RN2403,LF Equivalent & Substitute Parts

Part Overview

The RN2403,LF is a pre-biased PNP bipolar junction transistor (BJT) manufactured by Toshiba Semiconductor and Storage. This surface mount device operates at 50 V maximum collector-emitter breakdown voltage with a maximum collector current of 100 mA, designed for general-purpose switching and amplification applications. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within the same functional category.

Substiute Parts

RN2403,LF

Toshiba Semiconductor and StorageIn Stock: 717RN2403,LF Datasheet

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MMUN2112LT1G

onsemiIn Stock: 42379MMUN2112LT1G Datasheet

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MUN2112T1G

onsemiIn Stock: 35349MUN2112T1G Datasheet

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NSVMMUN2112LT1G

onsemiIn Stock: 1348NSVMMUN2112LT1G Datasheet

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PDTA124ET,215

Nexperia USA Inc.In Stock: 13268PDTA124ET,215 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the RN2403,LF is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Transistor type: PNP - Pre-Biased configuration
• Maximum collector current: 100 mA
• Maximum collector-emitter breakdown voltage: 50 V
• Base resistor (R1): 22 kOhms
• Emitter-base resistor (R2): 22 kOhms
• Maximum collector cutoff current: 500 nA or lower

Mechanical Compatibility Criteria:

• Mounting type: Surface Mount
• Package compatibility: TO-236-3, SC-59, or SOT-23-3 footprints
• RoHS3 compliance
• MSL rating: 1 (Unlimited)

All identified substitute parts meet these criteria and are manufactured by onsemi or Nexperia USA Inc., with active product status and equivalent functional performance within the specified electrical and mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain active product status and full RoHS3 compliance, ensuring long-term availability and regulatory conformance. The onsemi MMUN2112LT1G, MUN2112T1G, and NSVMMUN2112LT1G variants provide direct electrical and mechanical equivalence with increased power dissipation ratings (230–246 mW versus 200 mW), offering enhanced thermal margin in applications operating near maximum power limits.

The Nexperia PDTA124ET,215 provides automotive-grade qualification (AEC-Q100) and is suitable for applications requiring automotive reliability standards. This part exhibits slightly higher collector cutoff current (1 µA maximum) and improved saturation voltage characteristics (150 mV at 500 µA, 10 mA versus 300 mV at 250 µA, 5 mA), making it appropriate for precision switching applications.

Package selection between SOT-23-3 (TO-236) and SC-59 variants depends on PCB layout and assembly process requirements; both are mechanically and electrically equivalent within the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can the RN2403,LF be directly replaced with MMUN2112LT1G in existing designs?

A: Yes. Both parts are PNP pre-biased transistors with identical maximum collector current (100 mA), collector-emitter breakdown voltage (50 V), and base/emitter-base resistor values (22 kOhms each). Both use compatible surface mount packages (TO-236-3, SC-59, SOT-23-3) and meet RoHS3 compliance with MSL 1 rating. The MMUN2112LT1G provides higher power dissipation capability (246 mW versus 200 mW).

Q: What is the difference between MUN2112T1G and MMUN2112LT1G?

A: Both are onsemi pre-biased PNP transistors with identical electrical specifications. The primary difference is the supplier device package designation: MUN2112T1G uses SC-59 packaging, while MMUN2112LT1G uses SOT-23-3 (TO-236) packaging. Electrical performance and pin configuration are equivalent.

Q: Is the PDTA124ET,215 suitable for non-automotive applications?

A: Yes. The PDTA124ET,215 meets all electrical and mechanical requirements for the RN2403,LF application. The automotive-grade qualification (AEC-Q100) and improved saturation voltage characteristics provide additional performance margin. This part is suitable for any application within the specified electrical operating range.

Q: Are there package compatibility concerns when substituting between TO-236-3, SC-59, and SOT-23-3?

A: No. All identified substitute parts support TO-236-3, SC-59, and SOT-23-3 package options. These are mechanically and electrically equivalent footprints for three-pin surface mount transistors. PCB layout and assembly process requirements determine which specific package variant is selected; the choice does not affect electrical performance or substitution validity.

Q: What is the significance of the 500 nA collector cutoff current specification?

A: The maximum collector cutoff current (Icbo) defines the leakage current when the transistor is in the off state. The RN2403,LF specifies 500 nA maximum. The onsemi variants (MMUN2112LT1G, MUN2112T1G, NSVMMUN2112LT1G) maintain this specification. The PDTA124ET,215 specifies 1 µA maximum, which is acceptable for general-purpose switching applications but represents slightly higher leakage. This difference is not significant for most circuit designs.

Q: Can these parts be used interchangeably in high-frequency applications?

A: The RN2403,LF specifies 200 MHz transition frequency. Substitute parts do not provide transition frequency specifications in the available data. Substitution is based on the provided electrical and mechanical parameters. Applications requiring specific frequency response characteristics should be evaluated against manufacturer datasheets for transition frequency and other high-frequency parameters.