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onsemi BDX53ATU
- Part No.:
- BDX53ATU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BDX53ATU.pdf
- Description:
- TRANS NPN DARL 60V 8A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,522
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Product details
Overview
BDX53ATU from ON Semiconductor (formerly Fairchild) is an NPN epitaxial silicon Darlington transistor in TO-220 package, rated for 60 V VCEO, 8 A DC collector current, and 60 W power dissipation at TC = 25°C; used in audio amplifier output stages and hammer driver circuits requiring high-current gain and integrated damper diode.
For engineers reviewing the BDX53ATU datasheet, pinout, applications, or equivalent options, key selection criteria include VCEO = 60 V, hFE ≥ 750 at IC = 3 A, VCE(sat) ≤ 2 V, integrated parallel diode (VF = 1.8 V @ 3 A), and TO-220 thermal performance with case temperature derating.
Technical Context
The BDX53ATU implements a monolithic Darlington pair with built-in emitter-base clamp and integrated damper diode across C–E, enabling robust switching and linear operation without external flyback protection. It operates with base-emitter saturation voltage of 2.5 V and collector-emitter sustaining voltage of 60 V under pulsed conditions.
Designed for medium-power linear and switching applications, it supports DC and pulse collector currents up to 8 A and 12 A respectively, with junction temperature limited to 150°C and storage range from –65°C to +150°C; thermal resistance θJC is optimized for TO-220 mounting on heatsinks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum continuous collector-emitter voltage before breakdown; defines safe operating voltage headroom in amplifier or switch designs. |
| IC (DC) | 8 A - Continuous collector current capability; determines maximum sustained load drive without thermal runaway. |
| hFE | ≥750 @ VCE = 3 V, IC = 3 A - High DC current gain reduces required base drive current in power stage designs. |
| VCE(sat) | ≤2 V @ IC = 3 A, IB = 12 mA - Low saturation voltage minimizes conduction loss and heat generation in switching applications. |
| VF (diode) | 1.8 V @ IF = 3 A - Forward voltage of integrated damper diode; enables self-contained inductive load handling without external snubber. |
| PC | 60 W @ TC = 25°C - Maximum dissipated power at case temperature; requires heatsink design per derating curve above 25°C. |
Pinout & Package
BDX53ATU is housed in a standard TO-220 package with vertical mounting orientation, metal tab electrically connected to collector, and thermally optimized for heatsink attachment via screw or clip. Pin assignment is fixed: Pin 1 = Base, Pin 2 = Collector (tab), Pin 3 = Emitter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Base | Control input terminal; accepts low-current drive to enable high-gain amplification or switching of collector current. |
| Pin 2 | Collector (Tab) | Main power output terminal and thermal interface; electrically tied to metal tab for direct heatsink coupling and current return path. |
| Pin 3 | Emitter | Common reference terminal for output stage; connects to ground or load return in common-emitter configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic Darlington structure | Integrates driver and output transistors on single die, delivering hFE ≥ 750 while maintaining matched thermal behavior and reduced layout complexity. |
| Integrated damper diode | Anti-parallel diode between collector and emitter enables safe commutation of inductive loads (e.g., solenoids, relays) without external components. |
| TO-220 mechanical standardization | Enables drop-in replacement in legacy designs using industry-standard footprint, mounting hole pattern, and heatsink interface dimensions. |
| VCEO(sus) = 60 V | Guaranteed sustaining voltage under transient overvoltage conditions ensures reliable operation in unregulated or noisy supply environments. |
Applications
| Audio Amplifier Output Stage | Hammer Driver Circuit |
|---|---|
Use Scenario: Final push-pull output stage in Class AB audio amplifiers driving 4–8 Ω speakers. IC Role / Device Role / Timing Role: NPN Darlington power transistor delivering high-current, low-distortion analog output with integrated diode for speaker protection. Use Value: High hFE reduces driver-stage loading; VCE(sat) ≤ 2 V minimizes idle heat and improves efficiency at full output swing. | Use Scenario: Driving electromagnetic hammers in industrial stamping, sorting, or valve actuation systems. IC Role / Device Role / Timing Role: Switching element controlling high-current pulses to inductive hammer coils with integrated flyback path. Use Value: Built-in damper diode eliminates need for external fast-recovery diode; 12 A pulsed rating supports short-duration peak force delivery. |
| DC Motor Control (Unidirectional) | Power Linear Regulator Pass Element |
Use Scenario: Single-direction H-bridge half-bridge or high-side switch for brushed DC motors up to 60 V and 8 A. IC Role / Device Role / Timing Role: High-current switching transistor with thermal stability for PWM-controlled motor speed regulation. Use Value: TO-220 thermal mass and 60 W dissipation support intermittent duty cycles; VCEO = 60 V accommodates back-EMF spikes. | Use Scenario: Series pass element in adjustable linear voltage regulators supplying stable DC to sensitive analog circuitry. IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by dissipating excess input-output differential voltage. Use Value: Low VCE(sat) extends dropout margin; high hFE eases error-amplifier drive requirements and improves regulation accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD127G | VCEO = 100 V, IC = 8 A, hFE = 1000–4000, TO-263 package, no integrated diode | Higher voltage rating but requires external flyback diode; surface-mount only | Select when higher VCEO margin or SMT assembly is required; verify diode placement and thermal pad layout. |
| BDX53C | VCEO = 100 V, same TO-220 package and pinout, identical hFE/VCE(sat) specs | Direct upgrade path for designs needing extended voltage headroom without layout change | Choose BDX53C if system supply or transients exceed 60 V; otherwise BDX53ATU offers optimal cost/performance balance at 60 V. |
Compared with MJD127G and BDX53C, the BDX53ATU provides integrated diode protection and through-hole compatibility at 60 V rating-making it ideal for cost-sensitive, serviceable, or legacy-replacement audio and industrial control designs where external diodes add cost or board space.
Availability
BDX53ATU is available at Aetrix Electronics and suitable for audio amplifier output stages, hammer driver circuits, and unidirectional DC motor control requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for BDX53ATU 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
ON Semiconductor (acquired Fairchild Semiconductor in 2016) is a global semiconductor supplier focused on energy-efficient electronics for automotive, industrial, cloud computing, and IoT applications.
The BDX53ATU belongs to Fairchild's legacy BDX53/A/B/C Darlington transistor family, designed specifically for medium-power linear and switching applications where high current gain, integrated protection, and TO-220 thermal reliability are essential.
FAQ
What is the maximum continuous collector current rating for BDX53ATU?
The BDX53ATU has a maximum continuous collector current (IC) rating of 8 A at case temperature TC = 25°C. This rating decreases with rising case temperature per the published derating curve; at TC = 100°C, the usable IC drops to approximately 4.5 A. The BDX53ATU must be mounted on an appropriately sized heatsink to maintain safe junction temperature during sustained operation.
Does BDX53ATU include an integrated diode, and what is its forward voltage?
Yes, the BDX53ATU integrates a damper diode in anti-parallel across collector and emitter. Its forward voltage is 1.8 V at IF = 3 A and 2.5 V at IF = 8 A. This diode provides inherent flyback protection for inductive loads, eliminating the need for an external fast-recovery diode in hammer drivers or relay interfaces-reducing BOM count and PCB area.
Is BDX53ATU pin-compatible with other variants in the BDX53 family?
Yes, all BDX53 variants-including BDX53, BDX53A, BDX53B, and BDX53C-share identical TO-220 package, pinout (Base–Collector–Emitter), and mechanical dimensions. The BDX53ATU differs only in its 60 V VCEO rating; substituting BDX53C (100 V) requires no PCB changes but may incur higher cost where 60 V suffices.
What is the DC current gain (hFE) specification for BDX53ATU?
The BDX53ATU guarantees a minimum DC current gain (hFE) of 750 when measured at VCE = 3 V and IC = 3 A. This high gain significantly reduces required base drive current-enabling direct interfacing with logic-level controllers or low-power op-amps without additional driver stages in audio or switching applications.
Can BDX53ATU be used in linear regulator applications?
Yes, the BDX53ATU is suitable as a series pass element in linear voltage regulators due to its low VCE(sat) (≤2 V), high hFE, and 60 W power dissipation capability. Its thermal performance in TO-220 allows stable operation under moderate dropout and load conditions; however, careful heatsink sizing is required to limit junction temperature below 150°C during worst-case power dissipation.
BDX53ATU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN - Darlington
- Current - Collector (Ic) (Max):
- 8 A
- Voltage - Collector Emitter Breakdown (Max):
- 60 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-220-3
BDX53ATU FAQ
1.How can I place an order for BDX53ATU through Aetrix?
Please submit a Request for Quotation (RFQ) for BDX53ATU 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 BDX53ATU reliable?
The price and inventory of BDX53ATU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDX53ATU is usually 5 days.
3.What payment methods are accepted for BDX53ATU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDX53ATU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BDX53ATU?
BDX53ATU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BDX53ATU 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 BDX53ATU?
For technical support, including BDX53ATU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDX53ATU requirements.
6.How does Aetrix verify that BDX53ATU is sourced from the original manufacturer or authorized distributors?
All BDX53ATU 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 BDX53ATU meets industry standards.
7.What is the process for return or replacement of BDX53ATU?
All BDX53ATU units undergo pre-shipment inspection (PSI). If there is an issue with BDX53ATU, 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 BDX53ATU part is unused and in its original packaging.
Return procedure for BDX53ATU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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