2SD1266AP Equivalent & Substitute Parts

Part Overview

The 2SD1266AP is an NPN bipolar junction transistor manufactured by Panasonic Electronic Components, rated for 80 V collector-emitter breakdown voltage and 3 A maximum collector current. This device is packaged in TO-220-3 Full Pack configuration and is designed for through-hole mounting applications. The 2SD1266AP is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support and production continuity. Substitute parts must maintain compatibility with the original electrical specifications and mechanical form factor to ensure direct replacement capability.

Key Parameters

Parameter	2SD1266AP Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	80 V
Current - Collector (Ic) (Max)	3 A
Power - Max	2 W
Vce Saturation (Max) @ Ib, Ic	1.2 V @ 375 mA, 3 A
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 1 A, 4 V
Frequency - Transition	30 MHz
Mounting Type	Through Hole
Package / Case	TO-220-3 Full Pack
Operating Temperature (Max)	150°C (TJ)

Substitute Part Grouping Explanation

Substitute parts for the 2SD1266AP are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Transistor Type: NPN (all substitutes must be NPN)
Voltage - Collector Emitter Breakdown (Max): 80 V (minimum requirement)
Current - Collector (Ic) (Max): 3 A or greater (equal or higher current rating)
Mounting Type: Through Hole
Package / Case: TO-220-3 or TO-220-3 Full Pack

Secondary Compatibility Parameters:

Vce Saturation characteristics
DC Current Gain (hFE)
Operating Temperature range
Product Status (Active status preferred for ongoing availability)

Substitutes are grouped into two categories: Direct Equivalents (matching all critical parameters within tolerance) and Functional Alternatives (meeting or exceeding critical parameters with different secondary characteristics).

Parameter Comparison

Parameter	2SD1266AP	TIP31BG	TIP41BG	2N6488G	2SC3852A	TIP29BG	D44H11
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V	80 V	80 V	80 V	80 V	Not Specified
Current - Collector (Ic) (Max)	3 A	3 A	6 A	15 A	3 A	1 A	Not Specified
Power - Max	2 W	2 W	2 W	1.8 W	25 W	2 W	Not Specified
Vce Saturation (Max) @ Ib, Ic	1.2 V @ 375 mA, 3 A	1.2 V @ 375 mA, 3 A	1.5 V @ 600 mA, 6 A	3.5 V @ 5 A, 15 A	500 mV @ 50 mA, 2 A	700 mV @ 125 mA, 1 A	Not Specified
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 1 A, 4 V	10 @ 3 A, 4 V	15 @ 3 A, 4 V	20 @ 5 A, 4 V	500 @ 500 mA, 4 V	15 @ 1 A, 4 V	Not Specified
Frequency - Transition	30 MHz	3 MHz	3 MHz	5 MHz	15 MHz	3 MHz	Not Specified
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3 Full Pack	TO-220-3	TO-220-3	TO-220-3	TO-220-3 Full Pack	TO-220-3	TO-220-3
Operating Temperature (Max)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	Not Specified
Product Status	Obsolete	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitute: TIP31BG

The TIP31BG manufactured by onsemi is the closest functional equivalent to the 2SD1266AP. It matches all critical electrical parameters: 80 V collector-emitter breakdown voltage, 3 A maximum collector current, 1.2 V Vce saturation at rated conditions, and 150°C maximum operating temperature. The TIP31BG is packaged in TO-220-3 configuration suitable for through-hole mounting. Product status is Active, ensuring long-term availability and supply chain continuity. RoHS3 compliance and REACH Unaffected status provide regulatory alignment for current manufacturing standards.

Secondary Substitute: 2SC3852A

The 2SC3852A manufactured by Sanken Electric USA Inc. provides electrical compatibility with identical voltage and current ratings. This device offers superior power dissipation capability (25 W versus 2 W) and lower Vce saturation (500 mV at 2 A), making it suitable for applications requiring enhanced thermal performance. The 2SC3852A is packaged in TO-220-3 Full Pack, matching the original form factor. Product status is Active with RoHS compliance certification.

Functional Alternative: TIP41BG

The TIP41BG manufactured by onsemi exceeds the current rating requirement with 6 A maximum collector current while maintaining 80 V voltage rating and 150°C operating temperature. This device is suitable for applications where higher current capacity provides design margin. Product status is Active with extensive inventory availability (20,300 pcs).

Functional Alternative: 2N6488G

The 2N6488G manufactured by onsemi provides significantly higher current capacity (15 A) at the same 80 V voltage rating. This device is suitable for high-current applications requiring design margin. Product status is Active with high inventory availability (7,283 pcs). Operating temperature range extends to -65°C, providing broader environmental compatibility.

Not Recommended: TIP29BG

The TIP29BG has reduced maximum collector current (1 A) compared to the 2SD1266AP (3 A) requirement. This device does not meet the minimum current specification and is unsuitable for direct substitution.

Incomplete Data: D44H11

The D44H11 lacks sufficient electrical parameter specification (voltage, current, and frequency data not provided). This device cannot be reliably evaluated for substitution compatibility.

Frequently Asked Questions (FAQ)

Q: Can TIP31BG directly replace 2SD1266AP in existing circuit designs?

A: Yes. The TIP31BG matches all critical electrical parameters of the 2SD1266AP: 80 V collector-emitter breakdown voltage, 3 A maximum collector current, identical Vce saturation characteristics (1.2 V @ 375 mA, 3 A), and TO-220-3 through-hole package. No circuit modifications are required for direct substitution.

Q: What is the difference between TIP31BG and TIP41BG for substitution purposes?

A: Both devices maintain 80 V voltage rating and 150°C operating temperature. The primary difference is maximum collector current: TIP31BG is rated for 3 A (matching the original specification), while TIP41BG is rated for 6 A. TIP41BG provides higher current capacity for applications requiring design margin. Both are suitable substitutes; selection depends on application current requirements.

Q: Why is 2N6488G listed as a substitute if it has 15 A current rating?

A: The 2N6488G exceeds the 3 A requirement, making it a functional alternative for applications where higher current capacity is beneficial. However, the 15 A rating results in higher Vce saturation (3.5 V @ 5 A, 15 A) compared to the original specification (1.2 V @ 375 mA, 3 A). This device is suitable when current margin is prioritized over saturation voltage characteristics.

Q: Are there package compatibility considerations when substituting these devices?

A: All recommended substitutes use TO-220-3 or TO-220-3 Full Pack configuration, compatible with through-hole mounting. Physical pin configuration and thermal interface characteristics are identical. No mechanical modifications to circuit board layouts are required.

Q: What is the significance of the 2SC3852A having 25 W power rating versus 2 W for the original?

A: The 2SC3852A power rating indicates superior thermal dissipation capability. This device can handle higher power levels without exceeding maximum junction temperature. For applications operating at or near the 2 W limit of the original device, the 2SC3852A provides thermal margin. The higher power rating does not affect electrical compatibility; it represents an enhancement for thermally constrained applications.

Q: Why is TIP29BG not recommended as a substitute?

A: The TIP29BG has maximum collector current rating of 1 A, which is below the 2SD1266AP requirement of 3 A. This device cannot reliably handle the specified current levels and does not meet the minimum electrical requirements for substitution.

Q: What compliance certifications should be verified when selecting a substitute?

A: All recommended active substitutes carry RoHS3 compliance and REACH Unaffected status, meeting current regulatory requirements for electronic component manufacturing. These certifications ensure compatibility with modern manufacturing and environmental standards.

Q: Can D44H11 be used as a substitute?

A: The D44H11 lacks complete electrical parameter specification in available documentation. Critical parameters including voltage rating, maximum current, and frequency characteristics are not provided. This device cannot be reliably evaluated for substitution compatibility without complete technical data.

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