KSC1845ETA Equivalent & Substitute Parts

Part Overview

The KSC1845ETA is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 50 mA, collector-emitter breakdown voltage of 120 V, and maximum power dissipation of 500 mW in a Through Hole TO-92-3 package.

The KSC1845ETA is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to support ongoing maintenance, repair, and redesign activities for legacy systems and applications utilizing this component.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	50	mA
Voltage - Collector Emitter Breakdown (Max)	120	V
Vce Saturation (Max) @ Ib, Ic	300mV @ 1mA, 10mA	—
Current - Collector Cutoff (Max)	50	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	400	@ 1mA, 6V
Power - Max	500	mW
Frequency - Transition	110	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—
REACH Status	REACH Unaffected	—

Substitute Part Grouping Explanation

Substitution of the KSC1845ETA is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

Transistor type (NPN)
Maximum collector current (50 mA)
Collector-emitter breakdown voltage (120 V)
Vce saturation characteristics (300mV @ 1mA, 10mA)
Collector cutoff current (50 nA maximum)
Transition frequency (110 MHz)
Maximum power dissipation (500 mW)

Mechanical Parameters:

Mounting type (Through Hole)
Package designation (TO-92-3)

Environmental Parameters:

Operating temperature range (150°C maximum junction temperature)

Substitute parts must match all electrical specifications, maintain identical package form factor, and support the same operating temperature range. Variations in DC current gain (hFE) are acceptable provided the minimum specification is met or exceeded.

Parameter Comparison

Parameter	KSC1845ETA	KSC1845FTA	Unit
Manufacturer	onsemi	onsemi	—
Transistor Type	NPN	NPN	—
Current - Collector (Ic) (Max)	50	50	mA
Voltage - Collector Emitter Breakdown (Max)	120	120	V
Vce Saturation (Max) @ Ib, Ic	300mV @ 1mA, 10mA	300mV @ 1mA, 10mA	—
Current - Collector Cutoff (Max)	50	50	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	400 @ 1mA, 6V	300 @ 1mA, 6V	—
Power - Max	500	500	mW
Frequency - Transition	110	110	MHz
Operating Temperature (TJ)	150	150	°C
Mounting Type	Through Hole	Through Hole	—
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	—
Product Status	Obsolete	Active	—
REACH Status	REACH Unaffected	REACH Unaffected	—

Engineering Selection Recommendations

The KSC1845FTA is a direct electrical and mechanical equivalent to the KSC1845ETA. Both devices are manufactured by onsemi and share identical electrical specifications across all critical parameters: collector current, breakdown voltage, saturation characteristics, cutoff current, transition frequency, and power dissipation. Both devices utilize the Through Hole TO-92-3 package and support the same 150°C maximum junction temperature.

The primary distinction between these parts is product status and packaging format. The KSC1845ETA is classified as obsolete, while the KSC1845FTA maintains active product status. The KSC1845FTA is supplied in Cut Tape (CT) packaging, whereas the KSC1845ETA packaging format is not specified in the provided data.

Both parts are REACH Unaffected and carry the same ECCN and HTSUS classifications, confirming regulatory equivalence.

The KSC1845FTA is suitable for direct substitution in applications currently utilizing the KSC1845ETA, with no circuit modifications required.

Frequently Asked Questions (FAQ)

Q: Can the KSC1845FTA replace the KSC1845ETA in existing designs?

A: Yes. The KSC1845FTA is electrically and mechanically equivalent to the KSC1845ETA. All critical electrical parameters—collector current, breakdown voltage, saturation characteristics, transition frequency, and power dissipation—are identical. Both devices use the Through Hole TO-92-3 package and operate within the same temperature range.

Q: What is the difference between the KSC1845ETA and KSC1845FTA?

A: The primary differences are product status and packaging format. The KSC1845ETA is obsolete, while the KSC1845FTA is an active product. The KSC1845FTA is supplied in Cut Tape (CT) packaging. Electrically, both devices are equivalent.

Q: Are there any DC current gain differences between these parts?

A: The KSC1845ETA specifies a minimum DC current gain (hFE) of 400 @ 1mA, 6V, while the KSC1845FTA specifies a minimum of 300 @ 1mA, 6V. The KSC1845FTA meets the minimum requirement but with a lower specification. This difference is acceptable for most general-purpose switching and amplification applications.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the KSC1845ETA and KSC1845FTA are REACH Unaffected and carry identical ECCN (EAR99) and HTSUS (8541.21.0075) classifications.

Q: Is the TO-92-3 package compatible with existing PCB layouts?

A: Yes. Both parts use the Through Hole TO-92-3 package, ensuring mechanical and pin compatibility with existing circuit board designs. No layout modifications are required.

Q: What is the moisture sensitivity level for these parts?

A: The KSC1845ETA has a Moisture Sensitivity Level (MSL) of 1 (Unlimited). The KSC1845FTA lists MSL as Not Applicable. Both designations indicate minimal moisture sensitivity concerns for handling and storage.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message