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LM385BZ-1.2 Shunt Voltage Reference IC Equivalent & Substitute Parts
Part Overview
The LM385BZ-1.2 is a micropower shunt voltage reference IC manufactured by onsemi, designed to provide a fixed 1.235V output with ±1% tolerance. This component operates as a precision voltage reference in analog circuits requiring stable reference voltages with minimal power consumption. The main part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements. Active alternatives from multiple manufacturers provide equivalent or improved electrical characteristics while maintaining functional compatibility in TO-92-3 package configurations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reference Type | Shunt |
| Output Type | Fixed |
| Voltage - Output (Min/Fixed) | 1.235V |
| Current - Output | 20 mA |
| Tolerance | ±1% |
| Noise - 10Hz to 10kHz | 60µVrms |
| Current - Cathode | 20 µA |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Mounting Type | Through Hole |
| Package / Case | TO-226-3, TO-92-3 Long Body |
Substitute Part Grouping Explanation
Substitution eligibility for the LM385BZ-1.2 is determined by the following critical parameters:
- Output Voltage: Must be 1.235V fixed
- Output Current: Must support 20 mA minimum
- Tolerance: ±1% or tighter (±2% acceptable with design margin verification)
- Package: TO-92-3 or TO-226-3 compatible
- Mounting Type: Through Hole
- Noise Specification: 60µVrms at 10Hz to 10kHz
- Operating Temperature Range: 0°C ~ 70°C minimum (extended range acceptable)
Parts are classified as direct equivalents when all electrical parameters match within specification. Similar parts meet functional requirements but may have variations in temperature coefficient, cathode current, or tolerance that require circuit-level evaluation. All substitute candidates maintain the same reference voltage output, current rating, and package form factor.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Voltage Output | Tolerance | Temp Coeff (ppm/°C) | Cathode Current (µA) | Operating Temp | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| LM385BZ-1.2 | onsemi | Obsolete | 1.235V | ±1% | 80 Typical | 20 | 0°C ~ 70°C | Non-compliant |
| LM385BZ-1.2G | onsemi | Active | 1.235V | ±1% | 80 Typical | 20 | 0°C ~ 70°C | ROHS3 Compliant |
| LM385BLP-1-2 | Texas Instruments | Active | 1.235V | ±1% | 20 Typical | 15 | 0°C ~ 70°C | ROHS3 Compliant |
| LM285BXZ-1.2/NOPB | Texas Instruments | Active | 1.235V | ±1% | 30 | 10 | -40°C ~ 85°C | ROHS3 Compliant |
| LM285Z-1.2#PBF | Analog Devices Inc. | Active | 1.235V | ±1% | 20 Typical | 10 | -40°C ~ 85°C | ROHS3 Compliant |
| LM285Z-1.2/NOPB | Texas Instruments | Active | 1.235V | ±1% | 150 | 10 | -40°C ~ 85°C | ROHS3 Compliant |
| LM385BLPE3-1-2 | Texas Instruments | Active | 1.235V | ±1% | 20 Typical | 15 | 0°C ~ 70°C | ROHS3 Compliant |
| LM385BXZ-1.2/NOPB | Texas Instruments | Active | 1.235V | ±1% | 30 | 15 | 0°C ~ 70°C | ROHS3 Compliant |
| LM385BYZ-1.2/NOPB | National Semiconductor | Active | 1.235V | ±1% | 50 | 15 | 0°C ~ 70°C | Not specified |
| LM385BZ-1.2/NOPB | Texas Instruments | Active | 1.235V | ±1% | 150 | 15 | 0°C ~ 70°C | ROHS3 Compliant |
| LM385LP-1-2 | Texas Instruments | Active | 1.235V | ±2% | 20 Typical | 15 | 0°C ~ 70°C | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Replacement (Highest Compatibility)
LM385BZ-1.2G from onsemi is the direct active equivalent. It maintains identical electrical specifications to the obsolete LM385BZ-1.2 while achieving ROHS3 compliance. This part is recommended as the primary replacement for existing designs without modification.
Primary Alternatives (Equivalent Performance)
LM385BLP-1-2 and LM385BLPE3-1-2 from Texas Instruments provide equivalent 1.235V output with ±1% tolerance and improved temperature coefficient (20ppm/°C vs. 80ppm/°C). Both are ROHS3 compliant and suitable for direct substitution in 0°C to 70°C operating range applications.
Extended Temperature Range Options
LM285BXZ-1.2/NOPB and LM285Z-1.2#PBF support -40°C to 85°C operating range, enabling use in applications requiring broader temperature performance. Both maintain ±1% tolerance and ROHS3 compliance. LM285Z-1.2#PBF from Analog Devices offers the lowest temperature coefficient (20ppm/°C typical).
Tolerance Consideration
LM385LP-1-2 features ±2% tolerance instead of ±1%. This part is suitable only when circuit design margins accommodate the wider tolerance specification.
Compliance Status
All active substitute parts listed are ROHS3 compliant except LM385BYZ-1.2/NOPB. Selection should prioritize ROHS3-compliant alternatives for new designs and production environments with regulatory requirements.
Frequently Asked Questions (FAQ)
Q: Can LM385BZ-1.2 be directly replaced with LM385BZ-1.2G?
A: Yes. LM385BZ-1.2G is the active equivalent manufactured by onsemi with identical electrical specifications. The primary difference is ROHS3 compliance status. Direct substitution requires no circuit modifications.
Q: What is the difference between LM385 and LM285 series parts?
A: Both series provide 1.235V fixed shunt voltage references with identical output voltage and tolerance. LM285 variants typically offer extended temperature range (-40°C to 85°C) and lower cathode current requirements compared to LM385 parts. Selection depends on application temperature requirements and power budget constraints.
Q: Is LM385LP-1-2 compatible as a substitute despite ±2% tolerance?
A: LM385LP-1-2 is functionally compatible but features ±2% tolerance versus the original ±1%. Substitution is valid only when circuit design margins accommodate the wider tolerance band. Verify reference voltage accuracy requirements before selection.
Q: Which substitute offers the best temperature stability?
A: LM385BLP-1-2, LM385BLPE3-1-2, and LM285Z-1.2#PBF all feature 20ppm/°C typical temperature coefficient, providing superior stability compared to the original LM385BZ-1.2 at 80ppm/°C. These parts are recommended for applications requiring minimal voltage drift across temperature.
Q: Are all substitute parts ROHS3 compliant?
A: All listed substitutes are ROHS3 compliant except LM385BYZ-1.2/NOPB, which does not specify compliance status. For applications with regulatory requirements, select from the ROHS3-compliant alternatives.
Q: Can extended temperature range parts be used in standard 0°C to 70°C applications?
A: Yes. Extended temperature range parts (LM285 series, -40°C to 85°C) are fully compatible in standard operating ranges. They provide additional design margin for temperature-sensitive applications without performance degradation.
Q: What is the significance of cathode current differences?
A: Cathode current variations (10µA to 20µA) affect circuit power consumption and bias network design. Lower cathode current parts reduce power dissipation in battery-powered applications. Verify bias resistor values are compatible with selected cathode current specification.
Q: Which part has the highest inventory availability?
A: LM285Z-1.2/NOPB from Texas Instruments has the highest inventory at 72,762 pieces. LM385BLP-1-2 from Texas Instruments provides 20,023 pieces. Both are suitable for high-volume production requirements.
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