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

onsemi BC337ZL1

Name: BC337ZL1
Brand: onsemi
SKU: BC337ZL1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC337ZL1

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body, Formed Leads

Datasheet:: BC337ZL1.pdf

Description:: TRANS NPN 45V 0.8A TO92

Quantity:: RFQ Add To RFQ list

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Inventory:4,902

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Product details

Overview

BC337ZL1 from onsemi is an NPN silicon general-purpose amplifier transistor in TO-92 package, rated for 45 V_CEO, 800 mA continuous collector current, and 625 mW power dissipation at 25°C ambient. It delivers DC current gain (h_FE) of 100–630 depending on bias, with f_T = 210 MHz and V_CE(sat) ≤ 0.7 V at I_C = 500 mA / I_B = 50 mA - used in low-voltage switching and linear amplification stages of consumer power supplies and signal conditioning circuits.

For engineers reviewing the BC337ZL1 datasheet, pinout, applications, or equivalent options, key selection criteria include its V_CEO/I_C rating margin, h_FE binning (standard BC337, not −16/−25/−40 variants), thermal resistance (R_JA = 200°C/W), and TO-92 mechanical compatibility in space-constrained PCB layouts.

Technical Context

The BC337ZL1 operates as a medium-power, low-frequency NPN bipolar junction transistor optimized for linear amplification and saturated switching. Its design supports base-driven operation with V_BE(on) ≈ 1.2 V at I_C = 300 mA and exhibits Cob = 15 pF at V_CB = 10 V, enabling stable performance up to ~200 MHz small-signal bandwidth.

It shares identical maximum ratings and thermal characteristics with the BC337 family but is distinguished by its packaging format: "ZL1" denotes 2000-unit ammo box delivery, not a functional variant. Electrical behavior is fully consistent with the base BC337 grade - not the higher-h_FE −16/−25/−40 subtypes.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe collector-emitter voltage before breakdown; defines upper rail limit in 3.3–24 V supply designs.
I_C (continuous)	800 mA - Sustained collector current capability; supports relay drivers and LED arrays without forced cooling.
P_D @ T_A = 25°C	625 mW - Power handling at room ambient; derates 5 mW/°C above 25°C, limiting usable dissipation in enclosed enclosures.
h_FE	100–630 - DC current gain range at I_C = 100 mA / V_CE = 1 V; enables predictable base resistor sizing across production lots.
f_T	210 MHz - Current-gain bandwidth product; ensures adequate gain margin for audio and low-speed digital signal buffering.
R_JA	200°C/W - Junction-to-ambient thermal resistance; determines temperature rise under load when mounted on bare PCB without heatsink.

Pinout & Package

BC337ZL1 uses the industry-standard TO-92 (Case 29, Style 17) plastic package with 3 leads. Pin 1 is Collector, Pin 2 is Base, Pin 3 is Emitter - confirmed per marking diagram and package outline on page 4 of the BC337/D datasheet.

Pin/Terminal	Circuit Role	Design Meaning
1 (Collector)	Main output current path	Connected to load or next stage; must withstand full V_CEO and I_C stress during saturation/cutoff transitions.
2 (Base)	Control input node	Receives current-limited drive; requires series resistor to limit I_B and ensure h_FE-based saturation (e.g., I_B ≥ I_C/10).
3 (Emitter)	Reference terminal	Typically grounded or tied to emitter resistor; sets bias point and provides return path for I_C + I_B.

Key Features

Feature	Design Value
NPN silicon planar structure	Enables reproducible h_FE distribution and stable β over temperature (−55°C to +150°C junction range).
Low V_CE(sat)	≤0.7 V at I_C = 500 mA / I_B = 50 mA - minimizes conduction loss in switching regulators and logic-level interface circuits.
High f_T	210 MHz - supports clean amplification of audio signals and fast digital edges without phase distortion or gain roll-off.
Pb-free option available	BC337ZL1G variant complies with RoHS; same electrical specs and TO-92 footprint - no redesign needed for compliance migration.

Applications

Audio Pre-amplifier Stage	DC Motor On/Off Control
Use Scenario: Low-noise voltage amplification of microphone or line-level analog signals prior to ADC sampling. IC Role / Device Role / Timing Role: Linear-mode NPN amplifier configured in common-emitter topology with emitter degeneration. Use Value: h_FE ≥ 100 ensures stable gain control; V_CEO = 45 V accommodates ±15 V op-amp rails and transient spikes.	Use Scenario: Driving brushed DC motors (≤12 V, ≤500 mA) in robotics and appliance actuators via microcontroller GPIO. IC Role / Device Role / Timing Role: Saturated switch turning motor power rail on/off with minimal V_CE(sat) loss. Use Value: I_C = 800 mA headroom prevents thermal runaway; TO-92 fits compact motor driver PCBs without heatsinks.
LED Current Driver	Level Translation Interface
Use Scenario: Constant-current driving of high-brightness LEDs in signage and indicator panels. IC Role / Device Role / Timing Role: Emitter-follower or common-emitter current source controlled by PWM or analog voltage. Use Value: 625 mW P_D allows 100–200 mA LED strings at 5–24 V with <1 W total dissipation per device.	Use Scenario: Translating 3.3 V logic outputs to 5 V or 12 V loads in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Inverting level shifter with pull-up resistor on collector, base driven by MCU pin. Use Value: Fast f_T and low C_ob (15 pF) preserve edge integrity up to 10 MHz; V_BE(on) = 1.2 V ensures reliable turn-on from 3.3 V logic.

Audio Pre-amplifier Stage

DC Motor On/Off Control

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

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

Use Value: h_FE ≥ 100 ensures stable gain control; V_CEO = 45 V accommodates ±15 V op-amp rails and transient spikes.

Use Scenario: Driving brushed DC motors (≤12 V, ≤500 mA) in robotics and appliance actuators via microcontroller GPIO.

IC Role / Device Role / Timing Role: Saturated switch turning motor power rail on/off with minimal V_CE(sat) loss.

Use Value: I_C = 800 mA headroom prevents thermal runaway; TO-92 fits compact motor driver PCBs without heatsinks.

LED Current Driver

Level Translation Interface

Use Scenario: Constant-current driving of high-brightness LEDs in signage and indicator panels.

IC Role / Device Role / Timing Role: Emitter-follower or common-emitter current source controlled by PWM or analog voltage.

Use Value: 625 mW P_D allows 100–200 mA LED strings at 5–24 V with <1 W total dissipation per device.

Use Scenario: Translating 3.3 V logic outputs to 5 V or 12 V loads in mixed-voltage embedded systems.

IC Role / Device Role / Timing Role: Inverting level shifter with pull-up resistor on collector, base driven by MCU pin.

Use Value: Fast f_T and low C_ob (15 pF) preserve edge integrity up to 10 MHz; V_BE(on) = 1.2 V ensures reliable turn-on from 3.3 V logic.

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
BC337-25ZL1	Higher h_FE bin (250–400 min/max at I_C = 100 mA); identical V_CEO, I_C, package, and pinout.	Preferred where tighter base drive control or lower I_B is required (e.g., battery-powered sensors).	Select BC337-25ZL1 only if gain consistency >250 is mandatory; BC337ZL1 offers broader h_FE tolerance for cost-sensitive volume production.
PN2222A	Lower V_CEO (40 V vs. 45 V), same I_C (800 mA), slightly higher R_JA (220°C/W), TO-92 compatible pinout.	Suitable for ≤40 V systems; less margin against transients than BC337ZL1.	Choose PN2222A only if legacy design reuse or second-source qualification mandates it; BC337ZL1 provides superior voltage headroom and thermal performance.

Compared with BC337-25ZL1 and PN2222A, the BC337ZL1 balances cost, voltage margin, and thermal efficiency - making it optimal for new designs requiring robust 45 V operation without premium gain binning or legacy compatibility constraints.

Availability

BC337ZL1 is available at Aetrix Electronics and suitable for consumer power supplies, LED lighting controls, audio signal conditioning, and industrial sensor interfaces requiring stable component supply and long-term manufacturability.

Supply support for BC337ZL1 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

onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The BC337ZL1 belongs to onsemi's legacy general-purpose transistor product line, designed for cost-effective, reliable amplification and switching in high-volume consumer and industrial electronics where TO-92 form factor and proven reliability are critical.

FAQ

What is the maximum collector-emitter voltage rating for BC337ZL1?

The BC337ZL1 has a maximum collector-emitter voltage (V_CEO) rating of 45 V DC. This value is verified per the BC337/D datasheet Section "Maximum Ratings" and defines the absolute upper limit before avalanche breakdown occurs with base open. Operating continuously near this limit requires careful thermal management and derating per ambient temperature.

Is BC337ZL1 pin-compatible with other BC337 variants like BC337-25 or BC337-40?

Yes, BC337ZL1 is fully pin-compatible with all BC337 and BC338 variants in TO-92 package - including BC337-25 and BC337-40 - because they share identical Case 29 Style 17 pinout (Collector/Base/Emitter on Pins 1/2/3). However, h_FE bins differ: BC337ZL1 reflects the base-grade gain (100–630), while −25 and −40 denote higher-minimum gain bins.

Does BC337ZL1 have a Pb-free version, and how is it marked?

Yes, the Pb-free version is designated BC337ZL1G and carries the same TO-92 package, electrical specifications, and 2000-unit ammo box packaging as BC337ZL1. Per the ordering table on page 4 of the BC337/D datasheet, both variants use identical marking "7" and differ only in RoHS compliance documentation and lead finish - no layout or schematic changes are needed for substitution.

What is the typical transition frequency (f_T) of BC337ZL1, and under what conditions is it measured?

The typical transition frequency (f_T) of BC337ZL1 is 210 MHz, measured at I_C = 10 mA, V_CE = 5.0 V, and f = 100 MHz per the "Electrical Characteristics" table on page 2 of the BC337/D datasheet. This parameter confirms usable gain beyond audio frequencies and validates suitability for low-speed digital signal buffering and RF pre-driver stages.

Can BC337ZL1 be used in linear regulator pass transistor applications?

BC337ZL1 can serve as a pass transistor in low-dropout linear regulators delivering ≤500 mA, provided V_IN − V_OUT × I_LOAD remains within its 625 mW ambient-rated dissipation limit and thermal design accounts for R_JA = 200°C/W. For sustained >300 mA loads or >10 V dropout, parallel devices or TO-126 packages are recommended to avoid junction overheating.

BC337ZL1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body, Formed Leads

Packaging:: Tape & Box (TB)

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:: 210MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92 (TO-226)

BC337ZL1 FAQ

1.How can I place an order for BC337ZL1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC337ZL1 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 BC337ZL1 reliable?

The price and inventory of BC337ZL1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC337ZL1 is usually 5 days.

3.What payment methods are accepted for BC337ZL1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC337ZL1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC337ZL1?

BC337ZL1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC337ZL1 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 BC337ZL1?

For technical support, including BC337ZL1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC337ZL1 requirements.

6.How does Aetrix verify that BC337ZL1 is sourced from the original manufacturer or authorized distributors?

All BC337ZL1 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 BC337ZL1 meets industry standards.

7.What is the process for return or replacement of BC337ZL1?

All BC337ZL1 units undergo pre-shipment inspection (PSI). If there is an issue with BC337ZL1, 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 BC337ZL1 part is unused and in its original packaging.

Return procedure for BC337ZL1:

1.Submit a request within 90 days.

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

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