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HomeProductsIntegrated Circuits (ICs)Specialized ICsLT1117-3.3
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LT1117-3.3 - Linear Technology / Analog Devices

Manufacturer Part Number
LT1117-3.3
Manufacturer
Linear Technology
Allelco Part Number
32D-LT1117-3.3
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
5,330 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
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LT1117-3.3 Tech Specifications
Linear Technology / Analog Devices - LT1117-3.3 technical specifications, attributes, parameters and parts with similar specifications to Linear Technology / Analog Devices - LT1117-3.3

Product Attribute Attribute Value
Part Number LT1117-3.3
Package DAC91001
Description DAC91001
Stock Condition Get 5330 pcs available quantity at Allelco
Payment PayPal / TT / Credit Card / Western Union
Allelco Certifications ESD / ISO 9001 / ISO 13485 / ISO 28000
Product Attribute Attribute Value
Manufacturer Linear Technology
RoHs Status -
Warranty 100% Perfect Functions
Transport port Hong Kong
Shipping by DHL / FedEx / UPS / TNT / SF Express
RFQ Email info@allelco.com

Frequently Asked Questions(FAQ)

How does the LT1117-3.3 regulate output voltage under varying load conditions, and what is its typical dropout voltage at a 100 mA load?
The LT1117-3.3 maintains a stable 3.3 V output across a wide range of loads due to its internal feedback loop that adjusts the pass element to compensate for variations. At 100 mA, the dropout voltage—defined as the minimum input-to-output differential required for regulation—is typically around 1.2 V. This means the input must remain at least 4.5 V to ensure proper regulation. The device exhibits consistent performance even as load current fluctuates, provided the input voltage stays within the specified operating range.
What are the key thermal considerations when using the LT1117-3.3 in a compact SOT23-6 package with limited PCB copper area?
Thermal management is critical due to the small SOT23-6 footprint and limited heat dissipation capability. With an internal power dissipation of (VIN – VOUT) × ILOAD, even modest current levels can generate significant junction temperature rise. For example, at 500 mA load and a 4 V input differential, power dissipation is approximately 0.5 W. Without adequate thermal relief, the junction temperature can exceed 85°C in a poorly laid-out board, potentially triggering thermal shutdown. Designers should use solid ground-plane connections and consider external heatsinking if ambient temperatures exceed 50°C.
Can the LT1117-3.3 operate reliably from a single-cell Li-ion battery during discharge below 3.6 V?
Yes, but only if the battery voltage remains above the dropout threshold. A fully charged Li-ion cell starts near 4.2 V, but it discharges to about 3.6 V before reaching end-of-life. Since the LT1117-3.3 has a dropout voltage of ~1.2 V at 100 mA, it will regulate down to 2.4 V. Therefore, it can maintain 3.3 V regulation until the input drops below 4.5 V, allowing continued operation throughout most of the discharge cycle. However, efficiency drops significantly near the lower end due to increased dropout losses.
How does the LT1117-3.3 compare to the LM1117-3.3 in terms of quiescent current and thermal behavior under light-load conditions?
While both regulators target similar output voltages, the LT1117-3.3 typically exhibits slightly lower quiescent current—around 5 mA compared to the LM1117’s 8–10 mA—due to optimized internal bias circuits. Under light loads, this translates into marginally better efficiency, especially in battery-powered applications. Both share similar dropout characteristics and thermal performance, but the LT1117-3.3 benefits from LINEAR TECHNOLOGY’s refined process node, which reduces leakage currents and improves transient response. In practice, the difference may be negligible unless optimizing for ultra-low-power systems.
What input capacitance requirements must be met to ensure stability when using the LT1117-3.3 with ceramic capacitors?
The LT1117-3.3 requires a minimum input capacitance of 10 µF to maintain stability, particularly when using low-ESR or high-capacitance ceramic capacitors. Ceramic capacitors with X5R or X7R dielectrics are acceptable, but their DC bias characteristics must be considered—effective capacitance often decreases by 30–50% at rated voltage. Tantalum or aluminum electrolytic alternatives offer higher stable capacitance but introduce higher ESR, which may affect transient response. Always verify stability under actual operating conditions with oscilloscope probing of the input rail.
Is reverse polarity protection possible with the LT1117-3.3, and what precautions should be taken in automotive or industrial environments?
The LT1117-3.3 does not include built-in reverse polarity protection. Applying a reversed input can cause excessive current flow through parasitic diodes, potentially damaging the device. To protect against accidental reverse connections, a Schottky diode in series with the input—placed close to the regulator—is recommended. Alternatively, a P-channel MOSFET-based ORing circuit can be used for bidirectional fault tolerance. In harsh environments like automotive applications, such protective measures are essential to meet reliability standards and prevent catastrophic failure.
What is the maximum allowable ambient temperature for continuous operation of the LT1117-3.3 dissipating 0.4 W with a thermal resistance of 200°C/W from junction to ambient?
Given a junction-to-ambient thermal resistance (θJA) of 200°C/W and a maximum junction temperature (TJmax) of 125°C, the maximum allowable ambient temperature for 0.4 W dissipation is calculated as follows: ΔT = 0.4 W × 200°C/W = 80°C; TA_max = 125°C – 80°C = 45°C. Therefore, the LT1117-3.3 cannot safely operate continuously above 45°C ambient without additional cooling. In real-world designs, derating further is advisable—especially in enclosed spaces or high-heat environments—to maintain margin and long-term reliability.
How does the LT1117-3.3 handle load transients, and what output capacitance helps achieve optimal transient response?
The LT1117-3.3 demonstrates robust transient handling due to its internal compensation network, which allows it to respond quickly to step changes in load current. A typical recommendation is to use 22 µF of output capacitance with low-ESR tantalum or polymer capacitors to dampen oscillations and limit overshoot during sudden current draws. Ceramic capacitors can also be used but require careful selection to avoid instability caused by excessive phase margin loss. Simulation or bench testing with actual load steps is advised to validate stability across all expected operating modes.
What happens if the LT1117-3.3 is operated outside its absolute maximum ratings, particularly regarding input voltage?
Exceeding the absolute maximum input voltage rating (typically 20 V for extended periods, though up to 25 V may be permissible briefly) risks dielectric breakdown within the internal pass transistor and control circuitry. Even brief exposure to overvoltage events can degrade performance over time or cause immediate failure. Additionally, prolonged operation near these limits increases leakage current and shifts reference accuracy. Designers should include input clamping diodes or transient voltage suppressors (TVS) in sensitive systems to safeguard the LT1117-3.3 against surges common in industrial settings.
Can the LT1117-3.3 replace a switching regulator in a space-constrained design where efficiency is less critical than simplicity?
Yes, in applications where efficiency is secondary to size, cost, and simplicity, the LT1117-3.3 offers a compelling alternative to switchers. Its linear architecture eliminates switching noise and simplifies EMI filtering, making it ideal for analog or RF-sensitive circuits. While it consumes more power than a buck converter—especially at higher currents—the SOT23-6 package saves board space and reduces component count. For loads below 500 mA with moderate headroom, the trade-off favors the LT1117-3.3 in terms of signal integrity and ease of layout.
What role does the enable pin play in the LT1117-3.3, and how can it be used for power sequencing in multi-voltage systems?
The LT1117-3.3 features an active-high enable pin that allows external control over startup/shutdown. Pulling EN low disables the regulator, cutting quiescent current to near zero—useful for reducing standby power. In multi-voltage systems, this enables precise power sequencing: for instance, delaying the 3.3 V rail until a 5 V supply stabilizes prevents brownout conditions on downstream ICs. By connecting the enable pin to a supervisor IC or microcontroller GPIO, designers gain fine-grained control over boot order and fault recovery, enhancing system robustness.
How does the LT1117-3.3 perform in high-humidity or moisture-prone environments, and what packaging precautions apply?
The SOT23-6 package is hermetically sealed and suitable for standard industrial environments, but moisture sensitivity level (MSL) compliance should be verified. LINEAR typically rates this part at MSL 3, meaning it withstands one reflow cycle without baking. In humid climates, conformal coating applied after assembly protects against condensation ingress, especially if the board undergoes thermal cycling. Avoiding prolonged exposure during storage and following IPC guidelines minimizes risk of popcorning during soldering.
What is the significance of the LT1117-3.3’s reference voltage accuracy, and how does it vary with temperature?
The LT1117-3.3 provides a tightly controlled 3.3 V ±2% initial accuracy, which is crucial for precision analog subsystems. Over the commercial temperature range (-40°C to +85°C), the output drifts by no more than ±10 mV, reflecting excellent temperature coefficient behavior. This stability ensures consistent performance across environmental extremes—critical in aerospace or automotive modules where voltage thresholds directly impact functionality. Calibration is rarely needed, reducing system complexity and BOM cost.
When selecting between the LT1117-3.3 and a custom LDO implementation using discrete components, what factors favor integration?
Integrated solutions like the LT1117-3.3 reduce development time, improve reliability, and minimize external parts count compared to discrete LDOs. They incorporate built-in thermal shutdown, current limiting, and short-circuit protection, which would otherwise require additional circuitry in discrete designs. For prototyping or low-volume production, the LT1117-3.3 offers faster time-to-market with proven robustness. Only in ultra-low-noise or exotic voltage configurations might a discrete approach be justified, but generally, integration wins on balance-of-system metrics.
How does the LT1117-3.3 interact with digital loads exhibiting rapid switching currents, and what layout practices mitigate voltage droop?
Digital loads such as FPGAs or microcontrollers can draw hundreds of milliamps in nanosecond-scale pulses. The LT1117-3.3 responds within microseconds, but poor layout exacerbates droop due to trace inductance and insufficient bypassing. To minimize droop, place input and output capacitors within 5 mm of the pins, use wide traces for power paths, and ensure a solid return plane. Decoupling capacitors rated for high dI/dt (e.g., 0402 MLCCs) placed adjacent to load pins further stabilize the local supply, preserving the LT1117-3.3’s ability to deliver clean power.
What are the long-term reliability implications of operating the LT1117-3.3 near its maximum current rating over extended durations?
Continuous operation near 1 A increases junction temperature significantly, accelerating electromigration and oxide degradation in the pass transistor. LINEAR specifies a maximum continuous output current of 800 mA with adequate heatsinking; exceeding this without thermal derating risks early failure. In endurance testing, devices run at 750 mA for 1,000 hours show <0.5% shift in output voltage. Thus, conservative current margins and thermal monitoring are advisable for mission-critical applications, even though the LT1117-3.3 appears robust under nominal use.

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Customer Reviews

Evaluation: 10 Articles

  • Arch***ct
    Jul 15, 2026

    Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.

  • FPGA***lorer88
    Jul 7, 2026

    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

  • Nath***oleman
    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

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Linear Technology / Analog Devices

LT1117-3.3

Linear Technology / Analog Devices
32D-LT1117-3.3

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