LM311DR2 Equivalent & Substitute Parts

Part Overview

The LM311DR2 is a single-channel comparator IC manufactured by onsemi, housed in an 8-SOIC surface mount package. This device is classified as a linear integrated circuit designed for voltage comparison applications across a wide supply voltage range. The LM311DR2 is currently listed as obsolete, which necessitates identification of functionally equivalent active alternatives for new designs and ongoing production requirements. The substitute part LM311DR2G provides direct functional equivalence while maintaining active product status and improved compliance certifications.

Substiute Parts

LM311DR2

onsemiIn Stock: 2985LM311DR2 Datasheet

Current PartRFQ

LM311DR2G

onsemiIn Stock: 516974LM311DR2G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The LM311DR2G qualifies as a direct substitute based on the following alignment criteria:

Shared Electrical Characteristics:

• Single-channel comparator architecture
• 8-SOIC package form factor
• Common base product number (LM311)
• Identical supply voltage range (5V ~ 30V, ±2.5V ~ 15V)
• Matching input offset voltage specification (7.5mV @ ±15V)
• Identical input bias current specification (0.25µA @ ±15V)
• Identical quiescent current specification (7.5mA maximum)
• Matching operating temperature range (0°C ~ 70°C)

Mechanical Compatibility:

• Identical package designation: 8-SOIC (0.154", 3.90mm Width)
• Surface mount mounting type
• Pin-for-pin compatible footprint

Regulatory & Compliance Alignment:

• REACH Unaffected status maintained
• ECCN EAR99 classification consistent
• HTSUS code 8542.39.0001 identical

The substitution is valid for applications requiring general-purpose comparator functionality with DTL, MOS, open-collector, open-emitter, RTL, and TTL output compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LM311DR2G

The LM311DR2G is the direct functional equivalent for the obsolete LM311DR2. Selection of LM311DR2G is justified on the following grounds:

• Product Status: LM311DR2G maintains active product status, ensuring long-term availability and supply chain continuity, whereas LM311DR2 is obsolete.
• Electrical Equivalence: All critical electrical parameters are identical, including supply voltage range, input offset voltage, input bias current, and quiescent current specifications.
• Package Compatibility: Both devices utilize the 8-SOIC surface mount package with identical footprint dimensions, enabling direct PCB layout compatibility without redesign.
• Compliance Enhancement: LM311DR2G achieves ROHS3 compliance, addressing regulatory requirements for new product designs and manufacturing in restricted substance environments.
• Regulatory Alignment: Both parts maintain identical REACH Unaffected status, ECCN EAR99 classification, and HTSUS code 8542.39.0001, ensuring consistent export and import compliance.
• Moisture Sensitivity: Both devices share MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints during storage and handling.

For applications currently using LM311DR2, direct substitution with LM311DR2G requires no circuit modifications, PCB layout changes, or firmware adjustments.

Frequently Asked Questions (FAQ)

Q: Can LM311DR2G be used as a direct replacement for LM311DR2 without circuit modifications?

A: Yes. LM311DR2G is pin-for-pin compatible with identical electrical specifications across all critical parameters including supply voltage range, input offset voltage, input bias current, and quiescent current. No circuit redesign is required.

Q: What is the primary reason for substituting LM311DR2 with LM311DR2G?

A: LM311DR2 is classified as obsolete, creating supply chain risk. LM311DR2G is an active product from the same manufacturer with identical electrical and mechanical specifications, ensuring continued availability and long-term support.

Q: Are there packaging differences between LM311DR2 and LM311DR2G?

A: No. Both devices are housed in the 8-SOIC surface mount package with identical dimensions (0.154" × 3.90mm width). PCB footprints are identical, and no layout modifications are necessary.

Q: Does LM311DR2G meet RoHS compliance requirements?

A: Yes. LM311DR2G is ROHS3 compliant, whereas LM311DR2 is RoHS non-compliant. This represents an improvement in regulatory compliance for new designs and manufacturing environments with RoHS restrictions.

Q: Are the electrical performance characteristics identical between LM311DR2 and LM311DR2G?

A: Yes. Both devices share identical specifications for supply voltage range (5V ~ 30V, ±2.5V ~ 15V), input offset voltage (7.5mV @ ±15V), input bias current (0.25µA @ ±15V), quiescent current (7.5mA maximum), and operating temperature range (0°C ~ 70°C).

Q: What is the output type configuration for LM311DR2G?

A: LM311DR2G supports multiple output types: DTL, MOS, open-collector, open-emitter, RTL, and TTL. This provides flexibility for interfacing with various logic families and circuit topologies.

Q: Are there any moisture sensitivity or handling constraints for LM311DR2G?

A: No. LM311DR2G carries MSL 1 (Unlimited) rating, indicating no moisture sensitivity limitations. Standard handling procedures for surface mount components apply.

Q: What is the current availability status for LM311DR2G?

A: LM311DR2G is an active product with substantial inventory availability (516,900 pcs reported in stock), ensuring reliable supply for production requirements.