RN1304,LF Pre-Biased NPN Transistor Equivalent & Substitute Parts

Part Overview

The RN1304,LF is an active pre-biased NPN bipolar junction transistor (BJT) manufactured by Toshiba Semiconductor and Storage. This surface mount device operates at 50 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and is housed in an SC-70 (SOT-323) package. The device is designed for applications requiring integrated base bias resistors, eliminating the need for external biasing networks in compact circuit designs. Substitute parts are necessary when addressing supply chain constraints, inventory availability, or when design specifications permit selection from multiple qualified manufacturers while maintaining electrical and mechanical compatibility.

Substiute Parts

RN1304,LF

Toshiba Semiconductor and StorageIn Stock: 6183RN1304,LF Datasheet

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MUN5213T1G

onsemiIn Stock: 12306MUN5213T1G Datasheet

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SMUN5213T1G

onsemiIn Stock: 47163SMUN5213T1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the RN1304,LF is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Transistor type: NPN pre-biased configuration
• Maximum collector current: 100 mA
• Collector-emitter breakdown voltage: 50 V
• Base resistor (R1): 47 kOhms
• Emitter-base resistor (R2): 47 kOhms
• Minimum DC current gain (hFE): 80
• Maximum collector cutoff current: 500 nA

Mechanical Equivalence Criteria:

• Package type: SC-70 / SOT-323
• Mounting technology: Surface mount
• Tape & Reel packaging format

Compliance Criteria:

• RoHS3 compliance
• Moisture sensitivity level: 1 (Unlimited)

The substitute parts MUN5213T1G and SMUN5213T1G meet all electrical and mechanical requirements for direct substitution. Both devices are manufactured by onsemi and maintain identical pre-biased resistor networks, collector current ratings, and breakdown voltage specifications. The SMUN5213T1G variant includes automotive-grade qualification (AEC-Q101) for applications requiring enhanced reliability standards.

Parameter Comparison

Engineering Selection Recommendations

RN1304,LF (Toshiba Semiconductor and Storage): Select this part for applications where Toshiba device qualification is specified or preferred. The device maintains active product status with full RoHS3 compliance and unlimited moisture sensitivity rating, suitable for standard industrial and consumer applications.

MUN5213T1G (onsemi): This substitute provides equivalent electrical and mechanical performance with active product status and RoHS3 compliance. Selection is appropriate when onsemi component qualification is acceptable and standard industrial reliability requirements are met.

SMUN5213T1G (onsemi): This variant is the appropriate selection for automotive applications or designs requiring AEC-Q101 qualification. The automotive-grade designation indicates enhanced qualification testing and reliability assurance for automotive-grade circuit implementations. All electrical and mechanical parameters remain equivalent to the primary part.

All three devices are active products with confirmed inventory availability and full compliance with RoHS3 environmental standards.

Frequently Asked Questions (FAQ)

Q: Can MUN5213T1G and SMUN5213T1G be used interchangeably with RN1304,LF?

A: Yes. Both onsemi devices meet all electrical and mechanical substitution criteria. The MUN5213T1G and SMUN5213T1G are direct equivalents with identical collector current ratings (100 mA), breakdown voltage (50 V), integrated bias resistor networks (47 kOhms each), and SC-70 package specifications. The SMUN5213T1G includes automotive-grade qualification; selection between standard and automotive variants depends on application requirements.

Q: What are the critical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: (1) NPN pre-biased transistor configuration, (2) maximum collector current of 100 mA, (3) collector-emitter breakdown voltage of 50 V, (4) base and emitter-base resistor values of 47 kOhms each, (5) minimum DC current gain of 80, (6) SC-70/SOT-323 surface mount package, and (7) RoHS3 compliance with MSL-1 rating.

Q: Are there differences in saturation voltage between the main part and substitutes?

A: The RN1304,LF specifies Vce saturation of 300 mV at 250 µA base current and 5 mA collector current. The MUN5213T1G and SMUN5213T1G specify 250 mV at 300 µA base current and 10 mA collector current. These measurements are taken at different operating points; both devices meet the saturation performance requirements for pre-biased transistor applications.

Q: What is the significance of the AEC-Q101 qualification on SMUN5213T1G?

A: AEC-Q101 qualification indicates that the SMUN5213T1G has undergone automotive-grade reliability testing and is approved for use in automotive applications. This qualification is required for automotive circuit designs. The standard MUN5213T1G lacks this designation and is suitable for non-automotive applications.

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

A: The RN1304,LF specifies a transition frequency of 250 MHz. This parameter is provided only for the main part. Both substitute devices are pre-biased transistors designed for switching and logic applications where the integrated bias network is the primary functional requirement. Frequency performance should be evaluated against specific application circuit requirements.

Q: Are all three devices available in Tape & Reel packaging?

A: Yes. The RN1304,LF, MUN5213T1G, and SMUN5213T1G are all supplied in Tape & Reel (TR) format suitable for automated assembly processes.

Q: What is the moisture sensitivity level for these devices?

A: All three devices carry an MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions. These devices do not require special moisture control during storage, handling, or assembly.