BD236STU Equivalent & Substitute Parts

Part Overview

The BD236STU is a PNP bipolar junction transistor manufactured by onsemi, rated for 60 V collector-emitter breakdown voltage and 2 A maximum collector current. This device is packaged in a TO-126-3 through-hole configuration and is designed for general-purpose switching and amplification applications with a maximum power dissipation of 25 W.

The BD236STU is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

BD236STU

onsemiIn Stock: 2017BD236STU Datasheet

Current PartRFQ

2N4919G

onsemiIn Stock: 15602N4919G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BD236STU is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

• Transistor polarity: PNP
• Voltage rating: 60 V collector-emitter breakdown (minimum)
• Current rating: Collector current capacity sufficient for application requirements
• Saturation voltage: Compatible with circuit switching characteristics
• Power dissipation: Adequate thermal handling capability
• Frequency response: Transition frequency of 3 MHz or higher
• Mounting configuration: Through-hole package type
• Package form factor: TO-126 or TO-225AA compatible pinout

The 2N4919G meets these criteria with the following considerations: it provides 60 V voltage rating, 3 MHz transition frequency, and through-hole TO-126 packaging. However, the 2N4919G is rated for a maximum collector current of 1 A, which is lower than the BD236STU's 2 A rating. This substitution is valid only for applications where the circuit current requirements do not exceed 1 A.

Parameter Comparison

Engineering Selection Recommendations

BD236STU (Primary Part): The BD236STU is classified as obsolete. While 2000 units are currently in stock, this part number is no longer in active production. Selection of this part is appropriate only for repair, maintenance, or replacement of existing systems where the original specification is mandatory.

2N4919G (Substitute Part): The 2N4919G is classified as Last Time Buy, indicating limited future availability. This part provides electrical equivalence to the BD236STU across voltage, saturation characteristics, frequency response, and thermal operating range. The primary limitation is the reduced maximum collector current rating of 1 A versus 2 A.

Compliance and Certifications: The 2N4919G carries RoHS3 compliance certification, whereas the BD236STU does not specify RoHS status. Both parts are REACH Unaffected and classified under ECCN EAR99. For applications requiring RoHS compliance, the 2N4919G is the appropriate selection.

Packaging Consideration: Both parts utilize compatible TO-126 package pinouts suitable for through-hole mounting. The BD236STU specifies TO-225AA and TO-126-3 packaging, while the 2N4919G specifies TO-225AA and TO-126 packaging. These package designations are mechanically and electrically compatible for standard through-hole circuit board applications.

Frequently Asked Questions (FAQ)

Q: Can the 2N4919G directly replace the BD236STU in all applications?

A: The 2N4919G provides electrical equivalence in voltage rating, saturation characteristics, and frequency response. However, the 2N4919G is rated for a maximum collector current of 1 A, compared to the BD236STU's 2 A rating. Direct substitution is valid only for circuits where the maximum collector current does not exceed 1 A.

Q: What is the difference between TO-126 and TO-126-3 packaging?

A: Both designations refer to the same three-lead through-hole package form factor used for power transistors. The pinout and mechanical dimensions are compatible. The numerical suffix may indicate manufacturing revision or supplier variation but does not affect electrical performance or interchangeability.

Q: Why is the 2N4919G classified as Last Time Buy?

A: Last Time Buy status indicates that the manufacturer has announced the end of production for this part number. Existing inventory will be sold until depletion, after which the part will no longer be available. This status reflects the industry-wide transition away from older discrete transistor designs.

Q: Are there any compliance differences between the BD236STU and 2N4919G?

A: The 2N4919G carries RoHS3 compliance certification, while the BD236STU does not specify RoHS status. Both parts are REACH Unaffected. For new designs or applications requiring RoHS compliance, the 2N4919G is the appropriate selection.

Q: What is the significance of the DC Current Gain (hFE) difference between these parts?

A: The BD236STU specifies a minimum hFE of 25 at 1 A and 2 V, while the 2N4919G specifies a minimum hFE of 30 at 500 mA and 1 V. These measurements are taken at different operating points and do not indicate incompatibility. Both values are within typical ranges for general-purpose PNP transistors and support equivalent switching and amplification performance.

Q: Can the 2N4919G handle the same power dissipation as the BD236STU?

A: The 2N4919G is rated for 30 W maximum power dissipation, compared to the BD236STU's 25 W rating. The 2N4919G provides superior thermal capability. However, actual power dissipation in a circuit is determined by collector current, collector-emitter voltage, and duty cycle. The 1 A current limitation of the 2N4919G may result in lower absolute power dissipation in high-current applications.