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onsemi BC848ALT1
- Part No.:
- BC848ALT1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- -
- Datasheet:
-
BC848ALT1.pdf
- Description:
- TRANS NPN 30V 100MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:7,211
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Product details
Overview
BC848ALT1 from onsemi is an NPN general-purpose silicon transistor in SOT-23 package, rated for 30 VCEO, 100 mA continuous collector current, and 225 mW power dissipation on FR-5 board; it delivers hFE = 110–220 at IC = 10 mA, VCE = 5 V, and supports low-noise amplification and switching in compact consumer and industrial signal-path circuits.
For engineers reviewing the BC848ALT1 datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal derating behavior, SOT-23 terminal mapping, real-world use scenarios, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The BC848ALT1 operates as a discrete NPN bipolar junction transistor optimized for linear amplification and digital switching. Its DC current gain (hFE) is binned to "A" grade (110–220), and its fT = 100 MHz ensures stable small-signal performance up to mid-VHF range. Saturation voltages are specified at two operating points: VCE(sat) ≤ 0.25 V at IC/IB = 10 and ≤ 0.6 V at IC/IB = 20.
Thermal design relies on RJA = 556 °C/W (FR-5) or 417 °C/W (alumina), with linear derating of 1.8 mW/°C above 25°C on FR-5 board. ESD robustness includes >4000 V HBM and >400 V MM ratings, and moisture sensitivity level is rated at MSL 1 - unlimited floor life at ≤30°C/60% RH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - maximum safe collector-emitter voltage before breakdown under open-base condition; defines upper rail limit in low-voltage switching stages. |
| IC (continuous) | 100 mA - absolute max DC collector current; usable up to 80 mA for reliable long-term operation with margin. |
| hFE (min–max) | 110–220 - guaranteed DC current gain range at IC = 10 mA, VCE = 5 V; enables predictable biasing in amplifier and switch driver designs. |
| VCE(sat) | ≤0.25 V @ IC/IB = 10 - low saturation voltage minimizes conduction loss in saturated-switch applications like LED drivers or logic-level translators. |
| fT | 100 MHz - unity-gain frequency confirms suitability for audio preamps, oscillator buffers, and RF front-end gain stages up to ~10 MHz. |
| RJA (FR-5) | 556 °C/W - thermal resistance determines junction temperature rise; requires heatsinking or airflow above ~60 mW sustained dissipation. |
Pinout & Package
SOT-23 (Case 318, Style 6) surface-mount plastic package with gull-wing leads; 2.9 mm × 1.3 mm footprint, 1.0 mm height, and JEDEC-compliant lead pitch of 0.95 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Current-controlled input node; requires series resistor to limit base drive and ensure proper hFE-based collector current scaling. |
| 2 | Emitter | Reference terminal for bias network; connected to ground or low-impedance return path in common-emitter configurations. |
| 3 | Collector | Output current sink node; ties to load (e.g., relay coil, LED anode, pull-up resistor) in switching or active-load amplifier topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free SOT-23 packaging | RoHS-compliant construction with MSL 1 rating - supports reflow assembly without dry-pack requirements or baking. |
| ESD robustness | HBM >4000 V / MM >400 V - eliminates need for external ESD protection in handheld and I/O interface circuits. |
| Low VCE(sat) | 0.25 V typical at IC/IB = 10 - reduces power loss and self-heating in battery-powered switching nodes. |
| Stable hFE binning | A-grade (110–220) ensures consistent gain across production lots - simplifies bias network design without trimming. |
| High fT | 100 MHz - enables clean square-wave response in 1–5 MHz clock buffers and avoids phase lag in feedback paths. |
Applications
| Audio Signal Amplification | Microcontroller GPIO Expansion |
|---|---|
Use Scenario: Boosting line-level analog signals from sensors or DACs into headphone or speaker drivers in portable audio devices. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with emitter degeneration for gain stability and THD control. Use Value: 100 MHz fT and 110–220 hFE support flat 20 Hz–20 kHz response with <0.5% distortion at 1 VPP output swing. |
Use Scenario: Driving higher-current loads (e.g., LEDs, relays, MOSFET gates) from low-drive-strength MCU pins such as STM32 or PIC I/O. IC Role / Device Role / Timing Role: Digital switch translating 3.3 V logic to 5 V/12 V load control with fast turn-on/turn-off via base resistor optimization. Use Value: VCE(sat) ≤ 0.25 V at IC = 10 mA ensures <2.5 mW conduction loss and full saturation even with weak MCU drive capability. |
| Industrial Sensor Interface | Power Supply Feedback Loop |
Use Scenario: Level-shifting and buffering analog outputs from temperature, pressure, or current-sense ICs before ADC sampling in PLC modules. IC Role / Device Role / Timing Role: Emitter-follower buffer isolating sensitive sensor output from ADC input capacitance and PCB trace impedance. Use Value: Low output impedance (<50 Ω) and 100 MHz bandwidth preserve signal integrity and step response for sub-10 µs settling time. |
Use Scenario: Implementing optocoupler-driven error amplification in isolated DC-DC converter feedback paths (e.g., flyback or forward topologies). IC Role / Device Role / Timing Role: Transistor-based error amplifier stage comparing TL431 reference voltage against secondary-side output and driving optocoupler LED. Use Value: Tight hFE binning and low VBE(on) variation (580–700 mV) ensure repeatable loop gain and stable regulation across temperature and unit variance. |
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 |
|---|---|---|---|
| BC848BLT1 | Higher hFE bin: 200–450 at same test conditions; otherwise identical ratings and SOT-23 footprint. | Better suited for high-gain amplifiers or low-base-drive switching where tighter current control is needed. | Select BC848BLT1 when circuit gain margin is marginal or base drive current must be minimized. |
| MMBT3904LT1G | Same VCEO (40 V), higher IC (200 mA), wider hFE range (100–300); Pb-free SOT-23, but not A-grade binned. | Preferred for higher-current switching (e.g., >100 mA loads) or where broader hFE tolerance is acceptable. | Choose MMBT3904LT1G for cost-sensitive volume production requiring higher current headroom and RoHS compliance. |
Compared with BC848BLT1 and MMBT3904LT1G, the BC848ALT1 offers the narrowest hFE spread for predictable biasing, lower saturation voltage than MMBT3904LT1G at light loads, and tighter manufacturing consistency than un-binned alternatives - making it optimal for precision analog interfaces and low-power digital switching where repeatability matters.
Availability
BC848ALT1 is available at Aetrix Electronics and suitable for audio signal conditioning, microcontroller peripheral interfacing, and industrial sensor buffering requiring stable component supply, consistent parametric performance, and RoHS-compliant SMT assembly.
Supply support for BC848ALT1 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 BC848ALT1 belongs to onsemi's BC846–BC850 family of general-purpose NPN transistors designed for high-volume, cost-sensitive applications demanding reliability, consistent gain binning, and seamless SMT integration in space-constrained PCBs.
FAQ
What is the maximum operating temperature for BC848ALT1?
The BC848ALT1 has a junction and storage temperature range of −55°C to +150°C. Its thermal resistance (RJA) is 556 °C/W on FR-5 board, so sustained power dissipation above ~60 mW at ambient temperatures >50°C requires thermal analysis to keep TJ below 150°C. Derating begins at 25°C at 1.8 mW/°C.
Is BC848ALT1 pin-compatible with BC847ALT1 or BC846ALT1?
Yes - BC848ALT1 shares identical SOT-23 pinout (pin 1 = base, pin 2 = emitter, pin 3 = collector) and mechanical footprint with BC847ALT1 and BC846ALT1. However, their VCEO ratings differ (30 V vs. 45 V vs. 65 V), so substitution requires verification of voltage stress margins in the target circuit.
Does BC848ALT1 support Pb-free reflow soldering?
Yes - BC848ALT1 is offered in both standard and Pb-free versions (e.g., BC848ALT1G), with MSL 1 rating and compatibility with standard SnPb and lead-free reflow profiles per J-STD-020. No pre-baking is required prior to assembly.
What is the typical noise figure of BC848ALT1 at low currents?
The BC848ALT1 exhibits a noise figure of 10 dB at IC = 0.2 mA, VCE = 5.0 V, RS = 2.0 kΩ, f = 1.0 kHz, and BW = 200 Hz - making it suitable for low-noise preamplifier stages in sensor signal chains where sub-1 µV/√Hz input noise is acceptable.
Can BC848ALT1 be used in linear regulator pass transistor applications?
No - BC848ALT1 is not rated for linear regulator use due to limited power dissipation (225 mW max on FR-5) and lack of Safe Operating Area (SOA) characterization. It may function briefly in low-current, low-dropout emitter-follower configurations, but dedicated pass transistors or LDO ICs are recommended for regulated power delivery.
BC848ALT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Transistor Type:
- -
- Current - Collector (Ic) (Max):
- -
- Voltage - Collector Emitter Breakdown (Max):
- -
- Vce Saturation (Max) @ Ib, Ic:
- -
- Current - Collector Cutoff (Max):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- -
- Power - Max:
- -
- Frequency - Transition:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
BC848ALT1 FAQ
1.How can I place an order for BC848ALT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC848ALT1 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 BC848ALT1 reliable?
The price and inventory of BC848ALT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC848ALT1 is usually 5 days.
3.What payment methods are accepted for BC848ALT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC848ALT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC848ALT1?
BC848ALT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC848ALT1 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 BC848ALT1?
For technical support, including BC848ALT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC848ALT1 requirements.
6.How does Aetrix verify that BC848ALT1 is sourced from the original manufacturer or authorized distributors?
All BC848ALT1 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 BC848ALT1 meets industry standards.
7.What is the process for return or replacement of BC848ALT1?
All BC848ALT1 units undergo pre-shipment inspection (PSI). If there is an issue with BC848ALT1, 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 BC848ALT1 part is unused and in its original packaging.
Return procedure for BC848ALT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC848ALT1 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
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