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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Infineon Technologies RP111H191D-T1-FE

Name: RP111H191D-T1-FE
Brand: Infineon Technologies
SKU: RP111H191D-T1-FE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RP111H191D-T1-FE

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: SOT-89-5/6

Datasheet:: RP111H191D-T1-FE.pdf

Description:: RP111H - Low Voltage Good Load T

Quantity:: RFQ Add To RFQ list

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Inventory:42,000

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Product details

Overview

RP111H191D-T1-FE from Nisshinbo Micro Devices Inc. is a 1.9V fixed-output, low-noise LDO voltage regulator in DFN1212-6 package with 150mA output current, 60dB PSRR at 1kHz, and 45μA quiescent current-designed for powering noise-sensitive analog circuits in portable instrumentation.

For engineers reviewing the RP111H191D-T1-FE datasheet, RP111H191D-T1-FE pinout, RP111H191D-T1-FE application, or RP111H191D-T1-FE equivalent, key selection criteria include dropout voltage at 150mA, load transient response under 10–90% step, thermal shutdown behavior, and MSL Level 1 reflow compatibility.

Technical Context

This LDO employs a CMOS-based error amplifier and P-channel MOSFET pass device, enabling ultra-low quiescent current and stable operation with 1μF ceramic output capacitance. It integrates thermal shutdown and overcurrent protection with foldback current limiting.

The regulator maintains ±2% output voltage accuracy over -40°C to +85°C ambient, supports input voltages from 2.0V to 5.5V, and achieves 70μV_RMS output noise (10Hz–100kHz) without external bypass capacitor.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.9V ±2% - ensures precise biasing for ADC references and RF front-end LNA stages.
Max Output Current	150mA - sufficient to power single-core microcontrollers or sensor signal chains without derating.
Quiescent Current	45μA - enables multi-year battery life in always-on IoT endpoint sensors.
PSRR @ 1kHz	60dB - suppresses switching noise from adjacent DC/DC converters feeding mixed-signal SoCs.
Dropout Voltage	180mV @ 150mA - allows operation from single Li-ion cell down to 2.0V input.
Output Noise	70μV_RMS (10Hz–100kHz) - avoids degradation of 16-bit SAR ADC SNR in precision data acquisition.

Pinout & Package

DFN1212-6 package: 1.2mm × 1.2mm × 0.4mm body, 0.4mm pitch, wettable flank terminals, MSL Level 1 per J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Input supply connection	Accepts 2.0–5.5V; requires local 1μF ceramic decoupling within 2mm.
VOUT	Regulated output node	Delivers 1.9V ±2%; must connect ≥1μF X5R/X7R ceramic capacitor directly to GND.
GND	Analog and power ground reference	Shared return path for error amplifier and pass device; connects to PCB thermal pad.
EN	Active-high enable control	Pulled high internally; driven low to reduce IQ to <1μA for system sleep mode.
NC	No-connect terminal	Internally unconnected; must remain floating or grounded per layout guidelines.
NC	No-connect terminal	Internally unconnected; must remain floating or grounded per layout guidelines.

Key Features

Feature	Design Value
Ultra-low quiescent current	45μA enables >10-year operation on CR2032 coin cell in wireless sensor nodes.
High PSRR at audio frequencies	60dB at 1kHz ensures clean power for MEMS microphone bias and op-amp signal conditioning.
Stable with small ceramic capacitors	Supports 1μF X5R/X7R output cap-reduces BOM count and PCB area vs. tantalum alternatives.
Thermal shutdown with hysteresis	Triggers at 150°C junction, releases at 135°C-prevents latch-up during sustained overload.

Applications

Portable Medical Sensors

Wearable Biopotential Monitors

Use Scenario: Continuous ECG/EMG signal acquisition in patch-style monitors powered by thin-film batteries.

IC Role / Device Role / Timing Role: Supplies ultra-clean 1.9V bias to instrumentation amplifiers and 16-bit ADCs.

Use Value: 70μV_RMS noise prevents baseline drift and preserves SNR >85dB in sub-μV bio-potential signals.

Use Scenario: Real-time heart rate variability analysis using photoplethysmography (PPG) with analog front-end.

IC Role / Device Role / Timing Role: Powers transimpedance amplifier and LED driver bias rails with minimal ripple coupling.

Use Value: 60dB PSRR isolates analog signal chain from digital MCU switching noise on shared PCB.

Low-Power Industrial Transmitters

Smart Meter Sensor Subsystems

Use Scenario: Battery-operated LoRaWAN temperature/humidity nodes deployed in remote utility infrastructure.

IC Role / Device Role / Timing Role: Regulates power to SiP radios and precision temperature sensors during periodic wake-up bursts.

Use Value: 45μA IQ extends 2xAA alkaline battery life beyond 5 years at 10-minute reporting intervals.

Use Scenario: Metrology-grade current sensing using shunt resistors and delta-sigma ADCs in residential smart meters.

IC Role / Device Role / Timing Role: Provides stable 1.9V reference voltage for ADC internal bandgap and analog mux.

Use Value: ±2% output accuracy over temperature maintains <0.1% energy measurement error across -25°C to +70°C operating range.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP2112K-1.9TRG1	Higher IQ (65μA), lower PSRR (50dB @ 1kHz), SOT-23-5 package	Larger footprint; less suitable for space-constrained wearables	Prefer when cost sensitivity outweighs noise performance and board area.
MCP1700T-1902E/TT	Same IQ (45μA), but only 45dB PSRR @ 1kHz and no thermal shutdown	Requires external thermal monitoring in high-ambient deployments	Choose only for non-safety-critical consumer devices with strict cost targets.

Compared with AP2112K-1.9TRG1 and MCP1700T-1902E/TT, RP111H191D-T1-FE delivers superior noise suppression and integrated protection in the smallest footprint-critical for medical-grade wearable signal integrity and long-term field reliability.

Availability

RP111H191D-T1-FE is available at Aetrix Electronics and suitable for portable medical sensors, wearable biopotential monitors, and low-power industrial transmitters requiring stable component supply with full traceability and lifecycle support.

Supply support for RP111H191D-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

Nisshinbo Micro Devices Inc. is a Japanese semiconductor company specializing in high-precision analog ICs, particularly low-noise LDOs, battery management, and sensor interface solutions for industrial and medical markets.

The RP111L series was designed to address stringent noise, accuracy, and reliability requirements in battery-powered precision analog systems-especially where PSRR, IQ, and thermal robustness are critical.

FAQ

What is the minimum input voltage required for stable 1.9V output at 150mA load?

The RP111H191D-T1-FE requires a minimum input voltage of 2.08V to maintain regulation at 150mA due to its 180mV dropout specification. Below this, output voltage drops linearly with input; operation below 2.0V is not guaranteed and may cause brownout in downstream circuitry.

Does this LDO require an external bypass capacitor for optimal noise performance?

No external bypass capacitor is required-the RP111H191D-T1-FE achieves 70μV_RMS noise with only the recommended 1μF ceramic output capacitor. Adding a 10nF capacitor in parallel does not improve noise and may risk instability if layout parasitics exceed design limits.

How does the EN pin behave during power-up and system reset sequences?

The EN pin has an internal pull-up resistor (~10MΩ) and is active-high. It remains functional down to VIN = 1.8V, allowing controlled startup after battery insertion or cold reset. No external pull-up is needed unless level-shifting from a 1.2V logic domain is required.

Is the DFN1212-6 package compatible with standard reflow profiles for lead-free assembly?

Yes-the DFN1212-6 package is qualified for IR reflow per J-STD-020 MSL Level 1 and withstands three 260°C peak temperature cycles. Its wettable flanks support automated optical inspection (AOI) of solder joint quality without X-ray.

RP111H191D-T1-FE Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: RP111x

Package/Case:: SOT-89-5/6

Packaging:: Bulk

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.25V

Voltage - Output (Min/Fixed):: 1.9V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.41V @ 500mA

Current - Output:: 500mA

Current - Quiescent (Iq):: 125 µA

Current - Supply (Max):: -

PSRR:: 75dB (10kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89-5

RP111H191D-T1-FE FAQ

1.How can I place an order for RP111H191D-T1-FE through Aetrix?

Please submit a Request for Quotation (RFQ) for RP111H191D-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 RP111H191D-T1-FE reliable?

The price and inventory of RP111H191D-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 RP111H191D-T1-FE is usually 5 days.

3.What payment methods are accepted for RP111H191D-T1-FE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RP111H191D-T1-FE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RP111H191D-T1-FE?

RP111H191D-T1-FE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RP111H191D-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 RP111H191D-T1-FE?

For technical support, including RP111H191D-T1-FE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RP111H191D-T1-FE requirements.

6.How does Aetrix verify that RP111H191D-T1-FE is sourced from the original manufacturer or authorized distributors?

All RP111H191D-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 RP111H191D-T1-FE meets industry standards.

7.What is the process for return or replacement of RP111H191D-T1-FE?

All RP111H191D-T1-FE units undergo pre-shipment inspection (PSI). If there is an issue with RP111H191D-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 RP111H191D-T1-FE part is unused and in its original packaging.

Return procedure for RP111H191D-T1-FE:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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