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onsemi BDX54BG
- Part No.:
- BDX54BG
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BDX54BG.pdf
- Description:
- TRANS PNP DARL 80V 8A TO-220
- Quantity:
- Payment:
- Shipping:
Inventory:8,952
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Product details
Overview
BDX54BG from onsemi is a PNP complementary silicon Darlington power transistor in TO-220 package, rated for 8 A continuous collector current, 80 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 power control circuits.
For engineers reviewing the BDX54BG datasheet, pinout, applications, or equivalent options, key selection criteria include its built-in base-emitter shunt resistors, high DC current gain (hFE = 750 min @ IC = 3.0 A), low saturation voltage (VCE(sat) ≤ 2.0 V max @ IC = 3.0 A), and Pb-free RoHS-compliant TO-220 construction.
Technical Context
The BDX54BG implements a monolithic Darlington pair configuration with integrated base-emitter shunt resistors to ensure reliable turn-off and reduce external component count. It operates as a high-gain, medium-power PNP switch with sustained blocking capability up to 80 V under 100 mA base-open conditions.
Its thermal design centers on junction-to-case thermal resistance of 1.92°C/W and junction-to-ambient resistance of 70°C/W, supporting operation across −65°C to +150°C junction temperature range. Safe operating area (SOA) curves confirm second-breakdown-limited performance at pulse widths down to 100 µs and duty cycles ≤10%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO(sus) | 80 V min - sustains 80 V between collector and emitter with base open, enabling use in 48 V DC bus switching. |
| IC (continuous) | 8.0 A - supports load switching up to 8 A without forced cooling at case temperature ≤25°C. |
| PD @ TC = 25°C | 65 W - maximum power dissipation achievable with adequate heatsinking at 25°C case temperature. |
| hFE | 750 min @ IC = 3.0 A, VCE = 3.0 V - enables low-base-drive designs (e.g., ~12 mA base current for 3 A output). |
| VCE(sat) | 2.0 V max @ IC = 3.0 A, IB = 12 mA - limits conduction loss to ≤6 W at 3 A, critical for thermal management. |
| RJC | 1.92 °C/W - defines minimum heatsink requirement: ≤10.5°C/W heatsink needed to maintain TJ ≤150°C at 65 W. |
| TJ, Tstg | −65°C to +150°C - supports deployment in automotive under-hood and industrial motor-control environments. |
Pinout & Package
BDX54BG uses the TO-220-3 (Case 221A, Style 1) package with 4-terminal leadframe: pins 1–4 arranged linearly, where pins 2 and 4 are internally connected to the collector, pin 1 is base, and pin 3 is emitter. The metal tab is electrically connected to the collector and serves as primary thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Base | Control input node; accepts low-current drive (≤200 mA) to saturate the Darlington pair. |
| Pin 2 | Collector | Main high-current output terminal; electrically tied to metal tab for thermal and electrical connection. |
| Pin 3 | Emitter | Power return path; must be routed with low-inductance layout to minimize switching oscillation. |
| Pin 4 | Collector | Redundant collector connection; used for mechanical stability and enhanced current sharing in high-reliability layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic Darlington structure | Integrates driver and output transistors on one die, eliminating inter-stage wiring and improving reliability vs. discrete pairs. |
| Built-in base-emitter shunt resistors | Ensures active turn-off without external pull-down, reducing PCB footprint and preventing latch-up in inductive loads. |
| High hFE (750 min) | Permits direct drive from microcontrollers or logic gates without intermediate amplification stages. |
| Pb-free, RoHS-compliant TO-220 | Meets global environmental compliance requirements and supports lead-free reflow soldering processes. |
| 80 V VCEO(sus) rating | Supports operation in 48 V nominal systems with margin for inductive kickback and line transients. |
Applications
| DC Motor Reversing H-Bridge | Linear Regulator Pass Element |
|---|---|
|
Use Scenario: Bidirectional control of 24–48 V brushed DC motors in industrial actuators and valve drivers. IC Role / Device Role / Timing Role: PNP high-side switch in complementary H-bridge configuration, handling 5–7 A continuous motor current. Use Value: High hFE reduces gate-driver complexity; low VCE(sat) minimizes heat generation during forward conduction. |
Use Scenario: Series pass element in adjustable 3–40 V, 3–5 A linear power supplies for test equipment and analog subsystems. IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by dissipating excess input-output differential voltage. Use Value: 65 W power rating and 1.92°C/W RJC enable stable operation at full load with moderate heatsinking. |
| Relay/Contactor Driver | Overcurrent Protection Switch |
|
Use Scenario: Solid-state replacement for electromechanical relays controlling HVAC dampers, lighting ballasts, or solenoid valves. IC Role / Device Role / Timing Role: Low-speed switching element turning on/off 24–48 V, 2–6 A inductive loads with flyback suppression. Use Value: Built-in base shunt resistor ensures clean turn-off and eliminates need for external diode-resistor snubber networks. |
Use Scenario: Current-limiting switch in battery-powered tools or UPS inverters, tripping at >8 A sustained overtemperature. IC Role / Device Role / Timing Role: Primary current-handling switch whose thermal shutdown behavior enforces safe current ceiling. Use Value: Junction temperature range (−65°C to +150°C) and SOA curves allow predictable thermal foldback without external sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP Darlington power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD44H11G | TO-252 (DPAK), 80 V VCEO, 8 A IC, but hFE = 1000 min - higher gain, surface-mount only. | Requires PCB redesign for SMT assembly; unsuitable for through-hole legacy boards. | Select when space-constrained layouts demand DPAK footprint and higher gain justifies requalification. |
| BDX54C | Same TO-220 package, but rated for 100 V VCEO(sus) - higher blocking voltage, identical pinout and gain specs. | Direct upgrade path for 72 V or 96 V bus applications where 80 V margin is insufficient. | Choose when system transient voltage exceeds 80 V; no layout change required, but verify thermal derating at higher VCE. |
Compared with MJD44H11G, BDX54BG offers through-hole manufacturability and proven thermal performance in chassis-mounted heatsinks; compared with BDX54C, it trades 20 V blocking headroom for tighter parameter binning and legacy qualification in 48 V industrial systems.
Availability
BDX54BG is available at Aetrix Electronics and suitable for industrial motor control, linear power regulation, relay replacement, and overcurrent protection circuits requiring stable component supply and long-term obsolescence management.
Supply support for BDX54BG 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, and consumer markets.
The BDX54BG belongs to onsemi's plastic medium-power complementary transistor family, engineered for robust, cost-effective switching and amplification in non-high-frequency industrial power interfaces.
FAQ
What is the maximum continuous collector current rating for BDX54BG?
The BDX54BG is rated for 8.0 A continuous collector current (IC) at case temperature TC = 25°C. This rating assumes proper heatsinking; derating applies above 25°C at 0.48 W/°C. At elevated case temperatures, the usable current drops - e.g., ~5.5 A at TC = 75°C - per the power derating curve in the official onsemi datasheet.
Does BDX54BG have built-in base-emitter resistors?
Yes, the BDX54BG features monolithic construction with built-in base-emitter shunt resistors. This design ensures reliable turn-off without external pull-down components, simplifying circuit design for inductive load switching and reducing risk of unintended conduction during microcontroller reset or signal glitches.
Is BDX54BG pin-compatible with BDX54C?
Yes, BDX54BG and BDX54C share identical TO-220 package outline, pin assignment (Style 1), and terminal functions - pin 1 (base), pins 2 & 4 (collector), pin 3 (emitter). They are mechanically and electrically interchangeable on the same PCB, though BDX54C offers higher 100 V VCEO(sus) versus BDX54BG's 80 V rating.
What is the typical DC current gain (hFE) of BDX54BG at 3 A collector current?
The BDX54BG specifies a minimum DC current gain (hFE) of 750 at IC = 3.0 A and VCE = 3.0 V, with typical values exceeding 2500 under those conditions. This high gain allows efficient drive from low-current sources such as microcontroller GPIO pins or logic buffers without additional amplification stages.
Can BDX54BG be used in linear regulator applications?
Yes, the BDX54BG is suitable for linear regulator pass element applications due to its 65 W power dissipation capability at TC = 25°C, 1.92°C/W junction-to-case thermal resistance, and stable SOA up to 100 µs pulses. Its VCE(sat) ≤ 2.0 V at 3 A helps limit dropout-related losses, and its −65°C to +150°C operating range supports wide ambient deployment.
BDX54BG 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):
- 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:
- 65 W
- Frequency - Transition:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
BDX54BG FAQ
1.How can I place an order for BDX54BG through Aetrix?
Please submit a Request for Quotation (RFQ) for BDX54BG 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 BDX54BG reliable?
The price and inventory of BDX54BG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDX54BG is usually 5 days.
3.What payment methods are accepted for BDX54BG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDX54BG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BDX54BG?
BDX54BG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BDX54BG 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 BDX54BG?
For technical support, including BDX54BG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDX54BG requirements.
6.How does Aetrix verify that BDX54BG is sourced from the original manufacturer or authorized distributors?
All BDX54BG 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 BDX54BG meets industry standards.
7.What is the process for return or replacement of BDX54BG?
All BDX54BG units undergo pre-shipment inspection (PSI). If there is an issue with BDX54BG, 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 BDX54BG part is unused and in its original packaging.
Return procedure for BDX54BG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BDX54BG Tags
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