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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi BD682

Name: BD682
Brand: onsemi
SKU: BD682
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BD682

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: BD682.pdf

Description:: TRANS PNP DARL 100V 4A TO-126

Quantity:: RFQ Add To RFQ list

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Inventory:6,089

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Product details

Overview

BD682 from onsemi is a plastic medium-power silicon PNP Darlington transistor rated for 100 V_CEO, 4.0 A collector current, and 40 W total device dissipation at T_C = 25 °C. It features high DC current gain (h_FE ≥ 750 at I_C = 1.5 A), low V_CE(sat) ≤ 2.5 V, and operates across −55 to +150 °C junction temperature range. It serves as an output stage device in complementary audio amplifier and motor control circuits.

For engineers reviewing the BD682 datasheet, pinout, applications, or equivalent options, key selection considerations include its 100 V breakdown rating, TO-225 package thermal resistance (R_θJC = 3.13 °C/W), Darlington configuration enabling high current drive with low base drive, and RoHS-compliant Pb-free construction.

Technical Context

The BD682 implements a monolithic PNP Darlington pair with integrated base-emitter resistor network optimized for general-purpose linear and switching applications. Its structure delivers high h_FE while maintaining controlled saturation characteristics (V_CE(sat) ≤ 2.5 V at I_C = 1.5 A, I_B = 30 mA) and robust safe operating area up to 100 V and 4 A.

It is explicitly complementary to the NPN BD681 series and shares identical TO-225 mechanical outline (Case 77−09, Style 1) with pin 1 = emitter, pins 2 & 4 = collector, pin 3 = base. Thermal derating begins above 25 °C at 0.32 W/°C, and secondary breakdown limits define its dynamic power envelope.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	100 V - Maximum collector-emitter voltage before breakdown; enables use in 80 V rail systems with margin.
I_C	4.0 A - Continuous collector current capability; supports medium-power load switching and amplification.
P_D @ T_C = 25 °C	40 W - Total device power dissipation at case temperature 25 °C; defines heatsink sizing baseline.
h_FE	≥ 750 - High DC current gain at I_C = 1.5 A, V_CE = 3 V; reduces required base drive current significantly.
V_CE(sat)	≤ 2.5 V - Low saturation voltage at I_C = 1.5 A, I_B = 30 mA; minimizes conduction loss in switching applications.
R_θJC	3.13 °C/W - Junction-to-case thermal resistance; determines temperature rise per watt dissipated into heatsink.

Pinout & Package

BD682 is housed in a TO-225 package (Case 77−09, Style 1), featuring three external terminals with pins 2 and 4 internally connected to the collector. The package includes a backside metal tab for thermal mounting and mechanical anchoring.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Emitter	Main current exit path; electrically isolated from case; connects to ground or low-side return in PNP configurations.
Pins 2 & 4	Collector	Internally bonded together; primary high-current input node; mounted to heatsink via metal tab for thermal management.
Pin 3	Base	Control terminal for Darlington pair; requires ~30 mA drive for full 1.5 A output; referenced to emitter potential.

Key Features

Feature	Design Value
Monolithic Darlington construction	Single-die integration eliminates inter-device matching drift and improves thermal coupling between driver and output transistors.
High h_FE ≥ 750	Reduces base drive circuit complexity and power consumption-enables direct microcontroller GPIO driving with minimal buffering.
100 V V_CEO rating	Supports operation in industrial 72 VDC bus systems and legacy telecom power supplies without additional clamping.
Pb-free and RoHS compliant	Meets global environmental compliance requirements; compatible with lead-free reflow soldering profiles (J-STD-020).

Applications

Audio Power Amplifier Output Stage	DC Motor Driver H-Bridge Leg
Use Scenario: Final output stage in Class AB push-pull audio amplifier delivering up to 25 W into 8 Ω loads. IC Role / Device Role / Timing Role: PNP Darlington output transistor providing high-current sourcing capability and low distortion under bias. Use Value: High h_FE ensures stable quiescent current setting; 100 V rating accommodates supply rails up to ±45 V with headroom.	Use Scenario: High-side switch in half-bridge or H-bridge motor driver controlling 24–48 V DC brushed motors. IC Role / Device Role / Timing Role: Medium-power PNP switching element handling bidirectional current during PWM commutation. Use Value: Low V_CE(sat) reduces conduction loss; TO-225 package allows direct heatsinking to chassis for thermal stability.
Linear Voltage Regulator Pass Element	Relay/Solenoid Driver Interface
Use Scenario: Series pass transistor in adjustable linear regulator supplying 3–12 V at up to 3 A for analog sensor subsystems. IC Role / Device Role / Timing Role: Current-amplifying pass element controlled by error amplifier feedback loop. Use Value: High current gain simplifies feedback compensation; 40 W dissipation supports >5 V dropout at full load without forced air.	Use Scenario: High-current interface between microcontroller and 12–24 V electromagnetic relays or solenoids drawing up to 3.5 A. IC Role / Device Role / Timing Role: Single-transistor Darlington switch replacing discrete BJT + driver combinations. Use Value: Eliminates need for external base resistor networks; built-in Darlington gain ensures reliable turn-on with 5 V logic-level drive.

Audio Power Amplifier Output Stage

DC Motor Driver H-Bridge Leg

Use Scenario: Final output stage in Class AB push-pull audio amplifier delivering up to 25 W into 8 Ω loads.

IC Role / Device Role / Timing Role: PNP Darlington output transistor providing high-current sourcing capability and low distortion under bias.

Use Value: High h_FE ensures stable quiescent current setting; 100 V rating accommodates supply rails up to ±45 V with headroom.

Use Scenario: High-side switch in half-bridge or H-bridge motor driver controlling 24–48 V DC brushed motors.

IC Role / Device Role / Timing Role: Medium-power PNP switching element handling bidirectional current during PWM commutation.

Use Value: Low V_CE(sat) reduces conduction loss; TO-225 package allows direct heatsinking to chassis for thermal stability.

Linear Voltage Regulator Pass Element

Relay/Solenoid Driver Interface

Use Scenario: Series pass transistor in adjustable linear regulator supplying 3–12 V at up to 3 A for analog sensor subsystems.

IC Role / Device Role / Timing Role: Current-amplifying pass element controlled by error amplifier feedback loop.

Use Value: High current gain simplifies feedback compensation; 40 W dissipation supports >5 V dropout at full load without forced air.

Use Scenario: High-current interface between microcontroller and 12–24 V electromagnetic relays or solenoids drawing up to 3.5 A.

IC Role / Device Role / Timing Role: Single-transistor Darlington switch replacing discrete BJT + driver combinations.

Use Value: Eliminates need for external base resistor networks; built-in Darlington gain ensures reliable turn-on with 5 V logic-level drive.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP Darlington transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJE703	Identical V_CEO = 100 V, I_C = 4 A, but lower h_FE min = 500; same TO-225 package and pinout.	Suitable for less demanding gain-stability requirements; may require higher base drive current.	Select MJE703 when cost sensitivity outweighs need for maximum h_FE margin.
BD682TG	Same die and electrical specs; differs only in packaging-supplied in rail format (50 units) vs. BD682G's box (500 units).	No functional difference; rail format preferred for prototyping or low-volume SMT-compatible manual assembly.	Choose BD682TG for evaluation or small-batch builds where rail handling is advantageous.

Compared with MJE703 and BD682TG, the BD682 offers superior DC current gain (≥750 vs. ≥500) for reduced base drive burden, while BD682TG provides identical performance in a different shipping configuration-making BD682 optimal for high-volume production requiring box-packaged logistics.

Availability

BD682 is available at Aetrix Electronics and suitable for audio amplifier output stages, DC motor driver H-bridge legs, and linear voltage regulator pass elements requiring stable component supply and long-term industrial availability.

Supply support for BD682 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 electronics, delivering power management, analog, sensors, and connectivity solutions.

The BD682 belongs to onsemi's plastic medium-power PNP Darlington family designed specifically for complementary output stages in general-purpose linear and switching amplifiers, emphasizing ruggedness, thermal reliability, and ease of drive.

FAQ

What is the maximum collector-emitter voltage rating for BD682?

The BD682 has a maximum collector-emitter voltage (V_CEO) rating of 100 Vdc, verified per onsemi's BD676/D datasheet Rev. 15. This rating applies under specified test conditions (I_C = 50 mA, I_B = 0) and defines the absolute upper limit before avalanche breakdown occurs. Exceeding this voltage risks permanent device failure.

Is BD682 pin-compatible with BD681?

Yes, BD682 is complementary to BD681 (NPN) and shares identical TO-225 package dimensions and pinout: pin 1 = emitter, pins 2 & 4 = collector, pin 3 = base. However, BD682 is PNP while BD681 is NPN-so they are not functionally interchangeable without circuit topology changes.

What is the DC current gain (h_FE) specification for BD682?

The BD682 guarantees minimum DC current gain (h_FE) of 750 at I_C = 1.5 A and V_CE = 3.0 Vdc, as confirmed in the Electrical Characteristics table of the official onsemi BD676/D datasheet. This high gain enables efficient base current utilization in driver and amplifier designs.

Does BD682 require a heatsink in normal operation?

Yes, BD682 requires a heatsink when dissipating more than ~5 W continuously. With R_θJC = 3.13 °C/W and max T_J = 150 °C, even modest power levels (e.g., 15 W at T_C = 70 °C) exceed safe junction temperature without thermal management. The metal tab must be electrically isolated and thermally coupled to the heatsink.

What is the difference between BD682G and BD682TG?

BD682G and BD682TG share identical electrical specifications, package (TO-225), and marking. The sole difference is packaging format: BD682G ships in boxes of 500 units, while BD682TG ships in rails of 50 units. Both are Pb-free and RoHS compliant, and both part numbers refer to the same silicon die and construction.

BD682 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP - Darlington

Current - Collector (Ic) (Max):: 4 A

Voltage - Collector Emitter Breakdown (Max):: 100 V

Vce Saturation (Max) @ Ib, Ic:: 2.5V @ 30mA, 1.5A

Current - Collector Cutoff (Max):: 500µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 750 @ 1.5A, 3V

Power - Max:: 40 W

Frequency - Transition:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126

BD682 FAQ

1.How can I place an order for BD682 through Aetrix?

Please submit a Request for Quotation (RFQ) for BD682 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 BD682 reliable?

The price and inventory of BD682 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD682 is usually 5 days.

3.What payment methods are accepted for BD682?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD682 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BD682?

BD682 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BD682 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 BD682?

For technical support, including BD682 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD682 requirements.

6.How does Aetrix verify that BD682 is sourced from the original manufacturer or authorized distributors?

All BD682 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 BD682 meets industry standards.

7.What is the process for return or replacement of BD682?

All BD682 units undergo pre-shipment inspection (PSI). If there is an issue with BD682, 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 BD682 part is unused and in its original packaging.

Return procedure for BD682:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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