2SC3927 Equivalent & Substitute Parts Reference

Part Overview

The 2SC3927 is a bipolar (BJT) NPN transistor featuring a high collector-emitter voltage rating of 550V, collector current of 10A, and a power dissipation of 120W in a TO-3P-3 (SC-65-3) through-hole package. This device has become obsolete, making it necessary to identify compatible substitute components for continued design support, maintenance, and repair tasks.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	550 V
Current - Collector (Ic) (Max)	10 A
Power - Max	120 W
Vce Saturation (Max) @ Ib, Ic	500mV @ 1A, 5A
Operating Temperature	150°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-3P-3, SC-65-3
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Permissible substitutes for the 2SC3927 are identified exclusively on matching or exceeding critical specifications: transistor type (NPN), mounting type (through hole), and package style compatibility. Electrical parameters used for determining equivalency include maximum collector-emitter voltage (Vce), maximum collector current (Ic), maximum power dissipation, Vce(sat) characteristics, maximum operating temperature, and compliance ratings. Only parts strictly matching or exceeding these parameters are listed as equivalents.

Parameter Comparison

Parameter	2SC3927	BUF420AW
Transistor Type	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	550 V	450 V
Current - Collector (Ic) (Max)	10 A	30 A
Power - Max	120 W	200 W
Vce Saturation (Max) @ Ib, Ic	500mV @ 1A, 5A	500mV @ 4A, 20A
Operating Temperature	150°C (TJ)	150°C (TJ)
Mounting Type	Through Hole	Through Hole
Package / Case	TO-3P-3, SC-65-3	TO-247-3
RoHS Status	RoHS Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The 2SC3927 is currently obsolete, while the BUF420AW is active. Both parts meet RoHS compliance requirements and have an unlimited MSL rating (MSL 1). The BUF420AW is supplied by STMicroelectronics in the TO-247-3 through-hole package, differing from the TO-3P-3 package of the 2SC3927. Obsolescence status and compliance should be taken into account for long-term sourcing and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: What determines if a BJT transistor can be used as a substitute?
A: Substitution is based strictly on matching transistor type (NPN), collector-emitter voltage rating (Vce), collector current capability (Ic), power dissipation (Pmax), mounting type, and package compatibility. Regulatory compliance and MSL ratings are also considered.

Q: Are the package types of 2SC3927 and BUF420AW compatible?
A: The 2SC3927 uses a TO-3P-3 (SC-65-3) package, whereas the BUF420AW uses a TO-247-3 package. Users must verify mechanical compatibility when changing packages.

Q: Does the BUF420AW exceed all electrical parameters of the 2SC3927?
A: The BUF420AW exceeds collector current and power dissipation but has a lower voltage rating (450V versus 550V).

Q: What is the regulatory status of the substitute part?
A: The BUF420AW is ROHS3 compliant with MSL 1 (unlimited) and is classified as active.

Q: Why is a substitute necessary for the 2SC3927?
A: The 2SC3927 is obsolete, so a substitute is required for ongoing support, repairs, and new designs.

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