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 BC337A_J35Z

Name: BC337A_J35Z
Brand: onsemi
SKU: BC337A_J35Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BC337A_J35Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BC337A_J35Z.pdf

Description:: TRANS NPN 45V 0.8A TO-92-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,036

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

Product details

Overview

BC337A_J35Z from ON Semiconductor is an NPN epitaxial silicon transistor in TO-92 package, rated for 45 V V_CEO, 800 mA I_C, and 625 mW P_D, with h_FE of 100–250 at I_C = 100 mA. It serves as a general-purpose switching and amplification device in low-power analog and digital signal paths, including AF driver stages and low-power output stages.

For engineers reviewing the BC337A_J35Z datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, TO-92 terminal mapping, real-world use cases, and two validated alternative transistors for design flexibility and supply continuity.

Technical Context

This discrete NPN bipolar junction transistor operates in linear or saturated mode depending on base drive, with guaranteed DC current gain (h_FE) across 100–250 at V_CE = 1 V and I_C = 100 mA. Its 50 V V_CES rating supports margin above 45 V V_CEO, and 12 pF C_ob enables stable operation up to 100 MHz f_T.

Thermal performance is defined by R_θJA = 200 °C/W on standard FR-4 PCB, with derating starting at 25 °C ambient. The device is not qualified for automotive or safety-critical applications and is intended for commercial-grade consumer and industrial electronics.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum collector-emitter voltage before breakdown under open-base condition; sets safe operating voltage ceiling for switching circuits.
I_C (DC)	800 mA - Continuous collector current limit; defines maximum load-handling capability in amplifier or switch configurations.
P_D	625 mW - Total power dissipation at 25 °C ambient; determines thermal headroom before derating begins.
h_FE	100–250 - DC current gain range at V_CE = 1 V, I_C = 100 mA; directly impacts required base drive current for saturation.
f_T	100 MHz - Current gain bandwidth product; indicates usable frequency limit for small-signal amplification.
V_CE(sat)	0.7 V @ I_C = 500 mA, I_B = 50 mA - Saturation voltage drop; determines conduction loss and heat generation in switching mode.
C_ob	12 pF @ V_CB = 10 V - Output capacitance; affects high-frequency response and switching speed in tuned or fast-switching circuits.

Pinout & Package

BC337A_J35Z is housed in a JEDEC TO-92 3-lead plastic package with straight leads. Pin 1 is Collector, Pin 2 is Base, Pin 3 is Emitter - confirmed per Fairchild/ON Semiconductor mechanical drawings and ordering information tables.

Pin/Terminal	Circuit Role	Design Meaning
1	Collector	Main current sink terminal; connects to load or supply rail in common-emitter configuration.
2	Base	Control input; requires ~50 mA drive for full saturation at 500 mA collector current.
3	Emitter	Current source terminal; typically grounded or tied to reference node in most amplifier/switch topologies.

Key Features

Feature	Design Value
Switching & Amplifier Use	Validated for both linear amplification (AF drivers) and digital switching (low-power logic interface), reducing BOM count in mixed-signal designs.
Complementary Pairing	Designed as NPN counterpart to BC327 PNP transistor, enabling matched push-pull or differential pair implementations.
TO-92 Standardization	JEDEC-compliant TO-92 footprint ensures compatibility with legacy through-hole assembly lines and hand-soldering workflows.
h_FE Classification	"A" suffix denotes h_FE = 100–250 group, enabling predictable base resistor selection without binning during production.

Applications

Audio Pre-Amplifier Stage	LED Driver Switch
Use Scenario: Low-noise voltage amplification of microphone or line-level signals prior to ADC sampling. IC Role / Device Role / Timing Role: NPN small-signal amplifier configured in common-emitter topology with emitter degeneration. Use Value: 100–250 h_FE and 100 MHz f_T support stable gain up to 20 kHz audio band with minimal distortion.	Use Scenario: Driving single or parallel LEDs from microcontroller GPIO pins with current limiting. IC Role / Device Role / Timing Role: Low-side switch controlling LED cathode connection to ground. Use Value: 0.7 V V_CE(sat) minimizes power loss, while 800 mA I_C rating accommodates multi-LED strings.
Relay Driver Interface	Logic-Level Translator
Use Scenario: Interfacing 3.3 V or 5 V MCU outputs to 12 V relay coils requiring ~20–50 mA drive. IC Role / Device Role / Timing Role: Saturated NPN switch providing galvanic isolation between control and load side. Use Value: Guaranteed saturation at I_B/I_C = 1/10 enables robust turn-on with minimal base resistor calculation overhead.	Use Scenario: Level-shifting between 3.3 V logic and 5 V peripherals where open-drain buffers are unavailable. IC Role / Device Role / Timing Role: Active pull-up transistor in emitter-follower or common-collector configuration. Use Value: V_BE(on) = 1.2 V at I_C = 300 mA ensures reliable turn-on from 3.3 V sources with margin.

Audio Pre-Amplifier Stage

LED Driver Switch

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

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

Use Value: 100–250 h_FE and 100 MHz f_T support stable gain up to 20 kHz audio band with minimal distortion.

Use Scenario: Driving single or parallel LEDs from microcontroller GPIO pins with current limiting.

IC Role / Device Role / Timing Role: Low-side switch controlling LED cathode connection to ground.

Use Value: 0.7 V V_CE(sat) minimizes power loss, while 800 mA I_C rating accommodates multi-LED strings.

Relay Driver Interface

Logic-Level Translator

Use Scenario: Interfacing 3.3 V or 5 V MCU outputs to 12 V relay coils requiring ~20–50 mA drive.

IC Role / Device Role / Timing Role: Saturated NPN switch providing galvanic isolation between control and load side.

Use Value: Guaranteed saturation at I_B/I_C = 1/10 enables robust turn-on with minimal base resistor calculation overhead.

Use Scenario: Level-shifting between 3.3 V logic and 5 V peripherals where open-drain buffers are unavailable.

IC Role / Device Role / Timing Role: Active pull-up transistor in emitter-follower or common-collector configuration.

Use Value: V_BE(on) = 1.2 V at I_C = 300 mA ensures reliable turn-on from 3.3 V sources with margin.

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
BC337-25	Same TO-92 package, identical pinout, h_FE = 160–400 at I_C = 100 mA - higher gain bin.	Higher h_FE reduces required base drive but increases sensitivity to temperature drift in linear operation.	Select when lower base current or tighter gain consistency is needed; verify stability in feedback loops.
MMBT337	SOT-23 surface-mount package, same electrical specs (V_CEO = 45 V, I_C = 800 mA), h_FE = 100–250.	Enables miniaturized PCB layouts but requires rework of footprint and assembly process for SMT.	Choose for space-constrained designs where TO-92 is impractical; confirm thermal relief on SOT-23 pad.

Compared with BC337-25 and MMBT337, BC337A_J35Z offers standardized TO-92 through-hole compatibility and mid-range h_FE for predictable biasing in cost-sensitive, medium-volume consumer electronics.

Availability

BC337A_J35Z is available at Aetrix Electronics and suitable for audio pre-amplifier stages, LED driver switches, relay driver interfaces, and logic-level translators requiring stable component supply and long-term manufacturing continuity.

Supply support for BC337A_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 is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

BC337A_J35Z belongs to ON Semiconductor's general-purpose bipolar transistor product line, designed for cost-effective, reliable signal amplification and switching in commercial-grade electronic systems.

FAQ

What is the maximum collector-emitter voltage rating for BC337A_J35Z?

The BC337A_J35Z has a maximum collector-emitter voltage (V_CEO) rating of 45 V under open-base conditions. This value is specified at T_A = 25 °C and defines the upper voltage limit before avalanche breakdown occurs. Exceeding this rating risks permanent device failure, and designers must ensure sufficient margin in circuit operation - especially during transient events - to maintain reliability over temperature and lifetime.

Does BC337A_J35Z have a documented h_FE range, and how is it binned?

Yes, BC337A_J35Z is binned to the "A" classification, specifying a DC current gain (h_FE) range of 100–250 measured at V_CE = 1 V and I_C = 100 mA. This binning allows consistent base resistor selection across production lots and eliminates need for post-manufacturing gain sorting in most applications. The h_FE remains within this range across its full operating temperature range, though actual values vary with bias point and junction temperature.

What package type and pin configuration does BC337A_J35Z use?

BC337A_J35Z uses the JEDEC-standard TO-92 3-lead plastic package with straight leads. Pin 1 is Collector, Pin 2 is Base, and Pin 3 is Emitter - matching the mechanical drawing in the official ON Semiconductor datasheet. This configuration is identical across all BC337 variants and ensures compatibility with existing TO-92 footprints, test fixtures, and manual or automated assembly processes.

Can BC337A_J35Z be used in automotive applications?

No, BC337A_J35Z is not qualified for automotive applications. Per ON Semiconductor's authorized use policy, this device is designated for commercial-grade use only and is explicitly excluded from automotive, aerospace, medical life-support, or other safety-critical systems unless separately approved in writing. Its qualification level lacks AEC-Q101 stress testing, and no automotive-specific reliability data is published for BC337A_J35Z.

What is the thermal resistance and power derating behavior of BC337A_J35Z?

BC337A_J35Z has a junction-to-ambient thermal resistance (R_θJA) of 200 °C/W on a standard FR-4 PCB (76 mm × 114 mm, 1.57 mm thick). Its maximum power dissipation is 625 mW at 25 °C ambient, derating linearly at 5.0 mW/°C above that temperature. At 75 °C ambient, usable power drops to 375 mW - a critical constraint for enclosed or high-temperature environments where heatsinking is impractical.

BC337A_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):: 800 mA

Voltage - Collector Emitter Breakdown (Max):: 45 V

Vce Saturation (Max) @ Ib, Ic:: 700mV @ 50mA, 500mA

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 100mA, 1V

Power - Max:: 625 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

BC337A_J35Z FAQ

1.How can I place an order for BC337A_J35Z through Aetrix?

Please submit a Request for Quotation (RFQ) for BC337A_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 BC337A_J35Z reliable?

The price and inventory of BC337A_J35Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC337A_J35Z is usually 5 days.

3.What payment methods are accepted for BC337A_J35Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC337A_J35Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC337A_J35Z?

BC337A_J35Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC337A_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 BC337A_J35Z?

For technical support, including BC337A_J35Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC337A_J35Z requirements.

6.How does Aetrix verify that BC337A_J35Z is sourced from the original manufacturer or authorized distributors?

All BC337A_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 BC337A_J35Z meets industry standards.

7.What is the process for return or replacement of BC337A_J35Z?

All BC337A_J35Z units undergo pre-shipment inspection (PSI). If there is an issue with BC337A_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 BC337A_J35Z part is unused and in its original packaging.

Return procedure for BC337A_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…