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

Infineon Technologies BC857CWH6433XTMA1

Name: BC857CWH6433XTMA1
Brand: Infineon Technologies
SKU: BC857CWH6433XTMA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC857CWH6433XTMA1

Manufacturer:: Infineon Technologies

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: BC857CWH6433XTMA1.pdf

Description:: TRANS PNP 45V 0.1A PG-SOT323

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Product details

Overview

BC857CWH6433XTMA1 from Infineon Technologies is a PNP silicon small-signal transistor designed for audio-frequency input stages and driver circuits. It delivers high DC current gain (h_FE = 420–520 at I_C = 2 mA), low V_CE(sat) (≤300 mV at I_C = 10 mA, I_B = 0.5 mA), and low noise (F = 1–4 dB at 1 kHz), making it suitable for precision analog amplification in automotive sensor interfaces.

For engineers reviewing the BC857CWH6433XTMA1 datasheet, BC857CWH6433XTMA1 pinout, BC857CWH6433XTMA1 application, or BC857CWH6433XTMA1 equivalent, key selection criteria include guaranteed h_FE group C performance, AEC-Q101 qualification, SOT323 package thermal resistance (R_thJS ≤ 90 K/W), and V_CEO = 45 V rating for 12 V automotive rail compatibility.

Technical Context

This PNP transistor operates with emitter-grounded common-emitter configuration, supporting linear amplification and switching functions. Its h_FE group C guarantees minimum DC current gain of 420 at I_C = 2 mA and V_CE = 5 V, and typical f_T of 250 MHz enables stable operation up to mid-VHF range.

Thermal design is enabled by R_thJS ≤ 90 K/W (TS ≤ 128 °C) and T_j max = 150 °C, while low-noise characteristics (F = 1 dB typ. at I_C = 0.2 mA, f = 1 kHz) stem from optimized epitaxial base doping and geometry.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Supports operation across 12 V automotive systems with margin against load-dump transients.
h_FE (I_C = 2 mA)	420–520 - Ensures predictable bias stability and minimal base drive current in amplifier stages.
V_CE(sat)	≤300 mV - Reduces conduction loss and self-heating in active-low switch or level-shifting applications.
f_T	250 MHz typ. - Enables reliable small-signal amplification up to FM radio band without gain roll-off.
Noise Figure	1–4 dB - Meets low-noise requirements for microphone preamps and sensor signal conditioning.
R_thJS	≤90 K/W - Allows 250 mW power dissipation at junction-to-soldering-point interface under defined PCB layout.
AEC-Q101 Qualified	Yes - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and temperature cycling.

Pinout & Package

BC857CWH6433XTMA1 is housed in a RoHS-compliant SOT323 (SC-70) plastic surface-mount package, measuring 2.1 mm × 2.0 mm × 0.95 mm, with gull-wing leads optimized for automated reflow assembly and thermal reliability in space-constrained PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or lower-potential node; defines reference for V_BE and current flow direction.
2 (Base)	Control input	Receives forward-biased current to modulate collector current; requires external bias network for stable Q-point.
3 (Collector)	Output current source	Supplies amplified current to load; polarity inverted relative to base input in common-emitter configuration.

Key Features

Feature	Design Value
High h_FE group C	Guaranteed 420–520 gain ensures consistent DC bias and reduced base resistor sensitivity in production designs.
Low V_CE(sat)	≤300 mV at I_C/I_B = 20 enables efficient switching in active-low logic translators and LED drivers.
Low-noise operation	F = 1 dB typ. at 1 kHz supports high-SNR front-end amplification for analog sensors and audio paths.
AEC-Q101 qualification	Validated for automotive use including temperature cycling, humidity, and mechanical shock per JEDEC standards.
SOT323 thermal performance	R_thJS ≤ 90 K/W allows 250 mW continuous dissipation with minimal board-level copper requirement.

Applications

Automotive Cabin Sensors

Industrial Signal Conditioning

Use Scenario: Amplifying low-level output from MEMS pressure or humidity sensors in HVAC control modules.

IC Role / Device Role / Timing Role: PNP small-signal amplifier in common-emitter configuration with fixed emitter degeneration.

Use Value: High h_FE and low noise preserve signal integrity over 0–100 °C ambient range while meeting AEC-Q101 reliability.

Use Scenario: Level-shifting and buffering analog signals between isolated 3.3 V microcontroller inputs and 24 V field sensors.

IC Role / Device Role / Timing Role: Active-low interface transistor providing voltage translation and current gain.

Use Value: Low V_CE(sat) minimizes offset error and power loss; SOT323 footprint saves board area in multi-channel I/O modules.

Audio Input Stages

Power Supply Sequencing

Use Scenario: First-stage preamplifier in portable infotainment head units handling microphone or line-in signals.

IC Role / Device Role / Timing Role: Linear PNP amplifier with emitter-follower or common-emitter topology.

Use Value: 1 dB noise figure and 250 MHz f_T support wideband fidelity up to 20 kHz with minimal distortion.

Use Scenario: Enabling/disabling auxiliary power rails during cold-start sequencing in ADAS domain controllers.

IC Role / Device Role / Timing Role: Discrete PNP switch controlling gate/base of downstream MOSFETs or regulators.

Use Value: Guaranteed h_FE ≥420 ensures robust turn-on margin across temperature; V_CEO = 45 V covers worst-case rail overshoot.

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
BC857C,115 (Nexperia)	Same h_FE group C, identical SOT323 package, but not AEC-Q101 qualified.	Limited to industrial/commercial grade designs; lacks automotive stress validation.	Select when cost sensitivity outweighs automotive qualification requirements.
MMBT857LT1G (ON Semiconductor)	h_FE min = 250 (group B), higher V_CEO = 60 V, same SOT23-3 package (not SOT323).	Requires PCB redesign due to different footprint; better for higher-voltage non-automotive applications.	Choose only if board layout allows SOT23 and system voltage exceeds 45 V.

Compared with BC857CWH6433XTMA1, BC857C,115 offers identical electrical specs but no automotive qualification, while MMBT857LT1G trades guaranteed h_FE and package compatibility for higher breakdown voltage and non-automotive sourcing.

Availability

BC857CWH6433XTMA1 is available at Aetrix Electronics and suitable for automotive cabin sensors, industrial signal conditioners, audio input stages, and power supply sequencers requiring stable component supply and long-term lifecycle assurance.

Supply support for BC857CWH6433XTMA1 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 electronics, and industrial control ICs, with global manufacturing and quality certification infrastructure.

This device belongs to Infineon's BC856–BC860 family of AEC-Q101-qualified PNP transistors, engineered specifically for high-reliability analog signal processing and discrete switching in automotive ECUs and body electronics.

FAQ

What is the maximum operating junction temperature for BC857CWH6433XTMA1?

The absolute maximum junction temperature is 150 °C, validated per AEC-Q101 thermal stress testing. Operation above this limit risks permanent degradation of h_FE, leakage current, and beta stability. Derating curves in the datasheet define safe power limits versus board temperature (T_S ≤ 128 °C for 250 mW).

Is BC857CWH6433XTMA1 pin-compatible with BC847C?

No - BC857CWH6433XTMA1 is a PNP transistor in SOT323 package with pinout E-B-C (1-2-3), while BC847C is an NPN device with identical pinout but opposite polarity. Direct substitution would reverse circuit functionality and likely cause failure; complementary pairing is intentional, not drop-in compatible.

Does BC857CWH6433XTMA1 support pulsed operation beyond its DC power rating?

Yes - permissible pulse load ratio (P_tot(max)/P_tot(DC)) reaches 5× for pulse widths ≤10 µs (duty cycle ≤0.5%), enabling short-duration surge handling in protection circuits. Pulse derating must follow the manufacturer's transient thermal impedance curve (R_thJS vs. t_p) to avoid junction overheating.

How does the h_FE group C specification impact circuit design?

Group C guarantees h_FE ≥420 at I_C = 2 mA and V_CE = 5 V, allowing designers to size base resistors with confidence and minimize gain variation across temperature (−40 to +150 °C). This eliminates need for gain-trimming components in production-grade automotive amplifiers and switches.

BC857CWH6433XTMA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

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

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

Vce Saturation (Max) @ Ib, Ic:: 650mV @ 5mA, 100mA

Current - Collector Cutoff (Max):: 15nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 420 @ 2mA, 5V

Power - Max:: 250 mW

Frequency - Transition:: 250MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT323

BC857CWH6433XTMA1 FAQ

1.How can I place an order for BC857CWH6433XTMA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC857CWH6433XTMA1 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 BC857CWH6433XTMA1 reliable?

The price and inventory of BC857CWH6433XTMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857CWH6433XTMA1 is usually 5 days.

3.What payment methods are accepted for BC857CWH6433XTMA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857CWH6433XTMA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC857CWH6433XTMA1?

BC857CWH6433XTMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC857CWH6433XTMA1 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 BC857CWH6433XTMA1?

For technical support, including BC857CWH6433XTMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857CWH6433XTMA1 requirements.

6.How does Aetrix verify that BC857CWH6433XTMA1 is sourced from the original manufacturer or authorized distributors?

All BC857CWH6433XTMA1 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 BC857CWH6433XTMA1 meets industry standards.

7.What is the process for return or replacement of BC857CWH6433XTMA1?

All BC857CWH6433XTMA1 units undergo pre-shipment inspection (PSI). If there is an issue with BC857CWH6433XTMA1, 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 BC857CWH6433XTMA1 part is unused and in its original packaging.

Return procedure for BC857CWH6433XTMA1:

1.Submit a request within 90 days.

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

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