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

Infineon Technologies BCP49H6419

Name: BCP49H6419
Brand: Infineon Technologies
SKU: BCP49H6419
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCP49H6419

Manufacturer:: Infineon Technologies

Category:: Single Bipolar Transistors

Package:: TO-261-4, TO-261AA

Datasheet:: BCP49H6419.pdf

Description:: TRANS NPN DARL 60V 0.5A SOT223-4

Quantity:: RFQ Add To RFQ list

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Inventory:16,000

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Product details

Overview

BCP49H6419 from Infineon Technologies is an NPN silicon Darlington transistor designed for general-purpose audio-frequency switching and amplification. It delivers 500 mA DC collector current, 60 V V_CEO, minimum h_FE of 2000 at 100 µA I_C, and operates up to 150 °C junction temperature in automotive-grade SOT223 package.

For engineers reviewing the BCP49H6419 datasheet, BCP49H6419 pinout, BCP49H6419 application, or BCP49H6419 equivalent, key selection criteria include Darlington gain linearity across 100 µA–500 mA I_C, V_CE(sat) ≤1 V at 100 mA/0.1 mA drive, thermal resistance R_thJS ≤17 K/W, and AEC-Q101 qualification for under-hood use.

Technical Context

This Darlington pair integrates two NPN transistors in cascade to achieve high DC current gain (h_FE = 10,000 max at 100 mA) while maintaining low base drive requirements. Its structure supports linear amplification and saturated switching with V_BE(sat) ≤1.5 V and f_T = 200 MHz at 50 mA.

The device uses a monolithic die in SOT223 with exposed collector tab for thermal conduction. Electrical characteristics are specified across −65 °C to +150 °C, with ICBO < 10 µA at 150 °C and C_cb = 6.5 pF at 10 V - enabling stable operation in thermally demanding analog and power control circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - maximum safe collector-emitter voltage before breakdown in common-emitter configuration
I_C (DC)	500 mA - continuous collector current rating at T_S = 124 °C, defining steady-state load capability
h_FE min	2000 @ 100 µA - guaranteed minimum DC current gain at low signal level, critical for sensor interface sensitivity
V_CE(sat)	≤1 V @ 100 mA/0.1 mA - low saturation voltage ensures minimal power loss in switching applications
R_thJS	≤17 K/W - thermal resistance from junction to soldering point, enabling direct PCB copper pad heatsinking
f_T	200 MHz @ 50 mA - transition frequency confirming usable bandwidth for AF and low-speed digital switching
AEC-Q101	Qualified - validated for automotive electronics per stress test standard, including HTOL and temperature cycling

Pinout & Package

SOT223 package with exposed collector tab for thermal dissipation; 4-pin configuration with emitter (Pin 1), base (Pin 2), collector (Pin 3), and collector (Pin 4) - dual collector terminals reduce bond wire inductance and improve current sharing.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Emitter	Main current return path; connected internally to first transistor emitter and second transistor emitter
Pin 2	Base	Input control terminal; drives first transistor base, requiring only ~0.1 mA for 100 mA output
Pin 3 & Pin 4	Collector	Dual collector terminals tied to both transistors' collectors; enables parallel routing and lower thermal impedance

Key Features

Feature	Design Value
High h_FE linearity	h_FE ≥4000 @ 10 mA and ≥10,000 @ 100 mA - enables precise current mirroring and low-input-current amplifier stages
Pb-free RoHS compliance	Meets EU Directive 2011/65/EU without exemption - suitable for consumer and industrial end products without lead content restrictions
Thermal robustness	T_j = 150 °C max and R_thJS ≤17 K/W - supports operation on compact PCBs without forced air cooling
Low leakage at high temp	ICBO ≤10 µA @ 150 °C - maintains off-state integrity in engine-control modules exposed to under-hood heat

Applications

Automotive Interior Lighting Control

Industrial Relay Driver Circuit

Use Scenario: Driving 12 V LED strips in vehicle cabin lighting with PWM dimming up to 2 kHz.

IC Role / Device Role / Timing Role: Darlington switch providing 500 mA load current with <1 V saturation drop and <1.5 V base-emitter drive.

Use Value: Eliminates need for external base resistors or driver ICs due to integrated high-gain topology and AEC-Q101 reliability.

Use Scenario: Replacing mechanical relays in PLC output modules controlling solenoids and indicator lamps.

IC Role / Device Role / Timing Role: High-current switching element interfacing microcontroller GPIO to 24 V/300 mA inductive loads.

Use Value: Reduces board space by 60% vs. relay + flyback diode solution while supporting 200 kHz switching for fast response.

Audio Power Amplifier Bias Stage

DC Motor Speed Controller (Small Appliance)

Use Scenario: Setting quiescent current in Class AB audio output stage for portable speaker systems.

IC Role / Device Role / Timing Role: Precision current source delivering stable 1–10 mA bias current over −40 °C to +85 °C ambient.

Use Value: Maintains h_FE stability across temperature, minimizing crossover distortion without thermal compensation circuitry.

Use Scenario: Controlling brushed DC motor in cordless vacuum cleaner with 12 V supply and 400 mA stall current.

IC Role / Device Role / Timing Role: Low-saturation switch in H-bridge half-bridge leg, handling bidirectional PWM at 10 kHz.

Use Value: Achieves <1 W conduction loss at full load, reducing heatsink requirement and enabling sealed enclosure design.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Darlington transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCP52H6419	PNP complement; same SOT223 package, V_CEO = −60 V, h_FE ≥2000 @ 100 µA	Required where complementary push-pull output stage or high-side switching is needed	Select when designing symmetrical amplifier outputs or sourcing current from positive rail
MJD44H11G	TO-220 package; higher P_tot = 1.75 W, V_CEO = 80 V, but no AEC-Q101 qualification	Suitable for non-automotive industrial power supplies needing >500 mA peak current	Choose for higher power dissipation margin where board space allows TO-220 mounting

Compared with BCP52H6419, this part provides NPN polarity essential for low-side switching; versus MJD44H11G, it trades package size and absolute voltage rating for automotive qualification and surface-mount compatibility.

Availability

BCP49H6419 is available at Aetrix Electronics and suitable for automotive interior lighting control, industrial relay driver circuits, audio power amplifier bias stages, and DC motor speed controllers requiring stable component supply across extended temperature ranges.

Supply support for BCP49H6419 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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs and discrete devices.

The BCP49H6419 belongs to Infineon's bipolar transistor portfolio targeting high-reliability, high-gain switching in automotive and industrial environments - engineered specifically for AEC-Q101 compliance and thermal resilience in compact SOT223 form factor.

FAQ

What is the maximum allowable base current for continuous operation?

The absolute maximum DC base current is 100 mA, but for reliable long-term operation, base current should be limited to ≤10 mA. At 100 mA I_C, typical drive is 0.1 mA; exceeding 10 mA risks thermal runaway due to internal power dissipation in the base region, especially above 100 °C ambient.

Can BCP49H6419 be used in linear amplifier configurations?

Yes - its h_FE linearity across 100 µA–100 mA and V_CE(sat) < 1 V support Class A and AB amplifier biasing. However, thermal derating must be applied: at 25 °C ambient, maximum continuous I_C is ~350 mA to maintain T_j < 150 °C with standard 2-layer PCB copper area.

Is the SOT223 package lead-free and RoHS-compliant?

Yes - BCP49H6419 uses a fully Pb-free termination finish compliant with RoHS Directive 2011/65/EU. The package contains no lead in solder plating, mold compound, or die attach; full material declaration is available in Infineon's ELV and RoHS compliance documentation.

How does AEC-Q101 qualification impact design-in for non-automotive applications?

AEC-Q101 qualification ensures robustness against temperature cycling, humidity, and mechanical shock - making BCP49H6419 suitable for harsh industrial environments like factory automation or outdoor equipment. It does not require automotive-specific documentation, and qualification adds no cost or lead time penalty for commercial use.

BCP49H6419 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: TO-261-4, TO-261AA

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN - Darlington

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 100µA, 100mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 10000 @ 100mA, 5V

Power - Max:: 1.5 W

Frequency - Transition:: 200MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT223-4

BCP49H6419 FAQ

1.How can I place an order for BCP49H6419 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCP49H6419 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 BCP49H6419 reliable?

The price and inventory of BCP49H6419 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCP49H6419 is usually 5 days.

3.What payment methods are accepted for BCP49H6419?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCP49H6419 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCP49H6419?

BCP49H6419 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCP49H6419 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 BCP49H6419?

For technical support, including BCP49H6419 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCP49H6419 requirements.

6.How does Aetrix verify that BCP49H6419 is sourced from the original manufacturer or authorized distributors?

All BCP49H6419 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 BCP49H6419 meets industry standards.

7.What is the process for return or replacement of BCP49H6419?

All BCP49H6419 units undergo pre-shipment inspection (PSI). If there is an issue with BCP49H6419, 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 BCP49H6419 part is unused and in its original packaging.

Return procedure for BCP49H6419:

1.Submit a request within 90 days.

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

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