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Diodes Incorporated AP1117T15G-U
- Part No.:
- AP1117T15G-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-220-3
- Datasheet:
-
AP1117T15G-U.pdf
- Description:
- IC REG LINEAR 1.5V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,812
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Product details
Overview
AP1117T15G-U from Diodes Incorporated is a 1A low-dropout linear voltage regulator in TO220-3L package, fixed 1.5V output, with ≤1.4V dropout at full load, ±2% output voltage accuracy, and integrated thermal shutdown. It delivers stable power to low-voltage logic circuits, high-speed bus terminations, and VGA card supplies under 6.4–18V input.
For engineers reviewing the AP1117T15G-U datasheet, AP1117T15G-U pinout, AP1117T15G-U application, or AP1117T15G-U equivalent, this page provides verified pin functions, real-world load regulation (≤15mV), thermal resistance (θJA = 78°C/W), noise rejection (60–70dB), and drop-in alternatives for 1.5V LDO replacement in industrial and PC peripheral designs.
Technical Context
The AP1117T15G-U uses an internal NPN pass transistor with bandgap reference and error amplifier to maintain regulation across 0–125°C junction temperature. Its fixed-output architecture eliminates external resistor networks, reducing BOM count and layout sensitivity compared to adjustable variants.
Designed for low-noise, low-transient-error operation, it achieves fast load transient response (<100µs recovery) and 60–70dB ripple rejection at 180Hz with 25µF tantalum output capacitance - critical for powering sensitive analog and mixed-signal ICs in embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±2% (1.47–1.53V) at 10mA, ensuring compatibility with 1.5V DDR termination and low-power microcontroller I/O rails. |
| Dropout Voltage | 1.4V max at 1A load, enabling regulation from 2.9V input - supports wide-input legacy supplies without requiring boost conversion. |
| Load Regulation | 15mV max (0–1A), minimizing output sag during CPU burst loads in PC peripherals and embedded controllers. |
| Ripple Rejection | 60–70dB at 180Hz, suppressing switching noise from upstream DC/DC converters feeding FPGA or DSP core supplies. |
| Thermal Shutdown | Activates at 150°C junction temperature, protecting against sustained overload or poor heatsinking in enclosed enclosures. |
| Quiescent Current | 5–10mA minimum load requirement, compatible with standby modes where downstream logic draws >10mA continuously. |
| Package | TO220-3L with tab-connected VOUT, enabling direct heatsink mounting for >1W dissipation in industrial ambient conditions. |
Pinout & Package
AP1117T15G-U is housed in a TO220-3L package with exposed thermal tab electrically connected to VOUT (Pin 2). The package supports up to 15W power dissipation with proper heatsinking and meets RoHS/lead-free requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Adj/GND) | Ground reference terminal | Internally tied to GND for fixed 1.5V version; must be connected to system ground plane for stability and thermal path continuity. |
| Pin 2 (VOUT) | Regulated output | Delivers 1.5V ±2%; tab is electrically connected to this pin - requires isolation from chassis ground unless VOUT is system common. |
| Pin 3 (VIN) | Unregulated input | Accepts 2.9–18V DC; must remain ≥1.3V above VOUT to sustain regulation; requires ≥10µF low-ESR capacitor (0.15–20Ω) at PCB pad. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 1.4V max at 1A enables use with marginal input margins - avoids need for higher-voltage rails or buck converters in space-constrained designs. |
| Fast transient response | Sub-100µs recovery from 100mA→1A load steps ensures stable supply to high-speed logic during clock domain transitions. |
| Integrated protection | Current limiting + thermal shutdown prevent latch-up or destruction during short-circuit or overheating events without external circuitry. |
| High PSRR | 60–70dB ripple rejection at 180Hz allows clean 1.5V rail derivation from noisy switcher outputs in multi-rail systems. |
| Fixed-output precision | ±2% output tolerance over temperature and line/load eliminates calibration overhead in cost-sensitive consumer and industrial applications. |
Applications
| VGA Graphics Card Power | PC Peripheral Logic Supply |
|---|---|
|
Use Scenario: Providing stable 1.5V termination voltage for high-speed digital video buses on discrete GPU cards. IC Role / Device Role / Timing Role: Fixed-output LDO delivering low-noise, low-drift bias to TMDS or LVDS receiver termination networks. Use Value: Maintains signal integrity by holding termination voltage within ±2% across temperature and load, preventing bit errors at 165MHz pixel clocks. |
Use Scenario: Powering USB hub controller I/O banks and EEPROM interfaces in desktop peripherals. IC Role / Device Role / Timing Role: Primary 1.5V rail generator with fast transient response to handle burst-mode USB enumeration current spikes. Use Value: Limits output droop to ≤15mV during 0→1A transients, ensuring reliable USB descriptor reads and enumeration timing compliance. |
| Industrial Sensor Interface | Legacy Embedded Controller Core |
|
Use Scenario: Supplying 1.5V reference and bias to precision ADC front-ends in factory automation sensors. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from digital switching noise via 70dB PSRR. Use Value: Enables <1 LSB INL error in 16-bit ADCs by suppressing 180Hz switching artifacts from shared 5V DC/DC converters. |
Use Scenario: Delivering core voltage to legacy ARM7 or ColdFire microcontrollers operating at 1.5V in industrial PLC modules. IC Role / Device Role / Timing Role: Main system regulator with thermal shutdown safeguarding against enclosure overheating during extended runtime. Use Value: Guarantees safe shutdown before junction exceeds 150°C, preventing firmware corruption or brown-out resets in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LD1117S15TR | 1A fixed 1.5V LDO; 1.2V dropout typ., SO-8 package; no thermal tab; θJA = 125°C/W. | Suitable for low-power, board-space-constrained designs without heatsinking; limited to ~0.8W continuous dissipation. | Select when PCB area is critical and thermal load <0.8W; avoid in TO220-replacement scenarios requiring >1W dissipation. |
| TLV1117-15CDCYR | 800mA fixed 1.5V LDO; 1.2V dropout typ.; SOT-223; built-in reverse-voltage protection. | Better suited for battery-powered or hot-swap applications where input reversal risk exists; lower current rating limits use in high-load VGA termination. | Choose for portable or field-serviceable equipment needing reverse-polarity immunity; not recommended for 1A VGA bus loads. |
Compared with LD1117S15TR and TLV1117-15CDCYR, AP1117T15G-U offers superior thermal performance (θJA = 78°C/W vs. 125/107°C/W) and full 1A delivery capability - making it the only option among the three qualified for sustained 1.5V/1A operation in thermally demanding industrial enclosures.
Availability
AP1117T15G-U is available at Aetrix Electronics and suitable for PC peripheral power, VGA graphics card termination, and industrial sensor interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AP1117T15G-U 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the US, serving industrial, computing, and communications markets.
The AP1117 product line delivers cost-optimized, thermally robust LDO regulators targeting high-current, low-noise power delivery in PC, graphics, and industrial control applications - emphasizing reliability under sustained load and wide input voltage range.
FAQ
What is the minimum input voltage required for AP1117T15G-U to regulate at 1.5V output?
The device requires VIN ≥ VOUT + 1.3V to maintain regulation, so minimum input is 2.8V. At full 1A load, dropout rises to 1.4V, meaning 2.9V input is recommended for margin. Below 2.8V, output collapses linearly with input.
Can AP1117T15G-U be used without an output capacitor?
No. A minimum 10µF capacitor with ESR between 0.15Ω and 20Ω is mandatory at VOUT for stability. Omitting it causes oscillation and potential damage. Tantalum or aluminum polymer capacitors are preferred over ceramic due to ESR requirements.
Is the thermal tab of AP1117T15G-U electrically isolated?
No. The tab is internally connected to Pin 2 (VOUT). When mounting to a heatsink, electrical isolation (e.g., mica washer + thermal grease) is required unless the heatsink is referenced to the 1.5V rail - a rare configuration in practice.
How does load regulation performance change across temperature?
Load regulation degrades slightly at extremes: typical deviation is ≤15mV from 0–1A at 25°C, but widens to ≤25mV at –40°C and 125°C per test data. This remains within 1.7% of nominal 1.5V, preserving logic-level compatibility.
AP1117T15G-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 1.5V
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-3
AP1117T15G-U FAQ
1.How can I place an order for AP1117T15G-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1117T15G-U 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 AP1117T15G-U reliable?
The price and inventory of AP1117T15G-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1117T15G-U is usually 5 days.
3.What payment methods are accepted for AP1117T15G-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1117T15G-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1117T15G-U?
AP1117T15G-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1117T15G-U 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 AP1117T15G-U?
For technical support, including AP1117T15G-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1117T15G-U requirements.
6.How does Aetrix verify that AP1117T15G-U is sourced from the original manufacturer or authorized distributors?
All AP1117T15G-U 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 AP1117T15G-U meets industry standards.
7.What is the process for return or replacement of AP1117T15G-U?
All AP1117T15G-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1117T15G-U, 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 AP1117T15G-U part is unused and in its original packaging.
Return procedure for AP1117T15G-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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