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

Infineon Technologies BC857BE6433HTMA1

Name: BC857BE6433HTMA1
Brand: Infineon Technologies
SKU: BC857BE6433HTMA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC857BE6433HTMA1

Manufacturer:: Infineon Technologies

Category:: Single Bipolar Transistors

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

Datasheet:: BC857BE6433HTMA1.pdf

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

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Product details

Overview

BC857BE6433HTMA1 from Nexperia is a PNP silicon small-signal transistor designed for audio-frequency input stages and driver circuits. It delivers high DC current gain (h_FE = 220–480 at I_C = 2 mA), low V_CE(sat) (max 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 low-distortion preamplifier and level-shifting applications in automotive and industrial control modules.

For engineers reviewing the BC857BE6433HTMA1 datasheet, BC857BE6433HTMA1 pinout, BC857BE6433HTMA1 application, or BC857BE6433HTMA1 equivalent, key selection criteria include verified h_FE group B performance, SOT23 package thermal resistance (R_thJS ≤ 240 K/W), AEC-Q101 qualification, and complementary NPN pairing with BC847B.

Technical Context

This device operates as a general-purpose PNP bipolar junction transistor with fixed emitter-base and collector-base junctions optimized for linear amplification and switching below 250 MHz. Its h_FE grouping (B) ensures consistent current amplification across production lots, while the 45 V V_CEO rating supports operation in 24 V industrial bus interfaces and 12 V automotive signal conditioning paths.

Thermal design is constrained by its SOT23 package's R_thJS ≤ 240 K/W and P_tot = 330 mW at T_S ≤ 71 °C. The 1.5 pF C_cb and 8 pF C_eb values enable stable gain up to 100 kHz without external compensation in single-stage amplifier configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Supports operation in 24 V supply rails with 2× safety margin
h_FE (I_C = 2 mA)	220–480 - Enables precise biasing in Class-A preamp stages with minimal spread
V_CE(sat)	≤ 300 mV - Reduces power loss in active-low switch and level-shift applications
f_T	250 MHz - Ensures adequate bandwidth for audio harmonics and fast digital edge shaping
Noise Figure	1–4 dB - Meets low-noise requirements for microphone preamps and sensor signal chains
R_thJS	≤ 240 K/W - Allows direct PCB copper pour cooling without heatsink in space-constrained layouts
AEC-Q101 Qualified	Yes - Validated for automotive electronics per stress test requirements (HTOL, TC, HAST)

Pinout & Package

BC857BE6433HTMA1 is housed in a standard SOT23 plastic surface-mount package with gull-wing leads, rated for reflow soldering per JEDEC J-STD-020.

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 bias
2 (Emitter)	Reference terminal for current source/sink	Connected to higher potential rail in PNP configuration; defines common reference for V_BE bias
3 (Collector)	Output current path	Sinks load current when base is pulled low; polarity inverted relative to NPN counterpart

Key Features

Feature	Design Value
High h_FE group B	Guarantees 220–480 gain at I_C = 2 mA, enabling predictable bias point setting in discrete amplifier designs
Low V_CE(sat)	Max 300 mV at I_C/I_B = 10/0.5 mA - minimizes voltage drop in active-low logic interface and LED driver saturation
Low-noise operation	F = 1–4 dB at 1 kHz - preserves SNR in analog front-end stages where op-amp headroom is limited
AEC-Q101 qualification	Validated for automotive under-hood and cabin electronics, including temperature cycling and humidity testing
Pb-free & RoHS compliant	Meets EU Directive 2011/65/EU; compatible with lead-free reflow profiles and halogen-free board assembly

Applications

Automotive Door Module

Industrial PLC Input Stage

Use Scenario: Signal inversion and level translation of 12 V switch inputs to 3.3 V microcontroller GPIO.

IC Role / Device Role / Timing Role: PNP switch configured in emitter-follower mode to provide active-low open-collector output compatibility.

Use Value: Low V_CE(sat) ensures <100 mV residual drop at 5 mA load, preserving noise margin for MCU input threshold detection.

Use Scenario: Isolation and amplification of 24 V field sensor signals before ADC sampling.

IC Role / Device Role / Timing Role: Common-emitter preamplifier stage with fixed bias network to condition millivolt-level thermocouple outputs.

Use Value: 1–4 dB noise figure and 220+ h_FE maintain >60 dB SNR over 20 Hz–20 kHz bandwidth without op-amp overhead.

Audio Tone Control Circuit

Power Supply Enable Sequencing

Use Scenario: Discrete Baxandall tone stack driver in battery-powered portable audio equipment.

IC Role / Device Role / Timing Role: Linear amplifier stage operating in Class-A with I_C = 1 mA, biased via resistive divider.

Use Value: Stable h_FE group B and low C_cb (1.5 pF) prevent phase shift-induced peaking in feedback networks up to 10 kHz.

Use Scenario: Controlled turn-on of auxiliary 5 V rail after main 12 V supply stabilizes in multi-rail embedded system.

IC Role / Device Role / Timing Role: Active-low enable switch driving gate of external PMOS high-side FET.

Use Value: 45 V V_CEO withstands transient overshoot on 12 V rail; 330 mW P_tot supports continuous 10 mA base drive without derating.

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
BC857B,115 (Nexperia)	Same die, identical h_FE group B, but in standard SOT23 (no E6433HTMA1 tape-and-reel variant code)	No functional difference; differs only in packaging format and reel marking	Select when standard reel logistics or non-HTMA1 traceability is acceptable
MMBT857LT1G (onsemi)	h_FE range 200–450 (slightly lower min), V_CEO = 45 V, R_thJS = 250 K/W, AEC-Q101 qualified	Compatible in most linear and switching roles, but marginally higher thermal resistance affects high-duty-cycle pulse operation	Choose for dual-sourcing where onsemi supply chain alignment is required

Compared with BC857BE6433HTMA1, BC857B,115 offers identical electrical behavior with standard packaging logistics, while MMBT857LT1G provides cross-manufacturer redundancy with minor thermal and gain tolerance trade-offs in high-reliability designs.

Availability

BC857BE6433HTMA1 is available at Aetrix Electronics and suitable for automotive door modules, industrial PLC input stages, audio tone control circuits, and power supply enable sequencing requiring stable component supply and AEC-Q101 compliance.

Supply support for BC857BE6433HTMA1 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with manufacturing rooted in process control and automotive-grade quality systems.

BC857BE6433HTMA1 belongs to the BC856–BC860 family of PNP transistors engineered for cost-sensitive, space-constrained AF amplification and switching in automotive and industrial environments.

FAQ

What is the maximum allowable junction temperature for BC857BE6433HTMA1?

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, increased leakage, and bond wire failure. Derating begins at T_S > 71 °C due to its SOT23 package's thermal resistance profile.

Is BC857BE6433HTMA1 pin-compatible with BC847B NPN transistors?

Yes - both use SOT23 packages with identical pinout (1=Base, 2=Emitter, 3=Collector for BC857B; 1=Base, 2=Emitter, 3=Collector for BC847B). However, polarity reversal means circuit topology must invert supply connections and bias networks to maintain functional equivalence.

Does BC857BE6433HTMA1 support lead-free reflow soldering?

Yes - it is Pb-free and RoHS compliant, qualified for JEDEC J-STD-020D Level 1 moisture sensitivity, and rated for peak reflow temperatures up to 260 °C. No special pre-bake is required for standard assembly processes.

How does the h_FE group B specification affect circuit design?

Group B guarantees h_FE between 220 and 480 at I_C = 2 mA and V_CE = 5 V, enabling tighter bias resistor tolerances and reduced need for gain-trimming components. This allows predictable quiescent current setting in Class-A amplifiers and reliable saturation in switching applications without iterative prototyping.

BC857BE6433HTMA1 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:: 650mV @ 5mA, 100mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 220 @ 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

BC857BE6433HTMA1 FAQ

1.How can I place an order for BC857BE6433HTMA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC857BE6433HTMA1 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 BC857BE6433HTMA1 reliable?

The price and inventory of BC857BE6433HTMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857BE6433HTMA1 is usually 5 days.

3.What payment methods are accepted for BC857BE6433HTMA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857BE6433HTMA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC857BE6433HTMA1?

BC857BE6433HTMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC857BE6433HTMA1 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 BC857BE6433HTMA1?

For technical support, including BC857BE6433HTMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857BE6433HTMA1 requirements.

6.How does Aetrix verify that BC857BE6433HTMA1 is sourced from the original manufacturer or authorized distributors?

All BC857BE6433HTMA1 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 BC857BE6433HTMA1 meets industry standards.

7.What is the process for return or replacement of BC857BE6433HTMA1?

All BC857BE6433HTMA1 units undergo pre-shipment inspection (PSI). If there is an issue with BC857BE6433HTMA1, 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 BC857BE6433HTMA1 part is unused and in its original packaging.

Return procedure for BC857BE6433HTMA1:

1.Submit a request within 90 days.

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

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