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NXP Semiconductors BC337-40,412
- Part No.:
- BC337-40,412
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
BC337-40,412.pdf
- Description:
- TRANS NPN 45V 0.5A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,667
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Product details
Overview
BC337-40,412 from Nexperia is an NPN general-purpose bipolar junction transistor in TO-92 (SOT54) package, rated for 45 V VCEO, 500 mA IC, and DC current gain (hFE) of 250–600 at IC = 100 mA and VCE = 1 V. It delivers 625 mW power dissipation at Tamb ≤ 25 °C and supports switching and linear amplification in low-voltage control circuits.
For engineers reviewing the BC337-40,412 datasheet, BC337-40,412 pinout, BC337-40,412 application, or BC337-40,412 equivalent, this page provides verified technical context, pin-level design meaning, thermal behavior on FR4 PCBs, and validated alternatives for discrete BJT selection in cost-sensitive industrial and consumer designs.
Technical Context
The BC337-40,412 operates as a silicon NPN BJT with base-controlled current amplification. Its hFE range (250–600) enables stable biasing across temperature (−65 °C to +150 °C), and its VCE(sat) ≤ 700 mV at IC = 500 mA / IB = 50 mA ensures low conduction loss in saturated switching.
Designed for through-hole mounting on standard FR4 PCBs, it exhibits Rth(j-a) = 200 K/W and Ptot = 625 mW at Tamb ≤ 25 °C. Its 3-pin SOT54 (TO-92) footprint supports manual assembly and wave soldering without thermal derating below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum collector-emitter voltage before breakdown under open-base conditions; defines safe operating voltage headroom in 24 V and lower DC systems. |
| IC (DC) | 500 mA - Continuous collector current rating; supports relay drivers, LED arrays, and small-signal power stages without forced cooling. |
| hFE | 250–600 - DC current gain at IC = 100 mA / VCE = 1 V; enables predictable base drive sizing for reliable saturation in switching applications. |
| VCE(sat) | ≤ 700 mV - Collector-emitter saturation voltage at IC = 500 mA / IB = 50 mA; minimizes power loss and self-heating during on-state operation. |
| Ptot | 625 mW - Total power dissipation at Tamb ≤ 25 °C; permits direct mounting on standard single-sided FR4 without heatsinking in low-duty-cycle use. |
| Rth(j-a) | 200 K/W - Junction-to-ambient thermal resistance; confirms effective heat transfer from die to board surface in typical through-hole layout. |
| fT | 100 MHz - Transition frequency at IC = 10 mA / VCE = 5 V; validates usability in audio-frequency amplification and low-speed digital switching (≤10 MHz). |
Pinout & Package
BC337-40,412 uses the plastic single-ended leaded (through-hole) SOT54 (TO-92) package per JEDEC TO-92 and JEITA SC-43A standards. Dimensions include body length 14.5 mm, lead pitch 2.54 mm, and terminal spacing compliant with standard 0.1″ grid PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Reference node for current flow; connects to ground or low-side return path; polarity must match NPN topology to avoid reverse-bias damage. |
| 2 | Base | Control input for current amplification; requires series resistor to limit IB and ensure saturation at target IC. |
| 3 | Collector | High-side output node; carries load current; must be isolated from base/emitter by ≥45 V in off-state to prevent breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| High DC current gain (hFE) | 250–600 range reduces required base drive current, simplifying microcontroller GPIO interfacing and lowering driver-stage component count. |
| Low VCE(sat) | ≤ 700 mV at full 500 mA load ensures <0.35 W conduction loss, enabling compact thermal design in space-constrained enclosures. |
| Robust thermal performance | Rth(j-a) = 200 K/W and 625 mW Ptot allow operation up to +125 °C ambient with no derating on standard FR4, supporting industrial temperature-grade deployment. |
| TO-92 through-hole compatibility | SOT54 package supports manual prototyping, wave soldering, and legacy board rework without requiring SMT infrastructure or reflow profiles. |
Applications
| LED Driver Circuit | Microcontroller I/O Expander |
|---|---|
Use Scenario: Driving 20 mA–350 mA indicator or status LEDs from 3.3 V or 5 V logic outputs. IC Role / Device Role / Timing Role: NPN switch providing current sinking path from LED anode to ground; base driven directly by MCU GPIO. Use Value: hFE ≥ 250 ensures <1.4 mA base current suffices for 350 mA LED load, preserving MCU drive capability and reducing external resistor count. |
Use Scenario: Extending digital output capability of resource-limited MCUs (e.g., 8-bit PIC/AVR) to drive higher-current peripherals like solenoids or fans. IC Role / Device Role / Timing Role: Discrete current amplifier stage translating weak MCU output into robust 500 mA switching capability. Use Value: VCE(sat) ≤ 700 mV limits voltage drop across BC337-40,412, maintaining >4.3 V at load terminals in 5 V systems for reliable actuator activation. |
| Relay Coil Driver | Audio Pre-amplifier Stage |
Use Scenario: Switching 12 V/24 V electromagnetic relays with coil currents up to 400 mA in industrial control panels. IC Role / Device Role / Timing Role: Saturated NPN switch isolating low-voltage logic from inductive relay loads; flyback diode required externally. Use Value: 45 V VCEO rating accommodates relay coil back-EMF spikes up to 40 V, eliminating need for additional clamping components in most cases. |
Use Scenario: Low-noise voltage amplification stage in battery-powered audio signal chains (e.g., microphone preamp, tone control). IC Role / Device Role / Timing Role: Common-emitter amplifier biased in linear region for analog signal gain with fT = 100 MHz ensuring flat response up to 20 kHz. Use Value: hFE consistency across temperature (−65 °C to +150 °C) maintains stable gain calibration without active compensation circuitry. |
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 |
|---|---|---|---|
| BC337-25,412 | Lower hFE range (160–400); identical VCEO, IC, package, and thermal specs. | Less margin in base drive design; suitable where tighter hFE tolerance is acceptable or lower gain avoids overdrive in sensitive analog stages. | Select BC337-25,412 when consistent mid-range gain is preferred over maximum amplification, especially in feedback-stabilized circuits. |
| BC547C | Same SOT54 package but lower IC (100 mA), lower Ptot (500 mW), and hFE 420–800; not drop-in due to current/power mismatch. | Limited to sub-100 mA loads; unsuitable for relay or high-brightness LED driving where BC337-40,412's 500 mA rating is essential. | Choose BC547C only for low-power signal amplification where gain linearity matters more than current delivery. |
Compared with BC337-25,412, BC337-40,412 offers higher minimum hFE for more robust base drive margin; compared with BC547C, it provides 5× higher current handling and 25% greater power dissipation-critical for industrial load switching where reliability under sustained load is non-negotiable.
Availability
BC337-40,412 is available at Aetrix Electronics and suitable for industrial control panels, consumer appliance PCBs, and automotive body electronics requiring stable component supply with long-term manufacturing continuity.
Supply support for BC337-40,412 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
Nexperia is a global leader in discrete semiconductors, formed in 2017 from the former NXP Standard Products division, with focus on automotive, industrial, computing, and consumer markets.
The BC337-40,412 belongs to Nexperia's general-purpose BJT portfolio designed for cost-effective, high-reliability switching and amplification in mass-produced electronic systems where TO-92 form factor and proven ruggedness are key requirements.
FAQ
What is the maximum continuous collector current for BC337-40,412?
The BC337-40,412 supports a maximum continuous collector current (IC) of 500 mA at ambient temperatures ≤25 °C. Derating applies above 25 °C per the thermal resistance curve (Rth(j-a) = 200 K/W), and peak pulsed current reaches 1 A for tp ≤ 300 μs. This rating makes BC337-40,412 suitable for driving medium-power loads such as relays and LED arrays without auxiliary cooling.
Does BC337-40,412 have a specified transition frequency (fT)?
Yes, BC337-40,412 has a transition frequency (fT) of 100 MHz, measured at IC = 10 mA, VCE = 5 V, and f = 100 MHz. This value confirms its suitability for audio-frequency amplification and low-speed digital switching applications up to ~10 MHz, though it is not intended for RF or high-speed data transmission circuits.
What is the pin configuration of BC337-40,412 in the SOT54 package?
BC337-40,412 uses the standard SOT54 (TO-92) pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This configuration is fixed and documented in Nexperia's official datasheet (Rev. 06, 2009). Correct orientation is critical-viewing the flat side with leads downward, pins are numbered left-to-right as 1–2–3.
Can BC337-40,412 replace BC337-16,412 in an existing design?
Yes, BC337-40,412 can directly replace BC337-16,412 because both share identical package (SOT54), voltage/current ratings (45 V VCEO, 500 mA IC), and thermal characteristics. The only difference is hFE: BC337-40,412 guarantees 250–600 vs. BC337-16,412's 100–250. Higher gain improves base drive margin but may require minor bias adjustment in precision linear applications.
What is the storage temperature range for BC337-40,412?
The BC337-40,412 has a specified storage temperature range of −65 °C to +150 °C, matching its operational junction temperature limit. This wide range supports logistics handling in extreme climates and long-term inventory storage without parametric shift, provided humidity and electrostatic precautions per J-STD-033 are observed.
BC337-40,412 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- 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):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 250 @ 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
BC337-40,412 FAQ
1.How can I place an order for BC337-40,412 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC337-40,412 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 BC337-40,412 reliable?
The price and inventory of BC337-40,412 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC337-40,412 is usually 5 days.
3.What payment methods are accepted for BC337-40,412?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC337-40,412 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC337-40,412?
BC337-40,412 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC337-40,412 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 BC337-40,412?
For technical support, including BC337-40,412 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC337-40,412 requirements.
6.How does Aetrix verify that BC337-40,412 is sourced from the original manufacturer or authorized distributors?
All BC337-40,412 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 BC337-40,412 meets industry standards.
7.What is the process for return or replacement of BC337-40,412?
All BC337-40,412 units undergo pre-shipment inspection (PSI). If there is an issue with BC337-40,412, 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 BC337-40,412 part is unused and in its original packaging.
Return procedure for BC337-40,412:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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