2SB1481(TOJS,Q,M) Equivalent & Substitute Parts

Part Overview

The 2SB1481(TOJS,Q,M) is a Bipolar (BJT) Transistor, PNP type, manufactured by Toshiba Semiconductor and Storage. This component is rated for 100 V collector-emitter breakdown voltage and 4 A maximum collector current in a Through Hole TO-220-3 package configuration. The device is classified as Obsolete, necessitating identification of functionally equivalent substitute components for ongoing design support and procurement requirements.

Substiute Parts

2SB1481(TOJS,Q,M)

Toshiba Semiconductor and StorageIn Stock: 11212SB1481(TOJS,Q,M) Datasheet

Current PartRFQ

2SB1258

Sanken Electric USA Inc.In Stock: 3892892SB1258 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2SB1481(TOJS,Q,M) is determined by the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: The substitute component must maintain a Collector-Emitter Breakdown Voltage (VCEO) of 100 V or greater to ensure circuit protection and reliability.

Current Handling Capacity: The substitute must support a maximum collector current (Ic) equal to or exceeding 4 A to accommodate the original circuit's current demands.

Saturation Voltage Characteristics: The Vce saturation specification of 1.5 V @ 6 mA, 3 A establishes the switching performance baseline for substitute selection.

Package Configuration: The Through Hole TO-220-3 package is mandatory for mechanical and thermal compatibility with existing printed circuit board layouts.

Transistor Polarity: PNP polarity is required for circuit topology compatibility.

The 2SB1258 substitute component meets these criteria while offering enhanced specifications in collector current capacity (6 A) and power dissipation (30 W), maintaining full electrical compatibility within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 2SB1258

The 2SB1258 manufactured by Sanken Electric USA Inc. is the designated equivalent for the 2SB1481(TOJS,Q,M). Both components share identical voltage and saturation specifications, ensuring direct functional compatibility. The 2SB1258 provides superior current handling capacity (6 A versus 4 A) and significantly increased power dissipation capability (30 W versus 2 W), offering enhanced thermal margin and operational headroom in applications approaching the original component's current limits.

Both components are classified as Obsolete and carry identical Moisture Sensitivity Level (MSL) ratings of 1 (Unlimited), indicating equivalent handling and storage requirements. The 2SB1258 is RoHS Compliant, providing environmental compliance assurance for new designs and procurement cycles.

The TO-220-3 package configuration is identical between both components, ensuring direct mechanical and thermal interface compatibility with existing circuit board designs without modification to PCB layout or heatsinking arrangements.

Frequently Asked Questions (FAQ)

Q: Can the 2SB1258 directly replace the 2SB1481(TOJS,Q,M) in existing circuits?

A: Yes. Both components maintain identical Collector-Emitter Breakdown Voltage (100 V), Vce saturation characteristics (1.5 V @ 6 mA, 3 A), and TO-220-3 package configuration. The 2SB1258 supports higher collector current (6 A) and power dissipation (30 W), making it suitable for direct substitution in applications operating at or below the original component's specifications.

Q: What is the primary difference between the 2SB1481 and 2SB1258?

A: The 2SB1258 is a Darlington configuration PNP transistor, whereas the 2SB1481 is a standard PNP transistor. The Darlington configuration results in higher DC current gain (1000 @ 3A, 2V versus 2000 @ 3A, 2V for the standard type) and higher collector cutoff current (10 µA versus 2 µA). The 2SB1258 offers substantially higher power handling (30 W versus 2 W) and current capacity (6 A versus 4 A).

Q: Are the package dimensions identical between these components?

A: Both components utilize the TO-220-3 Full Pack configuration in Through Hole mounting type. Package mechanical compatibility is confirmed, allowing direct substitution without PCB layout modification.

Q: What is the significance of the identical Vce saturation specifications?

A: Matching Vce saturation values (1.5 V @ 6 mA, 3 A) ensure equivalent switching performance and voltage drop characteristics during saturation operation. This parameter directly affects circuit timing, power dissipation, and signal integrity in switching applications.

Q: Are there any compliance or certification differences between these components?

A: The 2SB1258 carries RoHS Compliance certification. Both components share identical MSL ratings (1 - Unlimited) and ECCN classification (EAR99), indicating equivalent environmental handling and export compliance status.

Q: Why are both components classified as Obsolete?

A: Both the 2SB1481(TOJS,Q,M) and 2SB1258 are end-of-life products no longer in active production. Obsolete status necessitates substitution planning for long-term design support and procurement continuity.