TIP29CTSTU Equivalent & Substitute Parts

Part Overview

The TIP29CTSTU is an NPN bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 1 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The TIP29CTSTU serves in general-purpose switching and amplification applications where moderate voltage and current handling are required.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	100 V
Current - Collector (Ic) (Max)	1 A
Power - Max	2 W
Vce Saturation (Max) @ Ib, Ic	700mV @ 125mA, 1A
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 1A, 4V
Frequency - Transition	3MHz
Operating Temperature	150°C (TJ)
Package / Case	TO-220-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the TIP29CTSTU is determined by matching the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 100 V
Package / Case: TO-220-3
Mounting Type: Through Hole

Flexible Parameters (May Exceed Specification):

Current - Collector (Ic) (Max): 1 A minimum; higher ratings are acceptable
Power - Max: 2 W minimum; higher ratings are acceptable
Vce Saturation, DC Current Gain, and Frequency - Transition: Equivalent or superior performance acceptable

Substitute parts are grouped into three categories:

Parametric Equivalent: Identical electrical specifications and package; direct replacement with no design modification required.

Similar Substitute: Exceeds one or more electrical parameters (current, power, or frequency) while maintaining voltage and package compatibility; suitable for direct substitution with enhanced performance margin.

Higher Current Substitute: Significantly higher current rating (6 A or greater); suitable for applications requiring increased current handling capacity within the same voltage and package class.

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Vce Sat @ Ib, Ic	hFE (Min) @ Ic, Vce	Frequency	Package	Product Status
TIP29CTSTU	onsemi	NPN	1 A	100 V	2 W	700mV @ 125mA, 1A	15 @ 1A, 4V	3MHz	TO-220-3	Obsolete
TIP29CG	onsemi	NPN	1 A	100 V	2 W	700mV @ 125mA, 1A	15 @ 1A, 4V	3MHz	TO-220-3	Active
TIP29C	NTE Electronics, Inc	NPN	1 A	100 V	2 W	700mV @ 125mA, 1A	15 @ 1A, 4V	3MHz	TO-220-3	Active
BD239C	STMicroelectronics	NPN	2 A	100 V	2 W	700mV @ 200mA, 1A	15 @ 1A, 4V	Not Specified	TO-220-3	Active
BD239CTU	onsemi	NPN	2 A	100 V	30 W	700mV @ 200mA, 1A	15 @ 1A, 4V	Not Specified	TO-220-3	Last Time Buy
TIP31CG	onsemi	NPN	3 A	100 V	2 W	1.2V @ 375mA, 3A	10 @ 3A, 4V	3MHz	TO-220-3	Active
BD243CG	onsemi	NPN	6 A	100 V	65 W	1.5V @ 1A, 6A	15 @ 3A, 4V	3MHz	TO-220-3	Active
BD911	NTE Electronics, Inc	NPN	15 A	100 V	90 W	3V @ 2.5A, 10A	40 @ 500mA, 4V	3MHz	TO-220-3	Active

Engineering Selection Recommendations

Primary Recommendation: TIP29CG

The TIP29CG (onsemi) is the optimal direct replacement for the obsolete TIP29CTSTU. This part maintains identical electrical specifications across all critical parameters: 1 A maximum collector current, 100 V breakdown voltage, 2 W power rating, and 3 MHz transition frequency. The TIP29CG is in active production status with RoHS3 compliance and REACH unaffected certification. This part requires no design modification and provides full functional equivalence.

Secondary Recommendation: TIP29C

The TIP29C (NTE Electronics, Inc) provides parametric equivalence to the TIP29CTSTU with identical electrical ratings and TO-220-3 package. This part is in active production status with RoHS3 compliance. REACH status is listed as vendor undefined. This part is suitable for direct substitution with no design changes required.

Alternative for Enhanced Current Margin: BD239C

The BD239C (STMicroelectronics) doubles the maximum collector current to 2 A while maintaining 100 V breakdown voltage and TO-220-3 package compatibility. This part is in active production status with RoHS3 compliance and REACH unaffected certification. The BD239C is suitable for applications requiring additional current headroom without design modification.

Alternative for Enhanced Power Dissipation: BD239CTU

The BD239CTU (onsemi) provides 2 A collector current with significantly increased power rating of 30 W compared to the 2 W specification of the TIP29CTSTU. This part is classified as Last Time Buy status. The BD239CTU is suitable for applications requiring enhanced thermal performance and power handling capacity.

Higher Current Alternatives: TIP31CG, BD243CG, BD911

These parts provide progressively higher current ratings (3 A, 6 A, and 15 A respectively) while maintaining 100 V breakdown voltage and TO-220-3 package compatibility. These alternatives are suitable for applications requiring significantly increased current handling capacity. All three parts are in active production status with appropriate compliance certifications. Selection among these options depends on specific current requirements and thermal design considerations.

Compliance Considerations:

All recommended substitute parts maintain REACH unaffected status and EAR99 export classification consistent with the original TIP29CTSTU. RoHS3 compliance is confirmed for all active production alternatives. The BD911 is noted as RoHS non-compliant and should be selected only when RoHS compliance is not a design requirement.

Frequently Asked Questions (FAQ)

Q: Can the TIP29CG be used as a direct replacement for the TIP29CTSTU without any circuit modifications?

A: Yes. The TIP29CG maintains identical electrical specifications and package configuration. No circuit modifications are required for direct substitution.

Q: What is the primary reason for finding a substitute for the TIP29CTSTU?

A: The TIP29CTSTU is classified as obsolete. Substitute parts ensure design continuity and production availability for new builds and field replacements.

Q: Are there differences in thermal performance between the TIP29CTSTU and its substitutes?

A: The TIP29CG and TIP29C maintain the same 2 W power rating as the original part. The BD239CTU provides significantly enhanced thermal performance with a 30 W power rating. The BD243CG and BD911 offer even greater thermal capacity at 65 W and 90 W respectively.

Q: Can I use the BD239C as a substitute if my circuit is designed for 1 A maximum current?

A: Yes. The BD239C is rated for 2 A maximum collector current, which exceeds the 1 A requirement. This provides additional current margin without affecting circuit operation. The part maintains 100 V breakdown voltage and TO-220-3 package compatibility.

Q: What is the difference between TIP29CG and TIP29C?

A: Both parts provide identical electrical specifications and package configuration. The primary difference is manufacturer: TIP29CG is manufactured by onsemi, while TIP29C is manufactured by NTE Electronics, Inc. Both are in active production status with appropriate compliance certifications.

Q: Is the BD911 suitable for all applications requiring a TIP29CTSTU replacement?

A: The BD911 provides significantly higher current (15 A) and power (90 W) ratings, making it suitable for applications requiring enhanced performance margins. However, the BD911 is RoHS non-compliant. Selection should be based on specific application requirements and compliance mandates.

Q: Can I use a higher-current substitute like the BD243CG in a circuit designed for 1 A?

A: Yes. The BD243CG is rated for 6 A maximum collector current and maintains 100 V breakdown voltage and TO-220-3 package compatibility. Higher current ratings provide additional performance margin without affecting circuit operation at lower current levels.

Q: What packaging considerations apply to these substitute parts?

A: All substitute parts listed use the TO-220-3 through-hole package, maintaining mechanical and thermal interface compatibility with the original TIP29CTSTU. No PCB layout modifications are required.

Q: Are all substitute parts RoHS compliant?

A: Most substitute parts are RoHS3 compliant. The BD911 is noted as RoHS non-compliant. Verify compliance requirements for your specific application before final part selection.

Q: What is the significance of "Last Time Buy" status for the BD239CTU?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this part. Existing inventory may be available, but future production is not guaranteed. For long-term design continuity, select parts with Active production status such as TIP29CG, TIP29C, BD239C, TIP31CG, BD243CG, or BD911.

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