KSH29CTF Equivalent & Substitute Parts

Part Overview

The KSH29CTF 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 surface mount DPAK package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The KSH29CTF serves applications requiring moderate power switching and amplification in compact surface mount form factors.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	100 V
Current - Collector (Ic) (Max)	1 A
Vce Saturation (Max) @ Ib, Ic	700mV @ 125mA, 1A
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 1A, 4V
Power - Max	1.56 W
Frequency - Transition	3MHz
Operating Temperature	150°C (TJ)
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the KSH29CTF is determined by matching the following critical electrical and mechanical parameters:

Electrical Matching Criteria:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 100 V minimum
Current - Collector (Ic) (Max): 1 A or greater
Vce Saturation characteristics compatible with application requirements
DC Current Gain (hFE) sufficient for circuit design
Frequency - Transition: 3MHz or greater
Power dissipation capability: 1.56 W or greater

Mechanical Matching Criteria:

Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63 for direct PCB compatibility
Mounting Type: Surface Mount
Moisture Sensitivity Level (MSL): 1 (Unlimited)
RoHS3 Compliance for regulatory alignment

Substitute parts are grouped into two categories:

Category 1: Direct Pin-Compatible Substitutes (Same Package) Parts maintaining identical DPAK surface mount packaging with electrical parameters meeting or exceeding KSH29CTF specifications. These include MJD31CG, MJD31CRLG, MJD31CT4G, and MJD31C-13.

Category 2: Higher Current Capability Substitutes (Same Package) Parts with increased collector current ratings (2 A to 6 A) in the same DPAK package, suitable for applications requiring additional current margin. These include 2SC4134T-TL-E, 2SC4135S-TL-E, 2SC4135T-TL-E, and MJD41CT4G.

Category 3: Alternative Package Substitutes (Through Hole) Parts with equivalent electrical specifications but different mechanical packaging (TO-220 through hole), applicable when PCB layout permits package variation. This includes TIP29CG.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Vce Sat @ Ib, Ic	hFE (Min) @ Ic, Vce	Power (Max)	Frequency	Package	Product Status
KSH29CTF	onsemi	1 A	100 V	700mV @ 125mA, 1A	15 @ 1A, 4V	1.56 W	3MHz	DPAK	Obsolete
2SC4134T-TL-E	onsemi	1 A	100 V	400mV @ 40mA, 400mA	200 @ 100mA, 5V	800 mW	120MHz	DPAK	Active
2SC4135S-TL-E	onsemi	2 A	100 V	400mV @ 100mA, 1A	140 @ 100mA, 5V	1 W	120MHz	DPAK	Obsolete
2SC4135T-TL-E	onsemi	2 A	100 V	400mV @ 100mA, 1A	200 @ 100mA, 5V	1 W	120MHz	DPAK	Active
MJD31CG	onsemi	3 A	100 V	1.2V @ 375mA, 3A	10 @ 3A, 4V	1.56 W	3MHz	DPAK	Active
MJD31CRLG	onsemi	3 A	100 V	1.2V @ 375mA, 3A	10 @ 3A, 4V	1.56 W	3MHz	DPAK	Active
MJD31CT4G	onsemi	3 A	100 V	1.2V @ 375mA, 3A	10 @ 3A, 4V	1.56 W	3MHz	DPAK	Active
MJD41CT4G	onsemi	6 A	100 V	1.5V @ 600mA, 6A	15 @ 3A, 4V	1.75 W	3MHz	DPAK	Active
TIP29CG	onsemi	1 A	100 V	700mV @ 125mA, 1A	15 @ 1A, 4V	2 W	3MHz	TO-220	Active
MJD31C-13	Diodes Incorporated	3 A	100 V	1.2V @ 375mA, 3A	10 @ 3A, 4V	1.56 W	3MHz	DPAK	Active
MJD31CT4	onsemi	3 A	100 V	1.2V @ 375mA, 3A	10 @ 3A, 4V	15 W	3MHz	DPAK	Obsolete

Engineering Selection Recommendations

For Direct Replacement with Active Product Status:

The MJD31CG, MJD31CRLG, and MJD31CT4G are recommended as primary substitutes for the obsolete KSH29CTF. All three parts are manufactured by onsemi, maintain identical DPAK surface mount packaging, and share the same 100 V breakdown voltage and 3MHz transition frequency. These parts are classified as Active products, ensuring long-term availability and supply chain continuity. All three are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's regulatory and environmental specifications.

The MJD31C-13, manufactured by Diodes Incorporated, provides an alternative from a different manufacturer with identical electrical and mechanical specifications. This part is Active and ROHS3 compliant, offering supply diversification.

For Applications Requiring Higher Current Capability:

The MJD41CT4G supports 6 A collector current while maintaining the same 100 V breakdown voltage, 3MHz transition frequency, and DPAK packaging. This part is suitable for applications where the original 1 A specification provides insufficient current margin. The MJD41CT4G is Active and ROHS3 compliant.

For Applications Permitting Package Variation:

The TIP29CG provides electrical equivalence to the KSH29CTF with identical 1 A current rating, 100 V breakdown voltage, and 3MHz transition frequency. However, this part uses a through-hole TO-220 package rather than surface mount DPAK. The TIP29CG is Active and ROHS3 compliant, suitable only for designs where PCB layout accommodates through-hole mounting.

For Higher Frequency Applications:

The 2SC4134T-TL-E and 2SC4135T-TL-E offer significantly higher transition frequencies (120MHz versus 3MHz) while maintaining 100 V breakdown voltage and DPAK packaging. The 2SC4135T-TL-E supports 2 A collector current. Both parts are ROHS3 compliant. The 2SC4134T-TL-E is Active; the 2SC4135T-TL-E is Active. These parts are suitable for applications requiring improved high-frequency performance.

Compliance Considerations:

All recommended active substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. The original KSH29CTF is obsolete; all recommended substitutes are Active products except where noted as Obsolete. Selection should prioritize Active products to ensure procurement viability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can MJD31CG directly replace KSH29CTF without circuit modification?

A: MJD31CG is pin-compatible in the DPAK package and shares the same 100 V breakdown voltage and 3MHz transition frequency. However, MJD31CG supports 3 A collector current versus KSH29CTF's 1 A rating. Circuit operation depends on whether the application operates at or near the 1 A limit. If the circuit is designed for 1 A operation, MJD31CG functions as a direct replacement with additional current margin. If the circuit relies on current limiting at 1 A, circuit behavior may change.

Q: What is the difference between MJD31CG, MJD31CRLG, and MJD31CT4G?

A: All three parts are electrically identical with 3 A collector current, 100 V breakdown voltage, and 3MHz transition frequency in DPAK packaging. The differences are packaging format and supplier designation: MJD31CG is supplied in Tube packaging, MJD31CRLG in Cut Tape & Digi-Reel format, and MJD31CT4G in Cut Tape & Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Why does MJD31CT4 show 15 W power rating versus 1.56 W for other MJD31 variants?

A: MJD31CT4 is classified as Obsolete and shows a 15 W power rating, which differs from the 1.56 W specification of active MJD31 variants. This discrepancy reflects different product generations or specifications. Active MJD31 variants (MJD31CG, MJD31CRLG, MJD31CT4G) all specify 1.56 W maximum power and are recommended for new designs.

Q: Can TIP29CG be used as a substitute if PCB layout permits through-hole mounting?

A: TIP29CG provides electrical equivalence with identical 1 A collector current, 100 V breakdown voltage, 700mV Vce saturation, and 3MHz transition frequency. The primary difference is the TO-220 through-hole package versus DPAK surface mount. TIP29CG is suitable only if the PCB design accommodates through-hole mounting and thermal management requirements of the larger TO-220 package.

Q: What are the advantages of 2SC4135T-TL-E over KSH29CTF?

A: The 2SC4135T-TL-E offers three key advantages: (1) 2 A collector current versus 1 A, providing 2x current capability; (2) 120MHz transition frequency versus 3MHz, enabling higher-frequency applications; (3) Active product status ensuring long-term availability. The 2SC4135T-TL-E maintains 100 V breakdown voltage and DPAK packaging. Trade-offs include lower DC current gain (200 @ 100mA, 5V versus 15 @ 1A, 4V) and lower maximum power rating (1 W versus 1.56 W).

Q: Is MJD31C-13 from Diodes Incorporated equivalent to onsemi MJD31 variants?

A: MJD31C-13 from Diodes Incorporated is electrically and mechanically equivalent to onsemi MJD31CG, MJD31CRLG, and MJD31CT4G, with identical 3 A collector current, 100 V breakdown voltage, 1.2V Vce saturation, and 3MHz transition frequency in DPAK packaging. Both manufacturers' parts are ROHS3 compliant with MSL 1 (Unlimited). The primary difference is manufacturer, offering supply chain diversification.

Q: Why is MJD41CT4G recommended for higher current applications?

A: MJD41CT4G supports 6 A collector current, double the 3 A rating of MJD31 variants and 6x the original KSH29CTF 1 A rating. It maintains the same 100 V breakdown voltage, 3MHz transition frequency, and DPAK packaging. MJD41CT4G is suitable for applications where the original 1 A specification provides insufficient current margin or where future design scaling requires higher current capability.

Q: What packaging options are available for KSH29CTF substitutes?

A: Substitutes are available in two package types: (1) DPAK surface mount (TO-252-3), used by 2SC4134T-TL-E, 2SC4135S-TL-E, 2SC4135T-TL-E, MJD31CG, MJD31CRLG, MJD31CT4G, MJD41CT4G, and MJD31C-13; (2) TO-220 through-hole, used by TIP29CG. DPAK packaging maintains direct PCB compatibility with the original KSH29CTF. TO-220 requires PCB layout modification.

Q: Are all recommended substitutes RoHS3 compliant?

A: All recommended active substitutes are ROHS3 compliant: 2SC4134T-TL-E, 2SC4135T-TL-E, MJD31CG, MJD31CRLG, MJD31CT4G, MJD41CT4G, TIP29CG, and MJD31C-13. The original KSH29CTF is also ROHS3 compliant. Obsolete variants (2SC4135S-TL-E, MJD31CT4) are ROHS3 compliant or non-compliant as specified; these should not be selected for new designs.

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