KSH122TM Equivalent & Substitute Parts

Part Overview

The KSH122TM is an NPN Darlington bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 8 A maximum collector current in a surface mount DPAK package. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production support. The part delivers 1.75 W maximum power dissipation with a minimum DC current gain of 1000 at 4 A collector current and 4 V collector-emitter voltage.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Collector Current (Max)	8	A
Collector-Emitter Breakdown Voltage (Max)	100	V
Vce Saturation (Max)	4	V @ 80mA, 8A
DC Current Gain (hFE) (Min)	1000	@ 4A, 4V
Power Dissipation (Max)	1.75	W
Operating Temperature (Max)	150	°C (TJ)
Mounting Type	Surface Mount	—
Package	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the KSH122TM is determined by strict equivalence across the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN - Darlington configuration
Collector Current (Max): 8 A minimum
Collector-Emitter Breakdown Voltage (Max): 100 V minimum
Vce Saturation: 4 V @ 80mA, 8A
DC Current Gain (hFE) (Min): 1000 @ 4A, 4V
Package: TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 Compliant

Direct Equivalents maintain all electrical specifications and power rating (1.75 W) with active product status. These parts are suitable for direct replacement in existing designs.

Similar Parts share the same voltage and package specifications but differ in collector current rating (2 A instead of 8 A) or voltage rating (60 V instead of 100 V). These parts are listed for reference only and are not suitable for applications requiring the full 8 A current capability or 100 V voltage rating of the KSH122TM.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) [A]	Vce(br) (Max) [V]	Vce Sat (Max) [V]	hFE (Min)	Power (Max) [W]	Frequency [MHz]	Temp Range [°C]	Package
KSH122TM	onsemi	Obsolete	8	100	4 @ 80mA, 8A	1000 @ 4A, 4V	1.75	—	–65 to 150	DPAK
MJD122G	onsemi	Active	8	100	4 @ 80mA, 8A	1000 @ 4A, 4V	20	4	–65 to 150	DPAK
MJD122T4G	onsemi	Active	8	100	4 @ 80mA, 8A	1000 @ 4A, 4V	1.75	4	–65 to 150	DPAK
MJD122T4	STMicroelectronics	Active	8	100	4 @ 80mA, 8A	1000 @ 4A, 4V	20	—	–65 to 150	DPAK
MJD122-TP	Micro Commercial Co	Active	8	100	4 @ 80mA, 8A	1000 @ 4A, 4V	1.5	—	–65 to 150	DPAK
NJVMJD112G	onsemi	Active	2	100	3 @ 40mA, 4A	1000 @ 2A, 3V	1.75	25	–65 to 150	DPAK
2SD1980TL	Rohm Semiconductor	Not For New Designs	2	100	1.5 @ 1mA, 1A	1000 @ 1A, 2V	10	—	–65 to 150	DPAK
2SD2143TL	Rohm Semiconductor	Not For New Designs	2	60	1.5 @ 1mA, 1A	1000 @ 1A, 2V	10	—	–65 to 150	DPAK

Engineering Selection Recommendations

Direct Replacement Parts (Active Status):

The following parts are suitable for direct replacement of the KSH122TM in applications requiring 8 A collector current and 100 V breakdown voltage:

MJD122T4G (onsemi): Maintains identical electrical specifications with active product status, extended operating temperature range (–65°C to 150°C), and 4 MHz transition frequency. Power rating of 1.75 W matches the original specification.
MJD122G (onsemi): Provides identical electrical specifications with active product status and extended operating temperature range. Power rating increased to 20 W offers enhanced thermal capability. Transition frequency of 4 MHz supports higher-speed applications.
MJD122T4 (STMicroelectronics): Cross-manufacturer equivalent with identical electrical specifications, active product status, and 20 W power rating. Suitable for applications where STMicroelectronics sourcing is preferred.
MJD122-TP (Micro Commercial Co): Maintains identical electrical specifications with active product status. Power rating of 1.5 W is marginally lower than the original 1.75 W specification but remains within acceptable tolerance for most applications.

All direct replacement parts are ROHS3 compliant and packaged in the same TO-252-3 DPAK configuration.

Similar Parts (Not Recommended for Direct Replacement):

The following parts share the same package and voltage rating but differ in current capability:

NJVMJD112G (onsemi): Rated for 2 A maximum collector current. Not suitable for applications requiring 8 A operation.
2SD1980TL (Rohm Semiconductor): Rated for 2 A maximum collector current with "Not For New Designs" status. Not suitable for 8 A applications.
2SD2143TL (Rohm Semiconductor): Rated for 2 A maximum collector current and 60 V breakdown voltage with "Not For New Designs" status. Not suitable for 8 A or 100 V applications.

Frequently Asked Questions (FAQ)

Q: Can MJD122G be used as a direct replacement for KSH122TM?

A: Yes. MJD122G maintains all critical electrical specifications: 8 A collector current, 100 V breakdown voltage, 4 V saturation voltage at rated conditions, and 1000 minimum DC current gain. Both are packaged in TO-252-3 DPAK and are ROHS3 compliant. MJD122G has active product status and extended operating temperature range (–65°C to 150°C).

Q: What is the difference between MJD122G and MJD122T4G?

A: Both parts are onsemi products with identical electrical specifications and active status. The primary difference is power dissipation rating: MJD122G is rated for 20 W while MJD122T4G is rated for 1.75 W. For applications with thermal constraints or lower power requirements, MJD122T4G is the closer match to the original KSH122TM specification.

Q: Why are NJVMJD112G, 2SD1980TL, and 2SD2143TL listed if they cannot replace the KSH122TM?

A: These parts are listed as reference information because they share the same package type (TO-252-3 DPAK) and Darlington configuration. However, they are not suitable for direct replacement due to reduced collector current rating (2 A instead of 8 A) or reduced voltage rating (60 V instead of 100 V). These parts are included in the original KSH122TM substitute list but do not meet the electrical requirements for equivalent operation.

Q: Is the KSH122TM still available?

A: The KSH122TM is classified as obsolete. Inventory of 15,100 pieces is currently available, but no new production is expected. For new designs and long-term production support, selection of an active equivalent part is required.

Q: Can I use MJD122-TP as a substitute if the power rating is slightly lower (1.5 W vs. 1.75 W)?

A: MJD122-TP maintains all electrical specifications and is suitable for applications where the 1.5 W power rating is adequate. The 0.25 W difference represents approximately 14% reduction in maximum power dissipation. Thermal analysis of the specific application is required to confirm acceptability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. The KSH122TM is also ROHS3 compliant. All parts have Moisture Sensitivity Level (MSL) of 1 (Unlimited) and REACH Unaffected status.

Q: What is the difference between Cut Tape (CT) & Digi-Reel and Tape & Reel (TR) packaging?

A: Both are reel-based packaging formats suitable for automated assembly. Cut Tape & Digi-Reel format allows for flexible quantity selection, while Tape & Reel format is optimized for high-volume production runs. Both formats are compatible with standard pick-and-place equipment.

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