2SA1381ESTU Equivalent & Substitute Parts

Part Overview

The 2SA1381ESTU is a PNP bipolar junction transistor manufactured by onsemi, rated for 300 V collector-emitter breakdown voltage and 100 mA maximum collector current. This component is packaged in a TO-126-3 through-hole configuration and is designed for general-purpose switching and amplification applications requiring moderate power dissipation up to 7 W.

The 2SA1381ESTU is classified as obsolete. Locating equivalent or substitute parts is necessary to support ongoing maintenance, repair, and redesign of legacy equipment utilizing this transistor. Direct replacements and functionally similar alternatives are available from the same manufacturer with active product status.

Substiute Parts

2SA1381ESTU

onsemiIn Stock: 11672SA1381ESTU Datasheet

Current PartRFQ

KSA1381ESTU

onsemiIn Stock: 1201KSA1381ESTU Datasheet

DirectRFQ

MJE350G

onsemiIn Stock: 20158MJE350G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 2SA1381ESTU are grouped based on electrical parameter compatibility within the PNP transistor category. The primary substitution criteria are:

1. Transistor Type: Must be PNP configuration
2. Voltage Rating: Collector-emitter breakdown voltage must equal or exceed 300 V
3. Current Rating: Maximum collector current must equal or exceed 100 mA
4. Power Dissipation: Maximum power rating must equal or exceed 7 W
5. Mounting and Package: Through-hole configuration with compatible pinout
6. Operating Temperature Range: Must encompass or exceed -55°C to 150°C

Direct Equivalent: KSA1381ESTU matches all electrical specifications and package requirements of the 2SA1381ESTU while maintaining active product status.

Similar Alternative: MJE350G provides higher current capacity (500 mA) and power rating (20 W) while maintaining the 300 V voltage rating and through-hole TO-126 package. This part is suitable for applications where the original specifications are met but additional design margin is required.

Parameter Comparison

Engineering Selection Recommendations

KSA1381ESTU is the primary substitute for the obsolete 2SA1381ESTU. This part provides identical electrical specifications, package configuration, and pinout compatibility. The KSA1381ESTU maintains active product status and carries ROHS3 compliance certification, making it suitable for direct replacement in legacy equipment maintenance and repair applications.

MJE350G is a functionally compatible alternative when higher current capacity and power dissipation margin are acceptable within the circuit design. The MJE350G exceeds the original specifications in collector current (500 mA versus 100 mA) and power rating (20 W versus 7 W) while maintaining the 300 V voltage rating. The MJE350G is also ROHS3 compliant and carries active product status. However, the lower DC current gain (30 versus 100) and higher collector cutoff current (100 µA versus 100 nA) may require circuit verification in applications sensitive to leakage current or gain characteristics.

All substitute parts are manufactured by onsemi and carry REACH Unaffected status, confirming regulatory compliance for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can KSA1381ESTU be used as a direct replacement for 2SA1381ESTU?

A: Yes. The KSA1381ESTU provides identical electrical specifications, including 300 V breakdown voltage, 100 mA maximum collector current, 7 W power rating, 150 MHz transition frequency, and -55°C to 150°C operating temperature range. The package and pinout are compatible. The primary difference is product status: KSA1381ESTU is active while 2SA1381ESTU is obsolete.

Q: What are the key differences between KSA1381ESTU and MJE350G?

A: KSA1381ESTU matches the 2SA1381ESTU specification exactly. MJE350G provides higher current capacity (500 mA versus 100 mA) and power dissipation (20 W versus 7 W). MJE350G has lower DC current gain (30 versus 100) and higher collector cutoff current (100 µA versus 100 nA). Both maintain 300 V voltage rating and through-hole mounting. MJE350G is suitable when additional design margin is required but circuit behavior dependent on gain or leakage current must be verified.

Q: Are the packages physically compatible?

A: KSA1381ESTU uses TO-126-3 package, identical to the original 2SA1381ESTU. MJE350G uses TO-126 package. Both are through-hole configurations with compatible pinout for PNP transistor applications. Physical board layout compatibility should be confirmed for MJE350G due to potential package dimension variations.

Q: What is the compliance status of these substitute parts?

A: KSA1381ESTU and MJE350G are both ROHS3 compliant and carry REACH Unaffected status. Both parts are suitable for applications requiring regulatory compliance in industrial, commercial, and consumer electronics.

Q: Which substitute should be selected for new designs?

A: For new designs, KSA1381ESTU is recommended when the original 100 mA current and 7 W power specifications are sufficient. MJE350G is recommended when higher current capacity or power dissipation margin is required by the circuit design. Both parts are active products with established supply availability.