BD647-S Equivalent & Substitute Parts Reference

Part Overview

BD647-S is a Bourns Inc. NPN Darlington Bipolar Junction Transistor (BJT), rated for 80 V, 8 A with a TO-220 through-hole package. The product status is Obsolete. Engineers seeking replacement or ongoing supply must identify equivalent substitute parts with identical or superior electrical and mechanical characteristics for sustained design compatibility and manufacturing reliability.

Key Parameters

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	Supplier Device Package	RoHS Status
BD647-S	NPN - Darlington	80 V	8 A	2.5V @ 50mA, 5A	500µA	750 @ 3A, 3V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	TO-220	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for BD647-S are grouped based strictly on matching and equivalent specifications for the following parameters: transistor type (NPN - Darlington), maximum collector-emitter breakdown voltage (80 V), maximum collector current (≥8 A), DC current gain (hFE) ≥750 @ 3A, 3V, collector cutoff current (≤500µA), package/case (TO-220-3), mounting type (Through Hole), and RoHS compliance. Only parts with these attributes are listed as direct substitutes or equivalents.

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	Supplier Device Package	RoHS Status
BD647-S	Bourns Inc.	NPN - Darlington	80 V	8 A	2.5V @ 50mA, 5A	500µA	750 @ 3A, 3V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	TO-220	ROHS3 Compliant
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	TO-220	ROHS3 Compliant
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	TO-220	ROHS3 Compliant
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	TO-220	ROHS3 Compliant

Engineering Selection Recommendations

The BD647-S is listed as Obsolete. Substitute models BDX53B (STMicroelectronics), BDX53BG (onsemi), and BDX33BG (onsemi) are Active and available in RoHS3 compliant TO-220-3 through-hole packages. All substitute parts provided meet the same compliance criteria and certifications as BD647-S, ensuring continuity for designs requiring RoHS status and through-hole TO-220 mounting.

Frequently Asked Questions (FAQ)

Q: What parameters must match for a substitute to be considered for BD647-S?
A: Substitute parts must match transistor type (NPN - Darlington), maximum collector-emitter breakdown voltage (80 V), collector current (≥8 A), cutoff current (≤500µA), DC current gain (hFE) (≥750 @ 3A, 3V), package/case (TO-220-3), mounting type (Through Hole), and RoHS status.

Q: Can substitute parts with higher power ratings be used?
A: Substitute parts with higher power ratings are permitted within this category, provided all other key parameters are equivalent or superior per input data.

Q: Is the physical package important for direct replacement?
A: The direct package match (TO-220-3, Through Hole) is required for mechanical compatibility in existing PCB designs.

Q: Are all substitutes RoHS3 compliant and suitable for global supply chains?
A: All listed substitute parts are RoHS3 compliant, matching the compliance status of the BD647-S.

Q: How is product status relevant to selection?
A: Substitute parts are Active, ensuring ongoing availability, whereas BD647-S is Obsolete. This supports sustained manufacturing and supply.

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