BD743C-S Equivalent & Substitute Parts Reference

Part Overview

The BD743C-S is a Bourns Inc. NPN bipolar junction transistor (BJT) designed for through-hole mounting in a TO-220 package. It features a collector-emitter breakdown voltage of 100 V, maximum collector current of 15 A, and a maximum power dissipation of 2 W. This transistor is classified as obsolete, making it necessary to identify alternative models that match its electrical and mechanical specifications for maintenance, repair, and new designs.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	100 V
Current - Collector (Ic) (Max)	15 A
Vce Saturation (Max) @ Ib, Ic	3V @ 5A, 15A
Current - Collector Cutoff (Max)	100µA
DC Current Gain (hFE) (Min) @ Ic, Vce	20 @ 5A, 4V
Power - Max	2 W
Operating Temperature	-65°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute NPN BJT transistor models have been identified based on the following strictly defined parameters:

Transistor type: NPN
Voltage - Collector Emitter Breakdown (Max)
Current - Collector (Ic) (Max)
Vce Saturation (Max) @ Ib, Ic
Current - Collector Cutoff (Max)
DC Current Gain (hFE) (Min) @ Ic, Vce
Power - Max
Mounting Type
Package / Case
Operating Temperature Range
RoHS Status

These parameters ensure electrical and mechanical compatibility for substitution within the "Transistors, Bipolar (BJT)" product category.

Parameter Comparison

Manufacturer Part Number	Transistor Type	Voltage - Collector Emitter Breakdown (Max)	Current - Collector (Ic) (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Operating Temperature	Mounting Type	Package / Case	RoHS Status
BD743C-S (Main)	NPN	100 V	15 A	3V @ 5A, 15A	100µA	20 @ 5A, 4V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant
BD239C	NPN	100 V	2 A	700mV @ 200mA, 1A	300µA	15 @ 1A, 4V	2 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant
BD241C	NPN	100 V	3 A	1.2V @ 600mA, 3A	300µA	10 @ 3A, 4V	40 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant
BD243CG	NPN	100 V	6 A	1.5V @ 1A, 6A	700µA	15 @ 3A, 4V	65 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant
BD911	NPN	100 V	15 A	3V @ 2.5A, 10A	1mA	40 @ 500mA, 4V	90 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	RoHS non-compliant
MJE15028G	NPN	120 V	8 A	500mV @ 100mA, 1A	100µA	20 @ 4A, 2V	50 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant
TIP29C	NPN	100 V	1 A	700mV @ 125mA, 1A	300µA	15 @ 1A, 4V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant
TIP29CG	NPN	100 V	1 A	700mV @ 125mA, 1A	300µA	15 @ 1A, 4V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant
TIP31C	NPN	100 V	3 A	1.2V @ 375mA, 3A	200µA	10 @ 3A, 4V	40 W	-	Through Hole	TO-220-3	-
TIP31CG	NPN	100 V	3 A	1.2V @ 375mA, 3A	300µA	10 @ 3A, 4V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant
TIP41C	NPN	100 V	6 A	1.5V @ 600mA, 6A	700µA	15 @ 3A, 4V	2 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant
TIP41CG	NPN	100 V	6 A	1.5V @ 600mA, 6A	700µA	15 @ 3A, 4V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant

Engineering Selection Recommendations

The BD743C-S is categorized as obsolete. For applications requiring continued RoHS compliance and consistent certification, select substitute NPN transistors with "ROHS3 Compliant" status and similar TO-220-3 package typology. The active status of substitutes indicates ongoing production and availability, facilitating procurement and design continuity.

Frequently Asked Questions (FAQ)

Q1: What key parameters determine if a substitute part is acceptable for BD743C-S replacement?
A: Electrical and mechanical compatibility is determined by transistor type (NPN), collector-emitter breakdown voltage, maximum collector current, maximum power dissipation, Vce saturation, current gain, operating temperature, mounting type, and TO-220-3 package.

Q2: Is package compatibility necessary for substitution?
A: Yes. TO-220-3 through-hole package ensures pin alignment and thermal performance matches the original BD743C-S.

Q3: How does RoHS compliance affect substitute selection?
A: Substitute parts marked "ROHS3 Compliant" meet regulatory requirements for hazardous substances, facilitating use in compliant product lines.

Q4: Can substitutes with higher collector current or voltage be used?
A: Selection is strictly based on provided specifications. Only values listed are considered.

Q5: Does product status influence substitute choice?
A: Active parts are preferred due to ongoing manufacturer support and availability. Obsolete or discontinued parts may present procurement challenges.

Q6: Are substitute parts from different manufacturers interchangeable?
A: Substitute parts are interchangeable only if they match the listed parameters for electrical and mechanical equivalence within the "Transistors, Bipolar (BJT)" category.

Q7: Is there any impact by moisture sensitivity or MSL?
A: For through-hole TO-220-3 devices, all provided substitutes have an unlimited or not applicable MSL rating, giving flexibility for storage and standard assembly processes.

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