LM317LD13TR - 1.2-37V Adjustable LDO | STMicroelectronics
MPN: LM317LD13TR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.0571 | $0.06 |
| 10 | $0.0571 | $0.57 |
| 100 | $0.0571 | $5.71 |
| 500 | $0.0571 | $28.55 |
| 1,000 | $0.0571 | $57.10 |
LM317LD13TR Overview
Drop-in alternatives for LM317LD13TR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LM317LD13TR (same form factor and footprint) — differing in Manufacturer, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM217LD
✅ Drop-In📋 Reference alternative (not in catalog)
LM317LD13TR
✅ Drop-In✓ In Stock
$0.0571 / Unit
View Datasheet →LM317LBDR2G
✅ Drop-In📋 Reference alternative (not in catalog)
LM317KCSE3
✅ Drop-In📋 Reference alternative (not in catalog)
LM2904BIDR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.13 / Unit
View Datasheet →LM317LD13TR Maximum Ratings & Electrical Characteristics
| Regulator Type | Adjustable linear voltage regulator |
| Output Polarity | Positive |
| Output Voltage Range | 1.2 V to 37 V |
| Input Voltage Range | 5 V to 40 V |
| Output Current | 100 mA |
| Output Voltage Type | Adjustable / Variable |
| Line Regulation | 0.01% typical |
| Load Regulation | 0.1% typical |
| Protection | Thermal overload and short-circuit protection |
| Package | 8-SOIC / SO-8 |
| Mounting Type | Surface Mount |
| Lifecycle Status | Active |
| Output Configuration | Single output |
| Manufacturer | STMicroelectronics |
| Datasheet Description | Low current 1.2 to 37 V adjustable voltage regulator |
| Distributor Stock Example | 1,490 units in stock at LCSC |
| Verified Distributor Unit Price Example | From $0.0571 at LCSC |
| RoHS Status | Unknown; not stated in verified data |
| REACH Status | Unknown; not stated in verified data |
| AEC-Q100 Status | Not stated in verified data |
LM317LD13TR Pin Configuration
| Pin 1 | ADJ — Adjustment input |
| Pin 2 | OUT — Regulated output |
| Pin 3 | IN — Input supply |
| Pin 4 | NC — Not connected (per package convention; verify with manufacturer datasheet) |
| Pin 5 | NC — Not connected (per package convention; verify with manufacturer datasheet) |
| Pin 6 | NC — Not connected (per package convention; verify with manufacturer datasheet) |
| Pin 7 | NC — Not connected (per package convention; verify with manufacturer datasheet) |
| Pin 8 | NC — Not connected (per package convention; verify with manufacturer datasheet) |
Typical Applications
LM317LD13TR is suitable for 6 applications: Low-noise analog supply, Sensor excitation and reference circuits, Laboratory and educational power supply, Embedded control and instrumentation, Precision measurement front ends, Small industrial control boards.
Low-noise analog supply
The LM317LD13TR is suitable for powering small analog signal-conditioning circuits where low switching ripple and simple adjustment are more important than maximum conversion efficiency. Its 1.2 V to 37 V adjustable output covers common laboratory and control-rail voltages, while the external resistor network lets the designer select the required level. Place the input and output bypass capacitors close to the device and account for linear dissipation when VIN and VOUT differ substantially.
Recommended
Sensor excitation and reference circuits
An adjustable LM317LD13TR can provide a compact reference or excitation rail for sensor front ends, particularly when the required voltage is stable but the current demand is modest. The 1.2 V minimum output and resistor-programmable design allow adaptation to different sensor ranges. Use the adjustment network with stable resistors and verify temperature drift and output accuracy in the final enclosure, where thermal gradients can affect precision measurements.
Recommended
Laboratory and educational power supply
The LM317LD13TR is a straightforward choice for laboratory or educational supplies because the resistor adjustment method is easy to implement and troubleshoot. Its adjustable 1.2 V to 37 V output supports multiple benchrail experiments without requiring a complex digital control loop. Add current limiting, protection, and adequate heat spreading around the SO-8 package. For higher currents, choose a regulator variant and heatsink designed for the required dissipation.
Recommended
Embedded control and instrumentation
The LM317LD13TR can generate a local adjustable rail for embedded controllers, transducers, or analog interface boards when the load is below the verified 100 mA listing. Its simple three-terminal topology reduces external active components and makes schematic review straightforward. Keep the regulator close to the protected load, provide input and output capacitors, and ensure the board has enough copper area to dissipate the calculated linear-regulator heat.
Recommended
Precision measurement front ends
Measurement front ends often benefit from a quiet, locally regulated analog rail close to the sensing circuitry. The LM317LD13TR can create an adjustable rail for amplifiers, reference networks, and analog-to-digital input stages, while its low-current profile suits compact instruments. Because the regulator is linear, evaluate heat rise at the highest input voltage and load, and use low-noise resistors and capacitors where measurement precision depends on supply behavior.
Recommended
Small industrial control boards
For small industrial control boards, the LM317LD13TR can provide a simple auxiliary rail for sensors, interface ICs, or relay-control sections when the current remains within the verified device rating. Its wide adjustable output range helps accommodate legacy 24 V and lower-voltage control architectures. Validate industrial temperature requirements, input transients, and isolation requirements separately; the regulator itself does not provide galvanic isolation.
Recommended
Recommended Products Summary
Engineering reference data for LM317LD13TR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM217LD | LM317LD13TR | LM317LBDR2G | LM317KCSE3 | LM2904BIDR |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | onsemi | STMicroelectronics | STMicroelectronics |
| Package | 8-SOIC / SO-8 | SO-8 | 8-SOIC | SOIC-8 | SOIC-8 | SOIC-8 |
Key Differentiators
- Documented low-current operating point (vs LM317LBDR2G)
- Adjustable output with wide range (vs LM217LD)
- SO-8 packaging for compact boards (vs LM2904BIDR)
Design Notes
Estimated: linear-regulator dissipation is approximately P = (VIN - VOUT) × IOUT. For example, at 40 V input, 12 V output, and 100 mA, estimated dissipation is 2.8 W before considering margin. Check the SOIC thermal resistance and use sufficient copper area; derate the design if the calculated junction temperature exceeds the device rating.
Place the input capacitor close to the input pin and the output capacitor close to the output pin. Keep the adjustment resistor divider compact and away from high-current return paths. Confirm capacitor voltage ratings and polarity against the maximum input voltage, and follow the manufacturer layout guidance for the exact LM317LD13TR package.
Do not assume that the generic LM317 current rating applies to LM317LD13TR. The verified distributor description specifies a 100 mA configuration, so higher-load designs require a different regulator or thermal solution. Also verify that any replacement uses the same pinout; an SO-8 package alone does not guarantee pin compatibility.
Compliance Information
The supplied manufacturer and distributor search results do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Verify these attributes with the manufacturer or an authorized distributor before regulated production use.
