RN2109ACT(TPL3) Equivalent & Substitute Parts

Part Overview

The RN2109ACT(TPL3) is an active pre-biased PNP bipolar junction transistor manufactured by Toshiba Semiconductor and Storage. This surface mount device integrates internal biasing resistors (R1: 47 kOhms, R2: 22 kOhms) to simplify circuit design and reduce component count in switching and amplification applications. The device operates at a maximum collector-emitter breakdown voltage of 50 V with a maximum collector current of 80 mA and power dissipation of 100 mW.

The RN2109ACT(TPL3) maintains Active product status with RoHS compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical specifications, internal resistor values, and compatible surface mount packaging to ensure functional interchangeability in target applications.

Substiute Parts

RN2109ACT(TPL3)

Toshiba Semiconductor and StorageIn Stock: 10681RN2109ACT(TPL3) Datasheet

Current PartRFQ

MUN5137T1G

onsemiIn Stock: 819MUN5137T1G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RN2109ACT(TPL3) is determined by strict equivalence of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Transistor polarity and pre-biased configuration (PNP - Pre-Biased)
• Internal base resistor value (R1 = 47 kOhms)
• Internal emitter-base resistor value (R2 = 22 kOhms)
• Maximum collector-emitter breakdown voltage (50 V minimum)
• Maximum collector current rating (≥80 mA)
• Surface mount packaging compatibility
• RoHS and environmental compliance status

The MUN5137T1G from onsemi satisfies all critical matching parameters. Both devices feature identical internal resistor configurations (47 kOhms base, 22 kOhms emitter-base), matching 50 V breakdown voltage ratings, and surface mount form factors. The MUN5137T1G provides enhanced current handling (100 mA maximum) and power dissipation (202 mW maximum) compared to the RN2109ACT(TPL3), making it suitable for applications requiring higher performance margins within the same electrical interface.

Parameter Comparison

Engineering Selection Recommendations

RN2109ACT(TPL3) Selection Criteria:

• Original equipment manufacturer (OEM) specification requirement
• Toshiba supply chain preference or contractual obligation
• CST3 package form factor requirement (SC-101, SOT-883)
• Active product status with established supply chain

MUN5137T1G Selection Criteria:

• onsemi supply chain availability or preferred vendor status
• SC-70 package form factor compatibility (SOT-323)
• Enhanced performance margin requirement (100 mA vs. 80 mA; 202 mW vs. 100 mW)
• ROHS3 compliance requirement
• Active product status with established supply chain

Both devices maintain Active product status and meet RoHS environmental compliance requirements. The MUN5137T1G provides higher current and power ratings within the same electrical interface, offering design flexibility for applications with variable load conditions. Package form factor differences (CST3 vs. SC-70) require PCB layout verification for mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the MUN5137T1G directly replace the RN2109ACT(TPL3) in existing designs?

A: Electrical substitution is valid based on matching internal resistor values (47 kOhms base, 22 kOhms emitter-base), identical 50 V breakdown voltage, and compatible pre-biased PNP configuration. PCB layout modification is required due to package form factor differences (CST3 vs. SC-70). Pin-to-pin compatibility must be verified against the specific PCB footprint.

Q: What are the key differences between these substitute parts?

A: The primary differences are manufacturer (Toshiba vs. onsemi), package type (CST3/SOT-883 vs. SC-70/SOT-323), and performance ratings. The MUN5137T1G provides higher maximum collector current (100 mA vs. 80 mA) and power dissipation (202 mW vs. 100 mW). Both devices share identical internal resistor configurations and 50 V breakdown voltage specifications.

Q: Are there any compliance or certification differences?

A: Both devices are RoHS compliant with unlimited moisture sensitivity (MSL 1). The MUN5137T1G carries ROHS3 compliance designation, while the RN2109ACT(TPL3) is RoHS Compliant. Both devices are classified under ECCN EAR99 and HTSUS 8541.21.0095.

Q: What is the impact of package form factor differences on circuit design?

A: The RN2109ACT(TPL3) uses CST3 packaging (SC-101, SOT-883), while the MUN5137T1G uses SC-70 packaging (SOT-323). These are different surface mount form factors requiring distinct PCB footprints. Mechanical compatibility with existing PCB layouts must be confirmed before substitution. Pin assignments and lead spacing differ between packages.

Q: Can I use the MUN5137T1G in applications where the RN2109ACT(TPL3) is rated at maximum specifications?

A: Yes. The MUN5137T1G exceeds the RN2109ACT(TPL3) in both current (100 mA vs. 80 mA) and power (202 mW vs. 100 mW) ratings while maintaining identical voltage and internal resistor specifications. This provides additional performance margin for applications operating at or near maximum RN2109ACT(TPL3) specifications.

Q: What should be verified before implementing a substitution?

A: Verify PCB footprint compatibility with the SC-70 package form factor, confirm pin assignment alignment, validate thermal management requirements based on the 202 mW power rating, and confirm onsemi supply chain availability and lead time requirements.