RN1404S,LF Equivalent & Substitute Parts

Part Overview

The RN1404S,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 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.

Substitute parts are necessary when the primary manufacturer part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when automotive-grade qualification is mandated for specific applications.

Substiute Parts

RN1404S,LF

Toshiba Semiconductor and StorageIn Stock: 117387RN1404S,LF Datasheet

Current PartRFQ

MMUN2213LT1G

onsemiIn Stock: 104202MMUN2213LT1G 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

Substitution of the RN1404S,LF is determined by strict equivalence of the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Transistor type: NPN - Pre-Biased
• Maximum collector current: 100 mA
• Maximum 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
• Mounting type: Surface Mount
• Package compatibility: TO-236-3, SC-59, or SOT-23-3

All substitute parts listed maintain these electrical specifications and are available in compatible surface mount packages. Variations in power dissipation rating, packaging format (Cut Tape vs. Tape & Reel), and automotive qualification do not affect functional substitution when the above parameters are met.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain full electrical equivalence to the RN1404S,LF across critical parameters including collector current, breakdown voltage, integrated resistor values, and current gain specifications. Selection among substitutes is determined by application requirements and manufacturing constraints:

MMUN2213LT1G (onsemi): Direct electrical equivalent supplied in Cut Tape & Digi-Reel packaging. Suitable for standard commercial applications requiring SOT-23-3 package format. ROHS3 compliant with unlimited moisture sensitivity rating.

MUN2213T1G (onsemi): Direct electrical equivalent supplied in Tape & Reel format with SC-59 package designation. Higher power dissipation rating (338 mW) provides additional thermal margin. ROHS3 compliant with unlimited moisture sensitivity rating.

SMMUN2213LT1G (onsemi): Direct electrical equivalent with automotive-grade qualification (AEC-Q101) supplied in Cut Tape & Digi-Reel packaging. Required for automotive applications subject to AEC-Q101 standards. SOT-23-3 package format. ROHS3 compliant.

SMMUN2213LT3G (onsemi): Direct electrical equivalent with automotive-grade qualification (AEC-Q101) supplied in Tape & Reel format. Required for automotive applications subject to AEC-Q101 standards. SOT-23-3 package format. ROHS3 compliant.

All substitute parts are active products with established supply availability.

Frequently Asked Questions (FAQ)

Q: Can MMUN2213LT1G replace RN1404S,LF in any application?

A: Yes. MMUN2213LT1G maintains electrical equivalence across all critical parameters: 100 mA maximum collector current, 50 V breakdown voltage, 47 kOhm integrated resistors, and 80 minimum DC current gain. The primary difference is packaging format (Cut Tape & Digi-Reel vs. S-Mini) and slightly higher power rating (246 mW vs. 200 mW). Pinout and functional behavior are identical.

Q: What is the difference between SMMUN2213LT1G and MMUN2213LT1G?

A: Both parts are electrically identical with matching electrical specifications. SMMUN2213LT1G carries automotive-grade qualification (AEC-Q101) and is supplied in Cut Tape & Digi-Reel packaging. MMUN2213LT1G is a commercial-grade equivalent supplied in the same packaging format. Selection depends on whether automotive qualification is required for the application.

Q: Why does MUN2213T1G have a higher power rating (338 mW) than the original RN1404S,LF (200 mW)?

A: Higher power dissipation rating indicates greater thermal capability but does not affect electrical substitution. The device operates identically within the specified electrical parameters. The increased power rating provides additional design margin in applications with higher thermal stress.

Q: Are all substitute parts RoHS compliant?

A: Yes. The original RN1404S,LF is RoHS Compliant. All substitute parts are ROHS3 Compliant, which represents an updated RoHS standard. Both compliance levels are acceptable for RoHS-regulated applications.

Q: What packaging formats are available among the substitutes?

A: MMUN2213LT1G and SMMUN2213LT1G are supplied in Cut Tape & Digi-Reel format. MUN2213T1G and SMMUN2213LT3G are supplied in Tape & Reel format. All parts use compatible surface mount packages (TO-236-3, SC-59, SOT-23-3) with identical pinout and footprint compatibility.

Q: Is automotive qualification required for my application?

A: Automotive qualification (AEC-Q101) is required only if the device will be used in automotive applications subject to automotive industry standards. For commercial and industrial applications, non-automotive-grade substitutes (MMUN2213LT1G or MUN2213T1G) are appropriate.

Q: Do all substitutes have the same moisture sensitivity level?

A: Yes. The original RN1404S,LF and all substitute parts carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.