LM317LIDG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
LM317LIDG4 is an adjustable positive linear voltage regulator from Texas Instruments providing 1.2V to 32V output at up to 100mA in an 8-pin SOIC package. It features a wide 35V maximum input-output differential with 0.05%/V line regulation for precision low-current voltage references. Available in lead-free SOIC-8 tube packaging for industrial instrumentation and reference supply designs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- LM317LIDG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Adjustable output range from 1.2V to 32V set by two external resistors enables flexible single-output voltage regulation without fixed-voltage part proliferation
- 100mA maximum output current with 35V input-output differential supports low-power precision reference and bias supply designs
- 0.05%/V line regulation provides stable output across wide input voltage swings in unregulated transformer-based supplies
- 8-pin SOIC package facilitates easy PCB integration alongside other analog components in tight instrumentation board layouts
Applications
LM317LIDG4 is used in low-current precision voltage reference circuits, sensor bias supplies, and adjustable bench supply modules where output accuracy and simplicity are more important than efficiency. Its 1.2V to 32V adjustable range and 100mA current limit suit bias generation for op-amps, ADC reference inputs, and small relay coil drivers from a single positive rail. Industrial test equipment and legacy analog instrumentation designs also rely on the LM317 family for its proven long-term stability and predictable thermal behavior.
Specifications
| YTEOL | 0 |
| Adjustability | ADJUSTABLE |
| Dropout Voltage1-Nom | 5V |
| Input-Output Voltage Differential-Max | 35V |
| Input-Output Voltage Differential-Min | 5V |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Line Regulation-Max (%/V) | 0.05 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 0.1A |
| Output Voltage1-Max | 32V |
| Output Voltage1-Min | 1.2V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Regulator Type | ADJUSTABLE POSITIVE SINGLE OUTPUT STANDARD REGULATOR |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for LM317LIDG4:
Frequently Asked Questions
How do you set LM317LIDG4 to a 5V output using external resistors, and what resistor values are required?
To set LM317LIDG4 output to 5V, use a voltage divider from the output to ADJ pin: R1 of 240Ω from output to ADJ, and R2 of approximately 720Ω from ADJ to ground. This follows the formula VOUT = 1.25V × (1 + R2/R1), giving 5.0V with a 3:1 ratio. The 1.25V internal reference is stable to within 1%, so the output accuracy depends primarily on resistor tolerance — using 1% metal film resistors keeps output error within ±2% of the 5V target in a 25°C ambient environment.
For a 24V-to-5V bias supply drawing 80mA, how much power does LM317LIDG4 dissipate and does it need a heatsink?
At 80mA load with a 19V input-output differential (24V in, 5V out), LM317LIDG4 dissipates approximately 1.52W (19V × 80mA). The 8-pin SOIC package has a thermal resistance of roughly 80°C/W junction-to-ambient, resulting in a 122°C junction temperature rise above a 25°C ambient — approaching or exceeding the 125°C rating. A small copper pour heatsink pad or an external clip-on heatsink reducing junction-to-ambient to 50°C/W would bring junction temperature to 76°C above ambient, safely within the operating range without derating.
When is LM317LIDG4 preferable to a switching regulator for a precision 3.3V sensor reference supply?
LM317LIDG4 is preferable over a switching regulator when output noise below 100µV RMS is required, since linear regulators produce no switching harmonics at 100kHz to 10MHz that would contaminate sensitive ADC reference inputs or sensor signal chains. In a 12V-powered precision temperature measurement board drawing under 50mA at 3.3V, the 440mW LM317 dissipation is acceptable and its noise performance eliminates the need for LC post-filters that a switching regulator would require. The simpler two-resistor adjustment also reduces design and validation time compared to inductor selection and switching loop compensation.
How does LM317LIDG4's 35V maximum input-output differential constrain its use in a 48V telecom supply application?
The LM317LIDG4 is rated for a maximum 35V input-output differential, which means it cannot safely regulate from a 48V telecom bus down to 3.3V — the 44.7V differential would exceed the 35V absolute maximum rating and risk device failure. For 48V input applications, a pre-regulator stage such as a 15V zener clamp or a switching pre-converter must first reduce the input to below 35V above the target output (e.g., to 12V for a 5V output), after which LM317LIDG4 can handle the final regulation stage safely within its 7V differential in that case.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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