LM385MX-1.2 Equivalent & Substitute Parts

Part Overview

The LM385MX-1.2 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 1.235V output with ±2.43%/+2.02% tolerance. This component operates as a micropower voltage reference suitable for precision analog applications requiring stable reference voltages in 8-SOIC surface mount packaging. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives from both Texas Instruments and onsemi provide functional equivalence with improved product status and compliance certifications.

Substiute Parts

LM385MX-1.2

Texas InstrumentsIn Stock: 19028LM385MX-1.2 Datasheet

Current PartRFQ

LM385MX-2.5/NOPB

National SemiconductorIn Stock: 59695LM385MX-2.5/NOPB Datasheet

DirectRFQ

LM385MX-1.2/NOPB

Texas InstrumentsIn Stock: 27804LM385MX-1.2/NOPB Datasheet

Parametric EquivalentRFQ

LM385BD-1.2G

onsemiIn Stock: 5255LM385BD-1.2G Datasheet

MFR RecommendedRFQ

LM385BD-1.2R2G

onsemiIn Stock: 2160LM385BD-1.2R2G Datasheet

MFR RecommendedRFQ

LM385D-1.2G

onsemiIn Stock: 3245LM385D-1.2G Datasheet

MFR RecommendedRFQ

LM385D-1.2R2G

onsemiIn Stock: 21624LM385D-1.2R2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM385MX-1.2 are classified based on the following substitution criteria:

Parametric Equivalent: Parts maintaining identical electrical specifications including 1.235V fixed output voltage, 20 mA output current, 150ppm/°C temperature coefficient, and 8-SOIC packaging. These parts differ only in packaging format (Tape & Reel vs. bulk) or manufacturer while preserving core electrical performance.

Direct Manufacturer Substitute: Parts with different output voltage (2.5V) but identical package, mounting type, and reference architecture. These are suitable only when circuit design accommodates the higher reference voltage.

Manufacturer Recommended Substitute: Parts from onsemi offering improved tolerance specifications (±1% vs. ±2.43%/+2.02%), lower temperature coefficient (80ppm/°C typical vs. 150ppm/°C), and active product status with RoHS3 compliance. These maintain 1.235V output voltage and 8-SOIC packaging while providing enhanced performance characteristics.

Key parameters determining substitutability:

• Output voltage (1.235V primary requirement)
• Package type (8-SOIC mandatory)
• Output current capability (20 mA)
• Operating temperature range (0°C to 70°C)
• Mounting type (Surface Mount)

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LM385MX-1.2/NOPB (Texas Instruments, Tape & Reel) provides direct parametric equivalence to the obsolete LM385MX-1.2 with active product status and RoHS3 compliance. This part maintains identical electrical specifications while offering improved supply chain availability and regulatory compliance.

Performance-Enhanced Alternative: LM385BD-1.2R2G or LM385BD-1.2G (onsemi) offer superior tolerance (±1% vs. -2.43%/+2.02%) and lower temperature coefficient (80ppm/°C typical vs. 150ppm/°C), delivering improved voltage stability across temperature variations. Both variants maintain 1.235V output and 8-SOIC packaging with active product status and RoHS3 compliance. Selection between Tape & Reel (R2G) and Tube (G) packaging depends on production volume and handling requirements.

Tolerance-Matched Alternative: LM385D-1.2R2G or LM385D-1.2G (onsemi) provide tolerance specifications closely matching the original part (-2.4%/+2.01% vs. -2.43%/+2.02%) with improved temperature coefficient performance and active product status. These parts are suitable for designs requiring tolerance compatibility with the original specification.

Voltage-Different Substitute: LM385MX-2.5/NOPB (National Semiconductor) is applicable only when circuit design accommodates 2.5V reference voltage. This part shares identical package and mounting characteristics but requires circuit-level validation due to voltage difference.

Frequently Asked Questions (FAQ)

Q: Can LM385MX-1.2/NOPB directly replace the obsolete LM385MX-1.2?

A: Yes. LM385MX-1.2/NOPB is a parametric equivalent with identical electrical specifications (1.235V output, 20 mA current, 150ppm/°C temperature coefficient, 60µVrms noise). The primary difference is packaging format (Tape & Reel vs. bulk) and improved RoHS3 compliance status. Pin configuration and 8-SOIC package dimensions are identical.

Q: What are the advantages of onsemi LM385BD-1.2R2G over the original LM385MX-1.2?

A: The LM385BD-1.2R2G offers tighter voltage tolerance (±1% vs. -2.43%/+2.02%), lower temperature coefficient (80ppm/°C typical vs. 150ppm/°C), and active product status with RoHS3 compliance. These improvements provide enhanced voltage stability and regulatory compliance while maintaining identical 1.235V output and 8-SOIC packaging.

Q: Are onsemi LM385D and LM385BD series interchangeable?

A: Both series maintain 1.235V output voltage and 8-SOIC packaging. LM385BD-1.2 offers ±1% tolerance, while LM385D-1.2 offers -2.4%/+2.01% tolerance. Both feature 80ppm/°C typical temperature coefficient and are suitable for direct substitution based on tolerance requirements. Selection depends on circuit tolerance specifications.

Q: Can LM385MX-2.5/NOPB be used as a substitute?

A: LM385MX-2.5/NOPB is not a direct substitute due to different output voltage (2.5V vs. 1.235V). This part is applicable only when circuit design is modified to accommodate the higher reference voltage. Package and mounting characteristics are identical, but voltage-dependent circuit elements require redesign.

Q: What packaging options are available for active LM385-1.2 variants?

A: Active variants are available in Tape & Reel (TR) and Tube packaging formats. Tape & Reel packaging (designated R2G suffix) is standard for automated assembly and high-volume production. Tube packaging (designated G suffix) is suitable for lower-volume applications and manual assembly. Both formats maintain identical electrical specifications and 8-SOIC package dimensions.

Q: Are all substitute parts RoHS3 compliant?

A: The original LM385MX-1.2 is RoHS non-compliant. All active substitute parts listed (LM385MX-1.2/NOPB, LM385BD-1.2 series, and LM385D-1.2 series) are RoHS3 compliant. LM385MX-2.5/NOPB RoHS status is not specified in available documentation.