Equivalent & Substitute Parts for 2SC4081-B-TP

Part Overview

The 2SC4081-B-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for interface applications in surface mount configurations. This transistor operates at a maximum collector voltage of 50 V with a collector current rating of 150 mA and a transition frequency of 180 MHz. The device is packaged in SOT-323 (SC-70) format and dissipates a maximum of 200 mW. The part maintains active product status with 6200 units in current inventory.

Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility. Substitutes must maintain compatibility with the SOT-323 surface mount package and satisfy the functional requirements of NPN transistor operation within specified voltage and current parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	150	mA
Power - Max	200	mW
Frequency - Transition	180	MHz
Mounting Type	Surface Mount	—
Package / Case	SOT-323, SC-70	—
Operating Temperature (Max)	150	°C

Substitute Part Grouping Explanation

Substitute parts for the 2SC4081-B-TP are classified based on electrical parameter compatibility and mechanical interchangeability. The primary substitution criteria are:

Electrical Compatibility Parameters:

Transistor type (NPN)
Collector-emitter breakdown voltage rating
Maximum collector current rating
Power dissipation capability
Transition frequency
DC current gain characteristics

Mechanical Compatibility Parameters:

Surface mount packaging format (SOT-323 / SC-70)
Pin configuration and lead frame design

Substitute parts are grouped into two categories:

Category 1: Full Electrical Equivalents — Parts with collector voltage ratings of 50 V and collector current ratings of 150 mA, maintaining the same power dissipation and frequency characteristics as the main part.

Category 2: Reduced-Rating Substitutes — Parts with collector voltage ratings of 45 V and collector current ratings of 100 mA, suitable for applications where the full electrical specifications of the main part are not required. These parts maintain surface mount compatibility and similar frequency performance.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce Breakdown (Max) V	Power (Max) mW	Frequency (Transition) MHz	Package	hFE (Min) @ Ic, Vce	Product Status
2SC4081-B-TP	Micro Commercial Co	150	50	200	180	SOT-323	120 @ 1mA, 6V	Active
2SC4116-Y,LF	Toshiba Semiconductor and Storage	150	50	100	80	SC-70	120 @ 2mA, 6V	Active
BC847AW RFG	Taiwan Semiconductor Corporation	100	45	200	100	SOT-323	110 @ 2mA, 5V	Active
BC847BW RFG	Taiwan Semiconductor Corporation	100	45	200	100	SOT-323	200 @ 2mA, 5V	Active
BC847CW RFG	Taiwan Semiconductor Corporation	100	45	200	100	SOT-323	420 @ 2mA, 5V	Active
BC850AW RFG	Taiwan Semiconductor Corporation	100	45	200	100	SOT-323	110 @ 2mA, 5V	Active
BC850BW RFG	Taiwan Semiconductor Corporation	100	45	200	100	SOT-323	200 @ 2mA, 5V	Active
BC850CW RFG	Taiwan Semiconductor Corporation	100	45	200	100	SOT-323	420 @ 2mA, 5V	Active

Engineering Selection Recommendations

2SC4116-Y,LF (Toshiba Semiconductor and Storage)

This part maintains the 50 V collector-emitter breakdown voltage and 150 mA collector current rating of the main part, providing electrical equivalence for voltage and current specifications. The transition frequency of 80 MHz is lower than the main part's 180 MHz. Power dissipation is rated at 100 mW, which is half that of the main part. This part is ROHS3 compliant with MSL rating of 1 (Unlimited) and carries active product status. Selection of this part is appropriate for applications where the reduced frequency and power ratings are acceptable.

BC847AW RFG, BC847BW RFG, BC847CW RFG (Taiwan Semiconductor Corporation)

These parts are rated for 45 V collector-emitter breakdown voltage and 100 mA maximum collector current, representing reduced electrical specifications compared to the main part. All three variants maintain 200 mW power dissipation and 100 MHz transition frequency. The variants differ in DC current gain: BC847AW RFG provides 110 hFE (Min), BC847BW RFG provides 200 hFE (Min), and BC847CW RFG provides 420 hFE (Min). All are ROHS3 compliant with MSL rating of 1 (Unlimited) and carry active product status. These parts are suitable for applications operating within the reduced voltage and current parameters.

BC850AW RFG, BC850BW RFG, BC850CW RFG (Taiwan Semiconductor Corporation)

These parts are rated for 45 V collector-emitter breakdown voltage and 100 mA maximum collector current. All three variants maintain 200 mW power dissipation and 100 MHz transition frequency. The variants differ in DC current gain: BC850AW RFG provides 110 hFE (Min), BC850BW RFG provides 200 hFE (Min), and BC850CW RFG provides 420 hFE (Min). All are ROHS3 compliant with MSL rating of 1 (Unlimited) and carry active product status. These parts are suitable for applications operating within the reduced voltage and current parameters.

All substitute parts maintain surface mount compatibility through SOT-323 packaging and are classified as active products with current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the 2SC4116-Y,LF directly replace the 2SC4081-B-TP in all applications?

A: The 2SC4116-Y,LF maintains the same collector voltage (50 V) and collector current (150 mA) ratings as the 2SC4081-B-TP. However, the transition frequency is reduced from 180 MHz to 80 MHz, and power dissipation is reduced from 200 mW to 100 mW. Direct substitution is appropriate only for applications where these reduced specifications are acceptable.

Q: What is the difference between BC847 and BC850 series transistors?

A: Both BC847 and BC850 series are NPN transistors in SOT-323 packaging with identical electrical ratings of 45 V collector-emitter breakdown voltage, 100 mA maximum collector current, 200 mW power dissipation, and 100 MHz transition frequency. The primary distinction lies in DC current gain specifications, with variants designated A, B, and C providing different hFE (Min) values.

Q: Are the BC847 and BC850 variants (A, B, C) interchangeable?

A: The BC847 and BC850 variants differ in their minimum DC current gain specifications. BC847AW RFG and BC850AW RFG both provide 110 hFE (Min), BC847BW RFG and BC850BW RFG both provide 200 hFE (Min), and BC847CW RFG and BC850CW RFG both provide 420 hFE (Min). Selection between variants depends on the specific DC current gain requirement of the application.

Q: Can I use a substitute part rated for 45 V in an application designed for 50 V operation?

A: Substitution of a 45 V rated part in a 50 V application is not appropriate. The collector-emitter breakdown voltage rating must meet or exceed the maximum voltage present in the application circuit. Use of an undersized voltage rating creates risk of device failure.

Q: What is the significance of the SOT-323 and SC-70 package designations?

A: SOT-323 and SC-70 are equivalent package designations for the same surface mount transistor package format. Both refer to a six-pin small outline transistor package with identical pin configuration and mechanical dimensions. Parts specified with either designation are mechanically interchangeable.

Q: Are all substitute parts RoHS3 compliant?

A: The 2SC4081-B-TP does not specify RoHS status in the provided data. All substitute parts listed (2SC4116-Y,LF, BC847 series, and BC850 series) are confirmed as ROHS3 compliant. Compliance verification should be confirmed against specific application requirements.

Q: What does MSL rating of 1 (Unlimited) indicate?

A: Moisture Sensitivity Level (MSL) rating of 1 (Unlimited) indicates that the component has unlimited shelf life and does not require special moisture control measures during storage or handling. This represents the lowest moisture sensitivity classification.

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