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Texas Instruments REG1117FA-5.0/500
- Part No.:
- REG1117FA-5.0/500
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
REG1117FA-5.0/500.pdf
- Description:
- IC REG LIN 5V 1A DDPAK/TO263-3
- Quantity:
- Payment:
- Shipping:
Inventory:733
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Product details
Overview
REG1117FA-5.0/500 from Texas Instruments is a 5V fixed-output, 1A low-dropout linear voltage regulator in DDPAK-3 (TO-263) package, featuring 1.3V max dropout at 1A, ±1% output tolerance, internal current limit, and thermal overload protection. It delivers stable core power to FPGA, PLD, and CPU subsystems in notebook PCs and battery-powered instrumentation.
For engineers reviewing the REG1117FA-5.0/500 datasheet, REG1117FA-5.0/500 pinout, REG1117FA-5.0/500 application, or REG1117FA-5.0/500 equivalent, key selection criteria include dropout voltage at full load, thermal resistance with PCB copper area, output tolerance over temperature, and compatibility with 10µF tantalum output capacitance.
Technical Context
The REG1117FA-5.0/500 uses an NPN pass transistor architecture enabling high efficiency and low dropout. Its laser-trimmed reference ensures ±1% initial output accuracy without external adjustment, and its internal thermal shutdown activates at ~165°C while rated for continuous operation up to +125°C junction temperature.
It requires no minimum load for regulation, supports input voltages up to +15V, and maintains stable output under line transients (±40mV deviation) and load transients (±0.1V deviation at 0.1A–1A step), with 62dB ripple rejection at 120Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V ±1% (guaranteed over 0–1A load and −40°C to +125°C) |
| Max Output Current | 1A continuous (internal current limit prevents damage during overload) |
| Dropout Voltage | 1.3V max at 1A (enables operation with only 6.3V input for 5V output) |
| Line Regulation | 3mV max (input 7V–15V, ensures stable output despite supply rail variation) |
| Load Regulation | 3mV max (0–1A load, critical for digital core supply stability) |
| Ripple Rejection | 62dB at 120Hz (suppresses AC components from unregulated DC inputs) |
| Thermal Resistance θJA | 65°C/W (no heatsink); drops to ~27°C/W with 4in² copper pad (dictates PCB thermal design) |
Pinout & Package
REG1117FA-5.0/500 is housed in a 3-lead DDPAK-3 (TO-263) surface-mount package with the mounting tab electrically connected to VOUT and thermally coupled to PCB copper for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 6.3V–15V input; must be decoupled with ≥1µF capacitor near pin |
| VOUT | Regulated 5V output | Tab is internally connected to VOUT; requires ≥10µF tantalum output capacitor for stability |
| GND | Ground reference | Low-impedance return path; layout must minimize trace inductance to prevent instability |
Key Features
| Feature | Design Value |
|---|---|
| NPN pass transistor | Enables lower dropout than PNP-based regulators and contributes output-stage drive current for higher efficiency |
| Laser-trimmed reference | Delivers ±1% initial output accuracy without external calibration or trimming components |
| Integrated thermal shutdown | Activates at ~165°C junction temperature to prevent permanent damage during sustained overload |
| Internal current limiting | Clamps output current to ~1.25A typical, protecting both IC and upstream supply during short-circuit events |
| No minimum load requirement | Stabilizes output down to zero load-critical for low-power sleep modes in portable systems |
Applications
| SCSI-2 Active Termination | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Provides precise 2.85V termination voltage across up to 27 SCSI signal lines in server backplanes. IC Role / Device Role / Timing Role: Fixed-voltage regulator supplying bias current to parallel termination networks. Use Value: Enables compliant SCSI-2 active termination using single REG1117FA-5.0/500-derived 2.85V via resistor divider (Fig. 7), eliminating need for dedicated termination ICs. | Use Scenario: Powers microcontroller, ADC, and sensor front-end in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Primary 5V LDO delivering clean, low-noise supply to mixed-signal circuits. Use Value: 62dB ripple rejection and <0.003% RMS output noise ensure accurate analog measurements without added filtering. |
| Core Voltage Supply for FPGA/PLD | Notebook PC Battery Management |
Use Scenario: Supplies configurable I/O bank voltage (e.g., 3.3V or 5V) to FPGA/PLD devices in embedded control modules. IC Role / Device Role / Timing Role: Low-dropout regulator maintaining stable rail during dynamic current bursts from logic switching. Use Value: 1.3V dropout at 1A allows use with marginal battery or adapter voltages, extending operational time before brownout. | Use Scenario: Regulates 5V system rail from variable Li-ion battery pack (3.0–4.2V/cell) combined with boost converter output. IC Role / Device Role / Timing Role: Post-regulator ensuring tight 5V tolerance despite input ripple and transient load steps. Use Value: Load regulation of 3mV over 0–1A and thermal shutdown protect against overcurrent faults during battery charging cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2940CT-5.0/NOPB | 800mA max output, 0.5V higher dropout (1.8V @ 500mA), wider input range (up to 26V) | Suitable for higher-input industrial supplies but cannot sustain 1A at low VIN | Select when input exceeds 15V or thermal budget permits higher dropout |
| TLV1117-50CDCYR | 800mA max, SOT-223 package, 1.2V dropout @ 800mA, lower quiescent current (4mA vs 10mA) | Better suited for space-constrained PCBs where 1A load is not required | Select for cost-sensitive, lower-current designs with limited board area |
Compared with LM2940CT-5.0/NOPB and TLV1117-50CDCYR, the REG1117FA-5.0/500 uniquely supports 1A continuous output in DDPAK with 1.3V dropout-making it optimal for thermally demanding, high-current 5V core rails where SOT-223 thermal limits or lower-current alternatives fall short.
Availability
REG1117FA-5.0/500 is available at Aetrix Electronics and suitable for SCSI-2 termination, FPGA core power, and notebook PC battery management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for REG1117FA-5.0/500 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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision linear regulators and industrial-grade ICs.
The REG1117 family was designed specifically for high-reliability, low-noise linear regulation in computing, storage, and portable instrumentation-emphasizing dropout performance, thermal robustness, and ±1% output accuracy without external components.
FAQ
What is the maximum input voltage rating for REG1117FA-5.0/500?
The absolute maximum input voltage for REG1117FA-5.0/500 is +15V, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable 5V output, the recommended input range is 6.3V to 10V to maintain margin below the 1.3V dropout limit at full 1A load.
Does REG1117FA-5.0/500 require an external output capacitor, and what type is recommended?
Yes, REG1117FA-5.0/500 requires an output capacitor for stability and high-frequency load regulation. A 10µF tantalum capacitor is explicitly recommended in the datasheet; aluminum electrolytic capacitors of 50µF or greater are acceptable alternatives if ESR remains below 0.5Ω. Ceramic capacitors are not recommended due to potential instability.
Can REG1117FA-5.0/500 be used in parallel to increase current capability?
No, REG1117FA-5.0/500 is not designed for parallel operation. Its output voltage tolerance (±1%) and lack of current-sharing circuitry make paralleling unreliable and potentially unstable. For >1A requirements, select a higher-current regulator or redesign the power architecture-do not parallel multiple REG1117FA-5.0/500 units.
What is the thermal resistance (θJA) of REG1117FA-5.0/500 under standard PCB conditions?
The datasheet specifies θJA = 65°C/W for REG1117FA-5.0/500 with no heatsink. With a 4in² (≈25.8cm²) 1oz copper mounting pad, θJA improves to ~27°C/W. Actual value depends on PCB copper area, layer count, and airflow-designers must calculate junction temperature using TJ = TA + PD × θJA to ensure ≤125°C operation.
Is REG1117FA-5.0/500 RoHS-compliant and lead-free?
Yes, REG1117FA-5.0/500 is RoHS-compliant and lead-free, as confirmed in the Package Option Addendum: "Green (RoHS & no Sb/Br)" eco plan with "NIPDAU" (nickel-palladium-gold) lead finish. It meets JEDEC MSL Level-2-260°C-1 year moisture sensitivity classification for surface-mount assembly.
REG1117FA-5.0/500 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):
- 5V
- 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-5.0/500 FAQ
1.How can I place an order for REG1117FA-5.0/500 through Aetrix?
Please submit a Request for Quotation (RFQ) for REG1117FA-5.0/500 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-5.0/500 reliable?
The price and inventory of REG1117FA-5.0/500 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REG1117FA-5.0/500 is usually 5 days.
3.What payment methods are accepted for REG1117FA-5.0/500?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REG1117FA-5.0/500 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REG1117FA-5.0/500?
REG1117FA-5.0/500 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REG1117FA-5.0/500 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-5.0/500?
For technical support, including REG1117FA-5.0/500 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REG1117FA-5.0/500 requirements.
6.How does Aetrix verify that REG1117FA-5.0/500 is sourced from the original manufacturer or authorized distributors?
All REG1117FA-5.0/500 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-5.0/500 meets industry standards.
7.What is the process for return or replacement of REG1117FA-5.0/500?
All REG1117FA-5.0/500 units undergo pre-shipment inspection (PSI). If there is an issue with REG1117FA-5.0/500, 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-5.0/500 part is unused and in its original packaging.
Return procedure for REG1117FA-5.0/500:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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