatures as low as -65°C. The BCX51-16-TP is limited to -55°C minimum operating temperature.

Q: Why is the 2SB1122T-TD-E listed as a substitute if it is obsolete?

A: The 2SB1122T-TD-E is included in the substitution reference for completeness and historical documentation. Obsolete parts may still be available from inventory or secondary sources but are not recommended for new designs or long-term applications due to uncertain future availability. Active-status alternatives should be prioritized for new applications.

Q: What does MSL 1 (Unlimited) moisture sensitivity level mean?

A: MSL 1 indicates the component has unlimited shelf life and does not require special moisture-control handling during storage and assembly. Parts with higher MSL ratings require controlled humidity environments and have limited shelf life after packaging is opened. MSL 1 components offer simplified supply chain and assembly logistics.

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

A: Yes, all substitute parts use the TO-243AA package designation. However, the supplier device package designation varies: SOT-89, PCP, and SOT-89-3 are different naming conventions for the same physical package used by different manufacturers. The physical dimensions and pin configurations are compatible across all substitutes.

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