BD241-S Equivalent & Substitute Parts Reference

Part Overview

The BD241-S, manufactured by Bourns Inc., is an NPN Bipolar Junction Transistor (BJT) specifically designed for general-purpose applications. This component features a maximum collector-emitter voltage of 45 V, collector current up to 3 A, and is housed in a TO-220-3 through-hole package with a maximum power dissipation of 2 W. The product status for the BD241-S is listed as Obsolete. It is therefore necessary to identify alternative or substitute models to ensure ongoing design support and inventory continuity for systems where this transistor is specified.

Key Parameters

Parameter	BD241-S
Manufacturer	Bourns Inc.
Category	Transistors, Bipolar (BJT)
Transistor Type	NPN
Current - Collector (Ic) (Max)	3 A
Voltage - Collector Emitter Breakdown (Max)	45 V
Vce Saturation (Max) @ Ib, Ic	1.2V @ 600mA, 3A
Current - Collector Cutoff (Max)	300µA
DC Current Gain (hFE) (Min) @ Ic, Vce	10 @ 3A, 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

Substitution is determined strictly by matching the key electrical and mechanical parameters relevant to NPN power BJTs. The required parameters for consideration include: Transistor Type, Maximum Collector Current (Ic), Collector-Emitter Breakdown Voltage (Vce), Saturation Voltage (Vce sat), DC Current Gain (hFE), Maximum Power Dissipation, Package/Case, Mounting Type, Operating Temperature Range, and RoHS compliance status. Only parts that align with these specified values have been included as substitutes.

Parameter Comparison

Parameter	BD241-S (Bourns Inc.)	TIP31AG (onsemi)
Category	Transistors, Bipolar (BJT)	Transistors, Bipolar (BJT)
Transistor Type	NPN	NPN
Current - Collector (Ic) (Max)	3 A	3 A
Voltage - Collector Emitter Breakdown (Max)	45 V	60 V
Vce Saturation (Max) @ Ib, Ic	1.2V @ 600mA, 3A	1.2V @ 375mA, 3A
Current - Collector Cutoff (Max)	300µA	300µA
DC Current Gain (hFE) (Min) @ Ic, Vce	10 @ 3A, 4V	10 @ 3A, 4V
Power - Max	2 W	2 W
Operating Temperature	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)
Mounting Type	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The BD241-S is listed as obsolete. The TIP31AG is designated as Active, RoHS3 Compliant, and conforms to all technical specifications required by the key parameters. Both devices are available in TO-220-3 packages and maintain equivalent electrical ratings and mechanical mounting. For continued compliance with RoHS3 and uninterrupted product availability, the TIP31AG meets all selection and regulatory criteria.

Frequently Asked Questions (FAQ)

Q1: What are the most important parameters when selecting a substitute for the BD241-S BJT?
A1: The main considerations are Transistor Type (NPN), Maximum Collector Current (3 A), Collector-Emitter Breakdown Voltage (≥45 V), Saturation Voltage, DC Current Gain, Power Dissipation, Package (TO-220-3), Mounting Type (Through Hole), Operating Temperature Range, and RoHS Status.

Q2: Is the package type of the substitute part identical to the BD241-S?
A2: Yes, both BD241-S and TIP31AG are supplied in TO-220-3 through-hole packages.

Q3: Are there any differences in collector-emitter breakdown voltage or other operating limits?
A3: The TIP31AG provides a higher collector-emitter breakdown voltage (60 V vs 45 V) but matches all other key ratings provided.

Q4: Is the substitute part RoHS compliant and suitable for applications under RoHS3 environmental requirements?
A4: Yes, both the BD241-S and TIP31AG are specified as RoHS3 Compliant.

Q5: Does the substitute part support the same operating temperature range?
A5: Yes, both parts support -65°C to 150°C (TJ).

Q6: What are the key mechanical compatibility considerations?
A6: The TO-220-3 package and through-hole mounting type are maintained, ensuring mechanical compatibility and ease of substitution.

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