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

STMicroelectronics BDX53C

Name: BDX53C
Brand: STMicroelectronics
SKU: BDX53C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BDX53C

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BDX53C.pdf

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

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Product details

Overview

BDX53C from STMicroelectronics is an NPN complementary power Darlington transistor in TO-220 package, featuring 100 V V_CEO, 8 A I_C, 60 W P_TOT, integrated antiparallel collector-emitter diode, and monolithic planar construction with base island layout-used in high-current linear audio output stages and industrial switching regulators.

For engineers reviewing the BDX53C datasheet, BDX53C pinout, BDX53C application, or BDX53C equivalent, key selection criteria include sustained V_CEO(sus) = 100 V at I_C = 100 mA, h_FE ≥ 750 at I_C = 3 A, V_CE(sat) ≤ 2 V, integrated clamping diode forward voltage (V_F = 1.8–2.5 V), and thermal resistance R_thJC = 2.08 °C/W for heatsink-coupled thermal design.

Technical Context

The BDX53C implements a monolithic Darlington pair with built-in antiparallel diode across collector and emitter, enabling safe inductive load switching without external flyback protection. Its planar "base island" layout ensures stable h_FE linearity and high f_T frequency performance under high-current bias conditions.

Designed for linear and switching operation up to 150 °C junction temperature, it supports DC and pulsed collector currents up to 8 A continuous and 12 A peak, with V_BE(sat) ≤ 2.5 V at I_C = 3 A and I_B = 12 mA-enabling direct drive from low-voltage logic or op-amp outputs with minimal base drive loss.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	100 V - Sustains 100 V collector-emitter blocking voltage with base open, critical for 48 V industrial bus and audio rail applications.
I_C	8 A - Continuous collector current rating enables use in >50 W Class AB audio output stages and motor driver half-bridges.
P_TOT	60 W at T_C = 25 °C - Defines maximum dissipation with heatsink; requires R_thJC + R_thCS + R_thSA ≤ 2.08 °C/W for safe 150 °C T_J.
h_FE	≥750 at I_C = 3 A, V_CE = 3 V - High DC gain reduces required base drive current, easing interface with microcontrollers or op-amps.
V_F (diode)	1.8–2.5 V at I_F = 3–8 A - Integrated antiparallel diode provides fast, low-loss freewheeling path for inductive loads without external component.
R_thJC	2.08 °C/W - Junction-to-case thermal resistance determines minimum heatsink requirement when mounted with thermal interface material.

Pinout & Package

BDX53C uses TO-220 type A package with metal tab electrically connected to collector (pin 2). The plastic body isolates the tab from mounting hardware unless soldered or bolted directly to heatsink.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input node	Receives base current to enable Darlington conduction; requires current-limiting resistor (R1 ≈ 10 kΩ typical) to prevent saturation delay.
2 (Collector / TAB)	Main current output / thermal path	Electrically tied to metal tab; must be isolated from chassis unless circuit design intentionally bonds collector to ground/heatsink.
3 (Emitter)	Current return path	Serves as common emitter reference; connects to load return or ground; internal diode anode ties to this terminal.

Key Features

Feature	Design Value
Monolithic Darlington configuration	Single-die integration of driver and output transistors ensures matched thermal tracking, eliminates inter-device wiring inductance, and guarantees consistent h_FE linearity.
Integrated antiparallel collector-emitter diode	Eliminates need for external flyback diode in relay drivers and solenoid controls-reducing BOM count and PCB area while improving turn-off speed.
Base island planar layout	Optimizes current distribution and thermal uniformity across emitter stripes, enabling stable h_FE over full I_C range and improved safe operating area (SOA).
High f_T frequency	Supports switching operation beyond 100 kHz in PWM-based industrial converters, reducing switching losses compared to discrete Darlington implementations.

Applications

Audio Power Amplifiers

Industrial Relay Drivers

Use Scenario: Output stage in 30–60 W Class AB audio amplifiers driving 4–8 Ω speakers.

IC Role / Device Role / Timing Role: NPN Darlington switch delivering high-current, low-distortion analog output with minimal crossover distortion.

Use Value: h_FE ≥ 750 ensures low base drive burden; V_CE(sat) ≤ 2 V minimizes quiescent power loss and improves thermal efficiency.

Use Scenario: Driving 24 V DC industrial relays (100–500 mA coil) in PLC output modules.

IC Role / Device Role / Timing Role: High-gain switching transistor with integrated flyback diode for inductive load commutation.

Use Value: Built-in antiparallel diode clamps inductive kickback at ≤2.5 V, eliminating external diode and reducing board space by 30%.

Linear Voltage Regulators

DC Motor Half-Bridge Stages

Use Scenario: Pass element in adjustable 5–30 V, 3–5 A linear regulators for test equipment power supplies.

IC Role / Device Role / Timing Role: Series pass transistor dissipating up to 60 W with controlled thermal rise via TO-220 heatsink interface.

Use Value: R_thJC = 2.08 °C/W enables stable operation at T_J ≤ 150 °C with standard 10 °C/W heatsink and thermal paste.

Use Scenario: High-side switch in 24 V brushed DC motor control (≤5 A stall current) for factory automation actuators.

IC Role / Device Role / Timing Role: Current-sourcing Darlington output stage with fast turn-off enabled by integrated diode recovery.

Use Value: V_CEO(sus) = 100 V withstands motor back-EMF spikes during abrupt stop; f_T supports PWM frequencies up to 120 kHz.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TIP142	V_CEO = 100 V, I_C = 10 A, no integrated diode, h_FE min = 1000	Requires external flyback diode for inductive loads; higher h_FE eases base drive but increases susceptibility to secondary breakdown.	Select when higher DC gain and higher current rating are prioritized over integrated protection.
MJ15003	V_CEO = 120 V, I_C = 20 A, no integrated diode, TO-3 package, R_thJC = 1.5 °C/W	Larger footprint and higher cost; superior SOA and thermal performance but lacks on-chip diode and requires separate mounting hardware.	Select for ultra-high-reliability linear amplifier designs where SOA margin and thermal headroom outweigh integration benefits.

Compared with TIP142 and MJ15003, BDX53C offers unique value in space-constrained industrial controls where integrated diode simplifies layout and TO-220 form factor enables standardized heatsink compatibility-without sacrificing V_CEO or thermal capability.

Availability

BDX53C is available at Aetrix Electronics and suitable for audio power amplifiers, industrial relay drivers, linear voltage regulators, and DC motor half-bridge stages requiring stable component supply and long-term production continuity.

Supply support for BDX53C 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs and discrete power devices for automotive, industrial, and consumer markets.

BDX53C belongs to ST's high-voltage, high-current power transistor product line-engineered specifically for robust linear and switching operation in harsh industrial environments with extended temperature and reliability requirements.

FAQ

Is BDX53C pin-compatible with BDX53B?

Yes, BDX53C is pin-compatible with BDX53B and shares identical TO-220 package outline and pin assignment (Base–Collector–Emitter). The only difference is absolute maximum ratings: BDX53C has higher V_CEO (100 V vs. 80 V) and V_CB0 (100 V vs. 80 V), making it a direct upgrade in new designs where higher voltage margin is needed.

Can BDX53C replace a standard bipolar transistor like 2N3055 in audio output stages?

Yes, but with design adjustments: BDX53C's Darlington structure gives ~10× higher h_FE than 2N3055, reducing base drive current significantly-but also adds ~1.4 V extra V_BE(sat) due to two series base-emitter junctions. Compensation for increased V_BE and verification of SOA under transient loads are required.

What is the role of the integrated antiparallel diode in BDX53C?

The integrated diode connects cathode to collector and anode to emitter, providing a low-impedance path for reverse current during inductive load turn-off. It clamps flyback voltage to ≤2.5 V at 8 A, eliminating external diode placement and reducing parasitic inductance-critical for reliable relay and solenoid switching in industrial PLCs.

Does BDX53C require a heatsink in all applications?

Yes-any application drawing >1 W continuous power dissipation requires a heatsink. At 3 A I_C and 2 V V_CE(sat), power dissipation exceeds 6 W; with R_thJC = 2.08 °C/W and ambient >40 °C, junction temperature will exceed 150 °C without thermal management. TO-220 tab must be mechanically and thermally coupled to heatsink using thermal compound and insulated washer if electrical isolation is needed.

BDX53C Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

Transistor Type:: NPN - 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:: 60 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

BDX53C FAQ

1.How can I place an order for BDX53C through Aetrix?

Please submit a Request for Quotation (RFQ) for BDX53C 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 BDX53C reliable?

The price and inventory of BDX53C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDX53C is usually 5 days.

3.What payment methods are accepted for BDX53C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDX53C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BDX53C?

BDX53C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BDX53C 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 BDX53C?

For technical support, including BDX53C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDX53C requirements.

6.How does Aetrix verify that BDX53C is sourced from the original manufacturer or authorized distributors?

All BDX53C 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 BDX53C meets industry standards.

7.What is the process for return or replacement of BDX53C?

All BDX53C units undergo pre-shipment inspection (PSI). If there is an issue with BDX53C, 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 BDX53C part is unused and in its original packaging.

Return procedure for BDX53C:

1.Submit a request within 90 days.

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

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