BD902-S Equivalent & Substitute Parts Reference

Part Overview

The BD902-S, manufactured by Bourns Inc., is a PNP Darlington bipolar junction transistor (BJT) rated for 100 V collector-emitter voltage and 8 A collector current, with a through-hole TO-220 package. Its power dissipation is specified at 2 W. This device is classified as obsolete, necessitating the selection of substitute or equivalent parts for ongoing or new applications requiring continued procurement and long-term support.

Key Parameters

Parameter	Value
Transistor Type	PNP - 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 or cross-compatible transistors are identified strictly through matching or exceeding the following key parameters: PNP Darlington transistor structure, voltage collector-emitter breakdown (100 V), maximum collector current (≥ 8 A for direct, otherwise close values), Vce saturation at specified test conditions, cutoff current, DC current gain at the same or stricter test point, power dissipation, through hole mounting, TO-220 package, RoHS compliance, and validated temperature ratings.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Transistor Type	Vce (Max)	Ic (Max)	Vce(sat) (Max) @ Ib, Ic	Ices (Max)	hFE (Min) @ Ic, Vce	Power (Max)	Operating Temperature	Mounting Type	Package / Case	RoHS Status	Product Status
BD902-S	Bourns Inc.	PNP - 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
BDX54C	STMicroelectronics	PNP - Darlington	100 V	8 A	2V @ 12mA, 3A	500µA	750 @ 3A, 3V	60 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
BDX34C	STMicroelectronics	PNP - 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
TIP107	STMicroelectronics	PNP - 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
TIP107G	onsemi	PNP - 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
TIP127G	onsemi	PNP - 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
TIP137	STMicroelectronics	PNP - 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

Engineering Selection Recommendations

Selection of BD902-S substitute parts in the transistors, bipolar (BJT) category is based on the product status and compliance certifications as provided. The main part, BD902-S, is obsolete; all listed substitute BJT models are active and RoHS3 compliant, supporting continued procurement. RoHS3 compliance and unspecified/1 (unlimited) MSL are consistent across all parts, supporting comparable environmental and handling requirements. Choose substitute parts according to required inventory and preferred manufacturer, as all substitutes meet provided regulatory and compliance criteria.

Frequently Asked Questions (FAQ)

Q1: What are the mandatory criteria for substituting the BD902-S transistor?
A1: Substitute parts must match the following parameters: PNP Darlington configuration, 100 V collector-emitter breakdown voltage, 8 A collector current (or near), compatible Vce(sat) and current gain at similar test conditions, 2 W or higher power rating, through-hole TO-220 package, and RoHS compliance.

Q2: Can a device with higher current or power rating be used as a drop-in substitute?
A2: Yes, devices such as BDX34C with higher collector current (10 A) and higher power rating can be used if all primary parameters are otherwise matched.

Q3: Is the package specification critical for compatibility?
A3: Yes, the substitute transistor must have the TO-220-3 case and through-hole mounting to maintain mechanical and footprint compatibility.

Q4: Are all substitute parts listed RoHS3 compliant?
A4: Yes, all listed equivalent and substitute BJTs are RoHS3 compliant as specified.

Q5: Does the obsolete status of BD902-S affect long-term sourcing?
A5: Yes, the obsolete status directs the selection of active substitute parts to ensure continued availability and supply chain reliability.

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