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STMicroelectronics LM317LD13TR
- Part No.:
- LM317LD13TR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM317LD13TR.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:69,456
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Product details
Overview
LM317LD13TR from STMicroelectronics is a monolithic adjustable positive voltage regulator in SO-8 package, delivering up to 100 mA output current with 1.2 V to 37 V adjustable output range, ±0.7% output voltage temperature stability, and built-in thermal overload and short-circuit protection. It operates as a floating regulator for high-voltage applications such as lab power supplies and industrial sensor biasing.
For engineers reviewing the LM317LD13TR datasheet, LM317LD13TR pinout, LM317LD13TR application, or LM317LD13TR equivalent, key selection criteria include its 1.25 V internal reference voltage, 100 µA max adjustment pin current, 0.01% typical line regulation, and SO-8 thermal performance with RthJA = 55 °C/W (with 6 cm² copper heatsink).
Technical Context
The LM317LD13TR implements a bandgap-referenced error amplifier driving a pass transistor, with all quiescent current returned to the output to maintain regulation under light loads. Its floating architecture allows operation with input-to-output differentials up to 40 V, enabling use in high-side configurations without ground-referenced constraints.
Internal safe-area compensation prevents secondary breakdown during transient overloads, while the 1.25 V reference is trimmed at wafer level for ±1% initial accuracy. Output voltage is set via external resistive divider (R1–R2), where VO = 1.25 V × (1 + R2/R1) + IADJ × R2 - with IADJ ≤ 100 µA ensuring minimal error contribution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage range | 1.2 V to 37 V - set by external resistor divider; enables single BOM part across multiple supply rails. |
| Max output current | 100 mA at VI–VO ≤ 13 V - sufficient for low-power analog circuitry, sensor excitation, and biasing. |
| Reference voltage | 1.25 V (min 1.2 V, max 1.3 V) - stable bandgap reference used directly in feedback loop for precision adjustment. |
| Line regulation | 0.01% / V typ - ensures <±0.37 mV/V output change over input variation; critical for stable sensing front-ends. |
| Load regulation | 5 mV typ (VO ≤ 5 V, IO = 5–100 mA) - maintains tight output control despite load transients in instrumentation circuits. |
| Adjust pin current | 50–100 µA - low and stable, minimizing R2-induced error in voltage-setting network. |
| Thermal resistance | RthJA = 55 °C/W (SO-8, 6 cm² copper) - defines maximum power dissipation (≈1.1 W) before thermal shutdown. |
Pinout & Package
LM317LD13TR uses an SO-8 surface-mount package with exposed die attach flag connected internally to pins 2, 3, 6, and 7 for enhanced thermal conduction. The package conforms to ECOPACK® environmental compliance standards and requires a recommended footprint per ST's DocID2168 Rev 7.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ADJ) | Adjust terminal | Feedback node for voltage divider; referenced to output; carries ≤100 µA for stable regulation. |
| 2 (IN) | Input terminal | Unregulated DC input; must remain ≥1.25 V above output to sustain regulation (dropout ≈1.25 V). |
| 3 (OUT) | Output terminal | Regulated output; supplies load current and returns all quiescent current to maintain minimum load condition. |
| 4 (NC) | No connect | Internally unconnected; must be left floating or tied to GND per layout best practice. |
| 5 (NC) | No connect | Internally unconnected; no electrical function; avoid routing signals here. |
| 6 (GND) | Ground reference | Die attach flag connection; electrically tied to pins 2/3/7; serves as thermal and electrical ground path. |
| 7 (GND) | Ground reference | Redundant ground pin for low-impedance return; improves thermal dissipation when soldered to copper plane. |
| 8 (NC) | No connect | Internally unconnected; no functional role; do not tie to any net. |
Key Features
| Feature | Design Value |
|---|---|
| Floating regulator architecture | Supports high-side regulation with VI–VO ≤ 40 V differential; enables >37 V input supplies without level-shifting. |
| Internal thermal overload protection | Automatically limits junction temperature to ≤125 °C; prevents permanent damage during sustained overload or poor heatsinking. |
| Short-circuit current limiting | Clamps output current to ~100 mA during fault; protects both IC and downstream circuitry without external components. |
| Output transition safe-area compensation | Prevents secondary breakdown of pass transistor during rapid load or line transients; eliminates need for external SOA protection. |
| Low adjustment pin current drift | IADJ variation ≤5 µA over full line/load range; ensures predictable R2-based voltage setting across operating conditions. |
Applications
| Lab Bench Power Supply | Industrial Sensor Biasing |
|---|---|
|
Use Scenario: Adjustable benchtop supply for prototyping analog circuits requiring precise, low-noise DC rails between 1.5 V and 30 V. IC Role / Device Role / Timing Role: Primary voltage regulation element; configured with potentiometer and fixed resistors for manual output tuning. Use Value: Eliminates need for multiple fixed regulators; 0.003% output noise and 65 dB SVR ensure clean power for op-amp and ADC reference stages. |
Use Scenario: Providing stable excitation voltage to RTDs, strain gauges, and bridge sensors in factory-floor measurement systems. IC Role / Device Role / Timing Role: Precision bias source; output set to 2.5 V or 5 V using 0.1% metal-film resistors for ratiometric accuracy. Use Value: ±0.7% temperature stability and 5 mV load regulation prevent measurement drift across 0–70 °C ambient range. |
| Programmable Current Source | Remote Voltage Reference Generator |
|
Use Scenario: Constant-current driver for LED test fixtures and calibration sources requiring 10–100 mA with <1% accuracy. IC Role / Device Role / Timing Role: Current regulator; R1 placed between ADJ and OUT, with load between OUT and GND. Use Value: 1.25 V reference and 100 µA IADJ enable 1% current accuracy using single 12.5 Ω resistor (IOUT = 1.25 V / R1). |
Use Scenario: Generating isolated, low-drift reference voltages for data acquisition modules in PLC backplanes. IC Role / Device Role / Timing Role: Floating reference generator; powered from 24 V bus, output referenced to local signal ground. Use Value: SO-8 thermal design supports continuous 1.25 V @ 100 mA output with <10 mV ripple, suitable for 16-bit SAR ADC references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317LZ | TO-92 package; RthJA = 200 °C/W; max output current derated to 50 mA at TA = 70 °C. | Suitable for low-power, through-hole designs with limited board space; not recommended for >60 mA continuous loads. | Select when manual assembly, cost sensitivity, or legacy TO-92 footprint is required; verify thermal margin with worst-case power dissipation. |
| TLV1117-ADJ | Lower dropout (1.2 V), higher PSRR (70 dB), but only 800 mA max output; SO-8 package with different pinout (IN/OUT/GND). | Better suited for low-input-voltage systems (e.g., 3.3 V–5 V rails); incompatible pin-for-pin replacement due to reversed IN/OUT placement. | Choose for battery-powered or low-VIN applications where dropout and PSRR outweigh adjustable range; redesign PCB layout required. |
Compared with LM317LZ and TLV1117-ADJ, LM317LD13TR uniquely balances wide 1.2–37 V adjustability, SO-8 thermal performance, and proven robustness in industrial environments - making it optimal for medium-current, high-differential-voltage applications where reliability trumps ultra-low dropout.
Availability
LM317LD13TR is available at Aetrix Electronics and suitable for lab power supplies, industrial sensor biasing, programmable current sources, and remote voltage reference generators requiring stable component supply across extended product lifecycles.
Supply support for LM317LD13TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, analog chips, and MEMS sensors for industrial, automotive, and consumer markets.
LM317LD13TR belongs to ST's legacy linear regulator product line, engineered for ruggedness, thermal resilience, and ease of use in industrial power conditioning - emphasizing long-term reliability over feature density.
FAQ
What is the minimum load current required for stable regulation with LM317LD13TR?
The LM317LD13TR requires a minimum load current of 3.5 mA (typical) to 5 mA (max) when VI–VO = 40 V. This is due to its architecture returning all quiescent current to the output; insufficient load causes output voltage to rise uncontrollably. A 240 Ω resistor from OUT to GND ensures compliance across all operating conditions.
Can LM317LD13TR be used in a current-limiting configuration?
Yes - configure it as a precision current regulator by connecting a resistor (R1) between ADJ and OUT terminals, with the load between OUT and GND. Output current equals 1.25 V / R1, accurate to within ±1% given IADJ ≤ 100 µA and reference tolerance. No additional components are needed.
Does LM317LD13TR require input/output capacitors for stability?
Input capacitance (≥0.1 µF ceramic) is recommended to suppress high-frequency noise; output capacitance (≥1 µF tantalum or 10 µF aluminum) improves transient response and prevents oscillation. A 10 µF capacitor from ADJ to GND enhances ripple rejection by 15 dB but is optional for basic regulation.
How does the SO-8 package of LM317LD13TR improve thermal performance over TO-92 versions?
The SO-8 package features internal connection of pins 2, 3, 6, and 7 to the die attach flag, reducing RthJA to 55 °C/W (vs. 200 °C/W for TO-92) when mounted on 6 cm² copper. This allows 1.1 W continuous dissipation - more than double the TO-92 limit - enabling higher current or wider input-output differentials without heatsinks.
LM317LD13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 5 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 65dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM317LD13TR FAQ
1.How can I place an order for LM317LD13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM317LD13TR 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 LM317LD13TR reliable?
The price and inventory of LM317LD13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM317LD13TR is usually 5 days.
3.What payment methods are accepted for LM317LD13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM317LD13TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM317LD13TR?
LM317LD13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM317LD13TR 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 LM317LD13TR?
For technical support, including LM317LD13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM317LD13TR requirements.
6.How does Aetrix verify that LM317LD13TR is sourced from the original manufacturer or authorized distributors?
All LM317LD13TR 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 LM317LD13TR meets industry standards.
7.What is the process for return or replacement of LM317LD13TR?
All LM317LD13TR units undergo pre-shipment inspection (PSI). If there is an issue with LM317LD13TR, 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 LM317LD13TR part is unused and in its original packaging.
Return procedure for LM317LD13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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