BD243C Equivalent & Substitute Parts

Part Overview

The BD243C is an NPN bipolar junction transistor manufactured by onsemi, rated for 100 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 production continuity. The BD243C delivers 65 W maximum power dissipation and operates at junction temperatures up to 150°C.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	100	V
Current - Collector (Ic) (Max)	6	A
Power - Max	65	W
Vce Saturation (Max) @ Ib, Ic	1.5V @ 1A, 6A	V
Current - Collector Cutoff (Max)	700	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 3A, 4V	—
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the BD243C is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor Type: NPN (required match)
Voltage - Collector Emitter Breakdown (Max): 100 V (required match or higher)
Current - Collector (Ic) (Max): 6 A (required match or higher)
Vce Saturation: 1.5 V @ 1A, 6A (reference specification)
DC Current Gain (hFE) (Min): 15 @ 3A, 4V (reference specification)

Mechanical Compatibility Criteria:

Mounting Type: Through Hole (required match)
Package / Case: TO-220-3 or compatible TO-220 variants (required match)

Substitution Categories:

Direct Equivalents: Parts meeting all electrical parameters (100 V, 6 A, NPN) with identical or superior power ratings and matching package specifications.

Similar Alternatives: Parts with reduced current or power ratings that operate within the same voltage class and package family, suitable for applications not requiring full 6 A capability.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) [A]	Vce Breakdown (Max) [V]	Power (Max) [W]	Vce Sat @ Ib, Ic [V]	hFE (Min) @ Ic, Vce	Package	Temp Range [°C]
BD243C	onsemi	Obsolete	6	100	65	1.5 @ 1A, 6A	15 @ 3A, 4V	TO-220-3	—65 to 150
BD243CG	onsemi	Active	6	100	65	1.5 @ 1A, 6A	15 @ 3A, 4V	TO-220-3	—65 to 150
TIP41CG	onsemi	Active	6	100	2	1.5 @ 600mA, 6A	15 @ 3A, 4V	TO-220-3	—65 to 150
TIP41C	NTE Electronics, Inc	Active	6	100	2	1.5 @ 600mA, 6A	15 @ 3A, 4V	TO-220-3	—65 to 150
TIP41C-BP	Micro Commercial Co	Active	6	100	2	1.5 @ 600mA, 6A	15 @ 3A, 4V	TO-220-3	—65 to 150
TIP29CG	onsemi	Active	1	100	2	700mV @ 125mA, 1A	15 @ 1A, 4V	TO-220-3	—65 to 150
TIP31CG	onsemi	Active	3	100	2	1.2V @ 375mA, 3A	10 @ 3A, 4V	TO-220-3	—65 to 150
BD911	NTE Electronics, Inc	Active	15	100	90	3V @ 2.5A, 10A	40 @ 500mA, 4V	TO-220-3	—65 to 150

Engineering Selection Recommendations

Direct Replacement (Preferred):

BD243CG is the direct active equivalent to the obsolete BD243C. Both parts share identical electrical specifications (100 V, 6 A, 65 W) and package configuration (TO-220-3). BD243CG is manufactured by onsemi with active product status and ROHS3 compliance, making it the primary choice for direct substitution in existing designs.

Alternative Direct Replacements:

TIP41CG, TIP41C, and TIP41C-BP are functionally equivalent for applications where the full 65 W power rating is not required. All three parts deliver 6 A at 100 V in TO-220-3 packages with active product status. TIP41CG and TIP41C are ROHS3 compliant. These parts are suitable for designs operating at lower power dissipation levels.

Current-Limited Alternatives:

TIP29CG and TIP31CG operate at reduced maximum collector currents (1 A and 3 A respectively) while maintaining 100 V voltage rating and TO-220-3 packaging. These parts are suitable only for applications where collector current does not exceed their rated maximums. Both are ROHS3 compliant and active products.

Higher-Current Alternative:

BD911 provides 15 A maximum collector current and 90 W power dissipation at 100 V, exceeding BD243C specifications. This part is suitable for applications requiring higher current capacity. BD911 is not ROHS3 compliant and carries RoHS non-compliant status.

Compliance Considerations:

All recommended direct replacements (BD243CG, TIP41CG, TIP41C, TIP41C-BP) carry ROHS3 compliance certification. BD911 is RoHS non-compliant. Selection should account for end-product regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can BD243CG directly replace BD243C in existing designs?

A: Yes. BD243CG is the direct active equivalent with identical electrical specifications (100 V, 6 A, 65 W) and TO-220-3 package configuration. No circuit modifications are required.

Q: What is the difference between BD243CG and TIP41CG?

A: Both parts deliver 6 A at 100 V in TO-220-3 packages. The primary difference is maximum power dissipation: BD243CG is rated 65 W, while TIP41CG is rated 2 W. BD243CG is suitable for high-power applications; TIP41CG is suitable for lower-power designs. Both are ROHS3 compliant and active products.

Q: Can TIP29CG or TIP31CG replace BD243C?

A: TIP29CG and TIP31CG are not direct replacements due to reduced maximum collector current ratings (1 A and 3 A respectively, compared to 6 A for BD243C). These parts are suitable only for applications where collector current does not exceed their rated maximums. Both maintain 100 V voltage rating and TO-220-3 packaging.

Q: Is BD911 a suitable replacement for BD243C?

A: BD911 exceeds BD243C specifications with 15 A maximum collector current and 90 W power dissipation. It is suitable for applications requiring higher current capacity. However, BD911 is RoHS non-compliant, which may restrict use in regulated applications. Verify compliance requirements before selection.

Q: Are all substitute parts available in the same package?

A: All substitute parts listed are available in TO-220-3 or compatible TO-220 package variants (TO-220-3, TO-220, TO-220AB). These packages are mechanically and electrically interchangeable for through-hole mounting applications.

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

A: BD243CG, TIP41CG, TIP41C, TIP41C-BP, TIP29CG, TIP31CG, and BD911 all operate from —65°C to 150°C junction temperature. The original BD243C specification lists 150°C maximum without a minimum temperature range. Verify application temperature requirements before final selection.

Q: Which substitute part has the best compliance certification?

A: BD243CG, TIP41CG, TIP41C, TIP41C-BP, TIP29CG, and TIP31CG are all ROHS3 compliant. BD911 is RoHS non-compliant. For applications requiring RoHS compliance, select from the ROHS3-compliant alternatives.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message