KSH117TM Equivalent & Substitute Parts

Part Overview

The KSH117TM is a PNP Darlington bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 2 A maximum collector current. The device is housed in a DPAK (TO-252-3) surface mount package and is designed for general-purpose switching and amplification applications requiring moderate power dissipation.

The KSH117TM carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements for applications utilizing this transistor.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP - Darlington	—
Current - Collector (Ic) (Max)	2	A
Voltage - Collector Emitter Breakdown (Max)	100	V
Vce Saturation (Max) @ Ib, Ic	3 V @ 40 mA, 4 A	—
Current - Collector Cutoff (Max)	20	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	1000 @ 2 A, 3 V	—
Power - Max	1.75	W
Frequency - Transition	25	MHz
Mounting Type	Surface Mount	—
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the KSH117TM is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

Transistor Type: PNP - Darlington
Maximum Collector Current (Ic): 2 A
Maximum Collector-Emitter Breakdown Voltage: 100 V
Vce Saturation characteristics: 3 V @ 40 mA, 4 A
Maximum Collector Cutoff Current: 20 µA
DC Current Gain (hFE): 1000 @ 2 A, 3 V
Transition Frequency: 25 MHz

Mechanical Parameters (Must Match):

Mounting Type: Surface Mount
Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
Supplier Device Package: DPAK

Compliance Parameters:

Moisture Sensitivity Level: 1 (Unlimited)
REACH Status: REACH Unaffected
ECCN: EAR99

Substitute parts are grouped into two categories: Direct Manufacturer Equivalents (same manufacturer, active product status) and Parametric Equivalents (matching electrical and mechanical specifications, including cross-manufacturer options).

Parameter Comparison

Parameter	KSH117TM	MJD117G	MJD117T4G	NJVMJD117T4G	MJD117T4 (STM)
Manufacturer	onsemi	onsemi	onsemi	onsemi	STMicroelectronics
Product Status	Obsolete	Active	Active	Obsolete	Active
Transistor Type	PNP - Darlington	PNP - Darlington	PNP - Darlington	PNP - Darlington	PNP - Darlington
Ic (Max)	2 A	2 A	2 A	2 A	2 A
Vce Breakdown (Max)	100 V	100 V	100 V	100 V	100 V
Vce Saturation (Max)	3 V @ 40 mA, 4 A	3 V @ 40 mA, 4 A	3 V @ 40 mA, 4 A	3 V @ 40 mA, 4 A	3 V @ 40 mA, 4 A
Ic Cutoff (Max)	20 µA	20 µA	20 µA	20 µA	20 µA
hFE (Min) @ Ic, Vce	1000 @ 2 A, 3 V	1000 @ 2 A, 3 V	1000 @ 2 A, 3 V	1000 @ 2 A, 3 V	1000 @ 2 A, 3 V
Power - Max	1.75 W	1.75 W	1.75 W	1.75 W	20 W
Frequency - Transition	25 MHz	25 MHz	25 MHz	25 MHz	25 MHz
Operating Temperature (TJ)	150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	150°C
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Recommendation: MJD117T4G (onsemi)

The MJD117T4G is the preferred substitute for the obsolete KSH117TM. This part is manufactured by onsemi, the original KSH117TM manufacturer, and maintains active product status. All critical electrical parameters match exactly: 2 A collector current, 100 V breakdown voltage, 1000 hFE minimum gain, and 25 MHz transition frequency. The device is supplied in Cut Tape (CT) and Digi-Reel® packaging, ensuring reliable availability for production environments. The MJD117T4G carries ROHS3 compliance and maintains the same DPAK surface mount package footprint. Operating temperature range extends to -65°C, providing broader environmental coverage than the original part.

Secondary Recommendation: MJD117G (onsemi)

The MJD117G offers an alternative onsemi-sourced substitute with identical electrical specifications and active product status. This part is supplied in tube packaging and is suitable for applications where alternative packaging formats are acceptable. All core electrical parameters remain equivalent to the KSH117TM.

Alternative Option: MJD117T4 (STMicroelectronics)

The STMicroelectronics MJD117T4 provides a cross-manufacturer substitute with matching electrical and mechanical specifications. This part is active and ROHS3 compliant. A notable distinction is the maximum power rating of 20 W compared to 1.75 W for the onsemi variants. This higher power rating does not affect substitution compatibility but may provide additional thermal margin in power-constrained applications. Operating temperature specification is limited to 150°C maximum.

Obsolete Parts (Not Recommended for New Designs):

The NJVMJD117T4G carries obsolete product status and should not be selected for new production designs despite matching electrical specifications. This part is retained in the equivalence list for reference in legacy system maintenance only.

Frequently Asked Questions (FAQ)

Q: Can the MJD117T4G directly replace the KSH117TM without circuit modifications?

A: Yes. The MJD117T4G is a direct electrical and mechanical equivalent. All critical parameters—collector current, breakdown voltage, saturation characteristics, current gain, and transition frequency—are identical. The DPAK surface mount package footprint is unchanged. No circuit modifications are required.

Q: What is the difference between MJD117G and MJD117T4G?

A: Both parts are onsemi-manufactured PNP Darlington transistors with identical electrical specifications. The primary difference is packaging format: MJD117G is supplied in tube packaging, while MJD117T4G is supplied in Cut Tape (CT) and Digi-Reel® format. Selection depends on production volume and handling requirements.

Q: Why does the STMicroelectronics MJD117T4 have a 20 W power rating while onsemi parts are rated at 1.75 W?

A: The power rating difference reflects different thermal design specifications between manufacturers. Both parts share identical electrical performance characteristics and are suitable for the same applications. The higher power rating of the STMicroelectronics variant does not affect functional compatibility but may provide additional thermal headroom in applications approaching power dissipation limits.

Q: Is the NJVMJD117T4G suitable for new production designs?

A: No. The NJVMJD117T4G carries obsolete product status and should not be selected for new designs. This part is listed for reference in legacy system support and maintenance applications only. Use MJD117T4G or MJD117G for new production.

Q: Are all substitute parts ROHS3 compliant?

A: The onsemi variants (MJD117G and MJD117T4G) and the STMicroelectronics MJD117T4 are all ROHS3 compliant. The original KSH117TM does not specify RoHS status. All substitute parts meet current environmental compliance requirements.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not affect electrical substitution compatibility. The onsemi MJD117T4G and NJVMJD117T4G extend the operating range to -65°C, providing broader environmental coverage than the KSH117TM and STMicroelectronics MJD117T4, which are limited to 150°C maximum. Selection should account for application temperature requirements.

Q: Can I use the MJD117T4 from STMicroelectronics in a design originally specified for the KSH117TM?

A: Yes. The STMicroelectronics MJD117T4 is electrically and mechanically equivalent to the KSH117TM. All critical parameters match, and the DPAK package footprint is identical. The part is active and ROHS3 compliant. Cross-manufacturer substitution is valid for this device class.

Q: What inventory status should I consider when selecting a substitute?

A: Inventory availability is a practical consideration for procurement. MJD117T4G (onsemi) has the highest inventory level at 17,041 pieces. MJD117T4 (STMicroelectronics) has 19,400 pieces available. MJD117G (onsemi) has 1,280 pieces. Verify current inventory with your supplier before finalizing part selection.

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