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RP173N121A-TR-FE Equivalent & Substitute Parts
Part Overview
The RP173N121A-TR-FE is a linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc., classified as a Power Management (PMIC) component. This device delivers a fixed positive 1.2V output at 150mA in a surface-mount SOT-23-5 package. The part is actively produced and RoHS compliant, designed for applications requiring stable low-voltage regulation with integrated protection features.
Substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or equivalent performance specifications across the RP173x series.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Nisshinbo Micro Devices Inc. |
| Category | Power Management (PMIC) |
| Output Voltage (Fixed) | 1.2V |
| Output Current | 150mA |
| Input Voltage (Max) | 11V |
| Dropout Voltage (Max) | 2.59V @ 150mA |
| Quiescent Current | 3.7 µA |
| PSRR | 30dB (1kHz) |
| Package Type | SOT-23-5 (SC-74A, SOT-753) |
| Operating Temperature Range | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS Compliant |
| Moisture Sensitivity Level | MSL 1 (Unlimited) |
Substitute Part Grouping Explanation
The RP173N121A-TR-FE belongs to the RP173x series of linear voltage regulators. Substitute parts within this series are qualified based on identical electrical and mechanical parameters:
Substitution Criteria:
- Fixed output voltage: 1.2V
- Output current capacity: 150mA
- Maximum input voltage: 11V
- Dropout voltage: 2.59V @ 150mA
- Quiescent current: 3.7 µA
- PSRR: 30dB (1kHz)
- Package configuration: SOT-23-5
- Operating temperature range: -40°C ~ 85°C
- Control features: Enable function
- Protection features: Over Current, Reverse Current
- Compliance: RoHS Compliant, MSL 1
Parts meeting all these parameters are direct parametric equivalents and may be substituted without circuit modification.
Parameter Comparison
| Parameter | RP173N121A-TR-FE | RP173N121B-TR-FE | RP173N121D-TR-FE |
|---|---|---|---|
| Manufacturer | Nisshinbo Micro Devices Inc. | Nisshinbo Micro Devices Inc. | Nisshinbo Micro Devices Inc. |
| Output Voltage | 1.2V | 1.2V | 1.2V |
| Output Current | 150mA | 150mA | 150mA |
| Input Voltage (Max) | 11V | 11V | 11V |
| Dropout Voltage (Max) | 2.59V @ 150mA | 2.59V @ 150mA | 2.59V @ 150mA |
| Quiescent Current | 3.7 µA | 3.7 µA | 3.7 µA |
| PSRR | 30dB (1kHz) | 30dB (1kHz) | 30dB (1kHz) |
| Package | SOT-23-5 | SOT-23-5 | SOT-23-5 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Control Features | Enable | Enable | Enable |
| Protection Features | Over Current, Reverse Current | Over Current, Reverse Current | Over Current, Reverse Current |
| RoHS Status | RoHS Compliant | RoHS Compliant | RoHS Compliant |
| MSL Rating | MSL 1 (Unlimited) | MSL 1 (Unlimited) | MSL 1 (Unlimited) |
Engineering Selection Recommendations
All three parts—RP173N121A-TR-FE, RP173N121B-TR-FE, and RP173N121D-TR-FE—are active products from Nisshinbo Micro Devices Inc. with identical electrical specifications and mechanical packaging. Each part is RoHS compliant and carries MSL 1 rating, indicating no moisture sensitivity restrictions during storage and handling.
Selection between these parts is determined by availability and supply chain requirements rather than technical performance differences. All three parts satisfy identical design requirements for 1.2V, 150mA linear regulation applications in SOT-23-5 surface-mount configurations.
Current inventory levels are as follows: RP173N121A-TR-FE (993 pcs), RP173N121B-TR-FE (820 pcs), and RP173N121D-TR-FE (815 pcs).
Frequently Asked Questions (FAQ)
Q: Can RP173N121B-TR-FE and RP173N121D-TR-FE be used interchangeably with RP173N121A-TR-FE?
A: Yes. All three parts share identical electrical parameters, output voltage, current capacity, dropout voltage, quiescent current, PSRR, operating temperature range, and package configuration. They are direct parametric equivalents.
Q: Are there any differences in the SOT-23-5 package between these parts?
A: No. All three parts use the same SOT-23-5 package designation (SC-74A, SOT-753). Pin configuration and mechanical dimensions are identical.
Q: Do these parts require different PCB layouts or circuit modifications?
A: No. The parts are pin-compatible and electrically equivalent. Existing PCB designs and circuits require no modification when substituting between these three part numbers.
Q: What is the significance of the different suffix letters (A, B, D) in the part numbers?
A: The suffix letters indicate different manufacturing batches or revisions within the RP173x series. All suffixes maintain identical electrical and mechanical specifications for the 1.2V, 150mA configuration.
Q: Are all three parts RoHS compliant?
A: Yes. RP173N121A-TR-FE, RP173N121B-TR-FE, and RP173N121D-TR-FE are all RoHS compliant with MSL 1 moisture sensitivity rating.
Q: What is the maximum input voltage these regulators accept?
A: The maximum input voltage for all three parts is 11V. Exceeding this voltage may damage the device.
Q: What protection features are integrated into these regulators?
A: All three parts include Over Current and Reverse Current protection features.
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