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onsemi BC850CLT1
- Part No.:
- BC850CLT1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC850CLT1.pdf
- Description:
- TRANS NPN 45V 0.1A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,524
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Product details
Overview
BC850CLT1 from onsemi is an NPN silicon general-purpose transistor in SOT-23 package, rated for VCEO = 45 V, IC = 100 mA, and hFE = 420–800 (at IC = 2.0 mA, VCE = 5.0 V), with fT = 100 MHz and VCE(sat) ≤ 0.6 V at IC = 100 mA / IB = 5.0 mA - used in low-voltage switching and amplification stages of consumer power management circuits.
For engineers reviewing the BC850CLT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, ESD robustness (HBM >4000 V), moisture sensitivity level (MSL 1), and real-world design implications for discrete BJT selection in space-constrained PCBs.
Technical Context
The BC850CLT1 belongs to the BC846/847/848/849/850 family of complementary NPN transistors optimized for general-purpose linear and switching applications. It features a planar epitaxial die structure with emitter ballasting for improved current sharing and gain uniformity across production lots.
Its DC current gain (hFE) is binned to "C" grade (420–800 min–max at IC = 2.0 mA), and its saturation performance is characterized at two operating points: VCE(sat) ≤ 0.25 V @ IC/IB = 10 and ≤ 0.6 V @ IC/IB = 20 - enabling predictable drive requirements in digital logic interface and load-switching designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - maximum collector-emitter voltage before breakdown; suitable for 3.3 V and 5 V rail switching with margin. |
| IC | 100 mA continuous - supports moderate-current loads such as LED drivers, relay coils, and small-signal MOSFET gate control. |
| hFE | 420–800 at IC = 2.0 mA - high gain enables low-base-drive current in amplifier and sensor interface stages. |
| fT | 100 MHz - usable for audio-frequency amplification and low-speed digital signal conditioning up to ~10 MHz. |
| VCE(sat) | ≤ 0.6 V @ IC = 100 mA, IB = 5.0 mA - ensures <100 mW dissipation in saturated switch mode at full rated current. |
| RJA (FR-5) | 556 °C/W - thermal resistance defines junction-to-ambient rise; limits max power dissipation to 225 mW at 25°C ambient. |
| ESD HBM | >4000 V - allows safe handling without special ESD precautions during manual assembly or bench testing. |
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; JEDEC-compliant, MSL 1, Pb-free option available (BC850CLT1G).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal; requires ~5 mA base drive for full saturation at 100 mA collector current. |
| 2 | Emitter | Current return path; tied to ground or low-side reference in common-emitter configurations. |
| 3 | Collector | Output/load connection; handles up to 45 V and 100 mA; routed to higher-impedance nodes in amplifier use. |
Key Features
| Feature | Design Value |
|---|---|
| High hFE grade "C" | Guaranteed 420–800 gain at 2 mA collector current - reduces base resistor sizing and improves noise immunity in bias networks. |
| Low VCE(sat) | ≤ 0.25 V at IC/IB = 10 - minimizes conduction loss in power-efficient switching applications like battery-powered load control. |
| 100 MHz fT | Enables stable small-signal amplification up to audio band without external compensation in common-emitter topologies. |
| MSL 1 rating | Zero floor life limitation - can be stored indefinitely at ≤30°C/60% RH and mounted without bake-out or humidity preconditioning. |
| Pb-free option | BC850CLT1G variant available - meets RoHS Directive 2011/65/EU and J-STD-020 reflow profile requirements. |
Applications
| LED Driver Circuit | Microcontroller GPIO Expander |
|---|---|
|
Use Scenario: Driving 20 mA white LEDs from 3.3 V MCU outputs with current-limiting resistors. IC Role / Device Role / Timing Role: Low-side NPN switch controlled by microcontroller GPIO pin. Use Value: High hFE ensures full saturation with ≤1 mA base current, reducing MCU I/O loading and enabling direct drive without buffer ICs. |
Use Scenario: Adding 8-bit parallel output capability to an ARM Cortex-M0+ MCU with only 4 GPIOs available. IC Role / Device Role / Timing Role: Discrete transistor array implementing open-collector wired-OR logic for address decoding and peripheral enable signals. Use Value: VCEO = 45 V and low VCE(sat) allow reliable interfacing with 5 V peripherals while maintaining 3.3 V logic compatibility. |
| Audio Pre-amplifier Stage | Power Supply Enable Switch |
|
Use Scenario: Single-transistor common-emitter amplifier for electret microphone bias and signal gain in portable audio recorders. IC Role / Device Role / Timing Role: Linear amplifier with fixed emitter-degeneration bias network. Use Value: 100 MHz fT and low NF (4.0 dB @ 1 kHz) preserve signal integrity across 20 Hz–20 kHz bandwidth without oscillation risk. |
Use Scenario: Enabling 12 V auxiliary rail in industrial PLC I/O module using 3.3 V FPGA control signal. IC Role / Device Role / Timing Role: High-side switch driver stage controlling P-channel MOSFET gate. Use Value: Guaranteed hFE ≥420 ensures sufficient gate charge delivery to turn on 100 mΩ P-MOSFET within 10 µs, meeting system power-up timing specs. |
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 |
|---|---|---|---|
| BC847CLT1 | VCEO = 45 V (same), but hFE = 420–800 at IC = 2 mA - identical gain binning; same SOT-23 package and pinout. | Lower VCEO margin than BC850CLT1 in 48 V systems; otherwise functionally interchangeable in 5–24 V designs. | Select BC847CLT1 when cost optimization is prioritized and VCEO headroom above 45 V is not required. |
| MMBT3904LT1G | VCEO = 40 V (5 V lower), hFE = 100–300 (lower gain range), fT = 300 MHz (higher bandwidth); same SOT-23 package. | Less suitable for low-drive applications due to lower hFE; preferred where high-speed switching (>50 MHz) dominates over gain stability. | Choose MMBT3904LT1G only if bandwidth >100 MHz is critical and base drive capability permits higher IB. |
Compared with BC847CLT1, BC850CLT1 offers identical gain and voltage ratings but reflects later-generation process consistency; versus MMBT3904LT1G, it trades bandwidth for higher DC gain and tighter hFE distribution - making it preferable for precision biasing and low-power analog interfaces.
Availability
BC850CLT1 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, audio pre-amplifier stages, and power supply enable switches requiring stable component supply, consistent parametric binning, and long-term obsolescence mitigation.
Supply support for BC850CLT1 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 focused on energy-efficient innovation, serving automotive, industrial, cloud, medical, and IoT markets with discrete, analog, and embedded solutions.
The BC850CLT1 belongs to onsemi's general-purpose bipolar transistor product line, designed for cost-sensitive, space-constrained applications demanding reliable DC gain, low saturation voltage, and robust manufacturability in high-volume SMT assembly.
FAQ
What is the maximum collector-emitter voltage rating for BC850CLT1?
The BC850CLT1 has a guaranteed VCEO rating of 45 Vdc at IC = 10 mA. This rating is validated per JEDEC test conditions and applies under continuous DC operation at TA = 25°C. Derating is required above 25°C ambient per the 1.8 mW/°C thermal coefficient specified in the datasheet.
Is BC850CLT1 pin-compatible with BC847CLT1?
Yes, BC850CLT1 is pin-compatible with BC847CLT1 - both use SOT-23 package with identical pin 1 (base), pin 2 (emitter), pin 3 (collector) assignment and mechanical dimensions. The devices share identical marking style (2G vs 1G) and thermal characteristics, enabling drop-in replacement where VCEO = 45 V suffices.
What is the typical DC current gain (hFE) of BC850CLT1 at 10 mA collector current?
The BC850CLT1 is binned to "C" gain grade, with hFE = 420–800 at IC = 2.0 mA and VCE = 5.0 V. At IC = 10 mA, typical hFE is ~290–520 per the datasheet's "ON CHARACTERISTICS" table - confirming strong gain retention across its operational range.
Does BC850CLT1 meet RoHS requirements?
Yes, the BC850CLT1G variant is RoHS-compliant and Pb-free, qualified to J-STD-020 moisture sensitivity level 1. The standard BC850CLT1 is also lead-free per onsemi's global Pb-free initiative, with full compliance documentation available upon request from Aetrix Electronics.
Can BC850CLT1 be used in linear amplifier applications?
Yes, BC850CLT1 supports linear operation with verified small-signal parameters: fT = 100 MHz, Cobo = 4.5 pF, and NF = 4.0 dB at 1 kHz. Its gain flatness and low distortion make it suitable for audio pre-amplifiers and sensor signal conditioning when biased within its safe operating area (SOA) limits.
BC850CLT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- 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:
- 225 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
BC850CLT1 FAQ
1.How can I place an order for BC850CLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC850CLT1 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 BC850CLT1 reliable?
The price and inventory of BC850CLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC850CLT1 is usually 5 days.
3.What payment methods are accepted for BC850CLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC850CLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC850CLT1?
BC850CLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC850CLT1 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 BC850CLT1?
For technical support, including BC850CLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC850CLT1 requirements.
6.How does Aetrix verify that BC850CLT1 is sourced from the original manufacturer or authorized distributors?
All BC850CLT1 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 BC850CLT1 meets industry standards.
7.What is the process for return or replacement of BC850CLT1?
All BC850CLT1 units undergo pre-shipment inspection (PSI). If there is an issue with BC850CLT1, 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 BC850CLT1 part is unused and in its original packaging.
Return procedure for BC850CLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC850CLT1 Tags
-
MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
onsemi
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
onsemi
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MMBT2222A-TP
Micro Commercial Co
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MMBTA06LT1G
onsemi
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MMBT2222ALT1G
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