Equivalent & Substitute Parts for 2SA1038STPS

Part Overview

The 2SA1038STPS, manufactured by Rohm Semiconductor, is a PNP bipolar junction transistor (BJT) with a maximum voltage rating of 120 V and a collector current of up to 50 mA. The transistor is designed for through-hole mounting and offers a frequency transition of 140 MHz and maximum power dissipation of 300 mW. The product is currently listed as obsolete, making the identification of equivalent and substitute parts necessary for uninterrupted production and maintenance.

Key Parameters

Parameter	Value
Transistor Type	PNP
Voltage - Collector Emitter Breakdown (Max)	120 V
Current - Collector (Ic) (Max)	50 mA
Vce Saturation (Max) @ Ib, Ic	500mV @ 1mA, 10mA
Current - Collector Cutoff (Max)	500nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	180 @ 2mA, 6V
Power - Max	300 mW
Frequency - Transition	140MHz
Operating Temperature	150°C (TJ)
Mounting Type	Through Hole
Package / Case	SC-72 Formed Leads
Supplier Device Package	SPT
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitutes for 2SA1038STPS are identified strictly by matching essential parameters critical for electrical and mechanical compatibility in the Transistors, Bipolar (BJT) category. The following parameters are used to define acceptable substitutes: transistor type (PNP), maximum collector-emitter voltage rating (120V), maximum collector current (minimum 50 mA), Vce saturation, maximum collector cutoff current, minimum DC current gain at comparable test conditions, maximum power dissipation, transition frequency, operating temperature, mounting type (through hole), and package/lead form factor. Only parts meeting these criteria are considered as valid equivalents.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Transistor Type	Vce (Max)	Ic (Max)	Vce Sat (Max) @ Ib, Ic	ICBO (Max)	DC Current Gain hFE (Min) @ Ic, Vce	Power (Max)	Frequency - Transition	Operating Temp (TJ)	Mounting Type	Package / Case	RoHS Status	REACH Status
2SA1038STPS	Rohm Semiconductor	PNP	120 V	50 mA	500mV @ 1mA, 10mA	500nA	180 @ 2mA, 6V	300 mW	140MHz	150°C	Through Hole	SC-72 Formed Leads	ROHS3 Compliant	REACH Unaffected
KSA916YTA	Fairchild Semiconductor	PNP	120 V	800 mA	1V @ 50mA, 500mA	100nA	100 @ 100mA, 5V	900 mW	120MHz	150°C	Through Hole	TO-226-3, TO-92-3 Long Body (Formed Leads)	-	-
KSA992FATA	onsemi	PNP	120 V	50 mA	300mV @ 1mA, 10mA	1µA	200 @ 1mA, 6V	500 mW	100MHz	150°C	Through Hole	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	ROHS3 Compliant	REACH Unaffected
KSA992FBTA	Fairchild Semiconductor	PNP	120 V	50 mA	300mV @ 1mA, 10mA	1µA	430 @ 1mA, 6V	500 mW	100MHz	150°C	Through Hole	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	-	REACH Unaffected

Engineering Selection Recommendations

The 2SA1038STPS is classified as an obsolete product. All suggested substitute parts—KSA992FBTA, KSA992FATA, and KSA916YTA—are listed as active products and thus suitable for replacement based on comparable electrical, thermal, and mechanical parameters. Substitute parts that are RoHS3 compliant and listed as REACH unaffected, such as KSA992FATA, offer regulatory and compliance advantages.

Frequently Asked Questions (FAQ)

Q1: What criteria determine valid substitutes for 2SA1038STPS in the Transistors, Bipolar (BJT) category?
A1: Only PNP transistors matching or exceeding the collector-emitter voltage (120 V), collector current rating (≥50 mA), power dissipation, transition frequency, and compatible through-hole packages are considered suitable as substitutes.

Q2: How important is package compatibility when selecting substitutes?
A2: The substitute must use a through-hole package with comparable lead form to ensure fit and mechanical compatibility in circuit board layouts.

Q3: Are RoHS and REACH compliance required for substitution?
A3: Substitute selection can prioritize parts that are RoHS3 compliant and REACH unaffected if compliance with these directives is required in the application.

Q4: Does DC current gain (hFE) need to match exactly?
A4: Substitutes must have a comparable or higher minimum hFE value at defined test conditions to ensure equivalent amplification characteristics.

Q5: Can a higher collector current or power rating be acceptable?
A5: Substitutes with a higher collector current or power rating can be used if all other parameters are compliant with the application's requirements.

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