BD244A-S Equivalent & Substitute Parts Reference

Part Overview

The BD244A-S is a PNP bipolar junction transistor (BJT) with a maximum collector-emitter voltage of 60 V, collector current of 6 A, and a TO-220 through-hole package. The device is classified as obsolete, making sourcing the original part challenging. Finding alternative models is necessary for ongoing designs, repair, or production continuity where direct replacements or functionally similar transistors are needed.

Key Parameters

Manufacturer Part Number	Transistor Type	Voltage - Collector Emitter Breakdown (Max)	Current - Collector (Ic) (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Mounting Type	Package / Case	Operating Temperature (TJ)	RoHS Status
BD244A-S	PNP	60 V	6 A	1.5V @ 1A, 6A	700µA	15 @ 3A, 4V	2 W	Through Hole	TO-220-3	-65°C ~ 150°C	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution is determined strictly by matching or exceeding the following parameters: transistor polarity (PNP), maximum collector-emitter voltage of 60 V, maximum collector current of at least 6 A, through-hole mounting type, TO-220 package, DC current gain (hFE), power rating, and cutoff/saturation characteristics as specified. Substitute parts meeting or exceeding these criteria fall into two groups: direct substitutes (with matching electrical and mechanical specifications) and similar substitutes (with higher key rating values).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Transistor Type	Voltage - Collector Emitter Breakdown (Max)	Current - Collector (Ic) (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Mounting Type	Package / Case	Operating Temperature (TJ)	RoHS Status
BD244A-S	Bourns Inc.	PNP	60 V	6 A	1.5V @ 1A, 6A	700µA	15 @ 3A, 4V	2 W	Through Hole	TO-220-3	-65°C ~ 150°C	ROHS3 Compliant
TIP42A	NTE Electronics, Inc	PNP	60 V	6 A	1.5V @ 600mA, 6A	700µA	15 @ 3A, 4V	2 W	Through Hole	TO-220-3	150°C	RoHS non-compliant
TIP42AG	onsemi	PNP	60 V	6 A	1.5V @ 600mA, 6A	700µA	15 @ 3A, 4V	2 W	Through Hole	TO-220-3	-65°C ~ 150°C	ROHS3 Compliant
MJE2955T	NTE Electronics, Inc	PNP	60 V	10 A	8V @ 3.3A, 10A	700µA	20 @ 4A, 4V	75 W	Through Hole	TO-220-3	-55°C ~ 150°C	RoHS non-compliant
MJE2955TG	onsemi	PNP	60 V	10 A	8V @ 3.3A, 10A	700µA	20 @ 4A, 4V	75 W	Through Hole	TO-220-3	-55°C ~ 150°C	ROHS3 Compliant

Engineering Selection Recommendations

Select substitute parts based strictly on matching electrical parameters, package, and compliance requirements. For applications requiring RoHS compliance, use TIP42AG or MJE2955TG. For environments where RoHS status is not a requirement, TIP42A and MJE2955T are also candidate substitutes. The product status should be considered; all listed substitutes are currently active.

Frequently Asked Questions (FAQ)

Q: What criteria are used to determine a substitute for BD244A-S?
A: Substitutes are determined by matching transistor type, maximum collector-emitter voltage, maximum collector current, DC current gain, power rating, mechanical package, and mounting style.

Q: Are all substitute parts form-fit compatible with BD244A-S?
A: All listed substitutes use TO-220-3 through-hole packages, providing form, fit, and mechanical compatibility with BD244A-S.

Q: How does RoHS compliance affect substitute selection?
A: For applications requiring RoHS compliance, select parts labeled ROHS3 Compliant such as TIP42AG or MJE2955TG.

Q: Can higher-rated substitutes be used directly in place of BD244A-S?
A: Substitute parts with equal or higher ratings for voltage, current, and other parameters are suitable when all specified parameters are matched.

Q: Is there a difference in performance between direct and similar substitutes?
A: Substitutes listed as similar may have higher current or power ratings, with all specified minimums met or exceeded. Refer to the parameter table for direct comparison.

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