My Inquiry
My Account
onsemi BC548BRL1G
- Part No.:
- BC548BRL1G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
BC548BRL1G.pdf
- Description:
- TRANS NPN 30V 0.1A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:5,190
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BC548BRL1G from onsemi is an NPN silicon general-purpose amplifier transistor in TO-92 package, rated for 30 VCEO, 100 mA continuous collector current, and 625 mW power dissipation at 25°C ambient - used in low-power linear amplification, switching, and signal conditioning circuits in consumer electronics and industrial control interfaces.
For engineers reviewing the BC548BRL1G datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain (hFE = 200–450 at IC = 2 mA), VCE(sat) ≤ 0.25 V at IC/IB = 10, fT = 300 MHz, and thermal resistance RJA = 200 °C/W - all critical for bias stability, switching speed, and thermal management in discrete analog designs.
Technical Context
The BC548BRL1G operates as a standard bipolar junction transistor with fixed-emitter configuration, supporting Class-A amplification and saturated-switching modes. Its hFE range (200–450) and low VBE(on) (0.55–0.77 V) enable predictable base drive design across temperature (−55°C to +150°C).
It features fT = 300 MHz at IC = 10 mA and VCE = 5 V, Cobo = 4.5 pF at VCB = 10 V, and noise figure NF = 2.0 dB at IC = 0.2 mA - confirming suitability for audio-frequency amplification and low-noise preamplifier stages where bandwidth and signal integrity are prioritized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - maximum safe collector-emitter voltage before breakdown; defines rail headroom in low-voltage amplifier or switch designs. |
| IC (continuous) | 100 mA - sets upper limit for load current handling without derating; suitable for driving LEDs, relays, or small-signal stages. |
| hFE | 200–450 at IC = 2 mA - ensures stable DC bias point with minimal base current variation across production lots. |
| fT | 300 MHz - supports high-fidelity audio amplification up to ~100 kHz with adequate gain margin and phase stability. |
| VCE(sat) | ≤ 0.25 V at IC/IB = 10 - minimizes conduction loss and self-heating during switching operation. |
| RJA | 200 °C/W - requires heatsinking or layout derating above ~300 mW ambient power dissipation to maintain TJ < 150°C. |
Pinout & Package
BC548BRL1G uses the TO-92 (Case 29, Style 17) through-hole plastic package with bent leads and Pb-free finish. Dimensions: 4.45–5.20 mm height × 4.32–5.33 mm width × 3.18–4.19 mm thickness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Collector) | Main current output terminal | Connected to load or next stage; must be isolated from ground when used in common-emitter configuration. |
| 2 (Base) | Control input terminal | Receives bias current to regulate collector current; requires current-limiting resistor to prevent overdrive. |
| 3 (Emitter) | Current return path | Typically tied to ground or emitter resistor for bias stabilization; defines reference node for VBE and hFE operation. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free TO-92 package | Complies with RoHS Directive 2011/65/EU; enables lead-free reflow soldering without contamination risk. |
| DC current gain hFE ≥ 200 | Reduces required base drive current by >5× vs. lower-gain transistors, easing microcontroller GPIO loading. |
| VCE(sat) ≤ 0.25 V | Limits power loss to <2.5 mW at 10 mA collector current, improving efficiency in battery-powered switches. |
| fT = 300 MHz | Provides >30× bandwidth margin at 10 kHz audio frequencies, ensuring flat gain response and low distortion. |
| −55°C to +150°C operating range | Supports deployment in automotive under-hood modules and industrial PLC I/O stages without derating. |
Applications
| Audio Preamplifier Stage | Microcontroller GPIO Driver |
|---|---|
|
Use Scenario: Amplifying weak microphone or sensor signals prior to ADC sampling in portable audio recorders. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with emitter degeneration. Use Value: hFE = 200–450 ensures consistent gain across units; NF = 2.0 dB preserves SNR in sub-1 mV input signals. |
Use Scenario: Switching 12 V relay coils or LED arrays using 3.3 V or 5 V MCU outputs. IC Role / Device Role / Timing Role: Saturated NPN switch with base resistor limiting IB to achieve IC/IB = 10. Use Value: VCE(sat) ≤ 0.25 V limits coil power loss to <3 mW, reducing thermal stress on PCB traces. |
| Temperature Sensor Interface | Industrial Signal Conditioning |
|
Use Scenario: Linearizing and amplifying output of silicon bandgap temperature sensors in HVAC controllers. IC Role / Device Role / Timing Role: DC-coupled Class-A amplifier with fixed bias network and emitter feedback. Use Value: Stable hFE over −40°C to +85°C ensures <±2% gain drift; TJ rating supports enclosure ambient up to 70°C. |
Use Scenario: Level-shifting and buffering 0–10 V analog sensor outputs for PLC analog input modules. IC Role / Device Role / Timing Role: Emitter-follower buffer providing high input impedance and low output impedance. Use Value: Cibo = 10 pF minimizes capacitive loading on source; RJA = 200 °C/W allows 500 mW operation with 25°C rise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC547BRL1G | VCEO = 45 V, VCBO = 50 V, hFE = 200–450 - higher voltage rating but identical gain and package. | Better suited for 24 V industrial bus interfaces where transient spikes exceed 30 V. | Select BC547BRL1G when system rail voltage exceeds 30 V but same gain and footprint are required. |
| BC548CRL1G | hFE = 420–800 at IC = 2 mA - higher minimum gain, same VCEO and package. | Preferred for ultra-low-base-drive designs like battery-operated sensor nodes with tight current budgets. | Choose BC548CRL1G only if guaranteed high hFE is mandatory and VCEO margin is sufficient. |
Compared with BC547BRL1G and BC548CRL1G, the BC548BRL1G offers optimal balance of voltage margin (30 V), gain consistency (200–450), and thermal performance (RJA = 200 °C/W) for cost-sensitive 5–12 V embedded systems requiring reliable, field-proven discrete amplification.
Availability
BC548BRL1G is available at Aetrix Electronics and suitable for audio preamplifiers, microcontroller GPIO drivers, temperature sensor interfaces, and industrial signal conditioning requiring stable component supply across long-lifecycle embedded programs.
Supply support for BC548BRL1G 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 BC548BRL1G belongs to onsemi's legacy BC546–BC548 family of general-purpose NPN transistors, designed for robust, low-cost discrete amplification and switching in cost-sensitive, high-volume applications.
FAQ
What is the maximum collector-emitter voltage rating for BC548BRL1G?
The BC548BRL1G has a maximum collector-emitter voltage (VCEO) rating of 30 Vdc, verified per onsemi's BC546/D datasheet Rev. 8 (August 2021). This value is measured at IC = 1.0 mA and IB = 0, and must not be exceeded to avoid avalanche breakdown or permanent device damage. Derating is recommended above 70°C ambient.
Does BC548BRL1G support lead-free soldering processes?
Yes, BC548BRL1G is explicitly marked as Pb-free in onsemi's ordering information and complies with JEDEC J-STD-020 moisture sensitivity level (MSL) 1. Its TO-92 package is qualified for peak reflow temperatures up to 260°C, matching standard lead-free solder profiles without delamination or plating degradation.
What is the typical DC current gain (hFE) of BC548BRL1G at 2 mA collector current?
The BC548BRL1G exhibits hFE = 200–450 at IC = 2.0 mA and VCE = 5.0 V, as specified in the "ON CHARACTERISTICS" table of the official datasheet. This range reflects production lot variation and ensures predictable biasing across temperature (−55°C to +150°C) without recalibration.
Can BC548BRL1G be used in switching applications?
Yes, BC548BRL1G is routinely used in saturated switching mode, with VCE(sat) ≤ 0.25 V at IC/IB = 10 and ton/toff < 200 ns (derived from fT = 300 MHz). It reliably drives loads up to 100 mA, such as LEDs, small relays, or logic-level translators, provided base current is properly limited.
What is the thermal resistance from junction to ambient (RJA) for BC548BRL1G?
The thermal resistance from junction to ambient (RJA) for BC548BRL1G is 200 °C/W, measured under standard JEDEC test conditions (single device on FR-4 board, 1-inch² copper pad). At 625 mW dissipation, this yields a 125°C junction-to-ambient rise - requiring layout derating or heatsinking above 300 mW in enclosed environments.
BC548BRL1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Packaging:
- Tape & Reel (TR)
- 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)
BC548BRL1G FAQ
1.How can I place an order for BC548BRL1G through Aetrix?
Please submit a Request for Quotation (RFQ) for BC548BRL1G 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 BC548BRL1G reliable?
The price and inventory of BC548BRL1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC548BRL1G is usually 5 days.
3.What payment methods are accepted for BC548BRL1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC548BRL1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC548BRL1G?
BC548BRL1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC548BRL1G 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 BC548BRL1G?
For technical support, including BC548BRL1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC548BRL1G requirements.
6.How does Aetrix verify that BC548BRL1G is sourced from the original manufacturer or authorized distributors?
All BC548BRL1G 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 BC548BRL1G meets industry standards.
7.What is the process for return or replacement of BC548BRL1G?
All BC548BRL1G units undergo pre-shipment inspection (PSI). If there is an issue with BC548BRL1G, 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 BC548BRL1G part is unused and in its original packaging.
Return procedure for BC548BRL1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC548BRL1G 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…
