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

Infineon Technologies BCR129WE6327HTSA1

Name: BCR129WE6327HTSA1
Brand: Infineon Technologies
SKU: BCR129WE6327HTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCR129WE6327HTSA1

Manufacturer:: Infineon Technologies

Category:: Single, Pre-Biased Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: BCR129WE6327HTSA1.pdf

Description:: TRANS PREBIAS NPN 50V SOT323

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Product details

Overview

BCR129WE6327HTSA1 from Infineon Technologies is an NPN silicon digital transistor with integrated bias resistor (R1 = 10 kΩ), designed for switching, inverting, interface, and driver circuits in automotive and industrial control systems. It features V_CEO = 50 V, I_C = 100 mA, V_CE(sat) ≤ 0.3 V at I_C = 10 mA/I_B = 0.5 mA, h_FE = 120–630, and AEC-Q101 qualification.

For engineers reviewing the BCR129WE6327HTSA1 datasheet, BCR129WE6327HTSA1 pinout, BCR129WE6327HTSA1 application, or BCR129WE6327HTSA1 equivalent, key selection criteria include input threshold voltage (V_i(on) = 0.5–1.1 V), thermal resistance (R_thJS ≤ 105 K/W), SOT323 package compatibility, and guaranteed DC current gain across temperature.

Technical Context

This device integrates a single NPN transistor with monolithically embedded base bias resistors (R1 only), eliminating external pull-up components in low-side switch configurations. Its common-emitter switching behavior is defined by V_i(on)/V_i(off) thresholds and saturation performance under I_C/I_B = 20.

The SOT323 package enables compact board layout while supporting junction temperatures up to 150 °C and thermal dissipation of 250 mW at T_S ≤ 124 °C - critical for space-constrained automotive body electronics and sensor interface modules.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - maximum collector-emitter voltage before breakdown; ensures safe operation in 24 V automotive supply rails with margin.
I_C	100 mA - continuous collector current rating; supports driving small relays, LEDs, or logic-level MOSFET gates.
V_CE(sat)	≤ 0.3 V at I_C = 10 mA / I_B = 0.5 mA - low saturation voltage minimizes power loss and self-heating in high-duty-cycle switching.
h_FE	120–630 at I_C = 5 mA / V_CE = 5 V - wide DC current gain range enables robust biasing across process and temperature variation.
R1	7–13 kΩ (typ. 10 kΩ) - integrated base resistor simplifies PCB layout and improves production yield vs. discrete resistor + transistor solutions.
f_T	150 MHz - transition frequency confirms suitability for medium-speed digital switching (e.g., PWM up to ~10 MHz).
AEC-Q101	Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22 standards.

Pinout & Package

SOT323 (SC-70) surface-mount package: 3-pin, gull-wing leads, 1.3 mm × 2.1 mm footprint, 0.65 mm pitch, 0.95 mm height. RoHS-compliant, Pb-free termination.

Pin/Terminal	Circuit Role	Design Meaning
1 (B)	Base	Connected internally to R1; accepts TTL/CMOS-compatible logic-level input (0.5–1.1 V turn-on).
2 (E)	Emitter	Common emitter node; tied to ground or low-side return path in standard switch configuration.
3 (C)	Collector	Switched output node; drives load between V_CC and collector with controlled saturation.

Key Features

Feature	Design Value
Integrated bias resistor R1	Reduces component count by one resistor per switch channel; eliminates solder joint risk and layout mismatch.
AEC-Q101 qualification	Validated for automotive under-hood applications including engine control modules and lighting drivers.
V_i(off) ≤ 1 V	Ensures reliable turn-off with standard microcontroller GPIOs even under noise or leakage conditions.
R_thJS ≤ 105 K/W	Enables higher sustained power density than SOT23 variants (e.g., BCR129), improving thermal headroom in dense layouts.

Applications

Automotive Door Module

Industrial Sensor Interface

Use Scenario: Controlling window lift motors and mirror adjustment actuators via MCU GPIOs.

IC Role / Device Role / Timing Role: Low-side switch translating 3.3 V/5 V logic signals into 12 V/24 V load drive.

Use Value: Eliminates need for external base resistor and reduces BOM cost per switch channel by 15%.

Use Scenario: Level-shifting and isolating analog sensor outputs (e.g., thermistor, potentiometer) before ADC sampling.

IC Role / Device Role / Timing Role: Digital buffer and current amplifier for weak sensor signals in noisy factory environments.

Use Value: Input hysteresis and guaranteed V_i(on)/V_i(off) margins prevent false triggering from EMI.

LED Driver for Dashboard

Smart HVAC Actuator Control

Use Scenario: Driving multiplexed LED backlight segments in instrument clusters with PWM dimming.

IC Role / Device Role / Timing Role: High-speed saturated switch operating at 1–5 kHz PWM frequencies.

Use Value: V_CE(sat) ≤ 0.3 V limits power dissipation to <15 mW per LED segment at 20 mA.

Use Scenario: Controlling stepper motor enable lines and position feedback switches in climate control dampers.

IC Role / Device Role / Timing Role: Logic-level translator and fault-isolated driver for safety-critical actuation paths.

Use Value: AEC-Q101 qualification ensures functional safety compliance without additional redundancy.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCR129E6327HTSA1	SOT23 package; R_thJS ≤ 240 K/W; P_tot = 200 mW at T_S ≤ 102 °C.	Lower power handling; suitable for lower ambient temperature or less thermally constrained designs.	Select when board space allows larger SOT23 and thermal budget permits reduced dissipation.
BC847BW	Standard NPN BJT (no built-in R1); requires external base resistor; h_FE = 200–450.	Higher design flexibility but increases component count and layout complexity.	Choose when precise bias tuning or multi-resistor networks are required for analog-linear operation.

Compared with BCR129E6327HTSA1, the BCR129WE6327HTSA1 offers 25% higher power rating and superior thermal resistance in a smaller SOT323 footprint; versus BC847BW, it trades external bias control for simplified layout and guaranteed switching thresholds.

Availability

BCR129WE6327HTSA1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, LED driver modules, and smart HVAC actuator control requiring stable component supply and AEC-Q101 assurance.

Supply support for BCR129WE6327HTSA1 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.

The BCR129 family belongs to Infineon's automotive-qualified digital transistor product line, engineered specifically for reliable, low-component-count switching in harsh-environment control units.

FAQ

What is the maximum allowable junction temperature for BCR129WE6327HTSA1?

The absolute maximum junction temperature (T_j) is 150 °C, as specified in the Absolute Maximum Ratings table. Operation above this limit risks permanent degradation of h_FE, V_CE(sat), and long-term reliability - especially under pulsed loads or elevated ambient conditions.

Can BCR129WE6327HTSA1 be used with 3.3 V microcontroller GPIOs?

Yes. Its V_i(on) range (0.5–1.1 V) and V_i(off) (0.4–1 V) ensure reliable turn-on with 3.3 V logic high and turn-off with logic low, even with typical GPIO output tolerances and PCB trace capacitance.

Is the built-in resistor R1 accessible externally?

No. R1 is monolithically integrated between the base terminal and internal transistor die; only the base (pin 1), emitter (pin 2), and collector (pin 3) are externally accessible. No external connection to R1 is possible.

How does thermal resistance R_thJS ≤ 105 K/W impact PCB layout?

This value assumes direct thermal conduction from the SOT323 package bottom to a copper pour or thermal pad. To achieve rated P_tot = 250 mW, at least 25 mm² of 1 oz. copper connected to pin 2 (emitter) is recommended, with no solder mask over the thermal pad area.

BCR129WE6327HTSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN - Pre-Biased

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

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

Resistor - Base (R1):: 10 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-SOT323

BCR129WE6327HTSA1 FAQ

1.How can I place an order for BCR129WE6327HTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCR129WE6327HTSA1 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 BCR129WE6327HTSA1 reliable?

The price and inventory of BCR129WE6327HTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCR129WE6327HTSA1 is usually 5 days.

3.What payment methods are accepted for BCR129WE6327HTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCR129WE6327HTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCR129WE6327HTSA1?

BCR129WE6327HTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCR129WE6327HTSA1 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 BCR129WE6327HTSA1?

For technical support, including BCR129WE6327HTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCR129WE6327HTSA1 requirements.

6.How does Aetrix verify that BCR129WE6327HTSA1 is sourced from the original manufacturer or authorized distributors?

All BCR129WE6327HTSA1 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 BCR129WE6327HTSA1 meets industry standards.

7.What is the process for return or replacement of BCR129WE6327HTSA1?

All BCR129WE6327HTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BCR129WE6327HTSA1, 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 BCR129WE6327HTSA1 part is unused and in its original packaging.

Return procedure for BCR129WE6327HTSA1:

1.Submit a request within 90 days.

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

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