BDX54C-S Equivalent & Substitute Parts Engineering Reference

Part Overview

The BDX54C-S by Bourns Inc. is an obsolete PNP Darlington Bipolar Junction Transistor (BJT) in the TO-220 package. It features a maximum collector current of 8 A, a maximum collector-emitter voltage of 100 V, and a minimum DC current gain of 750. The device is suitable for high-current switching and amplification applications. Due to its obsolete status and lack of ongoing production, identifying suitable alternative transistors with matching electrical and mechanical parameters is necessary to maintain legacy system compatibility or facilitate repair and continued manufacturing.

Key Parameters

Parameter	Value
Transistor Type	PNP - Darlington
Current - Collector (Ic) (Max)	8 A
Voltage - Collector Emitter Breakdown (Max)	100 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
Operating Temperature	-65°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute and equivalent PNP Darlington BJT transistors are grouped strictly by matching the electrical and mechanical parameters provided. This includes: transistor polarity and type, maximum collector current (Ic), maximum collector-emitter breakdown voltage (Vce), Vce(sat) characteristics, cutoff current, minimum DC current gain (hFE), total power dissipation, operating temperature range, mounting style, and package outline. Only parts specified in the product category with these key parameters and matching compliance information (RoHS, MSL) are considered.

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Ic (Max)	Vce (Max)	Vce Saturation (Max) @ Ib, Ic	Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Operating Temperature	Mounting Type	Package / Case	RoHS Status	MSL
BDX54C-S	Bourns Inc.	PNP - Darlington	8 A	100 V	2V @ 12mA, 3A	500µA	750 @ 3A, 3V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	1 (Unlimited)
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	1 (Unlimited)
TIP107	STMicroelectronics	PNP - Darlington	8 A	100 V	2.5V @ 80mA, 8A	50µA	1000 @ 3A, 4V	2 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	1 (Unlimited)
TIP107G	onsemi	PNP - Darlington	8 A	100 V	2.5V @ 80mA, 8A	50µA	1000 @ 3A, 4V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Not Applicable
TIP127G	onsemi	PNP - Darlington	5 A	100 V	4V @ 20mA, 5A	500µA	1000 @ 3A, 3V	2 W	-65°C ~ 150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	Not Applicable
TIP137	STMicroelectronics	PNP - Darlington	8 A	100 V	4V @ 30mA, 6A	500µA	1000 @ 4A, 4V	2 W	150°C (TJ)	Through Hole	TO-220-3	ROHS3 Compliant	1 (Unlimited)

Engineering Selection Recommendations

When selecting substitutes for the BDX54C-S, verify the product status and environmental compliance of the replacement transistor. The BDX54C (STMicroelectronics), TIP107 (STMicroelectronics), TIP107G (onsemi), TIP127G (onsemi), and TIP137 (STMicroelectronics) are all listed as active and ROHS3 compliant. Consider MSL ratings and availability in the TO-220-3 through-hole package to ensure direct compatibility with existing footprints.

Frequently Asked Questions (FAQ)

Q: What parameters determine if a BJT can be substituted for the BDX54C-S?
A: Substitution is based on matching transistor type, maximum collector current, maximum collector-emitter breakdown voltage, Vce(sat), collector cutoff current, minimum DC current gain at specified Ic and Vce, power dissipation, operating temperature, mounting style, and package.

Q: Are the substitute parts physically compatible with the BDX54C-S?
A: All substitute parts are specified in the TO-220-3 through-hole package, which matches the BDX54C-S for physical mounting and footprint compatibility.

Q: Do substitute transistors maintain RoHS compliance and similar MSL rating?
A: All listed substitutes are ROHS3 compliant. MSL ratings are specified and comparable or identical.

Q: Are there differences in electrical performance among substitutes?
A: There are minor variations in Vce(sat), DC current gain, and cutoff current. These values are provided for engineering evaluation; all substitutes remain within the range of the original BDX54C-S for general PNP Darlington use as detailed in the parameters.

Q: How should I choose between multiple active substitutes?
A: Selection is based on matching parameters, product status, compliance certifications, availability, and package, as detailed in the provided comparison table.

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