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LM385LP-2-5 Equivalent & Substitute Parts
Part Overview
The LM385LP-2-5 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 2.5V output with ±3% tolerance. This through-hole component operates across 0°C to 70°C and is classified as Active product status. Shunt voltage references are essential in precision analog circuits for establishing stable reference voltages in measurement, regulation, and calibration applications. Alternative models become necessary when design requirements demand tighter tolerance specifications, extended temperature ranges, or improved temperature coefficient performance.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Reference Type | Shunt |
| Output Voltage | 2.5V Fixed |
| Output Current | 20 mA |
| Tolerance | ±3% |
| Temperature Coefficient | 20 ppm/°C Typical |
| Noise (10Hz to 10kHz) | 120 µVrms |
| Cathode Current | 20 µA |
| Operating Temperature | 0°C to 70°C |
| Package | TO-92-3 (TO-226-3) |
| Mounting Type | Through Hole |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the LM385LP-2-5 is determined by the following critical parameters:
Primary Compatibility Criteria:
- Output voltage: 2.5V fixed
- Output current: 20 mA
- Package type: TO-92-3 (TO-226-3)
- Mounting type: Through hole
- Reference type: Shunt
Secondary Selection Criteria:
- Tolerance: ±3% or tighter (±1.5%)
- Temperature coefficient: Lower values indicate better stability
- Operating temperature range: Must encompass or exceed 0°C to 70°C
- Compliance certifications: RoHS3, REACH status
Substitute parts are grouped into two categories: direct equivalents maintaining ±3% tolerance, and upgraded alternatives offering ±1.5% tolerance with improved temperature performance. All listed substitutes maintain identical output voltage, current ratings, and package specifications.
Parameter Comparison
| Part Number | Manufacturer | Tolerance | Temp Coeff (ppm/°C) | Operating Temp (°C) | Cathode Current (µA) | Inventory (Pcs) |
|---|---|---|---|---|---|---|
| LM385LP-2-5 | Texas Instruments | ±3% | 20 Typical | 0 to 70 | 20 | 1,377 |
| LM385Z-2.5/NOPB | Texas Instruments | ±3% | 150 | 0 to 70 | 20 | 18,900 |
| LM385LPE3-2-5 | Texas Instruments | ±3% | 20 Typical | 0 to 70 | 20 | 12,900 |
| LM385BXZ-2.5/NOPB | Texas Instruments | ±1.5% | 30 | 0 to 70 | 20 | 669,239 |
| LM385BYZ-2.5/NOPB | Texas Instruments | ±1.5% | 50 | 0 to 70 | 20 | 1,122 |
| LM385BZ-2.5/NOPB | National Semiconductor | ±1.5% | 150 | 0 to 70 | 20 | 8,960 |
| LM285BYZ-2.5/NOPB | Texas Instruments | ±1.5% | 50 | -40 to 85 | 20 | 5,100 |
| LM285BXZ-2.5/NOPB | National Semiconductor | ±1.5% | 30 | -40 to 85 | 20 | 1,395 |
| LM285Z-2.5/NOPB | Texas Instruments | ±1.5% | 150 | -40 to 85 | 20 | 16,908 |
| LM285Z-2.5G | onsemi | ±1.5% | 80 Typical | -40 to 85 | 30 | 75,100 |
| LM385BZ-2.5G | onsemi | ±1.5% | 80 Typical | 0 to 70 | 30 | 2,240 |
Engineering Selection Recommendations
Direct Equivalents (±3% Tolerance, 0°C to 70°C):
LM385Z-2.5/NOPB and LM385LPE3-2-5 maintain identical tolerance and temperature specifications as the LM385LP-2-5. Both are Active status products with ROHS3 compliance. LM385Z-2.5/NOPB offers significantly higher inventory availability (18,900 units). LM385LPE3-2-5 provides superior temperature coefficient performance (20 ppm/°C typical versus 150 ppm/°C), making it preferable for applications requiring enhanced thermal stability within the same tolerance class.
Upgraded Alternatives (±1.5% Tolerance):
For applications demanding tighter tolerance specifications, LM385BXZ-2.5/NOPB delivers ±1.5% accuracy with 30 ppm/°C temperature coefficient and maintains the 0°C to 70°C operating range. This part offers exceptional inventory depth (669,239 units) and represents the optimal choice for precision applications within the standard temperature window. All upgraded alternatives are Active status with ROHS3 compliance.
Extended Temperature Range Options:
LM285 series parts (LM285BYZ-2.5/NOPB, LM285BXZ-2.5/NOPB, LM285Z-2.5/NOPB, LM285Z-2.5G) extend operating temperature to -40°C to 85°C. These are suitable only when the application requires operation beyond the standard 0°C to 70°C range. LM285Z-2.5G (onsemi) provides the highest inventory availability (75,100 units) among extended-range options.
All recommended substitutes maintain identical 2.5V output, 20 mA current rating, TO-92-3 package, and through-hole mounting configuration.
Frequently Asked Questions (FAQ)
Q: Can LM385LP-2-5 be replaced with LM385Z-2.5/NOPB?
A: Yes. Both parts share identical tolerance (±3%), output voltage (2.5V), current rating (20 mA), operating temperature range (0°C to 70°C), and TO-92-3 package. The primary difference is temperature coefficient (20 ppm/°C typical versus 150 ppm/°C), with LM385LP-2-5 offering superior thermal stability. LM385Z-2.5/NOPB is a direct functional equivalent with higher inventory availability.
Q: What is the difference between LM385 and LM285 series?
A: Both are 2.5V shunt voltage references in TO-92-3 packages. LM385 series operates 0°C to 70°C with ±3% tolerance (standard grade) or ±1.5% tolerance (B-grade). LM285 series operates -40°C to 85°C with ±1.5% tolerance. Selection depends on required temperature range and tolerance specifications. LM285 parts are necessary only for extended temperature applications.
Q: Why do some parts show higher cathode current (30 µA versus 20 µA)?
A: Cathode current variation reflects different semiconductor process technologies. LM285Z-2.5G and LM385BZ-2.5G (onsemi) specify 30 µA cathode current. This parameter affects circuit biasing but does not prevent substitution when other electrical parameters match. Verify circuit design accommodates the specified cathode current range.
Q: Are all listed parts RoHS3 compliant?
A: All listed substitutes are ROHS3 compliant and REACH unaffected. Compliance certifications are consistent across the entire substitute list, ensuring regulatory compatibility for applications requiring environmental compliance documentation.
Q: Can LM385LP-2-5 be used in applications requiring -40°C to 85°C operation?
A: No. LM385LP-2-5 is rated 0°C to 70°C only. For extended temperature range applications, use LM285 series parts (LM285BYZ-2.5/NOPB, LM285BXZ-2.5/NOPB, LM285Z-2.5/NOPB, or LM285Z-2.5G), which are specified -40°C to 85°C.
Q: Which substitute offers the best temperature coefficient performance?
A: LM385LP-2-5 and LM385LPE3-2-5 both specify 20 ppm/°C typical temperature coefficient, representing the lowest values in the substitute list. LM385BXZ-2.5/NOPB follows with 30 ppm/°C. Superior temperature coefficient indicates reduced output voltage drift across the operating temperature range.
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