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

Nexperia USA Inc. RP111H281D-T1-FE

Name: RP111H281D-T1-FE
Brand: Nexperia USA Inc.
SKU: RP111H281D-T1-FE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RP111H281D-T1-FE

Manufacturer:: Nexperia USA Inc.

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

Package:: SOT-89-5/6

Datasheet:: RP111H281D-T1-FE.pdf

Description:: RP111H - Low Voltage Good Load T

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Product details

Overview

RP111H281D-T1-FE from Ricoh Electronics is a CMOS-based low-dropout linear regulator with 500mA output current, fixed 2.8V output, and auto-discharge function. It operates from 1.4V to 5.25V input, achieves ±0.8% output voltage accuracy (≥1.8V), and delivers 75dB ripple rejection at 1kHz. Its 0.23V dropout (at 500mA, VOUT=2.5V) and −75/+45mV load transient response support stable power delivery in compact battery-powered systems.

For engineers reviewing the RP111H281D-T1-FE datasheet, RP111H281D-T1-FE pinout, RP111H281D-T1-FE application, or RP111H281D-T1-FE equivalent, key selection criteria include its SOT-89-5 package thermal performance (900mW on standard land pattern), 0.1µA standby current, and verified load transient behavior under 1mA↔250mA step changes with 1µF/2.2µF output capacitors.

Technical Context

The RP111H281D-T1-FE integrates a precision bandgap reference, error amplifier, and N-channel pass transistor with 60Ω typical ON-resistance (for D-version). Its feedback loop uses internal VFB = 0.7V and supports both fixed-output and adjustable configurations via external resistor dividers.

It includes three protection circuits: foldback current limiting (50mA short-circuit current), thermal shutdown (165°C trip, 100°C release), and inrush current limit (400mA for 180µs at startup). The auto-discharge function actively pulls VOUT to GND when CE = L, enabling rapid system power-down.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8V ±0.8% (guaranteed over −40°C to +85°C)
Max Output Current	500mA continuous; enables single-rail supply for microcontrollers and sensors
Dropout Voltage	0.23V typ. at 500mA (VOUT=2.5V); allows operation with VIN as low as 3.03V
Ripple Rejection	75dB at 1kHz; suppresses switching noise from upstream DC/DC converters
Supply Current	80µA typ.; minimizes quiescent loss in always-on subsystems
Standby Current	0.1µA typ.; supports ultra-low-power sleep modes
Line Regulation	0.02%/V; maintains stable output across wide input voltage swings
Thermal Shutdown	165°C junction temperature; protects against sustained overload or poor PCB heatsinking

Pinout & Package

SOT-89-5 package with exposed tab connected to GND; optimized for thermal dissipation up to 900mW on standard PCB land pattern.

Pin/Terminal	Circuit Role	Design Meaning
1	VFB	Feedback input referenced to 0.7V internal reference; connects directly to VOUT for fixed output
2	GND	Power ground return; tab must be connected to GND plane for thermal and electrical integrity
3	CE	Chip enable (active-high); controls auto-discharge: pulls VOUT to GND when CE = L
4	VDD	Input voltage supply (1.4V–5.25V); requires ≥1.0µF ceramic bypass capacitor
5	VOUT	Regulated 2.8V output; supports 1.0µF minimum ceramic output capacitor for stability

Key Features

Feature	Design Value
Auto-discharge function	Actively discharges output capacitance when disabled, reducing residual voltage and enabling fast system reset
Excellent load transient response	−75/+45mV undershoot/overshoot (1mA ↔ 250mA, tr=tf=0.5µs, COUT=1µF) ensures stable MCU core voltage during burst activity
Low-noise operation	20 × VOUT µVrms (BW=10Hz–100kHz); suitable for analog sensor and RF front-end power domains
Stable with ceramic capacitors	Designed for ≥1.0µF X5R/X7R ceramics; eliminates need for higher-ESR tantalum or electrolytic caps
High accuracy over temperature	±30ppm/°C output drift (≥1.8V); maintains tight regulation across industrial ambient range

Applications

Portable Communication Devices

Digital Cameras & Camcorders

Use Scenario: Powering baseband processors and RF transceivers in handheld radios and IoT modems.

IC Role / Device Role / Timing Role: Primary 2.8V LDO supplying core logic and PLL circuitry requiring low noise and fast transient recovery.

Use Value: 75dB ripple rejection prevents switching noise from DC/DC converters from degrading RF sensitivity and bit error rate.

Use Scenario: Supplying image signal processors (ISP) and CMOS image sensors in compact digital cameras.

IC Role / Device Role / Timing Role: Fixed 2.8V rail for sensor analog front-end and ISP I/O, enabled/disabled via host processor GPIO.

Use Value: Auto-discharge ensures rapid sensor power-down and eliminates ghost imaging from residual VOUT charge.

Battery-Powered Medical Sensors

Smart Home Control Units

Use Scenario: Providing regulated power to wearable ECG/PPG modules operating from single-cell Li-ion batteries.

IC Role / Device Role / Timing Role: Main system LDO delivering 2.8V to ultra-low-power microcontroller and analog signal chain.

Use Value: 0.1µA standby current extends battery life in multi-week monitoring applications without compromising wake-up responsiveness.

Use Scenario: Powering Zigbee/Thread SoCs and touch controller ICs in battery- or energy-harvesting–powered thermostats.

IC Role / Device Role / Timing Role: Always-on 2.8V supply with CE-controlled shutdown for firmware updates and wireless stack initialization.

Use Value: 0.23V dropout enables >90% battery utilization down to 3.03V input, maximizing runtime from 3.6V nominal cells.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP2210K-2.8TRG1	No auto-discharge; 600mA output; 250mV dropout at 500mA	Lacks active VOUT discharge; requires external circuitry for fast power-down	Select when auto-discharge is unnecessary and higher output current is required
Torex XC6219B282MR-G	200mA output; no auto-discharge; 150mV dropout at 200mA	Lower current rating; unsuitable for 500mA loads without derating	Select only for space-constrained, sub-200mA applications where footprint is critical

Compared with AP2210K-2.8TRG1 and XC6219B282MR-G, RP111H281D-T1-FE uniquely combines 500mA capability, 2.8V fixed output, and integrated auto-discharge-enabling simpler, more responsive power sequencing in portable electronics without external components.

Availability

RP111H281D-T1-FE is available at Aetrix Electronics and suitable for portable communication equipment, digital imaging devices, battery-powered medical sensors, and smart home control units requiring stable component supply and long-term design-in support.

Supply support for RP111H281D-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 power management ICs, including LDOs, DC/DC converters, and battery management solutions for industrial and consumer applications.

The RP111x series was designed specifically for high-transient-response, low-noise power delivery in space-constrained, battery-operated systems-emphasizing accuracy, efficiency, and integrated protection features.

FAQ

What is the purpose of the VFB pin on RP111H281D-T1-FE?

The VFB pin is the feedback input tied internally to a 0.7V reference. In fixed-output mode (like RP111H281D-T1-FE), it is shorted to VOUT to set 2.8V output. For adjustable configurations, external resistors connect VOUT to VFB to scale output voltage using VOUT = 0.7V × (1 + R1/R2), with accuracy dependent on resistor matching and VFB pin bias current.

Does RP111H281D-T1-FE require an output capacitor, and what type is recommended?

Yes, RP111H281D-T1-FE requires a minimum 1.0µF ceramic capacitor (X5R/X7R) between VOUT and GND for stability. Tantalum or aluminum electrolytic capacitors are not recommended due to ESR-related instability risks. For improved transient response, 2.2µF or higher is advised, especially in load-step scenarios exceeding 250mA.

How does the auto-discharge function operate, and when is it active?

The auto-discharge function activates only when CE is driven low (≤0.4V). It turns on an internal NMOS switch between VOUT and GND, rapidly discharging external output capacitance. This feature is inactive during normal operation (CE = H) and does not affect regulation accuracy, quiescent current, or dropout performance.

Can RP111H281D-T1-FE be used with input voltages below 1.4V?

No. The absolute minimum input voltage is 1.4V per datasheet specifications. Operation below this threshold may result in unregulated output, increased dropout, or failure to start. For sub-1.4V applications, consider alternative regulators such as Ricoh's RP108 series or other ultra-low-VIN LDOs explicitly rated for lower inputs.

RP111H281D-T1-FE Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

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):: 2.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.34V @ 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

RP111H281D-T1-FE FAQ

1.How can I place an order for RP111H281D-T1-FE through Aetrix?

Please submit a Request for Quotation (RFQ) for RP111H281D-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 RP111H281D-T1-FE reliable?

The price and inventory of RP111H281D-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 RP111H281D-T1-FE is usually 5 days.

3.What payment methods are accepted for RP111H281D-T1-FE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RP111H281D-T1-FE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RP111H281D-T1-FE?

RP111H281D-T1-FE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RP111H281D-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 RP111H281D-T1-FE?

For technical support, including RP111H281D-T1-FE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RP111H281D-T1-FE requirements.

6.How does Aetrix verify that RP111H281D-T1-FE is sourced from the original manufacturer or authorized distributors?

All RP111H281D-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 RP111H281D-T1-FE meets industry standards.

7.What is the process for return or replacement of RP111H281D-T1-FE?

All RP111H281D-T1-FE units undergo pre-shipment inspection (PSI). If there is an issue with RP111H281D-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 RP111H281D-T1-FE part is unused and in its original packaging.

Return procedure for RP111H281D-T1-FE:

1.Submit a request within 90 days.

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

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