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

onsemi BC182_J35Z

Name: BC182_J35Z
Brand: onsemi
SKU: BC182_J35Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC182_J35Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BC182_J35Z.pdf

Description:: TRANS NPN 50V 0.1A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC182_J35Z from Fairchild Semiconductor is an NPN general-purpose bipolar junction transistor (BJT) designed for low-power amplification and switching at collector currents up to 100 mA. It features V_CEO = 50 V, V_CBO = 60 V, h_FE = 40–500 (depending on I_C), f_T = 150 MHz, and TO-92 package. It is commonly used in audio preamplifier stages, signal buffering, and discrete logic interface circuits.

For engineers reviewing the BC182_J35Z datasheet, pinout, applications, or equivalent options, key selection considerations include its DC current gain range across operating currents, saturation voltage at 100 mA, thermal dissipation limit of 350 mW at 25°C, and suitability for general-purpose analog and low-speed digital switching where cost and simplicity are prioritized.

Technical Context

The BC182_J35Z operates as a silicon NPN BJT with a planar epitaxial structure (Fairchild Process 10). Its h_FE varies significantly with collector current - 40 min at I_C = 10 µA, 120 min at 2 mA, and 80 min at 100 mA - indicating optimized gain behavior across bias points. It exhibits low noise figure (10 dB at 1 kHz, R_S = 2 kΩ) and moderate output capacitance (C_ob = 5 pF at V_CE = 10 V).

Thermal performance is defined by R_θJA = 357°C/W and derating of 2.8 mW/°C above 25°C ambient. The device is not rated for life support applications and has no integrated protection features - external base resistors and clamping are required for robust switching operation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum safe collector-emitter voltage before breakdown under open-base condition; sets upper rail limit in amplifier or switch designs.
I_C (continuous)	100 mA - Absolute max DC collector current; usable up to this level with appropriate heatsinking and derating.
h_FE	40–500 - Wide DC current gain range; requires bias design verification per operating point (e.g., 120 min at 2 mA, 80 min at 100 mA).
f_T	150 MHz - Unity-gain bandwidth; supports small-signal amplification up to ~10–20 MHz with usable gain margin.
P_D @ T_A=25°C	350 mW - Total power dissipation limit at room ambient; drops linearly above 25°C (2.8 mW/°C derating).
V_CE(sat)	0.25 V (I_C=10 mA, I_B=0.5 mA) - Low saturation voltage enables efficient low-side switching with minimal conduction loss.
C_ob	5 pF - Output junction capacitance at 10 V; impacts high-frequency response and Miller effect in amplifier configurations.

Pinout & Package

BC182_J35Z is housed in a through-hole TO-92 package (3-lead, epoxy molded, standard lead frame). Dimensions conform to JEDEC TO-92 outline: body height ≤3.86 mm, lead spacing 1.27 mm, overall length 4.58 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or low-impedance return path; base-emitter forward bias initiates conduction.
2 (Base)	Control input	Receives current-limited drive (typically via series resistor); controls collector current proportionally to h_FE.
3 (Collector)	Current source terminal	Supplies load current when saturated or active; requires proper voltage headroom and heat management at >50 mA.

Key Features

Feature	Design Value
NPN general-purpose BJT	Enables simple, low-cost amplification and switching without integrated biasing or protection circuitry.
150 MHz f_T	Supports RF front-end stages up to VHF band in low-noise receiver applications when properly biased.
10 dB noise figure	Validates suitability for low-level signal amplification (e.g., microphone preamps) where SNR preservation matters.
TO-92 package	Facilitates manual prototyping, through-hole PCB assembly, and replacement in legacy consumer electronics service.
JEDEC-compliant pinout	Ensures mechanical and electrical compatibility with BC107, BC108, BC109, and other TO-92 NPN transistors in same footprint.

Applications

Audio Preamp Stage	Discrete Logic Level Shifter
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors in portable audio devices. IC Role / Device Role / Timing Role: Small-signal NPN amplifier operating in common-emitter configuration with emitter degeneration. Use Value: Delivers stable 20–40 dB voltage gain with low distortion and 10 dB noise figure, preserving signal integrity at sub-mV input levels.	Use Scenario: Translating 3.3 V logic outputs to 5 V TTL-compatible inputs in mixed-voltage microcontroller systems. IC Role / Device Role / Timing Role: Saturated switch providing clean low-impedance pull-down to ground for open-collector bus interfacing. Use Value: Achieves <0.25 V V_CE(sat) at 10 mA drive, ensuring reliable logic '0' assertion while minimizing power loss and heat rise.
Low-Power Relay Driver	Simple Oscillator Core
Use Scenario: Driving 5–12 V coil relays in industrial control panels where microcontroller GPIO cannot source sufficient current. IC Role / Device Role / Timing Role: Medium-current switch with base resistor network limiting I_B to ensure full saturation at I_C ≤ 100 mA. Use Value: Handles relay coil inrush and steady-state current within 350 mW thermal limit, eliminating need for MOSFET-level complexity.	Use Scenario: Building RC-based astable multivibrators or Hartley oscillators in educational kits and timing reference circuits. IC Role / Device Role / Timing Role: Active gain element sustaining oscillation via positive feedback and frequency-selective tank network. Use Value: 150 MHz f_T and predictable h_FE enable stable oscillation up to ~5 MHz with minimal component count and tuning effort.

Audio Preamp Stage

Discrete Logic Level Shifter

Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors in portable audio devices.

IC Role / Device Role / Timing Role: Small-signal NPN amplifier operating in common-emitter configuration with emitter degeneration.

Use Value: Delivers stable 20–40 dB voltage gain with low distortion and 10 dB noise figure, preserving signal integrity at sub-mV input levels.

Use Scenario: Translating 3.3 V logic outputs to 5 V TTL-compatible inputs in mixed-voltage microcontroller systems.

IC Role / Device Role / Timing Role: Saturated switch providing clean low-impedance pull-down to ground for open-collector bus interfacing.

Use Value: Achieves <0.25 V V_CE(sat) at 10 mA drive, ensuring reliable logic '0' assertion while minimizing power loss and heat rise.

Low-Power Relay Driver

Simple Oscillator Core

Use Scenario: Driving 5–12 V coil relays in industrial control panels where microcontroller GPIO cannot source sufficient current.

IC Role / Device Role / Timing Role: Medium-current switch with base resistor network limiting I_B to ensure full saturation at I_C ≤ 100 mA.

Use Value: Handles relay coil inrush and steady-state current within 350 mW thermal limit, eliminating need for MOSFET-level complexity.

Use Scenario: Building RC-based astable multivibrators or Hartley oscillators in educational kits and timing reference circuits.

IC Role / Device Role / Timing Role: Active gain element sustaining oscillation via positive feedback and frequency-selective tank network.

Use Value: 150 MHz f_T and predictable h_FE enable stable oscillation up to ~5 MHz with minimal component count and tuning effort.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC547B	Higher h_FE bin (200–450), same TO-92, V_CEO = 45 V, P_D = 500 mW	Better suited for higher-gain linear amplification; lower V_CEO limits high-voltage use cases	Select BC547B when gain consistency at 2–10 mA is critical and supply rails stay ≤45 V.
2N3904	V_CEO = 40 V, f_T = 300 MHz, P_D = 625 mW, tighter h_FE spread (100–300)	Superior high-frequency response and thermal margin; widely available and standardized	Choose 2N3904 for new designs requiring broader availability, higher speed, or improved manufacturability over legacy BC182 variants.

Compared with BC182_J35Z, BC547B offers higher guaranteed gain at mid-currents but reduced voltage tolerance, while 2N3904 provides superior speed, power handling, and industry-wide sourcing - making it the preferred choice for new designs unless BC182_J35Z is mandated for legacy repair or form-fit replacement.

Availability

BC182_J35Z is available at Aetrix Electronics and suitable for audio preamplification, discrete logic interfacing, and low-power relay driving requiring stable component supply and long-term obsolescence management.

Supply support for BC182_J35Z 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 BC182_J35Z belongs to Fairchild's legacy general-purpose BJT family, engineered for cost-sensitive, low-to-medium frequency analog and switching applications in consumer, industrial, and educational electronics.

FAQ

What is the maximum collector current rating for BC182_J35Z?

The BC182_J35Z has a continuous collector current rating of 100 mA at T_A = 25°C. Operation at this current requires adherence to thermal derating (2.8 mW/°C above 25°C) and verification of V_CE(sat) ≤ 0.6 V under actual circuit conditions. Exceeding 100 mA risks permanent degradation even with short-duration pulses unless transient thermal limits are explicitly validated.

Is BC182_J35Z pin-compatible with BC547 or 2N3904?

Yes, BC182_J35Z uses the standard TO-92 package with E-B-C pinout (1=Emitter, 2=Base, 3=Collector), matching BC547 and 2N3904. However, direct substitution requires validation of V_CEO, h_FE, and f_T requirements - BC182_J35Z offers 50 V V_CEO versus 45 V (BC547) and 40 V (2N3904), but lower f_T than 2N3904's 300 MHz.

What is the typical noise figure of BC182_J35Z and at what conditions?

The BC182_J35Z has a noise figure of 10 dB measured at V_CE = 5 V, I_C = 0.2 mA, R_S = 2 kΩ, and f = 1 kHz. This value reflects its suitability for low-noise preamplification; noise performance degrades at higher currents or frequencies, and external layout (grounding, shielding) significantly affects real-world SNR.

Can BC182_J35Z be used in switching applications?

Yes, BC182_J35Z is routinely used in low-speed switching applications such as LED drivers and relay control. Its V_CE(sat) = 0.25 V at I_C = 10 mA / I_B = 0.5 mA ensures low conduction loss. For reliable switching, base drive must be sized to achieve full saturation, and turn-off speed is limited by minority-carrier storage time - not recommended for >100 kHz PWM.

What is the junction-to-ambient thermal resistance (R_θJA) of BC182_J35Z?

The BC182_J35Z has an R_θJA of 357°C/W under standard JEDEC test conditions (single-layer PCB, no copper pour). In practice, adding thermal copper pads or using double-sided board layout reduces effective R_θJA substantially. Derating must begin immediately above 25°C ambient: power dissipation must decrease by 2.8 mW per °C rise to avoid exceeding T_J = 150°C.

BC182_J35Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

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

Voltage - Collector Emitter Breakdown (Max):: 50 V

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

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

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

BC182_J35Z FAQ

1.How can I place an order for BC182_J35Z through Aetrix?

Please submit a Request for Quotation (RFQ) for BC182_J35Z 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 BC182_J35Z reliable?

The price and inventory of BC182_J35Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC182_J35Z is usually 5 days.

3.What payment methods are accepted for BC182_J35Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC182_J35Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC182_J35Z?

BC182_J35Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC182_J35Z 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 BC182_J35Z?

For technical support, including BC182_J35Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC182_J35Z requirements.

6.How does Aetrix verify that BC182_J35Z is sourced from the original manufacturer or authorized distributors?

All BC182_J35Z 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 BC182_J35Z meets industry standards.

7.What is the process for return or replacement of BC182_J35Z?

All BC182_J35Z units undergo pre-shipment inspection (PSI). If there is an issue with BC182_J35Z, 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 BC182_J35Z part is unused and in its original packaging.

Return procedure for BC182_J35Z:

1.Submit a request within 90 days.

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

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