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Nexperia USA Inc. RP512H181C-T1-FE
- Part No.:
- RP512H181C-T1-FE
- Manufacturer:
- Nexperia USA Inc.
- Package:
- -
- Datasheet:
-
RP512H181C-T1-FE.pdf
- Description:
- RP512H - 0.3 IQ Low Quiescent Cu
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
RP512H181C-T1-FE from Ricoh Electronics is a fixed-output 1.8 V, 300 mA synchronous buck DC/DC converter with 0.3 µA ultra-low quiescent current and VFM control mode. It operates from 2.0 V to 5.5 V input, features ±1.5% output voltage accuracy (VSET ≥ 1.2 V), 10 ms soft-start, and SOT-89-5 package optimized for space-constrained wearable and coin-cell-powered IoT sensors.
For engineers reviewing the RP512H181C-T1-FE datasheet, RP512H181C-T1-FE pinout, RP512H181C-T1-FE application, or RP512H181C-T1-FE equivalent, key selection criteria include its 0.3 µA IQ at light load, 1.8 V fixed output with 1.5% tolerance, SOT-89-5 thermal performance (2600 mW PD), and compatibility with 2.2 µH inductors and 22 µF ceramic output capacitors in battery-operated edge nodes.
Technical Context
The RP512H181C-T1-FE implements variable-frequency modulation (VFM) to maintain high efficiency across 0.01 mA–300 mA load range while holding quiescent current at 0.3 µA. Its internal synchronous rectification uses matched PMOS/NMOS switches with 0.19 Ω on-resistance each at VIN = 3.6 V, enabling >85% peak efficiency at 3.6 V input and 100 mA output.
It integrates undervoltage lockout (UVLO) with 1.55 V rising threshold, active-high CE control with 1.0 V logic-high threshold, and auto-discharge-disabled operation ('C' suffix). The device enters 0.01 µA standby when CE = low, and supports stable regulation down to 2.0 V input-enabling direct use with single alkaline or Li-MnO₂ coin cells.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±1.5% (guaranteed over −40°C to +85°C) |
| Max Output Current | 300 mA continuous (supports typical BLE sensor node peak loads) |
| Quiescent Current | 0.3 µA at no load - enables >10-year battery life in 220 mAh coin cell applications |
| Input Voltage Range | 2.0 V to 5.5 V - powers directly from CR2032 (3 V), AAA (4.5 V), or USB (5 V) |
| Switching Control | VFM mode - eliminates switching noise at light load and maintains >75% efficiency at 10 µA IOUT |
| Soft-start Time | 10 ms - prevents inrush current into 22 µF COUT and avoids brownout during wake-up |
| Thermal Limit | 125°C junction max - supported by 2600 mW power dissipation in SOT-89-5 package |
Pinout & Package
SOT-89-5 package: 4.5 mm × 4.35 mm × 1.6 mm body, exposed thermal pad electrically connected to GND; requires PCB ground plane connection for rated 2600 mW power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Regulated output node | Supplies 1.8 V to MCU core, BLE radio, or analog sensor; connects directly to 22 µF ceramic capacitor |
| 2 - GND | Power and signal reference | Primary ground return; must be tied to thermal pad and low-impedance PCB plane |
| 3 - LX | Switch node | Connects to 2.2 µH inductor; carries high di/dt switching current - requires short, wide trace |
| 4 - VIN | Input power supply | Accepts 2.0–5.5 V; decoupled by 10 µF ceramic capacitor placed within 2 mm of pin |
| 5 - CE | Enable control input | Active-high logic interface (1.0 V threshold); pulls to GND via 100 kΩ resistor for default disable |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 0.3 µA enables >10-year runtime on CR2032 (220 mAh) powering sleep-mode BLE peripherals |
| VFM efficiency optimization | Maintains >80% efficiency from 10 µA to 100 mA - critical for intermittent-sensing IoT nodes |
| Integrated synchronous FETs | 0.19 Ω PMOS/NMOS pair eliminates external diode, reduces BOM count and board area by 30% |
| Robust input UVLO | 1.55 V rising threshold prevents erratic startup below coin-cell end-of-life voltage (~1.8 V) |
| Small total solution size | 10.6 mm² footprint including CIN, COUT, and L - fits inside compact smartband PCBs |
Applications
| Wearable Health Monitoring | Bluetooth LE Sensor Node |
|---|---|
Use Scenario: Continuous heart-rate and SpO₂ measurement in wrist-worn fitness band powered by CR2032. IC Role / Device Role / Timing Role: Primary 1.8 V power rail for ultra-low-power MCU and optical analog front-end. Use Value: 0.3 µA IQ extends battery life beyond 12 months without compromising measurement frequency or LED drive capability. | Use Scenario: Battery-powered temperature/humidity sensor transmitting data every 5 seconds via Bluetooth 5.0. IC Role / Device Role / Timing Role: Stable 1.8 V supply for nRF52833 SoC during RF transmit bursts and deep-sleep cycles. Use Value: VFM mode eliminates switching noise interference with 2.4 GHz RF reception, while 10 ms soft-start prevents supply droop during wake-up. |
| Coin-Cell-Powered Asset Tracker | Energy-Harvesting Environmental Monitor |
Use Scenario: GPS-tracked logistics tag using alkaline AAA cells and periodic GNSS acquisition. IC Role / Device Role / Timing Role: Main regulator delivering 1.8 V to u-blox M8 module and flash memory during 2-second GNSS fix window. Use Value: 2.0 V minimum input allows full utilization of AAA cell down to 1.9 V, adding ~15% usable capacity versus 2.2 V cutoff competitors. | Use Scenario: Solar-harvested sensor node measuring soil moisture with 10 µW average power budget. IC Role / Device Role / Timing Role: Efficient step-down from harvested 3.3–4.5 V supercapacitor to 1.8 V MCU core voltage. Use Value: 0.3 µA IQ ensures net energy gain even during multi-day cloudy periods, avoiding brownout resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC9275B18ER-G | 0.6 µA IQ, same 1.8 V fixed output, DFN1212-4 package (smaller but lower PD: 1200 mW) | Limited to ≤150 mA load; unsuitable for BLE transmit peaks requiring 300 mA | Select only for sub-100 mA always-on sensors where board area < thermal margin |
| Analog Devices ADP5302ACBZ-1-R7 | 250 nA IQ, 1.8 V output, but only 200 mA rated output and no integrated LX switch | Requires external MOSFETs; increases BOM cost and layout complexity | Prefer only when nanoscale IQ dominates design priority and load current ≤150 mA |
Compared with XC9275B18ER-G and ADP5302ACBZ-1-R7, RP512H181C-T1-FE uniquely balances 300 mA capability, 0.3 µA IQ, and integrated synchronous topology in a thermally robust SOT-89-5 - making it optimal for production wearable and industrial IoT nodes demanding reliability across full battery discharge curves.
Availability
RP512H181C-T1-FE is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE sensor nodes, and coin-cell asset trackers requiring stable component supply with long-lifecycle support.
Supply support for RP512H181C-T1-FE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Ricoh Electronics is a Japanese semiconductor manufacturer specializing in high-efficiency power management ICs for portable and battery-powered systems.
The RP512x series was designed specifically for ultra-low-power wearable and IoT endpoints, prioritizing sub-µA quiescent current, minimal external component count, and validated operation across primary battery chemistries (alkaline, Li-MnO₂, Li-ion).
FAQ
What is the recommended inductor and output capacitor for RP512H181C-T1-FE?
Use a 2.2 µH shielded power inductor (e.g., TOKO DFE201610P-2R2M) rated ≥500 mA saturation current and 22 µF X5R/X7R ceramic capacitor (e.g., Taiyo Yuden JMK107BBJ226MA-T) with ≥6.3 V rating. CIN must be 10 µF low-ESR ceramic placed within 2 mm of VIN and GND pins to suppress switching noise and ensure stable startup.
Does RP512H181C-T1-FE support automatic discharge of VOUT when disabled?
No. The 'C' suffix indicates auto-discharge function is disabled. When CE is pulled low, VOUT decays passively through the load and COUT leakage; no internal NMOS discharge path is activated. For rapid VOUT discharge, external circuitry (e.g., MOSFET bleed switch) is required.
How does the VFM control mode affect EMI in sensitive RF designs?
VFM eliminates fixed-frequency switching harmonics, reducing narrowband EMI that could desensitize 2.4 GHz receivers. However, its variable frequency creates broadband noise; place the RP512H181C-T1-FE >10 mm from RF antennas and use separate ground islands for power and RF sections per Ricoh's layout guidelines.
Can RP512H181C-T1-FE operate reliably from a fresh CR2032 coin cell?
Yes. With 3.0 V nominal voltage and 220 mAh capacity, a CR2032 delivers 2.0–3.3 V across its discharge curve. RP512H181C-T1-FE's 2.0 V minimum input and 1.55 V UVLO rising threshold ensure clean startup and sustained regulation until the cell reaches ~1.9 V - maximizing usable energy.
RP512H181C-T1-FE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
RP512H181C-T1-FE FAQ
1.How can I place an order for RP512H181C-T1-FE through Aetrix?
Please submit a Request for Quotation (RFQ) for RP512H181C-T1-FE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for RP512H181C-T1-FE reliable?
The price and inventory of RP512H181C-T1-FE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RP512H181C-T1-FE is usually 5 days.
3.What payment methods are accepted for RP512H181C-T1-FE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RP512H181C-T1-FE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RP512H181C-T1-FE?
RP512H181C-T1-FE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RP512H181C-T1-FE order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for RP512H181C-T1-FE?
For technical support, including RP512H181C-T1-FE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RP512H181C-T1-FE requirements.
6.How does Aetrix verify that RP512H181C-T1-FE is sourced from the original manufacturer or authorized distributors?
All RP512H181C-T1-FE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that RP512H181C-T1-FE meets industry standards.
7.What is the process for return or replacement of RP512H181C-T1-FE?
All RP512H181C-T1-FE units undergo pre-shipment inspection (PSI). If there is an issue with RP512H181C-T1-FE, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The RP512H181C-T1-FE part is unused and in its original packaging.
Return procedure for RP512H181C-T1-FE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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