BD240B Equivalent & Substitute Parts

Part Overview

The BD240B is a PNP bipolar junction transistor manufactured by onsemi, rated for 80 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 BD240B delivers 30 W maximum power dissipation and operates at junction temperatures up to 150°C.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	2	A
Power - Max	30	W
Vce Saturation (Max)	700 mV @ 200 mA, 1 A	—
DC Current Gain (hFE) (Min)	15 @ 1 A, 4 V	—
Operating Temperature (Max)	150	°C (TJ)
Package / Case	TO-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the BD240B is determined by the following critical parameters: transistor type (PNP), collector-emitter breakdown voltage rating (80 V minimum), maximum collector current capability (2 A minimum), package type (TO-220-3), and mounting method (through hole). Substitute parts must maintain electrical compatibility within these boundaries while accommodating application-specific requirements for current handling, power dissipation, and thermal performance.

The substitute parts are grouped into two categories based on their electrical characteristics relative to the BD240B:

Category 1: Direct Current Rating Equivalents — Parts with collector current ratings at or above 2 A and 80 V breakdown voltage, suitable for direct replacement in applications requiring the BD240B's baseline specifications.

Category 2: Enhanced Performance Alternatives — Parts with higher current ratings or power dissipation capabilities, applicable when design margins or future scalability are required.

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
BD240B	onsemi	PNP	2	80	30	700 mV @ 200 mA, 1 A	15 @ 1 A, 4 V	TO-220-3	Obsolete
BD242BG	onsemi	PNP	3	80	40	1.2 V @ 600 mA, 3 A	25 @ 1 A, 4 V	TO-220-3	Last Time Buy
TIP32BG	onsemi	PNP	3	80	2	1.2 V @ 375 mA, 3 A	10 @ 3 A, 4 V	TO-220-3	Active
TIP32C	STMicroelectronics	PNP	3	100	2	1.2 V @ 375 mA, 3 A	10 @ 3 A, 4 V	TO-220-3	Active
D45VH10G	onsemi	PNP	15	80	83	1 V @ 800 mA, 8 A	20 @ 4 A, 1 V	TO-220-3	Active

Engineering Selection Recommendations

BD242BG (onsemi) — This part maintains the 80 V breakdown voltage and TO-220-3 package of the BD240B while providing 3 A collector current and 40 W power dissipation. The BD242BG is classified as Last Time Buy, indicating limited future availability. RoHS3 compliance is confirmed.

TIP32BG (onsemi) — This active product offers 3 A collector current and 80 V breakdown voltage in the TO-220-3 package. The TIP32BG is actively manufactured and carries RoHS3 compliance. Power dissipation is rated at 2 W, which is lower than the BD240B; this part is suitable for applications where thermal management is not a primary constraint.

TIP32C (STMicroelectronics) — This active product provides 3 A collector current in a TO-220-3 package with an elevated 100 V breakdown voltage rating. The TIP32C is actively produced with RoHS3 compliance and MSL rating of 1 (Unlimited). Power dissipation is rated at 2 W.

D45VH10G (onsemi) — This active product delivers significantly higher performance with 15 A collector current, 80 V breakdown voltage, and 83 W power dissipation in the TO-220-3 package. The D45VH10G is suitable for applications requiring enhanced current handling and thermal capacity. RoHS3 compliance is confirmed.

Frequently Asked Questions (FAQ)

Q: Can the BD240B be directly replaced with the BD242BG?

A: The BD242BG maintains the same 80 V breakdown voltage and TO-220-3 package as the BD240B. The BD242BG provides higher collector current (3 A versus 2 A) and greater power dissipation (40 W versus 30 W), making it electrically compatible for direct substitution. However, the BD242BG is classified as Last Time Buy, indicating limited future availability.

Q: What is the difference between TIP32BG and TIP32C?

A: Both parts are active products in the TO-220-3 package with 3 A collector current ratings. The TIP32C, manufactured by STMicroelectronics, has a higher breakdown voltage rating of 100 V compared to the TIP32BG's 80 V. Both parts have identical power dissipation ratings of 2 W. The TIP32C offers additional voltage margin for applications operating near the 80 V limit.

Q: Is the D45VH10G suitable as a substitute for the BD240B?

A: The D45VH10G maintains the 80 V breakdown voltage and TO-220-3 package of the BD240B. However, the D45VH10G is rated for 15 A collector current and 83 W power dissipation, significantly exceeding the BD240B's 2 A and 30 W specifications. The D45VH10G is applicable when higher current capacity and thermal performance are required, but it is not necessary for applications designed to the BD240B's baseline ratings.

Q: Are all substitute parts RoHS3 compliant?

A: BD242BG, TIP32BG, TIP32C, and D45VH10G are all confirmed RoHS3 compliant. The original BD240B does not carry an explicit RoHS3 designation in the provided data.

Q: What is the significance of product status when selecting a substitute?

A: Product status indicates manufacturing availability and long-term support. Active products (TIP32BG, TIP32C, D45VH10G) are currently manufactured and supported. Last Time Buy status (BD242BG) indicates limited future availability. Obsolete status (BD240B) indicates the part is no longer manufactured. For new designs and long-term production, active products are preferred.

Q: Can I use a substitute part with a higher breakdown voltage than the BD240B?

A: Yes. A higher breakdown voltage rating provides additional safety margin and does not compromise circuit operation. The TIP32C, rated for 100 V, can be used in applications designed for the BD240B's 80 V rating without functional degradation.

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