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

Nexperia USA Inc. BCX56,135

Name: BCX56,135
Brand: Nexperia USA Inc.
SKU: BCX56,135
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCX56,135

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: BCX56,135.pdf

Description:: TRANS NPN 80V 1A SOT-89

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BCX56,135 from Nexperia is an NPN medium power transistor in SOT89 (SC-62) surface-mount package, rated for 80 V V_CEO, 1 A continuous collector current, and 1.35 W total power dissipation on 6 cm² copper pad - used as low-side switch or MOSFET driver in battery-powered linear regulators and power management circuits.

For engineers reviewing the BCX56,135 datasheet, BCX56,135 pinout, BCX56,135 application, or BCX56,135 equivalent, this device supports high-current switching at elevated ambient temperatures, offers three h_FE variants (63–250), and delivers stable DC gain across -55 °C to +150 °C junction range with verified thermal performance on FR4 PCBs.

Technical Context

This transistor operates as a single-element NPN bipolar junction device optimized for medium-power linear and switching applications. Its structure supports pulsed peak collector current up to 2 A (tp ≤ 1 ms) and base-emitter breakdown voltage of 5 V, enabling robust drive capability in low-side configurations where fast turn-on and controlled saturation are required.

Thermal design is defined by three mounting conditions: standard footprint (250 K/W R_th(j-a)), 1 cm² collector pad (132 K/W), and 6 cm² pad (93 K/W). The device exhibits f_T = 100–180 MHz and C_c = 6 pF, confirming suitability for moderate-frequency switching and analog amplification up to ~100 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum safe collector-emitter voltage with open base; defines upper rail limit in low-side switch or regulator output stage.
I_C	1 A continuous - Sustained collector current rating at T_amb ≤ 25 °C; determines load-driving capacity in power management blocks.
h_FE	63–250 - DC current gain range at V_CE = 2 V, I_C = 150 mA; enables precise base drive sizing for predictable saturation behavior.
V_CE(sat)	≤ 0.5 V at I_C = 500 mA, I_B = 50 mA - Low saturation voltage minimizes conduction loss in switching applications.
P_tot	1.35 W - Max power dissipation with 6 cm² copper pad; sets thermal margin for continuous operation in compact PCB layouts.
f_T	100–180 MHz - Transition frequency confirms usable bandwidth for audio amplification and gate driving of power MOSFETs.
R_th(j-a)	93 K/W - Junction-to-ambient thermal resistance with 6 cm² collector pad; enables thermal modeling for derating above 25 °C ambient.

Pinout & Package

SOT89 (SC-62) plastic surface-mount package: 4.5 mm × 2.5 mm × 1.5 mm body, 1.5 mm lead pitch, flat lead configuration with exposed collector tab for thermal conduction.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter (E)	Current return path; connected to ground or low-side reference node in switching topologies.
2	Collector (C)	Main power output terminal; electrically and thermally tied to PCB copper pad for heat dissipation.
3	Base (B)	Control input; requires current-limited drive (max I_B = 0.3 A) to achieve full saturation without overdrive.

Key Features

Feature	Design Value
High collector current capability	1 A continuous / 2 A pulsed - supports sustained load switching and transient surge handling in portable power rails.
Three h_FE selections	BCX56 (63–250), BCX56-10 (63–160), BCX56-16 (100–250) - allows precise base drive optimization across production batches and temperature ranges.
High power dissipation	1.35 W with 6 cm² copper - enables use in space-constrained designs without active cooling in industrial and consumer power stages.
Robust thermal performance	R_th(j-sp) = 16 K/W - low junction-to-solder-point resistance ensures rapid heat transfer into PCB substrate during pulse operation.

Applications

Linear Voltage Regulators

MOSFET Drivers

Use Scenario: Pass transistor in adjustable linear regulators delivering up to 1 A output current.

IC Role / Device Role / Timing Role: NPN series pass element controlling output voltage via base bias network.

Use Value: Low V_CE(sat) reduces dropout voltage; high h_FE simplifies base drive circuitry and improves regulation accuracy.

Use Scenario: Gate driver stage for N-channel power MOSFETs in DC-DC converters or motor control H-bridges.

IC Role / Device Role / Timing Role: Medium-current buffer amplifying logic-level signals to deliver ≥50 mA peak gate charge current.

Use Value: 2 A pulsed I_CM and 180 MHz f_T enable fast MOSFET turn-on with minimal propagation delay and overshoot.

Low-Side Switches

Battery-Driven Devices

Use Scenario: Load switch controlling solenoids, relays, or LED arrays in automotive body electronics and industrial I/O modules.

IC Role / Device Role / Timing Role: High-current NPN switch placed between load and ground, driven by microcontroller GPIO.

Use Value: 80 V V_CEO accommodates 24 V/48 V systems with margin; 1.35 W P_tot supports continuous 1 A loads with passive heatsinking.

Use Scenario: Power path control and battery protection circuitry in handheld medical instruments and portable test equipment.

IC Role / Device Role / Timing Role: Discrete switch managing battery discharge paths, charging enable, or backup supply selection.

Use Value: Wide operating temperature range (-55 °C to +150 °C) ensures reliability in unregulated environments; low leakage (I_CBO ≤ 100 nA) preserves battery life during standby.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCP56,115	Same SOT89 package, identical V_CEO/I_C, but h_FE range 40–250; lower f_T (100 MHz typ)	Suitable for lower-frequency switching where gain consistency at high I_C is prioritized over speed	Select when tighter h_FE tolerance needed at I_C = 500 mA, or when cost sensitivity outweighs f_T requirement
ZTX653	TO-92 package, higher V_CEO (100 V), same I_C (1 A), h_FE 100–800, but no SMT thermal pad	Preferred in through-hole prototyping or legacy designs requiring axial-leaded replacement	Choose only if board layout prohibits SMT or thermal pad integration; avoid in high-density or thermally constrained assemblies

Compared with BCX56,135, BCP56,115 offers comparable thermal performance in SOT89 but reduced high-frequency response, while ZTX653 trades surface-mount compatibility and PCB thermal coupling for wider gain range and higher voltage headroom in through-hole form.

Availability

BCX56,135 is available at Aetrix Electronics and suitable for linear voltage regulators, MOSFET drivers, and low-side switches requiring stable component supply in industrial automation, portable instrumentation, and embedded power management systems.

Supply support for BCX56,135 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 semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-grade and industrial-standard components.

The BCX56 series belongs to Nexperia's medium-power bipolar transistor product line, engineered for robust switching and linear operation in cost-sensitive, thermally demanding applications where SMT thermal performance and parametric consistency are critical.

FAQ

What is the maximum allowable base current for BCX56,135?

The absolute maximum DC base current is 0.3 A, and peak base current is also limited to 0.3 A for pulses ≤1 ms. Exceeding this risks bond wire failure or localized heating. For reliable saturation at I_C = 1 A, typical design uses I_B = 100 mA (h_FE-based drive), well within safe limits.

Can BCX56,135 be used in avalanche mode?

No - BCX56,135 is not rated or characterized for avalanche operation. Its V_CEO = 80 V and V_CBO = 100 V are absolute maximum ratings under specified test conditions; operation beyond V_CEO risks irreversible breakdown. Snubber networks or clamping diodes must be used in inductive switching applications.

How does thermal performance change with PCB copper area?

R_th(j-a) drops from 250 K/W (standard footprint) to 132 K/W (1 cm² collector pad) and 93 K/W (6 cm² pad). A 6 cm² pad reduces junction temperature rise by ~63% versus standard layout at 1 W dissipation, directly extending safe operating area and lifetime in continuous-use applications.

Is BCX56,135 suitable for automotive applications?

No - BCX56,135 is not AEC-Q101 qualified and lacks automotive-specific testing or qualification documentation. It is intended for industrial, consumer, and general-purpose applications. For automotive use, Nexperia's AEC-Q101-qualified alternatives like PBSS4041T or MMBT4401 must be selected instead.

BCX56,135 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 50mA, 500mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 63 @ 150mA, 2V

Power - Max:: 1.25 W

Frequency - Transition:: 180MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

BCX56,135 FAQ

1.How can I place an order for BCX56,135 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCX56,135 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 BCX56,135 reliable?

The price and inventory of BCX56,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX56,135 is usually 5 days.

3.What payment methods are accepted for BCX56,135?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX56,135 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCX56,135?

BCX56,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCX56,135 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 BCX56,135?

For technical support, including BCX56,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX56,135 requirements.

6.How does Aetrix verify that BCX56,135 is sourced from the original manufacturer or authorized distributors?

All BCX56,135 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 BCX56,135 meets industry standards.

7.What is the process for return or replacement of BCX56,135?

All BCX56,135 units undergo pre-shipment inspection (PSI). If there is an issue with BCX56,135, 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 BCX56,135 part is unused and in its original packaging.

Return procedure for BCX56,135:

1.Submit a request within 90 days.

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

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