LOG104AIDRG4 Equivalent & Substitute Parts Reference

Part Overview

The LOG104AIDRG4 is a logarithmic and log ratio amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, indicating it is no longer in active production. The LOG104AIDRG4 operates across a wide supply voltage range of 9V to 36V and delivers logarithmic signal processing with a -3dB bandwidth of 45 kHz, making it suitable for precision measurement and signal conditioning applications requiring logarithmic transfer characteristics.

Due to its obsolete status, identifying equivalent substitute parts is essential for design continuity, system maintenance, and procurement planning. Active alternatives with identical electrical and mechanical specifications ensure seamless integration into existing designs without circuit modification.

Substiute Parts

LOG104AIDRG4

Texas InstrumentsIn Stock: 939LOG104AIDRG4 Datasheet

Current PartRFQ

LOG104AID

Texas InstrumentsIn Stock: 1520LOG104AID Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LOG104AIDRG4 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Amplifier type: Logarithmic and log ratio function
• Number of circuits: Single circuit configuration
• Slew rate: 0.5 V/µs
• -3dB bandwidth: 45 kHz
• Input bias current: 5 pA
• Input offset voltage: 300 µV
• Supply current: 1 mA
• Supply voltage range: 9V to 36V
• Operating temperature range: -5°C to 75°C

Mechanical Equivalence Criteria:

• Package type: 8-SOIC surface mount
• Package dimensions: 0.154" width (3.90mm)
• Mounting technology: Surface mount compatible

Compliance Equivalence Criteria:

• RoHS3 compliance
• Moisture sensitivity level: MSL 3
• REACH unaffected status

The LOG104AID substitute part maintains identical electrical performance and mechanical compatibility while offering active product status and improved inventory availability.

Parameter Comparison

Engineering Selection Recommendations

The LOG104AID is a direct functional and mechanical equivalent to the LOG104AIDRG4. Selection of the LOG104AID substitute is justified on the following engineering grounds:

Product Status Advantage: The LOG104AID maintains active product status with Texas Instruments, ensuring continued availability, technical support, and compliance with current manufacturing standards. The LOG104AIDRG4 is obsolete and subject to supply discontinuation.

Electrical Equivalence: All critical electrical parameters—slew rate, bandwidth, input bias current, input offset voltage, supply current, and supply voltage range—are identical between the main part and substitute. Circuit performance remains unchanged.

Mechanical Compatibility: Both parts utilize the 8-SOIC surface mount package with identical dimensions (0.154" width, 3.90mm). PCB footprints and assembly processes require no modification.

Compliance Alignment: Both parts maintain ROHS3 compliance, identical moisture sensitivity levels (MSL 3), and REACH unaffected status, ensuring regulatory and environmental requirements are met.

Packaging Consideration: The LOG104AID is supplied in tube packaging rather than tape & reel format. This difference affects procurement and assembly line integration but does not impact electrical or mechanical performance. Tube packaging is compatible with standard component handling and placement equipment.

Frequently Asked Questions (FAQ)

Q: Can LOG104AID replace LOG104AIDRG4 in existing designs without circuit modification?

A: Yes. The LOG104AID is electrically and mechanically identical to the LOG104AIDRG4. All electrical parameters, supply voltage range, operating temperature range, and package dimensions are equivalent. Direct substitution on PCBs designed for the LOG104AIDRG4 is possible without schematic or layout changes.

Q: What is the difference between LOG104AIDRG4 and LOG104AID?

A: The primary differences are product status and packaging format. The LOG104AIDRG4 is obsolete and supplied in tape & reel format. The LOG104AID is an active product supplied in tube packaging. All electrical and mechanical specifications are identical.

Q: Is the 8-SOIC package footprint identical between both parts?

A: Yes. Both the LOG104AIDRG4 and LOG104AID use the 8-SOIC package with dimensions of 0.154" width (3.90mm). PCB footprints are identical, and no layout modifications are required.

Q: Does tube packaging affect assembly compatibility?

A: Tube packaging is compatible with standard surface mount assembly equipment. The difference from tape & reel format affects component feeding and handling during production but does not impact electrical performance or final assembly quality.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the LOG104AIDRG4 and LOG104AID are ROHS3 compliant with identical moisture sensitivity levels (MSL 3, 168 hours). Regulatory and environmental requirements are met by both parts.

Q: Why is the LOG104AIDRG4 marked as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Texas Instruments. The LOG104AID is the active equivalent and should be used for new designs and component replenishment.

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

A: Both parts operate across a supply voltage range of 9V to 36V, providing flexibility for various power supply configurations in logarithmic amplifier applications.