BD682 Equivalent & Substitute Parts

Part Overview

The BD682 is a PNP Darlington bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 4 A maximum collector current in a Through Hole TO-126 package. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The BD682 is suitable for applications requiring moderate power switching and amplification in PNP configurations.

Substiute Parts

BD682

onsemiIn Stock: 3338BD682 Datasheet

Current PartRFQ

BD682G

onsemiIn Stock: 33963BD682G Datasheet

DirectRFQ

BD682S

onsemiIn Stock: 1143BD682S Datasheet

UpgradeRFQ

BD682

onsemiIn Stock: 3338BD682 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BD682 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Transistor Type: PNP - Darlington configuration
• 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
• Operating Temperature: -55°C ~ 150°C (TJ)
• Mounting Type: Through Hole
• Package / Case: TO-225AA, TO-126-3

Parts meeting all these parameters are classified as direct equivalents. Parts with identical electrical specifications but different power ratings or package variants are classified as functional alternatives with noted limitations.

Parameter Comparison

Engineering Selection Recommendations

BD682G - Primary Substitute

The BD682G is the recommended substitute for the BD682. This part maintains complete electrical equivalence across all critical parameters: 4 A collector current, 100 V breakdown voltage, identical saturation characteristics, and matching DC current gain specifications. The BD682G is classified as Active product status, ensuring ongoing availability and supply chain continuity. The BD682G achieves ROHS3 compliance, addressing regulatory requirements that the original BD682 does not meet. Both parts utilize the TO-126 supplier device package, ensuring mechanical and thermal compatibility in existing PCB layouts. The BD682G is available in higher inventory quantities (33,900 pieces), supporting production requirements.

BD682S - Functional Alternative with Limitations

The BD682S provides electrical equivalence in switching and amplification characteristics but operates at reduced maximum power dissipation (14 W versus 40 W). The BD682S is suitable for applications where power dissipation does not exceed 14 W. The BD682S uses the TO-126-3 supplier device package, which differs from the BD682 TO-126 package; PCB layout modifications may be required. The BD682S specifies a maximum operating temperature of 150°C (TJ) without a minimum temperature specification, whereas the BD682 operates across -55°C to 150°C. The BD682S achieves ROHS3 compliance. Selection of BD682S is appropriate only when thermal and temperature operating range constraints align with application requirements.

Frequently Asked Questions (FAQ)

Q: Can BD682G be used as a direct replacement for BD682 in existing designs?

A: Yes. The BD682G maintains identical electrical specifications across collector current (4 A), breakdown voltage (100 V), saturation voltage, current gain, and operating temperature range (-55°C to 150°C). Both parts use the TO-126 package. The BD682G is the recommended substitute due to Active product status and ROHS3 compliance.

Q: What is the primary difference between BD682 and BD682S?

A: The BD682S has a maximum power rating of 14 W compared to 40 W for the BD682. The BD682S also specifies only a maximum operating temperature of 150°C without a minimum temperature specification, whereas the BD682 operates from -55°C to 150°C. All other electrical parameters are identical. The BD682S is suitable only for applications where power dissipation remains below 14 W and minimum temperature operation below -55°C is not required.

Q: Are there package compatibility concerns when substituting BD682 with BD682G?

A: No. Both BD682 and BD682G use the TO-126 supplier device package. PCB layouts, thermal management, and mechanical mounting are directly compatible.

Q: Does BD682G meet RoHS compliance requirements?

A: Yes. BD682G is ROHS3 compliant. The original BD682 is RoHS non-compliant. If RoHS compliance is a design requirement, BD682G is the appropriate selection.

Q: Why is BD682 classified as obsolete?

A: The BD682 is listed as obsolete product status. BD682G, the active equivalent, should be selected for new designs and ongoing production to ensure supply chain continuity.

Q: Can BD682S be used in applications requiring the full -55°C to 150°C operating temperature range?

A: No. BD682S specifies only a maximum operating temperature of 150°C without a defined minimum temperature. Applications requiring operation below -55°C must use BD682 or BD682G, which specify -55°C to 150°C operating range.

Q: What inventory availability should be considered when selecting between BD682G and BD682S?

A: BD682G has significantly higher inventory availability (33,900 pieces) compared to BD682S (1,062 pieces). For production planning and supply chain reliability, BD682G is the preferred selection.