BDX53A-S Equivalent & Substitute Parts Reference

Part Overview

The BDX53A-S, manufactured by Bourns Inc., is an NPN Darlington Bipolar Junction Transistor (BJT) with a collector-emitter breakdown voltage of 60 V, collector current of 8 A, and power dissipation of 2 W, housed in a TO-220 through-hole package. The device is compliant with RoHS3 standards and is listed as obsolete. Due to its obsolescence, it is necessary to identify compatible equivalent or substitute models for applications requiring direct replacement in electronic designs, maintenance, or manufacturing.

Key Parameters

Parameter	Value
Transistor Type	NPN - Darlington
Voltage - Collector Emitter Breakdown (Max)	60 V
Current - Collector (Ic) (Max)	8 A
Vce Saturation (Max) @ Ib, Ic	2V @ 12mA, 3A
Current - Collector Cutoff (Max)	500µA
DC Current Gain (hFE) (Min) @ Ic, Vce	750 @ 3A, 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 for BDX53A-S is strictly determined by the following key parameters:

Transistor Type: NPN - Darlington
Voltage - Collector Emitter Breakdown (Min 60 V)
Maximum Collector Current (8 A)
Power Dissipation (≥2 W)
Package, Mounting Type: TO-220-3, Through Hole

Only substitute parts matching or exceeding these criteria are listed as equivalents. Substitute parts may exhibit higher voltage or power ratings but must comply with the NPN Darlington configuration and physical mounting requirements.

Parameter Comparison

Part Number	Transistor Type	Vce Breakdown (Max)	Collector Current (Ic Max)	Vce Saturation (Max) @ Ib, Ic	Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power Max	Operating Temp	Mounting Type	Package / Case	RoHS Status
BDX53A-S	NPN - Darlington	60 V	8 A	2V @ 12mA, 3A	500µA	750 @ 3A, 3V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3
2N6043G	NPN - Darlington	60 V	8 A	2V @ 16mA, 4A	20µA	1000 @ 4A, 4V	75 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3
BDX53B	NPN - Darlington	80 V	8 A	2V @ 12mA, 3A	500µA	750 @ 3A, 3V	60 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3
BDX53BG	NPN - Darlington	80 V	8 A	2V @ 12mA, 3A	500µA	750 @ 3A, 3V	65 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3
BDX53C	NPN - Darlington	100 V	8 A	2V @ 12mA, 3A	500µA	750 @ 3A, 3V	60 W	150°C (TJ)	Through Hole	TO-220-3
BDX53CG	NPN - Darlington	100 V	8 A	2V @ 12mA, 3A	500µA	750 @ 3A, 3V	65 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3
TIP120	NPN - Darlington	60 V	5 A	4V @ 20mA, 5A	500µA	1000 @ 3A, 3V	2 W	150°C (TJ)	Through Hole	TO-220-3
TIP120G	NPN - Darlington	60 V	5 A	4V @ 20mA, 5A	500µA	1000 @ 3A, 3V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3

Engineering Selection Recommendations

For replacement of the BDX53A-S, select substitute parts that match the RoHS3 compliance status and ensure unlimited or not applicable Moisture Sensitivity Level (MSL) as required for manufacturing processes. If specific certifications are mandated by the application, prefer substitute part numbers with explicit RoHS3 compliance provided in the comparison. For applications sensitive to product status, prioritize active parts listed. Obsolete substitutes should be reserved for short-term replacement or legacy repairs.

Frequently Asked Questions (FAQ)

Q: What parameters determine if a BJT is a direct substitute for BDX53A-S?
A: Required parameters are transistor type (NPN - Darlington), collector-emitter breakdown voltage of at least 60 V, maximum collector current of at least 8 A, similar or higher DC current gain, and the same or higher power dissipation. Physical compatibility (TO-220-3 case, through-hole mounting) is also critical.

Q: Does RoHS3 compliance differ between the main part and equivalents?
A: Most substitute parts provide RoHS3 compliance. Specific parts without explicit RoHS status in the table should be verified by reviewing supplier data sheets.

Q: Is a higher voltage or power rating acceptable for substitutes?
A: Yes, higher ratings for breakdown voltage and power are acceptable as long as other required operating characteristics and package type are met.

Q: Are all listed substitutes suitable for all mounting configurations?
A: All substitutes use the TO-220-3 through-hole package, which matches the main part’s mounting and ensures mechanical compatibility.

Q: Should product status influence part selection?
A: For ongoing production, prioritize active status parts. Obsolete substitutes are only suitable for maintenance or repair where continued supply is not required.

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