KSC2690AOS Equivalent & Substitute Parts

Part Overview

The KSC2690AOS is an NPN bipolar junction transistor manufactured by onsemi, rated for 160 V collector-emitter breakdown voltage and 1.2 A maximum collector current. The device is packaged in TO-126-3 through-hole configuration and is designed for general-purpose switching and amplification applications. The KSC2690AOS is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	160	V
Current - Collector (Ic) (Max)	1.2	A
Power - Max	1.2	W
Frequency - Transition	155	MHz
Mounting Type	Through Hole	—
Package / Case	TO-126-3	—
Operating Temperature (Max)	150	°C

Substitute Part Grouping Explanation

Substitution of the KSC2690AOS is determined by electrical and mechanical parameter compatibility. The primary substitution criteria are:

Electrical Parameters:

Transistor type must be NPN
Voltage - Collector Emitter Breakdown rating must equal or exceed 160 V
Current - Collector (Ic) maximum rating must equal or exceed 1.2 A
Power dissipation rating must equal or exceed 1.2 W
Frequency - Transition must equal or exceed 155 MHz

Mechanical Parameters:

Mounting type must be Through Hole
Package / Case must be TO-126-3 or equivalent TO-225AA footprint

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical specifications and packaging) and Functional Alternatives (different electrical ratings but compatible mechanical interface).

Parameter Comparison

Parameter	KSC2690AOS	KSC2690AYS	KSC2690AYSTU	MJE340
Manufacturer	onsemi	onsemi	onsemi	NTE Electronics, Inc
Product Status	Obsolete	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	160 V	160 V	160 V	300 V
Current - Collector (Ic) (Max)	1.2 A	1.2 A	1.2 A	500 mA
Power - Max	1.2 W	1.2 W	1.2 W	20 W
Frequency - Transition	155 MHz	155 MHz	155 MHz	—
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-126-3	TO-126-3	TO-126-3	TO-126
Operating Temperature (Max)	150°C	150°C	150°C	—
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	—

Engineering Selection Recommendations

Direct Equivalents (Preferred):

KSC2690AYS and KSC2690AYSTU are direct electrical and mechanical equivalents to the KSC2690AOS. Both parts maintain identical voltage, current, power, and frequency specifications. Both are classified as Active product status, ensuring long-term availability. KSC2690AYSTU is supplied in tube packaging with 35,785 units in stock, providing the highest inventory availability. KSC2690AYS is supplied in bulk packaging with 1,350 units in stock. Both substitute parts are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements.

Functional Alternative:

MJE340 is a functional alternative manufactured by NTE Electronics, Inc. This part differs in electrical specifications: it provides higher voltage rating (300 V versus 160 V) and higher power dissipation (20 W versus 1.2 W), but lower maximum collector current (500 mA versus 1.2 A). The MJE340 does not provide transition frequency specification. The MJE340 is RoHS non-compliant. Selection of MJE340 is appropriate only when circuit requirements permit the higher voltage rating and lower current rating, and when RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can KSC2690AYS directly replace KSC2690AOS in existing designs?

A: Yes. KSC2690AYS maintains identical electrical specifications (160 V, 1.2 A, 1.2 W, 155 MHz) and mechanical packaging (TO-126-3 through-hole). The primary difference is product status (Active versus Obsolete) and RoHS compliance (ROHS3 Compliant). Pin configuration and functional performance are equivalent.

Q: What is the difference between KSC2690AYS and KSC2690AYSTU?

A: Both parts are electrically identical. The difference is packaging format: KSC2690AYS is supplied in bulk packaging, while KSC2690AYSTU is supplied in tube packaging. KSC2690AYSTU has significantly higher inventory availability (35,785 units versus 1,350 units). Selection depends on procurement and assembly requirements.

Q: Is MJE340 a suitable replacement for KSC2690AOS?

A: MJE340 is a functional alternative with different electrical specifications. It provides higher voltage rating (300 V) and higher power dissipation (20 W), but lower maximum collector current (500 mA). MJE340 is suitable only when circuit design permits these parameter differences. MJE340 is RoHS non-compliant, which may restrict use in regulated applications.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: (1) Transistor type (NPN), (2) Voltage - Collector Emitter Breakdown rating (minimum 160 V), (3) Current - Collector maximum rating (minimum 1.2 A), (4) Power dissipation rating (minimum 1.2 W), (5) Frequency - Transition (minimum 155 MHz), (6) Mounting type (Through Hole), and (7) Package / Case (TO-126-3 or equivalent footprint).

Q: Are there compliance differences between substitute parts?

A: Yes. KSC2690AYS and KSC2690AYSTU are ROHS3 compliant and REACH unaffected. KSC2690AOS does not specify RoHS status. MJE340 is RoHS non-compliant. Applications requiring RoHS compliance must use KSC2690AYS or KSC2690AYSTU.

Q: What is the inventory status of each substitute part?

A: KSC2690AYSTU has the highest availability with 35,785 units in stock. KSC2690AYS has 1,350 units in stock. MJE340 has 1,957 units in stock. KSC2690AOS (obsolete) has 2,100 units in stock.

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