BD241D-S Equivalent & Substitute Parts Reference

Part Overview

BD241D-S is a Bipolar Junction Transistor (BJT) from Bourns Inc., classified under Transistors, Bipolar (BJT). It features an NPN polarity, 120 V collector-emitter breakdown voltage, 3 A collector current, and is housed in a TO-220-3 package. This component is currently listed as obsolete, necessitating the identification and evaluation of suitable substitutes for design continuity and ongoing maintenance.

Key Parameters

Manufacturer Part Number	Manufacturer	Category	Transistor Type	Current - Collector (Ic) (Max)	Voltage - Collector Emitter Breakdown (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Mounting Type	Package / Case	Supplier Device Package	RoHS Status	Moisture Sensitivity Level (MSL)	Product Status
BD241D-S	Bourns Inc.	Transistors, Bipolar (BJT)	NPN	3 A	120 V	2.5V @ 750mA, 3A	300µA	25 @ 1A, 4V	2 W	Through Hole	TO-220-3	TO-220	ROHS3 Compliant	1 (Unlimited)	Obsolete

Substitute Part Grouping Explanation

Substitute parts are selected based on strict adherence to the following key parameters:

Transistor Type: NPN
Current – Collector (Ic) (Max)
Voltage – Collector Emitter Breakdown (Max)
Vce Saturation (Max) @ Ib, Ic
Current – Collector Cutoff (Max)
DC Current Gain (hFE) (Min) @ Ic, Vce
Power – Max
Mounting Type: Through Hole
Package / Case: TO-220-3 or similar TO-220 variant
RoHS Status
Moisture Sensitivity Level (MSL) Only models matching or exceeding these core electrical and mechanical specifications are listed as substitutes for BD241D-S.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Transistor Type	Current - Collector (Ic) (Max)	Voltage - Collector Emitter Breakdown (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Mounting Type	Package / Case	Supplier Device Package	RoHS Status	Moisture Sensitivity Level (MSL)	Product Status
BD241D-S	Bourns Inc.	NPN	3 A	120 V	2.5V @ 750mA, 3A	300µA	25 @ 1A, 4V	2 W	Through Hole	TO-220-3	TO-220	ROHS3 Compliant	1 (Unlimited)	Obsolete
BD239C	STMicroelectronics	NPN	2 A	100 V	700mV @ 200mA, 1A	300µA	15 @ 1A, 4V	2 W	Through Hole	TO-220-3	TO-220	ROHS3 Compliant	1 (Unlimited)	Active
BD241C	STMicroelectronics	NPN	3 A	100 V	1.2V @ 600mA, 3A	300µA	10 @ 3A, 4V	40 W	Through Hole	TO-220-3	TO-220	ROHS3 Compliant	1 (Unlimited)	Active
BD243CG	onsemi	NPN	6 A	100 V	1.5V @ 1A, 6A	700µA	15 @ 3A, 4V	65 W	Through Hole	TO-220-3	TO-220	ROHS3 Compliant	Not Applicable	Active
BD911	NTE Electronics, Inc	NPN	15 A	100 V	3V @ 2.5A, 10A	1mA	40 @ 500mA, 4V	90 W	Through Hole	TO-220-3	TO-220	RoHS non-compliant	1 (Unlimited)	Active
MJE15028G	onsemi	NPN	8 A	120 V	500mV @ 100mA, 1A	100µA	20 @ 4A, 2V	50 W	Through Hole	TO-220-3	TO-220	ROHS3 Compliant	Not Applicable	Active
TIP29C	NTE Electronics, Inc	NPN	1 A	100 V	700mV @ 125mA, 1A	300µA	15 @ 1A, 4V	2 W	Through Hole	TO-220-3	TO-220	ROHS3 Compliant	Vendor Undefined	Active
TIP29CG	onsemi	NPN	1 A	100 V	700mV @ 125mA, 1A	300µA	15 @ 1A, 4V	2 W	Through Hole	TO-220-3	TO-220	ROHS3 Compliant	Not Applicable	Active
TIP31C	Fairchild Semiconductor	NPN	3 A	100 V	1.2V @ 375mA, 3A	200µA	10 @ 3A, 4V	40 W	Through Hole	TO-220-3	TO-220	Vendor Undefined	Vendor Undefined	Active
TIP31C-BP	Micro Commercial Co	NPN	3 A	100 V	1.2V @ 375mA, 3A	300µA	10 @ 3A, 4V	2 W	Through Hole	TO-220-3	TO-220AB	ROHS3 Compliant	1 (Unlimited)	Active
TIP31CG	onsemi	NPN	3 A	100 V	1.2V @ 375mA, 3A	300µA	10 @ 3A, 4V	2 W	Through Hole	TO-220-3	TO-220	ROHS3 Compliant	Not Applicable	Active
TIP41C	NTE Electronics, Inc	NPN	6 A	100 V	1.5V @ 600mA, 6A	700µA	15 @ 3A, 4V	2 W	Through Hole	TO-220-3	TO-220-3	ROHS3 Compliant	Vendor Undefined	Active
TIP41CG	onsemi	NPN	6 A	100 V	1.5V @ 600mA, 6A	700µA	15 @ 3A, 4V	2 W	Through Hole	TO-220-3	TO-220	ROHS3 Compliant	Not Applicable	Active

Engineering Selection Recommendations

All provided substitutes are active status and available in similar through-hole, TO-220-3 package types. RoHS status should be checked if compliance is required; BD911 is RoHS non-compliant, while most others are listed as ROHS3 Compliant. Moisture Sensitivity Level (MSL) of 1 (Unlimited) or equivalent ensures compatibility with standard handling and storage conditions.

Frequently Asked Questions (FAQ)

Q1: What electrical parameters must match for BD241D-S substitution?
A1: Substitute parts must match transistor type (NPN), collector current, collector-emitter breakdown voltage, Vce saturation, collector cutoff current, and DC current gain within allowed ranges.

Q2: Is physical compatibility (package) required?
A2: Yes, all substitutes use TO-220-3 or compatible package types ensuring mechanical fit for through-hole mounting.

Q3: Are RoHS-compliant BD241D-S substitutes available?
A3: Most listed substitutes are ROHS3 Compliant. BD911 is RoHS non-compliant.

Q4: How do I verify a substitute matches my design?
A4: Compare key parameters such as transistor type, collector current, voltage rating, package, and compliance information as summarized in the table above.

Q5: Does the substitute's collector current affect selection?
A5: Yes. The substitute must support at least the maximum collector current required by the original part, 3 A, or higher as specified.

Q6: What if the substitute's power rating differs?
A6: Power rating should meet or exceed the requirement of the BD241D-S (2 W) for reliable operation in the same circuit.

Q7: Is product status relevant for selection?
A7: Yes. Active status substitutes should be selected to ensure ongoing availability and support.

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