Equivalent & Substitute Parts for BDX33D-S (Bourns Inc.)

Part Overview

The BDX33D-S from Bourns Inc. is an obsolete NPN Darlington bipolar junction transistor (BJT), designed for through-hole mounting in TO-220 packages. It features a maximum collector-emitter breakdown voltage of 120 V, a maximum collector current of 10 A, and a minimum DC current gain of 750 at 3A, 3V. Due to its obsolete status, engineering projects requiring maintenance, replacement, or ongoing designs may need substitutes with matching or compatible electrical and mechanical specifications.

Key Parameters

Parameter	BDX33D-S
Transistor Type	NPN - Darlington
Voltage - Collector Emitter Breakdown (Max)	120 V
Current - Collector (Ic) (Max)	10 A
Vce Saturation (Max) @ Ib, Ic	2.5V @ 6mA, 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

Substitute parts for the BDX33D-S are selected strictly based on matching transistor type, electrical characteristics (collector-emitter breakdown voltage, collector current rating, DC current gain at specified conditions, maximum collector cutoff current, Vce saturation performance), power rating, operating temperature, mounting type, and package. Only NPN Darlington transistors in TO-220-3 through-hole packages with compliant RoHS status, and similar or higher current/voltage ratings, are considered equivalent substitutes. Compliance certifications and product status are also applied as allowed parameters.

Parameter Comparison

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	Operating Temperature	Mounting Type	Package / Case	RoHS Status	Product Status
BDX33D-S	NPN - Darlington	120 V	10 A	2.5V @ 6mA, 3A	500µA	750 @ 3A, 3V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Obsolete
BDX33BG	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
BDX33C	NPN - Darlington	100 V	10 A	2.5V @ 6mA, 3A	500µA	750 @ 3A, 3V	70 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
BDX33CG	NPN - Darlington	100 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
BDW94CFTU	PNP - Darlington	100 V	12 A	3V @ 100mA, 10A	1mA	750 @ 5A, 3V	80 W	150°C (TJ)	Through Hole	TO-220-3 Full Pack	ROHS3 Compliant	Active

Engineering Selection Recommendations

The selection of substitute parts is determined by the obsolete status of BDX33D-S, RoHS compliance, and active product status of potential replacements. All listed substitute models are ROHS3 compliant. Only select substitutes sharing the same transistor type, package, and mounting configuration as BDX33D-S for direct compatibility. Substitute parts classified as "Active" are suitable based on these criteria.

Frequently Asked Questions (FAQ)

Q1: What are the critical substitution parameters for BDX33D-S?
A1: Transistor type (NPN - Darlington), voltage and current ratings, DC current gain, cutoff current, Vce saturation, package/case (TO-220-3), mounting type (Through Hole), and compliance are required for equivalent substitution.

Q2: Can the PNP Darlington BDW94CFTU be substituted for BDX33D-S?
A2: BDW94CFTU is a PNP Darlington transistor. Substitution is only valid where circuit design supports PNP in place of NPN, as this is not electrically identical to BDX33D-S’s NPN configuration.

Q3: Are all substitute parts using the same TO-220 package?
A3: All NPN substitute parts listed use through-hole TO-220-3 packages, matching mechanical compatibility with the main part.

Q4: Is RoHS compliance maintained in all substitute options?
A4: All substitute part numbers presented are ROHS3 compliant per provided data.

Q5: Does difference in collector-emitter voltage affect substitution?
A5: Substitute selection should consider voltage ratings. Parts with lower voltage ratings (e.g., BDX33BG at 80V) are acceptable only where application maximum voltage does not exceed the rating.

Q6: How does obsolete status impact sourcing and use?
A6: Obsolete status of BDX33D-S necessitates using active substitute part numbers for ongoing projects or repairs to ensure availability and regulatory compliance.

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