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

Infineon Technologies BCR521E6327HTSA1

Name: BCR521E6327HTSA1
Brand: Infineon Technologies
SKU: BCR521E6327HTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCR521E6327HTSA1

Manufacturer:: Infineon Technologies

Category:: Single, Pre-Biased Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BCR521E6327HTSA1.pdf

Description:: TRANS PREBIAS NPN 50V SOT23

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Product details

Overview

BCR521E6327HTSA1 from Infineon Technologies is an NPN silicon digital transistor with integrated bias resistors (R1 = R2 = 1 kΩ), rated for 50 V V_CEO, 500 mA I_C, and 330 mW P_tot at T_S ≤ 79 °C, commonly used in automotive LED driver and logic-level interface circuits per AEC-Q101 qualification.

For engineers reviewing the BCR521E6327HTSA1 datasheet, BCR521E6327HTSA1 pinout, BCR521E6327HTSA1 application, or BCR521E6327HTSA1 equivalent, key selection criteria include built-in resistor ratio (R1/R2 = 0.9–1.1), V_CE(sat) ≤ 0.3 V at I_C = 50 mA/I_B = 2.5 mA, and guaranteed operation from –65 °C to +150 °C junction temperature.

Technical Context

This device integrates two precision 1 kΩ bias resistors (R1 from base to V_IN, R2 from base to emitter) to enable single-resistor drive from microcontroller GPIOs, eliminating external components in low-side switching applications. Its common-emitter configuration supports DC current gain (h_FE) ≥ 20 at I_C = 50 mA/V_CE = 5 V.

Thermal design is constrained by R_thJS ≤ 215 K/W and derated power dissipation above 79 °C case temperature, with pulse operation supported up to 300 µs duty cycle <2%. Transition frequency f_T = 100 MHz enables stable operation in moderate-speed digital switching.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum collector-emitter voltage before breakdown; defines safe operating range in 24 V automotive loads.
I_C	500 mA - Continuous collector current rating; supports driving medium-power LEDs or relays directly.
P_tot	330 mW at T_S ≤ 79 °C - Total power dissipation limit; requires thermal derating above 79 °C case temperature.
V_CE(sat)	≤ 0.3 V at I_C = 50 mA/I_B = 2.5 mA - Low saturation voltage reduces conduction loss and self-heating in switching mode.
R1 / R2	0.7–1.3 kΩ / ratio 0.9–1.1 - Tight tolerance on internal bias resistors ensures consistent turn-on/off thresholds across production lots.
f_T	100 MHz - Transition frequency confirms suitability for digital signal switching up to ~10–20 MHz edge rates.
h_FE	≥ 20 at I_C = 50 mA/V_CE = 5 V - Minimum DC current gain guarantees reliable saturation with standard GPIO drive strength.

Pinout & Package

BCR521E6327HTSA1 is housed in a RoHS-compliant SOT-23 plastic package (JEDEC TO-236AB), with 3-pin surface-mount footprint optimized for automated assembly and thermal performance via exposed pad soldering (not electrically connected).

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Input node connected to internal R1 and R2	Accepts logic-level input; R1 pulls base high, R2 pulls base to emitter for defined off-state leakage control.
2 (Emitter)	Common emitter reference terminal	Connected internally to R2; serves as return path for input current and output load current in low-side switch configuration.
3 (Collector)	Switched output terminal	Carries full load current (up to 500 mA); placed on PCB side with maximum copper area for thermal relief.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive under-hood applications including temperature cycling, humidity, and mechanical shock per stress test requirements.
Integrated R1/R2 bias network	Eliminates two external resistors, reducing BOM count and PCB area while improving layout consistency and ESD robustness.
V_i(off) ≤ 1.5 V	Ensures reliable cutoff when driven by 1.8 V or 3.3 V logic families without additional level-shifting circuitry.
V_i(on) ≥ 1.0 V	Guarantees turn-on with standard CMOS/TTL outputs, supporting direct connection to MCU GPIO pins without pull-up/down ambiguity.
Junction temp. range –65 to +150 °C	Enables deployment in engine control units, body controllers, and lighting modules where ambient temperatures exceed 105 °C.

Applications

Automotive LED Tail Light Driver

Industrial PLC Digital Output Module

Use Scenario: Switching 12 V/24 V LED arrays in rear combination lamps with PWM dimming.

IC Role / Device Role / Timing Role: Low-side constant-current switch controlled by MCU PWM signal; handles repetitive 10 kHz switching with <300 µs pulse width.

Use Value: Built-in R1/R2 ensures fast, predictable turn-off during PWM dead-time, minimizing tail-light ghosting and meeting ECE R7 compliance for response time.

Use Scenario: Driving 24 V solenoid valves and indicator LEDs in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: Discrete output stage translating 3.3 V logic signals into isolated 24 V load switching with galvanic separation via optocoupler input stage.

Use Value: V_CE(sat) ≤ 0.3 V limits power loss to <15 mW at 50 mA, enabling dense channel packing without forced air cooling.

Consumer Appliance Motor Control

Smart Building Occupancy Sensor Interface

Use Scenario: Enabling small DC brush motors in washing machine detergent dispensers and HVAC damper actuators.

IC Role / Device Role / Timing Role: Logic-level controlled H-bridge half-bridge driver (used in complementary pair configuration) with fast turn-on/turn-off for direction reversal.

Use Value: f_T = 100 MHz supports clean 5–10 kHz commutation edges, reducing audible motor whine and EMI emissions in residential environments.

Use Scenario: Interfacing PIR motion sensor outputs to 3.3 V microcontrollers in battery-powered occupancy sensors.

IC Role / Device Role / Timing Role: Level translator and noise-filtering buffer between analog sensor output and digital input pin, rejecting supply ripple and RF coupling.

Use Value: Tight R1/R2 ratio (0.9–1.1) maintains consistent Vi(on)/Vi(off) thresholds across temperature, preventing false triggers in varying ambient conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC847B,315 (Nexperia)	Discrete BJT without bias resistors; requires external R_B and R_E; h_FE = 200–450; V_CEO = 45 V.	Higher gain but no integrated bias network; increases component count and layout sensitivity to noise.	Select when precise h_FE control or higher voltage margin is required, and board space allows external resistors.
NSV5211MT1G (ON Semiconductor)	AEC-Q101 qualified; R1 = R2 = 2.2 kΩ; V_CEO = 50 V; V_CE(sat) = 0.25 V max at same I_C/I_B.	Higher input resistance reduces MCU drive current but raises Vi(on) threshold to 1.3–2.2 V.	Prefer for 5 V logic systems or where lower V_CE(sat) justifies slightly higher input voltage requirement.

Compared with BC847B,315, BCR521E6327HTSA1 reduces bill-of-materials and improves noise immunity via monolithic bias network; versus NSV5211MT1G, it offers tighter R1/R2 matching and lower Vi(on) for 3.3 V MCU compatibility, at marginally higher V_CE(sat).

Availability

BCR521E6327HTSA1 is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC output stages, and smart building sensor interfaces requiring stable component supply and AEC-Q101 reliability assurance.

Supply support for BCR521E6327HTSA1 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, with global manufacturing and quality certification to ISO/TS 16949.

The BCR521 series belongs to Infineon's automotive-qualified digital transistor product line, designed specifically for replacing discrete BJT + resistor combinations in cost-sensitive, space-constrained ECU and body electronics applications.

FAQ

What is the maximum allowable continuous collector current for BCR521E6327HTSA1?

The absolute maximum continuous collector current is 500 mA, specified at case temperature ≤ 79 °C. Above this temperature, power dissipation must be linearly derated per the P_tot vs. T_S curve in the datasheet, reaching zero at 150 °C junction temperature. Operation beyond 500 mA risks thermal runaway and permanent damage.

Can BCR521E6327HTSA1 be used with 1.8 V logic inputs?

Yes - its V_i(off) ≤ 1.5 V and V_i(on) ≥ 1.0 V ensure reliable switching with 1.8 V CMOS outputs. At 1.8 V, the device achieves full saturation with I_B ≈ 0.8 mA, well within typical GPIO sink capability. No level shifter is needed, though layout should minimize trace inductance to preserve edge integrity.

Is the SOT-23 package of BCR521E6327HTSA1 lead-free and RoHS compliant?

Yes - the device uses a fully Pb-free SOT-23 package conforming to RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1). The marking "E6327HTSA1" denotes tape-and-reel packaging with halogen-free molding compound and matte tin lead finish.

How does the built-in resistor ratio affect switching behavior?

The R1/R2 ratio of 0.9–1.1 ensures predictable input hysteresis and stable cutoff under noisy conditions. A mismatch >10% would increase V_i(off) spread and risk incomplete turn-off during supply ripple or ESD transients. This tight ratio directly enables reliable operation in automotive CAN/LIN bus-adjacent modules without added filtering.

BCR521E6327HTSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Last Time Buy

Transistor Type:: NPN - Pre-Biased

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

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

Resistor - Base (R1):: 1 kOhms

Resistor - Emitter Base (R2):: 1 kOhms

DC Current Gain (hFE) (Min) @ Ic, Vce:: 20 @ 50mA, 5V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 2.5mA, 50mA

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

Frequency - Transition:: 100 MHz

Power - Max:: 330 mW

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT23

BCR521E6327HTSA1 FAQ

1.How can I place an order for BCR521E6327HTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCR521E6327HTSA1 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 BCR521E6327HTSA1 reliable?

The price and inventory of BCR521E6327HTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCR521E6327HTSA1 is usually 5 days.

3.What payment methods are accepted for BCR521E6327HTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCR521E6327HTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCR521E6327HTSA1?

BCR521E6327HTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCR521E6327HTSA1 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 BCR521E6327HTSA1?

For technical support, including BCR521E6327HTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCR521E6327HTSA1 requirements.

6.How does Aetrix verify that BCR521E6327HTSA1 is sourced from the original manufacturer or authorized distributors?

All BCR521E6327HTSA1 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 BCR521E6327HTSA1 meets industry standards.

7.What is the process for return or replacement of BCR521E6327HTSA1?

All BCR521E6327HTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BCR521E6327HTSA1, 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 BCR521E6327HTSA1 part is unused and in its original packaging.

Return procedure for BCR521E6327HTSA1:

1.Submit a request within 90 days.

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

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