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. BCX71J,235

Name: BCX71J,235
Brand: Nexperia USA Inc.
SKU: BCX71J,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BCX71J,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BCX71J,235.pdf

Description:: TRANS PNP 45V 0.1A TO-236AB

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:8,641

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

Product details

Overview

BCX71J,235 from Nexperia is a PNP general-purpose bipolar junction transistor in SOT23 package, rated for −45 V V_CEO, −100 mA I_C, and 250 mW P_tot, with h_FE = 250–460 at I_C = −2 mA, used in low-noise, low-frequency amplification and switching within hybrid analog circuits.

For engineers reviewing the BCX71J,235 datasheet, BCX71J,235 pinout, BCX71J,235 application, or BCX71J,235 equivalent, key selection criteria include verified DC current gain at multiple bias points, collector-emitter saturation voltage under defined drive conditions, thermal resistance (500 K/W), noise figure (2–6 dB), and SOT23 footprint compatibility with space-constrained PCB layouts.

Technical Context

This PNP transistor operates in linear amplification and saturated switching modes, with base-emitter and collector-base junctions optimized for low-noise performance at frequencies up to 100 MHz (f_T). Its design targets stable DC biasing across −65 °C to +150 °C ambient range.

It features low leakage (ICBO ≤ −20 nA at VCB = −45 V, 25 °C) and tight h_FE distribution across BCX71 variants-BCX71J offers mid-range gain (250–460) between BCX71H (180–310) and BCX71K (380–630), enabling predictable gain staging in multi-transistor amplifier chains.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−45 V: Maximum safe collector-emitter voltage before breakdown in open-base configuration.
I_C (DC)	−100 mA: Continuous collector current limit defining usable linear/saturation operating envelope.
h_FE	250–460 @ I_C = −2 mA, V_CE = −5 V: Confirmed DC current gain range for stable small-signal amplification.
V_CE(sat)	−250 mV max @ I_C = −10 mA, I_B = −0.25 mA: Low saturation voltage enabling efficient switching with minimal power loss.
f_T	100 MHz: Transition frequency confirming usable bandwidth for audio and low-RF signal amplification.
R_th(j-a)	500 K/W: Thermal resistance from junction to ambient on FR4 PCB, defining derating curve for power handling.
F (Noise)	2–6 dB @ I_C = −200 μA, RS = 2 kΩ, 1 kHz: Verified low-noise performance critical for preamplifier stages.

Pinout & Package

BCX71J,235 is housed in a plastic surface-mount SOT23 (TO-236AB) package measuring 2.9 × 1.3 × 1.0 mm, with gull-wing leads and standard JEDEC outline.

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

Key Features

Feature	Design Value
Low-noise amplification	Noise figure 2–6 dB enables use in microphone preamps and sensor signal conditioning without added noise floor.
Stable gain across bias	h_FE maintained 250–460 at I_C = −2 mA and 100–110 at I_C = −50 mA, supporting consistent performance from small-signal to medium-power stages.
SOT23 footprint compatibility	Standard 3-pin SOT23 outline ensures drop-in replacement capability and compatibility with automated pick-and-place assembly.
High-temperature operation	Rated T_j = 150 °C and T_amb = −65 to +150 °C supports reliability in automotive under-hood and industrial control environments.

Applications

Audio Pre-amplifier Stage

Low-Voltage Switching Load

Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors in portable audio devices.

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

Use Value: 2–6 dB noise figure and 250–460 h_FE ensure high SNR and stable gain without external trimming.

Use Scenario: Driving LED indicators or small relays from 3.3 V or 5 V logic outputs in industrial HMIs.

IC Role / Device Role / Timing Role: Saturated PNP switch controlling current flow from positive rail to load.

Use Value: −250 mV V_CE(sat) at −10 mA reduces conduction loss and self-heating in continuous duty cycles.

Hybrid Analog Filter Node

Temperature-Stable Bias Generator

Use Scenario: Implementing active RC filter sections in mixed-signal sensor interface modules requiring low drift.

IC Role / Device Role / Timing Role: Transconductance element in OTA-like configuration with fixed emitter resistor.

Use Value: Tight h_FE tolerance and low ICBO (≤ −20 nA) minimize temperature-induced gain and offset drift.

Use Scenario: Generating stable reference currents for precision ADC drivers or DAC output buffers.

IC Role / Device Role / Timing Role: Current source configured with base bias network and emitter resistor.

Use Value: 500 K/W R_th(j-a) and 150 °C T_j rating allow sustained operation in thermally dense PCB regions.

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
BC856B,215	Higher h_FE (220–475), same SOT23, −65 V V_CEO, −100 mA I_C	Better suited for higher-gain amplification; less ideal where mid-gain stability is required.	Select when higher DC gain is needed without changing layout; verify V_CEO margin against system voltage.
MMBT3906LT1G	Same V_CEO/I_C, h_FE = 100–300, slightly higher V_CE(sat) (−400 mV typ)	Lower gain consistency and higher saturation voltage reduce efficiency in low-voltage switching.	Prefer for cost-sensitive designs where tighter h_FE spread is not critical and thermal headroom exists.

Compared with BCX71J,235, BC856B,215 offers extended voltage margin but looser gain targeting, while MMBT3906LT1G trades gain stability and saturation performance for broader availability-making BCX71J,235 optimal for noise-sensitive, gain-critical analog nodes.

Availability

BCX71J,235 is available at Aetrix Electronics and suitable for audio pre-amplifier stages, low-voltage switching loads, hybrid analog filter nodes, and temperature-stable bias generators requiring stable component supply and long-term manufacturability.

Supply support for BCX71J,235 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, formed in 2017 from the former NXP Standard Products division, with focus on automotive, industrial, computing, and consumer markets.

The BCX71 series belongs to Nexperia's general-purpose bipolar transistor product line, designed specifically for reliable low-noise amplification and robust low-voltage switching in space-constrained, thermally demanding applications.

FAQ

What is the maximum junction temperature for BCX71J,235?

The absolute maximum junction temperature (T_j) for BCX71J,235 is 150 °C, as specified in the Absolute Maximum Ratings table. This value defines the upper thermal limit for reliable operation; exceeding it risks permanent degradation of h_FE, leakage, or bond wire failure. Derating is required above Tamb = 25 °C per the 500 K/W thermal resistance.

Is BCX71J,235 pin-compatible with BCX70J?

Yes-BCX71J,235 (PNP) and BCX70J (NPN) share identical SOT23 pinout (1=base, 2=emitter, 3=collector), enabling complementary pair usage in push-pull or differential amplifier designs. However, polarity reversal must be accounted for in biasing and signal routing; they are not functional substitutes.

Does BCX71J,235 support automotive-grade qualification?

BCX71J,235 is not explicitly qualified to AEC-Q101, though its specification range (T_amb = −65 to +150 °C, T_j = 150 °C) meets many automotive under-hood thermal requirements. For production automotive use, consult Nexperia's official AEC-Q101 qualified equivalents such as the PBSS4041P or PUMD12.

What is the typical noise figure at 10 kHz?

The datasheet specifies noise figure only at 1 kHz (2–6 dB). At 10 kHz, noise performance improves slightly due to reduced 1/f contribution, but no published value exists. For 10 kHz design, interpolate conservatively from the 1 kHz and 100 MHz f_T data-expect ~1.5–5 dB depending on bias and source impedance.

BCX71J,235 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

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:: 250 @ 2mA, 5V

Power - Max:: 250 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BCX71J,235 FAQ

1.How can I place an order for BCX71J,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCX71J,235 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 BCX71J,235 reliable?

The price and inventory of BCX71J,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX71J,235 is usually 5 days.

3.What payment methods are accepted for BCX71J,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX71J,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCX71J,235?

BCX71J,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCX71J,235 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 BCX71J,235?

For technical support, including BCX71J,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX71J,235 requirements.

6.How does Aetrix verify that BCX71J,235 is sourced from the original manufacturer or authorized distributors?

All BCX71J,235 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 BCX71J,235 meets industry standards.

7.What is the process for return or replacement of BCX71J,235?

All BCX71J,235 units undergo pre-shipment inspection (PSI). If there is an issue with BCX71J,235, 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 BCX71J,235 part is unused and in its original packaging.

Return procedure for BCX71J,235:

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…