BD680ASTU PNP Darlington Transistor Equivalent & Substitute Parts

Part Overview

The BD680ASTU is a PNP Darlington bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 4 A maximum collector current. This device is designed for Through Hole mounting in TO-126-3 package configuration and is classified as Obsolete product status.

Due to the obsolete status of the BD680ASTU, identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and maintenance applications. The substitute parts listed maintain electrical compatibility within the specified parameter ranges while offering improved availability and, in some cases, enhanced performance characteristics.

Substiute Parts

BD680ASTU

onsemiIn Stock: 2061BD680ASTU Datasheet

Current PartRFQ

MJE703G

onsemiIn Stock: 2418MJE703G Datasheet

DirectRFQ

MJE702G

onsemiIn Stock: 37888MJE702G Datasheet

SimilarRFQ

BD680

STMicroelectronicsIn Stock: 8231BD680 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BD680ASTU is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Transistor Type: PNP - Darlington configuration
• Maximum Collector Current (Ic): 4 A minimum requirement
• Maximum Collector-Emitter Breakdown Voltage (VCEO): 80 V minimum requirement
• DC Current Gain (hFE): 750 minimum at specified test conditions
• Maximum Power Dissipation: Equal to or greater than 14 W

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: TO-225AA or TO-126-3 compatible footprints
• Supplier Device Package: TO-126-3 or equivalent pin configuration

Compliance Criteria:

• RoHS3 Compliance required
• REACH Unaffected status

The substitute parts MJE703G, MJE702G, and BD680 (STMicroelectronics variant) meet or exceed all specified electrical parameters and maintain mechanical and compliance compatibility with the BD680ASTU.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: BD680 (STMicroelectronics)

The STMicroelectronics BD680 is the preferred substitute for the BD680ASTU. This part maintains identical electrical specifications while offering Active product status, ensuring long-term availability and supply chain stability. The BD680 is ROHS3 compliant and REACH unaffected, meeting all regulatory requirements. The increased maximum power dissipation (40 W versus 14 W) provides additional thermal margin in applications. Inventory availability of 8200 pieces supports immediate procurement.

Secondary Recommendations: MJE703G and MJE702G (onsemi)

Both MJE703G and MJE702G are direct electrical equivalents manufactured by onsemi. These parts exceed the electrical specifications of the BD680ASTU with maximum power ratings of 40 W. Both devices are ROHS3 compliant and REACH unaffected. MJE702G offers the highest inventory availability at 37,790 pieces. MJE703G provides improved collector cutoff current specification (100µA versus 500µA). Both parts are classified as Obsolete; however, current inventory levels support near-term applications.

Compliance Verification

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original BD680ASTU specification.

Frequently Asked Questions (FAQ)

Q: Can the BD680ASTU be directly replaced with MJE703G or MJE702G?

A: Yes. Both MJE703G and MJE702G meet or exceed all electrical parameters of the BD680ASTU, including collector current (4 A), collector-emitter breakdown voltage (80 V), and DC current gain (750 minimum). Both devices use compatible TO-126-3 package configurations and Through Hole mounting. Pin configurations are identical.

Q: What is the primary advantage of using the STMicroelectronics BD680 over the onsemi alternatives?

A: The STMicroelectronics BD680 maintains Active product status, providing superior long-term availability and supply chain continuity compared to Obsolete alternatives. The increased power rating (40 W versus 14 W) offers additional thermal design margin. Inventory availability of 8200 pieces supports immediate procurement requirements.

Q: Are there package compatibility differences between the substitute parts?

A: All substitute parts use TO-126-3 package configuration compatible with the BD680ASTU. The STMicroelectronics BD680 is supplied in SOT-32-3 package format, which maintains identical pin configuration and Through Hole mounting compatibility. No PCB layout modifications are required.

Q: Do the substitute parts meet the same regulatory requirements as the BD680ASTU?

A: Yes. All substitute parts (MJE703G, MJE702G, and BD680) are ROHS3 compliant and REACH unaffected, matching the regulatory status of the BD680ASTU. All parts carry EAR99 ECCN classification and 8541.29.0095 HTSUS code.

Q: What is the difference in collector cutoff current between the BD680ASTU and the substitute parts?

A: The BD680ASTU and STMicroelectronics BD680 specify maximum collector cutoff current of 500µA. The MJE703G and MJE702G specify 100µA maximum. Lower collector cutoff current in the MJE series indicates improved leakage characteristics, which may provide performance benefits in low-power or precision applications.

Q: Can the substitute parts handle the same power dissipation as the BD680ASTU?

A: The BD680ASTU is rated for 14 W maximum power dissipation. All substitute parts (MJE703G, MJE702G, and BD680) are rated for 40 W maximum power dissipation, providing 2.86 times greater thermal capacity. This enhanced rating allows operation in higher power applications without thermal derating.

Q: Are there any differences in operating temperature range between the parts?

A: The BD680ASTU and STMicroelectronics BD680 specify maximum junction temperature of 150°C. The MJE703G and MJE702G specify operating temperature range of -55°C to 150°C, providing extended low-temperature operation capability. All parts support the same maximum operating temperature.