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onsemi BDX54CG
- Part No.:
- BDX54CG
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BDX54CG.pdf
- Description:
- TRANS PNP DARL 100V 8A TO-220
- Quantity:
- Payment:
- Shipping:
Inventory:4,115
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Product details
Overview
BDX54CG from onsemi is a PNP complementary silicon Darlington power transistor in TO-220 package, rated for 8 A continuous collector current, 100 V collector-emitter sustaining voltage (VCEO(sus)), and 65 W total device dissipation at TC = 25°C - designed for low-speed switching and general-purpose amplifier applications in industrial motor controls and relay drivers.
For engineers reviewing the BDX54CG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal behavior, safe operating area limits, built-in base-emitter shunt resistors, and real-world use context - all confirmed from onsemi's official Rev. 16 datasheet (November 2024).
Technical Context
The BDX54CG is a monolithic PNP Darlington pair with integrated base-emitter shunt resistors, enabling simplified biasing and improved turn-off speed over standard power transistors. Its structure supports high DC current gain (hFE = 750 min @ IC = 3.0 A) and low saturation voltage (VCE(sat) = 2.0 V max @ IC = 3.0 A, IB = 12 mA).
It operates across −65°C to +150°C junction temperature range, features RJC = 1.92°C/W and RJA = 70°C/W thermal resistance, and is Pb-free/RoHS compliant. Safe operating area (SOA) curves are defined up to 150°C, with second-breakdown-limited pulse performance validated per Figure 5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO(sus) | 100 Vdc minimum - sustains 100 V between collector and emitter at IC = 100 mA with base open, enabling use in 80–100 V DC supply rails. |
| IC (continuous) | 8.0 Adc - supports sustained load currents up to 8 A without derating at TC = 25°C, suitable for medium-power switching loads. |
| PD @ TC = 25°C | 65 W - maximum power dissipation at case temperature 25°C; derates linearly at 0.48 W/°C above 25°C. |
| hFE | 750 min @ IC = 3.0 A, VCE = 3.0 V - high DC gain reduces required base drive current, easing driver circuit design. |
| VCE(sat) | 2.0 V max @ IC = 3.0 A, IB = 12 mA - low saturation voltage minimizes conduction loss and heat generation in switching mode. |
| RJC | 1.92°C/W - enables efficient heat transfer from junction to case, critical for heatsink sizing in high-current applications. |
| Cob | 200 pF @ VCB = 10 V - output capacitance impacts switching speed; lower than NPN counterpart (300 pF), aiding PNP-side timing balance. |
Pinout & Package
BDX54CG uses TO-220 package (Case 221A, Style 1), with 4-terminal configuration: Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter, Pin 4 = Collector (dual-collector layout for enhanced thermal and current handling).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Base | Control input terminal; accepts base current to enable conduction; includes internal shunt resistor for improved turn-off reliability. |
| Pin 2 | Collector | Main high-side current path; electrically tied to Pin 4; connects to positive rail in high-side switch configurations. |
| Pin 3 | Emitter | Current return path; typically connected to load and ground; voltage referenced point for bias and sensing. |
| Pin 4 | Collector | Second collector terminal - parallel-connected to Pin 2 to reduce effective series resistance and improve thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic Darlington construction | Integrates driver and output transistors on one die, delivering high hFE without external components or layout complexity. |
| Built-in base-emitter shunt resistors | Ensures reliable turn-off by bleeding residual base charge, eliminating need for external pull-down resistors in many designs. |
| High VCEO(sus) rating (100 V) | Supports operation in 80–100 V industrial DC systems (e.g., PLC outputs, solenoid drivers) without external snubbers. |
| Low VCE(sat) (2.0 V max) | Reduces power loss at 3 A load to ≤6 W, lowering thermal stress and enabling smaller heatsinks in space-constrained enclosures. |
| Pb-free / RoHS-compliant packaging | TO-220G package meets global environmental compliance requirements and supports lead-free reflow soldering processes. |
Applications
| Industrial Relay Drivers | DC Motor Direction Control |
|---|---|
|
Use Scenario: Driving 24–48 V DC electromagnetic relays in programmable logic controllers (PLCs) and industrial I/O modules. IC Role / Device Role / Timing Role: High-current PNP switch providing low-side sinking or high-side sourcing of relay coils. Use Value: 100 V VCEO(sus) withstands inductive kickback; 8 A rating handles coil surge currents; built-in shunt resistor prevents relay chatter during microcontroller reset. |
Use Scenario: Bidirectional control of small DC motors (e.g., 12–36 V, <5 A) in automated valves, HVAC actuators, and robotic joints. IC Role / Device Role / Timing Role: Complementary PNP half-bridge element paired with BDX53C to form H-bridge output stage. Use Value: Matched VCEO, hFE, and VCE(sat) with BDX53C ensures balanced forward/reverse drive capability and thermal symmetry. |
| Linear Power Supply Pass Transistors | High-Voltage LED Current Regulators |
|
Use Scenario: Series pass element in adjustable linear regulators delivering up to 5 A at 12–30 V output from unregulated 40–80 V inputs. IC Role / Device Role / Timing Role: Voltage-controlled current source operating in active region under feedback loop regulation. Use Value: 65 W dissipation capacity and 1.92°C/W RJC allow stable operation with moderate heatsinking; high hFE eases error-amplifier drive requirements. |
Use Scenario: Constant-current sink for high-brightness LED strings powered from 48–72 V bus in architectural lighting and signage. IC Role / Device Role / Timing Role: PNP-controlled current regulator with sense-resistor feedback, placed between LED anode and supply rail. Use Value: 100 V rating accommodates string voltages up to 72 V plus margin; low VCE(sat) preserves headroom for sense and thermal compensation circuits. |
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 |
|---|---|---|---|
| MJD44H11G | TO-252 (DPAK), 8 A, 80 V VCEO, hFE = 1000 min - lower voltage rating, surface-mount package. | Limited to ≤80 V systems; requires PCB layout change; better suited for compact, automated assembly vs. through-hole TO-220. | Select when board space is constrained and 80 V suffices; verify SOA compatibility at elevated temperatures. |
| BDX54C | Same die and specs, but non-Pb-free (SnPb lead finish); identical pinout, ratings, and thermal performance. | No functional difference; only distinction is RoHS compliance status and soldering process compatibility. | Choose BDX54CG for new designs requiring RoHS compliance; BDX54C may be used where legacy SnPb assembly remains in place. |
Compared with MJD44H11G, BDX54CG offers higher voltage margin (100 V vs. 80 V) and through-hole mechanical robustness, while BDX54C provides identical performance without Pb-free processing - making BDX54CG the optimal choice for RoHS-compliant, high-voltage industrial switching where TO-220 mounting is preferred.
Availability
BDX54CG is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor direction control, linear power supply pass elements, high-voltage LED current regulators, and other medium-power analog switching applications requiring stable component supply and long-term manufacturability.
Supply support for BDX54CG 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 specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, medical, and IoT markets.
BDX54CG belongs to onsemi's plastic medium-power complementary silicon transistor family, engineered for rugged, cost-effective amplification and low-speed switching in industrial control, power conversion, and electromechanical actuation systems.
FAQ
What is the maximum continuous collector current rating for BDX54CG?
The BDX54CG is rated for 8.0 Adc continuous collector current at case temperature TC = 25°C. This rating decreases with rising case temperature - derating is 0.48 W/°C for power dissipation, and corresponding current limits must be calculated using the SOA curve in Figure 5 of the onsemi datasheet to avoid second breakdown or thermal runaway.
Does BDX54CG have built-in base-emitter resistors?
Yes, the BDX54CG features monolithic construction with built-in base-emitter shunt resistors. This design ensures reliable turn-off by discharging stored base charge without requiring external pull-down components - a key advantage over discrete Darlington configurations and standard power transistors.
What is the collector-emitter sustaining voltage (VCEO(sus)) of BDX54CG?
The BDX54CG has a minimum collector-emitter sustaining voltage of 100 Vdc at IC = 100 mAdc with base open. This parameter reflects its ability to block voltage under transient overvoltage conditions - critical for inductive load switching and ensuring robustness in 80–100 V DC industrial systems.
Can BDX54CG be used as a direct replacement for BDX54C?
BDX54CG is the Pb-free, RoHS-compliant version of BDX54C, sharing identical electrical specifications, pinout, thermal characteristics, and package dimensions. The only difference is the lead finish - SnPb for BDX54C versus matte tin for BDX54CG - so BDX54CG can replace BDX54C in new designs requiring RoHS compliance, provided soldering profiles match the Pb-free specification.
What is the thermal resistance junction-to-case (RJC) for BDX54CG?
The BDX54CG has a thermal resistance of RJC = 1.92°C/W, measured from junction to case under specified test conditions. This value is essential for heatsink selection - for example, at 65 W dissipation and 25°C case temperature, junction temperature reaches ~175°C, necessitating adequate heatsinking to stay within the −65°C to +150°C operating range.
BDX54CG 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
BDX54CG FAQ
1.How can I place an order for BDX54CG through Aetrix?
Please submit a Request for Quotation (RFQ) for BDX54CG 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 BDX54CG reliable?
The price and inventory of BDX54CG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDX54CG is usually 5 days.
3.What payment methods are accepted for BDX54CG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDX54CG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BDX54CG?
BDX54CG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BDX54CG 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 BDX54CG?
For technical support, including BDX54CG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDX54CG requirements.
6.How does Aetrix verify that BDX54CG is sourced from the original manufacturer or authorized distributors?
All BDX54CG 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 BDX54CG meets industry standards.
7.What is the process for return or replacement of BDX54CG?
All BDX54CG units undergo pre-shipment inspection (PSI). If there is an issue with BDX54CG, 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 BDX54CG part is unused and in its original packaging.
Return procedure for BDX54CG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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