BDX34CG Equivalent & Substitute Parts

Part Overview

The BDX34CG is a PNP Darlington bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 10 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 ongoing design requirements and production continuity. Equivalent parts maintain identical electrical specifications, while substitute parts provide functional alternatives with modified performance characteristics within acceptable application parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP - Darlington	—
Collector Current (Max)	10	A
Collector-Emitter Breakdown Voltage (Max)	100	V
Power Dissipation (Max)	70	W
Vce Saturation (Max)	2.5	V @ 6mA, 3A
DC Current Gain (hFE Min)	750	@ 3A, 3V
Operating Temperature Range	-65 to 150	°C
Package Type	TO-220-3	Through Hole
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BDX34CG is determined by the following critical electrical and mechanical parameters: transistor type (PNP - Darlington), collector-emitter breakdown voltage (100 V), package type (TO-220-3 through-hole), and functional current/power ratings. Parts are grouped into two categories:

Direct Equivalents maintain identical maximum collector current (10 A) and power dissipation (70 W) specifications with matching Vce saturation and DC current gain characteristics. These parts are pin-compatible and electrically interchangeable.

Functional Substitutes operate within the same voltage class (100 V) and package form factor but feature modified current ratings (5 A to 12 A) and power dissipation (2 W to 80 W). These parts are suitable for applications where the specified current or power requirements differ from the original design, provided the application circuit accommodates the modified electrical characteristics.

All substitute relationships are constrained to components sharing the TO-220-3 package, PNP Darlington topology, and 100 V breakdown voltage rating.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) [A]	Vce Breakdown (Max) [V]	Power (Max) [W]	Vce Sat (Max) [V]	hFE (Min)	Operating Temp [°C]	Package
BDX34CG	onsemi	Obsolete	10	100	70	2.5	750	-65 to 150	TO-220-3
BDX34C	STMicroelectronics	Active	10	100	70	2.5	750	-65 to 150	TO-220-3
TIP147T	STMicroelectronics	Active	10	100	90	3.0	1000	-65 to 150	TO-220-3
BDW94C	STMicroelectronics	Active	12	100	80	3.0	750	-65 to 150	TO-220-3
BDX54C	STMicroelectronics	Active	8	100	60	2.0	750	-65 to 150	TO-220-3
TIP127G	onsemi	Active	5	100	2	4.0	1000	-65 to 150	TO-220-3

Engineering Selection Recommendations

Direct Equivalent Selection:

BDX34C (STMicroelectronics) is the primary direct equivalent to BDX34CG. This part maintains identical electrical specifications across all critical parameters: 10 A maximum collector current, 70 W power dissipation, 2.5 V Vce saturation, and 750 hFE minimum. The part is currently in active production status with substantial inventory availability (21,370 units). Both the original BDX34CG and BDX34C share the same base product number (BDX34), confirming direct equivalence. RoHS3 compliance and REACH unaffected status are maintained.

Enhanced Equivalent Selection:

TIP147T (STMicroelectronics) provides direct pin compatibility with improved electrical performance. While maintaining the 10 A collector current and 100 V breakdown voltage, this part offers increased power dissipation (90 W versus 70 W), higher DC current gain (1000 versus 750), and improved Vce saturation characteristics (3.0 V at 40 mA, 10 A versus 2.5 V at 6 mA, 3 A). This part is suitable for applications requiring enhanced thermal margin or higher current gain. Active production status with 21,370 units in inventory.

Functional Substitute Selection:

BDW94C (STMicroelectronics) operates at elevated current ratings (12 A maximum) within the same 100 V voltage class and TO-220-3 package. This part is appropriate for applications requiring current capacity beyond the original 10 A specification. Power dissipation is rated at 80 W. Active production status with 25,770 units in inventory.

BDX54C (STMicroelectronics) provides reduced current rating (8 A maximum) with lower power dissipation (60 W) and improved Vce saturation (2.0 V). This part is suitable for lower-current applications where thermal management is less critical. Active production status with 21,570 units in inventory.

TIP127G (onsemi) operates at significantly reduced current (5 A maximum) with minimal power dissipation (2 W). This part is restricted to low-power applications and is not suitable for designs requiring the full 10 A capacity of the original BDX34CG. Active production status with 1,970 units in inventory.

All substitute parts maintain RoHS3 compliance and REACH unaffected status consistent with the original component.

Frequently Asked Questions (FAQ)

Q: Can BDX34C directly replace BDX34CG in existing designs?

A: Yes. BDX34C is a direct equivalent with identical electrical specifications and pin configuration. The part is manufactured by STMicroelectronics and maintains all critical parameters including 10 A collector current, 70 W power dissipation, and 2.5 V Vce saturation. Both parts share the same base product number (BDX34) and TO-220-3 package.

Q: What is the difference between BDX34C and TIP147T?

A: Both parts maintain 10 A collector current and 100 V breakdown voltage with TO-220-3 packaging. TIP147T offers enhanced performance with 90 W power dissipation (versus 70 W), higher DC current gain (1000 versus 750), and different Vce saturation characteristics. TIP147T is suitable for applications requiring improved thermal performance or higher current gain.

Q: Can BDW94C be used in place of BDX34CG?

A: BDW94C is a functional substitute with higher current rating (12 A versus 10 A) and increased power dissipation (80 W versus 70 W). The part maintains 100 V breakdown voltage and TO-220-3 packaging. Substitution is valid for applications where the elevated current capacity does not create circuit design conflicts. Verify that the application circuit can accommodate the modified Vce saturation (3.0 V versus 2.5 V).

Q: Is TIP127G suitable as a substitute for BDX34CG?

A: TIP127G is not suitable for applications requiring the full 10 A capacity of BDX34CG. This part is rated for 5 A maximum collector current with minimal power dissipation (2 W). TIP127G is restricted to low-power applications and represents a significant downgrade in current handling capability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All equivalent and substitute parts listed maintain RoHS3 compliance and REACH unaffected status consistent with the original BDX34CG component.

Q: What is the operating temperature range for substitute parts?

A: BDX34C, TIP147T, BDW94C, and BDX54C all operate across the full temperature range of -65°C to 150°C (TJ), matching the original BDX34CG. TIP127G does not specify a minimum operating temperature in the provided data.

Q: Which substitute part has the best inventory availability?

A: BDW94C has the highest inventory availability with 25,770 units in stock. BDX34C and TIP147T each have 21,370 units available. BDX54C has 21,570 units. TIP127G has the lowest availability with 1,970 units.

Q: Can substitute parts with different current ratings be used interchangeably?

A: No. Parts with different maximum collector current ratings (BDX54C at 8 A, BDW94C at 12 A, TIP127G at 5 A) are not interchangeable with BDX34CG (10 A). Selection must be based on the specific current requirements of the application circuit. Using a part with insufficient current rating may cause circuit malfunction or component failure. Using a part with excessive current rating may create design conflicts if the application circuit is optimized for the original 10 A specification.

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