BD243C-S Equivalent & Substitute Parts

Part Overview

The BD243C-S is an NPN bipolar junction transistor manufactured by Bourns Inc., rated for 100 V collector-emitter breakdown voltage and 6 A maximum collector current in a TO-220 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The BD243C-S delivers 2 W maximum power dissipation and operates across a temperature range of -65°C to 150°C junction temperature.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	100	V
Current - Collector (Ic) (Max)	6	A
Power - Max	2	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	-65 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BD243C-S is determined by matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 100 V minimum
Current - Collector (Ic) (Max): 6 A minimum
Vce Saturation (Max) @ Ib, Ic: 1.5 V or lower at specified test conditions
Current - Collector Cutoff (Max): 700 µA or lower
DC Current Gain (hFE) (Min) @ Ic, Vce: 15 or higher at 3A, 4V
Package / Case: TO-220-3 or compatible TO-220 variant
Mounting Type: Through Hole

Direct Equivalents meet all primary matching criteria with identical or superior electrical performance and active product status.

Similar Parts meet the core voltage and current requirements but may differ in secondary parameters such as power dissipation, frequency response, or current gain specifications. These parts are suitable for applications where the BD243C-S specifications are not fully saturated.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [A]	Vce(br)eo [V]	Vce Sat [V]	Icbo (Max) [µA]	hFE (Min)	Power [W]	Package	Status
BD243C-S	Bourns Inc.	6	100	1.5 @ 1A, 6A	700	15 @ 3A, 4V	2	TO-220-3	Obsolete
BD243CG	onsemi	6	100	1.5 @ 1A, 6A	700	15 @ 3A, 4V	65	TO-220-3	Active
TIP41C	NTE Electronics, Inc	6	100	1.5 @ 600mA, 6A	700	15 @ 3A, 4V	2	TO-220-3	Active
TIP41C-BP	Micro Commercial Co	6	100	1.5 @ 600mA, 6A	700	15 @ 3A, 4V	2	TO-220-3	Active
TIP41CG	onsemi	6	100	1.5 @ 600mA, 6A	700	15 @ 3A, 4V	2	TO-220-3	Active
BD239C	STMicroelectronics	2	100	700mV @ 200mA, 1A	300	15 @ 1A, 4V	2	TO-220-3	Active
BD241C	STMicroelectronics	3	100	1.2 @ 600mA, 3A	300	10 @ 3A, 4V	40	TO-220-3	Active
BD911	NTE Electronics, Inc	15	100	3 @ 2.5A, 10A	1000	40 @ 500mA, 4V	90	TO-220-3	Active
KSC2334Y	Fairchild Semiconductor	7	100	600mV @ 500mA, 5A	10	120 @ 3A, 5V	1.5	TO-220-3	Active
KSC2334YTU	onsemi	7	100	600mV @ 500mA, 5A	10	120 @ 3A, 5V	1.5	TO-220-3	Active
KSD363RTU	onsemi	6	120	1 @ 100mA, 1A	1000	40 @ 1A, 5V	40	TO-220-3	Active

Engineering Selection Recommendations

Direct Equivalent Selection:

The BD243CG (onsemi), TIP41C (NTE Electronics, Inc), TIP41C-BP (Micro Commercial Co), and TIP41CG (onsemi) are direct functional equivalents to the BD243C-S. All four parts meet or exceed the primary electrical specifications: 6 A collector current, 100 V breakdown voltage, 1.5 V saturation voltage, and 15 minimum hFE at the specified test conditions. All are ROHS3 compliant and available in active product status with substantial inventory.

BD243CG offers superior power dissipation (65 W versus 2 W) and is manufactured by onsemi with active status and REACH compliance documentation.

TIP41C, TIP41C-BP, and TIP41CG maintain the 2 W power rating of the original BD243C-S while providing active product status. TIP41CG includes full temperature range operation (-65°C to 150°C) and REACH compliance.

Similar Part Selection:

BD239C (STMicroelectronics) and BD241C (STMicroelectronics) are suitable for applications where collector current requirements are lower than 6 A. BD239C is rated for 2 A maximum and BD241C for 3 A maximum. Both maintain 100 V breakdown voltage and TO-220-3 packaging.

BD911 (NTE Electronics, Inc) is suitable for applications requiring higher collector current (15 A) and power dissipation (90 W). This part is not ROHS3 compliant.

KSC2334Y (Fairchild Semiconductor) and KSC2334YTU (onsemi) provide 7 A collector current capability with superior DC current gain (120 minimum) but reduced power dissipation (1.5 W). KSC2334YTU includes ROHS3 compliance and REACH documentation.

KSD363RTU (onsemi) provides 6 A collector current with 120 V breakdown voltage and 40 W power dissipation. This part is suitable for applications requiring higher voltage margin.

Frequently Asked Questions (FAQ)

Q: Can BD243CG directly replace BD243C-S in all applications?

A: BD243CG meets all electrical specifications of BD243C-S and is pin-compatible in TO-220-3 packaging. The primary difference is increased power dissipation capability (65 W versus 2 W), which does not restrict its use in applications designed for the original part. BD243CG is manufactured by onsemi and carries active product status.

Q: What is the difference between TIP41C, TIP41C-BP, and TIP41CG?

A: All three parts are electrically equivalent with 6 A collector current and 100 V breakdown voltage. TIP41C is supplied by NTE Electronics, Inc in bag packaging. TIP41C-BP is supplied by Micro Commercial Co in tube packaging with TO-220AB case designation. TIP41CG is supplied by onsemi in tube packaging with full temperature range operation (-65°C to 150°C) and REACH compliance. Selection depends on packaging preference and supply chain requirements.

Q: When should BD239C or BD241C be used instead of direct equivalents?

A: BD239C (2 A maximum) and BD241C (3 A maximum) are suitable only for applications where the circuit design does not require the full 6 A collector current capability of the BD243C-S. These parts reduce cost and thermal management requirements in lower-current applications while maintaining 100 V breakdown voltage and TO-220-3 compatibility.

Q: Is KSC2334Y suitable as a substitute for BD243C-S?

A: KSC2334Y provides 7 A collector current, exceeding the 6 A specification of BD243C-S, and maintains 100 V breakdown voltage. However, power dissipation is reduced to 1.5 W. KSC2334Y is suitable for applications where the circuit operates within the 1.5 W thermal budget. KSC2334YTU (onsemi version) includes ROHS3 compliance and REACH documentation.

Q: What is the significance of the 120 V breakdown voltage in KSD363RTU?

A: KSD363RTU provides 120 V collector-emitter breakdown voltage compared to 100 V in BD243C-S. This higher voltage rating provides additional safety margin in applications subject to transient overvoltage conditions. KSD363RTU maintains 6 A collector current and TO-220-3 packaging with 40 W power dissipation and 10 MHz transition frequency.

Q: Are all substitute parts ROHS3 compliant?

A: BD243CG, TIP41C, TIP41C-BP, TIP41CG, BD239C, BD241C, KSC2334YTU, and KSD363RTU are ROHS3 compliant. BD911 is not ROHS3 compliant. KSC2334Y does not include ROHS status documentation in the provided specifications.

Q: What packaging options are available for direct equivalents?

A: BD243CG is supplied in tube packaging. TIP41C is supplied in bag packaging. TIP41C-BP is supplied in tube packaging with TO-220AB case designation. TIP41CG is supplied in tube packaging. All maintain TO-220-3 pin compatibility for through-hole mounting.

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