BD239CTU Equivalent & Substitute Parts

Part Overview

The BD239CTU is an NPN bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 2 A maximum collector current in a TO-220-3 through-hole package. This device is classified as Last Time Buy, indicating discontinued production status. The identification of equivalent and substitute parts addresses the need for alternative sourcing options for ongoing production requirements and design continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	-
Voltage - Collector Emitter Breakdown (Max)	100	V
Current - Collector (Ic) (Max)	2	A
Power - Max	30	W
Vce Saturation (Max) @ Ib, Ic	700mV @ 200mA, 1A	-
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 1A, 4V	-
Operating Temperature (Max)	150	°C
Package / Case	TO-220-3	-
Mounting Type	Through Hole	-

Substitute Part Grouping Explanation

Substitution eligibility for the BD239CTU is determined by the following critical parameters: transistor type (NPN), collector-emitter breakdown voltage (100 V), package configuration (TO-220-3), and mounting method (through hole). These parameters establish the functional and physical compatibility baseline.

Substitute parts are grouped into two categories:

Direct Equivalents maintain identical electrical ratings across all specified parameters, including maximum collector current (2 A) and power dissipation (30 W or compatible).

Similar Alternatives share the same voltage rating (100 V), package type (TO-220-3), and mounting method but differ in maximum collector current or power rating. These parts are suitable for applications where the circuit design accommodates the alternative current or power specifications.

The following parameters determine substitution validity: Voltage - Collector Emitter Breakdown (100 V), Package / Case (TO-220-3), Mounting Type (Through Hole), and Transistor Type (NPN).

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Ic (Max) [A]	Vce Breakdown (Max) [V]	Power (Max) [W]	Vce Sat (Max)	hFE (Min)	Package	Product Status
BD239CTU	onsemi	NPN	2	100	30	700mV @ 200mA, 1A	15 @ 1A, 4V	TO-220-3	Last Time Buy
BD239C	STMicroelectronics	NPN	2	100	2	700mV @ 200mA, 1A	15 @ 1A, 4V	TO-220-3	Active
TIP29CG	onsemi	NPN	1	100	2	700mV @ 125mA, 1A	15 @ 1A, 4V	TO-220-3	Active
TIP29C	NTE Electronics, Inc	NPN	1	100	2	700mV @ 125mA, 1A	15 @ 1A, 4V	TO-220-3	Active
TIP31CG	onsemi	NPN	3	100	2	1.2V @ 375mA, 3A	10 @ 3A, 4V	TO-220-3	Active
BD243CG	onsemi	NPN	6	100	65	1.5V @ 1A, 6A	15 @ 3A, 4V	TO-220-3	Active

Engineering Selection Recommendations

BD239C (STMicroelectronics) is the primary direct equivalent for BD239CTU replacement. This part maintains identical electrical specifications including 2 A maximum collector current and 100 V breakdown voltage. The BD239C is in Active product status with established supply availability (3724 units in stock). Both parts are ROHS3 compliant and REACH unaffected. The primary difference is maximum power rating (2 W versus 30 W); applications requiring the full 30 W dissipation capability must evaluate thermal management requirements.

TIP29CG and TIP29C are suitable alternatives for applications where maximum collector current can be reduced to 1 A. Both maintain the 100 V voltage rating and TO-220-3 package. TIP29CG (onsemi) and TIP29C (NTE Electronics, Inc) are in Active status. These parts are appropriate for lower-current circuit designs.

TIP31CG accommodates applications requiring up to 3 A collector current while maintaining 100 V breakdown voltage and TO-220-3 packaging. This part is in Active status and provides increased current capacity over the original BD239CTU specification.

BD243CG is suitable for applications requiring significantly higher current capacity (6 A) and power dissipation (65 W) while maintaining 100 V breakdown voltage and TO-220-3 package configuration. This part is in Active status and includes 3 MHz transition frequency specification.

All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original BD239CTU.

Frequently Asked Questions (FAQ)

Q: Can BD239C directly replace BD239CTU in all applications?

A: BD239C maintains identical electrical specifications (2 A, 100 V, NPN, TO-220-3) and is physically compatible. The primary consideration is maximum power rating: BD239C is rated 2 W while BD239CTU is rated 30 W. Applications operating at high power dissipation levels must verify thermal management compatibility with the lower power rating.

Q: What is the difference between TIP29CG and TIP29C?

A: Both parts share identical electrical specifications (1 A, 100 V, NPN, TO-220-3). TIP29CG is manufactured by onsemi; TIP29C is manufactured by NTE Electronics, Inc. Selection between these parts depends on supplier availability and procurement requirements.

Q: When should TIP31CG be selected over BD239C?

A: TIP31CG is selected when circuit design requires maximum collector current of 3 A. BD239C is limited to 2 A maximum collector current. Both maintain 100 V breakdown voltage and TO-220-3 packaging. TIP31CG provides additional current capacity for higher-load applications.

Q: Is BD243CG suitable for all BD239CTU applications?

A: BD243CG is suitable only for applications where the circuit design accommodates 6 A maximum collector current and 65 W power dissipation. The higher current and power ratings do not create compatibility issues in lower-current designs, but component selection should match actual circuit requirements to optimize cost and performance.

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

A: All substitute parts listed use TO-220-3 through-hole packaging, identical to BD239CTU. Physical mounting and thermal interface compatibility are maintained across all listed alternatives.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts are ROHS3 compliant. BD239C, TIP29CG, TIP31CG, and BD243CG are REACH unaffected. TIP29C (NTE Electronics, Inc) has vendor-undefined REACH status; verification with the supplier is required for applications with specific REACH compliance requirements.

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