2SD2138APA Equivalent & Substitute Parts

Part Overview

The 2SD2138APA is a Bipolar (BJT) NPN Darlington transistor manufactured by Panasonic Electronic Components, designed for applications requiring moderate current switching and amplification. This component features an 80 V collector-emitter breakdown voltage rating and a maximum collector current of 2 A, with a 15 W power dissipation capability in a Through Hole MT-4-A1 package configuration.

The 2SD2138APA is classified as an obsolete product. Locating equivalent substitute components is necessary for ongoing system maintenance, repair operations, and new design implementations where legacy component specifications must be matched or exceeded.

Substiute Parts

2SD2138APA

Panasonic Electronic ComponentsIn Stock: 10882SD2138APA Datasheet

Current PartRFQ

TIP112

Solid State Inc.In Stock: 21593TIP112 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2SD2138APA is determined by strict electrical and mechanical parameter matching within the NPN Darlington transistor category. The following parameters establish substitution eligibility:

Critical Matching Parameters:

• Transistor Type: NPN - Darlington configuration
• Maximum Collector Current (Ic): 2 A or greater
• Collector-Emitter Breakdown Voltage: 80 V or greater
• Vce Saturation characteristics: 2.5 V @ 8mA, 2A or lower
• DC Current Gain (hFE): 1000 or greater at specified operating points
• Mounting Type: Through Hole
• Operating Temperature Range: Must support 150°C maximum junction temperature

The TIP112 qualifies as a substitute component based on these parameters. It maintains the NPN Darlington configuration, supports the required 2 A collector current, exceeds the voltage rating at 100 V, and operates within the specified temperature range. Package differences between MT-4-A1 and TO-220-3 represent a mechanical variation that must be evaluated within the context of the target application's physical constraints.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The 2SD2138APA is classified as obsolete, while the TIP112 maintains active product status. Active status indicates ongoing manufacturing, quality assurance, and availability through authorized distribution channels.

Compliance and Certification: Both components carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture-related handling restrictions. The TIP112 is RoHS3 compliant, meeting current environmental and hazardous substance directives. The 2SD2138APA compliance status for RoHS is not specified in the provided data.

Electrical Performance: The TIP112 exceeds the 2SD2138APA in collector-emitter breakdown voltage (100 V versus 80 V) and maximum power dissipation (50 W versus 15 W). Both components maintain identical saturation voltage characteristics at the specified operating point. The TIP112 exhibits lower DC current gain at the specified test condition (1000 versus 4000), which represents a trade-off in amplification factor but remains within acceptable parameters for Darlington transistor applications.

Mechanical Compatibility: Package differences exist between the MT-4-A1 (3-SIP) and TO-220-3 configurations. Physical board layout, thermal management requirements, and mounting infrastructure must be evaluated for compatibility with the target application.

Frequently Asked Questions (FAQ)

Q: Can the TIP112 directly replace the 2SD2138APA in all applications?

A: Electrical substitution is valid based on matching Darlington configuration, collector current rating, and saturation characteristics. Physical package differences (MT-4-A1 versus TO-220-3) require evaluation of the target application's mechanical constraints, including PCB layout, heatsinking requirements, and available mounting space.

Q: What is the significance of the voltage rating difference between 80 V and 100 V?

A: The TIP112's higher collector-emitter breakdown voltage (100 V) provides additional margin above the 2SD2138APA's 80 V rating. This represents an improvement in overvoltage tolerance and does not create incompatibility in applications designed for the lower voltage specification.

Q: How do the DC current gain specifications compare?

A: The 2SD2138APA specifies a minimum hFE of 4000 at 2 A and 4 V, while the TIP112 specifies 1000 at 1 A and 4 V. These measurements occur at different collector current levels. The TIP112's lower gain value at 1 A does not preclude substitution, as both components operate within the Darlington transistor performance envelope for switching and amplification applications.

Q: What are the thermal management implications of the power rating difference?

A: The TIP112 supports 50 W maximum power dissipation compared to the 2SD2138APA's 15 W rating. The TO-220 package typically provides superior thermal coupling to external heatsinks compared to the 3-SIP package. Applications operating near the 15 W limit of the original component benefit from the TIP112's enhanced thermal capability.

Q: Are there any compliance or certification differences?

A: The TIP112 is RoHS3 compliant. Both components carry MSL 1 (Unlimited) moisture sensitivity classification. The 2SD2138APA's RoHS compliance status is not specified in the available data and should be verified through the manufacturer if compliance documentation is required.

Q: What package considerations apply to PCB redesign?

A: The MT-4-A1 package uses a 3-SIP (Single In-line Package) configuration, while the TO-220-3 uses a three-lead TO-220 package. Footprint, lead spacing, and mounting hole requirements differ significantly. PCB layout modifications are necessary for mechanical accommodation of the TIP112.