My Inquiry
My Account
onsemi BC548BZL1G
- Part No.:
- BC548BZL1G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
BC548BZL1G.pdf
- Description:
- TRANS NPN 30V 0.1A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:6,475
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BC548BZL1G from onsemi is an NPN silicon general-purpose amplifier transistor in TO-92 package, rated for 30 VCEO, 100 mA continuous collector current, and DC current gain (hFE) of 220–450 at IC = 2 mA, VCE = 5 V - widely used in low-power linear amplification and switching circuits in consumer electronics and industrial signal conditioning.
For engineers reviewing the BC548BZL1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal behavior, TO-92 terminal mapping, real-world use cases, and two validated alternative transistors with documented functional and application-level differences.
Technical Context
The BC548BZL1G operates as a discrete bipolar junction transistor optimized for medium-gain, low-noise amplification and saturated switching. Its hFE range (220–450) supports stable biasing across temperature, while fT = 300 MHz enables audio-frequency and low-speed digital signal handling. VCE(sat) ≤ 0.25 V at IC = 10 mA / IB = 1 mA ensures efficient switching in logic interface and driver stages.
Thermal resistance RJA = 200 °C/W and RJC = 83.3 °C/W define its power dissipation limits under ambient and case-cooled conditions. With VEBO = 6.0 V and TJ range of −55°C to +150°C, it supports operation in non-automotive industrial environments where reliability under thermal stress is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - Maximum safe collector-emitter voltage before breakdown; defines upper rail limit in amplifier or switch designs. |
| IC (continuous) | 100 mA - Sustained collector current capability; suitable for small-signal drivers and preamp stages. |
| hFE @ 2 mA, 5 V | 220–450 - DC current gain range enabling predictable bias point selection without excessive base drive overhead. |
| fT | 300 MHz - Unity-gain bandwidth; supports high-fidelity audio amplification and fast edge response in pulse applications. |
| VCE(sat) @ 10 mA/1 mA | ≤0.25 V - Low saturation voltage reduces power loss and heat generation in switching mode. |
| NF @ 0.2 mA | 2.0 dB - Low noise figure critical for microphone preamps and sensor signal conditioning. |
| RJA | 200 °C/W - Thermal resistance from junction to ambient; determines maximum power dissipation at given ambient temperature. |
Pinout & Package
BC548BZL1G uses the TO-92 (Case 29-11, Style 17) plastic package with straight leads and Pb-free finish. Dimensions: 4.45–5.20 mm (L) × 4.32–5.33 mm (W) × 3.18–4.19 mm (H). Lead spacing: 2.54 mm (0.1 inch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Collector) | Main output current path | Connected to load or next stage; requires voltage headroom ≥ VCEO (30 V) for safe operation. |
| 2 (Base) | Control input node | Receives current-limited drive to set operating point; sensitive to ESD due to VEBO = 6.0 V limit. |
| 3 (Emitter) | Reference and return path | Typically grounded or tied to emitter resistor; establishes bias stability via negative feedback. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free TO-92 package | Complies with RoHS Directive 2011/65/EU; compatible with lead-free reflow profiles (J-STD-020). |
| Low noise figure (2.0 dB) | Enables high-SNR amplification in microphone and sensor front-ends without external noise filtering. |
| High fT (300 MHz) | Supports wideband audio (<20 kHz) with margin, and clean square-wave reproduction up to ~10 MHz. |
| Wide hFE range (220–450) | Allows robust circuit design across manufacturing lots without individual gain binning or trim resistors. |
| −55°C to +150°C junction range | Validates operation in extended industrial environments, including enclosed enclosures with passive cooling. |
Applications
| Audio Pre-amplifier | LED Driver Switch |
|---|---|
|
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors in portable voice recorders. IC Role / Device Role / Timing Role: Discrete NPN amplifier configured in common-emitter topology with emitter degeneration for linearity. Use Value: 2.0 dB noise figure and 220–450 hFE ensure high-fidelity gain without added noise floor or bias drift. |
Use Scenario: Driving indicator LEDs or low-current status lamps in industrial control panels. IC Role / Device Role / Timing Role: Saturated switch turning LED on/off via microcontroller GPIO with current limiting. Use Value: VCE(sat) ≤ 0.25 V minimizes power loss and self-heating during continuous-on operation. |
| Signal Level Shifter | Relay Driver Stage |
|
Use Scenario: Translating 3.3 V logic outputs to 5 V or 12 V domains in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Common-emitter level translator with pull-up to higher rail and base driven by MCU pin. Use Value: 30 V VCEO rating safely accommodates 12 V relay coils or 5 V bus interfaces. |
Use Scenario: Providing base drive to power relays in HVAC controllers or PLC I/O modules. IC Role / Device Role / Timing Role: Medium-current switch interfacing microcontroller to relay coil (typically 20–100 mA). Use Value: 100 mA IC rating and 300 MHz fT support fast relay turn-on/turn-off without oscillation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose amplifier transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC547BZL1G | VCEO = 45 V, hFE = 200–450, same TO-92 Pb-free package | Higher voltage headroom; preferred where supply rails exceed 30 V but gain requirements match | Select BC547BZL1G when operating above 30 V or requiring margin against transient overvoltage. |
| BC847BMTF | SOT-23 package, VCEO = 45 V, hFE = 200–450, IC = 100 mA, same fT | Surface-mount footprint; not pin-compatible; requires PCB redesign | Choose BC847BMTF only for space-constrained designs where TO-92 is impractical and rework is acceptable. |
Compared with BC548BZL1G, BC547BZL1G offers higher VCEO without sacrificing gain or noise performance, while BC847BMTF provides identical electrical behavior in a miniature SMT form - both require explicit validation for thermal and layout compatibility in the target system.
Availability
BC548BZL1G is available at Aetrix Electronics and suitable for audio pre-amplifiers, LED drivers, level shifters, and relay driver stages requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.
Supply support for BC548BZL1G 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 management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BC548BZL1G belongs to onsemi's legacy BC5xx family of general-purpose NPN transistors, designed for cost-sensitive, high-reliability linear and switching applications in industrial controls and consumer electronics.
FAQ
What is the maximum collector-emitter voltage rating for BC548BZL1G?
The BC548BZL1G has a maximum collector-emitter voltage (VCEO) rating of 30 Vdc. This value is specified under test conditions of IC = 1.0 mA and IB = 0, and must not be exceeded in circuit design to prevent avalanche breakdown. Derating is recommended above 25°C ambient per the datasheet's thermal characteristics.
Is BC548BZL1G RoHS-compliant and what does the 'G' suffix indicate?
Yes, BC548BZL1G is RoHS-compliant. The 'G' suffix explicitly denotes a Pb-free (lead-free) construction per JEDEC J-STD-020 standards. It uses matte tin plating on leads and complies with EU Directive 2011/65/EU, confirmed in onsemi's official ordering information and package markings.
What is the DC current gain (hFE) range for BC548BZL1G at typical operating conditions?
The BC548BZL1G exhibits a DC current gain (hFE) range of 220 to 450 when tested at IC = 2.0 mA and VCE = 5.0 V. This range reflects device-to-device variation within the 'B' gain group and is validated across the full −55°C to +150°C junction temperature range.
Can BC548BZL1G be used in switching applications, and what is its typical VCE(sat)?
Yes, BC548BZL1G is routinely used in saturated switching applications. Its typical collector-emitter saturation voltage (VCE(sat)) is ≤0.25 V when IC = 10 mA and IB = 1 mA. This low saturation voltage minimizes conduction loss and self-heating in LED drivers, relay interfaces, and digital logic buffers.
What package type and pin configuration does BC548BZL1G use?
BC548BZL1G uses the TO-92 (Case 29-11, Style 17) plastic package with straight leads. Pin 1 is Collector, Pin 2 is Base, and Pin 3 is Emitter - confirmed in onsemi's mechanical drawings and marking diagram. The package is Pb-free and supplied in ammo box packaging (2000 units).
BC548BZL1G 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):
- 30 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)
BC548BZL1G FAQ
1.How can I place an order for BC548BZL1G through Aetrix?
Please submit a Request for Quotation (RFQ) for BC548BZL1G 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 BC548BZL1G reliable?
The price and inventory of BC548BZL1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC548BZL1G is usually 5 days.
3.What payment methods are accepted for BC548BZL1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC548BZL1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC548BZL1G?
BC548BZL1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC548BZL1G 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 BC548BZL1G?
For technical support, including BC548BZL1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC548BZL1G requirements.
6.How does Aetrix verify that BC548BZL1G is sourced from the original manufacturer or authorized distributors?
All BC548BZL1G 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 BC548BZL1G meets industry standards.
7.What is the process for return or replacement of BC548BZL1G?
All BC548BZL1G units undergo pre-shipment inspection (PSI). If there is an issue with BC548BZL1G, 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 BC548BZL1G part is unused and in its original packaging.
Return procedure for BC548BZL1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC548BZL1G Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
