Equivalent & Substitute Parts for 2PC4081Q,115

Part Overview

The 2PC4081Q,115 is an NPN bipolar junction transistor manufactured by Nexperia USA Inc., designed for surface mount applications in the SOT-323 package. This transistor operates at a maximum collector voltage of 50 V with a collector current rating of 150 mA and a maximum power dissipation of 200 mW. The device is qualified to AEC-Q101 automotive standards and carries Active product status, indicating continued availability and suitability for new designs.

Equivalent and substitute parts are identified when alternative components meet or exceed the electrical and mechanical specifications of the primary part, enabling design flexibility, supply chain optimization, and component availability management. The parts listed below satisfy the core functional requirements of the 2PC4081Q,115 while maintaining compatibility with existing circuit designs.

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	100	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 1mA, 6V	—
Vce Saturation (Max) @ Ib, Ic	400mV @ 5mA, 50mA	—
Current - Collector Cutoff (Max)	100	nA
Operating Temperature (Max)	150	°C
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the 2PC4081Q,115 are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes meet all critical electrical parameters including collector voltage rating (50 V), collector current rating (150 mA), power dissipation (200 mW), and package form factor (SOT-323). These parts are functionally interchangeable within the same circuit topology.

Similar Substitutes satisfy the core functional requirements but differ in one or more secondary parameters. These parts are suitable for applications where the specific parameter variance does not impact circuit performance.

The following parameters determine substitution eligibility:

Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 50 V
Current - Collector (Ic) (Max): Must equal or exceed 150 mA
Power - Max: Must equal or exceed 200 mW
Package / Case: Must be SC-70 or SOT-323
Mounting Type: Must be Surface Mount
Transistor Type: Must be NPN

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce Breakdown (Max) V	Power (Max) mW	Frequency (Transition) MHz	hFE (Min) @ Ic, Vce	Package	Product Status
2PC4081Q,115	Nexperia USA Inc.	150	50	200	100	120 @ 1mA, 6V	SOT-323	Active
2SC4081T106Q	Rohm Semiconductor	150	50	200	180	120 @ 1mA, 6V	SOT-323	Not For New Designs
2SC4081T106S	Rohm Semiconductor	150	50	200	180	120 @ 1mA, 6V	SOT-323	Not For New Designs
2SC4081T106R	Rohm Semiconductor	150	50	200	180	180 @ 1mA, 6V	SOT-323	Not For New Designs
BC847AW RFG	Taiwan Semiconductor Corporation	100	45	200	100	110 @ 2mA, 5V	SOT-323	Active
BC847BW RFG	Taiwan Semiconductor Corporation	100	45	200	100	200 @ 2mA, 5V	SOT-323	Active
BC847CW RFG	Taiwan Semiconductor Corporation	100	45	200	100	420 @ 2mA, 5V	SOT-323	Active
BC850AW RFG	Taiwan Semiconductor Corporation	100	45	200	100	110 @ 2mA, 5V	SOT-323	Active
BC850BW RFG	Taiwan Semiconductor Corporation	100	45	200	100	200 @ 2mA, 5V	SOT-323	Active
BC850CW RFG	Taiwan Semiconductor Corporation	100	45	200	100	420 @ 2mA, 5V	SOT-323	Active
MSD1819A-RT1G	onsemi	100	50	150	—	210 @ 2mA, 10V	SOT-323	Active

Engineering Selection Recommendations

Direct Substitutes (Rohm Semiconductor 2SC4081 Series)

The 2SC4081T106Q, 2SC4081T106S, and 2SC4081T106R parts from Rohm Semiconductor satisfy all electrical and mechanical requirements of the 2PC4081Q,115. These devices maintain the 50 V collector-emitter breakdown voltage, 150 mA collector current rating, and 200 mW power dissipation. All three parts are packaged in SOT-323 and support surface mount assembly.

However, these parts carry a "Not For New Designs" product status designation. This status indicates that while the parts remain available and functional, the manufacturer does not recommend their use in new circuit designs. For applications requiring long-term supply assurance and design continuity, the 2PC4081Q,115 (Active status) remains the preferred primary selection.

Similar Substitutes (Taiwan Semiconductor Corporation BC847 and BC850 Series)

The BC847AW RFG, BC847BW RFG, BC847CW RFG, BC850AW RFG, BC850BW RFG, and BC850CW RFG parts from Taiwan Semiconductor Corporation are Active status devices with SOT-323 packaging. These transistors operate at a reduced collector voltage rating of 45 V and reduced collector current rating of 100 mA compared to the 2PC4081Q,115.

These parts are suitable for applications where the circuit design operates below 45 V collector-emitter voltage and requires collector currents not exceeding 100 mA. The BC847 and BC850 series offer multiple hFE grades (A, B, C variants) to support different gain requirements. All variants maintain 200 mW power dissipation and 100 MHz transition frequency.

Similar Substitute (onsemi MSD1819A-RT1G)

The MSD1819A-RT1G from onsemi meets the 50 V collector-emitter breakdown voltage requirement and maintains SOT-323 packaging. However, this device is rated for 100 mA maximum collector current and 150 mW maximum power dissipation, both lower than the 2PC4081Q,115 specifications. The MSD1819A-RT1G is suitable for applications requiring 50 V operation with collector currents limited to 100 mA and power dissipation not exceeding 150 mW.

Compliance and Certification

All listed substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) ratings, consistent with the primary part. The 2PC4081Q,115 carries AEC-Q101 automotive qualification; substitute parts should be evaluated for automotive qualification requirements in specific applications.

Frequently Asked Questions (FAQ)

Q: Can the 2SC4081T106Q, 2SC4081T106S, or 2SC4081T106R be used as direct replacements for the 2PC4081Q,115?

A: These Rohm Semiconductor parts satisfy all electrical and mechanical specifications of the 2PC4081Q,115, including 50 V collector-emitter breakdown voltage, 150 mA collector current, 200 mW power dissipation, and SOT-323 packaging. However, these parts carry "Not For New Designs" status. For new circuit designs, the 2PC4081Q,115 (Active status) is the recommended primary selection. For existing designs or applications where supply continuity is not critical, the 2SC4081 series provides functional equivalence.

Q: Why do the BC847 and BC850 series parts have lower collector current and voltage ratings than the 2PC4081Q,115?

A: The BC847 and BC850 series are rated for 45 V collector-emitter breakdown voltage and 100 mA maximum collector current, compared to 50 V and 150 mA for the 2PC4081Q,115. These differences reflect the design specifications of each device family. The BC847 and BC850 series are suitable for applications operating within their specified limits but are not direct substitutes for circuits requiring the full 50 V and 150 mA capabilities of the 2PC4081Q,115.

Q: What is the significance of the hFE grade variants (A, B, C) in the BC847 and BC850 series?

A: The hFE grade designations indicate different minimum DC current gain specifications. BC847AW RFG and BC850AW RFG specify 110 minimum hFE @ 2mA, 5V. BC847BW RFG and BC850BW RFG specify 200 minimum hFE @ 2mA, 5V. BC847CW RFG and BC850CW RFG specify 420 minimum hFE @ 2mA, 5V. Selection of the appropriate grade depends on the circuit's gain requirements and biasing configuration.

Q: Is the MSD1819A-RT1G suitable for all applications using the 2PC4081Q,115?

A: The MSD1819A-RT1G maintains the 50 V collector-emitter breakdown voltage of the 2PC4081Q,115 but is limited to 100 mA collector current and 150 mW power dissipation. This device is suitable only for applications where collector current does not exceed 100 mA and power dissipation remains below 150 mW. Applications requiring the full 150 mA current capability or 200 mW power dissipation of the 2PC4081Q,115 cannot use the MSD1819A-RT1G.

Q: Are all substitute parts RoHS3 compliant and MSL 1 rated?

A: Yes. All substitute parts listed maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) ratings, consistent with the 2PC4081Q,115. These compliance attributes ensure compatibility with standard manufacturing processes and storage requirements.

Q: What is the difference between the Nexperia 2PC4081Q,115 and the Rohm 2SC4081T106 series in terms of transition frequency?

A: The 2PC4081Q,115 specifies 100 MHz transition frequency. The 2SC4081T106Q, 2SC4081T106S, and 2SC4081T106R parts specify 180 MHz transition frequency. The higher transition frequency of the Rohm devices provides improved high-frequency performance but does not prevent their use in applications designed for 100 MHz operation.

Q: Can the BC847 or BC850 series be used in automotive applications requiring AEC-Q101 qualification?

A: The BC847 and BC850 series parts provided in this reference do not carry explicit AEC-Q101 qualification designation in the supplied data. Applications requiring automotive qualification should confirm that substitute parts meet the specific AEC-Q101 requirements of the design before implementation.

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