My Inquiry
My Account
onsemi BC847CWT1
- Part No.:
- BC847CWT1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC847CWT1.pdf
- Description:
- TRANS NPN 45V 0.1A SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,417
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BC847CWT1 from onsemi is an NPN silicon general-purpose transistor in SC-70 (SOT-323) package, rated for VCEO = 45 V, IC = 100 mA, and hFE = 420–800 at IC = 2.0 mA / VCE = 5.0 V, used in low-power signal amplification and switching circuits on compact PCBs.
For engineers reviewing the BC847CWT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal limits, package dimensions, real-world use scenarios, and validated alternative parts - all specific to the BC847CWT1 variant within the BC846/847/848 family.
Technical Context
The BC847CWT1 operates as a discrete NPN bipolar junction transistor optimized for linear amplification and digital switching in low-voltage, low-current applications. Its hFE range (420–800) enables high-gain biasing with minimal base drive, while fT = 100 MHz supports audio and low-speed RF signal handling.
Thermal performance is defined by RJA = 833°C/W on FR-5 board and TJ = −55°C to +150°C, confirming suitability for ambient-temperature-stable consumer and industrial control logic. VCE(sat) ≤ 0.6 V at IC/IB = 10 ensures efficient saturation in driver stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum collector-emitter voltage before breakdown; sets safe operating range in 24 V and lower supply rails. |
| IC | 100 mA - Continuous collector current limit; defines maximum load drive capability without derating. |
| hFE | 420–800 at IC = 2.0 mA - High DC current gain enables low-base-current switching and stable amplifier biasing. |
| fT | 100 MHz - Current-gain bandwidth product; supports audio amplification and sub-100 MHz signal conditioning. |
| VCE(sat) | ≤ 0.6 V at IC = 10 mA / IB = 0.5 mA - Low saturation voltage minimizes power loss in switch-mode operation. |
| RJA | 833°C/W - Junction-to-ambient thermal resistance on FR-5 board; informs heatsinking requirements for continuous operation. |
Pinout & Package
BC847CWT1 uses the SC-70 (SOT-323) surface-mount package (Case 419, Style 3), measuring 2.10 × 1.24 × 0.90 mm, with gull-wing leads optimized for automated placement and reflow soldering on space-constrained boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal for forward-biased junction; requires ~0.7 V VBE(on) to initiate conduction. |
| 2 | Emitter | Current sink node; connected to ground or low-impedance return path in common-emitter configurations. |
| 3 | Collector | Current source node; connects to load and supply rail; handles up to 45 V and 100 mA in active/saturation modes. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free packaging | RoHS-compliant SC-70 construction with matte tin lead finish; compatible with standard SnPb and lead-free reflow profiles. |
| High hFE bin (C grade) | Guaranteed hFE ≥ 420 at 2.0 mA - reduces base drive circuit complexity and improves noise immunity in amplifier designs. |
| Low VCE(sat) | ≤ 0.6 V at IC/IB = 10 - lowers conduction losses in relay drivers and LED switches, improving system efficiency. |
| 100 MHz fT | Enables stable small-signal amplification up to audio frequencies without external compensation networks. |
Applications
| Audio Signal Amplification | Microcontroller GPIO Expansion |
|---|---|
|
Use Scenario: Boosting weak line-level audio signals (e.g., from electret microphones or DAC outputs) prior to ADC sampling or speaker driving. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with fixed bias or emitter degeneration. Use Value: High hFE (420–800) ensures >20 dB voltage gain with minimal base current, while fT = 100 MHz preserves fidelity across 20 Hz–20 kHz band. |
Use Scenario: Driving higher-current loads (e.g., LEDs, relays, or MOSFET gates) from low-drive MCU pins like those on STM32 or ESP32. IC Role / Device Role / Timing Role: Digital switch in saturated mode, translating 3.3 V logic to 5–24 V load control. Use Value: VCE(sat) ≤ 0.6 V at IC = 10 mA keeps power dissipation under 6 mW, enabling reliable operation without heatsinking. |
| Industrial Sensor Interface | Power Supply Enable Control |
|
Use Scenario: Level-shifting and buffering analog sensor outputs (e.g., thermistor voltage dividers or Hall-effect sensors) into ADC inputs. IC Role / Device Role / Timing Role: Emitter-follower buffer providing high input impedance and low output impedance. Use Value: VBE(on) = 580–770 mV ensures predictable turn-on threshold, and low Cobo = 4.5 pF prevents signal coupling in precision analog paths. |
Use Scenario: Enabling/disabling secondary power rails (e.g., 5 V or 3.3 V LDO outputs) via MCU-controlled high-side or low-side switching. IC Role / Device Role / Timing Role: Low-side switch controlling ground path of downstream regulators or isolated DC-DC modules. Use Value: IC = 100 mA rating supports enable currents up to 80 mA, and TJ = −55°C to +150°C ensures reliability in enclosed industrial enclosures. |
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 |
|---|---|---|---|
| BC847BWT1 | Lower hFE range (200–450 vs. 420–800); identical VCEO, IC, package, and pinout. | Suitable where moderate gain suffices (e.g., simple switching), but may require higher base drive in amplifier stages. | Select BC847BWT1 when cost sensitivity outweighs need for high gain stability or low-base-current operation. |
| MMBT3904LT1G | Same SC-70 package and pinout; VCEO = 40 V (vs. 45 V), hFE = 100–300 at IC = 10 mA - narrower, lower gain bin. | Valid for 3.3 V/5 V logic interfacing, but less suitable for low-noise amplification or marginal VCE margin applications. | Choose MMBT3904LT1G when legacy design compatibility or multi-source procurement drives selection over gain headroom. |
Compared with BC847BWT1 and MMBT3904LT1G, the BC847CWT1 provides the highest guaranteed hFE in its family, enabling lower base current consumption and improved signal-to-noise ratio in amplification roles - critical where bias network simplicity or analog accuracy is prioritized.
Availability
BC847CWT1 is available at Aetrix Electronics and suitable for audio signal conditioning, microcontroller peripheral driving, industrial sensor interfacing, and power rail enable control requiring stable component supply and consistent parametric performance across production batches.
Supply support for BC847CWT1 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 BC847CWT1 belongs to onsemi's BC846/847/848 series of general-purpose NPN transistors, designed specifically for cost-sensitive, space-constrained surface-mount applications demanding reliable DC gain, low saturation voltage, and robust thermal behavior.
FAQ
What is the maximum collector-emitter voltage rating for BC847CWT1?
The BC847CWT1 has a maximum collector-emitter voltage (VCEO) rating of 45 V, verified per onsemi's April 2007 datasheet Rev. 5. This rating applies under DC conditions with IC = 10 mA and defines the absolute upper limit before avalanche breakdown occurs. Engineers must maintain derating margins in designs exposed to transients or temperature extremes.
Is BC847CWT1 pin-compatible with BC847BWT1 and BC847AWT1?
Yes, BC847CWT1 shares identical SC-70 (SOT-323) package dimensions, pin assignment (Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector), and footprint with BC847BWT1 and BC847AWT1. All three variants differ only in hFE binning - not mechanical or electrical interface - enabling direct substitution where gain requirements permit.
What is the typical DC current gain (hFE) of BC847CWT1 at 2.0 mA collector current?
The BC847CWT1 exhibits hFE = 420–800 at IC = 2.0 mA and VCE = 5.0 V, per the "ON CHARACTERISTICS" table in the official datasheet. This wide range reflects manufacturing spread within the 'C' gain bin and must be accounted for in worst-case bias design - e.g., using hFE(min) = 420 for saturation assurance.
Does BC847CWT1 support lead-free soldering processes?
Yes, BC847CWT1 is offered in Pb-free packaging (denoted by 'G' suffix in BC847CWT1G), with matte tin-plated leads qualified for both SnPb and lead-free reflow profiles. The device complies with JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), permitting unlimited floor life at ≤30°C/85% RH.
What is the thermal resistance (RJA) of BC847CWT1 on FR-5 board?
The BC847CWT1 has a junction-to-ambient thermal resistance (RJA) of 833°C/W when mounted on a standard FR-5 printed circuit board at TA = 25°C, as specified in the "THERMAL CHARACTERISTICS" section. This value assumes no copper pour or thermal vias; adding 1-in² copper area can reduce RJA by ~200°C/W.
BC847CWT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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:
- 150 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3 (SOT323)
BC847CWT1 FAQ
1.How can I place an order for BC847CWT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC847CWT1 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 BC847CWT1 reliable?
The price and inventory of BC847CWT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC847CWT1 is usually 5 days.
3.What payment methods are accepted for BC847CWT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC847CWT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC847CWT1?
BC847CWT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC847CWT1 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 BC847CWT1?
For technical support, including BC847CWT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC847CWT1 requirements.
6.How does Aetrix verify that BC847CWT1 is sourced from the original manufacturer or authorized distributors?
All BC847CWT1 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 BC847CWT1 meets industry standards.
7.What is the process for return or replacement of BC847CWT1?
All BC847CWT1 units undergo pre-shipment inspection (PSI). If there is an issue with BC847CWT1, 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 BC847CWT1 part is unused and in its original packaging.
Return procedure for BC847CWT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC847CWT1 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…
