Equivalent & Substitute Parts Reference for BD650-S

Part Overview

The BD650-S (Bourns Inc.) is a PNP Darlington bipolar transistor in the Transistors, Bipolar (BJT) category. Core specifications include a 100 V collector-emitter breakdown voltage, 8 A collector current, 2 W maximum power rating, TO-220 through-hole package, and RoHS3 compliance. The product status is Obsolete, thus necessitating identification of substitute or equivalent models for new designs, repairs, or ongoing procurement of compatible components.

Key Parameters

Parameter	BD650-S Value	Unit
Transistor Type	PNP - Darlington	-
Voltage - Collector Emitter Breakdown (Max)	100	V
Current - Collector (Ic) (Max)	8	A
Vce Saturation (Max) @ Ib, Ic	2.5V @ 50mA, 5A	V
Current - Collector Cutoff (Max)	500	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	750 @ 3A, 3V	-
Power - Max	2	W
Operating Temperature	-65°C ~ 150°C (TJ)	°C
Mounting Type	Through Hole	-
Package / Case	TO-220-3	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution is strictly based on matching relevant electrical and mechanical parameters: PNP Darlington configuration, collector-emitter breakdown voltage (≥100 V), maximum collector current (≥8 A), DC current gain (hFE), collector cutoff current, similar or compatible Vce saturation values, maximum power rating, equivalent TO-220 package, through-hole mounting, RoHS compliance, and identical or broader operating temperature range. Substitute parts are grouped only when these critical parameters align with the main part.

Parameter Comparison

Parameter	BD650-S	BDX54C	BDX34C	TIP107	TIP107G	TIP137
Transistor Type	PNP - Darlington	PNP - Darlington	PNP - Darlington	PNP - Darlington	PNP - Darlington	PNP - Darlington
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V	100 V	100 V	100 V	100 V
Current - Collector (Ic) (Max)	8 A	8 A	10 A	8 A	8 A	8 A
Vce Saturation (Max) @ Ib, Ic	2.5V @ 50mA, 5A	2V @ 12mA, 3A	2.5V @ 6mA, 3A	2.5V @ 80mA, 8A	2.5V @ 80mA, 8A	4V @ 30mA, 6A
Current - Collector Cutoff (Max)	500µA	500µA	500µA	50µA	50µA	500µA
DC Current Gain (hFE) (Min) @ Ic, Vce	750 @ 3A, 3V	750 @ 3A, 3V	750 @ 3A, 3V	1000 @ 3A, 4V	1000 @ 3A, 4V	1000 @ 4A, 4V
Power - Max	2 W	60 W	70 W	2 W	2 W	2 W
Operating Temperature	-65°C ~ 150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	-65°C ~ 150°C (TJ)	150°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Applicable	1 (Unlimited)

Engineering Selection Recommendations

The BD650-S bipolar transistor is designated obsolete. All listed substitutes (BDX54C, BDX34C, TIP107, TIP107G, TIP137) are compliant with ROHS3 and maintain a moisture sensitivity level of 1 (Unlimited) or Not Applicable, ensuring suitability for replacement in similar environmental and regulatory profiles. Substitute parts are current production status and available in TO-220-3 through-hole packaging, supporting direct compatibility with PCB designs accommodating the original part footprint.

Frequently Asked Questions (FAQ)

Q1: What criteria must be matched when substituting the BD650-S?
A1: Substitution requires matching transistor polarity, Darlington configuration, maximum voltage and current ratings, hFE, cutoff current, package type (TO-220-3), mounting method (through hole), RoHS compliance, and operating temperature range.

Q2: Are the substitute transistors physically compatible with designs that used BD650-S?
A2: All substitutes utilize TO-220-3 through-hole packaging, enabling direct replacement in layouts designed for BD650-S.

Q3: Do all substitute parts meet environmental and compliance requirements?
A3: All listed alternatives are RoHS3 compliant and meet or exceed the original part's moisture sensitivity (MSL 1 or Not Applicable).

Q4: Are substitute models suitable for same electrical stress conditions?
A4: Each substitute matches or exceeds the voltage, current, and gain parameters required for BD650-S, with some models offering higher power ratings.

Q5: Is operating temperature range consistent among substitutes?
A5: Operating temperature ratings for all substitutes meet or exceed the original specification required for BD650-S.

Q6: Can these substitute BJTs be mixed across manufacturers for the same foot-print?
A6: Yes, provided all other specified electrical and compliance criteria are matched, as all parts use TO-220-3 through-hole form factor.

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