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Texas Instruments REG1117FA-1.8KTTT
- Part No.:
- REG1117FA-1.8KTTT
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
REG1117FA-1.8KTTT.pdf
- Description:
- IC REG LIN 1.8V 1A DDPAK/TO263-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,182
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Product details
Overview
REG1117FA-1.8KTTT from Texas Instruments is a 1.8V fixed-output, 1A low-dropout linear voltage regulator in DDPAK/TO-263 package. It delivers ±1% output voltage accuracy over load (0–1A) and temperature (−40°C to +125°C), with 1.3V max dropout at full load, internal current limiting, and thermal overload protection. It powers FPGA core supplies and battery management circuits in notebook PCs.
For engineers reviewing the REG1117FA-1.8KTTT datasheet, REG1117FA-1.8KTTT pinout, REG1117FA-1.8KTTT application, or REG1117FA-1.8KTTT equivalent, key selection factors include guaranteed 1A output current, 1.8V fixed output with laser-trimmed 1% tolerance, DDPAK thermal performance (θJA = 65°C/W unheatsinked), and integrated thermal shutdown at ~165°C junction temperature.
Technical Context
The REG1117FA-1.8KTTT uses an NPN pass transistor architecture enabling high efficiency by allowing output-stage drive to contribute to load current. Its internal reference voltage is 1.25V with ±0.0125V initial tolerance, trimmed via laser for precision.
It features dual protection: foldback current limiting (1000–1600mA typical) and thermal shutdown activated at approximately 165°C. The device operates across −40°C to +125°C junction temperature range and supports input voltages up to +15V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8V ±1% (1.764V to 1.836V over 0–1A load and −40°C to +125°C) |
| Output Current | 1A maximum continuous (REG1117FA series rating) |
| Dropout Voltage | 1.3V max at 1A load (enables operation with VIN as low as 3.1V for stable 1.8V output) |
| Line Regulation | 1mV typical (0.001V change per input variation; critical for stable supply under varying input) |
| Load Regulation | 2mV typical (0.002V change from no-load to full 1A; ensures tight voltage control across load range) |
| Quiescent Current | 4–10mA (low bias current preserves battery life in portable applications) |
| Thermal Resistance θJA | 65°C/W (no heatsink); improves to ~27°C/W with 4in² copper pad (guides PCB thermal design) |
Pinout & Package
REG1117FA-1.8KTTT uses a 3-pin DDPAK/TO-263 surface-mount package with exposed thermal tab electrically connected to VOUT. The tab must be soldered to a large copper area for effective heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 3.8V to 15V DC input; minimum required headroom is 1.3V above VOUT for regulation |
| VOUT | Regulated output | 1.8V fixed output; tab is internally tied to this node-must connect to system 1.8V plane and thermal ground |
| GND | Ground reference | Analog and power return; requires low-impedance connection to minimize noise and improve regulation |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed output accuracy | ±1% over full load/temperature range eliminates need for external calibration or trimming resistors |
| NPN pass transistor | Enables output-stage drive contribution to load current, improving conversion efficiency vs. PNP-based LDOs |
| Integrated thermal shutdown | Activates at ~165°C junction temperature, protecting against sustained overload without external circuitry |
| Internal current limit | 1000–1600mA foldback protection prevents damage during short-circuit or overcurrent events |
| Low ESR capacitor compatibility | Stable with 10µF tantalum or ≥50µF aluminum electrolytic (ESR < 0.5Ω), simplifying output filter design |
Applications
| SCSI-2 Active Termination | Hand-Held Data Collection Devices |
|---|---|
Use Scenario: Providing precise 2.85V termination voltage for SCSI-2 bus lines in server backplanes. IC Role / Device Role / Timing Role: Fixed-voltage regulator supplying stable termination bias; used in parallel across multiple lines. Use Value: REG1117FA-1.8KTTT variant not used here; 2.85V models (e.g., REG1117-2.85) are specified for this application per datasheet. | Use Scenario: Powering microcontroller, display, and sensor subsystems in portable barcode scanners. IC Role / Device Role / Timing Role: Primary 1.8V core supply for low-power MCU and memory interfaces. Use Value: 1A capability supports burst-mode operation; 1.3V dropout enables use of single-cell Li-ion (3.0–4.2V) without intermediate buck stage. |
| Core Voltage Supply: FPGA, PLD, DSP, CPU | Battery Management Circuits for Notebook PCs |
Use Scenario: Delivering clean, tightly regulated 1.8V to FPGA I/O banks or processor cores requiring low-noise supply. IC Role / Device Role / Timing Role: Point-of-load (POL) regulator directly adjacent to IC power pins. Use Value: 1% output tolerance and 2mV load regulation ensure logic-level compliance; 0.003% RMS noise minimizes timing jitter. | Use Scenario: Generating 1.8V bias for fuel gauge ICs, battery protection MOSFET drivers, and charging controller logic. IC Role / Device Role / Timing Role: Secondary regulated rail derived from main battery or system 3.3V/5V bus. Use Value: Thermal shutdown and current limit protect against fault conditions during battery cell imbalance or shorted sense lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1117-18CDCYR | 1A, 1.8V, SOT-223 package; higher quiescent current (5–10mA vs. 4–10mA); same 1% tolerance | Suitable for space-constrained layouts where DDPAK thermal mass is unnecessary | Select when board area is limited and thermal load ≤1W; verify θJA meets ambient requirements |
| LP38691SD-1.8/NOPB | 1A, 1.8V, 3-pin TO-263; lower dropout (0.6V typ. at 1A); higher PSRR (60dB @120Hz) | Better suited for noisy input environments (e.g., switching supply rails) and ultra-low-headroom designs | Select when input voltage may dip below 3.0V or ripple rejection >62dB is required |
Compared with TLV1117-18CDCYR and LP38691SD-1.8/NOPB, REG1117FA-1.8KTTT offers superior thermal resistance in DDPAK (2°C/W θJC) for high-power-density designs, while maintaining identical 1.8V/1A functionality and TI's long-term product availability commitment.
Availability
REG1117FA-1.8KTTT is available at Aetrix Electronics and suitable for FPGA core supplies, battery management circuits, and hand-held instrumentation requiring stable component supply and long-lifecycle support.
Supply support for REG1117FA-1.8KTTT 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The REG1117 family was designed as a cost-effective, easy-to-use three-terminal LDO regulator for applications demanding high accuracy, low dropout, and robust protection-especially in portable and thermally constrained systems.
FAQ
What is the maximum input voltage for REG1117FA-1.8KTTT?
The absolute maximum input voltage for REG1117FA-1.8KTTT is +15V DC, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable 1.8V regulation, input must remain ≥3.1V (1.8V + 1.3V dropout) across all load and temperature conditions. TI recommends derating for long-term reliability and thermal margin.
Does REG1117FA-1.8KTTT require an output capacitor, and what type is recommended?
Yes, REG1117FA-1.8KTTT requires an output capacitor for stability and high-frequency load regulation. A 10µF tantalum capacitor is recommended, with ESR < 0.5Ω. Aluminum electrolytic capacitors ≥50µF are also acceptable. Ceramic capacitors are not recommended unless explicitly validated, as low-ESR types may cause instability due to the regulator's internal compensation.
What is the thermal shutdown threshold of REG1117FA-1.8KTTT?
REG1117FA-1.8KTTT activates thermal shutdown at approximately 165°C junction temperature. This protects the device during sustained overload but is not intended for continuous cycling. For reliable operation, the junction temperature must stay ≤125°C-requiring appropriate PCB copper area (e.g., 4in² for θJA ≈27°C/W) and ambient derating per the power dissipation equation PD = (VIN – 1.8V) × IOUT.
Can REG1117FA-1.8KTTT be used in adjustable-voltage configurations?
No, REG1117FA-1.8KTTT is a fixed-output 1.8V device and does not include an ADJ pin. Only the "REG1117" and "REG1117A" variants with suffix "-ADJ" or no suffix support adjustable output via external resistors. Attempting to modify REG1117FA-1.8KTTT for adjustability will not function and may damage the part.
Is REG1117FA-1.8KTTT RoHS compliant and lead-free?
Yes, REG1117FA-1.8KTTT is RoHS compliant and lead-free, meeting EU RoHS requirements for all 10 restricted substances. It carries the "Green (RoHS & no Sb/Br)" eco plan designation and uses NiPdAu (NIPDAU) lead finish. Moisture sensitivity level is MSL-2, with peak reflow temperature of 260°C per JEDEC J-STD-020.
REG1117FA-1.8KTTT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.55V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 62dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-3)
REG1117FA-1.8KTTT FAQ
1.How can I place an order for REG1117FA-1.8KTTT through Aetrix?
Please submit a Request for Quotation (RFQ) for REG1117FA-1.8KTTT 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 REG1117FA-1.8KTTT reliable?
The price and inventory of REG1117FA-1.8KTTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REG1117FA-1.8KTTT is usually 5 days.
3.What payment methods are accepted for REG1117FA-1.8KTTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REG1117FA-1.8KTTT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REG1117FA-1.8KTTT?
REG1117FA-1.8KTTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REG1117FA-1.8KTTT 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 REG1117FA-1.8KTTT?
For technical support, including REG1117FA-1.8KTTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REG1117FA-1.8KTTT requirements.
6.How does Aetrix verify that REG1117FA-1.8KTTT is sourced from the original manufacturer or authorized distributors?
All REG1117FA-1.8KTTT 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 REG1117FA-1.8KTTT meets industry standards.
7.What is the process for return or replacement of REG1117FA-1.8KTTT?
All REG1117FA-1.8KTTT units undergo pre-shipment inspection (PSI). If there is an issue with REG1117FA-1.8KTTT, 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 REG1117FA-1.8KTTT part is unused and in its original packaging.
Return procedure for REG1117FA-1.8KTTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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