TIP142T Equivalent & Substitute Parts

Part Overview

The TIP142T is an NPN 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. The device is classified as obsolete, indicating discontinuation from the original manufacturer. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Current - Collector (Ic) (Max)	10	A
Voltage - Collector Emitter Breakdown (Max)	100	V
Vce Saturation (Max) @ Ib, Ic	3V @ 40mA, 10A	—
Current - Collector Cutoff (Max)	2	mA
DC Current Gain (hFE) (Min) @ Ic, Vce	1000 @ 5A, 4V	—
Power - Max	80	W
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the TIP142T is determined by electrical and mechanical compatibility across the following critical parameters: transistor type (NPN - Darlington), maximum collector current (10 A), collector-emitter breakdown voltage (100 V), DC current gain characteristics, and through-hole mounting configuration. Substitute parts must maintain functional equivalence within the specified electrical ratings and physical form factor constraints.

The substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents with Package Variation Parts that maintain identical electrical specifications but differ in package type or thermal rating. These include TIP142G (TO-247-3 package, higher power rating) and TIP142T from STMicroelectronics (identical TO-220-3 package, same manufacturer base number).

Category 2: Functional Equivalents with Parameter Tolerance Parts that maintain core electrical specifications (10 A, 100 V) but exhibit different saturation voltage, cutoff current, and DC current gain characteristics. These include BDX33C and BDX33CG, which operate within acceptable parameter ranges for Darlington transistor applications.

Parameter Comparison

Parameter	TIP142T (onsemi)	TIP142T (STMicroelectronics)	TIP142G	BDX33C	BDX33CG
Transistor Type	NPN - Darlington	NPN - Darlington	NPN - Darlington	NPN - Darlington	NPN - Darlington
Current - Collector (Ic) (Max)	10 A	10 A	10 A	10 A	10 A
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V	100 V	100 V	100 V
Vce Saturation (Max) @ Ib, Ic	3V @ 40mA, 10A	3V @ 40mA, 10A	3V @ 40mA, 10A	2.5V @ 6mA, 3A	2.5V @ 6mA, 3A
Current - Collector Cutoff (Max)	2 mA	2 mA	2 mA	500 µA	500 µA
DC Current Gain (hFE) (Min) @ Ic, Vce	1000 @ 5A, 4V	1000 @ 5A, 4V	1000 @ 5A, 4V	750 @ 3A, 3V	750 @ 3A, 3V
Power - Max	80 W	80 W	125 W	70 W	70 W
Operating Temperature (TJ)	150°C	150°C	-65°C ~ 150°C	150°C	-65°C ~ 150°C
Package / Case	TO-220-3	TO-220-3	TO-247-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

TIP142T (STMicroelectronics) is the primary direct substitute for the obsolete onsemi TIP142T. This part maintains identical electrical specifications, package configuration (TO-220-3), and thermal characteristics while offering active product status and ROHS3 compliance. Selection of this part eliminates design modification requirements and ensures pin-for-pin compatibility.

TIP142G serves as an alternative for applications requiring enhanced thermal performance. The TO-247-3 package provides 125 W maximum power dissipation compared to 80 W for the TO-220-3 variant, with identical electrical specifications and extended operating temperature range (-65°C to 150°C). This part is suitable for designs where thermal management or temperature range expansion is beneficial. PCB layout modification is required due to package footprint differences.

BDX33C and BDX33CG are functional equivalents suitable for applications where the specified electrical parameter variations are acceptable. Both parts maintain 10 A collector current and 100 V breakdown voltage ratings. The BDX33CG variant offers extended operating temperature range (-65°C to 150°C) and ROHS3 compliance. These parts exhibit lower saturation voltage (2.5 V versus 3 V) and reduced DC current gain (750 versus 1000), which may affect circuit performance in gain-dependent applications. BDX33CG is preferred over BDX33C due to active product status and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can TIP142T (STMicroelectronics) be used as a direct replacement for TIP142T (onsemi)?

A: Yes. Both parts share identical electrical specifications, DC current gain characteristics, saturation voltage, and TO-220-3 package configuration. The STMicroelectronics variant offers active product status and ROHS3 compliance, making it the recommended direct substitute.

Q: What are the key differences between TIP142G and TIP142T?

A: The primary differences are package type and maximum power rating. TIP142G uses TO-247-3 package with 125 W maximum power dissipation, while TIP142T uses TO-220-3 package with 80 W maximum power dissipation. Electrical specifications and DC current gain are identical. TIP142G also provides extended operating temperature range (-65°C to 150°C).

Q: Are BDX33C and BDX33CG suitable replacements for TIP142T?

A: BDX33C and BDX33CG are functional equivalents that maintain core electrical ratings (10 A, 100 V). However, they exhibit different saturation voltage (2.5 V versus 3 V) and lower DC current gain (750 versus 1000). These differences may affect circuit performance in applications sensitive to gain or saturation characteristics. BDX33CG is preferred due to extended temperature range and active product status.

Q: What is the significance of the TO-247-3 package used in TIP142G?

A: The TO-247-3 package provides larger thermal mass and improved heat dissipation compared to TO-220-3. This enables higher maximum power dissipation (125 W versus 80 W) and is suitable for high-power applications. PCB layout and mounting hardware modifications are required for package conversion.

Q: Does package type affect electrical performance?

A: Package type does not alter electrical specifications or performance characteristics. Package selection is determined by thermal requirements, PCB space constraints, and mechanical mounting considerations. All listed substitutes maintain electrical equivalence within their respective package types.

Q: What compliance certifications should be considered for new designs?

A: ROHS3 compliance and REACH status are relevant for applications subject to environmental regulations. TIP142T (STMicroelectronics), TIP142G, and BDX33CG all meet ROHS3 compliance requirements. The original onsemi TIP142T does not specify RoHS status. For new designs, ROHS3-compliant variants are recommended.

Q: Can BDX33CG replace BDX33C in existing designs?

A: Yes. BDX33CG is functionally equivalent to BDX33C with identical electrical specifications and package configuration. BDX33CG offers extended operating temperature range (-65°C to 150°C) and active product status, making it the preferred variant for both new and replacement applications.

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