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onsemi BC849CLT1
- Part No.:
- BC849CLT1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC849CLT1.pdf
- Description:
- TRANS NPN 30V 0.1A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,071
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Product details
Overview
BC849CLT1 from onsemi is an NPN silicon general-purpose transistor in SOT-23 package, rated for VCEO = 30 V, IC = 100 mA, and hFE = 420–800 (at IC = 2.0 mA, VCE = 5.0 V), used in low-voltage signal amplification and switching circuits in consumer electronics power management.
For engineers reviewing the BC849CLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its guaranteed high DC current gain grade (C), 30 V VCEO rating, SOT-23 thermal performance (PD = 225 mW on FR-5), ESD robustness (>4000 V HBM), and Pb-free compliance.
Technical Context
The BC849CLT1 belongs to the BC846–BC850 family of complementary NPN/PNP transistors optimized for general-purpose linear and switching applications. It features a planar epitaxial die structure with emitter ballasting for improved gain uniformity and thermal stability across operating temperature (−55°C to +150°C).
Its electrical behavior is characterized by tight hFE binning (C-grade: 420–800), low VCE(sat) (≤0.6 V at IC = 100 mA, IB = 5.0 mA), and fT = 100 MHz - enabling reliable operation in audio preamplifiers, LED drivers, and logic-level interface stages where gain consistency and low saturation loss are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - Maximum collector-emitter voltage before breakdown; defines safe operating range in 24 V rail and battery-powered circuits. |
| IC | 100 mA - Continuous collector current limit; supports medium-current loads like relay coils or small solenoids. |
| hFE | 420–800 @ IC = 2.0 mA, VCE = 5.0 V - High, tightly binned DC current gain enables stable biasing in amplifier stages with minimal base drive. |
| fT | 100 MHz - Current-gain bandwidth product; ensures usable gain up to audio and low-RF frequencies without external compensation. |
| VCE(sat) | ≤0.6 V @ IC = 100 mA, IB = 5.0 mA - Low saturation voltage minimizes power loss and self-heating in switching applications. |
| ESD Rating (HBM) | >4000 V - Robust electrostatic discharge immunity simplifies handling and board assembly without special ESD controls. |
Pinout & Package
SOT-23 (Case 318, Style 6) surface-mount plastic package with 1.0 mm pitch, 2.0 mm × 1.25 mm footprint, and 0.95 mm height - compatible with standard reflow profiles and automated pick-and-place.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal; requires ~0.7 V forward bias and precise current limiting (e.g., via series resistor) to achieve target hFE-dependent collector current. |
| 2 | Emitter | Current return path; connected to ground or low-impedance reference; must be routed with low-inductance trace for stable switching. |
| 3 | Collector | Output terminal; handles load current up to 100 mA; requires adequate copper pour for thermal dissipation when operating near PD limit. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free SOT-23 package | RoHS-compliant construction with moisture sensitivity level 1 - eliminates lead-based solder concerns and enables standard reflow without baking. |
| High hFE grade C | Guaranteed 420–800 hFE binning reduces variation in amplifier gain and switch turn-on time across production lots. |
| Low VCE(sat) | ≤0.6 V at full rated current lowers conduction losses and improves efficiency in battery-operated load-switching designs. |
| 100 MHz fT | Supports stable small-signal amplification up to mid-audio frequencies without gain peaking or instability in common-emitter configurations. |
| ESD robustness | >4000 V HBM rating allows direct handling during prototyping and reduces risk of field failure in unshielded environments. |
Applications
| Audio Preamp Stage | LED Driver Switch |
|---|---|
|
Use Scenario: Amplifying weak microphone or line-level signals in portable audio devices before ADC sampling. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with fixed bias network. Use Value: High hFE (420–800) ensures consistent voltage gain across units; 100 MHz fT preserves signal fidelity up to 20 kHz without roll-off. |
Use Scenario: Driving 20–30 mA indicator LEDs from microcontroller GPIO pins in industrial HMIs. IC Role / Device Role / Timing Role: Low-side switch with saturated NPN operation controlled by digital logic. Use Value: VCE(sat) ≤ 0.6 V minimizes power loss and heat rise; SOT-23 footprint saves PCB area versus TO-92 alternatives. |
| Load Switch for 24 V Sensors | Level Translation Interface |
|
Use Scenario: Enabling/disabling 24 V analog sensor modules using 3.3 V MCU outputs in factory automation systems. IC Role / Device Role / Timing Role: Medium-current NPN switch interfacing between low-voltage control logic and higher-voltage peripherals. Use Value: 30 V VCEO safely isolates 24 V loads; 100 mA rating covers typical sensor quiescent + peak currents. |
Use Scenario: Converting 1.8 V/3.3 V logic outputs to 5 V-compatible signals for legacy peripherals in embedded gateways. IC Role / Device Role / Timing Role: Active pull-up stage in open-collector interface configuration. Use Value: Tight hFE binning ensures predictable rise/fall times; low VBE(on) (~660 mV typ.) guarantees reliable turn-on from low-VCC sources. |
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 (vs. 30 V), same hFE grade C (420–800), identical SOT-23 package and pinout. | Higher voltage margin suits 36 V automotive or industrial bus interfaces where 30 V may be marginal. | Select BC847CLT1 if system rail exceeds 28 V; otherwise BC849CLT1 offers tighter VCEO tolerance and lower cost in 24 V designs. |
| MMBT3904LT1G | Same VCEO = 40 V, hFE = 100–300 (standard grade), slightly higher RJA (625°C/W vs. 556°C/W on FR-5). | Lower gain spread increases bias design margin but reduces precision in gain-critical stages. | Choose MMBT3904LT1G for cost-sensitive, non-critical switching; retain BC849CLT1 where high, consistent hFE is required for analog accuracy. |
Compared with BC847CLT1 and MMBT3904LT1G, the BC849CLT1 delivers the highest guaranteed hFE range (420–800) at the lowest VCEO rating (30 V), making it optimal for compact, gain-stable 24 V or lower systems where voltage headroom is constrained and thermal budget is tight.
Availability
BC849CLT1 is available at Aetrix Electronics and suitable for audio preamplification, LED driver switching, 24 V sensor load control, and logic-level translation requiring stable component supply and RoHS-compliant packaging.
Supply support for BC849CLT1 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 BC849CLT1 belongs to onsemi's BC846–BC850 family of general-purpose bipolar transistors designed for high-volume, cost-sensitive linear and switching applications where reliability, gain consistency, and Pb-free compliance are essential.
FAQ
What is the maximum continuous collector current for BC849CLT1?
The BC849CLT1 has a maximum continuous collector current (IC) of 100 mA at TA = 25°C. Derating applies above 25°C per the thermal resistance specification (1.8 mW/°C on FR-5 board). This rating supports use in LED drivers, sensor interface switches, and low-power amplifiers without forced cooling.
Does BC849CLT1 have a Pb-free package option?
Yes, BC849CLT1G is the Pb-free variant of BC849CLT1, sharing identical electrical specifications and SOT-23 mechanical dimensions. Both meet RoHS Directive 2011/65/EU and have moisture sensitivity level 1, allowing standard reflow without pre-baking.
What is the guaranteed hFE range for BC849CLT1?
The BC849CLT1 is binned to the "C" gain grade, guaranteeing hFE = 420–800 at IC = 2.0 mA and VCE = 5.0 V. This tight range enables predictable biasing in amplifier circuits and reduces calibration effort in production test.
Can BC849CLT1 replace BC847CLT1 in existing designs?
BC849CLT1 is not a direct replacement for BC847CLT1 due to lower VCEO (30 V vs. 45 V) and VCBO (30 V vs. 50 V). It may be substituted only if the application operates ≤28 V with sufficient voltage margin and verified thermal performance under worst-case load conditions.
What is the thermal resistance junction-to-ambient for BC849CLT1 on FR-5 board?
The BC849CLT1 has a thermal resistance junction-to-ambient (RJA) of 556°C/W when mounted on a standard FR-5 board (1.0″ × 0.75″ × 0.062″) at TA = 25°C. This value assumes no additional copper pour; adding thermal pads or traces reduces effective RJA and improves power handling.
BC849CLT1 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):
- 30 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:
- 300 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)
BC849CLT1 FAQ
1.How can I place an order for BC849CLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC849CLT1 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 BC849CLT1 reliable?
The price and inventory of BC849CLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC849CLT1 is usually 5 days.
3.What payment methods are accepted for BC849CLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC849CLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC849CLT1?
BC849CLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC849CLT1 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 BC849CLT1?
For technical support, including BC849CLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC849CLT1 requirements.
6.How does Aetrix verify that BC849CLT1 is sourced from the original manufacturer or authorized distributors?
All BC849CLT1 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 BC849CLT1 meets industry standards.
7.What is the process for return or replacement of BC849CLT1?
All BC849CLT1 units undergo pre-shipment inspection (PSI). If there is an issue with BC849CLT1, 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 BC849CLT1 part is unused and in its original packaging.
Return procedure for BC849CLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC849CLT1 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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