RN1404,LF Equivalent & Substitute Parts

Part Overview

The RN1404,LF is a pre-biased NPN bipolar transistor (BJT) manufactured by Toshiba Semiconductor and Storage. This surface mount component operates at 50 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and is designed for general-purpose switching and amplification applications. The device features integrated base and emitter-base resistors (47 kOhms each) for simplified circuit design and reduced component count.

The RN1404,LF is classified as an active product with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and functional equivalence within the pre-biased NPN transistor category.

Substiute Parts

RN1404,LF

Toshiba Semiconductor and StorageIn Stock: 5597RN1404,LF Datasheet

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MUN2213T1G

onsemiIn Stock: 59120MUN2213T1G Datasheet

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SMMUN2213LT1G

onsemiIn Stock: 20339SMMUN2213LT1G Datasheet

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SMMUN2213LT3G

onsemiIn Stock: 29140SMMUN2213LT3G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RN1404,LF are qualified based on the following electrical and mechanical criteria:

Primary Substitution 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
• Surface mount packaging: TO-236-3, SC-59, or SOT-23-3
• RoHS3 compliance
• MSL rating: 1 (Unlimited)

All identified substitute parts meet these core electrical specifications and are functionally equivalent to the RN1404,LF. Variations in power dissipation rating, saturation voltage characteristics, and packaging format (tape & reel versus cut tape) do not affect functional substitution within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

All three onsemi substitute parts (MUN2213T1G, SMMUN2213LT1G, SMMUN2213LT3G) are functionally equivalent to the RN1404,LF and meet the core electrical and mechanical requirements for direct substitution.

MUN2213T1G: This part is supplied in tape & reel packaging with SC-59 package designation. It provides higher power dissipation capability (338 mW) compared to the RN1404,LF (200 mW), making it suitable for applications requiring additional thermal margin. All electrical parameters remain within specification.

SMMUN2213LT1G: This part is supplied in cut tape & Digi-Reel format with SOT-23-3 (TO-236) package designation. It carries automotive-grade qualification (AEC-Q101) and is suitable for both commercial and automotive applications. Power dissipation is rated at 246 mW.

SMMUN2213LT3G: This part is supplied in tape & reel packaging with SOT-23-3 (TO-236) package designation. It also carries automotive-grade qualification (AEC-Q101). Power dissipation is rated at 246 mW. This variant is identical in electrical specification to SMMUN2213LT1G with different packaging format.

All substitute parts maintain RoHS3 compliance, unlimited MSL rating, and active product status. Selection between substitutes depends on packaging format requirements (tape & reel versus cut tape) and whether automotive qualification is required for the application.

Frequently Asked Questions (FAQ)

Q: Can MUN2213T1G be used as a direct replacement for RN1404,LF?

A: Yes. The MUN2213T1G meets all core electrical specifications including collector current (100 mA), breakdown voltage (50 V), integrated resistor values (47 kOhms each), and DC current gain (80 minimum). Both parts are surface mount NPN pre-biased transistors with identical package compatibility (TO-236-3, SC-59, SOT-23-3).

Q: What is the difference between SMMUN2213LT1G and SMMUN2213LT3G?

A: Both parts are electrically identical with matching specifications. The primary difference is packaging format: SMMUN2213LT1G is supplied in cut tape & Digi-Reel format, while SMMUN2213LT3G is supplied in tape & reel format. Both carry AEC-Q101 automotive qualification.

Q: Are the onsemi substitutes suitable for automotive applications?

A: SMMUN2213LT1G and SMMUN2213LT3G carry AEC-Q101 automotive qualification and are suitable for automotive applications. MUN2213T1G does not carry automotive qualification but remains functionally equivalent for non-automotive use.

Q: Does the higher power rating of MUN2213T1G (338 mW vs. 200 mW) affect compatibility?

A: No. Higher power dissipation rating indicates greater thermal capability and does not affect functional compatibility. The MUN2213T1G can be used in any application designed for the RN1404,LF without modification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts (MUN2213T1G, SMMUN2213LT1G, SMMUN2213LT3G) are RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1), matching the RN1404,LF compliance profile.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes, within package footprint constraints. All parts use TO-236-3, SC-59, or SOT-23-3 packages with identical pin configurations. Verify that the specific package variant selected matches the PCB footprint design.

Q: What is the significance of the 47 kOhm integrated resistors?

A: The 47 kOhm base resistor (R1) and emitter-base resistor (R2) are internal to the pre-biased transistor package. All substitute parts maintain these identical resistor values, ensuring equivalent biasing behavior and circuit performance without external resistor modifications.