KSC1815GRTA Equivalent & Substitute Parts

Part Overview

The KSC1815GRTA is a Bipolar (BJT) NPN transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device operates at a maximum collector voltage of 50 V with a collector current rating of 150 mA and a maximum power dissipation of 400 mW. The KSC1815GRTA is classified as an obsolete product, which necessitates identification of active equivalent alternatives to ensure continued design support and procurement availability for new production runs and field replacements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	150	mA
Voltage - Collector Emitter Breakdown (Max)	50	V
Vce Saturation (Max) @ Ib, Ic	250 mV @ 10 mA, 100 mA	—
Current - Collector Cutoff (Max)	100	nA
Power - Max	400	mW
Frequency - Transition	80	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—

Substitute Part Grouping Explanation

Substitution of the KSC1815GRTA is determined by electrical and mechanical parameter equivalence within the NPN BJT transistor category. The following parameters establish substitution eligibility:

Electrical Parameters (Must Match):

Transistor Type: NPN
Current - Collector (Ic) (Max): 150 mA
Voltage - Collector Emitter Breakdown (Max): 50 V
Power - Max: 400 mW
Frequency - Transition: 80 MHz
Operating Temperature (TJ): 150 °C
Vce Saturation (Max) @ Ib, Ic: 250 mV @ 10 mA, 100 mA
Current - Collector Cutoff (Max): 100 nA

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package / Case: TO-92-3

The KSC1815YTA meets all electrical and mechanical substitution criteria for the KSC1815GRTA. Both devices share identical maximum ratings, saturation characteristics, and physical packaging specifications. The primary distinction between these parts is product status and DC current gain specification.

Parameter Comparison

Parameter	KSC1815GRTA	KSC1815YTA	Match
Transistor Type	NPN	NPN	✓
Current - Collector (Ic) (Max)	150 mA	150 mA	✓
Voltage - Collector Emitter Breakdown (Max)	50 V	50 V	✓
Vce Saturation (Max) @ Ib, Ic	250 mV @ 10 mA, 100 mA	250 mV @ 10 mA, 100 mA	✓
Current - Collector Cutoff (Max)	100 nA	100 nA	✓
Power - Max	400 mW	400 mW	✓
Frequency - Transition	80 MHz	80 MHz	✓
Operating Temperature (TJ)	150 °C	150 °C	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	TO-92-3	TO-92-3	✓
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2 mA, 6 V	70 @ 2 mA, 6 V	Different
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

The KSC1815YTA is the direct electrical and mechanical equivalent for the obsolete KSC1815GRTA. Both devices are manufactured by onsemi and share identical maximum ratings, saturation characteristics, and TO-92-3 through-hole packaging.

Product Status Consideration: The KSC1815GRTA is classified as obsolete, while the KSC1815YTA maintains active product status. The KSC1815YTA is the recommended substitute for new designs and procurement activities requiring long-term component availability.

Compliance Status: The KSC1815YTA is ROHS3 compliant and REACH unaffected. Both parts carry EAR99 export classification and identical HTSUS commodity codes.

DC Current Gain Variance: The KSC1815YTA specifies a minimum DC current gain (hFE) of 70 @ 2 mA, 6 V, compared to 200 @ 2 mA, 6 V for the KSC1815GRTA. This difference reflects manufacturing tolerance bands within the KSC1815 base product family. Circuit designs must accommodate this variance through appropriate base resistor selection and bias network design to ensure stable operation across the specified hFE range.

Frequently Asked Questions (FAQ)

Q: Can the KSC1815YTA directly replace the KSC1815GRTA in existing circuit designs?

A: Yes. The KSC1815YTA is electrically and mechanically equivalent to the KSC1815GRTA. Both devices share identical maximum ratings, saturation characteristics, and TO-92-3 package specifications. No circuit modifications are required for direct substitution.

Q: What is the significance of the different DC current gain specifications?

A: The KSC1815GRTA specifies a minimum hFE of 200, while the KSC1815YTA specifies a minimum hFE of 70, both measured at 2 mA collector current and 6 V collector-emitter voltage. Both values fall within the normal manufacturing tolerance band for the KSC1815 base product family. Circuit designs using base resistor networks and bias stabilization techniques accommodate this variance without performance degradation.

Q: Are there packaging differences between these parts?

A: No. Both the KSC1815GRTA and KSC1815YTA are supplied in TO-92-3 through-hole packages with formed leads. Physical dimensions, lead spacing, and mounting characteristics are identical.

Q: Why is the KSC1815GRTA classified as obsolete?

A: The KSC1815GRTA has reached end-of-life status in onsemi's product portfolio. The KSC1815YTA represents the active equivalent within the same product family and is the recommended selection for new designs and ongoing procurement.

Q: What is the difference between the Cut Tape packaging of KSC1815YTA and the packaging of KSC1815GRTA?

A: Packaging format refers to the supply method for component distribution. Cut Tape (CT) indicates the KSC1815YTA is supplied on tape that is cut to order, facilitating automated assembly processes. Both parts are identical in physical form factor and electrical performance; the packaging format difference affects only procurement and assembly logistics, not component functionality or compatibility.

Q: Are both parts REACH and RoHS compliant?

A: Both parts are REACH unaffected. The KSC1815YTA is ROHS3 compliant. Compliance documentation should be verified with the component supplier for specific application requirements.

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