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

onsemi BC546_J35Z

Name: BC546_J35Z
Brand: onsemi
SKU: BC546_J35Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC546_J35Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BC546_J35Z.pdf

Description:: TRANS NPN 65V 0.1A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC546_J35Z from ON Semiconductor is an NPN epitaxial silicon transistor designed for general-purpose switching and low-noise amplification, with V_CEO = 65 V, h_FE = 110–220 (Class A), and f_T = 300 MHz. It operates in TO-92 package and is commonly used in audio preamplifiers, signal conditioning circuits, and discrete logic-level translators.

For engineers reviewing the BC546_J35Z datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain classification, collector-emitter saturation voltage at 10 mA/0.5 mA drive, noise figure below 10 dB at 1 kHz, and TO-92 mechanical compatibility in space-constrained analog designs.

Technical Context

This device implements a planar epitaxial base structure optimized for stable h_FE across temperature and bias, with specified V_CE(sat) ≤ 250 mV at I_C = 10 mA / I_B = 0.5 mA and V_BE(on) = 580–700 mV at I_C = 2 mA. Its Cob = 3.5–6.0 pF and Cib = 9 pF support RF-coupled amplifier stages up to ~100 MHz.

The BC546_J35Z belongs to the BC546–BC550 family where BC546 variants are distinguished by highest V_CEO (65 V) and V_CBO (80 V), enabling use in higher-voltage linear regulators and relay drivers compared to BC547/BC548 siblings.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	65 V - Supports operation in 48 V supply rails and flyback snubber circuits without breakdown.
h_FE (Class A)	110–220 - Enables predictable DC biasing in Class-A amplifiers with minimal gain variation across production lots.
f_T	300 MHz - Allows stable small-signal amplification up to VHF band (e.g., FM IF stages, oscillator buffers).
V_CE(sat)	90–250 mV @ I_C=10 mA/I_B=0.5 mA - Ensures low conduction loss in saturated-switch applications like LED drivers.
NF	2.0–10.0 dB @ 1 kHz - Meets low-noise requirements for microphone preamps and sensor front-ends.
P_C	500 mW - Permits continuous operation at 100 mA collector current with adequate heatsinking on PCB copper pour.

Pinout & Package

BC546_J35Z is housed in a JEDEC TO-92 3-lead molded plastic package with straight leads (bulk packing). Pin 1 is Collector, Pin 2 is Base, Pin 3 is Emitter - verified per Fairchild BC546 datasheet Rev. 1.1.1 Figure 7 and ON Semiconductor pinout documentation.

Pin/Terminal	Circuit Role	Design Meaning
1 (Collector)	Current sink node	Connected to load or supply rail; must withstand 65 V reverse bias and dissipate heat during saturation.
2 (Base)	Control input	Receives current-limited drive (typically 0.1–5 mA); requires series resistor to prevent overdrive and thermal runaway.
3 (Emitter)	Reference terminal	Common return path for collector and base currents; often tied to ground or emitter degeneration resistor.

Key Features

Feature	Design Value
High-voltage capability	V_CEO = 65 V enables use in 48 V telecom line interfaces and industrial control I/O modules.
Low-noise amplification	NF = 2.0–10.0 dB at 1 kHz supports high-fidelity audio preamp stages without added op-amp complexity.
Stable h_FE range	110–220 (Class A) allows consistent bias point design across manufacturing batches and temperature extremes.
TO-92 mechanical standardization	JEDEC-compliant footprint ensures drop-in replacement in legacy through-hole PCBs and hand-soldered prototyping.

Applications

Audio Preamp Stage	Relay Driver Circuit
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors before ADC sampling. IC Role / Device Role / Timing Role: Discrete NPN transistor configured in common-emitter topology with emitter degeneration for linearity. Use Value: Low 2.0–10.0 dB noise figure preserves SNR; h_FE stability minimizes gain drift across temperature in battery-powered recorders.	Use Scenario: Switching 12–24 V DC relays in PLC I/O modules and HVAC controllers. IC Role / Device Role / Timing Role: Saturated switch controlling relay coil current with flyback diode protection. Use Value: V_CEO = 65 V safely clamps inductive kickback; V_CE(sat) ≤ 250 mV limits power dissipation to <10 mW at 10 mA drive.
Linear Voltage Regulator Pass Element	Discrete Logic Level Translator
Use Scenario: Acting as series pass transistor in adjustable 3–12 V linear regulators for analog subsystems. IC Role / Device Role / Timing Role: Current-controlled variable resistor between input and output, biased via Zener reference. Use Value: 500 mW power rating supports ≥100 mA load current with minimal heatsink; low V_BE(on) improves dropout voltage margin.	Use Scenario: Converting 3.3 V logic outputs to 5 V TTL-compatible inputs in mixed-voltage microcontroller systems. IC Role / Device Role / Timing Role: Common-emitter inverter with pull-up resistor on collector for level shifting. Use Value: f_T = 300 MHz ensures sub-100 ns propagation delay; TO-92 footprint simplifies manual rework on prototype boards.

Audio Preamp Stage

Relay Driver Circuit

Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors before ADC sampling.

IC Role / Device Role / Timing Role: Discrete NPN transistor configured in common-emitter topology with emitter degeneration for linearity.

Use Value: Low 2.0–10.0 dB noise figure preserves SNR; h_FE stability minimizes gain drift across temperature in battery-powered recorders.

Use Scenario: Switching 12–24 V DC relays in PLC I/O modules and HVAC controllers.

IC Role / Device Role / Timing Role: Saturated switch controlling relay coil current with flyback diode protection.

Use Value: V_CEO = 65 V safely clamps inductive kickback; V_CE(sat) ≤ 250 mV limits power dissipation to <10 mW at 10 mA drive.

Linear Voltage Regulator Pass Element

Discrete Logic Level Translator

Use Scenario: Acting as series pass transistor in adjustable 3–12 V linear regulators for analog subsystems.

IC Role / Device Role / Timing Role: Current-controlled variable resistor between input and output, biased via Zener reference.

Use Value: 500 mW power rating supports ≥100 mA load current with minimal heatsink; low V_BE(on) improves dropout voltage margin.

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

IC Role / Device Role / Timing Role: Common-emitter inverter with pull-up resistor on collector for level shifting.

Use Value: f_T = 300 MHz ensures sub-100 ns propagation delay; TO-92 footprint simplifies manual rework on prototype boards.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC547BTA	V_CEO = 45 V (vs. 65 V); h_FE = 200–450 (Class B); same TO-92 package.	Lower voltage rating restricts use in >40 V supply rails; higher h_FE reduces required base drive current.	Select BC547BTA only when operating voltage ≤40 V and tighter h_FE tolerance is needed.
PN2222A	V_CEO = 40 V; P_C = 625 mW; h_FE = 100–300; TO-92 but different pinout (E-B-C vs. C-B-E).	Not pin-compatible - requires PCB layout change; higher power rating suits higher-current switching.	Choose PN2222A only if board redesign is acceptable and 625 mW dissipation is required.

Compared with BC547BTA and PN2222A, BC546_J35Z offers the highest V_CEO in its family for 48 V system compatibility, while maintaining TO-92 fit-and-function in legacy designs where pinout and gain class are fixed constraints.

Availability

BC546_J35Z is available at Aetrix Electronics and suitable for audio preamplifiers, relay driver circuits, and linear voltage regulator pass elements requiring stable component supply across industrial and consumer electronics programs.

Supply support for BC546_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

ON Semiconductor (formerly Fairchild Semiconductor) is a global supplier of energy-efficient semiconductor components, specializing in power management, analog, and discrete devices for automotive, industrial, and consumer markets.

The BC546_J35Z belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, engineered for reliability in cost-sensitive, high-volume analog signal conditioning and switching applications.

FAQ

What is the maximum collector-emitter voltage rating for BC546_J35Z?

The BC546_J35Z has a maximum collector-emitter voltage (V_CEO) rating of 65 V, verified per Fairchild BC546 datasheet Rev. 1.1.1 Absolute Maximum Ratings table. This rating applies at T_A = 25°C and defines the upper limit for safe DC or peak repetitive operation without avalanche breakdown. Exceeding this voltage risks permanent device failure, especially under inductive load conditions without proper clamping.

Is BC546_J35Z pin-compatible with BC547 or BC548 transistors?

Yes, BC546_J35Z shares identical TO-92 pinout (Collector-Base-Emitter, Pin 1–2–3) and mechanical footprint with BC547 and BC548, as confirmed in the Fairchild BC546/BC547/BC548 datasheet Figure 7. However, BC546_J35Z differs electrically: it has higher V_CEO (65 V vs. 45 V/30 V) and lower h_FE range (110–220 vs. 200–450/420–800), so direct substitution requires verification of voltage and gain requirements in the target circuit.

What is the typical noise figure of BC546_J35Z and under what conditions is it measured?

The BC546_J35Z exhibits a noise figure (NF) of 2.0–10.0 dB, measured at V_CE = 5 V, I_C = 200 μA, f = 1 kHz, and R_G = 2 kΩ, per the Electrical Characteristics table in the BC546 datasheet. This makes BC546_J35Z suitable for low-noise preamplifier stages where signal integrity is critical, though actual NF varies with bias point and source impedance in final designs.

Does BC546_J35Z have a specified current gain bandwidth product (f_T)?

Yes, BC546_J35Z has a specified f_T of 300 MHz, measured at V_CE = 5 V, I_C = 10 mA, and f = 100 MHz, as documented in the Electrical Characteristics section. This parameter confirms suitability for RF amplifier stages, oscillator buffers, and fast-switching applications up to VHF frequencies, provided layout parasitics are minimized.

What packaging options are available for BC546_J35Z?

BC546_J35Z is supplied in TO-92 3L package with bulk packing, consistent with the BC546ABU and BC546ATA ordering variants described in the Fairchild datasheet. The device uses straight-lead configuration per JEDEC TO-92 standard, and no tape-and-reel or ammo-packaged variant is designated for the J35Z suffix in official documentation.

BC546_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):: 65 V

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

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 110 @ 2mA, 5V

Power - Max:: 500 mW

Frequency - Transition:: 300MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

BC546_J35Z FAQ

1.How can I place an order for BC546_J35Z through Aetrix?

Please submit a Request for Quotation (RFQ) for BC546_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 BC546_J35Z reliable?

The price and inventory of BC546_J35Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC546_J35Z is usually 5 days.

3.What payment methods are accepted for BC546_J35Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC546_J35Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC546_J35Z?

BC546_J35Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC546_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 BC546_J35Z?

For technical support, including BC546_J35Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC546_J35Z requirements.

6.How does Aetrix verify that BC546_J35Z is sourced from the original manufacturer or authorized distributors?

All BC546_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 BC546_J35Z meets industry standards.

7.What is the process for return or replacement of BC546_J35Z?

All BC546_J35Z units undergo pre-shipment inspection (PSI). If there is an issue with BC546_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 BC546_J35Z part is unused and in its original packaging.

Return procedure for BC546_J35Z:

1.Submit a request within 90 days.

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

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