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

onsemi BDX54C

Name: BDX54C
Brand: onsemi
SKU: BDX54C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BDX54C

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BDX54C.pdf

Description:: TRANS PNP DARL 100V 8A TO-220

Quantity:: RFQ Add To RFQ list

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Inventory:5,195

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Product details

Overview

BDX54C from onsemi is a PNP silicon Darlington power transistor in TO-220 package, rated for 100 V_CEO(sus), 8.0 A continuous collector current, and 65 W total dissipation at T_C = 25°C. It features built-in base-emitter shunt resistors, h_FE = 750 (min) at I_C = 3.0 A, and V_CE(sat) ≤ 2.0 V (max) under same conditions - used in medium-power linear amplifiers and low-speed switching circuits such as motor drivers and relay controls.

For engineers reviewing the BDX54C datasheet, pinout, applications, or equivalent options, key selection considerations include its 100 V sustaining voltage rating, Darlington topology with integrated base resistors, thermal resistance of 1.92°C/W (junction-to-case), and compatibility with TO-220 heatsink mounting in industrial control and power supply output stages.

Technical Context

The BDX54C is a monolithic PNP Darlington transistor with two cascaded PNP stages and internal base-emitter shunt resistors to ensure reliable turn-off. Its structure supports high DC current gain while maintaining stable operation up to +150°C junction temperature.

It operates in linear and switching modes with V_CEO(sus) = 100 V (min), I_C = 8.0 A continuous, and safe operating area limited by both thermal constraints (R_JC = 1.92°C/W) and second breakdown. The device is Pb-free and RoHS compliant.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO(sus)	100 V min - sustains 100 V between collector and emitter at I_C = 100 mA with base open; defines maximum usable voltage in switching applications.
I_C (continuous)	8.0 A - maximum steady-state collector current without exceeding thermal limits at T_C = 25°C.
P_D @ T_C = 25°C	65 W - total power dissipation capability when case temperature is maintained at 25°C via heatsinking.
h_FE	750 min @ I_C = 3.0 A, V_CE = 3.0 V - ensures low base drive current requirement in amplifier or switch configurations.
V_CE(sat)	2.0 V max @ I_C = 3.0 A, I_B = 12 mA - determines conduction loss and heat generation during saturation.
R_JC	1.92 °C/W - quantifies thermal path efficiency from junction to case; critical for heatsink sizing in power designs.
f_T	Not specified - device not characterized for RF or high-frequency switching; intended for low-speed (<1 MHz) operation.

Pinout & Package

BDX54C uses the TO-220-3 (Case 221A, Style 1) package with 4 terminals: pins 1–4 arranged vertically. Pin 1 is Base, pins 2 and 4 are Collector (dual-collector configuration), and pin 3 is Emitter. The metal tab is electrically connected to the collector and must be isolated from chassis unless referenced to collector potential.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Base	Control input node; requires current-limited drive due to Darlington architecture; internal shunt resistor aids turn-off.
Pin 2	Collector	Main high-current output terminal; electrically tied to metal tab; used for primary collector connection in PCB layout.
Pin 3	Emitter	Power return path; common reference for load; polarity reversed vs. NPN counterparts (e.g., BDX53C).
Pin 4	Collector	Secondary collector terminal; redundant connection for improved current sharing and thermal distribution in high-current traces.

Key Features

Feature	Design Value
Monolithic Darlington structure	Integrates driver and output transistors on one die, enabling high h_FE > 750 without external bias networks.
Built-in base-emitter shunt resistors	Ensures reliable turn-off without external pull-down; eliminates risk of latch-up in inductive load switching.
100 V collector-emitter sustaining voltage	Supports operation in 72–96 VDC industrial bus systems and legacy telecom power rails without derating.
TO-220 package with dual collector pins	Enables robust PCB trace routing and thermal coupling to heatsinks; dual collectors reduce current density per bond wire.
Pb-free and RoHS compliant	Meets global environmental compliance requirements for industrial and consumer equipment manufacturing.

Applications

DC Motor Control	Linear Power Supply Regulator
Use Scenario: Controlling bidirectional 24–48 V brushed DC motors in industrial actuators and HVAC dampers. IC Role / Device Role / Timing Role: PNP Darlington switch providing high-current sinking path for motor winding commutation. Use Value: 8.0 A continuous rating and 100 V_CEO(sus) allow direct interface with back-EMF spikes up to 80 V without snubbers.	Use Scenario: Pass element in adjustable linear regulators delivering up to 5 A at 5–30 V output. IC Role / Device Role / Timing Role: Series pass transistor regulating output voltage under feedback control from error amplifier. Use Value: Low V_CE(sat) (≤2.0 V) minimizes dropout and heat generation at full load, reducing heatsink size.
Relay Driver Circuit	High-Voltage Lamp Dimmer
Use Scenario: Driving 12–24 VDC electromagnetic relays with coil currents up to 6 A in PLC I/O modules. IC Role / Device Role / Timing Role: High-gain switch interfacing microcontroller GPIO to inductive relay load. Use Value: Integrated base shunt resistor prevents false turn-on from leakage or noise, improving system reliability.	Use Scenario: Phase-controlled dimming of 100–240 VAC incandescent lamps using TRIAC-triggered zero-crossing circuitry. IC Role / Device Role / Timing Role: DC-level shift and amplification stage driving TRIAC gate from low-voltage controller. Use Value: 100 V rating allows safe operation in rectified AC line applications where peak voltages reach ~170 VDC.

DC Motor Control

Linear Power Supply Regulator

Use Scenario: Controlling bidirectional 24–48 V brushed DC motors in industrial actuators and HVAC dampers.

IC Role / Device Role / Timing Role: PNP Darlington switch providing high-current sinking path for motor winding commutation.

Use Value: 8.0 A continuous rating and 100 V_CEO(sus) allow direct interface with back-EMF spikes up to 80 V without snubbers.

Use Scenario: Pass element in adjustable linear regulators delivering up to 5 A at 5–30 V output.

IC Role / Device Role / Timing Role: Series pass transistor regulating output voltage under feedback control from error amplifier.

Use Value: Low V_CE(sat) (≤2.0 V) minimizes dropout and heat generation at full load, reducing heatsink size.

Relay Driver Circuit

High-Voltage Lamp Dimmer

Use Scenario: Driving 12–24 VDC electromagnetic relays with coil currents up to 6 A in PLC I/O modules.

IC Role / Device Role / Timing Role: High-gain switch interfacing microcontroller GPIO to inductive relay load.

Use Value: Integrated base shunt resistor prevents false turn-on from leakage or noise, improving system reliability.

Use Scenario: Phase-controlled dimming of 100–240 VAC incandescent lamps using TRIAC-triggered zero-crossing circuitry.

IC Role / Device Role / Timing Role: DC-level shift and amplification stage driving TRIAC gate from low-voltage controller.

Use Value: 100 V rating allows safe operation in rectified AC line applications where peak voltages reach ~170 VDC.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP Darlington power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD44H11T4G	TO-252 (DPAK), 80 V_CEO, 8 A, h_FE = 1000–4000 (typ), no internal shunt resistors.	Suitable for surface-mount designs; requires external base pull-down for reliable turn-off.	Select when board space is constrained and SMT assembly is preferred; verify external turn-off network design.
BDX54B	Same TO-220 package but rated for 80 V_CEO(sus); otherwise identical pinout, gain, and saturation characteristics.	Used where 80 V system margin is sufficient and cost optimization is prioritized over 100 V headroom.	Drop-in replacement only if V_CE stress remains below 80 V; not recommended for 96 V bus or high-back-EMF loads.

Compared with MJD44H11T4G and BDX54B, the BDX54C offers higher voltage margin (100 V vs. 80 V), built-in turn-off assurance, and through-hole mechanical robustness - making it preferable for industrial mains-referenced or high-reliability wired-control applications.

Availability

BDX54C is available at Aetrix Electronics and suitable for industrial motor control, linear power regulation, and relay interface applications requiring stable component supply across extended production lifecycles.

Supply support for BDX54C 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

onsemi is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT markets.

The BDX54C belongs to onsemi's plastic medium-power complementary silicon transistor family, designed specifically for general-purpose amplifier and low-speed switching applications where high DC gain and rugged packaging are essential.

FAQ

What is the maximum continuous collector current rating for the BDX54C?

The BDX54C is rated for 8.0 A continuous collector current (I_C) at case temperature T_C = 25°C. This rating assumes adequate heatsinking; derating applies above 25°C at 0.48 W/°C. At elevated temperatures or with limited thermal management, the usable current must be reduced per the power derating curve in Figure 1 of the datasheet.

Does the BDX54C have built-in base-emitter resistors, and why does that matter?

Yes, the BDX54C includes monolithically integrated base-emitter shunt resistors. This feature ensures reliable turn-off by discharging stored base charge without requiring an external pull-down resistor - critical for driving inductive loads like relays or motors where unintended conduction could cause failure or safety hazards.

Can the BDX54C be used as a direct replacement for the BDX54B?

The BDX54C shares identical pinout, package, and gain/saturation characteristics with the BDX54B, differing only in its higher 100 V_CEO(sus) rating versus 80 V for the BDX54B. It can replace BDX54B in any design where the 20 V extra margin is beneficial, but BDX54B is not a guaranteed drop-in substitute for BDX54C in 90–100 V applications due to lower voltage rating.

What is the thermal resistance from junction to case (R_JC) for the BDX54C?

The BDX54C has a thermal resistance of R_JC = 1.92°C/W, measured from junction to case under standard test conditions. This value is essential for calculating required heatsink thermal resistance (R_SA) using the formula: R_SA ≤ (T_J(max) − T_A) / P_D − R_JC − R_CS, where T_J(max) = 150°C and R_CS is interface material resistance.

Is the BDX54C suitable for high-frequency switching applications?

No, the BDX54C is not characterized for high-frequency operation. Its small-signal current gain (h_fe) is specified only at 1.0 MHz, and no f_T or switching time data is provided beyond low-speed metrics (t_d, t_r, t_s, t_f). It is explicitly intended for low-speed switching and linear amplifier use, not PWM or RF applications.

BDX54C Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP - Darlington

Current - Collector (Ic) (Max):: 8 A

Voltage - Collector Emitter Breakdown (Max):: 100 V

Vce Saturation (Max) @ Ib, Ic:: 2V @ 12mA, 3A

Current - Collector Cutoff (Max):: 500µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 750 @ 3A, 3V

Power - Max:: 65 W

Frequency - Transition:: -

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

BDX54C FAQ

1.How can I place an order for BDX54C through Aetrix?

Please submit a Request for Quotation (RFQ) for BDX54C 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 BDX54C reliable?

The price and inventory of BDX54C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDX54C is usually 5 days.

3.What payment methods are accepted for BDX54C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDX54C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BDX54C?

BDX54C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BDX54C 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 BDX54C?

For technical support, including BDX54C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDX54C requirements.

6.How does Aetrix verify that BDX54C is sourced from the original manufacturer or authorized distributors?

All BDX54C 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 BDX54C meets industry standards.

7.What is the process for return or replacement of BDX54C?

All BDX54C units undergo pre-shipment inspection (PSI). If there is an issue with BDX54C, 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 BDX54C part is unused and in its original packaging.

Return procedure for BDX54C:

1.Submit a request within 90 days.

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

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