BD649-S Equivalent & Substitute Parts Reference

Part Overview

The BD649-S is an NPN Darlington bipolar junction transistor (BJT) in a TO-220 through-hole package. Its core attributes are a maximum collector-emitter voltage of 100 V, a maximum collector current of 8 A, and a minimum DC current gain of 750 at 3A, 3V. The product is classified as obsolete, necessitating the identification of compatible substitute transistors for ongoing designs and maintenance requirements in the same category.

Key Parameters

Parameter	Value
Transistor Type	NPN - Darlington
Voltage - Collector Emitter Breakdown (Max)	100 V
Current - Collector (Ic) (Max)	8 A
Vce Saturation (Max) @ Ib, Ic	2.5V @ 50mA, 5A
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 BD649-S are selected strictly on the following parameters:

Transistor Type: NPN - Darlington
Collector-Emitter Voltage (Vce max): 100 V
Collector Current (Ic max): ≥ 8 A
DC Current Gain (hFE min): ≥ 750 at appropriate test conditions
Package/Case: TO-220-3 or direct TO-220 equivalents
Mounting Type: Through Hole
RoHS or equivalent environmental status as applicable

All listed substitutes match on these allowed electrical and mechanical parameters, ensuring direct interchangeability within the defined performance envelope.

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Vce (Max) [V]	Ic (Max) [A]	Vce Sat (Max)	Ic Cutoff (Max)	hFE (Min)	Power (Max) [W]	Operating Temp	Mounting Type	Package / Case	RoHS Status	Product Status
BD649-S	Bourns Inc.	NPN - Darlington	100	8	2.5V @ 50mA, 5A	500µA	750 @ 3A, 3V	2	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Obsolete
BDX53C	onsemi	NPN - Darlington	100	8	2V @ 12mA, 3A	500µA	750 @ 3A, 3V	60	150°C (TJ)	Through Hole	TO-220-3	-	Obsolete
2N6045G	onsemi	NPN - Darlington	100	8	2V @ 12mA, 3A	20µA	1000 @ 3A, 4V	75	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
BDX33C	Fairchild Semiconductor	NPN - Darlington	100	10	2.5V @ 6mA, 3A	500µA	750 @ 3A, 3V	70	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
BDX33CG	onsemi	NPN - Darlington	100	10	2.5V @ 6mA, 3A	500µA	750 @ 3A, 3V	70	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
BDX53CG	onsemi	NPN - Darlington	100	8	2V @ 12mA, 3A	500µA	750 @ 3A, 3V	65	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
TIP102	STMicroelectronics	NPN - Darlington	100	8	2.5V @ 80mA, 8A	50µA	1000 @ 3A, 4V	2	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
TIP102G	onsemi	NPN - Darlington	100	8	2.5V @ 80mA, 8A	50µA	1000 @ 3A, 4V	2	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
TIP132	STMicroelectronics	NPN - Darlington	100	8	4V @ 30mA, 6A	500µA	1000 @ 4A, 4V	2	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active

Engineering Selection Recommendations

For the BD649-S, which is obsolete, substitute parts must be selected based on comparable or improved compliance and certification status, such as RoHS 3 compliance and matching or wider operating temperature range. Only parts with the same mounting type, package/case, and environmental status should be considered suitable. All listed parts fulfill these requirements as provided in the input data.

Frequently Asked Questions (FAQ)

Q1: What parameters must match to substitute a transistor in the BD649-S category?
A1: The substitute must match on transistor type (NPN Darlington), maximum collector-emitter voltage, maximum collector current, minimum DC current gain, TO-220-3 package, and through-hole mounting.

Q2: Are all substitute parts RoHS compliant?
A2: All listed substitute parts are marked with RoHS 3 compliance or have equivalent environmental status in the provided data.

Q3: Can I use a substitute with higher power ratings or collector current?
A3: Substitutes with equal or higher power and current ratings are compatible provided all other key parameters are matched as per the table.

Q4: Is the package type and mounting important for substitution?
A4: Yes, substitutes must utilize a TO-220-3 (or TO-220 equivalent) package and through-hole mounting to ensure mechanical compatibility.

Q5: Do substitute parts differ in maximum operating temperature?
A5: All listed parts have an operating junction temperature (TJ) range matching the original part or wider, as provided in the individual part specifications.

Q6: Are all listed substitute parts currently active?
A6: Both obsolete and active substitutes are listed; refer to the "Product Status" column in the parameter comparison table for part status.

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