LOG102AIDR Equivalent & Substitute Parts

Part Overview

The LOG102AIDR is a logarithmic and log ratio amplifier integrated circuit manufactured by Texas Instruments in a 14-SOIC surface mount package. This device is classified as obsolete, indicating it has been discontinued and is no longer in active production. The LOG102AIDR was designed for applications requiring logarithmic signal processing and ratio measurement functions with single-circuit configuration.

Due to its obsolete status, sourcing new units from primary distribution channels is limited. Identifying equivalent substitute parts ensures design continuity and maintains access to functionally compatible alternatives that meet the same electrical and mechanical specifications.

Substiute Parts

LOG102AIDR

Texas InstrumentsIn Stock: 1665LOG102AIDR Datasheet

Current PartRFQ

LOG112AIDR

Texas InstrumentsIn Stock: 1538LOG112AIDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LOG102AIDR is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Amplifier Type: Logarithmic and Log Ratio
• Number of Circuits: 1
• Slew Rate: 0.5 V/µs
• Gain Bandwidth Product: 1.4 MHz
• -3dB Bandwidth: 45 kHz
• Current - Input Bias: 5 pA
• Voltage - Input Offset: 300 µV
• Current - Supply: 1.25 mA
• Voltage - Supply Span: 9 V to 36 V

Mechanical Equivalence Criteria:

• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

Compliance Equivalence Criteria:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 3 (168 Hours)

The LOG112AIDR meets all electrical and mechanical equivalence criteria and is classified as an active product, providing improved long-term availability compared to the obsolete LOG102AIDR.

Parameter Comparison

Engineering Selection Recommendations

The LOG112AIDR is the direct substitute for the LOG102AIDR based on complete electrical and mechanical parameter equivalence. Both devices are ROHS3 compliant and share identical MSL ratings, ensuring compatibility in regulated manufacturing environments.

The LOG112AIDR offers the additional advantage of active product status, providing superior long-term availability and supply chain reliability. The extended operating temperature range (-5°C to 75°C versus 0°C to 70°C) of the LOG112AIDR provides broader environmental operating capability without compromising any core electrical specifications.

Both parts are manufactured by Texas Instruments in the 14-SOIC surface mount package, ensuring pin-for-pin compatibility and identical PCB footprint requirements. No circuit redesign or layout modifications are necessary when transitioning from LOG102AIDR to LOG112AIDR.

Frequently Asked Questions (FAQ)

Q: Are LOG102AIDR and LOG112AIDR pin-for-pin compatible?

A: Yes. Both devices use the 14-SOIC package with identical pinout and electrical characteristics. Direct substitution on existing PCBs is possible without layout modifications.

Q: What is the primary difference between LOG102AIDR and LOG112AIDR?

A: The LOG102AIDR is obsolete, while the LOG112AIDR is an active product. The LOG112AIDR also features an extended operating temperature range (-5°C to 75°C compared to 0°C to 70°C). All electrical specifications are identical.

Q: Can I use LOG112AIDR in applications originally designed for LOG102AIDR?

A: Yes. The LOG112AIDR meets all electrical and mechanical specifications of the LOG102AIDR. The extended temperature range provides additional operational flexibility.

Q: Are both parts RoHS compliant?

A: Yes. Both LOG102AIDR and LOG112AIDR are ROHS3 compliant with identical MSL ratings of 3 (168 Hours).

Q: What is the supply voltage range for these devices?

A: Both devices operate with a supply voltage span of 9 V to 36 V, providing flexibility in power supply design.

Q: Are there any circuit modifications required when substituting LOG102AIDR with LOG112AIDR?

A: No circuit modifications are required. The devices are electrically equivalent with identical gain bandwidth product, slew rate, input bias current, and input offset voltage specifications.