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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single, Pre-Biased Bipolar Transistors

Infineon Technologies BCR 149T E6327

Name: BCR 149T E6327
Brand: Infineon Technologies
SKU: BCR 149T E6327
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCR 149T E6327

Manufacturer:: Infineon Technologies

Category:: Single, Pre-Biased Bipolar Transistors

Package:: SC-75, SOT-416

Datasheet:: BCR 149T E6327.pdf

Description:: TRANS PREBIAS NPN 50V 0.07A SC75

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Product details

Overview

BCR 149T E6327 from Infineon Technologies is an NPN silicon digital transistor with integrated bias resistor (R1 = 47 kΩ), designed for switching, inverting, interface, and driver circuits. It features V_CEO = 50 V, I_C = 70 mA, V_CE(sat) ≤ 0.3 V at I_C = 10 mA/I_B = 0.5 mA, h_FE = 120–630, and SC75 package for space-constrained PCB layouts in portable electronics.

For engineers reviewing the BCR 149T E6327 datasheet, BCR 149T E6327 pinout, BCR 149T E6327 application, or BCR 149T E6327 equivalent, key selection criteria include built-in R1 tolerance (32–62 kΩ), thermal resistance R_thJS = 165 K/W, input on/off voltage thresholds, and SC75 footprint compatibility with high-density SMT assembly.

Technical Context

This digital transistor integrates a single 47 kΩ base bias resistor (R1) between base and supply rail, eliminating external components in simple low-side switch configurations. Its common-emitter DC gain (h_FE) spans 120–630 at I_C = 5 mA/V_CE = 5 V, supporting reliable saturation across process variation.

The device operates with V_CE(sat) ≤ 0.3 V under pulsed conditions (t < 300 µs, D < 2%), enabling efficient low-voltage logic-level switching. Junction temperature is rated to 150 °C, with derated power dissipation down to 250 mW at T_S ≤ 109 °C for the SC75 variant.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - maximum collector-emitter voltage before breakdown in open-base configuration
I_C	70 mA - continuous collector current rating for steady-state switching operation
V_CE(sat)	≤ 0.3 V at I_C = 10 mA/I_B = 0.5 mA - ensures low conduction loss and minimal self-heating
h_FE	120–630 at I_C = 5 mA/V_CE = 5 V - wide DC gain range supports robust drive margin in digital on/off use
R1	47 kΩ (32–62 kΩ min–max) - integrated base pull-up resistor enables single-resistor control interface
f_T	150 MHz - usable for signal switching up to ~10–20 MHz with adequate gain margin
C_cb	3 pF at V_CB = 10 V - low capacitance minimizes high-frequency coupling and propagation delay

Pinout & Package

BCR 149T E6327 is housed in the SC75 (SOT-416) surface-mount plastic package: 1.6 mm × 0.8 mm × 0.5 mm body, 3-terminal, gull-wing leads, tape-and-reel packaging (3,000 pcs/reel, ø180 mm).

Pin/Terminal	Circuit Role	Design Meaning
1 (B)	Base	Internal connection to R1; accepts logic-level input to enable transistor switching
2 (E)	Emiter	Common emitter node; tied to ground or low-side return path in typical switch topology
3 (C)	Collector	Switched output node; drives load between V_CC and collector in low-side configuration

Key Features

Feature	Design Value
Integrated bias resistor R1	47 kΩ ±22% - eliminates external base resistor, reducing BOM count and layout area
Low V_CE(sat)	≤ 0.3 V - minimizes power loss and heat generation in battery-powered or thermally constrained designs
SC75 package	1.6 × 0.8 × 0.5 mm - enables high-density placement in wearables, IoT sensors, and compact consumer PCBs
Wide h_FE range	120–630 - accommodates process variation without requiring gain binning or feedback compensation
High f_T	150 MHz - supports fast edge rates and reliable operation in 1–10 MHz digital switching applications

Applications

LED Driver Circuit

Microcontroller Interface

Use Scenario: Driving discrete indicator LEDs from 3.3 V or 5 V GPIO pins in handheld devices.

IC Role / Device Role / Timing Role: Low-side switch controlled directly by MCU output, using internal R1 for logic-compatible turn-on.

Use Value: Eliminates need for external base resistor; V_CE(sat) ≤ 0.3 V ensures >90% LED forward voltage utilization at 10–20 mA.

Use Scenario: Level-shifting and isolation between 1.8 V/3.3 V logic domains in sensor nodes.

IC Role / Device Role / Timing Role: Digital buffer/inverter with defined Vi(on)/Vi(off) thresholds (0.5–1.5 V / 0.4–0.8 V) for clean logic transition.

Use Value: Input hysteresis and guaranteed switching margins prevent metastability in noisy embedded environments.

Power Supply Enable Switch

Relay/Small Solenoid Driver

Use Scenario: Enabling/disabling auxiliary 5 V or 12 V rails via microcontroller command in industrial controllers.

IC Role / Device Role / Timing Role: High-gain NPN switch controlling PMOS gate or low-current enable line with minimal GPIO loading.

Use Value: h_FE ≥ 120 ensures full saturation with <100 µA base drive, reducing MCU port current burden.

Use Scenario: Driving 5–24 V, <50 mA coils in compact automation modules or smart home actuators.

IC Role / Device Role / Timing Role: Low-side driver with flyback diode integration support and fast turn-off (C_cb = 3 pF).

Use Value: Low C_cb and 150 MHz f_T limit switching time to <100 ns, minimizing coil dwell delay and EMI.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCR148T E6327	V_CEO = 50 V, but R1 = 100 kΩ (min–max 68–132 kΩ); h_FE = 100–400	Higher input impedance; lower base drive sensitivity; reduced gain margin	Select when higher Vi(off) threshold or lower base current consumption is required
NSVD120DP03MX	Same SC75 package; R1 = 47 kΩ; but V_CEO = 30 V and I_C = 100 mA	Lower voltage rating; higher current capability; optimized for 3.3 V systems	Prefer for 3.3 V logic-driven loads where 50 V margin is unnecessary and higher I_C headroom is beneficial

Compared with BCR 149T E6327, BCR148T offers higher input resistance but narrower gain range, while NSVD120DP03MX trades voltage headroom for increased current drive-both require revalidation of V_CE(sat) and thermal performance in the target layout.

Availability

BCR 149T E6327 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface logic, and power supply enable switches requiring stable component supply, consistent parametric performance, and SC75 footprint compatibility.

Supply support for BCR 149T E6327 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 is a German semiconductor manufacturer specializing in power management, automotive ICs, and discrete power devices, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

The BCR series belongs to Infineon's digital transistor product line, engineered for cost-sensitive, high-volume digital switching applications where integration of bias resistors reduces design complexity and improves board-level reliability.

FAQ

Is BCR 149T E6327 RoHS-compliant and halogen-free?

Yes, BCR 149T E6327 conforms to RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The SC75 package uses lead-free matte tin plating, and material declarations are available in Infineon's Eco Reports (document number 2019-00124).

What is the maximum allowable PCB temperature during reflow soldering?

The SC75 package supports standard lead-free reflow profiles with peak temperature ≤ 260 °C for ≤ 30 seconds. Recommended profile follows IPC/JEDEC J-STD-020D: preheat 150–200 °C, soak 150–200 °C for 60–120 s, ramp-up ≤ 3 °C/s, peak 235–260 °C.

Can BCR 149T E6327 be used in linear amplifier mode?

No-it is characterized and qualified only for digital switching operation. The wide h_FE spread (120–630), unspecified linearity parameters, and lack of small-signal AC models make it unsuitable for analog amplification; use dedicated general-purpose transistors like BC847 instead.

Does the built-in R1 resistor tolerate reverse voltage on the base terminal?

The R1 resistor is connected between base and emitter internally; applying reverse voltage (e.g., negative base-emitter bias) exceeds the specified V_EB(rev) = 5 V and may cause irreversible degradation. Always ensure base voltage remains within –5 V to +1.5 V relative to emitter in normal operation.

BCR 149T E6327 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: SC-75, SOT-416

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Transistor Type:: NPN - Pre-Biased

Current - Collector (Ic) (Max):: 70 mA

Voltage - Collector Emitter Breakdown (Max):: 50 V

Resistor - Base (R1):: 47 kOhms

Resistor - Emitter Base (R2):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 120 @ 5mA, 5V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 500µA, 10mA

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

Frequency - Transition:: 150 MHz

Power - Max:: 250 mW

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SC75-3D

BCR 149T E6327 FAQ

1.How can I place an order for BCR 149T E6327 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCR 149T E6327 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 BCR 149T E6327 reliable?

The price and inventory of BCR 149T E6327 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCR 149T E6327 is usually 5 days.

3.What payment methods are accepted for BCR 149T E6327?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCR 149T E6327 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCR 149T E6327?

BCR 149T E6327 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCR 149T E6327 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 BCR 149T E6327?

For technical support, including BCR 149T E6327 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCR 149T E6327 requirements.

6.How does Aetrix verify that BCR 149T E6327 is sourced from the original manufacturer or authorized distributors?

All BCR 149T E6327 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 BCR 149T E6327 meets industry standards.

7.What is the process for return or replacement of BCR 149T E6327?

All BCR 149T E6327 units undergo pre-shipment inspection (PSI). If there is an issue with BCR 149T E6327, 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 BCR 149T E6327 part is unused and in its original packaging.

Return procedure for BCR 149T E6327:

1.Submit a request within 90 days.

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

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