BD901-S Equivalent & Substitute Parts Reference

Part Overview

The BD901-S, manufactured by Bourns Inc., is an NPN Darlington Bipolar Junction Transistor (BJT) rated for 100 V collector-emitter breakdown voltage, 8 A maximum collector current, and 2 W power dissipation in a TO-220-3 through-hole package. This device is classified as obsolete. Due to manufacturer obsolescence and inventory status, identifying substitute or equivalent transistors with comparable electrical, thermal, and mechanical characteristics is essential for maintaining existing designs and supporting effective lifecycle management.

Key Parameters

Parameter	BD901-S
Transistor Type	NPN - Darlington
Voltage - Collector Emitter Breakdown (Max)	100 V
Current - Collector (Ic) (Max)	8 A
Vce Saturation (Max) @ Ib, Ic	2.5V @ 12mA, 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 BD901-S are grouped based on direct matching of electrical and mechanical parameters, including:

Transistor Type (NPN - Darlington)
Collector-Emitter Breakdown Voltage (100 V)
Maximum Collector Current (8 A or higher)
DC Current Gain (minimum 750 or 1000 as specified)
Vce Saturation at referenced Ib, Ic values
Power Dissipation
Operating Temperature Range
Mounting Type and Package (TO-220-3 or equivalent)
RoHS and Regulatory Status

Only parts that align with these declared specifications are shown as direct equivalents or alternatives.

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
BD901-S	Bourns Inc.	NPN - Darlington	100 V	8 A	2.5V @ 12mA, 3A	500µA	750 @ 3A, 3V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Obsolete
BDX53C	onsemi	NPN - Darlington	100 V	8 A	2V @ 12mA, 3A	500µA	750 @ 3A, 3V	60 W	150°C (TJ)	Through Hole	TO-220-3	-	Obsolete
BDX53CG	onsemi	NPN - Darlington	100 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
TIP132	STMicroelectronics	NPN - Darlington	100 V	8 A	4V @ 30mA, 6A	500µA	1000 @ 4A, 4V	2 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
2N6045G	onsemi	NPN - Darlington	100 V	8 A	2V @ 12mA, 3A	20µA	1000 @ 3A, 4V	75 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
BDX33C	Fairchild Semiconductor	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	onsemi	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
TIP102	STMicroelectronics	NPN - Darlington	100 V	8 A	2.5V @ 80mA, 8A	50µA	1000 @ 3A, 4V	2 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
TIP102G	onsemi	NPN - Darlington	100 V	8 A	2.5V @ 80mA, 8A	50µA	1000 @ 3A, 4V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
TIP122G	onsemi	NPN - Darlington	100 V	5 A	4V @ 20mA, 5A	500µA	1000 @ 3A, 3V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active

Engineering Selection Recommendations

Selection of BD901-S substitutes should be based on matching product status and compliance parameters. Active substitute parts such as BDX53CG, TIP132, 2N6045G, BDX33C, BDX33CG, TIP102, TIP102G, and TIP122G are ROHS3 compliant and support through-hole mounting in TO-220-3 or directly compatible packages. Parts with obsolete status (e.g., BDX53C) may be considered only where supply chain constraints are managed, and active alternatives are prioritized.

Frequently Asked Questions (FAQ)

Q1: What requirements must a substitute for BD901-S meet?
A1: Substitute devices must match the NPN Darlington structure, a maximum collector-emitter voltage of 100 V, collector current rating of at least 8 A, comparable current gain, power dissipation, and TO-220-3 package with through-hole mounting.

Q2: Can a device with higher current or power rating be used as a substitute?
A2: Devices with equal or higher current and power ratings that match other key parameters (including voltage, gain, and package) are included as valid substitutes.

Q3: Is package compatibility required for substitution?
A3: The substitute must be in a TO-220-3 or equivalent through-hole package to ensure full mechanical compatibility with the PCB and heatsink assemblies designed for BD901-S.

Q4: Are all listed substitutes RoHS3 compliant?
A4: All listed substitutes explicitly marked as “ROHS3 Compliant” in the data meet this compliance status.

Q5: Why are “Active” status parts preferred as substitutes?
A5: Parts with “Active” product status are preferred to ensure ongoing availability and supply chain continuity, reducing the risk associated with obsolete sources.

Q6: Are there differences in “Vce Saturation” and “DC Gain” values among substitutes?
A6: Detailed comparison in the parameter table highlights the minimum Vce(sat) and gain as provided in each substituting part's documentation. Only direct matches to declared parameters are included.

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