Equivalent & Substitute Parts Reference: BDX33B-S

Part Overview

The BDX33B-S (Bourns Inc.) is an NPN Darlington bipolar junction transistor rated for 80 V collector-emitter breakdown voltage and 10 A maximum collector current, housed in a TO-220 through-hole package. With a minimum DC current gain of 750 @ 3A, 3V and a maximum power dissipation of 2 W, it is designed for medium-power switching and amplification applications. This product is marked as Obsolete, necessitating the identification of direct and similar substitute models to support ongoing designs and maintenance.

Key Parameters

Parameter	Value
Transistor Type	NPN - Darlington
Voltage - Collector Emitter Breakdown (Max)	80 V
Current - Collector (Ic) (Max)	10 A
DC Current Gain (hFE) (Min) @ Ic, Vce	750 @ 3A, 3V
Vce Saturation (Max) @ Ib, Ic	2.5V @ 6mA, 3A
Current - Collector Cutoff (Max)	10mA
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

Substitute part selection for the BDX33B-S follows matching core electrical and mechanical parameters: NPN Darlington type, collector-emitter breakdown voltage, maximum collector current, minimum DC current gain, saturation voltage, cutoff current, package type, mounting type, and compliance. Direct substitutes match all functional attributes including current and voltage ratings, package, and RoHS status. Similar substitutes maintain compatibility in voltage, package, and compliance, but may vary in collector current rating or maximum power.

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	Product Status
BDX33B-S	Bourns Inc.	NPN - Darlington	80 V	10 A	2.5V @ 6mA, 3A	10mA	750 @ 3A, 3V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Obsolete
2N6388G	onsemi	NPN - Darlington	80 V	10 A	3V @ 100mA, 10A	1mA	1000 @ 5A, 3V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
BDX33BG	onsemi	NPN - Darlington	80 V	10 A	2.5V @ 6mA, 3A	500µA	750 @ 3A, 3V	70 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
BDX53B	STMicroelectronics	NPN - Darlington	80 V	8 A	2V @ 12mA, 3A	500µA	750 @ 3A, 3V	60 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
BDX53BG	onsemi	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 Compliant	Active

Engineering Selection Recommendations

Substitute model selection for BDX33B-S should be based on active product status, ROHS3 compliance, and consistent package standards. Direct replacements such as 2N6388G and BDX33BG offer maintained supply and compliance and match all electrical and mechanical parameters. Similar substitutes BDX53B and BDX53BG provide comparable package and environmental compliance; differences in collector current rating and maximum power should be noted per the provided specification.

Frequently Asked Questions (FAQ)

Q: What key parameters must match to substitute for BDX33B-S?
A: Substitution requires equivalence in transistor type (NPN Darlington), collector-emitter breakdown voltage, collector current rating, DC current gain, package (TO-220-3), mounting type (through hole), and RoHS compliance.

Q: Are the listed substitutes drop-in replacements?
A: Direct substitutes 2N6388G and BDX33BG match all listed electrical, mechanical, and compliance attributes. Similar models BDX53B and BDX53BG differ in maximum collector current and power dissipation.

Q: Is package compatibility guaranteed across all substitutes?
A: All listed substitutes possess TO-220-3 through-hole packages and are suitable for applications requiring the same package form factor.

Q: Why is substitute identification required for BDX33B-S?
A: The BDX33B-S is obsolete; substitutes are necessary to maintain supply continuity and design compatibility.

Q: Do substitute parts meet RoHS compliance requirements?
A: All listed substitutes are ROHS3 compliant per provided information.

Q: Should power and collector current specifications be reviewed for similar substitutes?
A: Per provided parameters, similar substitutes BDX53B and BDX53BG offer reduced collector current ratings compared to the BDX33B-S. Selection must align with application requirements outlined in the input.

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