TIP29 Equivalent & Substitute Parts

Part Overview

The TIP29 is a Bipolar (BJT) NPN transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 1 A maximum collector current in a TO-220-3 through-hole package. The device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters while accommodating modern product availability and compliance requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	1	A
Voltage - Collector Emitter Breakdown (Max)	40	V
Vce Saturation (Max) @ Ib, Ic	700mV @ 125mA, 1A	—
Current - Collector Cutoff (Max)	300	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 1A, 4V	—
Power - Max	2	W
Frequency - Transition	3	MHz
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
Operating Temperature (Max)	150	°C (TJ)
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the TIP29 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Transistor Type: NPN
Mounting Type: Through Hole
Package / Case: TO-220-3
Current - Collector (Ic) (Max): ≥ 1 A
Voltage - Collector Emitter Breakdown (Max): ≥ 40 V
Power - Max: ≥ 2 W
RoHS Status: ROHS3 Compliant

Substitute parts must satisfy all mandatory criteria to ensure functional equivalence in existing circuit designs. Parts meeting these parameters can be directly substituted without circuit modification, provided that application-specific requirements do not impose additional constraints beyond the specified electrical ratings.

Parameter Comparison

Parameter	TIP29	TIP29CG	TIP29A
Manufacturer	onsemi	onsemi	Solid State Inc.
Product Status	Obsolete	Active	Active
Transistor Type	NPN	NPN	NPN
Current - Collector (Ic) (Max)	1 A	1 A	Not Specified
Voltage - Collector Emitter Breakdown (Max)	40 V	100 V	Not Specified
Vce Saturation (Max) @ Ib, Ic	700mV @ 125mA, 1A	700mV @ 125mA, 1A	Not Specified
Current - Collector Cutoff (Max)	300 µA	300 µA	Not Specified
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 1A, 4V	15 @ 1A, 4V	Not Specified
Power - Max	2 W	2 W	Not Specified
Frequency - Transition	3 MHz	3 MHz	Not Specified
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3
Operating Temperature (Max)	150°C (TJ)	150°C (TJ)	Not Specified
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

TIP29CG (onsemi): This part is the primary substitute for the obsolete TIP29. It maintains identical electrical characteristics including collector current, saturation voltage, current gain, and transition frequency. The TIP29CG features an elevated collector-emitter breakdown voltage of 100 V, providing enhanced voltage margin for applications originally designed for 40 V operation. The part carries Active product status and ROHS3 compliance, ensuring long-term availability and regulatory conformance. Packaging is supplied in tube format rather than bulk, accommodating standard production workflows.

TIP29A (Solid State Inc.): This part satisfies the mandatory package and mounting requirements (TO-220-3, through-hole) and maintains ROHS3 compliance. However, critical electrical parameters including collector current, voltage breakdown, saturation characteristics, current gain, and transition frequency are not specified in available documentation. Selection of TIP29A requires verification against application-specific requirements and should be undertaken only when TIP29CG availability is constrained.

Frequently Asked Questions (FAQ)

Q: Can the TIP29CG directly replace the TIP29 in existing designs?

A: Yes. The TIP29CG maintains identical electrical specifications for collector current (1 A), saturation voltage (700 mV @ 125 mA, 1 A), current gain (15 @ 1 A, 4 V), and transition frequency (3 MHz). The higher breakdown voltage (100 V versus 40 V) provides additional design margin and does not compromise compatibility. Both parts use the TO-220-3 package and through-hole mounting.

Q: What is the primary difference between TIP29 and TIP29CG?

A: The TIP29CG features a maximum collector-emitter breakdown voltage of 100 V compared to 40 V for the TIP29. All other electrical parameters remain equivalent. The TIP29CG is supplied in tube packaging, whereas the TIP29 was available in bulk. The TIP29CG carries Active product status, ensuring continued availability.

Q: Is the TIP29A a suitable substitute?

A: The TIP29A meets packaging and mounting requirements (TO-220-3, through-hole) and is ROHS3 compliant. However, critical electrical parameters are not documented. Use of TIP29A requires independent verification that its electrical characteristics satisfy application requirements. TIP29CG is the recommended substitute when available.

Q: Are there any thermal or mounting considerations when substituting these parts?

A: All three parts use identical TO-220-3 through-hole packaging and support the same 150°C maximum junction temperature. Thermal management and PCB layout considerations remain unchanged during substitution. Mounting hardware and heatsink compatibility are preserved across all three parts.

Q: What compliance certifications apply to substitute parts?

A: Both TIP29CG and TIP29A are ROHS3 compliant. TIP29CG and the original TIP29 are REACH Unaffected. TIP29A carries Vendor Undefined REACH status. All parts are classified under ECCN EAR99 for export control purposes.

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