RN1306,LF Equivalent & Substitute Parts

Part Overview

The RN1306,LF is a 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 classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Pre-biased BJT transistors integrate internal base resistor networks to simplify circuit design and reduce component count in switching and amplification applications. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and regulatory compliance to ensure direct functional replacement in existing designs.

Substiute Parts

RN1306,LF

Toshiba Semiconductor and StorageIn Stock: 174462RN1306,LF Datasheet

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MUN5233T1G

onsemiIn Stock: 2429MUN5233T1G Datasheet

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PDTC143ZU,115

Nexperia USA Inc.In Stock: 113030PDTC143ZU,115 Datasheet

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SMUN5233T1G

onsemiIn Stock: 5978SMUN5233T1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RN1306,LF are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Transistor Type: NPN - Pre-Biased
• Maximum Collector Current (Ic): 100 mA
• Maximum Collector-Emitter Breakdown Voltage (Vce(br)ceo): 50 V
• Base Resistor (R1): 4.7 kOhms
• Emitter-Base Resistor (R2): 47 kOhms
• Package Type: SC-70 or SOT-323 (mechanically and electrically equivalent)
• Mounting Type: Surface Mount
• Regulatory Compliance: RoHS3 Compliant

All identified substitute parts maintain these core electrical specifications and package compatibility, enabling direct functional replacement in circuit applications. Variations in secondary parameters such as DC current gain (hFE) test conditions, saturation voltage (Vce(sat)), and maximum power dissipation are within acceptable engineering tolerances for pre-biased BJT applications.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts—MUN5233T1G, PDTC143ZU,115, and SMUN5233T1G—meet the core electrical and mechanical requirements for direct replacement of the RN1306,LF in surface mount applications.

Compliance and Regulatory Status: All substitute parts maintain RoHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage processes. REACH status information is available for Nexperia and onsemi devices, confirming regulatory alignment.

Product Status: All substitute parts are classified as Active products, ensuring continued availability and manufacturer support.

Packaging Compatibility: All substitute parts are housed in SC-70 or SOT-323 packages with surface mount configuration, providing mechanical and electrical interchangeability on printed circuit boards designed for the RN1306,LF.

Electrical Performance: Substitute parts demonstrate equivalent or superior electrical characteristics within the specified parameter ranges. Variations in saturation voltage and maximum power dissipation reflect different manufacturing processes and do not affect functional compatibility in pre-biased BJT switching applications.

Frequently Asked Questions (FAQ)

Q: Can MUN5233T1G, PDTC143ZU,115, and SMUN5233T1G be used interchangeably with RN1306,LF?

A: Yes. All substitute parts share identical critical electrical parameters: 100 mA maximum collector current, 50 V collector-emitter breakdown voltage, 4.7 kOhms base resistor, and 47 kOhms emitter-base resistor. All are housed in mechanically equivalent SC-70/SOT-323 packages for surface mount applications.

Q: Are there differences in DC current gain (hFE) between the main part and substitutes?

A: DC current gain specifications vary slightly in test conditions. The RN1306,LF specifies hFE minimum of 80 @ 10mA, 5V. MUN5233T1G and SMUN5233T1G specify 80 @ 5mA, 10V. PDTC143ZU,115 specifies 100 @ 10mA, 5V. These variations are within acceptable tolerances for pre-biased BJT applications and do not affect functional compatibility.

Q: What is the difference between SC-70 and SOT-323 package designations?

A: SC-70 and SOT-323 refer to the same physical package form factor. Both designations describe a three-lead surface mount package with identical pin configuration and footprint. Parts specified as either SC-70 or SOT-323 are mechanically and electrically interchangeable on the same printed circuit board.

Q: Do all substitute parts have the same saturation voltage (Vce(sat))?

A: No. Saturation voltage varies among substitutes: RN1306,LF specifies 300mV @ 250µA, 5mA; MUN5233T1G specifies 250mV @ 1mA, 10mA; PDTC143ZU,115 specifies 100mV @ 250µA, 5mA; SMUN5233T1G specifies 250mV @ 1mA, 10mA. These differences reflect different measurement conditions and manufacturing processes. All values remain within acceptable ranges for switching applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts—MUN5233T1G, PDTC143ZU,115, and SMUN5233T1G—are RoHS3 compliant and carry MSL 1 (unlimited) moisture sensitivity rating, matching the compliance profile of the RN1306,LF.

Q: What is the maximum power dissipation difference between parts?

A: The RN1306,LF is rated at 100 mW maximum power dissipation. MUN5233T1G and SMUN5233T1G are rated at 202 mW. PDTC143ZU,115 is rated at 200 mW. Higher power ratings in substitute parts provide additional thermal margin and do not affect compatibility in applications designed for the RN1306,LF.

Q: Can I use PDTC143ZU,115 if my circuit requires lower collector cutoff current?

A: PDTC143ZU,115 specifies maximum collector cutoff current of 1 µA, compared to 500 nA for the RN1306,LF. This difference may be significant in applications requiring extremely low leakage current. Verify circuit requirements before substitution.

Q: Are there packaging format differences between the main part and substitutes?

A: The RN1306,LF is supplied in Tape & Reel (TR) format. PDTC143ZU,115 is supplied in Cut Tape (CT) & Digi-Reel® format. MUN5233T1G and SMUN5233T1G are supplied in Tape & Reel (TR) format. These packaging differences affect procurement and handling but do not affect component electrical or mechanical performance.