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

onsemi BCW61CMTF

Name: BCW61CMTF
Brand: onsemi
SKU: BCW61CMTF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCW61CMTF

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BCW61CMTF.pdf

Description:: TRANS PNP 32V 0.1A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BCW61CMTF from ON Semiconductor (formerly Fairchild) is a PNP epitaxial silicon general-purpose transistor in SOT-23 package, rated for -32 V V_CEO, -100 mA I_C, and 350 mW P_C, commonly used in low-power switching and amplification circuits in consumer and industrial control systems.

For engineers reviewing the BCW61CMTF datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain (h_FE = 100–220 at I_C = -2 mA), V_CE(sat) ≤ -0.25 V at I_C = -10 mA, noise figure of 6 dB, and SOT-23 thermal and layout compatibility.

Technical Context

The BCW61CMTF operates as a medium-speed PNP bipolar junction transistor with defined breakdown limits (V_CBO = -32 V, V_EBO = -5.0 V) and low-noise performance (NF = 6 dB at 1 kHz). Its h_FE binning is specified across test conditions: 100–220 at V_CE = -5 V, I_C = -2 mA; 140–310 at I_C = -50 mA.

Switching behavior is characterized by t_ON = 150 ns and t_OFF = 800 ns under defined load and drive conditions. Output capacitance (C_ob = 6 pF at V_CB = -10 V, f = 1 MHz) supports stable operation in audio-frequency and low-speed digital interface stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-32 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration
I_C	-100 mA - Continuous collector current rating defining maximum linear or switching load capability
P_C	350 mW - Total power dissipation limit at T_A = 25°C, constraining thermal design in SOT-23
h_FE	100–220 - DC current gain range at V_CE = -5 V, I_C = -2 mA, enabling predictable base drive sizing
V_CE(sat)	≤ -0.25 V - Saturation voltage at I_C = -10 mA, I_B = -0.25 mA, minimizing conduction loss in switch mode
NF	6 dB - Noise figure at I_C = -0.2 mA, V_CE = -5 V, RG = 20 kΩ, 1 kHz, suitable for low-noise preamp stages
C_ob	6 pF - Output capacitance at V_CB = -10 V, f = 1 MHz, limiting high-frequency bandwidth and stability margin

Pinout & Package

SOT-23 plastic surface-mount package with gull-wing leads; standardized 3-pin footprint (1.90 mm × 1.30 mm body, 0.95 mm lead pitch); JEDEC MO-178 compliant.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased PNP operation; requires negative bias relative to emitter to enable conduction
2	Emitter	Current source terminal in PNP configuration; typically connected to higher potential rail in switching applications
3	Collector	Current sink terminal; output node where load is connected between collector and ground or lower potential

Key Features

Feature	Design Value
PNP polarity with -32 V rating	Enables high-side switching and complementary pair use with NPN transistors like BCW60 series
h_FE binning (BCW61C)	Guarantees minimum h_FE ≥ 100 at I_C = -2 mA, simplifying base resistor selection for consistent turn-on
V_CE(sat) ≤ -0.25 V	Reduces power loss and self-heating during saturated switching, critical for thermally constrained SOT-23 layouts
6 dB noise figure	Supports low-noise signal amplification in microphone preamps or sensor front-ends without added filtering complexity
150 ns turn-on time	Permits reliable operation in pulse-width modulation (PWM) control up to ~2 MHz with adequate drive strength

Applications

Audio Signal Amplification	Low-Voltage Switching Control
Use Scenario: Amplifying weak analog signals from electret microphones or piezoelectric sensors in battery-powered voice recorders. IC Role / Device Role / Timing Role: PNP small-signal amplifier configured in common-emitter topology with fixed bias network. Use Value: 6 dB noise figure and h_FE ≥ 100 ensure clean gain without introducing audible hiss or requiring complex feedback compensation.	Use Scenario: Driving LED indicators or small relays from 3.3 V or 5 V microcontroller GPIO pins in industrial HMIs. IC Role / Device Role / Timing Role: Low-side or high-side switch controlling current path to load via saturated PNP operation. Use Value: V_CE(sat) ≤ -0.25 V at I_C = -10 mA minimizes voltage drop and heat generation in compact SOT-23 PCB footprints.
Complementary Pair Biasing	Signal Level Translation
Use Scenario: Forming Class AB output stages with matched NPN counterparts (e.g., BCW60C) in miniature audio amplifiers. IC Role / Device Role / Timing Role: PNP half of complementary emitter-follower pair providing symmetrical sourcing/sinking capability. Use Value: Matched V_CEO (-32 V), I_C (-100 mA), and h_FE binning enable balanced crossover distortion reduction.	Use Scenario: Shifting logic levels between 5 V and 3.3 V domains in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Active pull-up stage converting open-drain or TTL outputs to CMOS-compatible high-level signals. Use Value: Fast t_ON/t_OFF (150/800 ns) and low C_ob (6 pF) preserve edge integrity up to 1–2 MHz data rates.

Audio Signal Amplification

Low-Voltage Switching Control

Use Scenario: Amplifying weak analog signals from electret microphones or piezoelectric sensors in battery-powered voice recorders.

IC Role / Device Role / Timing Role: PNP small-signal amplifier configured in common-emitter topology with fixed bias network.

Use Value: 6 dB noise figure and h_FE ≥ 100 ensure clean gain without introducing audible hiss or requiring complex feedback compensation.

Use Scenario: Driving LED indicators or small relays from 3.3 V or 5 V microcontroller GPIO pins in industrial HMIs.

IC Role / Device Role / Timing Role: Low-side or high-side switch controlling current path to load via saturated PNP operation.

Use Value: V_CE(sat) ≤ -0.25 V at I_C = -10 mA minimizes voltage drop and heat generation in compact SOT-23 PCB footprints.

Complementary Pair Biasing

Signal Level Translation

Use Scenario: Forming Class AB output stages with matched NPN counterparts (e.g., BCW60C) in miniature audio amplifiers.

IC Role / Device Role / Timing Role: PNP half of complementary emitter-follower pair providing symmetrical sourcing/sinking capability.

Use Value: Matched V_CEO (-32 V), I_C (-100 mA), and h_FE binning enable balanced crossover distortion reduction.

Use Scenario: Shifting logic levels between 5 V and 3.3 V domains in mixed-voltage embedded systems.

IC Role / Device Role / Timing Role: Active pull-up stage converting open-drain or TTL outputs to CMOS-compatible high-level signals.

Use Value: Fast t_ON/t_OFF (150/800 ns) and low C_ob (6 pF) preserve edge integrity up to 1–2 MHz data rates.

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
BC856B,115	Higher h_FE (220–450), same SOT-23, V_CEO = -65 V, P_C = 250 mW	Better gain consistency at low I_C; lower power rating limits high-current switching	Select when higher DC gain and improved voltage margin are prioritized over power handling
MMBT4403	V_CEO = -40 V, h_FE = 100–300, P_C = 350 mW, same pinout	Wider V_CEO margin and broader h_FE range support more aggressive supply rails and variable loads	Preferred for designs requiring extended voltage headroom without changing layout or drive circuitry

Compared with BCW61CMTF, BC856B,115 offers superior gain and voltage rating but reduced power dissipation, while MMBT4403 provides identical thermal capability with enhanced breakdown safety-both require verification of h_FE distribution and saturation behavior in target operating points.

Availability

BCW61CMTF is available at Aetrix Electronics and suitable for low-power switching, analog amplification, and level translation applications requiring stable component supply, consistent h_FE binning, and SOT-23 footprint compatibility.

Supply support for BCW61CMTF 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

ON Semiconductor is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, and IoT applications.

The BCW61CMTF belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, designed for cost-sensitive, space-constrained applications demanding reliable DC amplification and switching in consumer electronics and industrial controls.

FAQ

What is the maximum collector-emitter voltage rating for BCW61CMTF?

The BCW61CMTF has a maximum collector-emitter voltage (V_CEO) rating of -32 V at T_A = 25°C. This rating defines the upper limit of reverse bias that can be safely applied between collector and emitter with the base open. Exceeding this value risks avalanche breakdown and permanent device damage. The BCW61CMTF must be operated within this absolute maximum to ensure reliability in circuits such as high-side switches or amplifier stages.

What is the typical DC current gain (h_FE) range for BCW61CMTF?

The BCW61CMTF is binned as the 'C' variant, specifying h_FE = 100–220 at V_CE = -5 V and I_C = -2 mA. At higher currents (I_C = -50 mA), h_FE ranges from 140 to 310. This gain range enables predictable base drive design for both linear amplification and saturated switching. The BCW61CMTF's h_FE bin ensures consistent performance across production lots without requiring individual calibration.

Does BCW61CMTF have a specified noise figure, and under what conditions?

Yes, the BCW61CMTF has a specified noise figure of 6 dB, measured at I_C = -0.2 mA, V_CE = -5 V, R_G = 20 kΩ, and f = 1 kHz. This value reflects its suitability for low-noise small-signal amplification tasks, such as microphone preamplifiers or sensor signal conditioning. The BCW61CMTF's noise performance is stable across its qualified operating range and is not extrapolated from other variants or package types.

What is the pin configuration of BCW61CMTF, and how is it oriented on the PCB?

The BCW61CMTF uses the standard SOT-23 package with pin 1 (Base) at the left when the marking side faces up and the tab (or notch) is oriented toward the viewer's left. Pin 2 is Emitter, and pin 3 is Collector. This 1-2-3 left-to-right layout matches JEDEC MO-178 and is identical to BCW60, BC856, and MMBT4403. Correct orientation is essential for functional operation, as reversing the emitter and collector will prevent proper PNP conduction in the BCW61CMTF.

Can BCW61CMTF be used as a direct replacement for BCW61B or BCW61D in existing designs?

No-BCW61CMTF is not a direct replacement for BCW61B or BCW61D due to differences in h_FE binning: BCW61B specifies h_FE = 40–120, while BCW61D specifies 250–630. Substituting BCW61CMTF (100–220) may alter base drive requirements, saturation behavior, or amplifier gain. The BCW61CMTF should only replace BCW61C-marked units. Always verify bias point stability and switching timing when interchanging variants, even within the same BCW61 family.

BCW61CMTF 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:: PNP

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 32 V

Vce Saturation (Max) @ Ib, Ic:: 550mV @ 1.25mA, 50mA

Current - Collector Cutoff (Max):: 20nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 250 @ 2mA, 5V

Power - Max:: 350 mW

Frequency - Transition:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BCW61CMTF FAQ

1.How can I place an order for BCW61CMTF through Aetrix?

Please submit a Request for Quotation (RFQ) for BCW61CMTF 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 BCW61CMTF reliable?

The price and inventory of BCW61CMTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCW61CMTF is usually 5 days.

3.What payment methods are accepted for BCW61CMTF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCW61CMTF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCW61CMTF?

BCW61CMTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCW61CMTF 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 BCW61CMTF?

For technical support, including BCW61CMTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCW61CMTF requirements.

6.How does Aetrix verify that BCW61CMTF is sourced from the original manufacturer or authorized distributors?

All BCW61CMTF 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 BCW61CMTF meets industry standards.

7.What is the process for return or replacement of BCW61CMTF?

All BCW61CMTF units undergo pre-shipment inspection (PSI). If there is an issue with BCW61CMTF, 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 BCW61CMTF part is unused and in its original packaging.

Return procedure for BCW61CMTF:

1.Submit a request within 90 days.

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

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