BD1386S Equivalent & Substitute Parts

Part Overview

The BD1386S is a PNP bipolar junction transistor manufactured by onsemi, rated for 60 V collector-emitter breakdown voltage and 1.5 A maximum collector current in a Through Hole TO-126-3 package. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The BD1386S serves applications requiring moderate-power PNP switching and amplification in legacy and maintenance scenarios.

Substiute Parts

BD1386S

onsemiIn Stock: 871BD1386S Datasheet

Current PartRFQ

BD138G

onsemiIn Stock: 3681BD138G Datasheet

DirectRFQ

2N4919G

onsemiIn Stock: 15602N4919G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BD1386S is determined by strict electrical and mechanical parameter matching within the PNP bipolar transistor category. The primary substitution criteria are:

Critical Parameters for Direct Substitution:

• Transistor polarity (PNP)
• Voltage rating: 60 V collector-emitter breakdown minimum
• Current rating: 1.5 A collector current minimum
• Power dissipation: 1.25 W minimum
• Saturation voltage characteristics
• DC current gain (hFE) specifications
• Through Hole mounting compatibility
• TO-126-3 package compatibility

BD138G qualifies as a direct equivalent substitute. It maintains identical electrical specifications (60 V, 1.5 A, 1.25 W, matching saturation voltage and hFE parameters) and shares the same base product number (BD138). The BD138G is manufactured by onsemi with Active product status and ROHS3 compliance, providing superior availability and regulatory alignment compared to the obsolete BD1386S.

2N4919G is classified as a similar substitute with parameter deviations. While it maintains the 60 V voltage rating and Through Hole TO-126 package, the 2N4919G has a reduced maximum collector current (1 A versus 1.5 A) and significantly higher maximum power dissipation (30 W versus 1.25 W). The saturation voltage is higher (600mV @ 100mA, 1A), and the DC current gain is lower (30 @ 500mA, 1V). The 2N4919G is suitable only for applications where the 1 A current limit is acceptable and the higher power rating does not create thermal management conflicts.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred):

The BD138G is the recommended substitute for the obsolete BD1386S. Both components share identical electrical specifications and are manufactured by onsemi. The BD138G offers Active product status with 3600 units in stock, ensuring long-term availability. ROHS3 compliance of the BD138G provides regulatory alignment for modern manufacturing environments. The extended operating temperature range (-55°C to 150°C) of the BD138G provides additional thermal margin compared to the BD1386S specification of 150°C maximum.

For Current-Limited Applications:

The 2N4919G may be selected only when application requirements permit operation at 1 A maximum collector current. This component is classified as Last Time Buy, indicating limited future availability. The 2N4919G exhibits higher saturation voltage (600mV versus 500mV) and lower DC current gain (30 versus 40), which may affect circuit performance in precision switching applications. The significantly higher power rating (30 W) is not advantageous for 1.25 W applications and may introduce thermal design complications.

Compliance and Regulatory Considerations:

Both substitute parts maintain REACH Unaffected status consistent with the BD1386S. The BD138G provides superior compliance posture through ROHS3 certification. Selection should prioritize the BD138G for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can the BD138G be used as a direct replacement for the BD1386S without circuit modification?

A: Yes. The BD138G maintains identical electrical specifications for voltage rating (60 V), collector current (1.5 A), power dissipation (1.25 W), saturation voltage, and DC current gain. The TO-126-3 package is mechanically compatible. No circuit modification is required.

Q: What are the limitations of using the 2N4919G as a substitute?

A: The 2N4919G has a reduced maximum collector current rating of 1 A compared to the 1.5 A of the BD1386S. Applications requiring collector currents between 1 A and 1.5 A cannot use the 2N4919G. Additionally, the higher saturation voltage (600mV) and lower DC current gain (30) may affect switching speed and amplification characteristics in precision circuits.

Q: Why is the BD1386S classified as obsolete?

A: The BD1386S is an older component designation. The BD138G represents the current active equivalent from onsemi, offering improved availability, regulatory compliance (ROHS3), and extended temperature range specifications.

Q: Are there package compatibility concerns between the BD1386S and substitute parts?

A: All three components use Through Hole mounting with TO-126-3 package designation. Physical footprint and pin configuration are identical. No PCB layout modifications are required.

Q: What is the inventory status of substitute parts?

A: The BD138G has 3600 units in stock (Active status), providing reliable long-term availability. The 2N4919G has 1478 units in stock but is classified as Last Time Buy, indicating limited future procurement windows.

Q: Does the extended temperature range of the BD138G affect circuit performance?

A: The BD138G operating range of -55°C to 150°C encompasses the BD1386S specification of 150°C maximum. The extended lower temperature limit provides additional design margin for cold-environment applications without affecting performance at the upper temperature limit.