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Home > Products > Integrated Circuits (ICs) > Specialized ICs > R3111H331C-T1
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R3111H331C-T1

Manufacturer Part Number:
R3111H331C-T1
Manufacturer / Brand
RICOH
Part of Description:
RICOH SOT-89
Datasheets:
Lead Free Status / RoHS Status:
RoHS Compliant
Stock Condition:
New original, 6923 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number R3111H331C-T1
Manufacturer / Brand RICOH
Stock Quantity 6923 pcs Stock
Category Integrated Circuits (ICs) > Specialized ICs
Description RICOH SOT-89
Lead Free Status / RoHS Status: RoHS Compliant
RFQ R3111H331C-T1 Datasheets R3111H331C-T1 Details PDF
R3111H331C-T1 Details PDF for FR.pdf
R3111H331C-T1 Details PDF for KR.pdf
R3111H331C-T1 Details PDF for DE.pdf
R3111H331C-T1 Details PDF for IT.pdf
R3111H331C-T1 Details PDF for ES.pdf
Condition New Original Stock
Warranty 100% Perfect Functions
Lead Time 2-3days after payment.
Payment Credit Card / PayPal / Telegraphic Transfer (T/T) / Western Union
Shipping by DHL / Fedex / UPS / TNT
Port HongKong
RFQ Email Info@IC-Components.com

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

We can offer worldwide express delivery service, such as DHLor FedEx or TNT or UPS or other forwarder for shipment.

Global Shipment by DHL/FedEx/TNT/UPS

Shipping Fees reference DHL/FedEx
1). You can offer your express delivery account for shipment, ifyou haven’t any express account for shipment, we can offer our account inadvance.
2). Use our account for shipment, Shipment charges(Reference DHL/FedEx, Different Countries has different price.)
Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



We accept the payment terms: Telegraphic Transfer(T/T), Credit Card, PayPal and Western Union.

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PayPal Bank Information:
Company Name : IC COMPONENTS LTD
Paypal ID: Info@IC-Components.com

BANK TRANSFAR (Telegraphic Transfer)

Payment For Telegraphic Transfers:
Company Name : IC COMPONENTS LTD Beneficiary Account Number : 549-100669-701
Beneficiary Bank name : Bank of Communications (Hong Kong) Ltd Beneficiary Bank Code : 382 (for local payment)
Beneficiary Bank SWIFT : COMMHKHK
Beneficiary Bank Address : Tsuen Wan Market Street Branch 53 Market Street, Tsuen Wan N.T., Hong Kong

Any inquires or questions, please kindly contact us Email: Info@IC-Components.com


Frequently Asked Questions

Can the R3111H331C-T1 be used as a direct replacement for a linear regulator in a 3.3V power supply design without additional filtering components?
The R3111H331C-T1 is a 3.3V fixed-output LDO with a typical dropout voltage of 200mV and a maximum output current of 300mA. It can serve as a direct replacement for linear regulators with similar output specifications, provided the input voltage remains at least 3.5V to ensure stable operation. However, its low ESR capacitor requirement and lack of internal soft-start may necessitate external filtering or sequencing circuitry in designs sensitive to transients or inrush current.
What are the thermal implications when using the R3111H331C-T1 in an industrial environment with ambient temperatures up to 85°C?
The R3111H331C-T1 has a junction-to-ambient thermal resistance (θJA) of approximately 220°C/W in SOT-89 packaging. At full load and a 5V input with 3.3V output, power dissipation reaches 5.1W, resulting in a temperature rise of over 1,100°C—far exceeding safe limits. Therefore, continuous operation at high loads in elevated ambient temperatures requires either derating output current significantly or implementing heat sinking and airflow management.
Is the R3111H331C-T1 compatible with automatic optical inspection (AOI) in high-volume PCB assembly processes?
Yes, the R3111H331C-T1 is packaged in standard SOT-89, which is fully compatible with AOI systems. The component’s lead geometry, solderability, and placement tolerances meet industry standards for automated assembly. No special handling or reflow profile adjustments are required beyond those specified for lead-free soldering.
How does the startup behavior of the R3111H331C-T1 affect microcontroller reset circuits during power-up sequencing?
The R3111H331C-T1 lacks integrated soft-start functionality, leading to a rapid rise time typically under 50µs. This fast transient can cause voltage overshoot on the output, potentially triggering unintended resets in microcontrollers if their brown-out detection thresholds are not properly managed. Designers should verify that downstream ICs can tolerate this slew rate or consider adding RC delay networks at the enable pin or input stage to slow down the ramp.
Can the R3111H331C-T1 be safely operated near its maximum current rating in a compact IoT device with limited space?
Continuous operation at 300mA exceeds the recommended derating curve for long-term reliability, especially in small form-factor applications. In compact IoT devices, where convection cooling is minimal, operating above 200mA may lead to premature thermal failure. Engineers should limit sustained load to ≤200mA and monitor junction temperature via thermal modeling or empirical testing under actual enclosure conditions.
Are there any known compatibility issues between the R3111H331C-T1 and switching regulators in mixed-power architectures?
While the R3111H331C-T1 itself is a linear regulator, its fast transient response and lack of filtering may interact poorly with noisy switching supplies if not properly decoupled. Switching regulators generating high-frequency ripple could couple into the LDO’s feedback loop unless adequate input capacitance (≥10µF low-ESR ceramic) and layout isolation are implemented. Cross-talk risks increase when sharing ground planes or proximity is less than 5mm.
What precautions should be taken when migrating from the R3111H331C-T1 to another Ricoh LDO like the R3144 series?
Key differences include output voltage options, quiescent current, and shutdown current in the R3144 family. The R3111H331C-T1 offers only 3.3V fixed output, while the R3144 provides adjustable variants. Migration requires verifying voltage compatibility, adjusting feedback resistors if needed, and re-evaluating power consumption in sleep modes. Additionally, the R3144 typically includes better PSRR at higher frequencies, improving performance in noise-sensitive analog circuits.
Does the R3111H331C-T1 support hot-swapping applications commonly found in telecom or server backplanes?
Hot-swapping introduces inductive kickback and voltage surges that exceed the R3111H331C-T1’s absolute maximum ratings if unmitigated. Without built-in reverse-current protection or surge suppression, applying power while the load is active can damage the IC. External protection such as TVS diodes, PTC fuses, or MOSFET-based isolation stages must be added before considering hot-swap suitability.
How reliable is the R3111H331C-T1 over extended operational life in automotive-grade environments?
The R3111H331C-T1 is not qualified to automotive temperature grades (–40°C to +150°C). Operating near its upper commercial limit (–40°C to +85°C) accelerates electromigration in the pass transistor, reducing mean time between failures (MTBF). For long-term reliability in harsh environments, derating input voltage and output current by 20–30% is strongly advised to compensate for aging effects and thermal cycling stress.
Can the R3111H331C-T1 drive capacitive loads greater than 100µF without instability?
The R3111H331C-T1 is optimized for low-ESR ceramics and may become unstable when driving large electrolytic capacitors (>100µF) due to phase margin degradation. Adding a small series resistor (e.g., 1Ω) between the output and capacitor alleviates oscillation risk. Alternatively, using a low-dropout buffer or selecting an LDO with enhanced capacitive-load capability is recommended for such applications.

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R3111H331C-T1

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In Stock: 6923

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