LMH6645MF Equivalent & Substitute Parts

Part Overview

The LMH6645MF is a voltage feedback operational amplifier manufactured by Texas Instruments, designed for single-circuit applications requiring push-pull, rail-to-rail output capability. The device is packaged in SOT-23-5 surface mount configuration and operates across a 2.5V to 12V supply voltage range with a -3dB bandwidth of 55 MHz.

The LMH6645MF carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements for applications currently utilizing this component.

Substiute Parts

LMH6645MF

Texas InstrumentsIn Stock: 6239LMH6645MF Datasheet

Current PartRFQ

LMH6645MF/NOPB

Texas InstrumentsIn Stock: 4073LMH6645MF/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LMH6645MF is determined by strict equivalence across the following critical parameters:

Electrical Performance Parameters:

• Amplifier topology (Voltage Feedback)
• Circuit count (1 circuit)
• Output configuration (Push-Pull, Rail-to-Rail)
• Slew rate (22 V/µs)
• Bandwidth (-3dB at 55 MHz)
• Input bias current (650 nA)
• Input offset voltage (1 mV)
• Supply current (725 µA)
• Output current per channel (20 mA)
• Supply voltage range (2.5V to 12V)
• Operating temperature range (-40°C to 85°C)

Physical and Packaging Parameters:

• Mounting type (Surface Mount)
• Package designation (SOT-23-5 / SC-74A / SOT-753)

The LMH6645MF/NOPB is identified as a direct substitute based on identical electrical specifications and package configuration. The primary distinction between the main part and its substitute is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

LMH6645MF/NOPB is the direct substitute for LMH6645MF. Selection of this substitute is based on the following engineering criteria:

Product Status Consideration: The LMH6645MF is classified as obsolete, while LMH6645MF/NOPB maintains active product status. Active status ensures continued manufacturer support, availability through authorized distribution channels, and compliance with current manufacturing standards.

Compliance and Certification: LMH6645MF/NOPB carries ROHS3 compliance certification, whereas the original LMH6645MF is RoHS non-compliant. For applications subject to RoHS regulatory requirements or customer specifications mandating RoHS compliance, LMH6645MF/NOPB is the appropriate selection.

Electrical and Physical Equivalence: All electrical parameters, operating characteristics, and physical package specifications are identical between the two parts. Pin-for-pin compatibility and functional equivalence are confirmed across all provided specifications.

Packaging Format: LMH6645MF/NOPB is supplied in Cut Tape (CT) and Digi-Reel® packaging formats, supporting both manual assembly and automated reel-fed production processes.

Frequently Asked Questions (FAQ)

Q: Can LMH6645MF/NOPB be used as a direct replacement for LMH6645MF in existing designs?

A: Yes. LMH6645MF/NOPB is electrically and mechanically equivalent to LMH6645MF. All electrical parameters, including slew rate, bandwidth, bias current, offset voltage, supply current, output current, supply voltage range, and operating temperature specifications are identical. The SOT-23-5 package configuration is unchanged, ensuring pin-for-pin compatibility.

Q: What is the primary difference between LMH6645MF and LMH6645MF/NOPB?

A: The primary differences are product status and compliance certification. LMH6645MF is obsolete and RoHS non-compliant, while LMH6645MF/NOPB is active and ROHS3 compliant. Both parts are manufactured by Texas Instruments and share identical electrical and physical specifications.

Q: Are there any performance differences between these parts?

A: No. Both parts deliver identical performance across all specified electrical parameters: 22 V/µs slew rate, 55 MHz bandwidth, 650 nA input bias current, 1 mV input offset voltage, 725 µA supply current, and 20 mA output current per channel.

Q: What packaging options are available for LMH6645MF/NOPB?

A: LMH6645MF/NOPB is supplied in Cut Tape (CT) and Digi-Reel® formats. Both formats use the SOT-23-5 package configuration. Cut Tape is suitable for manual assembly and small-volume applications, while Digi-Reel® format supports automated pick-and-place assembly processes.

Q: Is LMH6645MF/NOPB suitable for applications requiring RoHS compliance?

A: Yes. LMH6645MF/NOPB carries ROHS3 compliance certification and is suitable for applications subject to RoHS regulatory requirements or customer specifications mandating RoHS compliance.

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

A: Both LMH6645MF and LMH6645MF/NOPB operate across a supply voltage range of 2.5V to 12V, supporting single-supply and dual-supply configurations within this range.

Q: Are these parts suitable for low-temperature applications?

A: Yes. Both parts are rated for operation across the temperature range of -40°C to 85°C, supporting industrial and extended-temperature applications.