2SD2012 Equivalent & Substitute Parts

Part Overview

The 2SD2012 is an NPN bipolar junction transistor manufactured by STMicroelectronics, designed for general-purpose switching and amplification applications. The device is rated for 60 V collector-emitter breakdown voltage, 3 A maximum collector current, and 25 W power dissipation in a Through Hole TO-220-3 package. The 2SD2012 is classified as obsolete, necessitating identification of active equivalent components for new designs and ongoing production requirements. Substitute parts must maintain electrical and mechanical compatibility while offering current manufacturing availability.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	3	A
Power - Max	25	W
Frequency - Transition	3	MHz
Vce Saturation (Max) @ Ib, Ic	1 V @ 200 mA, 2 A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 500 mA, 5 V	—
Current - Collector Cutoff (Max)	100	µA
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3 Full Pack	—

Substitute Part Grouping Explanation

Substitute parts for the 2SD2012 are identified based on strict electrical and mechanical parameter matching. The substitution criteria are:

Transistor Type: NPN configuration required
Voltage Rating: Collector-emitter breakdown voltage of 60 V (minimum)
Current Rating: Maximum collector current of 3 A (minimum)
Power Dissipation: 25 W maximum power rating (minimum)
Frequency Response: Transition frequency of 3 MHz (minimum)
Saturation Characteristics: Vce saturation at 1 V @ 200 mA, 2 A
Mounting Configuration: Through Hole TO-220-3 package
Operating Temperature: 150°C maximum junction temperature

The KSD2012GTU manufactured by Fairchild Semiconductor meets all specified electrical parameters and package requirements, qualifying as a direct substitute for the obsolete 2SD2012.

Parameter Comparison

Parameter	2SD2012 (STMicroelectronics)	KSD2012GTU (Fairchild Semiconductor)	Match Status
Transistor Type	NPN	NPN	Match
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	Match
Current - Collector (Ic) (Max)	3 A	3 A	Match
Power - Max	25 W	25 W	Match
Frequency - Transition	3 MHz	3 MHz	Match
Vce Saturation (Max) @ Ib, Ic	1 V @ 200 mA, 2 A	1 V @ 200 mA, 2 A	Match
Current - Collector Cutoff (Max)	100 µA	100 µA	Match
Operating Temperature (TJ)	150°C	150°C	Match
Mounting Type	Through Hole	Through Hole	Match
Package / Case	TO-220-3 Full Pack	TO-220-3 Full Pack	Match
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 500 mA, 5 V	150 @ 500 mA, 5 V	Substitute Exceeds

Engineering Selection Recommendations

The KSD2012GTU is a qualified substitute for the obsolete 2SD2012 based on electrical parameter equivalence and package compatibility. All critical specifications—voltage rating, current capacity, power dissipation, frequency response, and saturation characteristics—are identical between the two devices.

The KSD2012GTU exhibits a higher minimum DC current gain (hFE) of 150 compared to the 2SD2012's 100, representing an improvement in transistor performance. This higher gain does not compromise compatibility and may provide enhanced switching efficiency in applications requiring base current control.

The KSD2012GTU maintains active product status with current manufacturing availability (3098 pcs in stock), whereas the 2SD2012 is obsolete. The substitute part is REACH Affected, indicating compliance with regulatory requirements for new component selection.

Frequently Asked Questions (FAQ)

Q: Can the KSD2012GTU directly replace the 2SD2012 in existing circuit designs?

A: Yes. The KSD2012GTU meets all electrical specifications and package requirements of the 2SD2012. Pin configuration, voltage ratings, current capacity, and power dissipation are identical. Direct substitution is supported without circuit modification.

Q: What is the significance of the higher DC current gain in the KSD2012GTU?

A: The KSD2012GTU specifies a minimum hFE of 150 at 500 mA and 5 V, compared to 100 for the 2SD2012. Higher current gain indicates improved transistor efficiency and may reduce base drive requirements in switching applications. This parameter difference does not affect substitution compatibility.

Q: Are there package differences between the 2SD2012 and KSD2012GTU?

A: Both devices use the TO-220-3 Full Pack configuration for Through Hole mounting. Physical dimensions, pin spacing, and thermal characteristics are equivalent. No PCB layout modifications are required.

Q: Why is the 2SD2012 classified as obsolete?

A: The 2SD2012 is no longer in active production by STMicroelectronics. The KSD2012GTU from Fairchild Semiconductor provides equivalent functionality with current manufacturing support and availability.

Q: What compliance certifications apply to the KSD2012GTU?

A: The KSD2012GTU is REACH Affected, indicating compliance with European Union chemical substance regulations. Moisture Sensitivity Level is vendor-defined. Verify specific compliance requirements for your application environment.

Q: Are there inventory considerations when selecting between these parts?

A: The 2SD2012 has 23,807 pcs in stock (obsolete status), while the KSD2012GTU has 3,098 pcs available. For new designs and long-term production, the KSD2012GTU is the recommended selection due to active product status and ongoing manufacturing support.

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