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onsemi BCW32LT1
- Part No.:
- BCW32LT1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- -
- Datasheet:
-
BCW32LT1.pdf
- Description:
- TRANS NPN GP 32V 100MA SOT-23
- Quantity:
- Payment:
- Shipping:
Inventory:423,000
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Product details
Overview
BCW32LT1 from onsemi is an NPN silicon general-purpose transistor in SOT-23 package, rated for 32 VCEO, 100 mA continuous collector current, and DC current gain (hFE) of 200–450 at IC = 2 mA. It serves as a low-noise amplification or switching element in automotive signal conditioning and industrial sensor interface circuits.
For engineers reviewing the BCW32LT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q101 qualification, 10 dB noise figure at 1 kHz, 4.0 pF output capacitance, and thermal resistance of 556 °C/W on FR-5 board - all critical for low-power analog front-end and automotive-grade biasing designs.
Technical Context
This NPN bipolar junction transistor operates with VCEO = 32 V, VBE(on) = 0.55–0.70 V at IC = 2 mA, and VCE(sat) ≤ 0.25 V at IC/IB = 20. Its noise performance is characterized across 10 Hz–15.7 kHz bandwidth, with minimum noise figure of 1.0 dB at optimized source resistance and collector current.
The device uses standard SOT-23 (TO-236) packaging with pin 1 = Base, pin 2 = Emitter, pin 3 = Collector. Thermal derating is 1.8 mW/°C above 25 °C on FR-5 board, supporting reliable operation in ambient temperatures from −55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 32 V - Maximum safe collector-emitter voltage before breakdown; defines rail compatibility in 24 V automotive and industrial control circuits. |
| IC Continuous | 100 mA - Sustained collector current handling; suitable for driving small relays, LEDs, or pre-amplifier stages without forced cooling. |
| hFE | 200–450 - DC current gain range at IC = 2 mA, VCE = 5 V; enables predictable base drive sizing in linear and saturated switch modes. |
| Noise Figure | 10 dB max at 1 kHz - Measured with RS = 2 kΩ, BW = 200 Hz; supports low-noise audio and sensor signal amplification where SNR is critical. |
| Cobo | 4.0 pF max - Output capacitance at VCB = 10 V, f = 1 MHz; limits high-frequency gain roll-off and ensures stability in RF-coupled amplifier stages. |
| PD (FR-5) | 225 mW at TA = 25 °C - Total power dissipation limit on standard PCB; requires thermal derating beyond 25 °C per 1.8 mW/°C slope. |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, with gull-wing leads and Pb-free finish. Marking "BCW32LT1G" appears on top surface; pin 1 is identified by dot or bevelled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal for forward-biased junction; requires current-limited drive to achieve target hFE-dependent collector current. |
| 2 | Emitter | Current return path; connected to ground or low-impedance reference in common-emitter configurations. |
| 3 | Collector | Output current node; interfaces with load (e.g., pull-up resistor, relay coil) and determines voltage swing capability up to 32 V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics requiring PPAP compliance. |
| Low Noise Figure | 1.0 dB minimum at 100 Hz with optimal RS; enables high-fidelity signal amplification in microphone preamps and sensor front-ends. |
| Pb-Free / RoHS Compliant | Fully compliant with EU RoHS Directive 2011/65/EU and halogen-free/BFR-free requirements for green manufacturing. |
| Wide Temperature Range | −55 °C to +150 °C operating and storage range; supports under-hood and industrial environments without derating penalties. |
Applications
| Automotive Sensor Interface | Industrial Signal Conditioning |
|---|---|
Use Scenario: Amplifying low-level signals from temperature or pressure sensors in engine management systems. IC Role / Device Role / Timing Role: NPN transconductance amplifier in common-emitter configuration with emitter degeneration. Use Value: 10 dB noise figure and 200–450 hFE ensure stable gain and minimal signal corruption in noisy 12 V vehicle electrical environments. |
Use Scenario: Level-shifting and buffering analog outputs from 3.3 V microcontrollers to 24 V PLC inputs. IC Role / Device Role / Timing Role: General-purpose switching transistor used in open-collector output stages. Use Value: 32 V VCEO and 100 mA IC support direct interfacing with industrial I/O standards without external protection circuitry. |
| Portable Audio Preamp | LED Driver for Status Indication |
Use Scenario: Low-noise first-stage amplification in battery-powered headphone amplifiers or voice recorders. IC Role / Device Role / Timing Role: Linear-mode NPN amplifier biased at IC = 0.2–1 mA for optimal noise performance. Use Value: Minimum 1.0 dB noise figure at 100 Hz and low Cobo preserve audio fidelity while minimizing PCB area and BOM count. |
Use Scenario: Driving discrete indicator LEDs in medical devices and test equipment panels. IC Role / Device Role / Timing Role: Saturated switch controlling LED current via base-resistor network. Use Value: VCE(sat) ≤ 0.25 V at IC/IB = 20 minimizes power loss and heat generation in space-constrained 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 |
|---|---|---|---|
| BC847B,215 (Nexperia) | hFE = 200–450 (same range), but VCEO = 45 V and Cobo = 4.5 pF; no AEC-Q101 qualification. | Higher voltage margin suits broader industrial use, but lacks automotive qualification and has slightly higher capacitance. | Select BC847B,215 only when AEC-Q101 is not required and 45 V headroom improves system safety margin. |
| MMBT3904LT1G (onsemi) | Same SOT-23 package and AEC-Q101 rating, but hFE = 100–300 and VCEO = 40 V; noise figure not specified. | Broader hFE tolerance and higher VCEO suit digital switching, but lacks documented low-noise performance. | Choose MMBT3904LT1G for cost-sensitive digital logic interfacing where noise is irrelevant and higher voltage tolerance is preferred. |
Compared with BCW32LT1, BC847B,215 offers higher voltage rating but no automotive qualification, while MMBT3904LT1G provides wider availability and higher VCEO but omits noise characterization - making BCW32LT1 uniquely suited for AEC-Q101-compliant low-noise analog signal paths.
Availability
BCW32LT1 is available at Aetrix Electronics and suitable for automotive sensor interface, industrial signal conditioning, portable audio preamp, and LED driver applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for BCW32LT1 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 electronics for automotive, industrial, cloud, and IoT applications.
The BCW32LT1 belongs to onsemi's automotive-qualified general-purpose transistor product line, designed specifically for robust, low-noise signal amplification and switching in harsh-environment electronic control units.
FAQ
What is the maximum collector-emitter voltage rating for BCW32LT1?
The BCW32LT1 has a maximum collector-emitter voltage (VCEO) rating of 32 Vdc, verified per onsemi's datasheet revision 5 (October 2024). This rating applies under continuous DC conditions with base open and defines the absolute upper limit for safe operation in common-emitter configurations. Exceeding this value risks irreversible breakdown and permanent device failure.
Is BCW32LT1 qualified for automotive applications?
Yes, BCW32LT1 is AEC-Q101 qualified and PPAP capable, as confirmed in the official onsemi datasheet. The NSV prefix in the ordering part number NSVBCW32LT1G explicitly denotes compliance with automotive site and change control requirements, making BCW32LT1 suitable for engine control, body electronics, and ADAS subsystems.
What is the typical noise figure of BCW32LT1 and under what conditions is it measured?
The BCW32LT1 has a maximum noise figure of 10 dB at 1.0 kHz, measured with IC = 0.2 mA, VCE = 5.0 Vdc, RS = 2.0 kΩ, and bandwidth = 200 Hz. Minimum noise figure of 1.0 dB is achievable at 100 Hz with optimized source resistance, as shown in Figure 3 of the onsemi datasheet.
What is the pin configuration of BCW32LT1 in the SOT-23 package?
The BCW32LT1 uses Style 6 pinout for SOT-23: pin 1 = Base, pin 2 = Emitter, pin 3 = Collector. This configuration is explicitly defined in the mechanical drawings on page 2 of the onsemi BCW32LT1/D datasheet and validated against marking diagrams and package outline documentation.
Does BCW32LT1 have Pb-free and RoHS-compliant packaging?
Yes, BCW32LT1 is Pb-free, halogen-free/BFR-free, and RoHS compliant, as stated in the Features section of the onsemi datasheet. The "G" suffix in BCW32LT1G and NSVBCW32LT1G denotes the Pb-free package, and the device meets EU Directive 2011/65/EU requirements without exemptions.
BCW32LT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- 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:
- -
BCW32LT1 FAQ
1.How can I place an order for BCW32LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BCW32LT1 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 BCW32LT1 reliable?
The price and inventory of BCW32LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCW32LT1 is usually 5 days.
3.What payment methods are accepted for BCW32LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCW32LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCW32LT1?
BCW32LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCW32LT1 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 BCW32LT1?
For technical support, including BCW32LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCW32LT1 requirements.
6.How does Aetrix verify that BCW32LT1 is sourced from the original manufacturer or authorized distributors?
All BCW32LT1 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 BCW32LT1 meets industry standards.
7.What is the process for return or replacement of BCW32LT1?
All BCW32LT1 units undergo pre-shipment inspection (PSI). If there is an issue with BCW32LT1, 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 BCW32LT1 part is unused and in its original packaging.
Return procedure for BCW32LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BCW32LT1 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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