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LM285D-2.5 Equivalent & Substitute Parts
Part Overview
The LM285D-2.5 is a shunt voltage reference IC manufactured by onsemi, providing a fixed 2.5V output with ±1.5% tolerance. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. The LM285D-2.5 operates in the -40°C to 85°C temperature range and is packaged in 8-SOIC surface mount configuration, making it suitable for precision voltage reference applications in power management circuits.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reference Type | Shunt |
| Output Type | Fixed |
| Voltage - Output (Min/Fixed) | 2.5V |
| Current - Output | 20 mA |
| Tolerance | ±1.5% |
| Noise - 10Hz to 10kHz | 120µVrms |
| Current - Cathode | 30 µA |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the LM285D-2.5 is determined by strict equivalence across the following critical parameters:
- Reference Type: Shunt
- Output Voltage: 2.5V (fixed)
- Output Current: 20 mA
- Tolerance: ±1.5%
- Noise Performance: 120µVrms (10Hz to 10kHz)
- Operating Temperature Range: -40°C to 85°C
- Package: 8-SOIC surface mount
Substitute parts are grouped into two categories:
Direct Substitutes maintain identical electrical specifications and differ only in product status or packaging format. These parts are pin-compatible and functionally equivalent with no circuit modifications required.
Similar Substitutes maintain core electrical specifications (voltage, current, tolerance, noise) but may exhibit variations in temperature coefficient or cathode current. These parts are electrically compatible and mechanically interchangeable but may introduce minor performance variations in temperature-dependent applications.
Parameter Comparison
| Part Number | Manufacturer | Voltage Output | Current Output | Tolerance | Temp Coeff (ppm/°C) | Cathode Current | Product Status | RoHS Status | Packaging |
|---|---|---|---|---|---|---|---|---|---|
| LM285D-2.5 | onsemi | 2.5V | 20 mA | ±1.5% | 80 (Typical) | 30 µA | Obsolete | RoHS non-compliant | 8-SOIC |
| LM285D-2.5G | onsemi | 2.5V | 20 mA | ±1.5% | 80 (Typical) | 30 µA | Active | ROHS3 Compliant | 8-SOIC (Tube) |
| LM285D-2-5 | Texas Instruments | 2.5V | 20 mA | ±1.5% | 20 (Typical) | 20 µA | Last Time Buy | ROHS3 Compliant | 8-SOIC (Tube) |
| LM285BXM-2.5/NOPB | Texas Instruments | 2.5V | 20 mA | ±1.5% | 30 | 20 µA | Active | ROHS3 Compliant | 8-SOIC (Tube) |
| LM285BXMX-2.5/NOPB | Texas Instruments | 2.5V | 20 mA | ±1.5% | 30 | 20 µA | Active | ROHS3 Compliant | 8-SOIC (CT & Digi-Reel) |
| LM285BYM-2.5/NOPB | Texas Instruments | 2.5V | 20 mA | ±1.5% | 50 | 20 µA | Active | ROHS3 Compliant | 8-SOIC (Tube) |
| LM285BYMX-2.5/NOPB | Texas Instruments | 2.5V | 20 mA | ±1.5% | 50 | 20 µA | Active | ROHS3 Compliant | 8-SOIC (Tape & Reel) |
| LM285DG4-2-5 | Texas Instruments | 2.5V | 20 mA | ±1.5% | 20 (Typical) | 20 µA | Obsolete | ROHS3 Compliant | 8-SOIC |
| LM285DR-2-5 | Texas Instruments | 2.5V | 20 mA | ±1.5% | 20 (Typical) | 20 µA | Last Time Buy | ROHS3 Compliant | 8-SOIC (CT & Digi-Reel) |
| LM285DRG4-2-5 | Texas Instruments | 2.5V | 20 mA | ±1.5% | 20 (Typical) | 20 µA | Obsolete | ROHS3 Compliant | 8-SOIC (Cut Tape) |
| LM285M-2.5/NOPB | Texas Instruments | 2.5V | 20 mA | ±1.5% | 150 | 20 µA | Active | ROHS3 Compliant | 8-SOIC (Tube) |
Engineering Selection Recommendations
For New Designs (Active Status Required):
LM285D-2.5G (onsemi) is the direct active equivalent with identical electrical specifications and RoHS3 compliance. This part maintains the original 80 ppm/°C temperature coefficient and 30 µA cathode current, ensuring drop-in compatibility.
Alternatively, Texas Instruments LM285BXM-2.5/NOPB or LM285BXMX-2.5/NOPB provide active alternatives with improved temperature coefficient (30 ppm/°C) and reduced cathode current (20 µA), suitable for applications requiring enhanced thermal stability.
For Temperature-Sensitive Applications:
LM285DR-2-5 (Texas Instruments) offers superior temperature coefficient performance (20 ppm/°C typical) compared to the original part (80 ppm/°C), reducing output voltage drift across the operating temperature range. This part is available in Last Time Buy status with substantial inventory.
For RoHS Compliance:
All Texas Instruments variants (LM285D-2-5, LM285BXM-2.5/NOPB, LM285BXMX-2.5/NOPB, LM285BYM-2.5/NOPB, LM285BYMX-2.5/NOPB, LM285DR-2-5, LM285DRG4-2-5, LM285M-2.5/NOPB) and LM285D-2.5G (onsemi) meet ROHS3 compliance requirements. The original LM285D-2.5 is RoHS non-compliant.
For Packaging Flexibility:
LM285BXMX-2.5/NOPB and LM285BYMX-2.5/NOPB are available in Tape & Reel format for high-volume automated assembly. LM285DR-2-5 and LM285DRG4-2-5 support Cut Tape & Digi-Reel packaging options.
Frequently Asked Questions (FAQ)
Q: Can LM285D-2.5G be used as a direct replacement for LM285D-2.5?
A: Yes. LM285D-2.5G maintains identical electrical specifications (2.5V output, 20 mA current, ±1.5% tolerance, 120µVrms noise) and 8-SOIC package configuration. The primary differences are active product status and RoHS3 compliance. No circuit modifications are required.
Q: What is the impact of temperature coefficient variation among substitute parts?
A: Temperature coefficient determines output voltage drift across the operating temperature range. The original LM285D-2.5 exhibits 80 ppm/°C drift. Substitute parts range from 20 ppm/°C (LM285DR-2-5, LM285DRG4-2-5, LM285D-2-5) to 150 ppm/°C (LM285M-2.5/NOPB). For applications requiring stable reference voltage across temperature extremes, lower temperature coefficient variants are preferred.
Q: Are all substitute parts pin-compatible with the original LM285D-2.5?
A: Yes. All listed substitute parts use the 8-SOIC package with identical pinout. Physical and electrical pin compatibility is maintained across all variants.
Q: What packaging options are available for high-volume production?
A: LM285BXMX-2.5/NOPB and LM285BYMX-2.5/NOPB are supplied in Tape & Reel format. LM285DR-2-5 and LM285DRG4-2-5 support Cut Tape & Digi-Reel packaging. Tube packaging is available for LM285D-2.5G, LM285D-2-5, LM285BXM-2.5/NOPB, LM285BYM-2.5/NOPB, and LM285M-2.5/NOPB.
Q: Which substitute part offers the best long-term availability?
A: LM285D-2.5G (onsemi) carries Active product status with 1,402 units in stock. Texas Instruments LM285DR-2-5 is in Last Time Buy status with 171,966 units available, providing substantial inventory for near-term requirements. LM285BXM-2.5/NOPB, LM285BXMX-2.5/NOPB, LM285BYM-2.5/NOPB, and LM285BYMX-2.5/NOPB all maintain Active status.
Q: Does cathode current variation affect circuit design?
A: The original LM285D-2.5 specifies 30 µA cathode current. Most Texas Instruments variants specify 20 µA. This 10 µA difference is negligible in typical applications but should be verified if the design relies on precise cathode current characteristics for biasing or compensation networks.
Q: Are all substitute parts REACH compliant?
A: Yes. All listed parts, including the original LM285D-2.5, carry REACH Unaffected status.
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