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LM285DG4-1-2 Equivalent & Substitute Parts
Part Overview
The LM285DG4-1-2 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 1.235V output with ±1% tolerance. Classified as a Power Management (PMIC) component, this 8-SOIC surface mount device operates across the industrial temperature range of -40°C to 85°C and is rated for 20 mA output current. The part is currently listed as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reference Type | Shunt |
| Output Type | Fixed |
| Voltage - Output (Min/Fixed) | 1.235V |
| Current - Output | 20 mA |
| Tolerance | ±1% |
| Temperature Coefficient | 20ppm/°C Typical |
| Noise - 10Hz to 10kHz | 60µVrms |
| Current - Cathode | 10 µA |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the LM285DG4-1-2 is determined by strict alignment of the following electrical and mechanical parameters:
- Output Voltage: 1.235V fixed output (all substitutes maintain this specification)
- Output Current: 20 mA (all substitutes maintain this specification)
- Tolerance: ±1% (primary substitutes maintain this tolerance; LM385M-1.2/NOPB and LM385MX-1.2/NOPB use asymmetric tolerance -2.43%, +2.02%)
- Package: 8-SOIC form factor with 0.154" width (all substitutes use identical package)
- Temperature Coefficient: Ranges from 20ppm/°C to 150ppm/°C across substitute options
- Operating Temperature Range: -40°C to 85°C (primary substitutes); 0°C to 70°C (LM385 series variants)
- Cathode Current: 10 µA (primary substitutes); 15 µA (LM385 series variants)
- Product Status: Active alternatives available; original part is obsolete
Substitutes are grouped by temperature coefficient performance and operating temperature range. Parts with tighter temperature coefficients (20ppm/°C to 50ppm/°C) provide superior stability. Parts with extended industrial temperature range (-40°C to 85°C) maintain full specification across wider environmental conditions.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Voltage Output | Tolerance | Temp Coeff (ppm/°C) | Operating Temp | Cathode Current | Packaging |
|---|---|---|---|---|---|---|---|---|
| LM285DG4-1-2 | Texas Instruments | Obsolete | 1.235V | ±1% | 20 | -40°C ~ 85°C | 10 µA | Tube |
| LM285BXM-1.2/NOPB | National Semiconductor | Active | 1.235V | ±1% | 30 | -40°C ~ 85°C | 10 µA | Bulk |
| LM285BXMX-1.2/NOPB | Texas Instruments | Active | 1.235V | ±1% | 30 | -40°C ~ 85°C | 10 µA | Tape & Reel |
| LM285BYM-1.2/NOPB | Texas Instruments | Active | 1.235V | ±1% | 50 | -40°C ~ 85°C | 10 µA | Tube |
| LM285BYMX-1.2/NOPB | Texas Instruments | Active | 1.235V | ±1% | 50 | -40°C ~ 85°C | 10 µA | Tape & Reel |
| LM285M-1.2/NOPB | Texas Instruments | Active | 1.235V | ±1% | 150 | -40°C ~ 85°C | 10 µA | Tube |
| LM285MX-1.2/NOPB | Texas Instruments | Active | 1.235V | ±1% | 150 | -40°C ~ 85°C | 10 µA | Cut Tape & Digi-Reel |
| LM385BM-1.2/NOPB | Texas Instruments | Active | 1.235V | ±1% | 150 | 0°C ~ 70°C | 15 µA | Tube |
| LM385BMX-1.2/NOPB | Texas Instruments | Active | 1.235V | ±1% | 150 | 0°C ~ 70°C | 15 µA | Tape & Reel |
| LM385M-1.2/NOPB | Texas Instruments | Active | 1.235V | -2.43%, +2.02% | 150 | 0°C ~ 70°C | 15 µA | Tube |
| LM385MX-1.2/NOPB | Texas Instruments | Active | 1.235V | -2.43%, +2.02% | 150 | 0°C ~ 70°C | 15 µA | Tape & Reel |
Engineering Selection Recommendations
Primary Substitutes (Full Compatibility)
LM285BXMX-1.2/NOPB and LM285BYM-1.2/NOPB are direct functional equivalents. Both maintain the industrial temperature range (-40°C to 85°C), ±1% tolerance, 10 µA cathode current, and 8-SOIC package. LM285BXMX-1.2/NOPB offers superior temperature stability (30ppm/°C) and is available in Tape & Reel packaging for automated assembly. LM285BYM-1.2/NOPB provides moderate temperature coefficient (50ppm/°C) in Tube packaging. Both are ROHS3 compliant and carry MSL 1 rating.
Secondary Substitutes (Temperature Range Limitation)
LM385BM-1.2/NOPB and LM385BMX-1.2/NOPB operate within the commercial temperature range (0°C to 70°C), narrower than the original part's industrial specification. These are suitable only for applications not requiring full -40°C to 85°C operation. Cathode current is 15 µA versus the original 10 µA. Both are ROHS3 compliant with MSL 1 rating.
Tolerance Variants
LM385M-1.2/NOPB and LM385MX-1.2/NOPB employ asymmetric tolerance (-2.43%, +2.02%) rather than the symmetric ±1% specification. These parts are restricted to applications where asymmetric tolerance is acceptable. Operating temperature is limited to 0°C to 70°C.
Packaging Considerations
Tube packaging (LM285BYM-1.2/NOPB, LM285M-1.2/NOPB, LM385BM-1.2/NOPB, LM385M-1.2/NOPB) suits manual assembly and lower-volume production. Tape & Reel variants (LM285BXMX-1.2/NOPB, LM285BYMX-1.2/NOPB, LM385BMX-1.2/NOPB, LM385MX-1.2/NOPB) are optimized for automated pick-and-place assembly.
Frequently Asked Questions (FAQ)
Q: Can LM285BXM-1.2/NOPB directly replace LM285DG4-1-2?
A: LM285BXM-1.2/NOPB is electrically equivalent but differs in packaging (Bulk versus Tube) and temperature coefficient (30ppm/°C versus 20ppm/°C). It maintains ±1% tolerance, 1.235V output, 20 mA current, and -40°C to 85°C operating range. Bulk packaging may require repackaging for tube-based assembly lines.
Q: What is the difference between LM285 and LM385 series substitutes?
A: LM285 series maintains the original -40°C to 85°C industrial temperature range and 10 µA cathode current. LM385 series operates within 0°C to 70°C commercial range with 15 µA cathode current. LM385 variants are suitable only for applications not requiring full industrial temperature specification.
Q: Why do some substitutes have different temperature coefficients?
A: Temperature coefficient (ppm/°C) indicates output voltage drift across temperature. Lower values (20ppm/°C to 50ppm/°C) provide superior stability. Higher values (150ppm/°C) indicate greater voltage variation with temperature. Selection depends on application sensitivity to temperature-induced drift.
Q: Are all substitutes ROHS3 compliant?
A: All listed substitutes are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental certifications.
Q: Which substitute offers the best temperature stability?
A: LM285BXMX-1.2/NOPB provides the tightest temperature coefficient at 30ppm/°C while maintaining full industrial temperature range (-40°C to 85°C) and ±1% tolerance. This part is recommended for applications requiring maximum output voltage stability across temperature extremes.
Q: Can I use LM385M-1.2/NOPB in place of LM285DG4-1-2?
A: LM385M-1.2/NOPB is not a direct substitute. It operates within 0°C to 70°C (not -40°C to 85°C), uses asymmetric tolerance (-2.43%, +2.02% instead of ±1%), and draws 15 µA cathode current (versus 10 µA). Use only if your application operates within the narrower temperature range and accepts asymmetric tolerance.
Q: What packaging should I select for automated assembly?
A: Tape & Reel variants (LM285BXMX-1.2/NOPB, LM285BYMX-1.2/NOPB, LM385BMX-1.2/NOPB, LM385MX-1.2/NOPB) are optimized for automated pick-and-place equipment. Tube packaging is suitable for manual assembly or lower-volume production runs.
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