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PQ3RF33
Sharp Microelectronics
IC REG LINEAR 3.3V 3.5A TO220-4
2210 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 3.5A TO-220-4
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Minimum 1
5.0 / 5.0
- (500 Ratings)
PQ3RF33
Product Overview
7929240
DiGi Electronics Part Number
PQ3RF33-DGManufacturer
Sharp Microelectronics
PQ3RF33
Description
IC REG LINEAR 3.3V 3.5A TO220-4Inventory
2210 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 3.5A TO-220-4
Quantity
Minimum 1
Minimum 1
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PQ3RF33 Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Packaging
-
Series
-
Product Status
Obsolete
Output Configuration
Positive
Output Type
Fixed
Number of Regulators
1
Voltage - Input (Max)
10V
Voltage - Output (Min/Fixed)
3.3V
Voltage - Output (Max)
-
Voltage Dropout (Max)
0.5V @ 3A
Current - Output
3.5A
Current - Quiescent (Iq)
10 mA
PSRR
55dB (120Hz)
Control Features
Enable
Protection Features
Over Current, Over Temperature
Operating Temperature
-20°C ~ 80°C
Mounting Type
Through Hole
Package / Case
TO-220-4
Supplier Device Package
TO-220-4
Base Product Number
PQ3
Datasheet & Documents
Datasheets
Download PQ3RF33 Product Specification (PDF)
HTML Datasheet
PQ3RF33-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
425-1735-5
Standard Package
50
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
DiGi Electronics's prompt service and tough products significantly improve my experience.
December 02, 2025
Clear and transparent prices create a trustworthy shopping environment.
December 02, 2025
Their support team is quick, knowledgeable, and genuinely cares about customer success.
December 02, 2025
The peace of mind from sourcing from DiGi Electronics is unparalleled, thanks to their reliable inventory and support.
December 02, 2025
Shipment was quick, and the packaging was minimal yet effective, reducing waste.
December 02, 2025
I am consistently impressed with the reliability of the products I purchase from Di Digi Electronics, never facing any issues.
December 02, 2025
Shipping is fast and reliable, making my shopping hassle-free.
December 02, 2025
DiGi Electronics has been a trusted partner for our large-scale purchases.
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Frequently Asked Questions (FAQ)
Can I use the PQ3RF33 linear regulator as a direct replacement for an LM317 in a 5V-to-3.3V application requiring 3A output, and what are the key risks?
While both the PQ3RF33 and LM317 can deliver 3A, the PQ3RF33 is not a drop-in replacement due to fundamental architectural differences. The PQ3RF33 is a fixed 3.3V output regulator with an enable pin and requires only input/output capacitors, whereas the LM317 is adjustable and needs external resistors. More critically, the PQ3RF33 has a maximum input voltage of 10V—exceeding this (e.g., using a 12V supply common with LM317 designs) will damage the device. Additionally, the PQ3RF33’s dropout voltage is 0.5V at 3A, so your input must stay above 3.8V under load. If your design relies on adjustability or operates near 12V input, migrating to the PQ3RF33 introduces significant reliability risk; consider instead the fixed-output LT1086CT-3.3 or reevaluate your power architecture.
What thermal design considerations are critical when using the PQ3RF33 in a compact enclosure with limited airflow, and how do I avoid overheating at 3A load?
The PQ3RF33 dissipates up to (Vin – 3.3V) × 3A watts—for example, 5.1W at Vin = 5V and 3A—which demands careful thermal management. With a TO-220-4 package and typical junction-to-ambient thermal resistance (θJA) of ~50°C/W without a heatsink, the junction temperature can exceed 300°C in still air, far beyond its 80°C operating limit. You must attach a properly sized heatsink (target θSA < 10°C/W) and ensure good thermal contact with thermal paste. In enclosed spaces, add forced airflow or consider derating the output current. Monitor actual PCB copper area under the tab, as poor thermal vias or minimal copper will drastically reduce heat dissipation. Failing to address this risks thermal shutdown or premature failure.
Is the PQ3RF33 suitable for battery-powered systems where quiescent current matters, and how does its 10mA Iq compare to modern alternatives like the TPS7A4700?
The PQ3RF33’s 10mA quiescent current makes it poorly suited for battery-powered or low-power standby applications. For context, modern LDOs like the TPS7A4700 draw only 150µA Iq—over 60× less—significantly extending battery life in always-on systems. While the PQ3RF33 can deliver high current (3.5A), its static power loss alone consumes 33mW even at no load, which is unacceptable in energy-sensitive designs. If your application requires both high current and low idle consumption, consider switching to a buck converter (e.g., TPS54332) or a low-Iq LDO with sufficient current rating. Using the PQ3RF33 here introduces unnecessary runtime reduction and thermal burden without benefit.
Can I parallel two PQ3RF33 regulators to increase output current beyond 3.5A, and what stability or current-sharing issues should I anticipate?
Paralleling PQ3RF33 devices is not recommended due to lack of built-in current-sharing features and tight output voltage tolerances. Even minor mismatches in output voltage (±2% typical) cause one regulator to carry most of the load, leading to thermal imbalance and potential overcurrent failure. Unlike regulators with remote sensing or ballast resistors (e.g., LT3080), the PQ3RF33 lacks mechanisms to enforce equal current distribution. If higher current is needed, use a single higher-capability regulator such as the NCV8163AML330TCG (4A LDO) or switch to a synchronous buck converter like the MPQ4572. Attempting to parallel PQ3RF33 units risks uneven thermal stress and violates the device’s safe operating area under unbalanced conditions.
Since the PQ3RF33 is marked obsolete and non-RoHS, what are the long-term sourcing and compliance risks, and which RoHS-compliant alternatives offer similar performance?
Using the obsolete, non-RoHS PQ3RF33 poses serious supply chain and regulatory risks—especially for commercial or EU-market products. With no new production expected, inventory depletion could halt manufacturing, and its non-RoHS status may violate environmental regulations in many regions. For a compliant drop-in alternative, consider the Rohm BD9163FVM-3.3 (3.3V, 3A, TO-220, RoHS) or the Diodes Incorporated AP7381-33W5-13 (SOT-223, lower profile, 1A but scalable). For higher efficiency and availability, migrate to a modern switching regulator like the Texas Instruments TPS563300 (3A, 4.5–17V input, RoHS). Continuing with the PQ3RF33 without a qualified second source or redesign plan exposes your product to obsolescence-driven failures and compliance penalties.
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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.
PQ3RF33 CAD Models
Sharp Microelectronics PQ3RF33 PCB symbols & footprints
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