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

onsemi BC184_D27Z

Name: BC184_D27Z
Brand: onsemi
SKU: BC184_D27Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC184_D27Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: BC184_D27Z.pdf

Description:: TRANS NPN 30V 0.1A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC184_D27Z from Fairchild Semiconductor is a silicon NPN small-signal transistor in TO-92 package, rated for V_CEO = 30 V (min), h_FE = 130 (min) at V_CE = 5.0 V and I_C = 100 mA, with f_T = 150 MHz and P_D = 350 mW - used in audio preamplifier stages, signal switching, and low-power linear amplification circuits.

For engineers reviewing the BC184_D27Z datasheet, pinout, applications, or equivalent options, key selection considerations include DC current gain linearity at 10–100 mA, saturation voltage under defined base drive, thermal resistance (R_θJA = 357 °C/W), and junction temperature range (−55 to +150 °C).

Technical Context

The BC184_D27Z operates as a general-purpose NPN bipolar junction transistor optimized for linear amplification and low-speed switching. Its h_FE specification is guaranteed ≥130 at I_C = 100 mA and V_CE = 5 V, and its f_T of 150 MHz supports RF amplifier use up to mid-VHF band.

It features V_CBO = 45 V and V_EBO = 5 V, enabling safe operation in bias networks with moderate reverse-base stress. Cob = 5 pF at V_CE = 10 V ensures minimal Miller effect in common-emitter configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	30 V min - defines maximum collector-emitter voltage before breakdown in active mode
h_FE	130 min @ V_CE=5 V, I_C=100 mA - ensures predictable current amplification in bias-stable amplifier designs
f_T	150 MHz - enables use in VHF small-signal amplifiers and oscillator buffer stages
P_D	350 mW @ T_A=25°C - sets continuous power handling on standard FR-4 PCB without heatsink
R_θJA	357 °C/W - indicates thermal performance on 1.6" × 1.6" × 0.06" FR-4 board
C_ob	5 pF @ V_CE=10 V, f=1 MHz - limits high-frequency feedback in common-emitter gain stages

Pinout & Package

BC184_D27Z is housed in a through-hole TO-92 package with 3 leads: Collector (lead 1), Base (lead 2), Emitter (lead 3). The package meets JEDEC TO-92 outline standards and is compatible with standard axial lead insertion and wave soldering processes.

Pin/Terminal	Circuit Role	Design Meaning
1 (Collector)	Main current output terminal	Carries amplified load current; connected to supply rail or pull-up resistor in common-emitter configuration
2 (Base)	Control input terminal	Accepts bias current to regulate collector current; requires current-limiting resistor in series for stable operation
3 (Emitter)	Current return path	Provides reference node for bias network; often tied to ground or emitter degeneration resistor

Key Features

Feature	Design Value
DC current gain stability	h_FE ≥130 at I_C = 100 mA ensures consistent gain across production lots in amplifier bias design
Low saturation voltage	V_CE(sat) ≤ 0.6 V at I_C = 100 mA / I_B = 5 mA enables efficient switching in logic interface and driver applications
High transition frequency	f_T = 150 MHz supports small-signal amplification up to 50 MHz with usable gain margin
Wide operating temperature	Junction range −55 to +150 °C allows deployment in industrial ambient environments without derating

Applications

Audio Preamp Stage	Signal Switching Node
Use Scenario: Low-noise voltage amplification of microphone or line-level analog signals prior to ADC sampling. IC Role / Device Role / Timing Role: NPN small-signal transistor configured in common-emitter topology with emitter degeneration. Use Value: h_FE ≥130 and V_BE(on) = 0.55–0.7 V enable stable DC bias point and low THD in Class-A operation.	Use Scenario: Digital-to-analog level translation between 3.3 V microcontroller outputs and 5 V peripheral enable lines. IC Role / Device Role / Timing Role: Saturated switch controlling current flow to external loads via collector-emitter path. Use Value: V_CE(sat) ≤ 0.6 V at I_C/I_B = 20 ensures <100 mV voltage drop and minimal power loss during ON state.
RF Buffer Amplifier	Temperature-Stable Bias Reference
Use Scenario: Isolation and gain restoration in 30–100 MHz oscillator output paths. IC Role / Device Role / Timing Role: Common-emitter amplifier with resistive collector load and bypassed emitter. Use Value: f_T = 150 MHz and C_ob = 5 pF provide >10 dB gain margin at 50 MHz with predictable phase response.	Use Scenario: Constant-current source in precision op-amp bias networks requiring drift-compensated current mirrors. IC Role / Device Role / Timing Role: Transistor operated in active region with fixed base current to generate stable I_C. Use Value: h_FE tolerance and −55 to +150 °C operating range support ±2% current stability over industrial temperature extremes.

Audio Preamp Stage

Signal Switching Node

Use Scenario: Low-noise voltage amplification of microphone or line-level analog signals prior to ADC sampling.

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

Use Value: h_FE ≥130 and V_BE(on) = 0.55–0.7 V enable stable DC bias point and low THD in Class-A operation.

Use Scenario: Digital-to-analog level translation between 3.3 V microcontroller outputs and 5 V peripheral enable lines.

IC Role / Device Role / Timing Role: Saturated switch controlling current flow to external loads via collector-emitter path.

Use Value: V_CE(sat) ≤ 0.6 V at I_C/I_B = 20 ensures <100 mV voltage drop and minimal power loss during ON state.

RF Buffer Amplifier

Temperature-Stable Bias Reference

Use Scenario: Isolation and gain restoration in 30–100 MHz oscillator output paths.

IC Role / Device Role / Timing Role: Common-emitter amplifier with resistive collector load and bypassed emitter.

Use Value: f_T = 150 MHz and C_ob = 5 pF provide >10 dB gain margin at 50 MHz with predictable phase response.

Use Scenario: Constant-current source in precision op-amp bias networks requiring drift-compensated current mirrors.

IC Role / Device Role / Timing Role: Transistor operated in active region with fixed base current to generate stable I_C.

Use Value: h_FE tolerance and −55 to +150 °C operating range support ±2% current stability over industrial temperature extremes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC547B	Higher h_FE range (200–450), same V_CEO = 45 V, TO-92 package	Better suited for high-gain, low-input-current amplifier stages where BC184_D27Z's 130 min h_FE may limit loop gain	Select BC547B when higher DC gain or lower base drive requirement is critical; verify layout compatibility due to identical TO-92 footprint
2N3904	Lower P_D = 350 mW (same), but tighter h_FE binning (100–300), V_CEO = 40 V, same pinout	Preferred in commercial-grade timing circuits and digital logic interfaces where tighter gain distribution improves consistency	Choose 2N3904 for production designs requiring statistical gain control; BC184_D27Z remains appropriate for cost-sensitive industrial analog stages

Compared with BC547B and 2N3904, BC184_D27Z offers a balanced trade-off of gain, voltage rating, and thermal capability in legacy-compatible TO-92 form factor - ideal for repair, replacement, and designs originally specified with Fairchild BC184-series transistors.

Availability

BC184_D27Z is available at Aetrix Electronics and suitable for audio preamplifier stages, signal switching nodes, and RF buffer amplifier circuits requiring stable component supply and long-term industrial availability.

Supply support for BC184_D27Z 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The BC184_D27Z belongs to Fairchild's legacy silicon NPN small-signal transistor family, designed for general-purpose linear amplification and switching in consumer, industrial, and communications equipment.

FAQ

What is the maximum collector-emitter voltage rating for BC184_D27Z?

The BC184_D27Z has a minimum BV_CEO rating of 30 V, verified per test condition I_C = 2 mA. This defines the absolute upper limit for collector-to-emitter voltage in active or cutoff modes. Exceeding this value risks avalanche breakdown and permanent device damage. Designers should maintain at least 20% margin below 30 V in continuous operation, especially at elevated temperatures where derating applies.

Does BC184_D27Z have a specified transition frequency (f_T)?

Yes, BC184_D27Z has a typical f_T of 150 MHz, measured at V_CE = 5 V, I_C = 10 mA, and f = 100 MHz. This value confirms suitability for small-signal amplification up to ~50 MHz with usable gain. It is not characterized for RF power amplification or broadband matching networks beyond its specified test conditions.

What is the thermal resistance from junction to ambient (R_θJA) for BC184_D27Z?

The BC184_D27Z exhibits R_θJA = 357 °C/W when mounted on a standard 1.6" × 1.6" × 0.06" FR-4 PCB. This value assumes no copper pour or thermal vias. For reliable operation at full 350 mW dissipation, ambient temperature must remain below 55 °C. Derating begins above 25 °C at 2.8 mW/°C as specified in the Absolute Maximum Ratings table.

Is BC184_D27Z pin-compatible with other TO-92 NPN transistors like 2N3904?

Yes, BC184_D27Z uses the standard TO-92 package with pinout: lead 1 = Collector, lead 2 = Base, lead 3 = Emitter - identical to 2N3904, BC547, and PN2222A. Mechanical fit and solder footprint are interchangeable. However, electrical parameters (e.g., h_FE, V_CEO, f_T) differ, so functional substitution requires circuit validation.

What is the base-emitter on voltage (V_BE(on)) for BC184_D27Z under typical operating conditions?

The BC184_D27Z has a V_BE(on) range of 0.55 V to 0.7 V, specified at V_CE = 5 V and I_C = 2 mA. This forward-biased junction voltage determines required base drive headroom in amplifier bias networks. At higher currents (e.g., I_C = 100 mA), V_BE(sat) rises to 1.2 V, which must be accounted for in saturated-switch designs using BC184_D27Z.

BC184_D27Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

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

Voltage - Collector Emitter Breakdown (Max):: 30 V

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 5mA, 100mA

Current - Collector Cutoff (Max):: 15nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 130 @ 100mA, 5V

Power - Max:: 350 mW

Frequency - Transition:: 150MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

BC184_D27Z FAQ

1.How can I place an order for BC184_D27Z through Aetrix?

Please submit a Request for Quotation (RFQ) for BC184_D27Z 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 BC184_D27Z reliable?

The price and inventory of BC184_D27Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC184_D27Z is usually 5 days.

3.What payment methods are accepted for BC184_D27Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC184_D27Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC184_D27Z?

BC184_D27Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC184_D27Z 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 BC184_D27Z?

For technical support, including BC184_D27Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC184_D27Z requirements.

6.How does Aetrix verify that BC184_D27Z is sourced from the original manufacturer or authorized distributors?

All BC184_D27Z 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 BC184_D27Z meets industry standards.

7.What is the process for return or replacement of BC184_D27Z?

All BC184_D27Z units undergo pre-shipment inspection (PSI). If there is an issue with BC184_D27Z, 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 BC184_D27Z part is unused and in its original packaging.

Return procedure for BC184_D27Z:

1.Submit a request within 90 days.

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

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