BSR43,115 Equivalent & Substitute Parts

Part Overview

The BSR43,115 is an NPN bipolar junction transistor manufactured by Nexperia USA Inc., designed for surface mount applications in the SOT-89 package. This active product operates at a maximum collector current of 1 A with a collector-emitter breakdown voltage of 80 V, making it suitable for general-purpose switching and amplification circuits. The device is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified based on matching or exceeding the electrical performance parameters while maintaining compatibility with the SOT-89 package footprint and surface mount assembly requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	1	A
Voltage - Collector Emitter Breakdown (Max)	80	V
Vce Saturation (Max)	500	mV @ 50mA, 500mA
DC Current Gain (hFE) Min	100	@ 100mA, 5V
Power - Max	1.35	W
Frequency - Transition	100	MHz
Operating Temperature	150	°C (TJ)
Package / Case	TO-243AA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the BSR43,115 are classified based on electrical parameter compatibility and package equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

Transistor Type: NPN
Maximum Collector Current (Ic): 1 A minimum
Collector-Emitter Breakdown Voltage: 80 V minimum
Package / Case: TO-243AA (SOT-89 family)
Mounting Type: Surface Mount
Vce Saturation: 500 mV @ 50mA, 500mA
Current Collector Cutoff (ICBO): 100 nA maximum
RoHS3 Compliance
MSL Rating: 1 (Unlimited)

Direct Equivalents maintain identical electrical specifications and package designation, enabling pin-for-pin replacement without circuit modification.

Similar Substitutes meet or exceed the critical electrical parameters but may differ in secondary characteristics such as transition frequency, power dissipation rating, or DC current gain specifications. These parts are functionally compatible within the same application class.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) A	Vce(br) V	Vce Sat mV	hFE Min	Power W	Freq MHz	Temp °C	Package
BSR43,115	Nexperia USA Inc.	1	80	500	100	1.35	100	150	SOT-89
2SC3646S-TD-E	onsemi	1	100	400	100	0.5	120	150	PCP
BSR43TA	Diodes Incorporated	1	80	500	100	1	100	-65 to 150	SOT-89-3
BCX56-TP	Micro Commercial Co	1	80	500	63	0.5	130	150	SOT-89
BCX5610TA	Diodes Incorporated	1	80	500	63	1	150	-65 to 150	SOT-89-3
BCX5616QTA	Diodes Incorporated	1	80	500	100	2	150	-65 to 150	SOT-89-3
BCX5616TA	Diodes Incorporated	1	80	500	100	1	150	-65 to 150	SOT-89-3
BCX56TA	Diodes Incorporated	1	80	500	40	1	150	-65 to 150	SOT-89-3
CXT3019 TR PBFREE	Central Semiconductor Corp	1	80	500	100	1.2	100	-65 to 175	SOT-89

Engineering Selection Recommendations

Direct Equivalent (Pin-for-Pin Replacement):

BSR43TA (Diodes Incorporated) provides direct equivalence to the BSR43,115. Both parts share identical electrical specifications including 1 A collector current, 80 V breakdown voltage, 500 mV saturation voltage, and 100 MHz transition frequency. The BSR43TA is RoHS3 compliant with MSL 1 rating and operates across an extended temperature range of -65°C to 150°C. This part is suitable for direct substitution without circuit redesign.

Compatible Substitutes with Enhanced Performance:

BCX5616TA and BCX5616QTA (Diodes Incorporated) meet all critical electrical parameters while offering higher transition frequency (150 MHz) and extended operating temperature range (-65°C to 150°C). BCX5616QTA provides increased power dissipation capability (2 W versus 1.35 W). Both parts are RoHS3 compliant with MSL 1 rating and are functionally compatible in applications where the BSR43,115 is specified.

BCX5610TA (Diodes Incorporated) matches the BSR43,115 in collector current, breakdown voltage, and saturation characteristics. It offers higher transition frequency (150 MHz) and extended temperature range (-65°C to 150°C). RoHS3 compliance and MSL 1 rating are maintained.

Alternative Substitutes:

CXT3019 TR PBFREE (Central Semiconductor Corp) provides equivalent electrical performance with extended operating temperature range (-65°C to 175°C). This part maintains 1 A collector current, 80 V breakdown voltage, and 100 MHz transition frequency. RoHS3 compliance and MSL 1 rating are confirmed.

BCX56-TP (Micro Commercial Co) and BCX56TA (Diodes Incorporated) meet the critical electrical parameters but feature reduced DC current gain (63 and 40 respectively, compared to 100 for the BSR43,115). These parts are suitable for applications where lower current gain is acceptable.

2SC3646S-TD-E (onsemi) operates at 100 V breakdown voltage, exceeding the 80 V specification of the BSR43,115. However, this part uses a PCP package rather than SOT-89, requiring PCB layout modification. Power dissipation is limited to 500 mW. This part is suitable only when package compatibility is not a constraint.

All substitute parts listed maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard surface mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can BSR43TA be used as a direct replacement for BSR43,115?

A: Yes. BSR43TA is a direct equivalent with identical electrical specifications (1 A collector current, 80 V breakdown voltage, 500 mV saturation voltage, 100 MHz transition frequency) and SOT-89-3 package compatibility. No circuit modification is required.

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 indicates a three-lead configuration. Parts specified as SOT-89 or SOT-89-3 are mechanically and electrically compatible on the same PCB footprint.

Q: Are BCX5616TA and BCX5616QTA interchangeable?

A: Both parts share identical electrical specifications and package designation. The primary difference is power dissipation rating: BCX5616QTA is rated for 2 W while BCX5616TA is rated for 1 W. BCX5616QTA can be substituted for BCX5616TA in applications requiring higher power handling. BCX5616TA cannot replace BCX5616QTA in high-power applications.

Q: Why does 2SC3646S-TD-E have a different package designation (PCP)?

A: The 2SC3646S-TD-E uses a PCP (Plastic Chip Carrier) package rather than SOT-89. While electrically compatible, this part requires different PCB footprint and assembly considerations. It is not recommended as a direct substitute unless PCB redesign is acceptable.

Q: What does the extended temperature range (-65°C to 150°C) mean for BCX5610TA and BCX5616TA?

A: These parts operate reliably across a wider temperature spectrum than the BSR43,115 (which is rated to 150°C maximum). The extended lower limit (-65°C) provides operational capability in cold environments. This specification does not affect electrical performance within the standard operating range and does not restrict substitution.

Q: Can I use BCX56-TP or BCX56TA if the DC current gain specification is lower?

A: BCX56-TP and BCX56TA feature DC current gain (hFE) of 63 and 40 respectively, compared to 100 for the BSR43,115. These parts are suitable for applications where the circuit design accommodates lower current gain. If the application requires minimum hFE of 100, these parts are not appropriate substitutes.

Q: Are all listed substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard surface mount assembly and storage requirements.

Q: What is the significance of the 100 nA collector cutoff current (ICBO) specification?

A: ICBO represents leakage current in the reverse-biased collector-base junction. The BSR43,115 specifies 100 nA maximum. CXT3019 TR PBFREE specifies 10 nA, indicating lower leakage. Both values are acceptable for general-purpose switching applications. Lower ICBO values provide improved performance in precision analog circuits.

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