2SC1741ASTPR Equivalent & Substitute Parts Reference

Part Overview

The 2SC1741ASTPR, manufactured by Rohm Semiconductor, is a bipolar NPN junction transistor rated at 50 V and 500 mA, packaged in an SPT (SC-72) through-hole case. This device features a maximum collector dissipation of 300 mW, a transition frequency of 250 MHz, and a DC current gain of 120 (min) at 100 mA, 3V. As this part is currently classified as Obsolete, identifying suitable electrical and mechanical substitutes in the transistors, bipolar (BJT) category is necessary for maintaining and designing electronic systems where this component was initially specified.

Key Parameters

Parameter	2SC1741ASTPR
Transistor Type	NPN
Current - Collector (Ic) (Max)	500 mA
Voltage - Collector Emitter Breakdown (Max)	50 V
Vce Saturation (Max) @ Ib, Ic	400 mV @ 15mA, 150mA
Current - Collector Cutoff (Max)	500 nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 100mA, 3V
Power - Max	300 mW
Frequency - Transition	250 MHz
Operating Temperature	150°C (TJ)
Mounting Type	Through Hole
Package / Case	SC-72
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution between bipolar NPN transistors in this category is determined strictly by matching electrical parameters and mechanical characteristics. The key parameters for candidate selection are:

Transistor Type
Maximum Collector Current
Maximum Collector-Emitter Voltage
Saturation Voltage at specified bias conditions
Maximum Collector Cutoff Current
Minimum DC Current Gain at specified conditions
Maximum Power Dissipation
Transition Frequency
Operating Temperature
Mounting Type and Package Compatibility
Environmental and Product Compliance

Parameter Comparison

Parameter	2SC1741ASTPR (Rohm Semiconductor)	KSC1815YTA (onsemi)
Transistor Type	NPN	NPN
Current - Collector (Ic) (Max)	500 mA	150 mA
Voltage - Collector Emitter Breakdown (Max)	50 V	50 V
Vce Saturation (Max) @ Ib, Ic	400 mV @ 15mA, 150mA	250 mV @ 10mA, 100mA
Current - Collector Cutoff (Max)	500 nA (ICBO)	100 nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 100mA, 3V	70 @ 2mA, 6V
Power - Max	300 mW	400 mW
Frequency - Transition	250 MHz	80 MHz
Operating Temperature	150°C (TJ)	150°C (TJ)
Mounting Type	Through Hole	Through Hole
Package / Case	SC-72	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Obsolete	Active

Engineering Selection Recommendations

The 2SC1741ASTPR is classified as obsolete, while the KSC1815YTA is actively available and meets ROHS3 and REACH compliance. Substitution should take into account the compliance and the current product lifecycle status. Only components with matching environmental certifications and active product status should be used for applications requiring RoHS and REACH compliance.

Frequently Asked Questions (FAQ)

Q1: What parameters must match for substituting 2SC1741ASTPR with another BJT transistor?
A1: The substitute transistor must match or exceed the collector-emitter voltage, collector current, power dissipation, transition frequency, DC current gain, and must utilize a compatible package type and mounting style.

Q2: Is the KSC1815YTA a direct drop-in replacement for 2SC1741ASTPR?
A2: The KSC1815YTA shares the NPN configuration, voltage rating, through-hole mounting, and RoHS/REACH compliance. Package and certain electrical ratings differ and must be considered as per specified parameters.

Q3: Are there any differences in compliance or status between these parts?
A3: The 2SC1741ASTPR is Obsolete, while the KSC1815YTA is an Active product. Both are ROHS3 Compliant and REACH Unaffected.

Q4: What is the impact of different package types in the context of substitution?
A4: The 2SC1741ASTPR uses an SC-72 package, whereas the KSC1815YTA uses a TO-226-3 or TO-92-3 package. Mechanical fit and compatibility should be verified in the context of PCB layout and assembly requirements.

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