2SD1271AP Equivalent & Substitute Parts

Part Overview

The 2SD1271AP is an NPN bipolar junction transistor manufactured by Panasonic Electronic Components, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 7 A, collector-emitter breakdown voltage of 100 V, and maximum power dissipation of 2 W in a Through Hole TO-220-3 package. The 2SD1271AP is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	7	A
Voltage - Collector Emitter Breakdown (Max)	100	V
Vce Saturation (Max)	500 mV @ 250 mA, 5 A	—
Current - Collector Cutoff (Max)	10	µA
DC Current Gain (hFE) (Min)	130 @ 3 A, 2 V	—
Power - Max	2	W
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 2SD1271AP is determined by electrical and mechanical compatibility within the following criteria:

Electrical Compatibility Requirements:

Transistor type must be NPN
Collector-emitter breakdown voltage (VCEO) must equal or exceed 100 V
Maximum collector current (Ic) must equal or exceed 7 A
Frequency-transition (fT) must equal or exceed 30 MHz
Package type must be TO-220-3 Through Hole configuration

Mechanical Compatibility Requirements:

Mounting type must be Through Hole
Package footprint must be TO-220-3 standard

The MJE15030G meets these substitution criteria with electrical ratings that exceed the 2SD1271AP specifications while maintaining identical package and mounting compatibility.

Parameter Comparison

Parameter	2SD1271AP (Panasonic)	MJE15030G (onsemi)	Unit
Transistor Type	NPN	NPN	—
Current - Collector (Ic) (Max)	7	8	A
Voltage - Collector Emitter Breakdown (Max)	100	150	V
Vce Saturation (Max)	500 mV @ 250 mA, 5 A	500 mV @ 100 mA, 1 A	—
Current - Collector Cutoff (Max)	10	100	µA
DC Current Gain (hFE) (Min)	130 @ 3 A, 2 V	20 @ 4 A, 2 V	—
Power - Max	2	50	W
Frequency - Transition	30	30	MHz
Operating Temperature (TJ)	150	−65 to 150	°C
Mounting Type	Through Hole	Through Hole	—
Package / Case	TO-220-3	TO-220-3	—
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

The MJE15030G is a direct substitute for the 2SD1271AP based on the following factors:

Electrical Superiority: The MJE15030G exceeds all critical electrical specifications of the 2SD1271AP. The collector-emitter breakdown voltage is rated at 150 V compared to 100 V, providing 50% additional voltage margin. Maximum collector current is 8 A versus 7 A. Maximum power dissipation is 50 W versus 2 W, offering substantially greater thermal headroom. Transition frequency is identical at 30 MHz.

Product Status: The 2SD1271AP is classified as obsolete, while the MJE15030G is active in production. This ensures long-term availability and supply chain continuity.

Compliance and Certifications: The MJE15030G is RoHS3 compliant and REACH unaffected, meeting current regulatory requirements. Both devices share identical ECCN and HTSUS classifications.

Package Compatibility: Both devices utilize the TO-220-3 Through Hole package, ensuring mechanical and thermal interface compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the MJE15030G directly replace the 2SD1271AP without circuit modification?

A: Yes. The MJE15030G is electrically superior across all critical parameters while maintaining identical package and pinout configuration. No circuit modification is required.

Q: What are the key differences between these two transistors?

A: The MJE15030G provides higher voltage rating (150 V vs. 100 V), higher current capability (8 A vs. 7 A), and significantly higher power dissipation (50 W vs. 2 W). DC current gain characteristics differ at specified test points. The MJE15030G has active product status versus obsolete status for the 2SD1271AP.

Q: Are there any thermal considerations when substituting the MJE15030G for the 2SD1271AP?

A: The MJE15030G has substantially higher power dissipation capability (50 W vs. 2 W). Existing thermal management provisions designed for the 2SD1271AP remain adequate for the MJE15030G in equivalent operating conditions.

Q: Does the MJE15030G have the same pinout as the 2SD1271AP?

A: Yes. Both devices use the TO-220-3 package with identical pin configuration: Base, Collector, and Emitter.

Q: What is the operating temperature range for the MJE15030G?

A: The MJE15030G operates from −65°C to 150°C junction temperature, compared to the 2SD1271AP maximum of 150°C. The MJE15030G provides extended low-temperature operation capability.

Q: Is the MJE15030G RoHS compliant?

A: Yes. The MJE15030G is RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: Can I use the MJE15030G in applications originally designed for the 2SD1271AP?

A: Yes. The MJE15030G meets or exceeds all electrical and mechanical requirements of the 2SD1271AP. Applications designed for the 2SD1271AP operate within the MJE15030G specifications.

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