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onsemi BDX53CTU
- Part No.:
- BDX53CTU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BDX53CTU.pdf
- Description:
- TRANS NPN DARL 100V 8A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:60
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Product details
Overview
BDX53CTU from onsemi is an NPN Darlington power transistor in TO-220 package, designed for medium-power linear amplification and low-speed switching. It delivers 8.0 A continuous collector current, sustains 100 Vdc collector-emitter voltage (VCEO(sus)), and exhibits typical DC current gain (hFE) of 750 at IC = 3.0 A - used in motor control drivers and relay interface circuits.
For engineers reviewing the BDX53CTU datasheet, pinout, applications, or equivalent options, key selection criteria include its built-in base-emitter shunt resistors, 65 W total device dissipation at TC = 25°C, thermal resistance RJC = 1.92 °C/W, and RoHS-compliant Pb-free construction.
Technical Context
The BDX53CTU is a monolithic silicon Darlington pair with integrated base-emitter shunt resistors, enabling simplified biasing and improved turn-off speed versus standard bipolar transistors. Its architecture supports stable DC amplification and robust switching up to ~1 MHz small-signal bandwidth (hfe ≥ 4.0 at f = 1.0 MHz).
It operates across −65°C to +150°C junction temperature range and features VCE(sat) ≤ 2.0 Vdc at IC = 3.0 Adc/IB = 12 mAdc, VBE(sat) ≤ 2.5 Vdc under same conditions, and Cob = 300 pF at VCB = 10 Vdc - confirming suitability for audio output stages and industrial load switching where low saturation loss and predictable capacitance matter.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO(sus) | 100 Vdc minimum - enables use in 80 V rail systems with margin against transient overvoltage. |
| IC (continuous) | 8.0 Adc - supports driving solenoids, fans, or small DC motors without external heat sinking below 25°C case temp. |
| hFE | 750 min @ IC = 3.0 A, VCE = 3.0 V - reduces required base drive current by >10× vs. single bipolar transistor. |
| VCE(sat) | 2.0 Vdc max @ IC = 3.0 A, IB = 12 mA - limits conduction loss to ≤6 W at 3 A, easing thermal design. |
| RJC | 1.92 °C/W - allows precise junction temperature estimation during pulsed operation using transient thermal curves. |
| Cob | 300 pF @ VCB = 10 V - defines high-frequency roll-off and Miller effect in amplifier feedback networks. |
| PD | 65 W @ TC = 25°C - sets absolute maximum steady-state power handling before derating applies. |
Pinout & Package
BDX53CTU is housed in a TO-220 package (Case 221A, Style 1), with metal tab electrically connected to collector and thermally coupled to heatsink. The plastic body provides electrical isolation while enabling mechanical mounting via the tab screw hole.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input node | Receives base current to enable Darlington conduction; internal shunt resistor aids turn-off. |
| 2 (Collector) | Main current sink path | Connected to metal tab - must be isolated from heatsink unless circuit ground reference permits. |
| 3 (Emitter) | Main current source path | Provides low-impedance return path; voltage drop here affects load-side referencing. |
| 4 (Collector) | Redundant collector terminal | Parallel connection point to Pin 2 - improves current sharing and thermal distribution in high-current layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic Darlington structure | Integrates driver and output transistors on one die - eliminates interconnect parasitics and ensures matched thermal behavior. |
| Built-in base-emitter shunt resistor | Enables reliable turn-off without external pull-down; critical for interfacing with open-collector logic or microcontroller GPIO. |
| High VCEO(sus) rating | 100 Vdc minimum - supports operation in 48 V industrial buses and automotive 24 V systems with surge headroom. |
| Pb-free and RoHS compliant | Meets EU Directive 2011/65/EU - simplifies compliance documentation and eliminates lead-based solder compatibility concerns. |
| Low thermal resistance (RJC) | 1.92 °C/W - allows rapid heat transfer to heatsink, supporting higher duty-cycle pulse operation than comparable TO-126 devices. |
Applications
| DC Motor Driver Stage | Relay Interface Circuit |
|---|---|
Use Scenario: Driving 24 V, 5 A brushed DC motors in automated gate controllers. IC Role / Device Role / Timing Role: Main switching element in emitter-follower configuration, handling bidirectional current during braking. Use Value: High hFE reduces MCU GPIO current demand; VCE(sat) ≤ 2.0 V minimizes I²R losses at full load. |
Use Scenario: Isolating and amplifying microcontroller outputs to energize 12 V/1 A electromagnetic relays. IC Role / Device Role / Timing Role: Single-transistor relay driver with integrated turn-off resistor eliminating external components. Use Value: Built-in shunt resistor ensures fast, deterministic relay release - critical for safety-critical interlock sequencing. |
| Linear Audio Output Stage | Industrial Heater Control |
Use Scenario: Class-A/B output stage in low-frequency (<20 kHz) audio amplifiers for public address systems. IC Role / Device Role / Timing Role: Current-amplifying output device biased in linear region for analog signal reproduction. Use Value: Stable hFE across temperature (−65°C to +150°C) maintains consistent gain; low Cob avoids high-frequency instability. |
Use Scenario: Phase-angle controlled AC heating element driver in programmable oven controllers. IC Role / Device Role / Timing Role: DC-side switch controlling TRIAC gate current in zero-crossing solid-state relay modules. Use Value: 100 V VCEO(sus) withstands line-voltage transients; 65 W PD supports short-duration overload pulses during ramp-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TIP122 | Lower VCEO(sus) = 100 V (same), but hFE = 1000 min @ IC = 3 A; RJC = 2.5 °C/W (worse); no built-in shunt resistor. | Requires external base pull-down; less suitable for direct GPIO drive without added components. | Select when higher DC gain is prioritized over guaranteed turn-off speed and board space is available for discrete resistor. |
| BDX53C | Identical electrical specs and pinout; differs only in marking (TU suffix indicates tape-and-reel packaging per ON Semi ordering code). | No functional difference - TU denotes packaging format, not performance variant. | Choose BDX53CTU for automated SMT placement; BDX53C for manual prototyping or rail delivery. |
Compared with TIP122, BDX53CTU offers guaranteed turn-off via integrated shunt resistor and superior thermal resistance, while BDX53C is functionally identical but supplied in different packaging - making BDX53CTU optimal for production-ready, space-constrained designs requiring robust switching behavior.
Availability
BDX53CTU is available at Aetrix Electronics and suitable for DC motor control, relay interface, linear audio output, and industrial heater control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for BDX53CTU 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.
The BDX53CTU belongs to onsemi's legacy plastic medium-power complementary transistor family, engineered for general-purpose amplifier and low-speed switching roles where reliability, thermal robustness, and ease of use outweigh ultra-high-frequency requirements.
FAQ
What is the maximum continuous collector current rating for BDX53CTU?
The BDX53CTU is rated for 8.0 Adc continuous collector current at TC = 25°C. This value decreases with rising case temperature - derating is 0.48 W/°C above 25°C. At TC = 100°C, the usable power dissipation drops to ~27 W, limiting practical continuous current to approximately 4.5 A depending on VCE and heatsink efficiency. Always verify junction temperature using RJC = 1.92 °C/W in thermal calculations for BDX53CTU.
Does BDX53CTU have a built-in base-emitter shunt resistor?
Yes, the BDX53CTU incorporates a monolithic base-emitter shunt resistor as part of its Darlington structure. This feature ensures reliable turn-off without requiring an external pull-down resistor, simplifying interface design with microcontrollers or logic gates. The resistor value is not specified individually but is optimized to provide adequate base discharge while maintaining high DC current gain - a defining characteristic confirmed in the official onsemi datasheet for BDX53CTU.
What is the collector-emitter sustaining voltage (VCEO(sus)) specification for BDX53CTU?
The BDX53CTU has a minimum collector-emitter sustaining voltage VCEO(sus) of 100 Vdc at IC = 100 mAdc and IB = 0. This rating reflects the device's ability to block voltage under active switching conditions - distinct from breakdown voltage - and provides design margin for inductive load flyback and line transients. It applies specifically to the "C" grade variant; BDX53B grades specify only 80 Vdc, confirming BDX53CTU's enhanced voltage capability.
Is BDX53CTU RoHS compliant and lead-free?
Yes, BDX53CTU is manufactured as a Pb-free device and complies with the EU RoHS Directive 2011/65/EU. The "G" suffix in the full orderable part number (e.g., BDX53CG) explicitly denotes RoHS-compliant packaging, and the BDX53CTU variant follows the same material composition and finish. This ensures compatibility with lead-free reflow profiles and eliminates regulatory barriers for export into environmentally regulated markets.
What package type does BDX53CTU use and how is it mounted?
BDX53CTU uses the TO-220 package (Case 221A, Style 1), featuring four leads: Base (Pin 1), Collector (Pin 2), Emitter (Pin 3), and redundant Collector (Pin 4). The metal tab is electrically connected to both collector pins and serves as the primary thermal path - it must be mechanically fastened to a heatsink using thermal interface material. Electrical isolation from the heatsink is required unless the collector is referenced to system ground.
BDX53CTU 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):
- 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-220-3
BDX53CTU FAQ
1.How can I place an order for BDX53CTU through Aetrix?
Please submit a Request for Quotation (RFQ) for BDX53CTU 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 BDX53CTU reliable?
The price and inventory of BDX53CTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDX53CTU is usually 5 days.
3.What payment methods are accepted for BDX53CTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDX53CTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BDX53CTU?
BDX53CTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BDX53CTU 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 BDX53CTU?
For technical support, including BDX53CTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDX53CTU requirements.
6.How does Aetrix verify that BDX53CTU is sourced from the original manufacturer or authorized distributors?
All BDX53CTU 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 BDX53CTU meets industry standards.
7.What is the process for return or replacement of BDX53CTU?
All BDX53CTU units undergo pre-shipment inspection (PSI). If there is an issue with BDX53CTU, 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 BDX53CTU part is unused and in its original packaging.
Return procedure for BDX53CTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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