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2SC4081-A-TP Equivalent & Substitute Parts
Part Overview
The 2SC4081-A-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 current of 150 mA, collector-emitter breakdown voltage of 50 V, and transition frequency of 180 MHz, with a maximum power dissipation of 200 mW. The device is packaged in SOT-323 (SC-70) surface mount format and maintains active product status. Equivalent and substitute parts are identified based on matching or exceeding critical electrical parameters while maintaining compatible package configurations and operating characteristics.
Substiute Parts
Key Parameters
| Parameter | 2SC4081-A-TP | Unit |
|---|---|---|
| Transistor Type | NPN | — |
| Current - Collector (Ic) Max | 150 | mA |
| Voltage - Collector Emitter Breakdown (Max) | 50 | V |
| Vce Saturation (Max) @ Ib, Ic | 400 mV @ 5 mA, 50 mA | — |
| Current - Collector Cutoff (Max) | 100 | nA |
| DC Current Gain (hFE) Min @ Ic, Vce | 120 @ 1 mA, 6 V | — |
| Power - Max | 200 | mW |
| Frequency - Transition | 180 | MHz |
| Operating Temperature (TJ) | 150 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | SC-70, SOT-323 | — |
Substitute Part Grouping Explanation
Substitution of the 2SC4081-A-TP is determined by the following critical parameters:
Mandatory Matching Criteria:
- Transistor Type: NPN
- Mounting Type: Surface Mount
- Package / Case: SC-70 or SOT-323 compatible
- Current - Collector (Ic) Max: ≥ 150 mA
- Voltage - Collector Emitter Breakdown (Max): ≥ 50 V
- Power - Max: ≥ 200 mW
Secondary Compatibility Factors:
- Operating Temperature: ≥ 150°C (TJ)
- Frequency - Transition: ≥ 180 MHz (for high-frequency applications)
- DC Current Gain (hFE): Functional equivalence within application context
- Vce Saturation: Comparable switching characteristics
Substitute parts are grouped into two categories:
Category A - Full Electrical Equivalents: Parts meeting or exceeding all mandatory criteria with matching or superior frequency response and power ratings.
Category B - Reduced Performance Substitutes: Parts meeting mandatory current, voltage, and package requirements but with reduced frequency response or power dissipation. These are suitable for applications not requiring the full 180 MHz transition frequency.
Parameter Comparison
| Parameter | 2SC4081-A-TP | 2SC4116-BL,LF | 2SD2351T106W | BC847AW RFG | BC847BW RFG | BC847CW RFG | BC850AW RFG | BC850BW RFG | BC850CW RFG |
|---|---|---|---|---|---|---|---|---|---|
| Transistor Type | NPN | NPN | NPN | NPN | NPN | NPN | NPN | NPN | NPN |
| Current - Collector (Ic) Max (mA) | 150 | 150 | 150 | 100 | 100 | 100 | 100 | 100 | 100 |
| Voltage - Collector Emitter Breakdown (Max) (V) | 50 | 50 | 50 | 45 | 45 | 45 | 45 | 45 | 45 |
| Power - Max (mW) | 200 | 100 | 200 | 200 | 200 | 200 | 200 | 200 | 200 |
| Frequency - Transition (MHz) | 180 | 80 | 250 | 100 | 100 | 100 | 100 | 100 | 100 |
| Operating Temperature (TJ) (°C) | 150 | 125 | 150 | -55 to 150 | -55 to 150 | -55 to 150 | -55 to 150 | -55 to 150 | -55 to 150 |
| DC Current Gain (hFE) Min @ Ic, Vce | 120 @ 1 mA, 6 V | 350 @ 2 mA, 6 V | 820 @ 1 mA, 5 V | 110 @ 2 mA, 5 V | 200 @ 2 mA, 5 V | 420 @ 2 mA, 5 V | 110 @ 2 mA, 5 V | 200 @ 2 mA, 5 V | 420 @ 2 mA, 5 V |
| Vce Saturation (Max) @ Ib, Ic | 400 mV @ 5 mA, 50 mA | 250 mV @ 10 mA, 100 mA | 300 mV @ 5 mA, 50 mA | 600 mV @ 5 mA, 100 mA | 600 mV @ 5 mA, 100 mA | 600 mV @ 5 mA, 100 mA | 600 mV @ 5 mA, 100 mA | 600 mV @ 5 mA, 100 mA | 600 mV @ 5 mA, 100 mA |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | SC-70, SOT-323 | SC-70, SOT-323 | SC-70, SOT-323 | SC-70, SOT-323 | SC-70, SOT-323 | SC-70, SOT-323 | SC-70, SOT-323 | SC-70, SOT-323 | SC-70, SOT-323 |
Engineering Selection Recommendations
Category A - Full Electrical Equivalents:
The 2SD2351T106W (Rohm Semiconductor) is the primary full equivalent. This part exceeds the 2SC4081-A-TP in transition frequency (250 MHz vs. 180 MHz) while maintaining identical maximum collector current (150 mA), collector-emitter breakdown voltage (50 V), and power dissipation (200 mW). The 2SD2351T106W operates at the same maximum junction temperature (150°C) and is RoHS3 compliant with REACH unaffected status. The higher DC current gain (820 @ 1 mA, 5 V) and improved Vce saturation characteristics (300 mV vs. 400 mV) provide superior switching performance. Packaging is UMT3 surface mount, compatible with SOT-323 footprints.
Category B - Reduced Performance Substitutes:
The 2SC4116-BL,LF (Toshiba Semiconductor and Storage) meets the mandatory current and voltage requirements (150 mA, 50 V) but operates at reduced maximum power dissipation (100 mW vs. 200 mW) and lower transition frequency (80 MHz vs. 180 MHz). This part is suitable for low-frequency interface applications where the full 180 MHz bandwidth is not required. Maximum junction temperature is 125°C, which is 25°C lower than the 2SC4081-A-TP. RoHS3 compliance and MSL Level 1 rating are provided.
BC847 and BC850 Series (Taiwan Semiconductor Corporation):
The BC847AW RFG, BC847BW RFG, BC847CW RFG, BC850AW RFG, BC850BW RFG, and BC850CW RFG are reduced-current substitutes. All variants operate at maximum collector current of 100 mA (vs. 150 mA) and collector-emitter breakdown voltage of 45 V (vs. 50 V). These parts are suitable for applications requiring lower current handling and reduced voltage margins. All BC847 and BC850 variants maintain 200 mW power dissipation and 100 MHz transition frequency. Operating temperature range extends from -55°C to 150°C, providing wider temperature coverage than the 2SC4081-A-TP. All variants are RoHS3 compliant with MSL Level 1 rating and REACH unaffected status.
Compliance and Certification:
All substitute parts maintain active product status. The 2SD2351T106W and all BC847/BC850 variants are RoHS3 compliant. The 2SC4116-BL,LF is RoHS3 compliant with MSL Level 1 rating. All parts carry EAR99 ECCN classification. Selection should prioritize parts matching the application's specific current, voltage, and frequency requirements while maintaining compliance with target regulatory standards.
Frequently Asked Questions (FAQ)
Q: Can the BC847 or BC850 series directly replace the 2SC4081-A-TP?
A: The BC847 and BC850 series are partial substitutes with reduced electrical ratings. Maximum collector current is limited to 100 mA (vs. 150 mA), and collector-emitter breakdown voltage is 45 V (vs. 50 V). These parts are suitable only for applications operating within these reduced specifications. Applications requiring the full 150 mA current capability or 50 V voltage rating require the 2SD2351T106W or 2SC4116-BL,LF.
Q: What is the primary advantage of the 2SD2351T106W over the 2SC4081-A-TP?
A: The 2SD2351T106W provides superior transition frequency (250 MHz vs. 180 MHz) and higher DC current gain (820 @ 1 mA, 5 V vs. 120 @ 1 mA, 6 V) while maintaining identical maximum collector current (150 mA), collector-emitter breakdown voltage (50 V), and power dissipation (200 mW). Both parts operate at 150°C maximum junction temperature.
Q: Is the 2SC4116-BL,LF suitable for high-frequency applications?
A: No. The 2SC4116-BL,LF operates at 80 MHz transition frequency, which is significantly lower than the 2SC4081-A-TP (180 MHz). This part is suitable only for low-frequency interface applications. For high-frequency requirements, the 2SD2351T106W is the appropriate substitute.
Q: Are all substitute parts available in the same package as the 2SC4081-A-TP?
A: All substitute parts are available in SC-70 or SOT-323 surface mount packages, which are mechanically and electrically compatible with the 2SC4081-A-TP footprint. The 2SD2351T106W uses UMT3 packaging, which is compatible with SOT-323 land patterns.
Q: What is the impact of reduced power dissipation in the 2SC4116-BL,LF?
A: The 2SC4116-BL,LF is rated for 100 mW maximum power dissipation, compared to 200 mW for the 2SC4081-A-TP. This limits the part to applications with lower power requirements. Thermal management and circuit design must account for this reduced power budget.
Q: Do all substitute parts meet RoHS3 compliance?
A: Yes. The 2SD2351T106W, 2SC4116-BL,LF, and all BC847/BC850 variants are RoHS3 compliant. All parts carry EAR99 ECCN classification.
Q: What is the difference between BC847 and BC850 variants?
A: BC847 and BC850 series differ primarily in DC current gain specifications. BC847AW RFG and BC850AW RFG both specify 110 hFE @ 2 mA, 5 V. BC847BW RFG and BC850BW RFG both specify 200 hFE @ 2 mA, 5 V. BC847CW RFG and BC850CW RFG both specify 420 hFE @ 2 mA, 5 V. All other electrical parameters are identical within each pair.
Q: Can the 2SC4081-A-TP be used in applications designed for BC847 or BC850 parts?
A: Yes. The 2SC4081-A-TP exceeds the electrical specifications of BC847 and BC850 variants in collector current (150 mA vs. 100 mA), collector-emitter breakdown voltage (50 V vs. 45 V), and transition frequency (180 MHz vs. 100 MHz). The 2SC4081-A-TP is a superior substitute for BC847 and BC850 applications.
Q: What is the operating temperature range difference between substitutes?
A: The 2SC4081-A-TP and 2SD2351T106W both operate to 150°C maximum junction temperature. The 2SC4116-BL,LF operates to 125°C maximum. The BC847 and BC850 series operate from -55°C to 150°C, providing the widest temperature range. Application requirements determine the appropriate temperature specification.
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