BETALegacy reference1.25 V typical · RFB 1.256 V
100 mA adjustable linear regulator
LM317L Specifications
Review LM317L electrical specifications, operating conditions and package details.
Package view
Key specifications
OUTPUT follows ADJUST plus the internal reference. The feedback divider sets output voltage and provides a defined minimum load.
Output class100 mA · differential and thermal limits
Package options3 / 8 physical leads · TO-92 / SOIC
Junction maximum125 °C recommended; lower bound depends on chip
Package details
LM317LCLP · TO-92
| Property | Details |
|---|---|
| Manufacturer | Texas Instruments |
| Part number | LM317LCLP |
| Package | TO-92 |
| Connections | 3 pins |
| Mounting | Through-hole |
| Lead pitch | 1.27 mm · straight leads |
| Package code | LP |
| Thermal reference | Legacy chip only; θJA 139.5 or 156.7°C/W under TI conditions |
Package and chip identity
TI SLCS144G distinctions
Manufacturer specifications 5 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| TO-92 | LM317LCLP · LP0003A | Legacy SHE or TID chip; no new RFB die |
| SOIC-8 | LM317LCDR · D0008A | Legacy SHE/TID or new RFB; verify ordered device |
| TO-92 physical pins | 1 INPUT; 2 OUTPUT; 3 ADJUST | Front view left-to-right: 3,2,1 |
| SOIC physical pins | IN1; OUT2,3,6,7; ADJ4; NC5,8 | All four OUTPUT terminals are internally connected |
| Chip origin | CSO: SHE / TID / RFB | Check manufacturer traceability; package alone is insufficient |
No specifications match. Try a parameter name or a unit.
Package-specific pin maps are explicit. Do not assume another manufacturer uses the same lead order.
Recommended ranges and absolute limits
SHE / TID / RFB are distinct chip variants
Manufacturer specifications 7 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Output voltage | SHE 1.25–32 V; TID/RFB 1.25–37 V | With adequate headroom and load |
| Recommended differential | SHE 2.5–32 V; TID/RFB 2.5–37 V | VI−VO |
| Absolute differential | SHE 35 V; TID 40 V; RFB 45 V | Stress limits, not operating targets |
| Recommended output current | 2.5–100 mA | Minimum-load row may require 5 mA for legacy TID |
| LM317LC junction | SHE 0–125°C; TID/RFB −40–125°C | Verify chip origin |
| LM317LI junction | −40–125°C | Industrial grade |
| Absolute junction maximum | 150°C | Recommended operating maximum remains 125°C |
No specifications match. Try a parameter name or a unit.
Never apply the RFB 45 V stress rating to unverified legacy stock.
Reference and adjustment current
VI−VO 5–35 V; IO 2.5–100 mA; rated dissipation
Manufacturer specifications 6 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Legacy VREF min / typ / max | 1.20 / 1.25 / 1.30 V | SHE and TID |
| RFB VREF min / typ / max | 1.220 / 1.256 / 1.292 V | New chip |
| Legacy IADJ | 50 µA typical; 100 µA max. | Flows out of ADJUST |
| RFB IADJ | 44 µA typical; 57 µA max. | New chip |
| Legacy ΔIADJ | 0.2 µA typical; 5 µA max. | 2.5–35 V differential |
| RFB ΔIADJ | 0.8 µA typical; 2.5 µA max. | 2.8–35 V differential |
No specifications match. Try a parameter name or a unit.
Typical values are illustrative; reference and resistor tolerances affect the actual rail.
Regulation and ripple
Manufacturer test conditions retained
Manufacturer specifications 8 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Legacy line regulation at 25°C | 0.01 typical / 0.02 max. %/V | 5–35 V differential |
| RFB line regulation at 25°C | 0.007 typical / 0.021 max. %/V | 5–35 V differential |
| Legacy line regulation over specified range | 0.02 typical / 0.05 max. %/V | IO 2.5–100 mA |
| RFB line regulation over specified range | 0.006 typical / 0.0275 max. %/V | IO 2.5–100 mA |
| Legacy load regulation, VO≤5 V | 25 mV at 25°C; 50 mV over range | Maximum; IO 2.5–100 mA; 5–35 V differential |
| RFB load regulation, VO≤5 V | 25 mV maximum | At 25°C and over range; same test conditions |
| Ripple with 10 µF CADJ | Legacy 66 min / 80 typ dB; RFB 64 min / 71.5 typ dB | VO10 V; 120 Hz |
| Noise | 10 µV/V typical | 10 Hz–10 kHz; 25°C |
No specifications match. Try a parameter name or a unit.
Avoid mixing new-chip headline numbers with the legacy package specification.
Minimum load and peak current
Guaranteed regulation requires the applicable load
Manufacturer specifications 7 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Minimum load at 35 V differential | SHE 1.5 typ / 2.5 max. mA | Legacy chip |
| Minimum load at 35 V differential | TID 3.5 typ / 5 max. mA | Legacy chip |
| Minimum load at 35 V differential | RFB 1.28 typ / 1.72 max. mA | Recommended operating floor is still 2.5 mA |
| Legacy SHE peak current | 100 mA minimum; 200 mA typical | Differential ≤35 V |
| Legacy TID peak current | 100 min / 200 typ mA at 3–13 V | At 35 V: 25 min / 50 typ / 150 max. mA |
| New RFB peak current | 160 min / 290 typ mA | Differential ≤35 V; not a 290 mA continuous rating |
| Example divider minimum | 1.20 / 222.2 ≈5.40 mA | 220 Ω at +1%; covers 5 mA legacy requirement |
No specifications match. Try a parameter name or a unit.
Thermal limits apply in addition to current limiting.
Thermal and capacitor guidance
Board-dependent thermal figures
Manufacturer specifications 6 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| TO-92 θJA | 139.5 SHE / 156.7 TID °C/W | Manufacturer reference conditions |
| SOIC θJA | 97.1 SHE / 96.5 TID / 98.18 RFB °C/W | Actual PCB and airflow change the result |
| Local input bypass | 0.1 µF | Especially with long supply wiring |
| Output capacitor | 1 µF optional for transient response | No output capacitor required for stability per TI |
| Adjustment bypass | Optional 10 µF | Review protection diodes when adding stored charge |
| Example pass loss | ≈62.7 mW | (9−5) × (5/500+1.25/220) |
No specifications match. Try a parameter name or a unit.
Protection is not a substitute for correct operating voltage, minimum load or thermal design.
Near-5 V calculated example
220 Ω / 660 Ω · 500 Ω load
Manufacturer specifications 7 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Input / bypass | 9 V / 0.1 µF | Common ground return |
| Ideal legacy output | 1.25 × (1+660/220) = 5.00 V | Before adjustment current |
| Legacy typical corrected output | 5.033 V | Adds 50 µA × 660 Ω |
| New RFB typical corrected output | 5.05304 V | 1.256 ×4 +44 µA ×660 |
| Load / divider current | 10 mA / 5.682 mA | Nominal 5 V legacy calculation |
| Resistor power | 50 mW in 500 Ω load | Use 0.25 W or higher appropriately rated resistors |
| Output capacitor | 1 µF, suitably rated | Follow manufacturer bypass/protection guidance |
No specifications match. Try a parameter name or a unit.
Calculated illustration, not a measured or time-domain simulation.
Connections by function
Select a pin for its function, connection guidance and electrical notes.