BD441 Equivalent & Substitute Parts

Part Overview

The BD441 is a bipolar NPN transistor manufactured by STMicroelectronics, rated for 80 V collector-emitter breakdown voltage and 4 A maximum collector current with 36 W power dissipation capability. The device is housed in a Through Hole SOT-32 package (TO-225AA, TO-126-3 case styles) and is classified as obsolete product status. Due to its obsolete classification, identifying equivalent substitute parts with matching electrical and mechanical specifications is necessary for design continuity and procurement planning.

Substiute Parts

BD441

STMicroelectronicsIn Stock: 2370BD441 Datasheet

Current PartRFQ

BD441G

onsemiIn Stock: 2834BD441G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BD441 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match):

• Transistor Type: NPN
• Current - Collector (Ic) Max: 4 A
• Voltage - Collector Emitter Breakdown (Max): 80 V
• Power - Max: 36 W
• DC Current Gain (hFE) Min @ Ic, Vce: 40 @ 500mA, 1V
• Vce Saturation (Max): 800mV
• Current - Collector Cutoff (Max): 100µA

Mechanical Parameters (Must Match):

• Mounting Type: Through Hole
• Package / Case: TO-225AA, TO-126-3

The BD441G from onsemi meets all specified electrical and mechanical parameters and qualifies as a direct substitute. The BD441G maintains identical collector current, breakdown voltage, power rating, and current gain specifications while offering active product status and extended operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The BD441G from onsemi is a direct electrical and mechanical equivalent to the BD441. Selection of the BD441G is supported by the following factors:

Product Status: The BD441G maintains active product status, ensuring ongoing availability and manufacturer support, whereas the original BD441 is classified as obsolete.

Compliance Certifications: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent applications.

Electrical Specifications: All critical electrical parameters—collector current, breakdown voltage, power dissipation, current gain, and saturation voltage—are identical between the two parts.

Mechanical Compatibility: Both parts utilize Through Hole mounting with identical TO-225AA and TO-126-3 package configurations, ensuring direct PCB footprint compatibility.

Operating Temperature: The BD441G provides an extended operating temperature range (-55°C to 150°C) compared to the BD441 (150°C maximum), offering improved thermal margin in applications requiring lower temperature operation.

Frequently Asked Questions (FAQ)

Q: Can the BD441G be used as a direct replacement for the BD441 in existing designs?

A: Yes. The BD441G meets all electrical and mechanical specifications of the BD441. Both parts are NPN transistors with identical 4 A collector current, 80 V breakdown voltage, 36 W power rating, and Through Hole TO-126-3 package configuration. Direct substitution is supported without circuit modification.

Q: What is the primary advantage of selecting the BD441G over the BD441?

A: The BD441G offers active product status with ongoing manufacturer support and availability, whereas the BD441 is obsolete. Additionally, the BD441G provides an extended operating temperature range of -55°C to 150°C compared to the BD441's 150°C maximum rating.

Q: Are there any differences in package configuration between these parts?

A: Both parts use identical Through Hole mounting with TO-225AA and TO-126-3 case styles. PCB footprint compatibility is maintained, and no layout modifications are required.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the BD441 and BD441G are ROHS3 compliant and REACH unaffected, satisfying equivalent regulatory requirements for industrial and commercial applications.

Q: What is the significance of the Vce saturation specification difference?

A: The BD441 specifies 800mV saturation at 200mA base current and 2A collector current, while the BD441G specifies 800mV at 300mA base current and 3A collector current. Both achieve the same 800mV saturation voltage, confirming equivalent switching performance across the specified operating range.

Q: Is the BD441G available in the same packaging options as the BD441?

A: Yes. The BD441G is supplied in TO-126 packaging, which corresponds to the TO-225AA and TO-126-3 case styles used for the BD441. Through Hole mounting configuration is identical.