BSP31,115 Equivalent & Substitute Parts

Part Overview

The BSP31,115 is a PNP bipolar junction transistor manufactured by Nexperia USA Inc., rated for 60 V collector-emitter breakdown voltage and 1 A maximum collector current. The device is housed in a SOT-223 surface mount package and is qualified to AEC-Q100 automotive standards. This transistor is currently in active product status with 1021 units in stock.

Substitute parts are necessary when the primary device becomes unavailable, when alternative packaging formats are required, or when design specifications allow for components with enhanced electrical characteristics within the same functional category. The following equivalent devices maintain compatibility with the BSP31,115 across critical electrical and mechanical parameters.

Key Parameters

Parameter	BSP31,115 Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	1	A
Voltage - Collector Emitter Breakdown (Max)	60	V
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	—
Current - Collector Cutoff (Max)	100nA	—
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 100mA, 5V	—
Power - Max	1.3	W
Frequency - Transition	100	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
Supplier Device Package	SOT-223	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the BSP31,115 are grouped based on electrical parameter compatibility within the PNP bipolar transistor category. The critical parameters determining substitution eligibility are:

Primary Compatibility Criteria:

Transistor Type: PNP
Voltage - Collector Emitter Breakdown: 60 V minimum (higher ratings acceptable)
Current - Collector (Ic) Max: 1 A minimum (higher ratings acceptable)
Vce Saturation: 500mV or lower @ specified test conditions
Current - Collector Cutoff: 100nA or lower
DC Current Gain (hFE): 100 minimum or higher
Mounting Type: Surface Mount
Package / Case: TO-261-4 or TO-261AA compatible
Supplier Device Package: SOT-223 or SOT-223-3 compatible

Secondary Compatibility Criteria:

Operating Temperature: 150°C or higher
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts may exceed the BSP31,115 specifications in power dissipation, transition frequency, or collector current rating without compromising circuit functionality, provided all minimum electrical requirements are met.

Parameter Comparison

Part Number	Manufacturer	Ic Max (A)	Vce Breakdown (V)	Power Max (W)	Frequency (MHz)	hFE Min @ Ic, Vce	Package	Product Status
BSP31,115	Nexperia USA Inc.	1	60	1.3	100	100 @ 100mA, 5V	SOT-223	Active
BCP5216H6327XTSA1	Infineon Technologies	1	60	2	125	100 @ 150mA, 2V	PG-SOT223-4-10	Last Time Buy
BCP52TA	Diodes Incorporated	1	60	2	125	40 @ 150mA, 2V	SOT-223-3	Active
CZT4033 TR PBFREE	Central Semiconductor Corp	1	80	2	100	100 @ 100mA, 5V	SOT-223	Active
DSS60600MZ4-13	Diodes Incorporated	6	60	1.2	100	120 @ 1A, 2V	SOT-223-3	Active
FZT591TA	Diodes Incorporated	1	60	2	150	100 @ 500mA, 5V	SOT-223-3	Active
FZT751QTA	Diodes Incorporated	3	60	3	140	100 @ 500mA, 2V	SOT-223-3	Active
FZT751QTC	Diodes Incorporated	3	60	2	140	100 @ 500mA, 2V	SOT-223-3	Active
FZT751TA	Diodes Incorporated	3	60	2	140	100 @ 500mA, 2V	SOT-223-3	Active
FZT751TC	Diodes Incorporated	3	60	2	140	100 @ 500mA, 2V	SOT-223-3	Active
FZT792ATA	Diodes Incorporated	2	70	2	160	300 @ 10mA, 2V	SOT-223-3	Active

Engineering Selection Recommendations

Direct Substitutes (Equivalent Electrical Performance):

The FZT591TA and FZT751 series (FZT751QTA, FZT751QTC, FZT751TA, FZT751TC) are direct functional equivalents to the BSP31,115. These devices maintain the 60 V collector-emitter breakdown voltage, meet or exceed the 1 A collector current requirement, and provide equivalent or superior DC current gain characteristics. All are in active product status with ROHS3 compliance and unlimited moisture sensitivity rating. The FZT751 variants offer higher collector current ratings (3 A) and enhanced transition frequency (140 MHz), providing design margin for applications requiring higher performance.

Automotive-Grade Alternative:

The FZT751QTC is qualified to AEC-Q101 automotive standards, matching the automotive-grade qualification of the BSP31,115 (AEC-Q100). This device is suitable for applications requiring automotive-level reliability and traceability.

Higher Voltage Rating Option:

The CZT4033 TR PBFREE provides an 80 V collector-emitter breakdown voltage rating while maintaining 1 A collector current and equivalent DC current gain (100 @ 100mA, 5V). This device is appropriate for applications requiring enhanced voltage margin.

Higher Current Capability:

The DSS60600MZ4-13 and FZT792ATA provide enhanced current handling (6 A and 2 A respectively) while maintaining 60 V or higher voltage ratings. These devices are suitable for applications requiring higher collector current than the 1 A specification.

Avoid:

The BCP5216H6327XTSA1 is designated as Last Time Buy and should not be selected for new designs requiring long-term component availability.

Frequently Asked Questions (FAQ)

Q: Can the FZT751TA replace the BSP31,115 in all applications?

A: The FZT751TA meets all electrical compatibility criteria for the BSP31,115. It provides equivalent 60 V breakdown voltage, exceeds the 1 A collector current requirement with a 3 A rating, and maintains equivalent DC current gain. The primary difference is packaging format (Cut Tape & Digi-Reel vs. Tape & Reel) and higher transition frequency (140 MHz vs. 100 MHz). Verify packaging requirements for your assembly process.

Q: What is the difference between SOT-223 and SOT-223-3 packages?

A: Both packages are mechanically compatible with the TO-261-4 and TO-261AA case designations. SOT-223-3 is a three-lead variant, while SOT-223 may reference the standard four-lead configuration. Consult device datasheets and PCB layout requirements to confirm pin compatibility for your specific application.

Q: Is the BCP52TA suitable as a substitute despite lower hFE minimum (40 vs. 100)?

A: The BCP52TA has a lower DC current gain minimum specification (40 @ 150mA, 2V) compared to the BSP31,115 (100 @ 100mA, 5V). While it meets voltage and current requirements, applications sensitive to current gain performance should verify circuit operation with the lower hFE value. This device is in active product status with high inventory availability (28,200 units).

Q: Why do some substitute parts have higher power ratings than the BSP31,115?

A: Higher power ratings (2 W vs. 1.3 W) indicate enhanced thermal performance and current handling capability. These devices remain compatible with the BSP31,115 in applications operating within the original 1.3 W power budget. Higher power ratings provide design margin for thermal management and do not compromise circuit functionality.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the environmental and regulatory compliance of the BSP31,115.

Q: Which substitute offers the best performance for high-frequency applications?

A: The FZT792ATA provides the highest transition frequency (160 MHz) among the listed substitutes. However, the FZT751 series (140 MHz) and FZT591TA (150 MHz) also exceed the BSP31,115 specification (100 MHz) and are suitable for applications requiring enhanced frequency response.

Q: Can I use the DSS60600MZ4-13 in place of the BSP31,115?

A: The DSS60600MZ4-13 is electrically compatible with the BSP31,115 for voltage and package requirements. However, it is rated for 6 A collector current, significantly exceeding the 1 A specification. This device is appropriate only for applications requiring higher current capability. For circuits designed for 1 A operation, the DSS60600MZ4-13 introduces unnecessary cost and thermal considerations.

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