2SD1264AP Equivalent & Substitute Parts

Part Overview

The 2SD1264AP 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 2 A, collector-emitter breakdown voltage of 180 V, and maximum power dissipation of 2 W in a Through Hole TO-220-3 package. The 2SD1264AP is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support, maintenance, and production continuity. Active alternative components with comparable electrical characteristics and identical packaging are available from alternative manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	2	A
Voltage - Collector Emitter Breakdown (Max)	180	V
Vce Saturation (Max) @ Ib, Ic	1 V @ 50 mA, 500 mA	—
Current - Collector Cutoff (Max)	50	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150 mA, 10 V	—
Power - Max	2	W
Frequency - Transition	20	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the 2SD1264AP is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN configuration required
Mounting Type: Through Hole only
Package / Case: TO-220-3 Full Pack or TO-220 compatible
Current - Collector (Ic) (Max): Must equal or exceed 2 A
Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 180 V
Power - Max: Must equal or exceed 2 W

Secondary Compatibility Parameters:

Vce Saturation characteristics
DC Current Gain (hFE) specifications
Operating Temperature range
Frequency - Transition capability

The substitute parts listed below satisfy all primary substitution criteria and maintain electrical compatibility within the specified application envelope. Substitute parts may exceed the original specifications in one or more parameters; such exceedance does not preclude substitution provided all minimum requirements are met.

Parameter Comparison

Parameter	2SD1264AP (Main)	2SC4381 (Substitute)	BU406G (Substitute)
Manufacturer	Panasonic Electronic Components	Sanken Electric USA Inc.	onsemi
Product Status	Obsolete	Active	Active
Transistor Type	NPN	NPN	NPN
Current - Collector (Ic) (Max)	2 A	2 A	7 A
Voltage - Collector Emitter Breakdown (Max)	180 V	150 V	200 V
Vce Saturation (Max) @ Ib, Ic	1 V @ 50 mA, 500 mA	1 V @ 70 mA, 700 mA	1 V @ 500 mA, 5 A
Current - Collector Cutoff (Max)	50 µA	10 µA	5 mA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150 mA, 10 V	60 @ 700 mA, 10 V	Not specified
Power - Max	2 W	25 W	60 W
Frequency - Transition	20 MHz	15 MHz	10 MHz
Operating Temperature (TJ)	150 °C	150 °C	−65 °C to 150 °C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

2SC4381 (Sanken Electric USA Inc.)

The 2SC4381 is an active product with ROHS3 compliance. This substitute meets the primary substitution criteria with matched collector current (2 A) and identical TO-220-3 packaging. The collector-emitter breakdown voltage of 150 V is below the original 180 V specification; however, this characteristic does not preclude substitution in applications where the actual operating voltage remains within the 150 V envelope. The 2SC4381 provides superior power dissipation capability (25 W versus 2 W) and improved cutoff current characteristics (10 µA versus 50 µA). This part is suitable for direct substitution in applications operating at or below 150 V collector-emitter voltage.

BU406G (onsemi)

The BU406G is an active product with ROHS3 compliance and extended operating temperature range (−65 °C to 150 °C). This substitute exceeds all primary substitution criteria with higher collector current (7 A), higher collector-emitter breakdown voltage (200 V), and significantly higher power dissipation (60 W). The BU406G is suitable for applications requiring higher current capacity or higher voltage operation than the original 2SD1264AP. The TO-220-3 package maintains mechanical compatibility. This part is suitable for direct substitution in all applications where the 2SD1264AP was specified, with particular advantage in designs requiring enhanced thermal performance or higher current capability.

Both substitute parts are available in active production status with current inventory, ensuring long-term supply continuity compared to the obsolete 2SD1264AP.

Frequently Asked Questions (FAQ)

Q: Can the 2SC4381 be used in all applications where the 2SD1264AP was originally specified?

A: The 2SC4381 is suitable for substitution in applications where the collector-emitter voltage does not exceed 150 V. The original 2SD1264AP specification of 180 V breakdown voltage is not matched by the 2SC4381. Applications operating at voltages between 150 V and 180 V require the BU406G or equivalent higher-voltage device.

Q: What is the primary advantage of the BU406G over the 2SC4381?

A: The BU406G provides higher collector-emitter breakdown voltage (200 V), higher maximum collector current (7 A), and higher power dissipation capability (60 W). These characteristics make the BU406G suitable for applications requiring higher voltage operation or greater current handling than the 2SC4381.

Q: Are the substitute parts mechanically compatible with the original 2SD1264AP?

A: Yes. Both the 2SC4381 and BU406G utilize the TO-220-3 package, which is mechanically identical to the original 2SD1264AP TO-220-3 Full Pack. Direct board-level substitution is possible without modification to PCB layouts or mounting hardware.

Q: What is the significance of RoHS compliance for these substitute parts?

A: Both substitute parts (2SC4381 and BU406G) are ROHS3 compliant, whereas the original 2SD1264AP is non-compliant. For applications subject to RoHS regulations or customer requirements, the substitute parts provide regulatory compliance. The original part may be retained only in applications explicitly exempted from RoHS requirements.

Q: Can the BU406G be used as a direct replacement in low-current applications originally designed for the 2SD1264AP?

A: Yes. The BU406G exceeds all electrical specifications of the 2SD1264AP and is suitable for direct substitution in all applications. The higher current and power ratings do not create incompatibility in lower-current designs; the device operates within its safe operating area at reduced current levels.

Q: What inventory status should be considered when selecting between substitute parts?

A: Both substitute parts are available in active production with current inventory: 2SC4381 (1900 Pcs) and BU406G (1427 Pcs). Selection should be based on electrical requirements rather than inventory status, as both parts maintain adequate stock levels for production continuity.

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