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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi BCW30LT1

Name: BCW30LT1
Brand: onsemi
SKU: BCW30LT1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCW30LT1

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: -

Datasheet:: BCW30LT1.pdf

Description:: TRANS PNP GP 32V 100MA SOT-23

Quantity:: RFQ Add To RFQ list

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Inventory:126,000

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Product details

Overview

BCW30LT1 from onsemi is a PNP silicon general-purpose transistor in SOT-23 package, rated for −32 V_CEO, −100 mA continuous collector current, and DC current gain (h_FE) of 215–500 at −2 mA/−5 V; used in low-power signal amplification and switching circuits in automotive body control modules and industrial sensor interfaces.

For engineers reviewing the BCW30LT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating curves, noise performance data, and AEC-Q101 qualification status - all confirmed from onsemi's official Rev. 5 datasheet (November 2024).

Technical Context

This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with guaranteed V_CE(sat) ≤ −0.3 V at −10 mA/−0.5 mA drive and V_BE(on) between −0.6 V and −0.75 V under standard bias conditions. Its 7.0 pF output capacitance (C_obo) and 10 dB max noise figure support audio-frequency and low-speed digital switching applications.

Thermal design is enabled by two validated dissipation modes: 225 mW on FR-5 board (derated 1.8 mW/°C above 25°C) and 300 mW on alumina substrate (derated 2.4 mW/°C), with corresponding R_JA values of 556 °C/W and 417 °C/W - enabling selection based on PCB material and thermal mass.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−32 Vdc - Maximum safe voltage across collector-emitter before breakdown; defines rail compatibility in negative-supply logic and level-shifting stages.
I_C (continuous)	−100 mAdc - Continuous current-handling capability; supports driving small relays, LEDs, or logic-level translators without forced cooling.
h_FE	215–500 - DC current gain range at −2 mA/−5 V; enables predictable base drive sizing for stable switching or linear amplification.
V_CE(sat)	≤ −0.3 Vdc at −10 mA/−0.5 mA - Low saturation voltage minimizes power loss and heat generation in switching applications.
C_obo	≤ 7.0 pF at −10 V_CB, 1 MHz - Output capacitance limits high-frequency response; suitable for ≤10 MHz signal paths.
NF	≤ 10 dB at −0.2 mA, −5 V_CE, 2 kΩ source, 1 kHz - Confirmed noise performance for low-level analog preamplifier stages.
R_JA (FR-5)	556 °C/W - Junction-to-ambient thermal resistance on standard epoxy-glass PCB; determines temperature rise per milliwatt dissipated.

Pinout & Package

SOT-23 (TO-236) package, 2.90 × 1.30 × 1.00 mm, 3-pin surface-mount plastic case (Case 318-08, Style 6), Pb-free and RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased PNP operation; requires negative current relative to emitter to turn on.
2	Emiter	Current source terminal; connected to higher potential (e.g., V_CC) in common-emitter configurations.
3	Collector	Current sink terminal; delivers load current to ground or lower-potential node when saturated.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including body electronics and cabin sensors; includes PPAP documentation support.
Pb-free, Halogen-free/BFR-free	Complies with RoHS Directive 2011/65/EU and JEDEC JS709C; eliminates hazardous substances in assembly and end-of-life handling.
Low V_CE(sat)	Guaranteed ≤ −0.3 V at I_C/I_B = 20; reduces conduction loss and improves efficiency in battery-powered switches.
High h_FE consistency	Min 215 at −2 mA/−5 V ensures reliable base drive margin across production lots and temperature ranges (−55°C to +150°C).
Low noise figure	≤10 dB at 1 kHz enables use in microphone preamps and sensor signal conditioning where SNR is critical.

Applications

Automotive Door Module Switching	Industrial Proximity Sensor Interface
Use Scenario: Driving small solenoids and LED indicators in vehicle door latch and window control units. IC Role / Device Role / Timing Role: PNP switch controlling 12 V loads with microcontroller GPIO-level base drive. Use Value: −32 V rating accommodates automotive load-dump transients; −0.3 V saturation minimizes self-heating during duty-cycled operation.	Use Scenario: Level-shifting and signal inversion between 3.3 V microcontrollers and 5 V/12 V proximity sensor outputs. IC Role / Device Role / Timing Role: General-purpose PNP inverter stage translating logic states while providing current gain. Use Value: 215–500 h_FE ensures robust drive capability across temperature; SOT-23 footprint saves space in compact sensor housings.
Consumer Audio Preamp Stage	Medical Patient Monitor Signal Conditioning
Use Scenario: Low-noise amplification of electret microphone signals in portable audio recorders. IC Role / Device Role / Timing Role: Common-emitter amplifier biased in active region for voltage gain. Use Value: ≤10 dB noise figure at 1 kHz and low C_obo preserve signal fidelity without requiring complex shielding.	Use Scenario: Isolating and buffering analog sensor outputs (e.g., temperature, pulse oximetry) before ADC sampling. IC Role / Device Role / Timing Role: Emitter-follower buffer providing high input impedance and low output impedance. Use Value: −55°C to +150°C operating range supports sterilization cycles and extended clinical deployment; AEC-Q101 qualification adds reliability confidence.

Automotive Door Module Switching

Industrial Proximity Sensor Interface

Use Scenario: Driving small solenoids and LED indicators in vehicle door latch and window control units.

IC Role / Device Role / Timing Role: PNP switch controlling 12 V loads with microcontroller GPIO-level base drive.

Use Value: −32 V rating accommodates automotive load-dump transients; −0.3 V saturation minimizes self-heating during duty-cycled operation.

Use Scenario: Level-shifting and signal inversion between 3.3 V microcontrollers and 5 V/12 V proximity sensor outputs.

IC Role / Device Role / Timing Role: General-purpose PNP inverter stage translating logic states while providing current gain.

Use Value: 215–500 h_FE ensures robust drive capability across temperature; SOT-23 footprint saves space in compact sensor housings.

Consumer Audio Preamp Stage

Medical Patient Monitor Signal Conditioning

Use Scenario: Low-noise amplification of electret microphone signals in portable audio recorders.

IC Role / Device Role / Timing Role: Common-emitter amplifier biased in active region for voltage gain.

Use Value: ≤10 dB noise figure at 1 kHz and low C_obo preserve signal fidelity without requiring complex shielding.

Use Scenario: Isolating and buffering analog sensor outputs (e.g., temperature, pulse oximetry) before ADC sampling.

IC Role / Device Role / Timing Role: Emitter-follower buffer providing high input impedance and low output impedance.

Use Value: −55°C to +150°C operating range supports sterilization cycles and extended clinical deployment; AEC-Q101 qualification adds reliability confidence.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCW60LT1G	Higher h_FE (420–800), same V_CEO/I_C, identical SOT-23 package and pinout (Style 6).	Better suited for low-base-drive applications like high-side load switches with weak MCU outputs.	Select BCW60LT1G when higher current gain is required without layout change; verify thermal margin at same I_C.
MMBT3906LT1G	Same V_CEO (−40 V), slightly higher I_C (−200 mA), h_FE 100–300, identical SOT-23 pinout (Style 6).	Broader gain spread and higher max current support heavier loads but with less gain stability at low I_C.	Choose MMBT3906LT1G for higher current headroom; accept wider h_FE variation in precision biasing designs.

Compared with BCW30LT1, BCW60LT1G offers higher and tighter h_FE for improved base drive predictability, while MMBT3906LT1G trades gain consistency for greater current capacity - both retain pin-compatible SOT-23 packaging and PNP polarity for drop-in evaluation.

Availability

BCW30LT1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and consumer audio signal conditioning requiring stable component supply and long-term lifecycle support.

Supply support for BCW30LT1 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 is a global semiconductor supplier focused on energy-efficient electronics, delivering discrete, analog, and logic solutions for automotive, industrial, and cloud infrastructure markets.

The BCW30LT1 belongs to onsemi's general-purpose bipolar transistor family designed specifically for cost-sensitive, high-reliability signal switching and amplification in automotive and industrial environments.

FAQ

What is the maximum collector-emitter voltage rating for BCW30LT1?

The BCW30LT1 has a maximum collector-emitter voltage (V_CEO) rating of −32 Vdc, verified per onsemi's official datasheet Rev. 5 (November 2024). This rating applies under specified test conditions (I_C = −2.0 mAdc, I_E = 0) and defines the absolute upper limit for safe operation in negative-rail circuits. Exceeding this voltage risks irreversible breakdown and device failure.

Is BCW30LT1 suitable for automotive applications?

Yes, BCW30LT1 is AEC-Q101 qualified and PPAP capable, as explicitly stated in its onsemi datasheet. The "S" prefix variant (SBCW30LT1G) meets additional automotive site and control change requirements. Its −55°C to +150°C operating range, Pb-free construction, and validated reliability testing make BCW30LT1 appropriate for under-hood and cabin electronics such as door modules and lighting controls.

What is the DC current gain (h_FE) range for BCW30LT1 at typical operating conditions?

The BCW30LT1 exhibits a DC current gain (h_FE) range of 215 to 500 when tested at I_C = −2.0 mAdc and V_CE = −5.0 Vdc, per the Electrical Characteristics table in the official datasheet. This gain range remains stable across the full operating temperature range and supports consistent base resistor calculations in both switching and linear applications.

Does BCW30LT1 have a defined noise figure specification?

Yes, BCW30LT1 has a maximum noise figure (NF) of 10 dB, measured at I_C = −0.2 mAdc, V_CE = −5.0 Vdc, R_S = 2.0 kΩ, f = 1.0 kHz, and BW = 200 Hz. This value is confirmed in the datasheet's Electrical Characteristics section and supports BCW30LT1's use in low-noise preamplifier stages where signal integrity is critical.

What is the thermal resistance (R_JA) of BCW30LT1 on a standard FR-5 PCB?

The BCW30LT1 has a thermal resistance (R_JA) of 556 °C/W when mounted on an FR-5 board (1.0 × 0.75 × 0.062 in.), as specified in the Thermal Characteristics table. This value assumes TA = 25°C and includes derating of 1.8 mW/°C above that temperature - essential for calculating junction temperature rise under real-world power dissipation.

BCW30LT1 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:: -

BCW30LT1 FAQ

1.How can I place an order for BCW30LT1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCW30LT1 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 BCW30LT1 reliable?

The price and inventory of BCW30LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCW30LT1 is usually 5 days.

3.What payment methods are accepted for BCW30LT1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCW30LT1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCW30LT1?

BCW30LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCW30LT1 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 BCW30LT1?

For technical support, including BCW30LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCW30LT1 requirements.

6.How does Aetrix verify that BCW30LT1 is sourced from the original manufacturer or authorized distributors?

All BCW30LT1 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 BCW30LT1 meets industry standards.

7.What is the process for return or replacement of BCW30LT1?

All BCW30LT1 units undergo pre-shipment inspection (PSI). If there is an issue with BCW30LT1, 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 BCW30LT1 part is unused and in its original packaging.

Return procedure for BCW30LT1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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