MSC3930-BT1 Equivalent & Substitute Parts

Part Overview

The MSC3930-BT1 is an RF transistor NPN manufactured by onsemi, rated for 20V collector-emitter breakdown voltage with a transition frequency of 150MHz and maximum power dissipation of 200mW. The device is housed in a Surface Mount SC-70 (SOT-323) package and is classified as obsolete. Due to its obsolete product status, equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	20	V
Frequency - Transition	150	MHz
Power - Max	200	mW
Current - Collector (Ic) (Max)	30	mA
DC Current Gain (hFE) (Min) @ Ic, Vce	70 @ 1mA, 10V	—
Operating Temperature (Max)	150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-70, SOT-323	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the MSC3930-BT1 is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (required match)
Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 20V
Frequency - Transition: Must equal or exceed 150MHz
Power - Max: Must equal or exceed 200mW
Current - Collector (Ic) (Max): Must equal or exceed 30mA
Operating Temperature: Must support 150°C maximum junction temperature
Mounting Type: Surface Mount (required match)

The substitute parts listed below meet these electrical and thermal requirements. Packaging differences are noted where they occur, as physical form factor may require PCB layout modifications.

Parameter Comparison

Parameter	MSC3930-BT1	2SC5087R(TE85L,F)	BFP181E7764HTSA1	BFP540FESDH6327XTSA1	MAX2601ESA+	MMBTH10-TP
Manufacturer	onsemi	Toshiba Semiconductor and Storage	Infineon Technologies	Infineon Technologies	Analog Devices Inc./Maxim Integrated	Micro Commercial Co
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	20V	12V	12V	5V	15V	25V
Frequency - Transition	150MHz	8GHz	8GHz	30GHz	1GHz	650MHz
Power - Max	200mW	150mW	175mW	250mW	6.4W	225mW
Current - Collector (Ic) (Max)	30mA	80mA	20mA	80mA	1.2A	50mA
DC Current Gain (hFE) (Min) @ Ic, Vce	70 @ 1mA, 10V	120 @ 20mA, 10V	70 @ 70mA, 8V	50 @ 20mA, 3.5V	100 @ 250mA, 3V	60 @ 4mA, 10V
Operating Temperature (Max)	150°C	125°C	150°C	150°C	150°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SC-70, SOT-323	SC-61AA	TO-253-4, TO-253AA	4-SMD, Flat Leads	8-SOIC (0.154", 3.90mm Width) Exposed Pad	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MSC3930-BT1 Substitution Analysis:

The MSC3930-BT1 is obsolete and no longer manufactured. Selection of a substitute part must account for both electrical performance requirements and compliance status.

2SC5087R(TE85L,F) — This Toshiba device operates at a lower maximum voltage (12V versus 20V) and lower maximum operating temperature (125°C versus 150°C). It does not meet the thermal requirement for 150°C operation. This part is not suitable as a direct substitute.

BFP181E7764HTSA1 — This Infineon device meets the voltage requirement (12V is below 20V specification) and operates at the required 150°C maximum temperature. However, the maximum collector current is 20mA, which is below the 30mA requirement of the MSC3930-BT1. This part does not meet the current specification and is not suitable as a direct substitute.

BFP540FESDH6327XTSA1 — This Infineon device operates at 5V maximum voltage, which is significantly below the 20V requirement. This part does not meet the voltage specification and is not suitable as a direct substitute.

MAX2601ESA+ — This Analog Devices/Maxim device operates at 15V maximum voltage, which is below the 20V requirement. However, it provides significantly higher power dissipation (6.4W versus 200mW) and higher collector current (1.2A versus 30mA). The device is RoHS3 compliant and operates at 150°C maximum temperature. This part does not meet the voltage specification and is not suitable as a direct substitute.

MMBTH10-TP — This Micro Commercial Co device operates at 25V maximum voltage, which exceeds the 20V requirement. It provides 225mW power dissipation (exceeding 200mW) and 50mA maximum collector current (exceeding 30mA). The device is RoHS3 compliant and operates at 150°C maximum temperature. The package is SOT-23, which differs from the SC-70 (SOT-323) of the original part. This part meets all electrical specifications but requires PCB layout modification due to package differences.

Frequently Asked Questions (FAQ)

Q: Can the MSC3930-BT1 be directly replaced with any of the listed substitute parts?

A: No substitute part meets all electrical specifications of the MSC3930-BT1 without compromise. The MMBTH10-TP comes closest, meeting voltage, current, and power requirements, but uses a different package (SOT-23 versus SC-70/SOT-323), requiring PCB layout modification.

Q: Why do some substitute parts have lower voltage ratings than the MSC3930-BT1?

A: The 2SC5087R(TE85L,F), BFP181E7764HTSA1, and BFP540FESDH6327XTSA1 are designed for higher frequency applications (8GHz and 30GHz respectively) and operate at lower voltages. These parts are not suitable substitutes for the MSC3930-BT1 due to voltage specification mismatch.

Q: What is the significance of the operating temperature difference in the 2SC5087R(TE85L,F)?

A: The 2SC5087R(TE85L,F) has a maximum operating temperature of 125°C, while the MSC3930-BT1 is rated to 150°C. This 25°C difference means the Toshiba device cannot be used in applications requiring the full thermal range of the original part.

Q: Does RoHS compliance affect substitution decisions?

A: The MSC3930-BT1 is RoHS non-compliant. All listed substitute parts are RoHS3 compliant. If RoHS compliance is required for the application, any active substitute part will satisfy this requirement. If legacy RoHS non-compliant designs must be maintained, this constraint eliminates all listed substitutes.

Q: Why is the MAX2601ESA+ not a suitable substitute despite meeting temperature requirements?

A: The MAX2601ESA+ operates at a maximum voltage of 15V, which is below the 20V specification of the MSC3930-BT1. While it provides superior power handling and current capacity, it does not meet the voltage requirement and is not suitable for applications requiring 20V operation.

Q: What package considerations apply to the MMBTH10-TP?

A: The MMBTH10-TP uses a SOT-23 package, while the MSC3930-BT1 uses SC-70 (SOT-323). These packages have different pin configurations and physical dimensions. PCB layout and schematic modifications are required to accommodate this package change.

Q: Are there any substitute parts that fully meet all electrical specifications of the MSC3930-BT1?

A: No. The MMBTH10-TP exceeds the voltage requirement (25V versus 20V) and meets current and power requirements, but uses a different package. All other listed parts fail to meet one or more critical electrical specifications.

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