My Inquiry
My Account
onsemi BDX33BG
- Part No.:
- BDX33BG
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BDX33BG.pdf
- Description:
- TRANS NPN DARL 80V 10A TO-220
- Quantity:
- Payment:
- Shipping:
Inventory:9
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BDX33BG from onsemi is an NPN Darlington silicon power transistor in TO-220 package, rated for 80 VCEO(sus), 10 A continuous collector current, and 70 W dissipation at TC = 25°C, with typical hFE = 2500 at IC = 4.0 A - used in low-speed switching power supplies and motor control circuits.
For engineers reviewing the BDX33BG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, safe operating area limits, and direct alternatives for industrial linear and switching power stages.
Technical Context
The BDX33BG integrates monolithic Darlington construction with built-in base-emitter shunt resistors to ensure stable turn-off and reduce external component count. Its high DC current gain (hFE ≥ 750 min at IC = 3.0 A) enables low-base-drive switching in relay drivers and lamp ballasts.
Rated for VCEO(sus) = 80 Vdc (min) at IC = 100 mA and VCE(sat) ≤ 2.5 V at IC = 3.0 A/ IB = 6.0 mA, it operates reliably within thermally limited SOA boundaries up to 150°C junction temperature, with RJC = 1.78°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO(sus) | 80 Vdc minimum - sustains 80 V across C–E at 100 mA with zero base drive, defining maximum off-state blocking capability |
| IC (continuous) | 10 Adc - supports sustained load currents up to 10 A with heatsink at TC = 25°C |
| PD @ TC = 25°C | 70 W - total power dissipation limit before thermal derating begins |
| hFE (min) | 750 at IC = 3.0 A, VCE = 3.0 V - ensures low base current requirement (≤12 mA) for full saturation |
| VCE(sat) | 2.5 V max at IC = 3.0 A, IB = 6.0 mA - defines conduction loss in saturated switching mode |
| RJC | 1.78°C/W - junction-to-case thermal resistance determines heatsink sizing for target TJ |
Pinout & Package
BDX33BG uses the TO-220-3 (Case 221A, Style 1) package with metal tab connected to collector. The device has three terminals: Base (Pin 1), Collector (Pin 2), Emitter (Pin 3). Pin 4 is not present - the mechanical outline shows only three leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Base | Control input requiring ~6 mA base current to saturate at 3 A collector load |
| Pin 2 | Collector | High-current output node tied to metal tab; electrically connected to heatsink mounting surface |
| Pin 3 | Emitter | Current return path; referenced to system ground in common-emitter configurations |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic Darlington structure | Integrates driver and output transistors on one die, eliminating inter-stage wiring and parasitic inductance |
| Built-in base-emitter shunt resistor | Ensures reliable turn-off without external pull-down; prevents leakage-induced false triggering |
| High hFE (2500 typ.) | Reduces required base drive current by >10× vs. single bipolar transistors, easing microcontroller interface |
| Pb-free and RoHS-compliant | Meets EU Directive 2011/65/EU; compatible with lead-free reflow soldering profiles |
| TO-220 mechanical robustness | Standardized footprint supports automated assembly and field-replaceable heatsink mounting |
Applications
| DC Motor Control | Relay Driver Circuit |
|---|---|
|
Use Scenario: Driving 24 V, 5 A brushed DC motors in industrial actuators with PWM-based speed regulation. IC Role / Device Role / Timing Role: NPN Darlington switch controlling motor current path between supply rail and ground. Use Value: High hFE allows direct MCU GPIO drive; VCEO(sus) = 80 V accommodates inductive kickback without snubber. |
Use Scenario: Replacing mechanical relays in PLC output modules handling 12–48 V AC/DC loads up to 8 A. IC Role / Device Role / Timing Role: High-gain switching element isolating logic-level control signals from high-power loads. Use Value: Low VCE(sat) minimizes self-heating during continuous duty; built-in shunt resistor eliminates external bias components. |
| Linear Power Supply Regulator | Lamp Dimming Ballast |
|
Use Scenario: Pass transistor in adjustable 0–30 V, 5 A bench power supply with analog voltage feedback loop. IC Role / Device Role / Timing Role: Series pass element dissipating excess input-output differential as heat. Use Value: 70 W rating and 1.78°C/W RJC support stable operation under worst-case dropout conditions with standard heatsinks. |
Use Scenario: Dimmable fluorescent lamp ballast using phase-cut AC control with zero-crossing detection. IC Role / Device Role / Timing Role: Main switching transistor conducting half-wave rectified line current during conduction phase. Use Value: Sustaining voltage margin (80 V) exceeds peak rectified 24 VAC waveform; thermal SOA curves validate 50/60 Hz duty cycling. |
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 |
|---|---|---|---|
| TIP122G | VCEO = 100 V, hFE = 1000 min, PD = 65 W, same TO-220 package | Higher voltage rating suits 100 V bus systems; lower gain requires higher base drive | Select when >80 V blocking is needed and base drive capability exceeds 12 mA |
| MJD122G | VCEO = 100 V, hFE = 1000 min, PD = 30 W, TO-252 (DPAK) surface-mount package | Lower power rating and SMT form factor limit use to <5 A continuous loads | Choose for space-constrained PCBs where thermal mass and heatsinking differ from through-hole TO-220 |
Compared with BDX33BG, TIP122G offers higher voltage headroom but reduced current gain, while MJD122G trades power handling and package type for board-area efficiency - both require layout and drive circuit review before substitution.
Availability
BDX33BG is available at Aetrix Electronics and suitable for industrial motor control, relay replacement, and linear power supply designs requiring stable component supply, long-lifecycle support, and Pb-free compliance.
Supply support for BDX33BG 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The BDX33BG belongs to onsemi's legacy silicon power transistor family designed specifically for rugged, low-speed switching and linear regulation in cost-sensitive industrial equipment.
FAQ
What is the maximum collector-emitter sustaining voltage of the BDX33BG?
The BDX33BG has a minimum collector-emitter sustaining voltage VCEO(sus) of 80 Vdc at IC = 100 mA with zero base current. This rating is confirmed in the Electrical Characteristics table and defines its safe off-state blocking capability in switching applications.
Does the BDX33BG include internal base-emitter resistors?
Yes, the BDX33BG features monolithic construction with built-in base-emitter shunt resistors, as stated in the Features section of the datasheet. This ensures reliable turn-off without requiring external pull-down components in most driver circuits.
What is the thermal resistance junction-to-case for the BDX33BG?
The BDX33BG has a thermal resistance RJC of 1.78°C/W, specified in the Thermal Characteristics table. This value is critical for calculating heatsink requirements to maintain junction temperature below 150°C under continuous load conditions.
Is the BDX33BG RoHS compliant and lead-free?
Yes, the "G" suffix in BDX33BG explicitly denotes a Pb-free and RoHS-compliant package, per the Marking Diagram and Ordering Information sections. It meets EU Directive 2011/65/EU and supports lead-free reflow soldering processes.
Can the BDX33BG be used in linear regulator applications?
Yes, the BDX33BG is rated for 70 W dissipation at TC = 25°C and exhibits stable SOA behavior up to 150°C junction temperature, making it suitable as a series pass transistor in adjustable linear power supplies where thermal management is implemented.
BDX33BG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Transistor Type:
- NPN - Darlington
- Current - Collector (Ic) (Max):
- 10 A
- Voltage - Collector Emitter Breakdown (Max):
- 80 V
- Vce Saturation (Max) @ Ib, Ic:
- 2.5V @ 6mA, 3A
- Current - Collector Cutoff (Max):
- 500µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 750 @ 3A, 3V
- Power - Max:
- 70 W
- Frequency - Transition:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
BDX33BG FAQ
1.How can I place an order for BDX33BG through Aetrix?
Please submit a Request for Quotation (RFQ) for BDX33BG 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 BDX33BG reliable?
The price and inventory of BDX33BG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDX33BG is usually 5 days.
3.What payment methods are accepted for BDX33BG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDX33BG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BDX33BG?
BDX33BG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BDX33BG 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 BDX33BG?
For technical support, including BDX33BG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDX33BG requirements.
6.How does Aetrix verify that BDX33BG is sourced from the original manufacturer or authorized distributors?
All BDX33BG 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 BDX33BG meets industry standards.
7.What is the process for return or replacement of BDX33BG?
All BDX33BG units undergo pre-shipment inspection (PSI). If there is an issue with BDX33BG, 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 BDX33BG part is unused and in its original packaging.
Return procedure for BDX33BG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BDX33BG Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
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.
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.
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…
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…
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…
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 …
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…
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…
