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LM285DRG4-2-5 Equivalent & Substitute Parts
Part Overview
The LM285DRG4-2-5 is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications requiring a fixed 2.5V output. This component operates as a fixed output type reference with ±1.5% tolerance and is housed in an 8-SOIC surface mount package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives from the LM285 and LM385 series provide direct functional replacement with maintained electrical specifications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LM285DRG4-2-5 |
| Manufacturer | Texas Instruments |
| Reference Type | Shunt |
| Output Type | Fixed |
| Voltage - Output (Min/Fixed) | 2.5V |
| Current - Output | 20 mA |
| Tolerance | ±1.5% |
| Temperature Coefficient | 20ppm/°C Typical |
| Noise - 10Hz to 10kHz | 120µVrms |
| Current - Cathode | 20 µA |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the LM285DRG4-2-5 is determined by strict alignment of the following critical parameters:
Core Electrical Requirements:
- Reference Type: Shunt
- Output Type: Fixed
- Voltage - Output: 2.5V
- Current - Output: 20 mA
- Tolerance: ±1.5%
- Noise - 10Hz to 10kHz: 120µVrms
- Current - Cathode: 20 µA
Physical & Environmental Requirements:
- Package / Case: 8-SOIC (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
- Operating Temperature: -40°C ~ 85°C (TA)
Compliance Requirements:
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
Substitute parts are grouped into two categories based on temperature coefficient performance and operating temperature range. The LM285 series variants maintain the full -40°C ~ 85°C operating range with temperature coefficients ranging from 20ppm/°C to 150ppm/°C. The LM385 series variants operate within a narrower 0°C ~ 70°C temperature range but provide equivalent electrical performance within that specification. All substitutes maintain identical package geometry, tolerance, output voltage, and noise characteristics.
Parameter Comparison
| Part Number | Manufacturer | Tolerance | Temp Coeff (ppm/°C) | Operating Temp (°C) | Packaging | Product Status |
|---|---|---|---|---|---|---|
| LM285DRG4-2-5 | Texas Instruments | ±1.5% | 20 | -40 ~ 85 | Cut Tape (CT) | Obsolete |
| LM285BXM-2.5/NOPB | Texas Instruments | ±1.5% | 30 | -40 ~ 85 | Tube | Active |
| LM285BXMX-2.5/NOPB | Texas Instruments | ±1.5% | 30 | -40 ~ 85 | Cut Tape (CT) & Digi-Reel® | Active |
| LM285BYM-2.5/NOPB | Texas Instruments | ±1.5% | 50 | -40 ~ 85 | Tube | Active |
| LM285BYMX-2.5/NOPB | Texas Instruments | ±1.5% | 50 | -40 ~ 85 | Tape & Reel (TR) | Active |
| LM285M-2.5/NOPB | Texas Instruments | ±1.5% | 150 | -40 ~ 85 | Tube | Active |
| LM285MX-2.5/NOPB | Texas Instruments | ±1.5% | 150 | -40 ~ 85 | Cut Tape (CT) & Digi-Reel® | Active |
| LM385BM-2.5/NOPB | National Semiconductor | ±1.5% | 150 | 0 ~ 70 | Bulk | Active |
| LM385BMX-2.5/NOPB | Texas Instruments | ±1.5% | 150 | 0 ~ 70 | Tape & Reel (TR) | Active |
| LM385M-2.5/NOPB | Texas Instruments | ±3% | 150 | 0 ~ 70 | Tube | Active |
| LM385MX-2.5/NOPB | National Semiconductor | ±3% | 150 | 0 ~ 70 | Bulk | Active |
Engineering Selection Recommendations
Primary Substitutes (Full Specification Match):
LM285BXM-2.5/NOPB and LM285BXMX-2.5/NOPB are the recommended primary substitutes. Both maintain the full -40°C ~ 85°C operating temperature range of the original part, ±1.5% tolerance, and all core electrical specifications. These parts are active products from Texas Instruments with ROHS3 compliance and MSL 1 rating. The difference between these two is packaging format: Tube versus Cut Tape & Digi-Reel®.
Secondary Substitutes (Extended Temperature Coefficient):
LM285BYM-2.5/NOPB, LM285BYMX-2.5/NOPB, LM285M-2.5/NOPB, and LM285MX-2.5/NOPB are suitable substitutes when temperature coefficient performance is not a critical constraint. All maintain the -40°C ~ 85°C operating range and ±1.5% tolerance. These parts differ in temperature coefficient (50ppm/°C or 150ppm/°C) and packaging options. Selection among these should be based on required packaging format and temperature stability requirements.
Alternative Substitutes (Restricted Temperature Range):
LM385BM-2.5/NOPB, LM385BMX-2.5/NOPB are functionally equivalent but operate within a narrower 0°C ~ 70°C temperature range. These are suitable only for applications where the operating environment does not require the extended -40°C ~ 85°C specification. Both maintain ±1.5% tolerance and all core electrical specifications.
Not Recommended:
LM385M-2.5/NOPB and LM385MX-2.5/NOPB have ±3% tolerance, which exceeds the ±1.5% specification of the original part and are not suitable substitutes for applications requiring the tighter tolerance.
Frequently Asked Questions (FAQ)
Q: Can I use LM385 series parts as direct replacements for LM285DRG4-2-5?
A: LM385BM-2.5/NOPB and LM385BMX-2.5/NOPB are electrically equivalent within their specified operating range of 0°C ~ 70°C. However, if your application requires operation below 0°C or above 70°C, these parts are not suitable. The LM285 series maintains the full -40°C ~ 85°C range and is preferred for extended temperature applications.
Q: What is the difference between the various LM285 part numbers?
A: The LM285 series variants differ primarily in temperature coefficient and packaging format. LM285BXM/BXMX have 30ppm/°C, LM285BYM/BYMX have 50ppm/°C, and LM285M/MX have 150ppm/°C. All maintain ±1.5% tolerance and -40°C ~ 85°C operation. Choose based on your temperature stability requirements and preferred packaging (Tube, Cut Tape, or Tape & Reel).
Q: Are all substitute parts ROHS3 compliant?
A: All LM285 series substitutes are ROHS3 compliant with MSL 1 rating. LM385BM-2.5/NOPB and LM385MX-2.5/NOPB do not list ROHS3 compliance in their specifications and should be verified with the supplier before use in applications requiring ROHS3 certification.
Q: What packaging options are available for the substitute parts?
A: Substitute parts are available in multiple packaging formats: Tube, Cut Tape (CT), Cut Tape & Digi-Reel®, Tape & Reel (TR), and Bulk. Select based on your assembly process requirements and volume needs. Cut Tape and Tape & Reel formats are standard for automated assembly, while Tube and Bulk are used for manual assembly or specific handling requirements.
Q: Can I substitute parts with different temperature coefficients?
A: Yes, if your circuit design does not require the tighter temperature coefficient of the original 20ppm/°C specification. Parts with 30ppm/°C, 50ppm/°C, or 150ppm/°C are functionally compatible. However, if your application requires temperature stability matching the original 20ppm/°C specification, only LM285BXM-2.5/NOPB or LM285BXMX-2.5/NOPB should be used.
Q: Is the LM285DRG4-2-5 still available for purchase?
A: The LM285DRG4-2-5 is classified as obsolete. Active substitutes from the LM285 and LM385 series are currently available in production quantities and should be used for new designs and ongoing production support.
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