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onsemi BC547CNMBU
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- Part No.:
- BC547CNMBU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
BC547CNMBU.pdf
- Description:
- TRANS NPN 45V 0.1A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,757
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Product details
Overview
BC547CNMBU from ON Semiconductor is an NPN epitaxial silicon transistor in TO-92 package, rated for 45 V VCEO, 100 mA IC, and 500 mW PC, with hFE range 420–800 (Class C), used in general-purpose amplification and low-speed switching circuits in consumer electronics and industrial control interfaces.
For engineers reviewing the BC547CNMBU datasheet, pinout, applications, or equivalent options, key selection considerations include DC current gain classification, VCEO rating, saturation voltage at defined IC/IB, noise figure, and TO-92 mechanical compatibility in space-constrained PCB layouts.
Technical Context
This device operates as a discrete bipolar junction transistor with fixed emitter-base and collector-base junction geometry, optimized for linear amplification and saturated switching. Its hFE classification (C) ensures consistent gain behavior across production lots when biased at VCE = 5 V and IC = 2 mA.
Thermal performance is defined by a 150 °C maximum junction temperature and 500 mW power dissipation limit at TA = 25 °C, requiring derating above ambient. The 3.5–6.0 pF Cob and 9 pF Cib values support stable operation up to ~300 MHz fT under specified test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration. |
| IC (DC) | 100 mA - Continuous collector current limit defining usable output drive capability. |
| hFE (Class C) | 420–800 - Guaranteed DC current gain range at VCE = 5 V, IC = 2 mA, enabling predictable biasing in amplifier stages. |
| VCE(sat) | 250–600 mV - Voltage drop across collector-emitter when fully saturated at IC = 100 mA, IB = 5 mA, critical for low-loss switching. |
| fT | 300 MHz - Current gain–bandwidth product indicating usable frequency limit for small-signal amplification. |
| NF (BC547) | 2.0–10.0 dB - Noise figure at VCE = 5 V, IC = 200 μA, f = 1 kHz, RG = 2 kΩ, relevant for low-noise preamp design. |
| PC | 500 mW - Maximum power dissipation at 25 °C ambient, requiring thermal derating above that temperature. |
Pinout & Package
BC547CNMBU uses the standard TO-92 3-lead plastic package with straight leads (JEDEC TO-92 compliant). Pin 1 is Collector, Pin 2 is Base, Pin 3 is Emitter - verified per Fairchild/ON Semiconductor physical dimensions documentation and industry-standard TO-92 orientation diagrams.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Collector) | Output current terminal | Primary current sink node; connects to load or next stage input; voltage swing limited by VCEO rating. |
| 2 (Base) | Control input terminal | Current-driven gate for transistor conduction; requires external bias network to set operating point. |
| 3 (Emitter) | Reference current terminal | Common return path; often tied to ground or emitter resistor for stabilization in amplifier configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Switching & Amplifier Dual Use | Validated by VCE(sat) ≤ 600 mV at IC = 100 mA and hFE ≥ 420, supporting both saturated digital logic interfacing and analog signal gain. |
| TO-92 Mechanical Standardization | Enables drop-in replacement across BC546–BC550 family variants and legacy designs using JEDEC-compliant through-hole mounting. |
| Low-Noise Option (BC547 Class) | 2.0–10.0 dB noise figure at 1 kHz enables use in audio preamplifiers and sensor front-ends where signal integrity is critical. |
| Complementary Pair Availability | Direct pairing with BC557 (PNP) allows balanced differential amplifier and push-pull output stage implementation. |
Applications
| Audio Pre-Amplifier Stage | Microcontroller GPIO Interface |
|---|---|
|
Use Scenario: Boosting weak signals from electret microphones or piezoelectric sensors before ADC sampling. IC Role / Device Role / Timing Role: Small-signal NPN amplifier configured in common-emitter topology with emitter degeneration. Use Value: 420–800 hFE and 2.0–10.0 dB noise figure ensure high SNR amplification without added distortion in battery-powered portable devices. |
Use Scenario: Level-shifting and current boosting between 3.3 V microcontroller outputs and 5 V relay coils or LED arrays. IC Role / Device Role / Timing Role: Saturated switch controlled by MCU GPIO, operating in cutoff/saturation regions. Use Value: VCE(sat) ≤ 600 mV at IC = 100 mA minimizes power loss and heat generation during sustained on-state operation. |
| Industrial Sensor Signal Conditioning | Legacy Equipment Repair & Replacement |
|
Use Scenario: Linear amplification of millivolt-level thermocouple or strain gauge outputs in PLC analog input modules. IC Role / Device Role / Timing Role: DC-coupled amplifier with stable bias point set via base divider and emitter resistor. Use Value: 45 V VCEO and 150 °C TJ rating allow reliable operation in electrically noisy, high-temperature industrial enclosures. |
Use Scenario: Direct replacement for obsolete BC547 variants in decades-old test equipment, power supplies, and telecom hardware. IC Role / Device Role / Timing Role: Drop-in functional and mechanical substitute preserving original schematic and layout. Use Value: Identical TO-92 footprint, pinout (C-B-E), and electrical specifications enable zero-modification field repair with full traceability via ON Semiconductor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC547C (Digi-Key: BC547CTA-ND) | Same hFE class (C), identical VCEO/IC/PC, but supplied in ammo pack instead of bulk; no electrical difference. | No functional change; differs only in packaging format for automated assembly vs. manual prototyping. | Select BC547CNMBU for hand-soldered evaluation or low-volume repair; choose BC547CTA for reel-fed SMT line compatibility. |
| PN2222A (ON Semi: PN2222ATFR) | Higher VCEO (40 V → 60 V), higher IC (600 mA), wider hFE spread (100–300), TO-92 compatible but not pin-identical (E-B-C vs. C-B-E). | Requires PCB layout revision due to reversed emitter-collector pinout; suitable for higher-current switching where gain consistency is secondary. | Use PN2222ATFR only when BC547CNMBU's 100 mA limit is insufficient and pinout redesign is acceptable. |
Compared with BC547C and PN2222A, BC547CNMBU offers guaranteed Class C hFE consistency and exact legacy pinout compliance-critical for repair, calibration, and low-noise analog reuse without layout or bias recalibration.
Availability
BC547CNMBU is available at Aetrix Electronics and suitable for audio pre-amplifier stages, microcontroller GPIO interface circuits, and industrial sensor signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for BC547CNMBU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
ON Semiconductor (formerly Fairchild Semiconductor) is a global supplier of energy-efficient semiconductor components, specializing in power management, analog, and discrete devices for automotive, industrial, and consumer markets.
The BC547CNMBU belongs to ON Semiconductor's legacy general-purpose transistor product line, designed for cost-sensitive, reliability-critical linear and switching applications across decades of electronic equipment generations.
FAQ
What is the pin configuration of BC547CNMBU?
The BC547CNMBU uses a standard TO-92 package with Collector (Pin 1), Base (Pin 2), and Emitter (Pin 3) in straight-lead configuration. This matches JEDEC TO-92 mechanical specification and is confirmed in Fairchild/ON Semiconductor datasheet Figure 7. Pin identification is viewable from the flat side with leads pointing downward and left-to-right ordering as C-B-E.
What does the 'NMBU' suffix mean in BC547CNMBU?
The 'NMBU' suffix in BC547CNMBU indicates a bulk-packaged variant with Fairchild/ON Semiconductor's standard marking and TO-92 straight-lead form. 'N' denotes the BC547 family, 'M' reflects manufacturing batch or wafer lot coding, and 'BU' confirms bulk packaging - consistent with ordering codes listed in the official datasheet table.
Is BC547CNMBU suitable for low-noise audio applications?
Yes, BC547CNMBU is suitable for low-noise audio applications: its noise figure is specified at 2.0–10.0 dB (VCE = 5 V, IC = 200 μA, f = 1 kHz, RG = 2 kΩ), matching the BC547 series' low-noise designation. This makes it appropriate for microphone preamplifiers and sensor front-ends where signal integrity is essential.
How does BC547CNMBU compare to BC547B in terms of hFE?
BC547CNMBU is a Class C device with hFE = 420–800 at VCE = 5 V and IC = 2 mA, whereas BC547B is Class B (hFE = 200–450). This higher and tighter gain range improves bias stability and reduces part-to-part variation in amplifier designs requiring precise transconductance control.
Can BC547CNMBU replace BC547C in existing designs?
Yes, BC547CNMBU is functionally and mechanically identical to BC547C - same hFE class, same absolute maximum ratings, same TO-92 package and pinout. The 'NMBU' suffix denotes bulk packaging and internal marking convention; no circuit modification or layout change is required when substituting BC547CNMBU for BC547C.
BC547CNMBU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 420 @ 2mA, 5V
- Power - Max:
- 500 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
BC547CNMBU FAQ
1.How can I place an order for BC547CNMBU through Aetrix?
Please submit a Request for Quotation (RFQ) for BC547CNMBU on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BC547CNMBU reliable?
The price and inventory of BC547CNMBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC547CNMBU is usually 5 days.
3.What payment methods are accepted for BC547CNMBU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC547CNMBU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC547CNMBU?
BC547CNMBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC547CNMBU order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BC547CNMBU?
For technical support, including BC547CNMBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC547CNMBU requirements.
6.How does Aetrix verify that BC547CNMBU is sourced from the original manufacturer or authorized distributors?
All BC547CNMBU products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BC547CNMBU meets industry standards.
7.What is the process for return or replacement of BC547CNMBU?
All BC547CNMBU units undergo pre-shipment inspection (PSI). If there is an issue with BC547CNMBU, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BC547CNMBU part is unused and in its original packaging.
Return procedure for BC547CNMBU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC547CNMBU Tags
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