BD240CTU PNP Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The BD240CTU is a PNP 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 obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The BD240CTU delivers 30 W maximum power dissipation and operates at junction temperatures up to 150°C. Substitute parts must maintain electrical compatibility within the specified voltage, current, and power parameters while accommodating the through-hole TO-220-3 mounting requirement.

Key Parameters

Parameter	BD240CTU Value	Unit
Transistor Type	PNP	—
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	—
Current - Collector Cutoff (Max)	300	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 1A, 4V	—
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts for the BD240CTU are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Parameters (Must Match or Exceed):

Transistor Type: PNP (all substitutes)
Voltage - Collector Emitter Breakdown: 100 V minimum (substitutes rated 100 V, 120 V, or 150 V are acceptable)
Current - Collector (Ic) (Max): 2 A minimum (substitutes rated 2 A or higher are acceptable)
Mounting Type: Through Hole (all substitutes)
Package / Case: TO-220-3 (all substitutes use TO-220-3 or compatible TO-220 variants)

Secondary Parameters (Influence Selection):

Power - Max: 30 W baseline (substitutes range from 2 W to 90 W)
Vce Saturation: 700 mV baseline (substitutes range from 500 mV to 3 V)
DC Current Gain (hFE): 15 minimum baseline (substitutes range from 10 to 120)
Operating Temperature: 150°C baseline (substitutes support -65°C to 150°C or 150°C maximum)
Product Status: Active status preferred for long-term availability

Substitutes are grouped into three categories based on current rating: standard current (1–3 A), medium current (6 A), and high current (8–15 A). Within each group, parts maintain the 100 V voltage rating or higher, ensuring direct electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [A]	Vce Breakdown (Max) [V]	Power (Max) [W]	Vce Sat (Max) [mV]	hFE (Min)	Package	Product Status
BD240CTU	onsemi	2	100	30	700	15	TO-220-3	Obsolete
TIP30CG	onsemi	1	100	2	700	15	TO-220-3	Active
TIP32CG	onsemi	3	100	2	1200	10	TO-220-3	Active
TIP32C	STMicroelectronics	3	100	2	1200	10	TO-220-3	Active
TIP32C-BP	Micro Commercial Co	3	100	2	1200	10	TO-220-3	Active
BD242CG	onsemi	3	100	40	1200	25	TO-220-3	Active
BD244CG	onsemi	6	100	65	1500	15	TO-220-3	Active
TIP42CG	onsemi	6	100	2	1500	15	TO-220-3	Active
KSB546YTU	onsemi	2	150	25	1000	120	TO-220-3	Last Time Buy
MJE15029G	onsemi	8	120	50	500	20	TO-220-3	Active
BD912	NTE Electronics, Inc	15	100	90	3000	40	TO-220-3	Active

Engineering Selection Recommendations

Direct Replacement (Electrical Equivalence):

The TIP32CG (onsemi), TIP32C (STMicroelectronics), and TIP32C-BP (Micro Commercial Co) are direct electrical equivalents to the BD240CTU. All three parts share the 100 V collector-emitter breakdown voltage, accommodate the 2 A collector current requirement, and use the TO-220-3 package. These parts are classified as Active, ensuring long-term availability and supply chain stability. The TIP32CG variant from onsemi provides the closest manufacturer continuity.

Higher Current Capability Substitutes:

The BD242CG (3 A), BD244CG (6 A), TIP42CG (6 A), and MJE15029G (8 A) provide increased current handling while maintaining or exceeding the 100 V voltage rating. These parts are suitable for applications requiring current margins beyond the 2 A specification. All are Active status products. The BD242CG and BD244CG offer enhanced power dissipation (40 W and 65 W respectively) compared to the BD240CTU baseline of 30 W.

Higher Voltage Capability Substitute:

The KSB546YTU operates at 150 V collector-emitter breakdown, providing voltage margin for applications with transient overvoltage conditions. This part maintains the 2 A current rating and TO-220-3 package. However, KSB546YTU is classified as Last Time Buy, indicating limited future availability.

Lower Current Substitute:

The TIP30CG is rated for 1 A maximum collector current, below the BD240CTU specification of 2 A. This part is suitable only for applications with reduced current requirements and is not recommended as a general replacement.

Compliance Considerations:

All onsemi, STMicroelectronics, and Micro Commercial Co variants are ROHS3 compliant and REACH unaffected. The BD912 (NTE Electronics, Inc) is RoHS non-compliant and should be avoided in applications requiring RoHS certification.

Frequently Asked Questions (FAQ)

Q: Can TIP32CG directly replace BD240CTU in all applications?

A: Yes. TIP32CG matches the BD240CTU in collector-emitter breakdown voltage (100 V), supports the 2 A collector current requirement, and uses the identical TO-220-3 package. Both are PNP transistors with compatible saturation characteristics. TIP32CG is Active status, providing superior long-term availability compared to the obsolete BD240CTU.

Q: What is the difference between TIP32CG (onsemi), TIP32C (STMicroelectronics), and TIP32C-BP (Micro Commercial Co)?

A: All three parts share identical electrical specifications: 100 V breakdown voltage, 3 A maximum collector current, 1.2 V saturation voltage at specified conditions, and 10 minimum hFE. The differences are manufacturer source and packaging designation (TIP32C-BP uses TO-220AB variant). Selection depends on supply chain preference and availability. All are Active status.

Q: Can I use BD242CG or BD244CG as substitutes for BD240CTU?

A: Yes, with design margin considerations. BD242CG (3 A) and BD244CG (6 A) both exceed the 2 A current requirement and maintain 100 V breakdown voltage. These parts provide increased current handling capacity and higher power dissipation (40 W and 65 W respectively versus 30 W for BD240CTU). Use these substitutes when circuit design allows higher current capability or when thermal margin is required.

Q: Is KSB546YTU suitable as a substitute?

A: KSB546YTU is electrically compatible, matching the 2 A current rating and providing higher 150 V breakdown voltage. However, KSB546YTU is classified as Last Time Buy, indicating limited future production and availability. This part is suitable only for short-term production runs or applications where voltage margin justifies the supply risk.

Q: Why does BD912 have higher saturation voltage (3 V) compared to BD240CTU (700 mV)?

A: BD912 is rated for 15 A maximum collector current, significantly higher than the BD240CTU 2 A rating. Higher current capacity typically results in higher saturation voltage at comparable base current levels. BD912 is suitable only for high-current applications and introduces additional power dissipation in saturation. Additionally, BD912 is RoHS non-compliant, restricting use in regulated applications.

Q: What is the significance of the TO-220-3 package designation?

A: TO-220-3 is a three-lead through-hole package with standardized pin spacing and mounting hole geometry. All substitute parts listed use TO-220-3 or compatible TO-220 variants, ensuring mechanical interchangeability on printed circuit boards. The package supports direct thermal coupling to heatsinks via the center mounting tab.

Q: Can I use MJE15029G as a substitute for BD240CTU?

A: MJE15029G is electrically compatible but rated for 8 A maximum collector current and 120 V breakdown voltage, both exceeding BD240CTU specifications. This part is suitable for applications requiring higher current capacity or voltage margin. MJE15029G is Active status with 30 MHz transition frequency, supporting higher-speed switching applications compared to the BD240CTU baseline.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts except BD912 are ROHS3 compliant. BD912 (NTE Electronics, Inc) is RoHS non-compliant and must be avoided in applications subject to RoHS regulations or customer requirements. Verify compliance requirements before final part selection.

Q: What is the operating temperature range difference between BD240CTU and substitute parts?

A: BD240CTU and KSB546YTU specify 150°C maximum junction temperature. Most substitute parts (TIP32CG, TIP32C, TIP32C-BP, BD242CG, BD244CG, TIP42CG, MJE15029G) support -65°C to 150°C operating range, providing wider temperature margin. BD912 also supports -65°C to 150°C. Extended temperature range does not affect substitution compatibility for standard applications.

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