BD241A-S Equivalent & Substitute Parts Reference

Part Overview

The BD241A-S is an NPN bipolar junction transistor (BJT) manufactured by Bourns Inc., classified within the Transistors, Bipolar (BJT) category. Its key application aspects include a collector-emitter voltage of 60 V, maximum collector current of 3 A, a minimum current gain (hFE) of 25 at 1A and 4V, power dissipation up to 2 W, and TO-220 through-hole packaging.
This device is currently listed as Obsolete. For ongoing production, maintenance, or design requirements, the identification of equivalent or substitute NPN BJTs with matching key parameters is necessary.

Key Parameters

Parameter	BD241A-S Value
Transistor Type	NPN
Collector-Emitter Breakdown Voltage (Vce)	60 V
Collector Current (Ic) Max	3 A
Vce Saturation (Max) @ Ib, Ic	1.2V @ 600mA, 3A
Collector Cutoff Current (Max)	300µA
DC Current Gain (hFE) (Min) @ Ic, Vce	25 @ 1A, 4V
Power Dissipation (Max)	2 W
Operating Temperature	-65°C ~ 150°C (TJ)
Package / Case	TO-220-3
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for BD241A-S is determined by the following key parameters:

Transistor Type (NPN)
Collector-Emitter Breakdown Voltage (≥ 60 V)
Collector Current (Ic) (≥ 3 A)
DC Current Gain (hFE) (≥ 25 or close at comparable conditions)
Power Dissipation (≥ 2 W)
Package/Case (TO-220-3)
Mounting Type (Through Hole)
RoHS and MSL Compliance

Only substitute transistors meeting these criteria are listed.

Parameter Comparison

Manufacturer Part Number	Transistor Type	Vce (Max)	Ic (Max)	Vce(Sat) (Max) @ Ib, Ic	Collector Cutoff I (Max)	hFE (Min) @ Ic, Vce	Power - Max	Operating Temp	Package / Case	Mounting	RoHS	MSL	Product Status
BD241A-S	NPN	60 V	3 A	1.2V @ 600mA, 3A	300µA	25 @ 1A, 4V	2 W	-65°C ~ 150°C (TJ)	TO-220-3	Through Hole	ROHS3	1	Obsolete
2N6292G	NPN	70 V	7 A	3.5V @ 3A, 7A	1mA	30 @ 2A, 4V	40 W	-65°C ~ 150°C (TJ)	TO-220-3	Through Hole	ROHS3	NA	Active
2N6487G	NPN	60 V	15 A	3.5V @ 5A, 15A	1mA	20 @ 5A, 4V	1.8 W	-65°C ~ 150°C (TJ)	TO-220-3	Through Hole	ROHS3	NA	Active
2ST31A	NPN	60 V	3 A	1.2V @ 375mA, 3A	300µA	100 @ 20mA, 4V	40 W	150°C (TJ)	TO-220-3	Through Hole	ROHS3	1	Active
D44H8	NPN	60 V	10 A	1V @ 400mA, 8A	10µA	40 @ 4A, 1V	50 W	150°C (TJ)	TO-220-3	Through Hole	ROHS3	1	Active
MJE3055T	NPN	60 V	10 A	8V @ 3.3A, 10A	700µA	20 @ 4A, 4V	75 W	-55°C ~ 150°C (TJ)	TO-220-3	Through Hole	ROHS3	NA	Active
MJE3055TG	NPN	60 V	10 A	8V @ 3.3A, 10A	700µA	20 @ 4A, 4V	75 W	-55°C ~ 150°C (TJ)	TO-220-3	Through Hole	ROHS3	NA	Active
TIP29A	NPN	-	-	-	-	-	-	-	TO-220-3	Through Hole	ROHS3	1	Active
TIP29AG	NPN	60 V	1 A	700mV @ 125mA, 1A	300µA	15 @ 1A, 4V	2 W	-65°C ~ 150°C (TJ)	TO-220-3	Through Hole	ROHS3	NA	Active
TIP31A	NPN	60 V	3 A	1.2V @ 375mA, 3A	300µA	25 @ 1A, 4V	40 W	-65°C ~ 150°C (TJ)	TO-220-3	Through Hole	ROHS3	1	Active
TIP31AG	NPN	60 V	3 A	1.2V @ 375mA, 3A	300µA	10 @ 3A, 4V	2 W	-65°C ~ 150°C (TJ)	TO-220-3	Through Hole	ROHS3	NA	Active
TIP41AG	NPN	60 V	6 A	1.5V @ 600mA, 6A	700µA	15 @ 3A, 4V	2 W	-65°C ~ 150°C (TJ)	TO-220-3	Through Hole	ROHS3	NA	Last Time Buy

Engineering Selection Recommendations

Given that BD241A-S is classified as Obsolete, all substitute products listed are evaluated based on matching key parameters, RoHS3 environmental compliance, and comparable MSL. Where available, device status (Active, Last Time Buy) is noted to assist with sustained sourcing. Only products with appropriate status, package, compliance, and key parameter alignment are included.

Frequently Asked Questions (FAQ)

Q1: What electrical parameters are critical for substitution of the BD241A-S transistor?
A1: Key criteria are: NPN polarity, minimum 60 V collector-emitter voltage, at least 3 A collector current, comparable current gain (hFE), matching power dissipation capability, and equivalent TO-220-3 package.

Q2: Are all substitute parts compliant with RoHS requirements?
A2: All listed substitute part numbers are RoHS3 Compliant.

Q3: Is the physical form factor of substitute transistors consistent with BD241A-S?
A3: Yes, all substitutes are provided in TO-220-3 through-hole packaging.

Q4: How is part status considered in the selection of substitutes?
A4: Substitute devices are noted as Active, Last Time Buy, or Obsolete. Selection can be based on availability as indicated by their product status.

Q5: Which minimum DC current gain values (hFE) are considered suitable for direct substitution?
A5: Substitutes with DC current gain at or above 25 at comparable test conditions, or the closest available match in the data provided, are included.

Q6: What should be considered regarding power handling and environmental characteristics?
A6: Only transistors with equal or greater power dissipation and comparable operating temperature range to BD241A-S are listed as substitutes. All have RoHS3 compliance and similar or better MSL ratings.

Q7: Are all electrical characteristics, such as frequency response, covered for substitution?
A7: Only the parameters provided in the input data, specifically those common to BD241A-S and substitutes, are included in the comparison and substitution process.

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