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LM5166YDRCT
Texas Instruments
IC REG BUCK 3.3V 500MA 10VSON
30381 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 3.3V 1 Output 500mA 10-VFDFN Exposed Pad
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5.0 / 5.0
- (376 Ratings)
LM5166YDRCT
Product Overview
1366031
DiGi Electronics Part Number
LM5166YDRCT-DGManufacturer
Texas Instruments
LM5166YDRCT
Description
IC REG BUCK 3.3V 500MA 10VSONInventory
30381 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 3.3V 1 Output 500mA 10-VFDFN Exposed Pad
Quantity
Minimum 1
Minimum 1
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LM5166YDRCT Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Fixed
Number of Outputs
1
Voltage - Input (Min)
3V
Voltage - Input (Max)
65V
Voltage - Output (Min/Fixed)
3.3V
Voltage - Output (Max)
-
Current - Output
500mA
Frequency - Switching
50kHz ~ 600kHz
Synchronous Rectifier
Yes
Operating Temperature
-40°C ~ 150°C (TJ)
Mounting Type
Surface Mount
Package / Case
10-VFDFN Exposed Pad
Supplier Device Package
10-VSON (3x3)
Base Product Number
LM5166
Datasheet & Documents
Manufacturer Product Page
LM5166YDRCT Specifications
Design Resources
Ultrasonic Distance Sensor With IO-Link
HTML Datasheet
LM5166YDRCT-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-48925-6
296-48925-2
LM5166YDRCT-DG
296-48925-1
Standard Package
250
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
Excellent customer service! The team at DiGi Electronics is very responsive and helpful.
de desembre 02, 2025
The consistency and transparency at DiGi Electronics create a positive and trustworthy shopping environment.
de desembre 02, 2025
Their budget-friendly options prove you don't have to overspend to get quality.
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Frequently Asked Questions (FAQ)
Can the LM5166YDRCT be safely used as a drop-in replacement for the LM5165YDRCT in a 48V-to-3.3V industrial sensor power supply, and what design risks should I evaluate before making the switch?
While both the LM5166YDRCT and LM5165YDRCT are 65V-input buck regulators from Texas Instruments with similar pinouts and packages, the LM5166YDRCT has a higher minimum on-time and different compensation network requirements, which can affect stability in low-duty-cycle applications like 48V-to-3.3V conversion. Before replacing the LM5165YDRCT, verify that your switching frequency setting (via RT resistor) and compensation components (RC and CC) are re-optimized for the LM5166YDRCT’s control loop dynamics. Additionally, confirm that the peak current limit and thermal performance under your load profile meet requirements—miscompensation could lead to subharmonic oscillation or excessive output ripple, especially near the 3V minimum input condition.
What are the critical layout considerations when designing a PCB for the LM5166YDRCT in a high-vibration automotive environment, and how does the 10-VSON exposed pad impact reliability?
The LM5166YDRCT’s 10-VSON (3x3) package with an exposed thermal pad demands a solid, low-impedance ground connection through multiple vias to the inner ground plane to ensure both thermal dissipation and mechanical stability. In high-vibration environments, poor solder joint integrity at the exposed pad can lead to intermittent operation or premature failure. Use a symmetrical via pattern (e.g., 4–6 vias of 0.3mm diameter) under the pad and avoid thermal reliefs that reduce solder flow. Also, keep high-di/dt loops (input cap, SW node, inductor) as small as possible to minimize radiated noise and mechanical stress on passives. TI’s recommended layout in the datasheet should be followed precisely—deviations increase susceptibility to EMI and reduce MTBF in automotive applications.
How does the synchronous rectification in the LM5166YDRCT affect efficiency at light loads compared to non-synchronous alternatives like the TPS54360DDAR, and when might forced PWM mode become necessary?
The LM5166YDRCT uses synchronous rectification, which improves full-load efficiency but can reduce light-load efficiency due to continuous inductor current and gate drive losses. In contrast, the TPS54360DDAR (a non-synchronous buck) may perform better at very light loads (<10mA) because it avoids body diode conduction losses during dead time. However, the LM5166YDRCT supports pulse-frequency modulation (PFM) at light loads to mitigate this. If your application requires tight output voltage regulation under dynamic loads (e.g., IoT devices with sleep/wake cycles), enable forced PWM mode by pulling the MODE pin high—this eliminates output voltage ripple caused by PFM skipping but increases quiescent current. Evaluate the trade-off between battery life and noise sensitivity before selecting the operating mode.
Is the LM5166YDRCT suitable for 24V industrial systems where input transients can exceed 80V, and what external protection circuitry is recommended to prevent damage?
Although the LM5166YDRCT has a 65V maximum input rating, industrial 24V systems often experience load-dump or inductive kick transients exceeding 80V. Using it without protection risks catastrophic failure. To safely deploy the LM5166YDRCT in such environments, add a transient voltage suppressor (TVS) diode rated for >70V clamping (e.g., SMAJ58A) close to the VIN pin, along with a series input fuse and a bulk capacitor with sufficient voltage margin (≥100V). A pre-regulator or active clamp circuit may be necessary for sustained overvoltage conditions. Always validate transient response with an oscilloscope during surge testing—TI’s ‘Power Stage Protection’ application note (SLVA863) provides validated reference designs for harsh industrial inputs.
What reliability concerns should I consider when operating the LM5166YDRCT near its 150°C junction temperature limit in a sealed enclosure with limited airflow?
Operating the LM5166YDRCT near 150°C TJ accelerates electromigration and reduces long-term reliability, especially in sealed enclosures where convective cooling is absent. Even though the device is rated for 150°C, sustained operation above 125°C significantly shortens mean time between failures (MTBF). Use a thermal resistance model (θJA ≈ 40°C/W in typical 4-layer PCB) to estimate junction temperature under worst-case ambient and load conditions. If TJ exceeds 130°C, consider reducing switching frequency (to lower switching losses), increasing copper area under the exposed pad, or adding a small heatsink. Monitor aging effects like increased RDS(on) of the internal FETs over time—TI’s reliability reports show that derating to ≤125°C TJ improves field longevity by 3–5x in mission-critical applications.
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LM5166YDRCT CAD Models
Texas Instruments LM5166YDRCT PCB symbols & footprints
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