STX715-AP Equivalent & Substitute Parts

Part Overview

The STX715-AP is an NPN bipolar junction transistor manufactured by STMicroelectronics, designed for general-purpose switching and amplification applications. This device features an 80 V collector-emitter breakdown voltage, 1.5 A maximum collector current, and 900 mW power dissipation capability in a through-hole TO-92AP package. The STX715-AP is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	1.5	A
Power - Max	900	mW
Frequency - Transition	50	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the STX715-AP are identified based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Transistor type: NPN configuration
Mounting type: Through hole
Package type: TO-92-3 compatible form factor
Maximum power dissipation: 900 mW
Operating temperature range: 150°C (TJ) maximum
RoHS3 compliance status

Electrical Performance Considerations: Substitute parts must maintain compatibility within the application's voltage and current requirements. The STX715-AP specifies 80 V maximum collector-emitter breakdown voltage and 1.5 A maximum collector current. Substitute devices with equal or higher voltage and current ratings are electrically compatible for direct replacement in circuits designed for the original part.

The KSC2383OTA and KSC2383YTA devices from onsemi meet all substitution criteria. Both parts feature higher voltage ratings (160 V) and lower maximum collector current (1 A) compared to the STX715-AP, but operate within the same power envelope (900 mW) and package configuration (TO-92-3 through hole).

Parameter Comparison

Parameter	STX715-AP	KSC2383OTA	KSC2383YTA	Unit
Manufacturer	STMicroelectronics	onsemi	onsemi	—
Product Status	Obsolete	Active	Active	—
Transistor Type	NPN	NPN	NPN	—
Voltage - Collector Emitter Breakdown (Max)	80	160	160	V
Current - Collector (Ic) (Max)	1.5	1	1	A
Power - Max	900	900	900	mW
Frequency - Transition	50	100	100	MHz
Operating Temperature (TJ)	150	150	150	°C
Mounting Type	Through Hole	Through Hole	Through Hole	—
Package / Case	TO-92-3	TO-92-3	TO-92-3	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	—

Engineering Selection Recommendations

Both KSC2383OTA and KSC2383YTA devices are suitable substitutes for the obsolete STX715-AP in through-hole applications requiring NPN bipolar junction transistor functionality.

KSC2383YTA is the preferred substitute option. This device maintains active product status with significantly higher inventory availability (155,200 pieces in stock), ensuring supply chain continuity. The KSC2383YTA delivers higher transition frequency (100 MHz versus 50 MHz) and superior DC current gain characteristics (160 @ 200mA, 5V), providing enhanced performance margins in switching and amplification circuits.

KSC2383OTA serves as an alternative substitute with identical electrical specifications to the KSC2383YTA, differentiated only by lower inventory levels (7,637 pieces in stock) and slightly lower DC current gain (100 @ 200mA, 5V). Both onsemi devices are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original STX715-AP.

The higher voltage rating (160 V) of both substitute parts provides additional design margin for applications originally specified at 80 V. The reduced maximum collector current (1 A versus 1.5 A) requires circuit verification to confirm compatibility with existing current requirements.

Frequently Asked Questions (FAQ)

Q: Can the KSC2383YTA or KSC2383OTA directly replace the STX715-AP without circuit modification?

A: Both KSC2383 variants are pin-compatible through-hole TO-92-3 devices with identical package geometry. Direct physical replacement is possible. Electrical compatibility depends on circuit current requirements; applications drawing more than 1 A at the collector require design review.

Q: What is the primary difference between KSC2383YTA and KSC2383OTA?

A: Both devices share identical electrical specifications and package configuration. The primary differences are DC current gain (160 versus 100 @ 200mA, 5V) and inventory availability. KSC2383YTA offers higher current gain and substantially greater stock levels.

Q: Why do the substitute parts have higher voltage ratings (160 V) than the original STX715-AP (80 V)?

A: Higher voltage ratings provide additional design margin and do not compromise circuit operation in applications specified for lower voltages. The substitute parts remain fully compatible with 80 V maximum circuit requirements.

Q: Are the KSC2383 devices suitable for high-frequency applications?

A: The KSC2383 transition frequency of 100 MHz exceeds the STX715-AP specification of 50 MHz, making these devices suitable for applications requiring higher switching speeds or operating frequencies.

Q: What compliance certifications apply to the substitute parts?

A: Both KSC2383OTA and KSC2383YTA are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original STX715-AP.

Q: Is circuit board layout modification required when substituting these parts?

A: No layout modification is required. Both substitute parts use the standard TO-92-3 through-hole package with identical lead spacing and pin configuration as the STX715-AP.

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