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

onsemi BCW61AMTF

Name: BCW61AMTF
Brand: onsemi
SKU: BCW61AMTF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCW61AMTF

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BCW61AMTF.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BCW61AMTF 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 modules.

For engineers reviewing the BCW61AMTF datasheet, pinout, applications, or equivalent options, key selection criteria include its verified -32 V breakdown voltage, h_FE range of 60–120 at I_C = -2 mA, V_CE(sat) ≤ -0.25 V at I_C = -10 mA, noise figure of 6 dB, and SOT-23 footprint compatibility.

Technical Context

This PNP bipolar junction transistor operates with emitter-base forward bias and collector-base reverse bias, supporting linear amplification and saturated switching modes. Its DC current gain (h_FE) is specified at multiple operating points: min 60 at I_C = -2 mA, min 80 at I_C = -2 mA (BCW61B), and min 100 at I_C = -50 mA (BCW61C/D), confirming graded gain variants within the family.

Switching performance is characterized by t_ON = 150 ns and t_OFF = 800 ns under defined test conditions, with Cob = 6 pF at V_CB = -10 V and f = 1 MHz, indicating suitability for low-frequency signal routing and digital logic interfacing up to ~1 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-32 V - Maximum safe collector-emitter voltage before avalanche breakdown
I_C	-100 mA - Continuous collector current rating defining maximum load drive capability
P_C	350 mW - Power dissipation limit at T_A = 25°C, constraining thermal design in SOT-23
h_FE	60–120 - DC current gain range at V_CE = -5 V, I_C = -2 mA, enabling predictable base drive sizing
V_CE(sat)	≤ -0.25 V - Low saturation voltage at I_C = -10 mA / I_B = -0.25 mA, minimizing conduction loss in switch mode
C_ob	6 pF - Output capacitance at V_CB = -10 V, limiting high-frequency bandwidth and rise/fall edge speed
NF	6 dB - Noise figure at I_C = -0.2 mA, V_CE = -5 V, RG = 20 kΩ, f = 1 kHz, relevant for low-level analog preamplifiers

Pinout & Package

SOT-23 plastic surface-mount package with gull-wing leads; compact 2.90 mm × 1.30 mm footprint, 0.95 mm height, and standard JEDEC MO-178 alignment.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Current-controlled input node; requires external resistor bias network to set operating point
2	Emitter	Common terminal for PNP configuration; connected to higher potential rail in typical switch topology
3	Collector	Output current path; sinks current when transistor is active, referenced to load return

Key Features

Feature	Design Value
PNP polarity	Enables high-side switching and complementary pair use with NPN transistors like BCW60A
SOT-23 package	Supports automated pick-and-place assembly and space-constrained PCB layouts
V_EBO = -5.0 V	Allows safe base-emitter reverse bias up to -5 V, accommodating transient protection or level-shifting circuits
t_ON/t_OFF = 150/800 ns	Validates use in digital logic buffering and moderate-speed pulse generation (≤1 MHz)

Applications

LED Driver Circuit	Level-Shifting Interface
Use Scenario: Driving low-current indicator LEDs from microcontroller GPIO pins with voltage rail above MCU logic level. IC Role / Device Role / Timing Role: PNP switch controlling LED anode connection to positive supply while sinking current through cathode. Use Value: V_CE(sat) ≤ -0.25 V ensures minimal voltage drop across transistor, preserving LED forward voltage margin and brightness consistency.	Use Scenario: Translating 3.3 V logic signals to 5 V or 12 V domains in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Active-low level shifter using emitter-follower or common-emitter inversion configuration. Use Value: Verified h_FE ≥ 60 at low I_C enables reliable switching with minimal base drive current, reducing MCU pin loading.
Low-Power Audio Preamp	Relay Driver Stage
Use Scenario: First-stage amplification of microphone or sensor signals in battery-powered audio front-ends. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with fixed bias network and emitter degeneration. Use Value: NF = 6 dB at 1 kHz supports acceptable signal-to-noise ratio for voice-band applications without requiring ultra-low-noise alternatives.	Use Scenario: Interfacing microcontroller outputs to electromechanical relays requiring >10 mA coil current. IC Role / Device Role / Timing Role: Saturated switch providing galvanic isolation between logic and power side. Use Value: I_C = -100 mA rating and P_C = 350 mW allow continuous relay coil drive without thermal derating in ambient < 60°C.

LED Driver Circuit

Level-Shifting Interface

Use Scenario: Driving low-current indicator LEDs from microcontroller GPIO pins with voltage rail above MCU logic level.

IC Role / Device Role / Timing Role: PNP switch controlling LED anode connection to positive supply while sinking current through cathode.

Use Value: V_CE(sat) ≤ -0.25 V ensures minimal voltage drop across transistor, preserving LED forward voltage margin and brightness consistency.

Use Scenario: Translating 3.3 V logic signals to 5 V or 12 V domains in mixed-voltage embedded systems.

IC Role / Device Role / Timing Role: Active-low level shifter using emitter-follower or common-emitter inversion configuration.

Use Value: Verified h_FE ≥ 60 at low I_C enables reliable switching with minimal base drive current, reducing MCU pin loading.

Low-Power Audio Preamp

Relay Driver Stage

Use Scenario: First-stage amplification of microphone or sensor signals in battery-powered audio front-ends.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with fixed bias network and emitter degeneration.

Use Value: NF = 6 dB at 1 kHz supports acceptable signal-to-noise ratio for voice-band applications without requiring ultra-low-noise alternatives.

Use Scenario: Interfacing microcontroller outputs to electromechanical relays requiring >10 mA coil current.

IC Role / Device Role / Timing Role: Saturated switch providing galvanic isolation between logic and power side.

Use Value: I_C = -100 mA rating and P_C = 350 mW allow continuous relay coil drive without thermal derating in ambient < 60°C.

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
BCW60AMTF	NPN complement; identical SOT-23 package, matching V_CEO/I_C/P_C, but opposite polarity	Used where low-side switching or NPN-based amplifier topologies are required	Select BCW60AMTF when circuit architecture demands NPN operation or complementary pairing
MMBT3906LT1G	Same PNP polarity, SOT-23, V_CEO = -40 V, I_C = -200 mA, h_FE min 100 at I_C = -10 mA	Higher voltage/current headroom; preferred in designs requiring extended margin or higher gain stability	Choose MMBT3906LT1G when V_CEO > -32 V or I_C > -100 mA is needed, or tighter h_FE distribution is critical

Compared with BCW61AMTF, BCW60AMTF serves as a polarity-matched counterpart for push-pull stages, while MMBT3906LT1G offers enhanced voltage rating and current capacity-making it suitable for upgraded reliability or higher-load applications without changing PCB layout.

Availability

BCW61AMTF is available at Aetrix Electronics and suitable for LED driver circuits, level-shifting interfaces, low-power audio preamplifiers, and relay driver stages requiring stable component supply and long-term industrial availability.

Supply support for BCW61AMTF 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, medical, and IoT applications.

The BCW61AMTF belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, designed for cost-sensitive, low-power discrete switching and amplification in consumer electronics and industrial controls.

FAQ

What is the absolute maximum collector-emitter voltage for BCW61AMTF?

The absolute maximum collector-emitter voltage (V_CEO) for BCW61AMTF is -32 V at T_A = 25°C. This rating defines the upper limit of reverse bias the transistor can withstand before breakdown occurs. Exceeding this value risks permanent damage. The BCW61AMTF datasheet specifies this parameter under standard test conditions with I_B = 0, and it applies directly to the BCW61AMTF device in its SOT-23 package.

What is the DC current gain (h_FE) range of BCW61AMTF at I_C = -2 mA?

The BCW61AMTF exhibits a minimum h_FE of 60 and a maximum of 120 when tested at V_CE = -5 V and I_C = -2 mA. This gain range is confirmed in the Fairchild (now ON Semiconductor) BCW61A/B/C/D datasheet Rev. A1. Designers must account for this spread when sizing base resistors for consistent switching or amplification behavior in the BCW61AMTF circuit implementation.

Is BCW61AMTF pin-compatible with BCW60AMTF?

No, BCW61AMTF is not pin-compatible with BCW60AMTF in functional circuit placement, though both share the SOT-23 package and identical pin numbering (1=Base, 2=Emitter, 3=Collector). BCW60AMTF is an NPN transistor, so its terminal polarities and biasing requirements differ fundamentally. Swapping BCW61AMTF for BCW60AMTF without circuit redesign will result in non-operation or damage. Always verify polarity and bias topology before substitution involving BCW61AMTF.

What is the typical output capacitance (C_ob) of BCW61AMTF and how does it affect circuit performance?

The typical output capacitance (C_ob) of BCW61AMTF is 6 pF, measured at V_CB = -10 V and f = 1 MHz. This capacitance appears between collector and base, influencing high-frequency response and switching speed. In digital switching applications, C_ob contributes to Miller effect delays; in RF or fast-switching designs, it may limit usable bandwidth. The BCW61AMTF's 6 pF value confirms suitability for sub-MHz signal paths but not RF amplification.

Does BCW61AMTF have a specified noise figure, and what is its relevance?

Yes, BCW61AMTF has a specified noise figure (NF) of 6 dB, measured at I_C = -0.2 mA, V_CE = -5 V, R_G = 20 kΩ, and f = 1 kHz. This value quantifies added noise in low-level analog amplification stages. For BCW61AMTF used in microphone preamps or sensor signal conditioning, a 6 dB NF supports adequate signal integrity in voice-band applications but does not qualify it for ultra-low-noise instrumentation-grade designs.

BCW61AMTF 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:: 120 @ 2mA, 5V

Power - Max:: 350 mW

Frequency - Transition:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BCW61AMTF FAQ

1.How can I place an order for BCW61AMTF through Aetrix?

Please submit a Request for Quotation (RFQ) for BCW61AMTF 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 BCW61AMTF reliable?

The price and inventory of BCW61AMTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCW61AMTF is usually 5 days.

3.What payment methods are accepted for BCW61AMTF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCW61AMTF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCW61AMTF?

BCW61AMTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCW61AMTF 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 BCW61AMTF?

For technical support, including BCW61AMTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCW61AMTF requirements.

6.How does Aetrix verify that BCW61AMTF is sourced from the original manufacturer or authorized distributors?

All BCW61AMTF 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 BCW61AMTF meets industry standards.

7.What is the process for return or replacement of BCW61AMTF?

All BCW61AMTF units undergo pre-shipment inspection (PSI). If there is an issue with BCW61AMTF, 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 BCW61AMTF part is unused and in its original packaging.

Return procedure for BCW61AMTF:

1.Submit a request within 90 days.

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

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