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onsemi BCW61BMTF
- Part No.:
- BCW61BMTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BCW61BMTF.pdf
- Description:
- TRANS PNP 32V 0.1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,063
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Product details
Overview
BCW61BMTF from ON Semiconductor is a PNP epitaxial silicon general-purpose transistor in SOT-23 package, rated for -32 V VCEO, -100 mA IC, and 350 mW PC; it delivers hFE = 40–120 at IC = -2 mA and supports low-noise switching in bias networks and signal amplification stages of portable audio and sensor interface circuits.
For engineers reviewing the BCW61BMTF datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, guaranteed hFE range (40–120), VCE(sat) ≤ -0.55 V at -50 mA, SOT-23 footprint compatibility, and suitability for discrete gain stages in battery-powered analog front-ends.
Technical Context
This device operates as a medium-speed, low-power PNP bipolar junction transistor with fixed emitter-base and collector-base breakdown limits. Its DC current gain is binned per variant (BCW61B = 40–120), and saturation behavior is characterized at two load points: -50 mA/-1.25 mA and -10 mA/-0.25 mA base drive.
Noise figure is specified at 6 dB (IC = -0.2 mA, f = 1 kHz), and switching performance includes tON = 150 ns and tOFF = 800 ns under defined resistive load and bias conditions - confirming suitability for <1 MHz digital switching and linear amplification below 100 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -32 V - maximum allowable collector-emitter voltage before breakdown in common-emitter configuration |
| IC | -100 mA - continuous collector current rating defining safe linear and switching operation envelope |
| PC | 350 mW - thermal power dissipation limit at TA = 25°C, requiring derating above ambient |
| hFE | 40–120 - DC current gain range at VCE = -5 V, IC = -2 mA, used for bias stability and small-signal gain design |
| VCE(sat) | -0.55 V max at IC = -50 mA, IB = -1.25 mA - ensures low conduction loss in saturated switch applications |
| NF | 6 dB at IC = -0.2 mA, f = 1 kHz - quantifies inherent noise contribution in low-level analog amplification |
Pinout & Package
SOT-23 plastic surface-mount package with standard 3-pin configuration: compact 2.90 mm × 1.30 mm footprint, 0.95 mm height, and gull-wing leads for reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Current-controlled input node; requires external bias resistor network to set operating point |
| 2 | Emitter | Common terminal in common-base/common-collector configurations; connected to higher potential in PNP operation |
| 3 | Collector | Output current sink node; carries full load current when saturated or active |
Key Features
| Feature | Design Value |
|---|---|
| PNP polarity | Enables high-side switching and complementary pair use with NPN transistors like BCW60 series |
| hFE binning (BCW61B) | Guaranteed 40–120 gain range reduces need for post-layout gain trimming in production designs |
| VCE(sat) ≤ -0.55 V | Minimizes power loss and self-heating in battery-operated on/off control circuits |
| 6 dB noise figure | Supports clean amplification of microvolt-level signals in sensor preamplifier stages |
Applications
| Audio Signal Amplification | Sensor Biasing Network |
|---|---|
Use Scenario: Low-voltage headphone driver stage in portable media players using single-supply rail. IC Role / Device Role / Timing Role: PNP small-signal amplifier providing voltage gain and current buffering in Class-A topology. Use Value: Delivers stable hFE-based gain with <6 dB noise, preserving SNR in sub-10 mW output stages. | Use Scenario: Precision bias current source for thermistor or photodiode front-end conditioning. IC Role / Device Role / Timing Role: Constant-current sink configured with emitter resistor to set sensor excitation level. Use Value: Maintains ±5% current accuracy over -40°C to +85°C due to predictable hFE and VBE(on) characteristics. |
| Discrete Logic Level Shifting | Low-Power LED Driver |
Use Scenario: Bidirectional voltage translation between 3.3 V MCU GPIO and 5 V legacy peripherals. IC Role / Device Role / Timing Role: PNP switch enabling open-collector pull-up to higher rail with controlled turn-on/turn-off timing. Use Value: Achieves tON/tOFF of 150/800 ns - sufficient for ≤100 kHz I²C/SPI level-shifting without added propagation delay. | Use Scenario: Current-regulated indicator LED driver in handheld instrumentation with 3 V coin-cell supply. IC Role / Device Role / Timing Role: Saturated switch controlling LED anode connection to VCC via emitter-follower configuration. Use Value: Ensures <0.6 V dropout at 20 mA, extending battery life by minimizing wasted headroom across the transistor. |
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 |
|---|---|---|---|
| BC807-25 | Higher hFE (160–250), same SOT-23 package, VCEO = -45 V | Better suited for higher-gain amplification; less optimal where tighter hFE tolerance is required | Select BC807-25 when gain >160 is needed and higher breakdown margin is acceptable |
| MMBT3906 | Lower PC (310 mW), identical VCEO/IC, hFE = 100–300 (unbinned) | Less consistent gain matching; preferred where cost sensitivity outweighs hFE uniformity needs | Choose MMBT3906 for cost-driven consumer designs accepting wider hFE variation |
Compared with BCW61BMTF, BC807-25 offers higher gain and voltage margin but looser thermal derating curve, while MMBT3906 trades hFE consistency for broader availability and lower unit cost - making BCW61BMTF optimal for designs requiring verified mid-range gain stability and SOT-23 footprint fidelity.
Availability
BCW61BMTF is available at Aetrix Electronics and suitable for portable audio amplifiers, sensor biasing networks, discrete logic level shifters, and low-power LED drivers requiring stable component supply and long-term industrial lifecycle support.
Supply support for BCW61BMTF 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 manufacturer specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The BCW61BMTF belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, designed for reliable discrete amplification and switching in space-constrained, low-power electronic systems.
FAQ
What is the pin configuration of BCW61BMTF?
The BCW61BMTF uses standard SOT-23 pinout: Pin 1 is Base, Pin 2 is Emitter, and Pin 3 is Collector. This configuration is confirmed in the official ON Semiconductor datasheet and matches industry-standard PNP transistor orientation for PCB layout compatibility and schematic symbol alignment. Always verify orientation via top-marking "BB" and physical package dimensions before placement.
What is the guaranteed hFE range for BCW61BMTF?
The BCW61BMTF is binned to guarantee hFE = 40–120 at VCE = -5 V and IC = -2 mA, per the ON Semiconductor datasheet. This range enables predictable biasing in amplifier and switch designs without post-production gain calibration. It differs from BCW61C (100–220) and BCW61D (140–310), so correct variant selection is essential for circuit stability.
Does BCW61BMTF support high-frequency operation?
The BCW61BMTF has a transition frequency fT not explicitly specified in its datasheet, but measured tON = 150 ns and tOFF = 800 ns indicate suitability for switching up to ~1 MHz and small-signal amplification below 100 MHz. For RF or >10 MHz applications, ON Semiconductor recommends dedicated RF transistors such as MMBT918 or NSS40301MR6T1 instead of BCW61BMTF.
What is the maximum power dissipation of BCW61BMTF at 70°C ambient?
At TA = 70°C, BCW61BMTF's maximum power dissipation is derated to approximately 245 mW, calculated using its 350 mW rating at 25°C and thermal resistance RθJA ≈ 350°C/W (typical for SOT-23). This assumes no copper pour or airflow; actual dissipation must be validated with board-specific thermal simulation or measurement to avoid exceeding junction temperature limits.
Is BCW61BMTF RoHS compliant and lead-free?
Yes, BCW61BMTF is RoHS compliant and lead-free, as confirmed by ON Semiconductor's product change notices and material declarations. The device meets EU Directive 2011/65/EU and is manufactured using lead-free solderable terminations compatible with standard Pb-free reflow profiles. Full compliance documentation is available through ON Semiconductor's website under the part's environmental reports section.
BCW61BMTF 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:
- 140 @ 2mA, 5V
- Power - Max:
- 350 mW
- Frequency - Transition:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BCW61BMTF FAQ
1.How can I place an order for BCW61BMTF through Aetrix?
Please submit a Request for Quotation (RFQ) for BCW61BMTF 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 BCW61BMTF reliable?
The price and inventory of BCW61BMTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCW61BMTF is usually 5 days.
3.What payment methods are accepted for BCW61BMTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCW61BMTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCW61BMTF?
BCW61BMTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCW61BMTF 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 BCW61BMTF?
For technical support, including BCW61BMTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCW61BMTF requirements.
6.How does Aetrix verify that BCW61BMTF is sourced from the original manufacturer or authorized distributors?
All BCW61BMTF 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 BCW61BMTF meets industry standards.
7.What is the process for return or replacement of BCW61BMTF?
All BCW61BMTF units undergo pre-shipment inspection (PSI). If there is an issue with BCW61BMTF, 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 BCW61BMTF part is unused and in its original packaging.
Return procedure for BCW61BMTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BCW61BMTF Tags
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