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Diodes Incorporated AP1117K18G-13
- Part No.:
- AP1117K18G-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
AP1117K18G-13.pdf
- Description:
- IC REG LINEAR 1.8V 1A TO263-2
- Quantity:
- Payment:
- Shipping:
Inventory:3,454
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Product details
Overview
AP1117K18G-13 from Diodes Incorporated is a 1A low-dropout linear voltage regulator with fixed 1.8V output, TO263-3L package, 1.4V max dropout at full load, ±1.5% output voltage accuracy, and integrated thermal shutdown. It delivers stable power to low-voltage logic circuits such as 1.8V FPGA I/O banks and DDR memory termination in embedded computing systems.
For engineers reviewing the AP1117K18G-13 datasheet, AP1117K18G-13 pinout, AP1117K18G-13 application, or AP1117K18G-13 equivalent, key selection criteria include dropout voltage under 1.4V at 1A, thermal resistance (θJC = 3.5°C/W), fixed 1.8V output tolerance, minimum load current of 5mA, and compatibility with 10µF–22µF output capacitors having ESR between 0.15Ω and 20Ω.
Technical Context
The AP1117K18G-13 uses a PNP pass transistor architecture with internal bandgap reference and error amplifier for precise 1.8V regulation. Its fast transient response is enabled by low output impedance and optimized compensation for ceramic/tantalum capacitors.
It operates across 3.3V to 12V input range while maintaining regulation down to 1.3V headroom (VIN ≥ VOUT + 1.3V). Built-in current limiting and thermal shutdown activate at 150°C junction temperature, ensuring safe operation during overload or ambient thermal stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.800 V ±1.5% (1.764–1.836 V) at 10mA, 25°C - ensures compatibility with 1.8V core logic supply rails |
| Dropout Voltage | 1.4 V max at 1A load - enables stable 1.8V output from as low as 3.2V input (e.g., single-cell LiFePO₄ or buck-boost pre-regulator) |
| Output Current | 1 A continuous - sufficient for powering multiple 1.8V I/O banks or small microcontrollers |
| Line Regulation | 0.2% - limits output variation to ±3.6 mV over full input range, critical for noise-sensitive analog interfaces |
| Load Regulation | 15–18 mV (0–1A) - maintains tight voltage control during dynamic current steps in digital loads |
| Ripple Rejection | 60–70 dB at 180 Hz - suppresses switching noise from upstream DC/DC converters feeding the LDO |
| Thermal Resistance θJC | 3.5 °C/W - allows >10W dissipation before thermal shutdown when mounted on heatsinked PCB copper |
Pinout & Package
AP1117K18G-13 is housed in a TO263-3L (D²PAK) thermally enhanced surface-mount package with exposed metal tab electrically connected to VOUT. The tab serves as both thermal path and output terminal, requiring proper solder pad area per Diodes Inc. AP02001 layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj/GND) | Ground reference / Adjustment node | Internally tied to GND for fixed-output variants; must be connected to ground plane for stability and thermal conduction |
| 2 (VOUT) | Regulated output | Primary power output; electrically bonded to exposed tab - requires low-impedance connection to 10–22 µF output capacitor and ground plane |
| 3 (VIN) | Unregulated input | Accepts 3.3–12V input; requires local 10 µF input capacitor near pin to limit surge current and reduce PSRR degradation |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 1.4 V max at 1A - enables high-efficiency operation with minimal input–output differential, reducing power loss and heat generation |
| Fast transient response | Sub-100 µs recovery from 100 mA → 1 A load step - prevents brownout during processor wake-up or burst-mode memory access |
| Built-in thermal shutdown | Activates at 150°C junction temperature and auto-recovers upon cooling - eliminates need for external thermal monitoring circuitry |
| Output current limiting | 1.1 A typical short-circuit current - protects downstream circuitry and PCB traces during fault conditions without latch-up |
| Good noise rejection | 70 dB ripple rejection at 180 Hz - maintains clean 1.8V rail for ADC references and PLL power domains |
Applications
| PC Peripheral Power | VGA Card Core Supply |
|---|---|
|
Use Scenario: Providing regulated 1.8V to PCIe interface logic and USB controller I/O banks in desktop add-in cards. IC Role / Device Role / Timing Role: Primary post-regulator delivering low-noise, tightly regulated 1.8V from intermediate 3.3V or 5V rail. Use Value: Ensures signal integrity on high-speed serial links by suppressing switching noise from upstream DC/DC converters via 70 dB ripple rejection. |
Use Scenario: Powering GPU memory interface and display controller logic in legacy VGA graphics cards. IC Role / Device Role / Timing Role: Fixed-output LDO supplying stable 1.8V to DDR SDRAM termination and TMDS transmitter circuitry. Use Value: Maintains <±18 mV load regulation across 0–1A load swings, preventing timing skew in pixel clock distribution networks. |
| Embedded Logic Rail | Industrial Sensor Interface |
|
Use Scenario: Generating 1.8V for ARM Cortex-M4 microcontroller I/O banks and external flash memory in industrial gateways. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling MCU from noisy system power bus. Use Value: Delivers 1A continuous current with 1.4V dropout, enabling use with 3.3V buck converter outputs while preserving margin for line/load transients. |
Use Scenario: Powering precision analog front-end (AFE) ICs and 1.8V ADC reference buffers in condition-monitoring sensors. IC Role / Device Role / Timing Role: Low-noise voltage source for sensitive analog signal chains requiring stable reference voltage. Use Value: Achieves ±0.5% temperature stability over –40°C to +125°C, minimizing offset drift in calibrated sensor outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC29302WU-1.8 | 2.5A output, higher quiescent current (35 mA vs. 10 mA), TO263-5 package with separate GND pin | Supports higher-current loads but requires larger PCB footprint and lacks integrated thermal shutdown flag | Select when >1A load or tighter thermal monitoring is required; verify GND routing compatibility |
| TLV1117-18CDCYR | 800 mA output, SOT-223-3 package, 1.2V dropout at 800 mA, ±2% output tolerance | Lower cost and smaller footprint, but insufficient for 1A applications and less accurate output | Choose only for space-constrained designs with ≤800 mA load and relaxed voltage tolerance requirements |
Compared with MIC29302WU-1.8 and TLV1117-18CDCYR, AP1117K18G-13 uniquely balances 1A capability, 1.4V dropout, ±1.5% accuracy, and integrated thermal protection in TO263-3L - making it optimal for mid-power industrial and embedded 1.8V rail generation where reliability and thermal robustness are prioritized over ultra-low IQ or ultra-small size.
Availability
AP1117K18G-13 is available at Aetrix Electronics and suitable for PC peripheral power, VGA card core supply, embedded logic rail, and industrial sensor interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AP1117K18G-13 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP1117 series was designed specifically for low-noise, medium-current voltage regulation in space-constrained embedded systems - emphasizing thermal robustness, fast transient response, and compatibility with standard ceramic and tantalum output capacitors.
FAQ
What is the minimum input voltage required for AP1117K18G-13 to regulate at 1.8V?
The device requires VIN ≥ VOUT + 1.3V to maintain regulation, so minimum input is 3.1V. At full 1A load, dropout rises to 1.4V, meaning 3.2V input is recommended for guaranteed performance across temperature and process variation. Input below this threshold causes output to track input minus dropout.
Can AP1117K18G-13 be used with ceramic output capacitors?
Yes - the regulator is stable with 10µF–22µF ceramic capacitors having ESR between 0.15Ω and 20Ω. Diodes Inc. confirms stability with X5R/X7R types; avoid ultra-low-ESR (<0.1Ω) ceramics unless verified with phase-margin testing, as they may induce oscillation.
Is the exposed tab on AP1117K18G-13 electrically connected, and how should it be handled?
Yes, the TO263-3L tab is internally connected to the VOUT pin. It must be soldered to a large copper pour serving as both thermal sink and output power plane. Do not isolate the tab - doing so degrades thermal performance and violates the recommended layout in AP02001, risking thermal shutdown under load.
Does AP1117K18G-13 require an external bypass capacitor on the ADJ/GND pin?
No - the ADJ/GND pin is internally connected to ground for fixed-output versions like AP1117K18G-13. No external components are needed on this pin. Its sole function is mechanical and thermal grounding; adding capacitance here provides no benefit and may impair thermal conduction.
AP1117K18G-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.4V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (180Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263
AP1117K18G-13 FAQ
1.How can I place an order for AP1117K18G-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1117K18G-13 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AP1117K18G-13 reliable?
The price and inventory of AP1117K18G-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1117K18G-13 is usually 5 days.
3.What payment methods are accepted for AP1117K18G-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1117K18G-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1117K18G-13?
AP1117K18G-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1117K18G-13 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AP1117K18G-13?
For technical support, including AP1117K18G-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1117K18G-13 requirements.
6.How does Aetrix verify that AP1117K18G-13 is sourced from the original manufacturer or authorized distributors?
All AP1117K18G-13 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP1117K18G-13 meets industry standards.
7.What is the process for return or replacement of AP1117K18G-13?
All AP1117K18G-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1117K18G-13, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AP1117K18G-13 part is unused and in its original packaging.
Return procedure for AP1117K18G-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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