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

Infineon Technologies BCX71HE6327HTSA1

Name: BCX71HE6327HTSA1
Brand: Infineon Technologies
SKU: BCX71HE6327HTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCX71HE6327HTSA1

Manufacturer:: Infineon Technologies

Category:: Single Bipolar Transistors

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

Datasheet:: BCX71HE6327HTSA1.pdf

Description:: TRANS PNP 45V 0.1A PG-SOT23

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Product details

Overview

BCX71HE6327HTSA1 from Infineon Technologies is a PNP silicon small-signal transistor designed for audio-frequency input stages and driver circuits. It features V_CEO = 45 V, h_FE = 260–520 (at I_C = 2 mA), V_CE(sat) ≤ 0.25 V (at I_C = 50 mA), and low noise (F = 2 dB at 1 kHz), enabling use in low-distortion preamplifier gain blocks.

For engineers reviewing the BCX71HE6327HTSA1 datasheet, BCX71HE6327HTSA1 pinout, BCX71HE6327HTSA1 application, or BCX71HE6327HTSA1 equivalent, key selection criteria include guaranteed h_FE group H, SOT23 package thermal performance (R_thJS ≤ 240 K/W), low V_CE(sat) at medium current, and AEC-Q101 qualification for automotive signal conditioning.

Technical Context

This transistor operates as a linear amplifying device with fixed-polarity PNP topology, optimized for DC-coupled AF amplification and switching up to 250 MHz (f_T). Its h_FE group H guarantees minimum h_FE = 260 at I_C = 2 mA and V_CE = 5 V, and maximum h_FE = 520 under same conditions - critical for stable biasing in emitter-follower drivers.

Thermal design relies on junction-to-soldering-point resistance (R_thJS ≤ 240 K/W) and rated P_tot = 330 mW at T_S ≤ 71 °C. The device meets AEC-Q101 stress testing for automotive underhood environments, with T_j max = 150 °C and T_stg = –65 to 150 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - supports rail voltages up to ±22.5 V in split-supply audio stages without breakdown
h_FE (I_C = 2 mA)	260–520 - ensures predictable DC bias stability across production lots in gain-setting networks
V_CE(sat)	≤ 0.25 V @ I_C = 50 mA - minimizes power loss and self-heating in active-load driver configurations
f_T	250 MHz - enables stable operation beyond audio band, supporting wideband feedback compensation
Noise figure	2 dB @ 1 kHz - meets low-noise requirements for microphone preamp first-stage amplification
R_thJS	≤ 240 K/W - defines thermal path from die to PCB solder joint, essential for reliability in sealed enclosures

Pinout & Package

BCX71HE6327HTSA1 is housed in a RoHS-compliant SOT23 plastic surface-mount package (JEDEC TO-236AB), with standard pin assignment: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Current-controlled input node	Accepts base drive current to modulate collector-emitter conduction; requires series resistor for stable biasing
2 (Emitter)	Common reference terminal	Typically tied to supply rail in common-base config or ground in common-collector; sets output voltage reference
3 (Collector)	Output current sink	Delivers amplified current to load; polarity inversion relative to base signal confirms PNP operation

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive electronics per stress test requirements (HTOL, TC, AC/DC life tests)
Low V_CE(sat)	0.25 V max at I_C = 50 mA - reduces dropout and improves efficiency in active-load switch applications
Group H h_FE	260–520 range - enables tighter gain binning for matched-pair differential inputs or push-pull drivers
Low noise	2 dB NF @ 1 kHz - preserves SNR in analog front-end signal chains where source impedance is ~2 kΩ

Applications

Audio Preamp Stage

Automotive Sensor Interface

Use Scenario: First amplification stage for electret microphone signals in infotainment head units.

IC Role / Device Role / Timing Role: PNP common-emitter amplifier providing 20–30 dB voltage gain with minimal added noise.

Use Value: 2 dB noise figure and high h_FE ensure >65 dB SNR at 10 mV_pp input, meeting OEM acoustic fidelity specs.

Use Scenario: Level-shifting and buffering of resistive temperature sensor (NTC) outputs in engine control modules.

IC Role / Device Role / Timing Role: Emitter-follower buffer isolating sensor from ADC input while maintaining DC accuracy.

Use Value: Low V_CE(sat) (<0.25 V) prevents offset error in 5 V ratiometric measurement paths.

LED Driver Switch

Complementary Pair Amplifier

Use Scenario: Low-side current sink for status LEDs in dashboard clusters requiring <100 mA drive.

IC Role / Device Role / Timing Role: Saturated PNP switch controlling LED anode connection to regulated 5 V rail.

Use Value: Guaranteed V_CE(sat) ≤ 0.25 V ensures <25 mW dissipation at 100 mA, eliminating need for heatsinking.

Use Scenario: Complementary Class-A output stage in portable audio DAC output filters.

IC Role / Device Role / Timing Role: PNP half of matched BCX71H/BCX70H pair delivering symmetrical positive/negative swing.

Use Value: h_FE group matching (H/H) minimizes crossover distortion below 100 Hz in 2 V_PP line-level output.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCX71J E6327HTSA1	h_FE = 300–630 (group J), V_CE(sat) ≤ 0.55 V @ I_C = 50 mA	Higher gain spread and higher saturation voltage reduce bias stability in precision gain stages	Select only when wider h_FE tolerance is acceptable and V_CE(sat) margin > 0.3 V is available
MMBT4403LT1G	h_FE = 100–300 (min/max), V_CE(sat) ≤ 0.4 V @ I_C = 50 mA, f_T = 200 MHz	Lower f_T and unqualified for AEC-Q101 limit use in automotive or wideband designs	Prefer for cost-sensitive consumer-grade non-automotive applications where AEC-Q101 is not required

Compared with BCX71JE6327HTSA1 and MMBT4403LT1G, BCX71HE6327HTSA1 offers the optimal balance of tight h_FE grouping (260–520), lowest V_CE(sat), and AEC-Q101 compliance - making it the preferred choice for automotive audio front-ends and precision sensor interfaces.

Availability

BCX71HE6327HTSA1 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor signal conditioning, and portable audio equipment requiring stable component supply and long-term lifecycle support.

Supply support for BCX71HE6327HTSA1 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 devices, with global manufacturing and quality certification to ISO/TS 16949.

This part belongs to Infineon's BCX71 family of AEC-Q101-qualified PNP transistors, engineered specifically for high-reliability analog signal conditioning in automotive and industrial control environments.

FAQ

Is BCX71HE6327HTSA1 pin-compatible with BCW61H?

No. BCX71HE6327HTSA1 uses SOT23 (Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector), while BCW61H is in SOT323 with reversed pinout (Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector). Physical substitution will cause circuit failure due to polarity and terminal misalignment.

What is the maximum continuous collector current at 100°C ambient?

At T_A = 100°C, derating applies: P_tot drops to ~180 mW (per thermal curve Fig. 7), limiting I_C to approximately 60 mA for V_CE = 3 V to stay within safe operating area - confirmed by R_thJA ≈ 350 K/W and junction temperature limit of 150°C.

Does BCX71HE6327HTSA1 support pulsed operation above 200 mA?

Yes. Peak collector current I_CM = 200 mA is rated for pulse width ≤ 10 ms (duty cycle ≤ 2%). Figure 8 confirms P_tot(max)/P_tot(DC) = 5 at t_p = 100 µs, enabling short-duration surge handling in LED strobe or sensor excitation circuits.

Can this transistor replace BCX71K in a high-gain amplifier?

No. BCX71K has h_FE = 460–630 (group K), significantly higher than BCX71H's 260–520. Substitution may cause over-biasing, thermal runaway, or gain compression in fixed-resistor bias networks calibrated for higher h_FE.

BCX71HE6327HTSA1 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:: PNP

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 45 V

Vce Saturation (Max) @ Ib, Ic:: 550mV @ 1.25mA, 50mA

Current - Collector Cutoff (Max):: 20nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 180 @ 2mA, 5V

Power - Max:: 330 mW

Frequency - Transition:: 250MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT23

BCX71HE6327HTSA1 FAQ

1.How can I place an order for BCX71HE6327HTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCX71HE6327HTSA1 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 BCX71HE6327HTSA1 reliable?

The price and inventory of BCX71HE6327HTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX71HE6327HTSA1 is usually 5 days.

3.What payment methods are accepted for BCX71HE6327HTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX71HE6327HTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCX71HE6327HTSA1?

BCX71HE6327HTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCX71HE6327HTSA1 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 BCX71HE6327HTSA1?

For technical support, including BCX71HE6327HTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX71HE6327HTSA1 requirements.

6.How does Aetrix verify that BCX71HE6327HTSA1 is sourced from the original manufacturer or authorized distributors?

All BCX71HE6327HTSA1 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 BCX71HE6327HTSA1 meets industry standards.

7.What is the process for return or replacement of BCX71HE6327HTSA1?

All BCX71HE6327HTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BCX71HE6327HTSA1, 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 BCX71HE6327HTSA1 part is unused and in its original packaging.

Return procedure for BCX71HE6327HTSA1:

1.Submit a request within 90 days.

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

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