LOG104AIDR Equivalent & Substitute Parts Reference

Part Overview

The LOG104AIDR is a logarithmic and log ratio amplifier integrated circuit manufactured by Texas Instruments in an 8-SOIC surface mount package. This device is classified as obsolete, indicating it is no longer in active production. The LOG104AIDR provides single-circuit logarithmic amplification functionality with specified electrical characteristics suitable for precision signal conditioning applications.

Due to its obsolete status, identifying equivalent substitute parts is necessary for design continuity, procurement planning, and system maintenance. Active equivalent models from the same manufacturer family maintain identical functional and electrical specifications while offering current availability and ongoing support.

Substiute Parts

LOG104AIDR

Texas InstrumentsIn Stock: 2955LOG104AIDR Datasheet

Current PartRFQ

LOG104AID

Texas InstrumentsIn Stock: 1520LOG104AID Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LOG104AIDR is determined by strict equivalence across all specified electrical and mechanical parameters. The substitute part LOG104AID maintains identical functional characteristics across all critical parameters that define the logarithmic amplifier circuit behavior and physical compatibility.

The substitution logic is based on the following key parameters:

• Amplifier Type: Both parts are logarithmic and log ratio amplifiers with single circuit configuration
• Electrical Specifications: Slew rate, bandwidth, input bias current, input offset voltage, and supply current are identical
• Supply Voltage Range: Both operate across 9V to 36V supply span
• Operating Temperature: Identical temperature range of -5°C to 75°C
• Package Configuration: Both use 8-SOIC surface mount package with identical physical dimensions
• Compliance Standards: Both are ROHS3 compliant with identical moisture sensitivity level

The primary distinction between the main part and substitute is product status (obsolete versus active) and packaging format (tape/reel versus tube). These differences do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The LOG104AID is a direct functional equivalent to the LOG104AIDR. Selection of the substitute part is supported by the following engineering criteria:

Compliance and Certification: Both parts maintain ROHS3 compliance and identical moisture sensitivity specifications, ensuring regulatory and environmental compatibility across applications.

Product Status: The LOG104AID is classified as active product status, providing access to current manufacturing, quality assurance, and supply chain support. The LOG104AIDR, being obsolete, presents long-term availability risk and lacks ongoing manufacturer support.

Electrical and Mechanical Equivalence: All specified electrical parameters, supply voltage requirements, operating temperature range, and physical package dimensions are identical between the two parts. This equivalence ensures direct substitution without circuit redesign or PCB layout modification.

Availability: The LOG104AID maintains current inventory (1421 pieces) compared to the LOG104AIDR's limited obsolete stock (2902 pieces). For new designs or system maintenance requiring long-term component availability, the LOG104AID is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Can LOG104AID be used as a direct replacement for LOG104AIDR in existing designs?

A: Yes. The LOG104AID is electrically and mechanically equivalent to the LOG104AIDR across all specified parameters. No circuit modifications or PCB layout changes are required for substitution.

Q: What is the difference between LOG104AIDR and LOG104AID?

A: The primary differences are product status (obsolete versus active) and packaging format (tape/reel versus tube). All electrical specifications, performance characteristics, and physical package dimensions are identical.

Q: Are there any compatibility concerns with the 8-SOIC package?

A: No. Both parts use identical 8-SOIC surface mount packages with 0.154" width and 3.90mm dimensions. PCB footprints and assembly processes are fully compatible.

Q: Does the LOG104AID meet the same compliance standards as the LOG104AIDR?

A: Yes. Both parts are ROHS3 compliant with identical moisture sensitivity level (MSL 3, 168 hours). Regulatory and environmental requirements are equivalent.

Q: Why is the LOG104AIDR classified as obsolete?

A: The LOG104AIDR has been discontinued by Texas Instruments. The LOG104AID represents the active equivalent in the product family and is the recommended selection for current and future applications.

Q: What is the supply voltage operating range for these parts?

A: Both the LOG104AIDR and LOG104AID operate across a supply voltage span of 9V minimum to 36V maximum, providing flexibility for various power supply configurations.

Q: Are the input bias current and input offset voltage specifications identical?

A: Yes. Both parts specify 5 pA input bias current and 300 µV input offset voltage, ensuring equivalent precision characteristics for logarithmic signal conditioning applications.