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PQ1R28
Sharp Microelectronics
IC REG LIN 2.8V 150MA SOT23L-6
50137 Pcs New Original In Stock
Switching Regulator IC Output
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*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (68 Ratings)
PQ1R28
Product Overview
5824922
DiGi Electronics Part Number
PQ1R28-DGManufacturer
Sharp Microelectronics
PQ1R28
Description
IC REG LIN 2.8V 150MA SOT23L-6Inventory
50137 Pcs New Original In Stock
Switching Regulator IC Output
Quantity
Minimum 1
Minimum 1
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PQ1R28 Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
Cut Tape (CT)
Series
*
Product Status
Obsolete
Base Product Number
PQ1R28
Datasheet & Documents
Datasheets
Download PQ1R28 Product Specification (PDF)
HTML Datasheet
PQ1R28-DG
Environmental & Export Classification
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
425-PQ1R28TR
425-1659-2
425-1659-1
Standard Package
5,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
經濟實惠，環保用心，DiGi Electronics是我心中最棒的選擇！
December 02, 2025
Le support client est sympathique et professionnel, ils ont toujours répondu à mes questions avec patience.
December 02, 2025
Die sorgfältige Verpackung bei DiGi Electronics ist für mich ein großes Plus. Außerdem sind die Preise sehr günstig.
December 02, 2025
DiGi Electronics’ fast shipping made my purchase seamless, and their products have lasted through rough handling.
December 02, 2025
Never had a problem with delivery times, which makes shopping relaxing.
December 02, 2025
Customer support links are easy to find, and the overall site provides a trustworthy shopping environment.
December 02, 2025
Support staff was patient and understanding, which I really appreciated.
December 02, 2025
Their packaging solutions are innovative and tailored to ensure safe transit.
December 02, 2025
Their budget-friendly prices and dedicated support staff give me peace of mind after every purchase.
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Frequently Asked Questions (FAQ)
Can the PQ1R28 linear regulator be used as a drop-in replacement for the AP2112K-2.8TRG1 in a space-constrained portable design, and what are the key differences I should watch for?
The PQ1R28 and AP2112K-2.8TRG1 both provide a 2.8V fixed output, but they differ significantly in architecture and performance. The PQ1R28 is a linear regulator with lower noise and simpler layout requirements, while the AP2112K-2.8TRG1 is a switching regulator offering higher efficiency, especially under high input-to-output voltage differentials. Replacing the AP2112 with the PQ1R28 risks higher power dissipation and thermal issues in battery-powered applications where efficiency matters. Use PQ1R28 only if your design operates at low load currents (≤100mA) and has sufficient thermal margin on the PCB. Always verify dropout voltage under your minimum input voltage condition to ensure stable 2.8V output with PQ1R28.
Is the PQ1R28 suitable for automotive applications despite being marked as obsolete, and how can I mitigate long-term supply and reliability risks?
While the PQ1R28 is not recommended for new automotive designs due to its obsolete status, it may still be used in repair or legacy production runs. However, sourcing from authorized stock (like the 50,100 pcs available) with verified authenticity mitigates counterfeit risk. For reliability, perform accelerated life testing and include derating—operate at ≤75% of max current (112.5mA) and ensure junction temperature stays below 100°C. Consider redesigning with AEC-Q100-compliant alternatives like the TPS7A02DGKR if long-term availability and automotive qualification are required.
How do I handle PCB layout and thermal dissipation for the PQ1R28 in a dense SOT23L-6 footprint without a thermal pad?
The PQ1R28 in SOT23L-6 lacks an exposed thermal pad, limiting its ability to dissipate heat through the PCB. To prevent thermal runaway, minimize copper pour under the package and instead use thermal vias in adjacent pads to transfer heat to internal ground planes. Keep high-current traces short and wide. At 150mA maximum load, calculate power dissipation as (VIN - 2.8V) × 0.15A; if this exceeds 200mW, consider adding an external heat sink or reducing ambient temperature. Simulate thermal performance in your final enclosure to ensure safe operation over temperature extremes.
What are the stability and transient response limitations of the PQ1R28 when powering a low-power RF transceiver with burst-mode current draw?
The PQ1R28, as a linear regulator, offers good noise performance but has limited transient response compared to low-ESR LDOs with dedicated bypass capacitors. RF transceivers with burst loads (e.g., nRF24L01) can cause output voltage droop if the input and output capacitance isn’t optimized. Use a minimum 1μF X5R ceramic capacitor on both input and output, placed within 3mm of the PQ1R28 pins, and consider adding a 10μF tantalum or polymer cap in parallel for bulk hold-up. Monitor output ripple under dynamic load; if overshoot or droop exceeds ±5%, re-evaluate with a faster transient response LDO like the MCP1703-2802E/TO.
Can I use the PQ1R28 in a multi-regulator power chain where its input is supplied by a noisy DC-DC converter, and what filtering is recommended?
Yes, the PQ1R28 can effectively filter noise from a preceding switching regulator, leveraging its inherent PSRR (power supply rejection ratio), but effectiveness depends on frequency and load. At low frequencies (≤100kHz), PQ1R28’s PSRR helps attenuate ripple, but performance degrades at higher frequencies. To improve filtering, add a small ferrite bead (e.g., BLM18AG102SN1) in series with the input and a 1–2.2μF low-ESR ceramic capacitor. Avoid over-filtering, which may destabilize the upstream switcher. Simulate or measure output ripple under max load to ensure PQ1R28 maintains regulation and doesn’t introduce oscillation due to poor input impedance matching.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
PQ1R28 CAD Models
Sharp Microelectronics PQ1R28 PCB symbols & footprints
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