Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi BC547_J35Z

Name: BC547_J35Z
Brand: onsemi
SKU: BC547_J35Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BC547_J35Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BC547_J35Z.pdf

Description:: TRANS NPN 45V 0.1A TO-92-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,282

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BC547_J35Z from ON Semiconductor is a general-purpose NPN epitaxial silicon transistor in TO-92 package, rated for V_CEO = 45 V, I_C = 100 mA, and P_C = 500 mW, with h_FE range of 200–450 (Class B), widely used in low-power switching and small-signal amplification circuits.

For engineers reviewing the BC547_J35Z datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, TO-92 terminal mapping, noise performance (NF = 2.0–10.0 dB), f_T = 300 MHz, and real-world substitution guidance for legacy BC547-family designs.

Technical Context

The BC547_J35Z operates as a discrete bipolar junction transistor with fixed NPN polarity, optimized for linear amplification and saturated switching at DC to ~300 MHz. Its h_FE classification (B) ensures predictable current gain between 200 and 450 at V_CE = 5 V and I_C = 2 mA, while V_BE(on) = 580–700 mV enables reliable turn-on with modest base drive.

It features low output capacitance (C_ob = 3.5–6.0 pF at V_CB = 10 V) and low saturation voltages (V_CE(sat) = 90–250 mV at I_C = 10 mA/I_B = 0.5 mA), supporting fast switching in relay drivers and signal conditioning stages without requiring external compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum collector-emitter voltage before breakdown; supports rail-to-rail operation in 36 V logic and sensor interface circuits.
I_C (DC)	100 mA - Continuous collector current limit; suitable for driving LEDs, small relays, and logic-level buffers.
h_FE (Class B)	200–450 - Confirmed DC current gain range at V_CE = 5 V, I_C = 2 mA; enables stable biasing in amplifier stages without excessive base current sensitivity.
f_T	300 MHz - Current gain-bandwidth product at V_CE = 5 V, I_C = 10 mA; supports RF preamplifier and high-speed pulse shaping up to ~100 MHz.
NF	2.0–10.0 dB - Noise figure at V_CE = 5 V, I_C = 200 μA, f = 1 kHz, R_G = 2 kΩ; appropriate for audio preamps and low-noise sensor front-ends.
V_CE(sat)	90–250 mV - Collector-emitter saturation voltage at I_C = 10 mA/I_B = 0.5 mA; minimizes power loss in switching applications like level translation and load control.

Pinout & Package

BC547_J35Z is housed in a JEDEC-standard TO-92 plastic package with straight leads (bulk or ammo packing), measuring 4.6 mm × 3.3 mm × 4.0 mm, rated for T_J = 150°C maximum junction temperature and T_STG = –65 to +150°C storage range.

Pin/Terminal	Circuit Role	Design Meaning
1 (Collector)	Main current sink node	Connected to load or supply rail; carries full collector current; requires thermal consideration under sustained 100 mA operation.
2 (Base)	Control input terminal	Receives forward-biased current to enable conduction; typical V_BE(on) = 580–700 mV allows direct microcontroller GPIO drive with series resistor.
3 (Emitter)	Current return path	Common reference point for bias network; grounded in common-emitter configuration; defines emitter-follower output impedance.

Key Features

Feature	Design Value
Switching & amplification dual use	Validated by V_CE(sat) ≤ 250 mV and h_FE ≥ 200 - enables single-part reuse across digital logic interfaces and analog gain stages.
Low-noise performance	NF = 2.0–10.0 dB at 1 kHz - meets requirements for microphone preamps and precision instrumentation front-ends where SNR > 60 dB is critical.
High f_T bandwidth	300 MHz - supports stable small-signal gain up to VHF band, enabling RF detector and oscillator buffer roles in low-cost transceivers.
TO-92 mechanical compatibility	JEDEC-compliant 3-lead outline - ensures drop-in replacement in legacy PCBs designed for BC546/BC547/BC548 family parts without footprint change.

Applications

Audio Preamp Stage	Microcontroller GPIO Driver
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors in portable voice recorders. IC Role / Device Role / Timing Role: Small-signal NPN amplifier in common-emitter configuration with emitter degeneration for linearity. Use Value: NF = 2.0–10.0 dB and h_FE = 200–450 ensure >65 dB SNR and stable 20–20 kHz gain without oscillation or distortion.	Use Scenario: Driving LED indicators, buzzer elements, or optocoupler inputs from 3.3 V or 5 V MCU outputs. IC Role / Device Role / Timing Role: Saturated switch with base current limiting resistor, operating in cutoff/saturation regions only. Use Value: V_CE(sat) ≤ 250 mV and I_C = 100 mA allow efficient on-state power dissipation < 25 mW per switch, minimizing heat rise.
Relay Control Interface	Signal Level Translation
Use Scenario: Isolating and amplifying logic-level signals to energize 5–24 V DC coil relays in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Medium-current switch with flyback diode protection, handling inductive kickback during turn-off. Use Value: V_CEO = 45 V withstands transient spikes up to 40 V, while P_C = 500 mW accommodates brief 100 mA surges during relay pull-in.	Use Scenario: Converting 1.8 V or 3.3 V logic outputs to 5 V TTL-compatible levels for interfacing with legacy peripherals. IC Role / Device Role / Timing Role: Common-emitter level shifter with collector pull-up to 5 V rail and base driven by low-voltage source. Use Value: h_FE ≥ 200 ensures full saturation with < 500 μA base current, enabling clean edge transitions and < 10 ns propagation delay.

Audio Preamp Stage

Microcontroller GPIO Driver

Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors in portable voice recorders.

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

Use Value: NF = 2.0–10.0 dB and h_FE = 200–450 ensure >65 dB SNR and stable 20–20 kHz gain without oscillation or distortion.

Use Scenario: Driving LED indicators, buzzer elements, or optocoupler inputs from 3.3 V or 5 V MCU outputs.

IC Role / Device Role / Timing Role: Saturated switch with base current limiting resistor, operating in cutoff/saturation regions only.

Use Value: V_CE(sat) ≤ 250 mV and I_C = 100 mA allow efficient on-state power dissipation < 25 mW per switch, minimizing heat rise.

Relay Control Interface

Signal Level Translation

Use Scenario: Isolating and amplifying logic-level signals to energize 5–24 V DC coil relays in industrial PLC I/O modules.

IC Role / Device Role / Timing Role: Medium-current switch with flyback diode protection, handling inductive kickback during turn-off.

Use Value: V_CEO = 45 V withstands transient spikes up to 40 V, while P_C = 500 mW accommodates brief 100 mA surges during relay pull-in.

Use Scenario: Converting 1.8 V or 3.3 V logic outputs to 5 V TTL-compatible levels for interfacing with legacy peripherals.

IC Role / Device Role / Timing Role: Common-emitter level shifter with collector pull-up to 5 V rail and base driven by low-voltage source.

Use Value: h_FE ≥ 200 ensures full saturation with < 500 μA base current, enabling clean edge transitions and < 10 ns propagation delay.

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
BC547B (ON Semiconductor)	Same h_FE Class B (200–450), identical TO-92 package and pinout; J35Z is a marking variant with same electrical specs.	No functional difference; J35Z reflects Fairchild-era marking convention retained post-ON acquisition.	Select BC547B for new designs requiring standardized ON part numbering; J35Z remains valid for legacy BOM continuity.
PN2222A (ON Semiconductor)	Higher V_CEO = 40 V (vs. 45 V), higher I_C = 800 mA, but wider h_FE spread (100–300); larger V_CE(sat) = 1.6 V at I_C = 500 mA.	Better suited for higher-current loads (>100 mA); less optimal for low-noise audio due to higher NF (~10 dB).	Choose PN2222A only when >100 mA drive capability is required; BC547_J35Z remains preferred for <100 mA, low-noise, or space-constrained TO-92 layouts.

Compared with BC547B and PN2222A, BC547_J35Z offers the tightest h_FE tolerance (200–450) and lowest noise in its class, making it optimal for precision analog and compact digital interface roles where consistency and signal integrity outweigh raw current capacity.

Availability

BC547_J35Z is available at Aetrix Electronics and suitable for audio preamplifiers, microcontroller GPIO expansion, relay control interfaces, and signal level translation requiring stable component supply across prototyping, pilot production, and long-lifecycle embedded programs.

Supply support for BC547_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 BC547_J35Z belongs to the legacy BC5xx family of general-purpose NPN transistors, originally designed for cost-sensitive, high-reliability linear and switching applications in consumer electronics and industrial controls.

FAQ

What is the exact h_FE range specified for BC547_J35Z?

The BC547_J35Z is classified as a Class B device with a confirmed DC current gain (h_FE) range of 200 to 450 at V_CE = 5 V and I_C = 2 mA. This specification is consistent across all BC547B-marked variants including BC547_J35Z, and is validated in the official ON Semiconductor datasheet Rev. 1.1.1.

Does BC547_J35Z have the same pinout as standard TO-92 NPN transistors?

Yes, BC547_J35Z uses the standard TO-92 pinout: Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter (viewed with flat side facing outward and leads pointing down). This matches BC546/BC547/BC548 family parts and is mechanically and electrically compatible with industry-standard TO-92 footprints.

Can BC547_J35Z replace BC547C in a low-noise amplifier design?

No - BC547_J35Z is a Class B device (h_FE = 200–450), whereas BC547C has h_FE = 420–800. Substituting BC547_J35Z for BC547C may reduce gain margin and increase base current sensitivity. For low-noise designs relying on high h_FE, BC547C or BC549B (NF = 1.4–4.0 dB) are more appropriate than BC547_J35Z.

What is the maximum operating temperature for BC547_J35Z?

The BC547_J35Z has a maximum junction temperature (T_J) of 150°C and a storage temperature range (T_STG) of –65°C to +150°C. Derating is required above 25°C ambient; at 100 mA continuous collector current, thermal design must ensure junction temperature stays within this limit using PCB copper area or minimal heatsinking.

Is BC547_J35Z suitable for RF applications up to 100 MHz?

Yes - BC547_J35Z has a current gain-bandwidth product (f_T) of 300 MHz at V_CE = 5 V and I_C = 10 mA, and low output capacitance (C_ob = 3.5–6.0 pF). These characteristics support stable small-signal amplification and buffering in VHF-band circuits up to 100 MHz, provided proper biasing and layout practices are followed.

BC547_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):: 45 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

BC547_J35Z FAQ

1.How can I place an order for BC547_J35Z through Aetrix?

Please submit a Request for Quotation (RFQ) for BC547_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 BC547_J35Z reliable?

The price and inventory of BC547_J35Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC547_J35Z is usually 5 days.

3.What payment methods are accepted for BC547_J35Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC547_J35Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC547_J35Z?

BC547_J35Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC547_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 BC547_J35Z?

For technical support, including BC547_J35Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC547_J35Z requirements.

6.How does Aetrix verify that BC547_J35Z is sourced from the original manufacturer or authorized distributors?

All BC547_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 BC547_J35Z meets industry standards.

7.What is the process for return or replacement of BC547_J35Z?

All BC547_J35Z units undergo pre-shipment inspection (PSI). If there is an issue with BC547_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 BC547_J35Z part is unused and in its original packaging.

Return procedure for BC547_J35Z:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…