Equivalent & Substitute Parts Reference: 2SC3851A

Part Overview

The Sanken Electric USA Inc. 2SC3851A is an active NPN Bipolar (BJT) transistor designed for power switching and amplification applications. It offers collector-emitter breakdown voltage up to 80 V, maximum collector current of 4 A, and a transition frequency of 15 MHz. The product is packaged in TO-220F for through-hole mounting and is RoHS3 compliant. Identifying suitable equivalent or substitute parts is essential when inventory availability is limited or specific compliance/certification requirements must be met.

Key Parameters

Manufacturer Part Number	Manufacturer	Category	Transistor Type	Current - Collector (Ic) (Max)	Voltage - Collector Emitter Breakdown (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Frequency - Transition	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package	RoHS Status
2SC3851A	Sanken Electric USA Inc.	Transistors, Bipolar (BJT)	NPN	4 A	80 V	500mV @ 200mA, 2A	100µA (ICBO)	40 @ 1A, 4V	25 W	15MHz	150°C (TJ)	Through Hole	TO-220-3 Full Pack	TO-220F	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute relationships in the "Transistors, Bipolar (BJT)" category are determined strictly by matching key parameters. These include transistor type (NPN), collector-emitter breakdown voltage, maximum collector current, current gain, saturation voltage, cutoff current, total power dissipation, transition frequency, package/case specification, mounting type, and compliance status. Alternatives must meet or exceed these minimum criteria without introducing parameters outside the provided set.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Transistor Type	Current - Collector (Ic) (Max)	Voltage - Collector Emitter Breakdown (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Frequency - Transition	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package	RoHS Status
2SC3851A	Sanken Electric USA Inc.	NPN	4 A	80 V	500mV @ 200mA, 2A	100µA (ICBO)	40 @ 1A, 4V	25 W	15MHz	150°C (TJ)	Through Hole	TO-220-3 Full Pack	TO-220F	ROHS3 Compliant
KSD1408YTU	Fairchild Semiconductor	NPN	4 A	80 V	1.5V @ 300mA, 3A	30µA (ICBO)	120 @ 500mA, 5V	25 W	8MHz	150°C (TJ)	Through Hole	TO-220-3 Full Pack	TO-220F-3	-
MJF3055G	onsemi	NPN	10 A	90 V	2.5V @ 3.3A, 10A	1µA	20 @ 4A, 4V	2 W	2MHz	-55°C ~ 150°C (TJ)	Through Hole	TO-220-3 Full Pack	TO-220FP	ROHS3 Compliant

Engineering Selection Recommendations

2SC3851A and MJF3055G possess ROHS3 compliance and are both listed as active status. KSD1408YTU does not indicate ROHS status within the provided data. All parts are available with standard tubes or bulk packaging and meet the stated mounting and case specifications. Certifications such as moisture sensitivity level and ECCN do not restrict selection based on the provided information.

Frequently Asked Questions (FAQ)

Q1: What are the critical parameters when selecting a substitute for 2SC3851A?
A1: Key parameters include transistor type (NPN), collector-emitter breakdown voltage, maximum collector current, current gain, cutoff current, total power dissipation, saturation voltage, transition frequency, package/case, mounting type, and compliance status.

Q2: Are the listed substitutes physically compatible with existing PCBs designed for 2SC3851A?
A2: All parts utilize the TO-220-3 Full Pack package and are designed for through-hole mounting, enabling direct physical substitution based on provided specifications.

Q3: Does RoHS compliance affect substitute selection?
A3: If RoHS compliance is a requirement, only models with explicit ROHS3 status, such as 2SC3851A and MJF3055G, should be selected according to the provided data.

Q4: Are there differences in electrical performance between these alternatives?
A4: Differences in current gain, saturation voltage, and transition frequency exist. Component selection should be made strictly according to the parameters listed in the table.

Q5: How should electrical compatibility be evaluated between listed substitute parts?
A5: Compare only the common parameters such as voltage, current, gain, cutoff current, power, and frequency. Select alternatives that meet or exceed the required performance in all provided fields.

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