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

Nexperia USA Inc. RP111L321D-TR

Name: RP111L321D-TR
Brand: Nexperia USA Inc.
SKU: RP111L321D-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RP111L321D-TR

Manufacturer:: Nexperia USA Inc.

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

Package:: 6-XFDFN Exposed Pad

Datasheet:: RP111L321D-TR.pdf

Description:: RP111L - Low Voltage Good Load T

Quantity:: RFQ Add To RFQ list

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Product details

Overview

RP111L321D-TR from Ricoh Electronic Devices is a CMOS-based low-dropout linear regulator with 500mA output current, 3.2V fixed output voltage, ±0.8% accuracy (≥1.8V), and built-in auto-discharge function. It operates from 1.4V to 5.25V input, achieves 0.22V dropout at 500mA/3.2V, and delivers 75dB ripple rejection at 1kHz-optimized for portable battery-powered systems requiring stable low-noise power.

For engineers reviewing the RP111L321D-TR datasheet, RP111L321D-TR pinout, RP111L321D-TR application, or RP111L321D-TR equivalent, key selection criteria include its DFN1212-6 package thermal performance (θ_JA = 167°C/W), 0.1µA standby current, ±30ppm/°C temperature coefficient, and verified load transient response (±45mV undershoot/overshoot with 1µF C_OUT).

Technical Context

The RP111L321D-TR integrates a precision bandgap reference, error amplifier, and low-R_DS(on) N-channel pass transistor (60Ω typ. for D-version) enabling fast line/load transient response. Its feedback loop uses internal V_FB = 0.7V with external resistor divider support for adjustable outputs up to 3.6V.

It implements three protection mechanisms: foldback current limiting (50mA short-circuit), thermal shutdown (165°C trip), and inrush current limiting (400mA peak for 180µs). The CE pin enables high-side logic control ("H" active), and the NC pin in DFN1212-6 requires no connection.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.2V ±0.8% (guaranteed over −40°C to +85°C)
Dropout Voltage	0.22V typ. at I_OUT = 500mA, V_OUT = 3.2V - enables operation with only 3.42V input
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
Output Noise	64µV_rms (3.2V × 20) - suitable for noise-sensitive analog/RF circuitry
Line Regulation	0.02%/V - ensures stable output across wide input variations

Pinout & Package

RP111L321D-TR is housed in a 1.2mm × 1.2mm DFN1212-6 package with exposed thermal pad (GND-connected substrate). The package supports high-density PCB layouts and provides 600mW power dissipation at T_A = 25°C with standard land pattern.

Pin/Terminal	Circuit Role	Design Meaning
1 VOUT	Regulated output terminal	Delivers 3.2V to load; requires ≥1.0µF ceramic capacitor (low ESR) for stability
2 VFB	Feedback input	Internally biased at 0.7V; connected directly to VOUT for fixed-output mode
3 GND	Ground reference	Primary return path; tab must be connected to PCB GND plane for thermal performance
4 CE	Chip enable input	Active-high logic control (V_CEH ≥ 1.0V); pulls output to 0V when low
5 NC	No connection	Not internally bonded; must remain unconnected and unrouted
6 VDD	Input supply	Accepts 1.4V–5.25V; requires ≥1.0µF ceramic decoupling capacitor near pin

Key Features

Feature	Design Value
Auto-discharge function	Actively discharges VOUT via internal NMOS when CE = L - prevents residual voltage in powered-off state
Low-noise regulation	20×V_OUT µV_rms (64µV_rms) - eliminates need for post-LDO filtering in audio/ADC supplies
Fast load transient response	±45mV max. undershoot/overshoot (I_OUT: 1mA ↔ 250mA, tr/tf = 0.5µs, C_OUT = 1µF) - maintains system stability during burst-mode operation
Thermal robustness	165°C thermal shutdown with 100°C hysteresis - protects against sustained overload or poor heatsinking
Ceramic capacitor compatibility	Stable with ≥1.0µF X5R/X7R ceramics - avoids cost/size penalties of tantalum or electrolytic capacitors

Applications

Portable Communication Equipment

Camera Power Management

Use Scenario: Powering RF transceivers and baseband processors in Bluetooth headsets and IoT sensors.

IC Role / Device Role / Timing Role: Primary 3.2V LDO supplying sensitive analog front-end and digital core logic.

Use Value: 75dB ripple rejection prevents switching noise from DC/DC converters from degrading RF sensitivity and ADC SNR.

Use Scenario: Supplying image sensor and ISP in compact digital cameras and action cams.

IC Role / Device Role / Timing Role: Low-noise 3.2V rail for CIS analog bias and pixel readout circuitry.

Use Value: 64µV_rms output noise avoids fixed-pattern noise and quantization errors in 12-bit+ imaging pipelines.

Battery-Powered Medical Devices

Smart Home Sensor Nodes

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

IC Role / Device Role / Timing Role: Always-on 3.2V supply with auto-discharge ensuring safe shutdown during battery replacement.

Use Value: 0.1µA standby current extends shelf life and operational runtime between charges.

Use Scenario: Powering Zigbee/Thread SoCs and environmental sensors (temp/humidity/pressure) in battery-operated smart plugs and thermostats.

IC Role / Device Role / Timing Role: High-efficiency 3.2V LDO enabling deep-sleep current <1µA while maintaining fast wake-up capability.

Use Value: 0.22V dropout allows >90% usable battery voltage range (3.42V–4.2V), maximizing energy extraction.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP2204K-3.2TRG1	Higher dropout (0.35V @ 500mA), no auto-discharge, SOT-23-5 package	Lacks active discharge; less suitable for safety-critical shutdown sequences	Select if board space permits larger package and auto-discharge is unnecessary
Torex XC6219B322MR-G	Lower I_Q (2.5µA), no thermal shutdown, same DFN1212-6 footprint	Missing overtemperature protection; requires external thermal monitoring	Select for ultra-low-quiescent applications where thermal risk is mitigated by system design

Compared with AP2204K-3.2TRG1 and XC6219B322MR-G, RP111L321D-TR uniquely combines auto-discharge, thermal shutdown, and 0.22V dropout in the compact DFN1212-6 package-making it optimal for space-constrained, safety-aware battery systems.

Availability

RP111L321D-TR is available at Aetrix Electronics and suitable for portable communication equipment, camera power management, battery-powered medical devices, and smart home sensor nodes requiring stable component supply with guaranteed long-term continuity.

Supply support for RP111L321D-TR 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 Electronic Devices Co., Ltd. is a Japanese semiconductor manufacturer specializing in power management ICs, including LDOs, DC/DC converters, and battery management solutions for consumer, industrial, and automotive markets.

The RP111x series was designed specifically for ultra-low-noise, high-transient-response power regulation in portable and battery-powered electronics-emphasizing minimal footprint, low quiescent current, and robust protection features.

FAQ

What is the purpose of the NC pin on RP111L321D-TR?

Pin 5 is designated NC (No Connection) and is not internally bonded. It must remain unconnected and un-routed on the PCB. Connecting it risks unintended electrical interaction or mechanical stress on the die bond wire. The DFN1212-6 package uses this pin position solely for mechanical symmetry and thermal pad alignment-not for signal or power routing.

Can RP111L321D-TR be used with tantalum output capacitors?

No-tantalum capacitors are not recommended. The RP111L321D-TR's internal compensation is optimized for ceramic capacitors ≥1.0µF with low ESR (e.g., Murata GRM155B31A105KE15). Tantalum capacitors exhibit higher ESR and capacitance drift over temperature/voltage, which can cause instability, oscillation, or excessive overshoot during load transients per the datasheet's Technical Notes section.

How does the auto-discharge function operate during shutdown?

When CE is driven low, the RP111L321D-TR activates an internal NMOS switch between VOUT and GND, discharging the output capacitor through a controlled path. This reduces VOUT to <0.1V within milliseconds, eliminating residual voltage that could interfere with downstream logic states or pose safety hazards during maintenance-distinct from passive discharge via load leakage.

What is the maximum allowable input voltage for continuous operation?

The absolute maximum input voltage is 6.0V, but continuous operation above 5.25V is not permitted. Per datasheet note ∗ on page 6, operation at 5.5V is restricted to ≤500 total hours over the device lifetime. For reliable long-term use, VIN must remain within 1.4V–5.25V under all operating conditions, including input ripple and surge margins.

RP111L321D-TR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: RP111x

Package/Case:: 6-XFDFN Exposed Pad

Packaging:: Bulk

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.25V

Voltage - Output (Min/Fixed):: 3.2V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.32V @ 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:: DFN1212-6

RP111L321D-TR FAQ

1.How can I place an order for RP111L321D-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for RP111L321D-TR 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 RP111L321D-TR reliable?

The price and inventory of RP111L321D-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RP111L321D-TR is usually 5 days.

3.What payment methods are accepted for RP111L321D-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RP111L321D-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RP111L321D-TR?

RP111L321D-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RP111L321D-TR 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 RP111L321D-TR?

For technical support, including RP111L321D-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RP111L321D-TR requirements.

6.How does Aetrix verify that RP111L321D-TR is sourced from the original manufacturer or authorized distributors?

All RP111L321D-TR 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 RP111L321D-TR meets industry standards.

7.What is the process for return or replacement of RP111L321D-TR?

All RP111L321D-TR units undergo pre-shipment inspection (PSI). If there is an issue with RP111L321D-TR, 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 RP111L321D-TR part is unused and in its original packaging.

Return procedure for RP111L321D-TR:

1.Submit a request within 90 days.

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

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