LM317AMDT Texas Instruments Integrated Circuit (TO-XXX (Inc. DPAK)) In Stock
LM317AMDT is a 1.5A adjustable positive linear voltage regulator from Texas Instruments, supporting 1.25V to 37V output with up to 40V input voltage. Features low dropout, excellent line and load regulation. From $1.24, in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- TO-XXX (Inc. DPAK)
- Pin Count
- 3
- Lifecycle
- OBSOLETE
- Datasheet
- LM317AMDT Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.2350(MOQ 1)
- 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 voltage from 1.25V to 37V with a single external resistor divider
- 1.5A continuous output current capability for demanding power supply designs
- Low 2.25V typical dropout voltage enabling efficient regulation
- Wide 3V to 40V input voltage range for flexible power input compatibility
- TO-252 (DPAK) surface-mount package for compact PCB footprint and improved thermal performance
Applications
The LM317AMDT is widely used in adjustable bench power supplies, battery chargers, and post-regulator circuits where a stable, adjustable DC output is required. Its surface-mount TO-252 package makes it ideal for consumer electronics, industrial control boards, and telecommunications equipment needing compact regulated power rails. It also serves well in motor drive pre-regulation and LED driver applications requiring precise current or voltage control.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Adjustability | ADJUSTABLE |
| Dropout Voltage1-Nom | 2.25V |
| Input Voltage-Max | 40V |
| Input Voltage-Min | 3V |
| Input-Output Voltage Differential-Max | 40V |
| Input-Output Voltage Differential-Min | 3V |
| JESD-30 Code | R-PSSO-G2 |
| JESD-609 Code | e0 |
| Line Regulation-Max (%/V) | 0.02 |
| Load Regulation-Max(%) | 1% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 1.5A |
| Output Voltage1-Max | 37V |
| Output Voltage1-Min | 1.2V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SMSIP3H,.38,90TB |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 235 |
| Qualification Status | Not Qualified |
| Regulator Type | ADJUSTABLE POSITIVE SINGLE OUTPUT STANDARD REGULATOR |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form | GULL WING |
| Terminal Pitch | 2.285mm |
| Terminal Position | SINGLE |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Voltage Tolerance-Max | 5% |
| ## LM317AMDT Alternates Showing results | Image |
| Package | TO-XXX (Inc. DPAK) |
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 LM317AMDT:
Regulator, 1.2V Min, 37V Max, BIPolar, PSSO2
Regulator, 1.2V Min, 37V Max, BIPolar, PSSO2
Regulator, 1.2V Min, 37V Max, BIPolar, PSSO2
Regulator, 1.2V Min, 37V Max, BIPolar, PSSO2
suggested
suggested
Frequently Asked Questions
What is the output voltage range of the LM317AMDT?
The LM317AMDT provides an adjustable output voltage from 1.25V to 37V, set by two external resistors. The input voltage can range from 3V to 40V, and the input-to-output differential can be up to 40V, giving designers broad flexibility for various regulated supply designs.
How much output current can the LM317AMDT supply?
The LM317AMDT is rated for a continuous output current of 1.5A. Its TO-252 (DPAK) surface-mount package provides good thermal dissipation; proper heatsinking or PCB copper pour is recommended when operating near the maximum current to keep junction temperatures within safe limits.
What package does the LM317AMDT use and how does it differ from through-hole LM317 variants?
The LM317AMDT comes in a TO-252 (DPAK) surface-mount package, which differs from the through-hole TO-220 or TO-92 variants. The DPAK package is designed for reflow soldering on PCBs, offers a smaller footprint, and the exposed pad improves thermal conductivity to the board compared to through-hole alternatives.
What are typical applications for the LM317AMDT?
Typical applications include adjustable bench power supplies, battery charging circuits, precision current sources, post-regulators in switching power supplies, and LED driver circuits. Its wide input voltage range and adjustable output make it suitable for industrial control, consumer electronics, and telecommunications power conditioning.
What is the dropout voltage of the LM317AMDT and why does it matter?
The LM317AMDT has a typical dropout voltage of 2.25V, meaning the input must exceed the desired output by at least this amount to maintain regulation. This parameter is critical when designing power supplies where input-output voltage headroom is limited, helping engineers size transformers or input rails appropriately.
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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.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $3.8000 | $3.80 |
| 3+ | $3.6100 | $10.83 |
| 8+ | $2.7075 | $21.66 |
| 36+ | $1.7670 | $63.61 |
| 106+ | $1.3300 | $140.98 |
| 227+ | $1.2350 | $280.35 |
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