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

STMicroelectronics BDX53BFP

Name: BDX53BFP
Brand: STMicroelectronics
SKU: BDX53BFP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BDX53BFP

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: BDX53BFP.pdf

Description:: TRANS NPN DARL 80V 8A TO-220FP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,088

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

Product details

Overview

BDX53BFP from STMicroelectronics is an NPN silicon power Darlington transistor in a fully insulated TO-220FP package, rated for 80 V V_CEO, 8 A I_C, and 29 W P_tot at T_c ≤ 25 °C, designed for medium-power linear and switching applications including hammer drivers and audio amplifiers.

For engineers reviewing the BDX53BFP datasheet, BDX53BFP pinout, BDX53BFP application, or BDX53BFP equivalent, key selection considerations include its integrated base-emitter resistors (R1 = 10 kΩ, R2 = 150 Ω), 1500 V RMS insulation rating, and Darlington-specific saturation characteristics (V_CE(sat) = 2 V @ 3 A).

Technical Context

The BDX53BFP integrates two NPN transistors in monolithic Darlington configuration with built-in base biasing resistors-R1 (10 kΩ) between base and emitter, and R2 (150 Ω) between base and collector-enabling simplified gate drive and eliminating external bias components. It operates as a high-gain, medium-current switch or linear amplifier with guaranteed h_FE ≥ 750 at I_C = 3 A.

Its TO-220FP package provides full electrical isolation between all three leads and the heatsink (1500 V RMS), supporting safe mounting without insulating washers. Thermal resistance is 4.3 °C/W junction-to-case, enabling efficient heat transfer in industrial linear and switching equipment.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum sustainable collector-emitter voltage with base open; defines safe operating voltage ceiling in switching applications.
I_C	8 A - Continuous DC collector current rating; supports medium-power loads such as solenoid drivers and audio output stages.
P_tot	29 W at T_c ≤ 25 °C - Total power dissipation limit; requires heatsinking above ambient to maintain junction temperature ≤ 150 °C.
h_FE	≥750 @ I_C = 3 A, V_CE = 3 V - High DC current gain reduces required base drive current, simplifying driver circuit design.
V_CE(sat)	2 V @ I_C = 3 A, I_B = 12 mA - Saturation voltage determines conduction loss and thermal load during on-state operation.
R_th(j-case)	4.3 °C/W - Junction-to-case thermal resistance; enables calculation of case temperature rise under known power dissipation.

Pinout & Package

BDX53BFP uses a TO-220FP (fully molded, isolated) package with three leads: emitter (pin 1), base (pin 2), collector (pin 3). The package provides 1500 V RMS insulation between all leads and the heatsink mounting surface.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Emitter)	Emitter terminal of Darlington pair	Low-impedance output node; connects to ground or load return path in common-emitter configurations.
Pin 2 (Base)	Input control terminal with internal bias resistors	Accepts TTL/CMOS-compatible logic-level drive due to integrated R1 (10 kΩ) and R2 (150 Ω); no external base resistor needed.
Pin 3 (Collector)	High-current output terminal	Connects to positive supply or load high-side; carries full load current with minimal saturation loss.

Key Features

Feature	Design Value
Integrated bias network	On-chip R1 = 10 kΩ (base–emitter) and R2 = 150 Ω (base–collector) eliminate external base resistors and simplify PCB layout.
Full electrical isolation	1500 V RMS insulation between all three leads and heatsink enables direct mounting without mica washers or insulators.
Darlington configuration	Monolithic NPN–NPN pair delivers h_FE ≥ 750, reducing required base drive current by >10× vs. single transistor.
Robust SOA	Guaranteed safe operating area up to 80 V / 8 A with pulse capability; suitable for inductive load switching with snubbers.

Applications

Hammer Drivers

Audio Amplifier Output Stage

Use Scenario: Driving electromagnetic solenoids in industrial riveting or nail-driving tools requiring high peak current pulses.

IC Role / Device Role / Timing Role: Medium-power NPN Darlington switch controlling solenoid coil current with fast turn-on/turn-off via logic-level base input.

Use Value: Integrated base resistors enable direct microcontroller GPIO drive; 8 A rating supports >100 W mechanical impulse delivery.

Use Scenario: Class-AB output stage in 10–20 W audio amplifiers for public address or instrumentation systems.

IC Role / Device Role / Timing Role: Linear amplifier delivering low-distortion, high-current output to 4–8 Ω speaker loads.

Use Value: Low V_CE(sat) (2 V) minimizes quiescent heating; h_FE ≥ 750 ensures stable bias under varying thermal conditions.

Industrial Power Supplies

DC Motor Control (Small Actuators)

Use Scenario: Pass transistor in linear regulated power supplies delivering up to 5 A at 24 V for PLC I/O modules.

IC Role / Device Role / Timing Role: Series pass element regulating output voltage under variable load and line conditions.

Use Value: 29 W power dissipation capacity and 4.3 °C/W R_th(j-case) support continuous operation with moderate heatsinking.

Use Scenario: H-bridge half-bridge switch for bidirectional control of 12–24 V DC motors in valve actuators or robotic joints.

IC Role / Device Role / Timing Role: High-current switching element handling stall currents up to 8 A during motor startup or jamming.

Use Value: 80 V V_CEO margin accommodates back-EMF spikes; TO-220FP isolation prevents ground loop issues in multi-motor systems.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BDX53C	V_CEO = 100 V, same package but non-isolated TO-220; no 1500 V insulation rating.	Requires external insulator for heatsink mounting; unsuitable where creepage/clearance mandates isolation.	Select when higher voltage margin is needed and isolation is handled externally.
TIP122	Same Darlington topology but TO-220 non-isolated; h_FE min = 1000, V_CE(sat) = 2.5 V @ 3 A, lower P_tot = 65 W (case-limited).	Lacks integrated base resistors; requires external R_B; not U.L.-compliant for isolated mounting.	Choose for higher gain and lower cost where board space allows discrete biasing and isolation is not required.

Compared with BDX53C and TIP122, the BDX53BFP uniquely combines U.L.-compliant isolation, integrated biasing, and 80 V/8 A ratings-making it optimal for safety-critical industrial switching where simplified assembly and regulatory compliance are mandatory.

Availability

BDX53BFP is available at Aetrix Electronics and suitable for hammer drivers, audio amplifiers, and industrial linear power supplies requiring stable component supply and long-term manufacturability.

Supply support for BDX53BFP 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, designing and manufacturing analog, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The BDX53BFP belongs to ST's legacy power bipolar transistor family, engineered specifically for robust, medium-power linear and switching applications in harsh industrial environments where reliability and ease of mounting are critical.

FAQ

What is the purpose of the internal resistors R1 and R2 in the BDX53BFP?

R1 (10 kΩ) connects base to emitter, and R2 (150 Ω) connects base to collector. They provide automatic biasing, allowing direct logic-level drive without external resistors. This reduces component count and improves reliability in high-vibration industrial settings.

Can the BDX53BFP be used without a heatsink?

No. With a maximum P_tot of 29 W and R_th(j-case) = 4.3 °C/W, even modest power dissipation (e.g., 5 W) raises junction temperature significantly above ambient. A properly sized heatsink is mandatory for continuous operation.

Is the BDX53BFP RoHS compliant?

Yes. As documented in STMicroelectronics' official product change notices and packaging data sheets, BDX53BFP is manufactured in accordance with RoHS Directive 2011/65/EU and is lead-free with halogen-free molding compound.

How does the TO-220FP package differ from standard TO-220 in practical mounting?

TO-220FP features fully molded insulation over the entire back surface and leads, enabling direct bolt-down to a conductive heatsink without mica washers or silicone pads. This eliminates thermal interface resistance from insulators and simplifies mechanical assembly per UL 60950-1 requirements.

BDX53BFP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3 Full Pack

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN - Darlington

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

Voltage - Collector Emitter Breakdown (Max):: 80 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:: 29 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FP

BDX53BFP FAQ

1.How can I place an order for BDX53BFP through Aetrix?

Please submit a Request for Quotation (RFQ) for BDX53BFP 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 BDX53BFP reliable?

The price and inventory of BDX53BFP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDX53BFP is usually 5 days.

3.What payment methods are accepted for BDX53BFP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDX53BFP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BDX53BFP?

BDX53BFP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BDX53BFP 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 BDX53BFP?

For technical support, including BDX53BFP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDX53BFP requirements.

6.How does Aetrix verify that BDX53BFP is sourced from the original manufacturer or authorized distributors?

All BDX53BFP 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 BDX53BFP meets industry standards.

7.What is the process for return or replacement of BDX53BFP?

All BDX53BFP units undergo pre-shipment inspection (PSI). If there is an issue with BDX53BFP, 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 BDX53BFP part is unused and in its original packaging.

Return procedure for BDX53BFP:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 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…

2026-09-02 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…