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RN4902,LF(CT Pre-Biased Bipolar Transistor Equivalent & Substitute Parts
Part Overview
The RN4902,LF(CT is a pre-biased dual bipolar transistor (1 NPN, 1 PNP) manufactured by Toshiba Semiconductor and Storage in a 6-TSSOP surface mount package. This component operates at 50V maximum collector-emitter breakdown voltage with 100mA maximum collector current and 200mW power dissipation. The device is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).
Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for components with enhanced electrical characteristics within the same functional category.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Transistor Type | 1 NPN, 1 PNP - Pre-Biased (Dual) | — |
| Current - Collector (Ic) Max | 100 | mA |
| Voltage - Collector Emitter Breakdown (Max) | 50 | V |
| Resistor - Base (R1) | 10 | kOhms |
| Resistor - Emitter Base (R2) | 10 | kOhms |
| Power - Max | 200 | mW |
| Package / Case | 6-TSSOP, SC-88, SOT-363 | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the RN4902,LF(CT is determined by the following critical parameters:
Mandatory Matching Parameters:
- Transistor Type: 1 NPN, 1 PNP - Pre-Biased (Dual)
- Current - Collector (Ic) Max: 100mA
- Voltage - Collector Emitter Breakdown (Max): 50V
- Resistor - Base (R1): 10kOhms
- Resistor - Emitter Base (R2): 10kOhms
- Package / Case: 6-TSSOP, SC-88, SOT-363
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
Allowable Variation Parameters:
- Power - Max: Equal to or greater than 200mW
- DC Current Gain (hFE): May vary based on measurement conditions
- Vce Saturation: May vary within acceptable operating ranges
- Current - Collector Cutoff: May vary
- Frequency - Transition: May vary or be unspecified
- Packaging Format: Cut Tape (CT), Digi-Reel, or Tape & Reel (TR) acceptable
Substitute parts are grouped into two categories: Upgrade parts (enhanced electrical characteristics) and Similar parts (equivalent electrical characteristics with alternative manufacturers or automotive qualifications).
Parameter Comparison
| Parameter | RN4902,LF(CT | PUMD3,115 | PUMD3,135 | PUMD3,165 | DCX114EU-13R-F | DCX114EU-7-F | MUN5311DW1T1G |
|---|---|---|---|---|---|---|---|
| Manufacturer | Toshiba | Nexperia | Nexperia | Nexperia | Diodes Inc. | Diodes Inc. | onsemi |
| Transistor Type | 1 NPN, 1 PNP | 1 NPN, 1 PNP | 1 NPN, 1 PNP | 1 NPN, 1 PNP | 1 NPN, 1 PNP | 1 NPN, 1 PNP | 1 NPN, 1 PNP |
| Ic (Max) | 100mA | 100mA | 100mA | 100mA | 100mA | 100mA | 100mA |
| Vce Breakdown (Max) | 50V | 50V | 50V | 50V | 50V | 50V | 50V |
| R1 (Base) | 10kOhms | 10kOhms | 10kOhms | 10kOhms | 10kOhms | 10kOhms | 10kOhms |
| R2 (Emitter Base) | 10kOhms | 10kOhms | 10kOhms | 10kOhms | 10kOhms | 10kOhms | 10kOhms |
| Power - Max | 200mW | 300mW | 300mW | 300mW | 200mW | 200mW | 250mW |
| Package / Case | 6-TSSOP, SC-88, SOT-363 | 6-TSSOP, SC-88, SOT-363 | 6-TSSOP, SC-88, SOT-363 | 6-TSSOP, SC-88, SOT-363 | 6-TSSOP, SC-88, SOT-363 | 6-TSSOP, SC-88, SOT-363 | 6-TSSOP, SC-88, SOT-363 |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Upgrade Substitutes (Enhanced Power Dissipation)
PUMD3,115 (Nexperia USA Inc.) and PUMD3,135 (Nexperia USA Inc.) and PUMD3,165 (Nexperia USA Inc.) are classified as upgrade substitutes. These parts maintain all mandatory electrical parameters identical to the RN4902,LF(CT while providing increased maximum power dissipation of 300mW compared to the original 200mW specification. All three Nexperia PUMD3 variants are Active status products with ROHS3 compliance and REACH Unaffected status. PUMD3,115 is available in Cut Tape & Digi-Reel packaging, while PUMD3,135 and PUMD3,165 are supplied in Tape & Reel format. These parts are suitable for applications requiring higher thermal headroom within the same functional envelope.
Similar Substitutes (Equivalent Electrical Characteristics)
DCX114EU-13R-F, DCX114EU-7-F, DCX114EUQ-13-F, DCX114EUQ-13R-F, and DCX114EUQ-7-F (Diodes Incorporated) are classified as similar substitutes. These parts maintain all mandatory electrical parameters and are supplied in Tape & Reel packaging. DCX114EUQ variants include automotive grade qualification (AEC-Q101) and are suitable for automotive applications. All DCX114 variants are Active status products with ROHS3 compliance and REACH Unaffected status.
MUN5311DW1T1G (onsemi) is classified as a similar substitute with Active product status, ROHS3 compliance, and REACH Unaffected status. This part is supplied in Cut Tape & Digi-Reel packaging and provides 250mW maximum power dissipation.
DDC114EU-7-F (Diodes Incorporated) is a similar substitute with a different transistor configuration (2 NPN - Pre-Biased instead of 1 NPN, 1 PNP). This part is not recommended as a direct substitute due to the different transistor type configuration.
All substitute parts maintain identical mandatory parameters: 100mA maximum collector current, 50V maximum collector-emitter breakdown voltage, 10kOhms base and emitter-base resistors, and 6-TSSOP/SC-88/SOT-363 surface mount packaging with ROHS3 compliance.
Frequently Asked Questions (FAQ)
Q: Can PUMD3,115, PUMD3,135, or PUMD3,165 be used as direct replacements for RN4902,LF(CT?
A: Yes. All three Nexperia PUMD3 variants maintain identical mandatory electrical parameters (transistor type, collector current, breakdown voltage, base resistors, and package type). The increased power dissipation rating (300mW vs. 200mW) represents an enhancement that does not affect compatibility. Packaging format differences (Cut Tape & Digi-Reel for PUMD3,115; Tape & Reel for PUMD3,135 and PUMD3,165) may require manufacturing process adjustments but do not affect electrical performance.
Q: What is the difference between DCX114EU-13R-F and DCX114EU-7-F?
A: Both parts are manufactured by Diodes Incorporated and maintain identical electrical specifications. The suffix designations (-13R-F vs. -7-F) indicate different internal resistor configurations or tape packaging specifications. Both are suitable substitutes for the RN4902,LF(CT with equivalent electrical characteristics.
Q: Are automotive-qualified variants (DCX114EUQ series) compatible with non-automotive applications?
A: Yes. Automotive-qualified parts (DCX114EUQ-13-F, DCX114EUQ-13R-F, DCX114EUQ-7-F) with AEC-Q101 qualification maintain all electrical parameters required for the RN4902,LF(CT and are suitable for any application within the specified electrical operating range. Automotive qualification represents an additional quality assurance level and does not restrict use in non-automotive designs.
Q: Why is DDC114EU-7-F listed but not recommended?
A: DDC114EU-7-F contains 2 NPN transistors in a pre-biased configuration, whereas the RN4902,LF(CT contains 1 NPN and 1 PNP transistor. The different transistor type configuration makes this part unsuitable as a direct substitute despite matching other parameters such as package type and electrical ratings.
Q: What packaging formats are available for substitute parts?
A: Substitute parts are available in three packaging formats: Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), and standard tape configurations. The RN4902,LF(CT is supplied in Tape & Reel format. PUMD3,115 and MUN5311DW1T1G are available in Cut Tape & Digi-Reel format. PUMD3,135, PUMD3,165, and all DCX114 variants are available in Tape & Reel format. Manufacturing process requirements determine which packaging format is appropriate for a specific application.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance identical to the RN4902,LF(CT. Additionally, Nexperia and Diodes Incorporated parts carry REACH Unaffected status, providing additional environmental compliance documentation.
Q: What is the significance of the MSL 1 (Unlimited) moisture sensitivity rating?
A: MSL 1 (Unlimited) indicates that the component has no moisture sensitivity restrictions and does not require special handling, storage, or baking procedures prior to soldering. All substitute parts maintain this same MSL 1 rating, ensuring compatibility with standard manufacturing processes.
Q: Can MUN5311DW1T1G be used in place of RN4902,LF(CT despite different power ratings?
A: Yes. MUN5311DW1T1G provides 250mW maximum power dissipation compared to the RN4902,LF(CT specification of 200mW. This represents an enhancement that maintains full compatibility. The part maintains all other mandatory electrical parameters and is suitable for direct substitution.
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