Equivalent & Substitute Parts for BDX54A-S

Part Overview

BDX54A-S is a PNP Darlington bipolar junction transistor (BJT) manufactured by Bourns Inc., offered in the TO-220 through-hole package. Key specifications include a maximum collector-emitter voltage of 60 V, collector current up to 8 A, and a collector cutoff current of 500 µA. As this component is designated "Obsolete," sourcing active or available substitute parts with matching electrical and mechanical characteristics within the same product category is necessary for continuity in design, service, or repair.

Key Parameters

Parameter	BDX54A-S Value
Transistor Type	PNP - Darlington
Current - Collector (Ic) (Max)	8 A
Voltage - Collector Emitter Breakdown (Max)	60 V
Vce Saturation (Max) @ Ib, Ic	2V @ 12mA, 3A
Current - Collector Cutoff (Max)	500µA
DC Current Gain (hFE) (Min) @ Ic, Vce	750 @ 3A, 3V
Power - Max	2 W
Mounting Type	Through Hole
Package / Case	TO-220-3
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution is based strictly on matching electrical parameters (transistor type, collector current, collector-emitter voltage breakdown, collector cutoff current, DC current gain), mechanical parameters (mounting type, package/case), and compliance information (RoHS status, temperature range). Only substitute parts adhering to these explicit specifications are included. Substitution logic uses the values for:

Transistor Type: PNP - Darlington
Collector Current (Ic)
Collector-Emitter Breakdown Voltage (Vce)
Collector Cutoff Current (Ico)
DC Current Gain (hFE)
Mounting Type and Package
Operating Temperature Range
RoHS Status

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Ic (Max)	Vce (Breakdown) (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
BDX54A-S	Bourns Inc.	PNP - Darlington	8 A	60 V	2V @ 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	8 A	100 V	2V @ 12mA, 3A	500µA	750 @ 3A, 3V	60 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Active
TIP105	NTE Electronics, Inc	PNP - Darlington	8 A	60 V	2.5V @ 80mA, 8A	50µA	1000 @ 3A, 4V	80 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	RoHS non-compliant	Active
TIP125	NTE Electronics, Inc	PNP - Darlington	-	60 V	4V @ 20mA, 5A	500µA	1000 @ 3A, 3V	-	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	RoHS non-compliant	Active

Engineering Selection Recommendations

Substitute selection for BDX54A-S must be based on continued product availability and compliance attributes. BDX54C, TIP105, and TIP125 offer active product status, with all necessary PNP Darlington electrical parameters and TO-220-3 through-hole mechanical compatibility. RoHS compliance must be considered: BDX54C matches the original part’s ROHS3 Compliant status, while TIP105 and TIP125 are designated RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q1: What technical parameters are mandatory to consider for BDX54A-S substitutes?
Electrical parameters including transistor type, maximum collector current, collector-emitter breakdown voltage, collector cutoff current, DC current gain, and Vce saturation values must match. Mechanical compatibility (package/case and mounting type) is also required.

Q2: Are there differences in package or mounting between BDX54A-S and its substitutes?
All listed substitutes are provided in the TO-220-3 package and are suitable for through-hole mounting, ensuring direct mechanical interchangeability.

Q3: How does product status affect substitute selection?
BDX54A-S is obsolete. Substitute selection should prioritize parts with active product status for ongoing availability in design and repairs.

Q4: Is RoHS compliance uniform among the substitutes?
BDX54C is ROHS3 Compliant, aligning with BDX54A-S; TIP105 and TIP125 are RoHS non-compliant. Selection should adhere to mandated environmental compliance requirements in the target application.

Q5: What are the compatibility considerations for electrical performance?
All candidate parts are PNP Darlington transistors with collector current and voltage breakdown ratings that match or exceed BDX54A-S parameters. Ensure selected substitutes conform strictly to the required electrical ratings specified in the parameter comparison.

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