BD244ATU Equivalent & Substitute Parts

Part Overview

The BD244ATU is a PNP bipolar junction transistor manufactured by onsemi, rated for 60 V collector-emitter breakdown voltage and 6 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The BD244ATU delivers 65 W maximum power dissipation and operates at junction temperatures up to 150°C.

Substiute Parts

BD244ATU

onsemiIn Stock: 798BD244ATU Datasheet

Current PartRFQ

TIP42AG

onsemiIn Stock: 1167TIP42AG Datasheet

DirectRFQ

TIP32AG

onsemiIn Stock: 2541TIP32AG Datasheet

SimilarRFQ

TIP42A

NTE Electronics, IncIn Stock: 14388TIP42A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BD244ATU is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Transistor type: PNP configuration
• Voltage rating: 60 V collector-emitter breakdown (minimum)
• Current rating: 6 A maximum collector current (minimum)
• Package: TO-220-3 through-hole mounting
• Vce saturation characteristics at specified bias conditions
• DC current gain (hFE) at specified operating points

Grouping Logic:

Direct Equivalents satisfy all primary criteria with identical or superior electrical specifications and active product status. These parts are pin-compatible and functionally interchangeable within the original design envelope.

Similar Substitutes meet the core voltage and package requirements but operate at reduced current ratings (3 A versus 6 A). These parts are suitable only for applications where collector current does not exceed the substitute part's maximum rating.

Parameter Comparison

Engineering Selection Recommendations

TIP42AG (onsemi) is the primary direct equivalent for BD244ATU replacement. This part maintains identical voltage (60 V), current (6 A), and saturation specifications while offering active product status and ROHS3 compliance. The TIP42AG is manufactured by the same supplier as the obsolete BD244ATU, ensuring design continuity and supply chain reliability.

TIP42A (NTE Electronics, Inc) provides an alternative direct equivalent with matching voltage and current ratings. This part is suitable for applications where onsemi-specific sourcing is not required. Note that TIP42A carries RoHS non-compliant status and should be evaluated against regulatory requirements for the target application.

TIP32AG (onsemi) is a similar substitute suitable only for applications where maximum collector current does not exceed 3 A. This part is not interchangeable with BD244ATU in designs requiring the full 6 A current capability. The TIP32AG offers ROHS3 compliance and active product status.

Selection between TIP42AG and TIP42A depends on compliance requirements and supply chain preferences. Both parts satisfy the electrical requirements for direct substitution. The TIP32AG should be selected only when application current requirements are confirmed below 3 A maximum.

Frequently Asked Questions (FAQ)

Q: Can TIP42AG directly replace BD244ATU in existing designs?

A: Yes. TIP42AG is a direct equivalent with identical voltage (60 V), current (6 A), and saturation characteristics. Pin configuration and TO-220-3 package are identical. No circuit modifications are required.

Q: What is the difference between TIP42AG and TIP42A?

A: Both parts are direct equivalents with identical electrical specifications (60 V, 6 A, 1.5 V saturation). The primary difference is manufacturer (onsemi versus NTE Electronics, Inc) and RoHS compliance status (TIP42AG is ROHS3 compliant; TIP42A is non-compliant). Electrical performance is equivalent.

Q: Can TIP32AG be used as a substitute for BD244ATU?

A: TIP32AG is a similar substitute only for applications where collector current does not exceed 3 A. The TIP32AG maximum current rating is 3 A, compared to 6 A for BD244ATU. Use TIP32AG only when application requirements confirm operation below 3 A maximum collector current.

Q: Are there package differences between these parts?

A: All substitute parts use TO-220-3 through-hole packaging, identical to BD244ATU. Mounting and thermal interface characteristics are equivalent. Supplier device package designations (TO-220 versus TO-220-3) refer to the same physical package.

Q: What is the significance of the power rating difference (65 W versus 2 W)?

A: The BD244ATU is rated for 65 W maximum power dissipation. The substitute parts (TIP42AG, TIP42A, TIP32AG) are rated for 2 W maximum power dissipation. This difference reflects thermal design specifications. Applications requiring sustained power dissipation above 2 W must include adequate heatsinking or thermal management to maintain junction temperature within operating limits.

Q: Which substitute part should be selected for new designs?

A: TIP42AG is the recommended selection for new designs. This part offers active product status, ROHS3 compliance, and onsemi manufacturing continuity with the obsolete BD244ATU. TIP42A is an acceptable alternative where onsemi-specific sourcing is not required and RoHS non-compliance is acceptable.