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LM317AMDT Linear Voltage Regulator Equivalent & Substitute Parts
Part Overview
The LM317AMDT is a positive adjustable linear voltage regulator IC manufactured by Texas Instruments, housed in a TO-252-3 (DPAK) surface mount package. This device delivers 1.5A output current with adjustable output voltage ranging from 1.25V to 37V, making it suitable for applications requiring regulated power supply with flexible voltage configuration. The main part is currently in Last Time Buy status, necessitating identification of active equivalent and substitute parts to ensure design continuity and supply chain reliability.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | LM317AMDT |
| Package / Case | TO-252-3, DPAK (2 Leads + Tab), SC-63 |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Voltage - Input (Max) | 40V |
| Voltage - Output (Min/Fixed) | 1.25V |
| Voltage - Output (Max) | 37V |
| Current - Output | 1.5A |
| Current - Quiescent (Iq) | 10 mA |
| PSRR | 80dB ~ 65dB (120Hz) |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | -40°C ~ 125°C |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| REACH Status | REACH Unaffected |
Substitute Part Grouping Explanation
Substitution of the LM317AMDT is determined by the following critical parameters:
Mechanical Compatibility: All substitute parts must use the TO-252-3 (DPAK) package with identical pinout configuration to ensure direct PCB compatibility without layout modifications.
Electrical Compatibility: Substitute parts must maintain the same output voltage range (1.25V to 37V minimum/maximum), positive output configuration, and adjustable output type. Maximum input voltage of 40V is a baseline requirement.
Current Rating Consideration: The LM317AMDT provides 1.5A output current. Substitute parts with lower current ratings (500mA) are functionally compatible for applications requiring less than 500mA output current but represent a current derating and must be selected based on actual circuit requirements.
Thermal and Protection Features: All qualified substitutes include over-temperature and short-circuit protection. Over-current protection presence varies and is noted in the comparison table.
Compliance and Status: Active product status and ROHS3 compliance are required for new designs. Moisture sensitivity level and operating temperature range variations are documented for supply chain and environmental considerations.
Parameter Comparison
| Parameter | LM317AMDT (Main) | LM317AMDT/NOPB | LM217MDT-TR | LM317MABDTG | LM317MABDTRKG | LM317MADTRKG | LM317MBDTG | LM317MBDTRKG | LM317MDT-TR | LM317MDTG | LM317MDTRKG |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | STMicroelectronics | onsemi | onsemi | onsemi | onsemi | onsemi | STMicroelectronics | onsemi | onsemi |
| Package / Case | TO-252-3, DPAK | TO-252-3, DPAK | TO-252-3, DPAK | TO-252-3, DPAK | TO-252-3, DPAK | TO-252-3, DPAK | TO-252-3, DPAK | TO-252-3, DPAK | TO-252-3, DPAK | TO-252-3, DPAK | TO-252-3, DPAK |
| Output Configuration | Positive | Positive | Positive | Positive | Positive | Positive | Positive | Positive | Positive | Positive | Positive |
| Output Type | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable |
| Voltage - Input (Max) | 40V | 40V | 40V | 40V | 40V | 40V | 40V | 40V | 40V | 40V | 40V |
| Voltage - Output (Min/Fixed) | 1.25V | 1.25V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V |
| Voltage - Output (Max) | 37V | 37V | 37V | 37V | 37V | 37V | 37V | 37V | 37V | 37V | 37V |
| Current - Output | 1.5A | 1.5A | 500mA | 500mA | 500mA | 500mA | 500mA | 500mA | 500mA | 500mA | 500mA |
| Current - Quiescent (Iq) | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA |
| PSRR | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) | 80dB ~ 65dB (120Hz) |
| Protection Features | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit | Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C | 0°C ~ 125°C | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | 0°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | 0°C ~ 125°C (TJ) | 0°C ~ 125°C (TJ) | 0°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 2 (1 Year) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| REACH Status | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
Direct Equivalent (Full Current Rating): The LM317AMDT/NOPB from Texas Instruments is the direct equivalent, maintaining 1.5A output current and identical electrical specifications. This part is in Active product status and carries MSL 2 (1 Year) moisture sensitivity, requiring standard handling procedures. Selection of this part ensures no circuit redesign or thermal management modifications are necessary.
Current-Derated Substitutes (500mA Rating): All remaining substitute parts operate at 500mA maximum output current, representing a 67% reduction from the original 1.5A specification. These parts are suitable only for applications where the actual load current does not exceed 500mA. Current-derated substitutes include variants from onsemi and STMicroelectronics across multiple packaging options (Tube, Cut Tape & Digi-Reel, Tape & Reel).
Manufacturer and Packaging Variants: onsemi supplies the highest inventory levels across multiple part numbers (LM317MBDTG: 485,300 pcs; LM317MBDTRKG: 475,300 pcs; LM317MDTG: 475,400 pcs). STMicroelectronics provides LM317MDT-TR and LM217MDT-TR variants with 150,200 pcs and 146,942 pcs inventory respectively. Packaging selection (Tube, Cut Tape & Digi-Reel, Tape & Reel) depends on assembly process requirements and volume considerations.
Operating Temperature Considerations: Parts with 0°C to 125°C operating range (LM217MDT-TR, LM317MADTRKG, LM317MDT-TR, LM317MDTG, LM317MDTRKG) are restricted from -40°C operation. Applications requiring full -40°C to 125°C range must select parts explicitly rated for this temperature span.
Protection Feature Variance: LM217MDT-TR from STMicroelectronics lacks over-current protection, providing only over-temperature and short-circuit protection. All other substitutes include complete protection feature set matching the original LM317AMDT specification.
Compliance Status: All substitute parts maintain ROHS3 compliance and REACH Unaffected status, meeting regulatory requirements for new product designs. Moisture sensitivity level is MSL 1 (Unlimited) for all substitutes except LM317AMDT/NOPB (MSL 2, 1 Year), providing superior shelf-life characteristics for inventory management.
Frequently Asked Questions (FAQ)
Q: Can I use a 500mA rated substitute in place of the 1.5A LM317AMDT?
A: Only if your circuit load current does not exceed 500mA. The 500mA-rated substitutes (LM317MABDTG, LM317MBDTG, LM317MDTG, and others) are electrically compatible but current-limited. Exceeding 500mA output will trigger over-current protection or cause thermal shutdown. Verify actual load requirements before substitution.
Q: What is the difference between LM317AMDT and LM317AMDT/NOPB?
A: Both are Texas Instruments products with identical electrical specifications and 1.5A output current. The primary difference is moisture sensitivity level: LM317AMDT is MSL 1 (Unlimited shelf life), while LM317AMDT/NOPB is MSL 2 (1 Year shelf life). The /NOPB suffix indicates lead-free plating. Both are mechanically and electrically interchangeable.
Q: Are onsemi and STMicroelectronics substitutes pin-compatible with the original?
A: Yes. All substitute parts use the TO-252-3 (DPAK) package with identical pinout: two leads plus tab configuration. Direct PCB replacement is possible without layout modifications. Verify part number suffix for packaging type (Tube, Cut Tape & Digi-Reel, or Tape & Reel) to match your assembly process.
Q: Why do some substitutes have 0°C minimum operating temperature instead of -40°C?
A: Operating temperature range is a specified parameter that varies by manufacturer and part variant. LM217MDT-TR, LM317MADTRKG, LM317MDT-TR, LM317MDTG, and LM317MDTRKG are rated 0°C to 125°C. Applications requiring operation below 0°C must use parts explicitly rated -40°C to 125°C (LM317AMDT, LM317AMDT/NOPB, LM317MABDTG, LM317MABDTRKG, LM317MBDTG, LM317MBDTRKG).
Q: What is the significance of the packaging suffix (MDTG vs. MDTRKG)?
A: Packaging suffix indicates delivery format. MDTG denotes Tube packaging, while MDTRKG denotes Cut Tape & Digi-Reel packaging. MDT-TR indicates Tape & Reel format. All three formats contain identical die and electrical specifications; selection depends on assembly equipment compatibility and volume requirements.
Q: Does LM217MDT-TR lack over-current protection compared to other substitutes?
A: Correct. LM217MDT-TR provides over-temperature and short-circuit protection only, without over-current protection. All other substitutes include complete protection feature set (over-current, over-temperature, short-circuit). For applications requiring over-current protection, select alternatives from the onsemi or Texas Instruments product lines.
Q: What inventory levels should I consider for supply chain planning?
A: onsemi variants offer the highest inventory: LM317MBDTG (485,300 pcs) and LM317MBDTRKG (475,300 pcs). STMicroelectronics LM317MDT-TR provides 150,200 pcs. Texas Instruments LM317AMDT/NOPB has 4,699 pcs available. For long-term supply security, onsemi parts provide the largest buffer stock.
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