LM6142AIN Equivalent & Substitute Parts

Part Overview

The LM6142AIN is a general-purpose operational amplifier featuring dual circuits in a through-hole 8-DIP package. This device delivers rail-to-rail output capability with a slew rate of 25V/µs and a gain bandwidth product of 18 MHz, suitable for analog signal conditioning and general amplification applications across industrial and consumer electronics.

The LM6142AIN is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for legacy systems or new designs requiring compatible performance characteristics.

Substiute Parts

LM6142AIN

Texas InstrumentsIn Stock: 5841LM6142AIN Datasheet

Current PartRFQ

LMH6643MA/NOPB

Texas InstrumentsIn Stock: 1947LMH6643MA/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM6142AIN is determined by the following critical parameters:

Functional Requirements:

• Dual-circuit operational amplifier configuration
• Rail-to-rail output capability
• General-purpose amplification topology

Electrical Performance Boundaries:

• Slew rate: minimum 25V/µs
• Gain bandwidth product: minimum 18 MHz
• Input bias current: maximum 174 nA
• Input offset voltage: maximum 1.3 mV
• Output current per channel: minimum 24 mA
• Supply voltage range: 1.8V to 24V minimum span

Physical & Environmental Constraints:

• Operating temperature range: -40°C to 85°C
• RoHS3 compliance required
• Moisture sensitivity level 1 (unlimited)

The LMH6643MA/NOPB qualifies as a substitute based on superior performance across all critical parameters while maintaining functional compatibility through dual-circuit configuration, rail-to-rail output, and overlapping supply voltage specifications. The substitute operates within the required temperature range and meets all compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

LMH6643MA/NOPB Substitution Suitability:

The LMH6643MA/NOPB is a direct functional substitute for the LM6142AIN based on the following engineering criteria:

Performance Enhancement: The substitute exceeds all minimum electrical performance requirements. Slew rate increases from 25V/µs to 135V/µs, and bandwidth extends from 18 MHz to 130 MHz, providing superior transient response and frequency performance for signal conditioning applications.

Output Current Capability: Output current per channel increases from 24 mA to 75 mA, enabling the substitute to drive higher impedance loads and support more demanding output stages.

Compliance & Reliability: Both devices maintain ROHS3 compliance and moisture sensitivity level 1 (unlimited), ensuring equivalent environmental robustness and regulatory alignment. Both operate across the -40°C to 85°C temperature range required for industrial applications.

Supply Voltage Consideration: The substitute operates within a narrower maximum supply voltage range (12.8V versus 24V). Applications requiring supply voltages exceeding 12.8V require circuit redesign or alternative component selection.

Mounting Architecture Change: The substitute transitions from through-hole 8-DIP to surface-mount 8-SOIC packaging. PCB layout and assembly process modifications are required. Adapter solutions or board redesign may be necessary for legacy through-hole implementations.

Product Status Advantage: The LMH6643MA/NOPB maintains active product status, ensuring long-term availability, ongoing manufacturing support, and supply chain continuity compared to the obsolete LM6142AIN.

Frequently Asked Questions (FAQ)

Q: Can the LMH6643MA/NOPB directly replace the LM6142AIN in existing PCB designs?

A: Functional substitution is possible; however, physical substitution requires modification. The LMH6643MA/NOPB uses 8-SOIC surface-mount packaging versus the LM6142AIN's 8-DIP through-hole package. PCB layout redesign or adapter solutions are necessary. Pin-to-pin electrical compatibility exists for the dual-circuit configuration and rail-to-rail output topology.

Q: What is the impact of the reduced maximum supply voltage (12.8V versus 24V) on substitution?

A: Applications operating at supply voltages between 12.8V and 24V cannot use the LMH6643MA/NOPB without circuit modification. Designs operating within the 2.7V to 12.8V range experience no supply voltage limitation. Verify actual operating supply voltage before component selection.

Q: Does the higher input bias current of the LMH6643MA/NOPB (1.6 µA versus 174 nA) affect circuit performance?

A: The 9-fold increase in input bias current may impact high-impedance input circuits, transimpedance amplifier configurations, and precision measurement applications. Low-impedance signal sources and standard amplification circuits experience negligible performance degradation. Input impedance and source resistance must be evaluated for sensitive applications.

Q: Are there thermal or power consumption differences between these devices?

A: The LMH6643MA/NOPB draws 2.7 mA per channel versus 750 µA per channel for the LM6142AIN, representing a 3.6-fold increase in quiescent current. Total power dissipation increases proportionally. Thermal management and power supply capacity must be reassessed during substitution.

Q: What certifications and compliance standards apply to both devices?

A: Both the LM6142AIN and LMH6643MA/NOPB are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8542.33.0001. Moisture sensitivity level 1 (unlimited) applies to both devices, indicating no moisture-related handling restrictions during storage or assembly.

Q: Is the LMH6643MA/NOPB the only available substitute for the LM6142AIN?

A: The LMH6643MA/NOPB is the manufacturer-recommended substitute provided by Texas Instruments. The substitute part list indicates additional alternatives exist (MAX4017ESA+, TSH82IDT, MAX4217ESA+); however, detailed parameter specifications for these alternatives are not provided in this reference. Consult manufacturer datasheets for complete compatibility assessment.