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Diodes Incorporated AP1117TG-U
- Part No.:
- AP1117TG-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-220-3
- Datasheet:
-
AP1117TG-U.pdf
- Description:
- IC REG LINEAR POS ADJ 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,664
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Product details
Overview
AP1117TG-U from Diodes Incorporated is a 1A low-dropout positive linear regulator in TO220-3L package, configurable as fixed 3.3V output or adjustable mode via external resistor divider. It delivers ≤1.4V dropout at full load, supports 6.4–18V input, and maintains regulation with ≥1.3V VIN–VOUT differential. Used in VGA cards, high-speed bus termination, and 3.3V logic supply rails.
For engineers reviewing the AP1117TG-U datasheet, AP1117TG-U pinout, AP1117TG-U application, or AP1117TG-U equivalent, key selection criteria include dropout voltage at 1A, thermal shutdown behavior, output voltage accuracy (±1% for fixed 3.3V), minimum load current requirement (5–10mA), and TO220-3L thermal resistance (θJA = 78°C/W, θJC = 3.5°C/W).
Technical Context
The AP1117TG-U integrates a precision 1.25V reference, error amplifier, current-limit circuitry, and thermal shutdown protection. Its internal power transistor and control loop enable fast transient response to load steps up to 1A with <±50mV deviation under typical conditions.
It operates in either fixed-output mode (3.3V) or adjustable mode using two external resistors to set VOUT = 1.25V × (1 + R1/R2). The ADJ pin functions as ground in fixed mode and as feedback node in adjustable mode - no internal resistor network is used in fixed variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A maximum continuous - supports logic rails, FPGA I/O banks, and peripheral ICs requiring stable 3.3V at high current. |
| Dropout Voltage | 1.4V max at 1A - enables regulation from 4.7V input to 3.3V output, critical for battery-backed or multi-rail systems with tight VIN margins. |
| Output Voltage Accuracy | ±1% at 10mA, 25°C - ensures reliable operation of 3.3V-tolerant interfaces (e.g., USB PHY, PCIe clock buffers) without margining overhead. |
| Ripple Rejection | 60–70dB at 180Hz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Shutdown | Activates at ~150°C junction temperature - protects against sustained overload or inadequate heatsinking in TO220-3L mounting. |
| Minimum Load Current | 5–10mA - mandates use of light bleed resistor or active load if downstream circuitry draws near-zero quiescent current. |
| Line Regulation | 0.2% - limits output drift across input range (4.8–12V), reducing need for post-regulation filtering in variable-input applications. |
Pinout & Package
AP1117TG-U uses TO220-3L package with exposed thermal tab electrically connected to VOUT. Mounting the tab to a heatsink or copper pour is required for full 1A operation at ambient >50°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj/GND) | Feedback reference / Ground return | In fixed 3.3V mode, internally tied to GND; in adjustable mode, connects to resistor divider midpoint - sets output via 1.25V reference. |
| 2 (VOUT) | Regulated output | Delivers 3.3V ±1%; requires ≥10µF capacitor (ESR 0.15–20Ω) for stability; tab is electrically connected to this pin. |
| 3 (VIN) | Unregulated input | Accepts 4.8–18V DC; must remain ≥1.3V above VOUT to sustain regulation; large bulk capacitor recommended to limit sag during transients. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout | 1.4V max at 1A enables efficient 3.3V generation from 5V or 12V rails where headroom is constrained. |
| Fast Transient Response | Load step recovery within microseconds (typ. <50µs) minimizes undershoot/overshoot on digital logic supplies during burst-mode operation. |
| Built-in Thermal Shutdown | Auto-recovery cycle prevents permanent damage during sustained overload or poor heatsinking in TO220-3L mounting. |
| Output Current Limiting | 1.1A typical current limit protects both regulator and downstream circuits during short-circuit or startup inrush. |
| No External Compensation Required | Internally compensated for stability with 10µF tantalum or ceramic output capacitor - simplifies layout and reduces BOM count. |
Applications
| VGA Graphics Card Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Providing clean 3.3V bias to analog front-end DACs and video timing controllers on discrete GPU PCBs. IC Role / Device Role / Timing Role: Primary local LDO for noise-sensitive analog circuitry adjacent to high-current digital GPUs. Use Value: 70dB ripple rejection suppresses switching noise from GPU core VRMs, preserving SNR in analog video paths. |
Use Scenario: Regulating 3.3V for isolated RS-485 transceivers and microcontroller peripherals in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Point-of-load regulator delivering fault-tolerant 3.3V to communication interface ICs operating in electrically noisy factory environments. Use Value: Thermal shutdown and current limiting ensure continued operation during field-wiring faults or ESD events on industrial bus lines. |
| Embedded Network Router | Medical Diagnostic Sensor Interface |
|
Use Scenario: Supplying 3.3V to Ethernet PHYs and packet buffer memory in compact SOHO routers with limited board space. IC Role / Device Role / Timing Role: Fixed-output LDO replacing switching regulators to eliminate EMI concerns near RF sections and high-speed data lanes. Use Value: Low-noise linear regulation avoids spectral interference with 2.4GHz/5GHz Wi-Fi bands while maintaining 1A capacity for bursty traffic loads. |
Use Scenario: Powering precision ADC front-ends and low-noise op-amps in portable ultrasound probe signal chains. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage source for analog signal conditioning stages requiring <0.5% output stability over temperature. Use Value: ±1% output accuracy and 0.5% temperature stability ensure consistent gain calibration across -20°C to +70°C clinical operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM1117MPX-3.3/NOPB | TO220-3 package; 1.2V dropout at 800mA; 1% initial accuracy; no green molding compound. | Lower thermal performance (θJA ≈ 90°C/W); not RoHS-compliant per EU Directive 2002/95/EC. | Prefer AP1117TG-U for RoHS compliance, lower dropout, and improved thermal resistance in TO220-3L. |
| MIC29302WU-3.3 | TO263-3 package; 0.6V dropout at 3A; integrated reverse-battery protection; higher quiescent current (40mA). | Over-specified current capability; larger footprint; unsuitable for space-constrained TO220 footprints. | Choose AP1117TG-U when board layout rework is impractical and 1A/3.3V/TO220-3L is mandatory. |
Compared with LM1117MPX-3.3/NOPB, AP1117TG-U offers tighter RoHS compliance, lower dropout, and better thermal metrics; versus MIC29302WU-3.3, it provides footprint compatibility and lower quiescent current at matched 1A rating.
Availability
AP1117TG-U is available at Aetrix Electronics and suitable for industrial PLC I/O modules, embedded network routers, and medical diagnostic sensor interfaces requiring stable component supply with lead-free, green-compliant packaging.
Supply support for AP1117TG-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Malaysia, and Taiwan.
The AP1117 product line targets cost-sensitive, high-volume applications requiring robust fixed or adjustable LDO regulation - especially PC peripherals, communications infrastructure, and industrial control systems where reliability and thermal resilience are critical.
FAQ
What is the minimum input voltage required for AP1117TG-U to regulate 3.3V output?
The AP1117TG-U requires VIN ≥ VOUT + 1.3V to maintain regulation, so minimum input is 4.6V. At full 1A load, dropout rises to 1.4V, making 4.7V the practical minimum for guaranteed performance across temperature and tolerance. Below this, output voltage sags proportionally to (VIN – VOUT).
Can AP1117TG-U be used in adjustable mode despite its 'TG-U' suffix indicating fixed 3.3V?
No. The 'TG-U' suffix denotes TO220-3L package (T), fixed 3.3V output (G), and tube packaging (-U). Internally, the ADJ pin is hardwired to GND; external resistor networks will not alter output voltage. Only AP1117xxx-ADJ variants support adjustable operation.
Is a heatsink mandatory for AP1117TG-U operating at 1A continuous current?
Yes. With θJA = 78°C/W and 1A load at 12V input (8.7W dissipation), junction temperature exceeds 150°C without heatsinking. A 10°C/W heatsink reduces θJA to ~25°C/W, enabling safe 1A operation up to 60°C ambient. PCB copper area alone is insufficient.
Does AP1117TG-U require an input capacitor, and if so, what value and type?
While not strictly mandatory for stability, a 10µF aluminum or tantalum input capacitor is strongly recommended to limit VIN sag during load transients and reduce conducted EMI. Ceramic capacitors ≥1µF may be added in parallel for high-frequency decoupling, but bulk capacitance remains essential for 1A step response.
AP1117TG-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:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 5V
- 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
AP1117TG-U FAQ
1.How can I place an order for AP1117TG-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1117TG-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 AP1117TG-U reliable?
The price and inventory of AP1117TG-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1117TG-U is usually 5 days.
3.What payment methods are accepted for AP1117TG-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1117TG-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1117TG-U?
AP1117TG-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1117TG-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 AP1117TG-U?
For technical support, including AP1117TG-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1117TG-U requirements.
6.How does Aetrix verify that AP1117TG-U is sourced from the original manufacturer or authorized distributors?
All AP1117TG-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 AP1117TG-U meets industry standards.
7.What is the process for return or replacement of AP1117TG-U?
All AP1117TG-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1117TG-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 AP1117TG-U part is unused and in its original packaging.
Return procedure for AP1117TG-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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