BDX53C Equivalent & Substitute Parts

Part Overview

The BDX53C is an NPN Darlington bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 8 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. The BDX53C serves applications requiring moderate-current NPN switching and amplification with integrated Darlington configuration for high current gain.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - 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)	500	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	750 @ 3A, 3V	—
Power - Max	60	W
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the BDX53C is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN - Darlington configuration
Voltage - Collector Emitter Breakdown: minimum 100 V
Current - Collector (Ic) (Max): minimum 8 A
Package / Case: TO-220-3 form factor
Mounting Type: Through Hole

Secondary Compatibility Factors:

Vce Saturation characteristics
DC Current Gain (hFE) specifications
Power dissipation rating
Operating temperature range

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical or superior electrical ratings and active product status, suitable for direct replacement without circuit modification.

Functional Alternatives: Parts with modified electrical parameters (higher current capability, different voltage ratings, or enhanced power handling) that maintain core functionality within the same package family but require application-specific validation.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [A]	Vce Breakdown (Max) [V]	Vce Sat @ Ib, Ic	hFE (Min) @ Ic, Vce	Power (Max) [W]	Temp (TJ) [°C]	Package	Status
BDX53C	onsemi	8	100	2V @ 12mA, 3A	750 @ 3A, 3V	60	150	TO-220-3	Obsolete
BDX53CG	onsemi	8	100	2V @ 12mA, 3A	750 @ 3A, 3V	65	-65 to 150	TO-220-3	Active
2N6045G	onsemi	8	100	2V @ 12mA, 3A	1000 @ 3A, 4V	75	-65 to 150	TO-220-3	Active
BDX33CG	onsemi	10	100	2.5V @ 6mA, 3A	750 @ 3A, 3V	70	-65 to 150	TO-220-3	Active
BDX53BG	onsemi	8	80	2V @ 12mA, 3A	750 @ 3A, 3V	65	-65 to 150	TO-220-3	Active
TIP102G	onsemi	8	100	2.5V @ 80mA, 8A	1000 @ 3A, 4V	2	-65 to 150	TO-220-3	Active
TIP122G	onsemi	5	100	4V @ 20mA, 5A	1000 @ 3A, 3V	2	-65 to 150	TO-220-3	Active
TIP132	STMicroelectronics	8	100	4V @ 30mA, 6A	1000 @ 4A, 4V	2	150	TO-220-3	Active
BDX33C	Fairchild Semiconductor	10	100	2.5V @ 6mA, 3A	750 @ 3A, 3V	70	150	TO-220-3	Active
BDX53B	STMicroelectronics	8	80	2V @ 12mA, 3A	750 @ 3A, 3V	60	150	TO-220-3	Active

Engineering Selection Recommendations

Direct Replacement (Preferred):

BDX53CG is the primary direct equivalent to BDX53C. Both devices share identical electrical specifications (8 A collector current, 100 V breakdown voltage, 750 hFE minimum, 2 V saturation voltage). BDX53CG is manufactured by onsemi with active product status and RoHS3 compliance, making it suitable for immediate substitution in existing designs. The extended operating temperature range (-65°C to 150°C) provides improved thermal margin compared to the obsolete BDX53C.

Alternative Selections Based on Application Requirements:

2N6045G offers enhanced DC current gain (1000 hFE minimum) and increased power rating (75 W) while maintaining 8 A collector current and 100 V breakdown voltage. This part is suitable for applications requiring improved switching speed or reduced base drive requirements.

BDX33CG and BDX33C provide higher collector current capability (10 A maximum) with 100 V breakdown voltage and 70 W power rating. These parts are appropriate for applications requiring current margin above 8 A within the same voltage class.

BDX53BG and BDX53B are suitable only for applications where 80 V collector-emitter breakdown voltage is acceptable. These parts maintain 8 A current rating and are not recommended as primary substitutes for 100 V rated designs.

TIP102G and TIP132 are not recommended as direct replacements due to significantly reduced power dissipation ratings (2 W versus 60 W), despite matching voltage and current specifications. These parts are suitable only for low-power signal applications.

TIP122G is not recommended due to reduced maximum collector current (5 A versus 8 A) and low power rating (2 W).

Compliance Considerations:

All recommended active substitutes carry RoHS3 compliance certification. BDX33C (Fairchild Semiconductor) carries REACH Affected status, requiring verification against specific supply chain requirements. All onsemi alternatives maintain REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can BDX53CG be used as a direct replacement for BDX53C in all applications?

A: Yes. BDX53CG maintains identical electrical specifications to BDX53C (8 A, 100 V, 750 hFE, 2 V saturation) and is housed in the same TO-220-3 package. The extended operating temperature range of BDX53CG (-65°C to 150°C) provides additional thermal margin. No circuit modifications are required.

Q: What is the difference between BDX53CG and 2N6045G?

A: Both parts support 8 A collector current and 100 V breakdown voltage in TO-220-3 packages. 2N6045G provides higher DC current gain (1000 hFE minimum versus 750) and increased power rating (75 W versus 65 W). The choice depends on whether enhanced gain or power handling is required for the specific application.

Q: Why is BDX53BG not recommended as a substitute?

A: BDX53BG has a reduced collector-emitter breakdown voltage rating of 80 V compared to the BDX53C specification of 100 V. This part is suitable only for applications designed for 80 V operation and should not be used in circuits requiring 100 V rated components.

Q: Can TIP122G replace BDX53C?

A: TIP122G is not suitable as a direct replacement. While both are NPN Darlington transistors in TO-220-3 packages, TIP122G has a maximum collector current of 5 A (versus 8 A) and a power rating of 2 W (versus 60 W). TIP122G is designed for low-power signal applications and cannot handle the current and power requirements of BDX53C applications.

Q: What is the significance of the power rating difference between BDX53C (60 W) and TIP102G (2 W)?

A: Power rating indicates the maximum heat dissipation capability of the device. BDX53C is designed for high-power switching applications requiring sustained current delivery with moderate heat generation. TIP102G, despite matching voltage and current specifications, is optimized for low-power signal switching where minimal heat dissipation occurs. Substituting TIP102G in a 60 W application would result in thermal failure.

Q: Are there packaging differences between substitute parts?

A: All recommended substitutes use the TO-220-3 through-hole package form factor, ensuring mechanical compatibility with existing PCB layouts. Supplier device package designations (TO-220 versus TO-220-3) refer to internal packaging for distribution and do not affect board-level compatibility.

Q: Which substitute offers the best performance upgrade from BDX53C?

A: 2N6045G provides the most comprehensive performance improvement, offering higher DC current gain (1000 versus 750), increased power rating (75 W versus 60 W), and extended operating temperature range (-65°C to 150°C), while maintaining identical voltage and current specifications. This part is suitable for designs requiring improved switching characteristics or thermal margin.

Q: Is RoHS3 compliance important for substitute selection?

A: RoHS3 compliance is required for applications subject to European Union Restriction of Hazardous Substances regulations. All recommended onsemi substitutes (BDX53CG, 2N6045G, BDX33CG, BDX53BG, TIP102G, TIP122G) carry RoHS3 certification. BDX33C (Fairchild Semiconductor) and BDX53B (STMicroelectronics) also carry RoHS3 compliance.

Q: What does "Obsolete" product status mean for BDX53C?

A: Obsolete status indicates that onsemi has discontinued manufacturing and support for BDX53C. Existing inventory may be available from distributors, but long-term supply cannot be guaranteed. Active equivalent parts such as BDX53CG should be selected for new designs and production planning to ensure supply continuity.

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