BD539A-S Equivalent & Substitute Parts Reference

Part Overview

The BD539A-S by Bourns Inc. is a bipolar (BJT) NPN transistor, rated at 60 V, 5 A, 2 W in a TO-220 through-hole package. This product is classified as obsolete and is no longer in active production. It is necessary to identify alternative models to ensure ongoing manufacturing support, maintenance, and repair for designs that rely on BD539A-S.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	60 V
Current - Collector (Ic) (Max)	5 A
Vce Saturation (Max) @ Ib, Ic	1.5V @ 1A, 5A
Current - Collector Cutoff (Max)	300µA
DC Current Gain (hFE) (Min) @ Ic, Vce	12 @ 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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute transistors for BD539A-S have been identified strictly based on the following parameters: NPN transistor type, collector-emitter voltage rating, maximum collector current, Vce saturation voltage, cutoff current, minimum DC current gain (hFE), maximum power dissipation, operating temperature range, mounting type, package/case compatibility (TO-220-3), and RoHS compliance. Only transistors matching or exceeding these critical specifications are included.

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	Operating Temperature	Mounting Type	Package / Case	RoHS Status	Moisture Sensitivity Level (MSL)
BD539A-S	Bourns Inc.	NPN	60 V	5 A	1.5V @ 1A, 5A	300µA	12 @ 3A, 4V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	1 (Unlimited)
2N6292G	onsemi	NPN	70 V	7 A	3.5V @ 3A, 7A	1mA	30 @ 2A, 4V	40 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Not Applicable
2N6487G	onsemi	NPN	60 V	15 A	3.5V @ 5A, 15A	1mA	20 @ 5A, 4V	1.8 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Not Applicable
2SD1060S-1E	onsemi	NPN	50 V	5 A	300mV @ 300mA, 3A	100µA (ICBO)	140 @ 1A, 2V	1.75 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Not Applicable
2ST31A	STMicroelectronics	NPN	60 V	3 A	1.2V @ 375mA, 3A	300µA	100 @ 20mA, 4V	40 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	1 (Unlimited)
D44H8	STMicroelectronics	NPN	60 V	10 A	1V @ 400mA, 8A	10µA	40 @ 4A, 1V	50 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	1 (Unlimited)
MJE3055T	NTE Electronics, Inc	NPN	60 V	10 A	8V @ 3.3A, 10A	700µA	20 @ 4A, 4V	75 W	-55°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Not Applicable
MJE3055TG	onsemi	NPN	60 V	10 A	8V @ 3.3A, 10A	700µA	20 @ 4A, 4V	75 W	-55°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Not Applicable
TIP29A	Solid State Inc.	NPN	-	-	-	-	-	-	-	Through Hole	TO-220-3	ROHS3 Compliant	1 (Unlimited)
TIP29AG	onsemi	NPN	60 V	1 A	700mV @ 125mA, 1A	300µA	15 @ 1A, 4V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Not Applicable
TIP31A	Solid State Inc.	NPN	60 V	3 A	1.2V @ 375mA, 3A	300µA	25 @ 1A, 4V	40 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	1 (Unlimited)
TIP41AG	onsemi	NPN	60 V	6 A	1.5V @ 600mA, 6A	700µA	15 @ 3A, 4V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Not Applicable

Engineering Selection Recommendations

When selecting a substitute for BD539A-S, the following criteria apply:

The substitute must be RoHS compliant.
The package must be TO-220-3 and mounting type must be through-hole, to ensure footprint and mechanical compatibility.
Moisture Sensitivity Level (MSL) should be 1 (Unlimited) or Not Applicable for maximum assembly flexibility.
Product status should be "Active" or "Last Time Buy" for continued manufacturer support.

Frequently Asked Questions (FAQ)

Q1: Which key parameters are essential when selecting an equivalent for BD539A-S?
A1: The key parameters are transistor type (NPN), collector-emitter voltage rating (60 V), maximum collector current (5 A), Vce saturation, minimum DC current gain (hFE), mounting type, package/case compatibility (TO-220-3), RoHS status, and MSL.

Q2: Does the substitute need to match the product’s mounting type and package?
A2: Yes. Compatibility with the through-hole, TO-220-3 package is required to ensure direct replacement without modifications.

Q3: Why is RoHS compliance relevant for substitutes?
A3: RoHS compliance is essential for environmental, regulatory, and supply chain requirements.

Q4: Is it acceptable to use substitutes with higher voltage, current, or power ratings?
A4: Substitute parts with higher voltage, current, or power ratings are included when they meet or exceed the critical values of the BD539A-S specification.

Q5: How important is product status when choosing substitutes?
A5: Only substitutes with “Active” or “Last Time Buy” status are recommended to ensure continued availability for production and servicing.

Q6: Are all listed substitutes guaranteed to match all electrical behaviors?
A6: All substitutes are matched based on the explicitly listed key parameters. Only these aspects are considered for form, fit, and function compatibility.

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