Equivalent & Substitute Parts for BDX33A-S

Part Overview

BDX33A-S is a bipolar NPN Darlington transistor with a voltage rating of 60 V, collector current up to 10 A, and is supplied in the TO-220-3 package. The part is classified as obsolete. For ongoing manufacturing and maintenance, it becomes necessary to identify equivalent or substitute models that meet the required electrical and mechanical parameters, especially given its discontinued status.

Key Parameters

Parameter	Value
Transistor Type	NPN - Darlington
Voltage - Collector Emitter Breakdown (Max)	60 V
Current - Collector (Ic) (Max)	10 A
Vce Saturation (Max) @ Ib, Ic	2.5V @ 8mA, 4A
Current - Collector Cutoff (Max)	500µA
DC Current Gain (hFE) (Min) @ Ic, Vce	750 @ 4A, 3V
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 or exceeding the following key parameters: transistor type (NPN - Darlington), maximum collector current (10 A), voltage rating (≥60 V), Vce saturation (equal or lower at comparable current gain), DC current gain (equal or higher), collector cutoff current, maximum power dissipation, operating temperature range, mounting type, and compatible TO-220 package. Only parts that fulfill these criteria are considered equivalent or substitute.

Parameter Comparison

Part Number	Transistor Type	V_CE (Breakdown Max)	I_C (Max)	Vce Sat (Max)	Collector Cutoff (Max)	hFE (Min)	Power (Max)	Operating Temp	Mounting	Package/Case	RoHS	Status
BDX33A-S	NPN Darlington	60 V	10 A	2.5V @ 8mA, 4A	500µA	750 @ 4A, 3V	2 W	-65°C ~ 150°C	Through Hole	TO-220-3	ROHS3	Obsolete
BDX33BG	NPN Darlington	80 V	10 A	2.5V @ 6mA, 3A	500µA	750 @ 3A, 3V	70 W	-65°C ~ 150°C	Through Hole	TO-220-3	ROHS3	Active
2N6387G	NPN Darlington	60 V	10 A	3V @ 100mA, 10A	1mA	1000 @ 5A, 3V	2 W	-65°C ~ 150°C	Through Hole	TO-220-3	ROHS3	Active
BDX33C	NPN Darlington	100 V	10 A	2.5V @ 6mA, 3A	500µA	750 @ 3A, 3V	70 W	150°C	Through Hole	TO-220-3	ROHS3	Active
BDX33CG	NPN Darlington	100 V	10 A	2.5V @ 6mA, 3A	500µA	750 @ 3A, 3V	70 W	-65°C ~ 150°C	Through Hole	TO-220-3	ROHS3	Active

Engineering Selection Recommendations

BDX33A-S is obsolete, while the substitute parts BDX33BG, 2N6387G, BDX33C, and BDX33CG are each designated as active. All substitute parts listed are ROHS3 compliant. Only substitute parts with matching or superior environmental compliance and active product status are included.

Frequently Asked Questions (FAQ)

Q: What are the key criteria for substituting BDX33A-S in an application?
A: The substitute must be an NPN Darlington transistor with a collector-emitter voltage rating of at least 60 V, a collector current rating of at least 10 A, comparable or lower Vce saturation, a DC current gain no less than 750 (at relevant conditions), collector cutoff current no greater than 500µA, a compatible TO-220 package, and similar or broader operating temperature range.

Q: Are all listed substitute parts mechanically compatible with BDX33A-S?
A: All listed substitutes share the TO-220-3 package and through-hole mounting, ensuring mechanical compatibility.

Q: Does RoHS compliance differ among the substitute parts?
A: All substitute parts listed are ROHS3 compliant.

Q: Can these substitute transistors be used interchangeably in all applications?
A: Interchangeability is based strictly on matching or exceeding the specified electrical and mechanical parameters as listed. Only those substitutes meeting all listed criteria are included.

Q: Are there any differences in maximum power dissipation among the substitutes?
A: Some substitutes such as BDX33BG, BDX33C, and BDX33CG have higher maximum power dissipation (70 W) than BDX33A-S (2 W); this is reflected in the comparison table.

Q: What considerations relate to package and mounting options?
A: All listed alternatives use the TO-220-3 through-hole package, matching the mounting and mechanical fit of the original BDX33A-S.

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