Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Nexperia USA Inc. BC859BW,135

Name: BC859BW,135
Brand: Nexperia USA Inc.
SKU: BC859BW,135
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BC859BW,135

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: BC859BW,135.pdf

Description:: TRANS PNP 30V 0.1A SOT-323

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:9,643

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BC859BW,135 from Nexperia is a PNP general-purpose bipolar junction transistor in SOT323 package, rated for −30 V V_CBO, −30 V V_CEO, and −100 mA I_C, with DC current gain (h_FE) of 220–475 at −2 mA I_C, used in low-noise audio-frequency amplifier stages and signal conditioning circuits.

For engineers reviewing the BC859BW,135 datasheet, BC859BW,135 pinout, BC859BW,135 application, or BC859BW,135 equivalent, key selection criteria include its PNP polarity, SOT323 footprint compatibility, −300 mV V_CEsat at −10 mA/−0.5 mA drive, 4 dB noise figure at 1 kHz, and thermal resistance of 625 K/W on FR4 PCB.

Technical Context

This transistor operates as a low-voltage, low-current PNP switch or linear amplifier with fixed-emitter biasing capability. Its h_FE range (220–475) supports stable DC biasing across production lots, and its 5 pF collector capacitance enables use in audio-band amplification without high-frequency roll-off.

The device features a maximum junction temperature of 150 °C and storage temperature range of −65 to +150 °C, making it suitable for industrial ambient environments. Its 4 dB noise figure at 1 kHz with 2 kΩ source resistance confirms suitability for low-noise preamplifier input stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CBO	−30 V - maximum reverse collector-base voltage before breakdown; defines safe operation with open emitter
V_CEO	−30 V - maximum collector-emitter voltage with open base; sets upper limit for supply rail in PNP common-emitter stage
I_C (DC)	−100 mA - continuous collector current rating; determines max load-handling capacity in switching or amplification
h_FE	220–475 - DC current gain at −2 mA I_C/−5 V V_CE; ensures predictable base drive requirements for bias design
V_CEsat	−300 mV - saturation voltage at −10 mA I_C/−0.5 mA I_B; minimizes power loss in switching applications
Noise Figure	4 dB - measured at 1 kHz, 200 μA I_C, 2 kΩ R_S; qualifies device for low-noise audio preamp input stages
R_{th j-a}	625 K/W - thermal resistance on FR4 board; informs heatsinking needs and power derating above 25 °C ambient

Pinout & Package

BC859BW,135 is housed in a surface-mount SOT323 (SC-70) plastic package measuring 2.2 mm × 1.35 mm × 0.95 mm, with gull-wing leads and 0.65 mm pitch.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased PNP operation; requires negative voltage relative to emitter to turn on
2	Emiter	Current source terminal in PNP configuration; connected to higher potential (e.g., V_CC) in common-emitter amplifier
3	Collector	Current sink terminal; output node where amplified or switched current flows toward lower potential (e.g., ground)

Key Features

Feature	Design Value
Low-noise performance	4 dB noise figure at 1 kHz enables use in sensitive audio preamplifier inputs without added noise degradation
Wide h_FE range	220–475 supports robust DC bias design across manufacturing variation while maintaining gain stability
Low V_CEsat	−300 mV at −10 mA/−0.5 mA reduces conduction loss and self-heating in linear or switching modes
SOT323 footprint	Standardized 3-pin SC-70 package allows drop-in replacement and automated assembly on space-constrained PCBs

Applications

Audio Preamp Stage

Tape Recorder Signal Path

Use Scenario: First-stage amplification of microphone or phono-level signals in portable audio devices.

IC Role / Device Role / Timing Role: PNP small-signal amplifier providing high-input-impedance, low-noise gain with minimal distortion.

Use Value: 4 dB noise figure and 220–475 h_FE ensure clean signal amplification without degrading SNR in battery-powered systems.

Use Scenario: Bias and amplification circuitry in analog cassette playback/recording electronics.

IC Role / Device Role / Timing Role: Linear PNP transistor used in differential pair or emitter-follower configurations for head amplification.

Use Value: −30 V V_CEO and −300 mV V_CEsat support reliable operation under varying tape head impedance and supply conditions.

Hi-Fi Amplifier Input

Industrial Sensor Interface

Use Scenario: Input buffer and gain stage in compact stereo receiver front-end designs.

IC Role / Device Role / Timing Role: Low-distortion PNP amplifier configured in common-emitter or common-collector topology.

Use Value: 5 pF collector capacitance and 100 MHz f_T preserve audio bandwidth up to 20 kHz with flat response.

Use Scenario: Signal conditioning for thermistor or RTD-based temperature monitoring in factory automation modules.

IC Role / Device Role / Timing Role: PNP current source or level-shifting element in analog front-end signal chains.

Use Value: −65 °C to +150 °C operating temperature range and 150 °C T_j rating ensure reliability in unregulated industrial enclosures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC857BW,135	V_CEO = −45 V, h_FE = 220–475, same SOT323 package	Higher breakdown voltage supports wider supply rails; identical noise and gain specs	Select when system V_CC exceeds 30 V or transient overvoltage margin is required
MMBT3906LT1G	V_CEO = −40 V, h_FE = 100–300, SOT23 package	Larger SOT23 footprint; lower h_FE min and higher V_CEsat (−400 mV)	Choose only if SOT23 layout exists and reduced gain/noise performance is acceptable

Compared with BC859BW,135, BC857BW,135 offers higher voltage tolerance without sacrificing noise or gain, while MMBT3906LT1G trades package compatibility and noise performance for broader industry availability in SOT23.

Availability

BC859BW,135 is available at Aetrix Electronics and suitable for audio preamplifiers, tape recorder signal paths, and industrial sensor interfaces requiring stable component supply and consistent parametric performance across production batches.

Supply support for BC859BW,135 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 leader in discrete, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, consumer, and wearable markets with high-volume, high-reliability components.

BC859BW,135 belongs to Nexperia's general-purpose bipolar transistor product line, engineered for cost-sensitive, high-yield audio and signal-conditioning applications where low noise, stable h_FE, and SOT323 manufacturability are critical.

FAQ

Is BC859BW,135 pin-compatible with BC849W?

No - BC859BW,135 is a PNP transistor with pinout Base–Emitter–Collector (1–2–3), while BC849W is its NPN complement with identical SOT323 pinout but opposite polarity. They share footprint and mechanical compatibility but require circuit-level polarity reversal for functional substitution.

What is the maximum allowable power dissipation at 70 °C ambient?

At 70 °C ambient, derated power dissipation is 120 mW, calculated using P_tot = 200 mW − [(70 − 25) × (200 mW / 625 K/W)] = 200 − 14.4 = 185.6 mW - but limited by absolute max rating of 200 mW and practical thermal limits; 120 mW ensures safe margin below T_j = 150 °C.

Does BC859BW,135 support operation at 150 °C junction temperature?

Yes - the datasheet specifies T_j (max) = 150 °C and T_stg = −65 to +150 °C. Operation at full 150 °C junction temperature is permitted provided ambient and power dissipation remain within thermal limits defined by R_{th j-a} = 625 K/W and derated P_tot.

How does the 4 dB noise figure compare to BC859CW,135?

Both BC859BW,135 and BC859CW,135 specify 4 dB noise figure under identical test conditions (I_C = −200 μA, V_CE = −5 V, R_S = 2 kΩ, 1 kHz). The difference lies in h_FE: BC859CW,135 has higher gain (420–800), but noise performance is unchanged per datasheet.

BC859BW,135 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

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

Voltage - Collector Emitter Breakdown (Max):: 30 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:: 200 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

BC859BW,135 FAQ

1.How can I place an order for BC859BW,135 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC859BW,135 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 BC859BW,135 reliable?

The price and inventory of BC859BW,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC859BW,135 is usually 5 days.

3.What payment methods are accepted for BC859BW,135?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC859BW,135 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC859BW,135?

BC859BW,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC859BW,135 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 BC859BW,135?

For technical support, including BC859BW,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC859BW,135 requirements.

6.How does Aetrix verify that BC859BW,135 is sourced from the original manufacturer or authorized distributors?

All BC859BW,135 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 BC859BW,135 meets industry standards.

7.What is the process for return or replacement of BC859BW,135?

All BC859BW,135 units undergo pre-shipment inspection (PSI). If there is an issue with BC859BW,135, 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 BC859BW,135 part is unused and in its original packaging.

Return procedure for BC859BW,135:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…