2SD12660P Equivalent & Substitute Parts

Part Overview

The 2SD12660P is an NPN bipolar junction transistor manufactured by Panasonic Electronic Components, rated for 60 V collector-emitter breakdown voltage and 3 A maximum collector current. This device is packaged in TO-220-3 through-hole configuration and is rated for 2 W maximum power dissipation. The 2SD12660P is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	3	A
Power - Max	2	W
Vce Saturation (Max) @ Ib, Ic	1.2V @ 375mA, 3A	—
Current - Collector Cutoff (Max)	300	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 1A, 4V	—
Frequency - Transition	30	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the 2SD12660P is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): ≥ 60 V
Current - Collector (Ic) (Max): ≥ 3 A
Mounting Type: Through Hole
Package / Case: TO-220-3

Secondary Compatibility Factors:

Vce Saturation characteristics at specified bias conditions
DC Current Gain (hFE) minimum values
Operating temperature range compatibility
Power dissipation capability

Substitute parts are grouped into two categories based on their electrical characteristics relative to the 2SD12660P:

Category A - Direct Equivalents: Parts with matching or closely aligned collector current (3 A), voltage rating (60 V), and saturation characteristics. These include 2ST31A and TIP31A.

Category B - Higher Performance Alternatives: Parts with higher collector current ratings (6 A to 15 A) or enhanced power dissipation capabilities, suitable for applications requiring design margin or higher current handling. These include D44H8, MJE3055T, MJE3055TG, and TIP41AG.

Category C - Partial Compatibility: Parts with reduced current ratings or incomplete parameter specifications, requiring application-specific evaluation. These include 2N6292G, 2N6487G, TIP29A, and TIP29AG.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [A]	Vce(br) [V]	Power [W]	Vce Sat @ Ib, Ic	hFE (Min) @ Ic, Vce	Package	Status
2SD12660P	Panasonic	3	60	2	1.2V @ 375mA, 3A	120 @ 1A, 4V	TO-220-3	Obsolete
2ST31A	STMicroelectronics	3	60	40	1.2V @ 375mA, 3A	100 @ 20mA, 4V	TO-220-3	Active
TIP31A	Solid State Inc.	3	60	40	1.2V @ 375mA, 3A	25 @ 1A, 4V	TO-220-3	Active
D44H8	STMicroelectronics	10	60	50	1V @ 400mA, 8A	40 @ 4A, 1V	TO-220-3	Active
MJE3055T	NTE Electronics, Inc	10	60	75	8V @ 3.3A, 10A	20 @ 4A, 4V	TO-220-3	Active
MJE3055TG	onsemi	10	60	75	8V @ 3.3A, 10A	20 @ 4A, 4V	TO-220-3	Active
TIP41AG	onsemi	6	60	2	1.5V @ 600mA, 6A	15 @ 3A, 4V	TO-220-3	Last Time Buy
2N6292G	onsemi	7	70	40	3.5V @ 3A, 7A	30 @ 2A, 4V	TO-220-3	Active
2N6487G	onsemi	15	60	1.8	3.5V @ 5A, 15A	20 @ 5A, 4V	TO-220-3	Active
TIP29A	Solid State Inc.	—	—	—	—	—	TO-220-3	Active
TIP29AG	onsemi	1	60	2	700mV @ 125mA, 1A	15 @ 1A, 4V	TO-220-3	Active

Engineering Selection Recommendations

For Direct Replacement (Equivalent Performance):

The 2ST31A is the primary equivalent substitute for the 2SD12660P. Both devices share identical collector current (3 A), voltage rating (60 V), and saturation voltage characteristics (1.2 V @ 375 mA, 3 A). The 2ST31A is manufactured by STMicroelectronics, carries Active product status, and holds ROHS3 compliance. The increased power rating (40 W versus 2 W) provides additional thermal margin without affecting circuit operation.

The TIP31A offers equivalent electrical performance with matching current and voltage specifications. This device is manufactured by Solid State Inc., maintains Active status, and includes ROHS3 compliance. The higher power dissipation capability (40 W) supports thermal design flexibility.

For Enhanced Performance Applications:

The D44H8 (STMicroelectronics) supports 10 A collector current at 60 V with 50 W power dissipation. This device is suitable for applications requiring design margin above the 3 A specification or where thermal performance is critical. Active status and ROHS3 compliance are confirmed.

The MJE3055T and MJE3055TG both support 10 A collector current with 75 W power dissipation. These devices are appropriate for high-reliability applications or designs requiring substantial current headroom. Both maintain Active status and ROHS3 compliance.

For Current-Limited Applications:

The TIP41AG (onsemi) supports 6 A collector current at 60 V, positioned between the 3 A base specification and higher-current alternatives. This device carries Last Time Buy status, indicating limited future availability.

Devices Requiring Application-Specific Evaluation:

The 2N6292G (onsemi) provides 70 V voltage rating with 7 A current capability, exceeding the 2SD12660P specification. The 2N6487G (onsemi) supports 15 A at 60 V but exhibits reduced power rating (1.8 W), requiring thermal analysis for specific applications.

The TIP29A lacks complete electrical parameter documentation and requires datasheet verification before selection. The TIP29AG supports only 1 A collector current, making it unsuitable for direct replacement.

Frequently Asked Questions (FAQ)

Q: Can the 2ST31A directly replace the 2SD12660P in all applications?

A: The 2ST31A is electrically equivalent to the 2SD12660P for the specified parameters: 3 A collector current, 60 V breakdown voltage, and 1.2 V saturation voltage at rated conditions. Both devices use TO-220-3 through-hole packaging. The 2ST31A is manufactured by STMicroelectronics and maintains Active product status, whereas the 2SD12660P is obsolete. The 2ST31A is suitable for direct replacement in existing designs.

Q: What is the difference between the 2ST31A and TIP31A?

A: Both devices share identical electrical specifications: 3 A collector current, 60 V voltage rating, and 1.2 V saturation voltage at 375 mA base current and 3 A collector current. Both use TO-220-3 packaging. The primary difference is manufacturer: 2ST31A is manufactured by STMicroelectronics, while TIP31A is manufactured by Solid State Inc. Both maintain Active product status and ROHS3 compliance.

Q: When should I select a higher-current device like the D44H8 or MJE3055T?

A: Higher-current devices (10 A rating) are selected when the application requires design margin above the 3 A specification, when thermal performance is critical, or when the circuit topology benefits from lower saturation voltage at higher current levels. These devices maintain the same 60 V voltage rating and TO-220-3 packaging as the 2SD12660P. Selection depends on circuit requirements, not on automatic substitution.

Q: Are all substitute parts ROHS3 compliant?

A: The 2ST31A, D44H8, MJE3055T, MJE3055TG, TIP31A, TIP41AG, 2N6292G, 2N6487G, TIP29A, and TIP29AG all carry ROHS3 compliance. This compliance status is confirmed in the provided specifications.

Q: What is the significance of the TO-220-3 package specification?

A: The TO-220-3 package is a through-hole configuration with three leads (collector, base, emitter). All substitute parts listed maintain this package type, ensuring mechanical and electrical compatibility with existing PCB layouts and thermal management solutions designed for the 2SD12660P.

Q: Why does the 2N6487G have a lower power rating (1.8 W) despite supporting 15 A collector current?

A: The 2N6487G power rating reflects the maximum continuous power dissipation under specified thermal conditions. The 15 A current rating indicates maximum instantaneous current capability. Applications using this device must verify that actual power dissipation remains within the 1.8 W limit through circuit analysis and thermal modeling.

Q: Can I use the TIP29AG as a substitute for the 2SD12660P?

A: The TIP29AG supports only 1 A maximum collector current, which is below the 2SD12660P specification of 3 A. This device is not suitable for direct replacement in applications requiring 3 A operation.

Q: What does "Last Time Buy" status mean for the TIP41AG?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this device. Existing inventory may be available, but future procurement is not guaranteed. For new designs, selection of devices with Active status (such as 2ST31A or TIP31A) is recommended to ensure long-term supply availability.

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