RN1903FE,LF(CT Equivalent & Substitute Parts

Part Overview

The RN1903FE,LF(CT is a pre-biased dual NPN bipolar junction transistor manufactured by Toshiba Semiconductor and Storage. This surface mount component integrates two NPN transistors with internal base and emitter resistors in a compact SOT-563/SOT-666 package. The device is designed for applications requiring integrated biasing networks, reducing external component count and PCB area.

The RN1903FE,LF(CT maintains Active product status. Identifying equivalent and substitute parts is necessary when addressing supply chain constraints, inventory availability, or when design requirements permit alternative manufacturers while maintaining electrical and mechanical compatibility.

Substiute Parts

RN1903FE,LF(CT

Toshiba Semiconductor and StorageIn Stock: 4057RN1903FE,LF(CT Datasheet

Current PartRFQ

PEMH1,115

Nexperia USA Inc.In Stock: 5221PEMH1,115 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RN1903FE,LF(CT is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Transistor configuration: 2 NPN - Pre-Biased (Dual)
• Maximum collector current: 100 mA
• Maximum collector-emitter breakdown voltage: 50 V
• Base resistor value (R1): 22 kOhms
• Emitter-base resistor value (R2): 22 kOhms
• Package options: SOT-563 or SOT-666
• Mounting type: Surface Mount
• RoHS compliance: ROHS3 Compliant

Acceptable Variation Parameters:

• DC current gain (hFE): Minimum values may differ within application tolerance
• Vce saturation: Variations acceptable if within circuit operating margins
• Collector cutoff current: Variations acceptable if leakage remains within specification
• Transition frequency: Variations acceptable if application bandwidth requirements are met
• Maximum power dissipation: Higher ratings provide design margin

The PEMH1,115 from Nexperia USA Inc. meets all mandatory matching criteria and qualifies as a direct substitute for the RN1903FE,LF(CT.

Parameter Comparison

Engineering Selection Recommendations

RN1903FE,LF(CT (Toshiba Semiconductor and Storage)

Select this part when:

• Active product status is required for new designs
• Toshiba supply chain and support infrastructure is preferred
• Transition frequency specification of 250 MHz is a design requirement
• Maximum power dissipation of 100 mW meets application thermal constraints

PEMH1,115 (Nexperia USA Inc.)

This part is designated "Not For New Designs" and carries REACH Unaffected status. Selection of PEMH1,115 is limited to:

• Existing design maintenance and legacy system support
• Applications where higher maximum power dissipation (300 mW) provides additional thermal margin
• Lower Vce saturation (150 mV) benefits applications requiring reduced saturation losses
• Situations where Nexperia supply chain availability is advantageous

Both parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard surface mount assembly and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can PEMH1,115 be used as a direct replacement for RN1903FE,LF(CT in new designs?

A: No. PEMH1,115 carries "Not For New Designs" product status. New designs must use RN1903FE,LF(CT or equivalent parts with Active status. PEMH1,115 is restricted to legacy system support and existing design maintenance.

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

A: Substitution requires exact matching of: dual NPN pre-biased configuration, 100 mA maximum collector current, 50 V collector-emitter breakdown voltage, 22 kOhm base resistor, 22 kOhm emitter-base resistor, SOT-563 or SOT-666 package, and surface mount mounting type. All other parameters may vary within application tolerance.

Q: Are there package compatibility considerations between SOT-563 and SOT-666?

A: Both RN1903FE,LF(CT and PEMH1,115 support SOT-563 and SOT-666 packages. Verify the specific package variant required for your application and confirm PCB footprint compatibility before component selection.

Q: How do the DC current gain specifications differ between these parts?

A: RN1903FE,LF(CT specifies minimum hFE of 70 at 10 mA collector current and 5 V Vce. PEMH1,115 specifies minimum hFE of 60 at 5 mA collector current and 5 V Vce. Both values are acceptable for pre-biased transistor applications; verify circuit biasing calculations accommodate the lower gain specification if substituting.

Q: What is the significance of the transition frequency difference?

A: RN1903FE,LF(CT specifies 250 MHz transition frequency. PEMH1,115 does not provide this specification. If transition frequency is a design requirement, RN1903FE,LF(CT is the appropriate selection. For applications not requiring specified frequency response, this difference is not a limiting factor.

Q: Are there thermal considerations when selecting between these parts?

A: RN1903FE,LF(CT is rated for 100 mW maximum power dissipation. PEMH1,115 is rated for 300 mW maximum power dissipation. Applications operating near thermal limits benefit from the higher power rating of PEMH1,115. Verify actual power dissipation in your circuit to determine if the 100 mW rating of RN1903FE,LF(CT is sufficient.

Q: Do both parts meet the same compliance standards?

A: Yes. Both RN1903FE,LF(CT and PEMH1,115 are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. Both are classified as EAR99 for export control purposes. Compliance with standard surface mount assembly and storage procedures applies to both parts.