2SA1020-Y-AP Equivalent & Substitute Parts

Part Overview

The 2SA1020-Y-AP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This component operates at 50 V collector-emitter breakdown voltage with a maximum collector current of 2 A and power dissipation of 900 mW. The device is mounted in a TO-92MOD through-hole package.

The 2SA1020-Y-AP is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for systems utilizing this transistor.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	2	A
Voltage - Collector Emitter Breakdown (Max)	50	V
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 1A	—
Current - Collector Cutoff (Max)	1µA (ICBO)	—
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 500mA, 2V	—
Power - Max	900	mW
Frequency - Transition	100	MHz
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-226-3, TO-92-3 Long Body (Formed Leads)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2SA1020-Y-AP is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Transistor polarity: PNP
Maximum collector current: 2 A
Maximum collector-emitter breakdown voltage: 50 V
Saturation voltage: 500mV @ 50mA, 1A
DC current gain (hFE): 120 @ 500mA, 2V
Transition frequency: 100 MHz
Mounting configuration: Through Hole
Package type: TO-92-3 Long Body (Formed Leads)

The KSA1281YTA meets all critical electrical specifications and mechanical compatibility requirements. This substitute maintains functional equivalence for applications requiring PNP transistor operation within the specified voltage, current, and frequency parameters.

Parameter Comparison

Parameter	2SA1020-Y-AP	KSA1281YTA	Match Status
Transistor Type	PNP	PNP	Equivalent
Current - Collector (Ic) (Max)	2 A	2 A	Equivalent
Voltage - Collector Emitter Breakdown (Max)	50 V	50 V	Equivalent
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 1A	500mV @ 50mA, 1A	Equivalent
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 500mA, 2V	120 @ 500mA, 2V	Equivalent
Frequency - Transition	100 MHz	100 MHz	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	TO-226-3, TO-92-3 Long Body (Formed Leads)	TO-226-3, TO-92-3 Long Body (Formed Leads)	Equivalent
Power - Max	900 mW	1 W	Substitute Exceeds
Current - Collector Cutoff (Max)	1µA (ICBO)	100nA (ICBO)	Substitute Exceeds
Product Status	Obsolete	Active	Substitute Active

Engineering Selection Recommendations

The KSA1281YTA manufactured by Fairchild Semiconductor is a direct functional substitute for the 2SA1020-Y-AP. Selection of this substitute is supported by the following factors:

Electrical Equivalence: All critical electrical parameters match or exceed the original specification. The KSA1281YTA maintains identical maximum collector current (2 A), collector-emitter breakdown voltage (50 V), saturation voltage characteristics, DC current gain, and transition frequency.

Mechanical Compatibility: Both devices utilize identical through-hole mounting and TO-92-3 Long Body package configuration, ensuring direct pin-compatible installation without circuit board modification.

Performance Enhancement: The KSA1281YTA provides improved specifications in power dissipation (1 W versus 900 mW) and collector cutoff current (100nA versus 1µA), delivering superior performance margins in the target application.

Product Status and Supply: The KSA1281YTA maintains active product status with established supply availability, addressing the obsolescence of the original 2SA1020-Y-AP.

Compliance: The KSA1281YTA is ROHS3 compliant, maintaining regulatory alignment with modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the KSA1281YTA be used as a direct replacement for the 2SA1020-Y-AP without circuit modification?

A: Yes. The KSA1281YTA is pin-compatible and electrically equivalent across all critical parameters. No circuit board layout changes or component rework is required for substitution.

Q: What are the key electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by matching transistor polarity (PNP), maximum collector current (2 A), collector-emitter breakdown voltage (50 V), saturation voltage (500mV @ 50mA, 1A), DC current gain (120 @ 500mA, 2V), and transition frequency (100 MHz).

Q: Does the higher power rating of the KSA1281YTA (1 W versus 900 mW) affect circuit operation?

A: No. The higher power rating of the KSA1281YTA represents an improvement that provides additional thermal margin. This does not negatively impact circuit performance and supports enhanced reliability in power-dissipation-limited applications.

Q: Are there any package or mounting differences between these devices?

A: No. Both the 2SA1020-Y-AP and KSA1281YTA utilize identical TO-92-3 Long Body through-hole packages with formed leads, ensuring mechanical and electrical compatibility.

Q: What is the significance of the improved collector cutoff current specification in the KSA1281YTA?

A: The KSA1281YTA exhibits lower collector cutoff current (100nA versus 1µA), indicating reduced leakage current. This characteristic improves performance in applications sensitive to bias current stability and reduces power consumption in standby conditions.

Q: Is the KSA1281YTA available in active production?

A: Yes. The KSA1281YTA maintains active product status, ensuring reliable long-term supply availability and support compared to the obsolete 2SA1020-Y-AP.

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