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LM1085IT-ADJ Equivalent & Substitute Parts
Part Overview
The LM1085IT-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This TO-220-3 packaged component delivers 3A output current with adjustable voltage regulation from 1.25V to 15V. The part is currently in Last Time Buy status, making equivalent and substitute parts identification critical for ongoing design support and procurement planning. Alternative components from active product lines provide functional equivalence while maintaining design compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | LM1085IT-ADJ |
| Category | Power Management (PMIC) |
| Package / Case | TO-220-3 |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Current - Output | 3A |
| Voltage - Input (Max) | 29V |
| Voltage - Output (Min/Fixed) | 1.25V |
| Voltage - Output (Max) | 15V |
| Voltage Dropout (Max) | 1.5V @ 3A |
| Current - Quiescent (Iq) | 10 mA |
| PSRR | 75dB (120Hz) |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Protection Features | Over Current, Over Temperature |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the LM1085IT-ADJ is determined by the following critical parameters:
Primary Substitution Criteria:
- Output Configuration: Positive
- Output Type: Adjustable
- Package / Case: TO-220-3 (mechanical and thermal compatibility)
- Number of Regulators: 1
- Voltage - Output (Min/Fixed): 1.25V (minimum adjustable voltage)
- Current - Output: 3A or greater (equal or higher capacity)
- Voltage Dropout (Max): 1.5V @ rated current
- Operating Temperature Range: -40°C ~ 125°C (full industrial range)
- Protection Features: Over Current and Over Temperature
Substitute parts are grouped into two categories:
Category 1: Direct Equivalents (3A Output Current) Parts with identical 3A output current rating, matching voltage specifications, and full -40°C to 125°C operating range. These provide pin-for-pin and functional equivalence.
Category 2: Higher Current Alternatives (5A Output Current) Parts with 5A output current rating provide enhanced current capacity while maintaining adjustable voltage regulation and TO-220-3 packaging. These are suitable for designs requiring additional current margin.
Category 3: Lower Current Alternatives (1.5A Output Current) Parts with 1.5A output current rating are suitable only for applications where the design current requirement does not exceed 1.5A. These represent downrating scenarios.
Parameter Comparison
| Part Number | Manufacturer | Output Current | Voltage Input (Max) | Voltage Output (Min/Max) | Dropout @ Rated Current | Operating Temp | Package | Product Status |
|---|---|---|---|---|---|---|---|---|
| LM1085IT-ADJ | Texas Instruments | 3A | 29V | 1.25V - 15V | 1.5V @ 3A | -40°C ~ 125°C | TO-220-3 | Last Time Buy |
| LM1085IT-ADJ/NOPB | Texas Instruments | 3A | 29V | 1.25V - 15V | 1.5V @ 3A | -40°C ~ 125°C | TO-220-3 | Active |
| LD1085V | STMicroelectronics | 3A | 30V | 1.25V - 28.5V | 1.5V @ 3A | -40°C ~ 125°C | TO-220-3 | Active |
| LT1085IT#PBF | Analog Devices Inc. | 3A | 30V | 1.25V - 28.5V | 1.5V @ 3A | -40°C ~ 125°C | TO-220-3 | Active |
| LT1085CT#PBF | Analog Devices Inc. | 3A | 30V | 1.25V - 28.5V | 1.5V @ 3A | 0°C ~ 125°C | TO-220-3 | Active |
| LD1084V | STMicroelectronics | 5A | 30V | 1.25V - 28.5V | 1.5V @ 5A | -40°C ~ 125°C | TO-220-3 | Active |
| LD1086BV-DG | STMicroelectronics | 1.5A | 30V | 1.25V - 28.5V | 1.5V @ 1.5A | -40°C ~ 125°C | TO-220-3 | Active |
| LT1086IT#PBF | Analog Devices Inc. | 1.5A | 25V | 1.25V - 24.6V | 1.5V @ 1.5A | -40°C ~ 125°C | TO-220-3 | Active |
| LT1086CT#PBF | Analog Devices Inc. | 1.5A | 25V | 1.25V - 24.6V | 1.5V @ 1.5A | 0°C ~ 125°C | TO-220-3 | Active |
Engineering Selection Recommendations
Primary Recommendation: LM1085IT-ADJ/NOPB
LM1085IT-ADJ/NOPB is the direct equivalent from Texas Instruments with Active product status. This part maintains identical electrical specifications, package configuration, and full industrial temperature range (-40°C to 125°C). Selection of this part eliminates any design modification requirements and provides continuity with the original component specification.
Secondary Recommendation: LD1085V (STMicroelectronics)
LD1085V provides functional equivalence with 3A output current, matching voltage adjustment range (1.25V to 28.5V), and full industrial temperature operation. This part is from an active product line with higher input voltage rating (30V vs. 29V) and extended output voltage maximum (28.5V vs. 15V), offering design flexibility. RoHS3 compliance and MSL 1 rating match the original specification.
Secondary Recommendation: LT1085IT#PBF (Analog Devices Inc.)
LT1085IT#PBF delivers 3A output current with full -40°C to 125°C operating range and TO-220-3 packaging. Input voltage rating of 30V and output voltage range of 1.25V to 28.5V provide equivalent or superior performance margins. Active product status ensures long-term availability.
Alternative for Extended Current Capacity: LD1084V (STMicroelectronics)
LD1084V provides 5A output current in TO-220-3 packaging with full industrial temperature range. This part is suitable for designs requiring additional current margin beyond the original 3A specification. Input voltage (30V) and output voltage range (1.25V to 28.5V) exceed original specifications.
Temperature-Constrained Applications: LT1085CT#PBF (Analog Devices Inc.)
LT1085CT#PBF is suitable only for applications with operating temperature range limited to 0°C to 125°C. This part provides 3A output current and equivalent voltage specifications but does not support full industrial temperature range below 0°C.
Lower Current Applications: LD1086BV-DG or LT1086IT#PBF
These 1.5A parts are suitable only for designs where output current requirement does not exceed 1.5A. LD1086BV-DG supports full -40°C to 125°C range with 30V input rating. LT1086IT#PBF also supports full temperature range but with reduced input voltage (25V) and output voltage maximum (24.6V).
Frequently Asked Questions (FAQ)
Q: Can LM1085IT-ADJ be directly replaced with LM1085IT-ADJ/NOPB?
A: Yes. LM1085IT-ADJ/NOPB is the direct equivalent with identical electrical specifications, package configuration, and operating temperature range. The /NOPB suffix indicates lead-free plating and represents the current production variant of the same design.
Q: What is the key difference between 3A and 5A output current parts?
A: Output current rating determines maximum continuous current delivery. The LM1085IT-ADJ is rated for 3A. The LD1084V provides 5A capacity. Selection of a higher-rated part (5A) is acceptable for 3A applications and provides additional current margin. Selection of a lower-rated part (1.5A) is acceptable only if the design current requirement does not exceed 1.5A.
Q: Are all substitute parts available in TO-220-3 packaging?
A: Yes. All listed substitute parts are packaged in TO-220-3, ensuring mechanical and thermal compatibility with the original design. Pin configuration and mounting footprint remain identical.
Q: What is the significance of operating temperature range -40°C to 125°C versus 0°C to 125°C?
A: The -40°C to 125°C range supports full industrial temperature applications. The 0°C to 125°C range is restricted to commercial temperature applications. Selection of a part with 0°C minimum operating temperature (such as LT1085CT#PBF) is acceptable only for designs that do not require operation below 0°C.
Q: Can I use a 1.5A part in place of the 3A LM1085IT-ADJ?
A: Only if your design current requirement does not exceed 1.5A. The 1.5A rating represents the maximum continuous current the part can deliver. Using a 1.5A part in a 3A application will result in thermal shutdown or component failure.
Q: What does RoHS3 compliance mean?
A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the part meets European environmental standards restricting lead, cadmium, mercury, and other hazardous substances. All listed substitute parts maintain RoHS3 compliance.
Q: Are there differences in voltage regulation accuracy between substitute parts?
A: All parts maintain the same minimum adjustable voltage (1.25V) and similar dropout voltage specifications (1.5V @ rated current). Output voltage maximum varies: LM1085IT-ADJ reaches 15V, while STMicroelectronics and Analog Devices parts reach 28.5V or 24.6V. These differences do not affect regulation accuracy but provide extended voltage range capability in alternative parts.
Q: What is MSL 1 (Unlimited) moisture sensitivity?
A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed parts carry MSL 1 rating, eliminating moisture-related procurement or storage constraints.
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