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

onsemi BCW89

Name: BCW89
Brand: onsemi
SKU: BCW89
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCW89

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BCW89.pdf

Description:: TRANS PNP 60V 0.5A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BCW89 from ON Semiconductor is a PNP general-purpose amplifier transistor in SOT-23 package, rated for -60 V V_CEO, -500 mA continuous collector current, and 350 mW power dissipation at 25°C. It delivers DC current gain (h_FE) of 120–260 at -2 mA collector current and exhibits low V_CE(sat) of -0.3 V at -10 mA/-0.5 mA drive, suitable for medium-power switching and amplification in consumer power supplies.

For engineers reviewing the BCW89 datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP polarity, SOT-23 footprint compatibility, -60 V breakdown rating, thermal resistance of 357 °C/W, and noise figure of 10 dB at 1 kHz - all critical for discrete analog stage design and BOM validation.

Technical Context

The BCW89 is a silicon planar epitaxial PNP bipolar junction transistor optimized for medium-power linear amplification and saturated switching. Its process-68 fabrication ensures consistent h_FE spread and low V_BE(on) (-0.6 to -0.75 V), enabling predictable base drive requirements in emitter-follower and common-emitter configurations.

Designed for operation up to +150°C junction temperature, it supports stable performance across industrial ambient ranges. The device's -100 nA ICBO at 25°C and -10 µA at +100°C confirms low leakage suitability for battery-powered signal conditioning and standby control circuits where quiescent current matters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-60 V - Maximum safe collector-emitter voltage before avalanche breakdown in open-base configuration.
I_C (continuous)	-500 mA - Continuous collector current limit defining usable output drive capability in switching applications.
P_D @ 25°C	350 mW - Total power dissipation limit at room temperature; derates 2.8 mW/°C above 25°C.
h_FE	120–260 - DC current gain range at V_CE = -5 V, I_C = -2 mA; determines required base current for target collector load.
V_CE(sat)	-0.3 V - Saturation voltage at I_C = -10 mA, I_B = -0.5 mA; defines conduction loss and minimum output swing in switch mode.
R_θJA	357 °C/W - Junction-to-ambient thermal resistance in free-air; used to calculate max junction temp under real PCB layout conditions.

Pinout & Package

SOT-23 plastic surface-mount package with standard 3-pin configuration and marking code "H3". Lead-free and RoHS-compliant per ON Semiconductor specifications.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased PNP operation; requires negative bias relative to emitter to turn on.
2	Emitter	Current source terminal in PNP topology; typically connected to higher potential rail in common-emitter switches.
3	Collector	Output current sink terminal; connects to load and lower-potential node in amplification or switching paths.

Key Features

Feature	Design Value
PNP polarity with high V_CEO	Enables high-side switching and complementary pair use with NPN devices like BCW66 in push-pull stages.
Low V_CE(sat) at moderate current	Reduces conduction loss in 5–12 V logic-level switching applications such as LED drivers and relay coils.
Controlled h_FE range (120–260)	Supports predictable base resistor calculation without overdesigning drive circuitry for consistent turn-on behavior.
350 mW power rating in SOT-23	Provides higher dissipation than standard small-signal transistors (e.g., BC856), enabling use in medium-power analog stages.

Applications

Audio Pre-amplifier Stage	DC-DC Converter Feedback Loop
Use Scenario: Low-noise voltage amplification in portable audio line-input buffers operating from single 9 V supply. IC Role / Device Role / Timing Role: PNP small-signal amplifier configured in common-emitter topology with emitter degeneration. Use Value: 10 dB noise figure at 1 kHz and stable h_FE ensure minimal added distortion and repeatable gain setting across production units.	Use Scenario: Error amplifier transistor in isolated flyback converter feedback path interfacing optocoupler output. IC Role / Device Role / Timing Role: Linear current sink controlling optocoupler LED anode current based on secondary-side error voltage. Use Value: -60 V V_CEO withstands transient spikes on auxiliary winding; low ICBO prevents false triggering during light-load conditions.
Industrial Sensor Interface	Power Supply Enable Switch
Use Scenario: Current-source driver for 4–20 mA loop transmitter using two-wire passive sensor elements. IC Role / Device Role / Timing Role: PNP constant-current source with emitter-follower configuration regulating loop current. Use Value: Tight h_FE tolerance and -500 mA I_C rating support full-range 20 mA compliance voltage up to 30 V.	Use Scenario: High-side enable switch controlling 5 V rail to microcontroller peripherals in battery-backed systems. IC Role / Device Role / Timing Role: Saturated PNP switch turning on/off V_CC path with base driven by GPIO through current-limiting resistor. Use Value: -0.3 V V_CE(sat) minimizes dropout voltage; SOT-23 footprint allows compact placement near load ICs.

Audio Pre-amplifier Stage

DC-DC Converter Feedback Loop

Use Scenario: Low-noise voltage amplification in portable audio line-input buffers operating from single 9 V supply.

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

Use Value: 10 dB noise figure at 1 kHz and stable h_FE ensure minimal added distortion and repeatable gain setting across production units.

Use Scenario: Error amplifier transistor in isolated flyback converter feedback path interfacing optocoupler output.

IC Role / Device Role / Timing Role: Linear current sink controlling optocoupler LED anode current based on secondary-side error voltage.

Use Value: -60 V V_CEO withstands transient spikes on auxiliary winding; low ICBO prevents false triggering during light-load conditions.

Industrial Sensor Interface

Power Supply Enable Switch

Use Scenario: Current-source driver for 4–20 mA loop transmitter using two-wire passive sensor elements.

IC Role / Device Role / Timing Role: PNP constant-current source with emitter-follower configuration regulating loop current.

Use Value: Tight h_FE tolerance and -500 mA I_C rating support full-range 20 mA compliance voltage up to 30 V.

Use Scenario: High-side enable switch controlling 5 V rail to microcontroller peripherals in battery-backed systems.

IC Role / Device Role / Timing Role: Saturated PNP switch turning on/off V_CC path with base driven by GPIO through current-limiting resistor.

Use Value: -0.3 V V_CE(sat) minimizes dropout voltage; SOT-23 footprint allows compact placement near load ICs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC857B	Lower V_CEO (-45 V), same SOT-23 package, h_FE 200–450, higher gain spread.	Not suitable for >45 V rail applications; better for low-voltage logic interface where tighter gain isn't critical.	Select BC857B only if system voltage stays ≤45 V and higher h_FE simplifies base drive design.
MMBT3906	Same V_CEO (-40 V), lower I_C (-200 mA), higher R_θJA (400 °C/W), identical pinout.	Limited to ≤200 mA loads; less thermally robust in sustained conduction; widely stocked but lower power capability.	Choose MMBT3906 only for low-current signal switching where BCW89's 500 mA headroom is unnecessary.

Compared with BC857B and MMBT3906, the BCW89 provides superior voltage margin (-60 V), higher current capacity (-500 mA), and lower thermal resistance (357 °C/W), making it the preferred choice for industrial 24 V systems and medium-power analog stages requiring reliability under sustained load.

Availability

BCW89 is available at Aetrix Electronics and suitable for industrial sensor interfaces, DC-DC converter feedback loops, audio pre-amplifier stages, and power supply enable switches requiring stable component supply and long-term obsolescence management.

Supply support for BCW89 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 consumer markets.

The BCW89 belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, originally developed by Fairchild and optimized for cost-sensitive, medium-power discrete amplification and switching in non-critical industrial and consumer electronics.

FAQ

What is the maximum collector-emitter voltage rating for BCW89?

The BCW89 has a maximum collector-emitter voltage rating (V_CEO) of -60 V at T_C = 25°C. This rating applies under open-base conditions with I_B = 0, and reflects the device's ability to block reverse voltage in PNP configurations. Exceeding this value risks avalanche breakdown and permanent damage. Always verify operating margins against worst-case system transients when using BCW89 in real designs.

Does BCW89 have a documented pinout configuration for SOT-23 package?

Yes, BCW89 uses standard SOT-23 pinout: Pin 1 is Base, Pin 2 is Emitter, Pin 3 is Collector - confirmed in the original Fairchild datasheet and maintained in ON Semiconductor's documentation. The device is marked "H3" on the package top surface. This pin assignment is consistent across all BCW89 production lots and must be observed to avoid reverse-bias damage during PCB layout and assembly.

What is the typical DC current gain (hFE) range for BCW89 at standard test conditions?

The BCW89 exhibits a DC current gain (h_FE) range of 120 to 260 when measured at V_CE = -5.0 V and I_C = -2.0 mA. This specified min/max spread is guaranteed across production, enabling reliable base resistor selection for both switching and linear applications. Do not assume typical values - always design for the minimum h_FE (120) to ensure proper saturation or amplification under worst-case conditions.

Can BCW89 be used in high-frequency amplifier circuits?

No, BCW89 is not intended for high-frequency amplification. Its datasheet does not specify f_T or transition frequency, and its noise figure (10 dB at 1 kHz) and lack of RF characterization confirm it is optimized for audio and low-speed switching - not RF or broadband applications. For frequencies above 100 kHz, consider purpose-built RF transistors such as MMBTH10 or BF199 instead of BCW89.

Is BCW89 RoHS-compliant and lead-free?

Yes, BCW89 is RoHS-compliant and lead-free per ON Semiconductor's product change notifications and packaging specifications. The SOT-23 package uses matte tin (Sn) lead finish, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements. Full compliance documentation, including substance declarations and test reports, is available via ON Semiconductor's quality portal for BCW89.

BCW89 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):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 500µA, 10mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 120 @ 2mA, 5V

Power - Max:: 350 mW

Frequency - Transition:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BCW89 FAQ

1.How can I place an order for BCW89 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCW89 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 BCW89 reliable?

The price and inventory of BCW89 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCW89 is usually 5 days.

3.What payment methods are accepted for BCW89?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCW89 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCW89?

BCW89 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCW89 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 BCW89?

For technical support, including BCW89 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCW89 requirements.

6.How does Aetrix verify that BCW89 is sourced from the original manufacturer or authorized distributors?

All BCW89 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 BCW89 meets industry standards.

7.What is the process for return or replacement of BCW89?

All BCW89 units undergo pre-shipment inspection (PSI). If there is an issue with BCW89, 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 BCW89 part is unused and in its original packaging.

Return procedure for BCW89:

1.Submit a request within 90 days.

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

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