LMH6640MF/NOPB Equivalent & Substitute Parts

Part Overview

The LMH6640MF/NOPB is a voltage feedback operational amplifier manufactured by Texas Instruments, housed in a SOT-23-5 surface mount package. This device is classified as obsolete, necessitating identification of equivalent and substitute components for new designs and production continuity. The LMH6640MF/NOPB delivers rail-to-rail output capability with a slew rate of 170V/µs and gain bandwidth product of 62 MHz, making it suitable for high-speed signal conditioning applications. Due to its obsolete status, alternative parts with compatible electrical and mechanical specifications are required for ongoing system support and new implementations.

Substiute Parts

LMH6640MF/NOPB

Texas InstrumentsIn Stock: 725LMH6640MF/NOPB Datasheet

Current PartRFQ

LMH6642MF/NOPB

Texas InstrumentsIn Stock: 38368LMH6642MF/NOPB Datasheet

DirectRFQ

MCP6H01T-E/OT

Microchip TechnologyIn Stock: 2081MCP6H01T-E/OT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LMH6640MF/NOPB is determined by the following critical parameters: package compatibility (SOT-23-5), output type (rail-to-rail), number of circuits (single), mounting type (surface mount), and operating temperature range (-40°C to 85°C minimum). The substitute parts identified fall into two categories based on functional alignment:

Category 1: Direct Voltage Feedback Substitutes — Parts maintaining voltage feedback amplifier topology with comparable slew rate, bandwidth, and output current specifications. These parts preserve the high-speed characteristics of the original design.

Category 2: General Purpose Substitutes — Parts offering rail-to-rail output in identical packaging with lower bandwidth and slew rate characteristics, suitable for applications where the full performance envelope of the LMH6640MF/NOPB is not required.

All substitute candidates share the following mandatory compatibility criteria: SOT-23-5 package, single-circuit configuration, rail-to-rail output, surface mount technology, and RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

LMH6642MF/NOPB is the primary substitute for the LMH6640MF/NOPB. Both devices are manufactured by Texas Instruments, share identical package specifications (SOT-23-5), and maintain voltage feedback amplifier topology. The LMH6642MF/NOPB is currently in active production status, ensuring long-term availability and supply chain continuity. While the LMH6642MF/NOPB exhibits reduced slew rate (135V/µs versus 170V/µs) and lower -3dB bandwidth (130 MHz versus 190 MHz), it remains suitable for applications where these performance reductions are acceptable. The LMH6642MF/NOPB demonstrates improved power efficiency with lower supply current (2.7 mA versus 4 mA) and reduced output current capability (75 mA versus 100 mA). Supply voltage range compatibility is maintained within the 4.5V to 12.8V overlap region. Both parts comply with RoHS3 and REACH requirements.

MCP6H01T-E/OT is a secondary substitute manufactured by Microchip Technology. This device provides identical package compatibility and rail-to-rail output capability. The MCP6H01T-E/OT is classified as general purpose rather than voltage feedback, resulting in significantly lower bandwidth (1.2 MHz gain bandwidth product) and slew rate (0.8V/µs). This part is appropriate only for low-frequency signal conditioning applications where the performance envelope of the LMH6640MF/NOPB is not required. The MCP6H01T-E/OT offers superior input bias current characteristics (10 pA) and extended operating temperature range (-40°C to 125°C). This device is currently in active production status and complies with RoHS3 and REACH requirements.

Frequently Asked Questions (FAQ)

Q: Can the LMH6642MF/NOPB directly replace the LMH6640MF/NOPB in existing designs?

A: The LMH6642MF/NOPB shares identical package, pinout, and supply voltage compatibility with the LMH6640MF/NOPB. However, the reduced slew rate (135V/µs versus 170V/µs) and -3dB bandwidth (130 MHz versus 190 MHz) must be evaluated against circuit performance requirements. Applications operating at frequencies below 130 MHz with slew rate demands below 135V/µs can accommodate this substitution without circuit modification.

Q: What are the key differences between the LMH6642MF/NOPB and MCP6H01T-E/OT?

A: Both devices are packaged in SOT-23-5 with rail-to-rail output. The LMH6642MF/NOPB maintains voltage feedback topology with 130 MHz bandwidth and 135V/µs slew rate. The MCP6H01T-E/OT is a general purpose amplifier with 1.2 MHz bandwidth and 0.8V/µs slew rate. The LMH6642MF/NOPB is appropriate for high-speed applications, while the MCP6H01T-E/OT is suitable for low-frequency signal conditioning.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The LMH6642MF/NOPB and MCP6H01T-E/OT are both RoHS3 compliant, matching the compliance status of the LMH6640MF/NOPB.

Q: What is the supply voltage compatibility range for substitution?

A: The LMH6640MF/NOPB operates from 4.5V to 16V. The LMH6642MF/NOPB operates from 2.7V to 12.8V, providing overlap from 4.5V to 12.8V. The MCP6H01T-E/OT operates from 3.5V to 16V, providing overlap from 4.5V to 16V. Circuit supply voltage must fall within the overlapping range of the original and substitute part.

Q: Does the MCP6H01T-E/OT support the same operating temperature range?

A: The LMH6640MF/NOPB and LMH6642MF/NOPB operate from -40°C to 85°C. The MCP6H01T-E/OT extends this range to -40°C to 125°C, providing broader temperature coverage. Applications requiring operation above 85°C can utilize the MCP6H01T-E/OT if bandwidth and slew rate requirements are met.

Q: Are there packaging or mounting differences between these parts?

A: All three parts utilize identical SOT-23-5 packaging (SC-74A, SOT-753) with surface mount technology. No PCB layout or assembly process modifications are required for substitution.

Q: What inventory status should influence substitution decisions?

A: The LMH6642MF/NOPB is in active production with 38,300 units in stock, ensuring reliable long-term supply. The MCP6H01T-E/OT is in active production with 2,060 units in stock. Both parts provide superior supply chain continuity compared to the obsolete LMH6640MF/NOPB.