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onsemi BC547BZL1G
- Part No.:
- BC547BZL1G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
BC547BZL1G.pdf
- Description:
- TRANS NPN 45V 0.1A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:7,261
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Product details
Overview
BC547BZL1G from onsemi is an NPN silicon general-purpose amplifier transistor in TO-92 package, rated for 45 VCEO, 50 VCBO, and 100 mA continuous collector current, with DC current gain (hFE) of 200–450 at IC = 2 mA and VCE = 5 V, used in low-power linear amplification and switching circuits in consumer electronics and industrial control interfaces.
For engineers reviewing the BC547BZL1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specifications, thermal performance data, TO-92 terminal mapping, real-world use cases, and two validated alternative transistors for design continuity and sourcing flexibility.
Technical Context
The BC547BZL1G operates as a discrete bipolar junction transistor with fixed NPN polarity, optimized for medium-gain analog amplification and saturated-switching applications. Its base-emitter on voltage is 0.55–0.77 V, collector-emitter saturation voltage is ≤0.25 V at IC = 10 mA / IB = 0.5 mA, and small-signal current gain bandwidth product (fT) is 300 MHz under standard test conditions.
Thermal resistance is specified at RJA = 200 °C/W (ambient) and RJC = 83.3 °C/W (case), supporting operation from −55 °C to +150 °C junction temperature. It exhibits input capacitance (Cibo) of 10 pF and output capacitance (Cobo) of 4.5 pF at VCB = 10 V, enabling stable performance in audio-frequency and low-speed digital switching designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage before breakdown; defines upper rail limit in amplifier stages. |
| IC (continuous) | 100 mA - Continuous collector current handling capacity; supports signal-level drive and relay coil switching. |
| hFE @ 2 mA / 5 V | 200–450 - DC current gain range ensuring predictable bias stability across production lots. |
| fT | 300 MHz - Current-gain bandwidth product; enables reliable operation up to ~100 MHz in RF-coupled preamp stages. |
| RJA | 200 °C/W - Junction-to-ambient thermal resistance; requires minimal heatsinking in PCB-mounted low-duty-cycle use. |
| VCE(sat) | ≤0.25 V @ IC/IB = 10/0.5 mA - Low saturation voltage minimizes power loss in switching mode. |
| NF | 2.0 dB @ 0.2 mA / 5 V - Low noise figure suitable for microphone preamplifiers and sensor signal conditioning. |
Pinout & Package
BC547BZL1G uses the TO-92 (Case 29-11, Style 17) plastic package with 3 leads: Collector (Pin 1), Base (Pin 2), Emitter (Pin 3). The package measures 4.45–5.20 mm in length, 4.32–5.33 mm in width, and has a lead pitch of 2.54 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Collector | Main current output terminal | Connected to load or supply rail; carries full collector current; must be routed with adequate copper area for thermal dissipation. |
| 2 - Base | Control input node | Receives bias current to regulate conduction; requires series resistor to limit drive current and prevent thermal runaway. |
| 3 - Emitter | Current return path | Typically grounded or connected to emitter resistor for stabilization; forms reference point for VBE biasing. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free construction | Meets RoHS Directive 2011/65/EU; compatible with lead-free reflow soldering profiles (J-STD-020). |
| High hFE consistency | Guaranteed 200–450 range at 2 mA / 5 V ensures stable DC operating point without individual transistor trimming. |
| Low VCE(sat) | ≤0.25 V enables <1 mW power loss at 10 mA switching, reducing self-heating in battery-powered systems. |
| Wide TJ range | −55 °C to +150 °C operation supports deployment in automotive engine compartments and industrial enclosures. |
| TO-92 mechanical standardization | Compatible with legacy socket footprints and automated pick-and-place equipment using standard tape-and-reel feeders. |
Applications
| Audio Pre-amplifier Stage | Microcontroller GPIO Driver |
|---|---|
|
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors before ADC sampling. IC Role / Device Role / Timing Role: Discrete NPN transistor configured in common-emitter topology for voltage gain and impedance matching. Use Value: 300 MHz fT and 2.0 dB noise figure preserve signal integrity in 20 Hz–20 kHz audio band without added distortion. |
Use Scenario: Driving LEDs, relays, or small solenoids from 3.3 V or 5 V microcontroller outputs. IC Role / Device Role / Timing Role: Saturated switch controlled by MCU GPIO pin through current-limiting base resistor. Use Value: ≤0.25 V VCE(sat) ensures >95% efficiency in on-state, minimizing heat generation during extended duty cycles. |
| Temperature Sensor Interface | Industrial Level Shifter |
|
Use Scenario: Converting PT100 or thermistor resistance changes into proportional voltage via constant-current source. IC Role / Device Role / Timing Role: Active component in current mirror or emitter-follower configuration for precision biasing. Use Value: Stable hFE over −55 °C to +150 °C maintains accuracy of current-source output across environmental extremes. |
Use Scenario: Translating logic levels between 3.3 V microcontrollers and 5 V legacy peripherals (e.g., UART, SPI). IC Role / Device Role / Timing Role: NPN-based open-collector level translator with pull-up to higher rail. Use Value: 45 V VCEO rating provides margin against transient overshoot, preventing latch-up in noisy industrial environments. |
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 |
|---|---|---|---|
| BC547CZL1G | Higher hFE range (420–800 vs. 200–450); same VCEO, VCBO, and package. | Better suited for high-gain, low-input-current amplifier stages where bias stability is critical. | Select BC547CZL1G when circuit gain tolerance requires tighter hFE control above 400. |
| MMBT3904LT1G | SMT SOT-23 package; identical VCEO (40 V), slightly lower hFE (100–300), and higher fT (300 MHz). | Enables miniaturized PCB layouts but requires rework of footprint and thermal management strategy. | Choose MMBT3904LT1G for space-constrained designs where TO-92 mounting is impractical. |
Compared with BC547BZL1G, BC547CZL1G offers higher gain for precision biasing while maintaining full pinout and thermal compatibility, whereas MMBT3904LT1G trades through-hole ease-of-use for surface-mount density and requires layout revision.
Availability
BC547BZL1G is available at Aetrix Electronics and suitable for audio preamplification, microcontroller peripheral driving, and industrial level-shifting applications requiring stable component supply, long-term obsolescence mitigation, and RoHS-compliant manufacturing.
Supply support for BC547BZL1G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BC547BZL1G belongs to onsemi's legacy general-purpose transistor family designed for cost-sensitive, high-volume linear and switching applications where reliability, parametric consistency, and manufacturability are prioritized over ultra-high-speed or high-voltage operation.
FAQ
What is the maximum collector-emitter voltage rating for BC547BZL1G?
The BC547BZL1G has a maximum collector-emitter voltage (VCEO) rating of 45 V DC. This value is tested with IC = 1.0 mA and IB = 0, and must not be exceeded to avoid device breakdown. Derating is recommended above 25 °C ambient per the datasheet's thermal derating curve. BC547BZL1G should not be used in circuits where transient spikes could exceed this limit without clamping protection.
Is BC547BZL1G RoHS compliant and lead-free?
Yes, BC547BZL1G is Pb-free and RoHS compliant, as confirmed by onsemi's packaging designation "ZL1G" and documentation in the BC546/D datasheet. The device meets EU Directive 2011/65/EU and is qualified for lead-free reflow soldering per J-STD-020. No lead content is present in the die, bond wires, or TO-92 molded package of BC547BZL1G.
What is the DC current gain (hFE) range for BC547BZL1G at typical operating conditions?
The BC547BZL1G exhibits a DC current gain (hFE) range of 200 to 450 when measured at IC = 2.0 mA and VCE = 5.0 V, per the onsemi BC546/D datasheet. This range reflects production lot variation and ensures predictable bias point selection in amplifier and switching designs without requiring individual transistor binning. BC547BZL1G does not guarantee hFE outside this defined test condition.
Can BC547BZL1G be used in switching applications, and what is its saturation voltage?
Yes, BC547BZL1G is routinely used in saturated switching applications such as LED drivers and relay controls. Its collector-emitter saturation voltage (VCE(sat)) is guaranteed ≤0.25 V at IC = 10 mA and IB = 0.5 mA. At higher currents (e.g., IC = 100 mA), VCE(sat) rises to ≤0.6 V, so proper base drive must be ensured to maintain low-loss operation in BC547BZL1G-based switches.
What is the thermal resistance and maximum junction temperature for BC547BZL1G?
The BC547BZL1G has a junction-to-ambient thermal resistance (RJA) of 200 °C/W and a junction-to-case resistance (RJC) of 83.3 °C/W. Its absolute maximum operating junction temperature is +150 °C, with storage temperature extending from −55 °C to +150 °C. These values assume standard PCB mounting on FR-4 with 1-inch² copper pour; actual thermal performance depends on board layout and airflow in the final BC547BZL1G application.
BC547BZL1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Packaging:
- Cut Tape (CT)
- 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
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 200 @ 2mA, 5V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92 (TO-226)
BC547BZL1G FAQ
1.How can I place an order for BC547BZL1G through Aetrix?
Please submit a Request for Quotation (RFQ) for BC547BZL1G 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 BC547BZL1G reliable?
The price and inventory of BC547BZL1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC547BZL1G is usually 5 days.
3.What payment methods are accepted for BC547BZL1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC547BZL1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC547BZL1G?
BC547BZL1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC547BZL1G 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 BC547BZL1G?
For technical support, including BC547BZL1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC547BZL1G requirements.
6.How does Aetrix verify that BC547BZL1G is sourced from the original manufacturer or authorized distributors?
All BC547BZL1G 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 BC547BZL1G meets industry standards.
7.What is the process for return or replacement of BC547BZL1G?
All BC547BZL1G units undergo pre-shipment inspection (PSI). If there is an issue with BC547BZL1G, 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 BC547BZL1G part is unused and in its original packaging.
Return procedure for BC547BZL1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC547BZL1G Tags
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