BD442STU Equivalent & Substitute Parts

Part Overview

The BD442STU is an obsolete PNP bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 4 A maximum collector current. This device is packaged in TO-126-3 through-hole configuration and delivers 36 W maximum power dissipation with a 3 MHz transition frequency. Due to its obsolete product status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and component sourcing.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	4	A
Power - Max	36	W
Frequency - Transition	3	MHz
Mounting Type	Through Hole	—
Package / Case	TO-126-3	—
Operating Temperature (Max)	150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the BD442STU is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor type must be PNP
Voltage rating (Vce breakdown) must be 80 V or greater
Current rating (Ic max) must meet or exceed the application requirement
Power dissipation capability must support the circuit design
Through-hole mounting configuration must be maintained
TO-126 package family compatibility

Substitution Classification:

Direct Equivalent: BD442G maintains identical electrical specifications (80 V, 4 A, 36 W, 3 MHz) with active product status and improved temperature range (-55°C to 150°C). This part is the primary replacement for BD442STU applications.

Similar Substitutes: 2N4920G and BD140G are classified as similar substitutes due to reduced current or power ratings. These parts share the 80 V voltage rating and PNP configuration but operate within lower current envelopes (1 A and 1.5 A respectively) and reduced power dissipation (30 W and 1.25 W respectively). These substitutes are suitable only for applications where the reduced current and power specifications are acceptable.

Parameter Comparison

Parameter	BD442STU (Main)	BD442G (Direct)	2N4920G (Similar)	BD140G (Similar)
Manufacturer	onsemi	onsemi	onsemi	onsemi
Product Status	Obsolete	Active	Active	Active
Transistor Type	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V	80 V	80 V
Current - Collector (Ic) (Max)	4 A	4 A	1 A	1.5 A
Power - Max	36 W	36 W	30 W	1.25 W
Frequency - Transition	3 MHz	3 MHz	3 MHz	—
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-126-3	TO-126	TO-126	TO-126
Operating Temperature Range	—55°C to 150°C	—55°C to 150°C	—65°C to 150°C	—55°C to 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

BD442G (Direct Equivalent - Recommended Primary Substitute)

BD442G is the recommended substitute for BD442STU applications. This part maintains identical electrical specifications across all critical parameters: 80 V collector-emitter breakdown voltage, 4 A maximum collector current, 36 W power dissipation, and 3 MHz transition frequency. BD442G holds active product status, ensuring long-term availability and supply chain stability. The part is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. Operating temperature range extends from —55°C to 150°C, providing improved low-temperature performance compared to the original specification. Through-hole TO-126 packaging maintains mechanical compatibility with existing PCB designs.

2N4920G (Similar Substitute - Current-Limited Applications)

2N4920G is suitable for applications where collector current requirements do not exceed 1 A. This part shares the 80 V voltage rating and 3 MHz transition frequency with the main part but operates at reduced power dissipation (30 W). The part is active, ROHS3 compliant, and REACH unaffected. Operating temperature range of —65°C to 150°C provides extended low-temperature capability. Selection of this substitute requires confirmation that circuit current demands remain within the 1 A maximum specification.

BD140G (Similar Substitute - Low-Power Applications)

BD140G is applicable to circuits requiring maximum collector current of 1.5 A. This part maintains the 80 V voltage rating and through-hole TO-126 packaging but is limited to 1.25 W power dissipation. The part is active, ROHS3 compliant, and REACH unaffected. Operating temperature range of —55°C to 150°C is suitable for standard industrial applications. Selection of this substitute requires confirmation that circuit power dissipation and current demands remain within specified limits.

Frequently Asked Questions (FAQ)

Q: Can BD442G be used as a direct replacement for BD442STU in all applications?

A: Yes. BD442G maintains identical electrical specifications for voltage rating (80 V), collector current (4 A), power dissipation (36 W), and transition frequency (3 MHz). The part is mechanically compatible through TO-126 packaging and electrically equivalent across all critical parameters. BD442G is active and available, making it the primary substitute for obsolete BD442STU designs.

Q: What is the difference between BD442G and 2N4920G?

A: The primary difference is maximum collector current rating. BD442G is rated for 4 A maximum collector current, while 2N4920G is limited to 1 A. Both parts share the 80 V voltage rating and 3 MHz transition frequency. BD442G is suitable for high-current applications, while 2N4920G is appropriate only for circuits operating below 1 A collector current.

Q: Can 2N4920G or BD140G be used in place of BD442STU?

A: These parts are suitable only if the application circuit operates within their reduced current and power specifications. 2N4920G supports maximum 1 A collector current and 30 W power dissipation. BD140G supports maximum 1.5 A collector current and 1.25 W power dissipation. If the original design requires 4 A collector current or 36 W power dissipation, these substitutes are not appropriate. Use BD442G for full electrical equivalence.

Q: Are all substitute parts RoHS and REACH compliant?

A: Yes. BD442G, 2N4920G, and BD140G are all ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.

Q: What is the operating temperature range for each substitute?

A: BD442G and BD140G operate from —55°C to 150°C. 2N4920G operates from —65°C to 150°C, providing extended low-temperature capability. All parts support maximum junction temperature of 150°C.

Q: Are the substitute parts available in the same package as BD442STU?

A: BD442G, 2N4920G, and BD140G are all packaged in TO-126 through-hole configuration, which is mechanically compatible with TO-126-3 PCB layouts. Pin configuration and lead spacing remain consistent across these parts.

Q: What is the product status of each substitute?

A: BD442G, 2N4920G, and BD140G all hold active product status with onsemi, ensuring ongoing availability and supply chain support. BD442STU is obsolete and no longer manufactured.

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