LMH6551MM Equivalent & Substitute Parts

Part Overview

The LMH6551MM is a voltage feedback operational amplifier manufactured by Texas Instruments, designed for high-speed signal conditioning applications. This device integrates one differential output circuit in an 8-VSSOP surface mount package and delivers a slew rate of 2400V/µs with a -3dB bandwidth of 370 MHz.

The LMH6551MM is classified as Last Time Buy, indicating that Texas Instruments has discontinued this part number. Direct substitutes with Active product status are available to ensure design continuity and supply chain reliability. Equivalent parts maintain identical electrical specifications and package compatibility, enabling seamless integration into existing designs.

Substiute Parts

LMH6551MM

Texas InstrumentsIn Stock: 1272LMH6551MM Datasheet

Current PartRFQ

LMH6551MM/NOPB

Texas InstrumentsIn Stock: 15293LMH6551MM/NOPB Datasheet

DirectRFQ

LMH6551MMX/NOPB

Texas InstrumentsIn Stock: 8519LMH6551MMX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LMH6551MM is determined by strict equivalence across all electrical and mechanical parameters. The following criteria establish valid substitutes:

Electrical Parameter Equivalence:

• Amplifier Type: Voltage Feedback
• Number of Circuits: 1
• Output Type: Differential
• Slew Rate: 2400 V/µs
• -3dB Bandwidth: 370 MHz
• Current - Input Bias: 4 µA
• Voltage - Input Offset: 500 µV
• Current - Supply: 12.5 mA
• Current - Output / Channel: 65 mA
• Voltage - Supply Span: 3 V to 12 V
• Operating Temperature Range: -40°C to 125°C

Mechanical & Compliance Equivalence:

• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Supplier Device Package: 8-VSSOP
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed maintain identical specifications across these parameters, ensuring direct functional and physical compatibility.

Parameter Comparison

Engineering Selection Recommendations

LMH6551MM/NOPB is the primary direct substitute for the LMH6551MM. This part number carries Active product status from Texas Instruments, ensuring long-term availability and supply chain stability. The /NOPB suffix indicates lead-free plating compliance. With 15,200 units in stock, this variant provides the highest inventory availability for immediate procurement.

LMH6551MMX/NOPB is the manufacturer-recommended alternative, also carrying Active product status. The MMX designation indicates extended temperature or performance screening. This part maintains identical electrical and mechanical specifications with 8,464 units available.

Both substitute parts are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original LMH6551MM specifications. Selection between LMH6551MM/NOPB and LMH6551MMX/NOPB depends on application-specific screening requirements and inventory availability at the time of procurement.

Frequently Asked Questions (FAQ)

Q: Can LMH6551MM/NOPB be used as a direct replacement for LMH6551MM?

A: Yes. LMH6551MM/NOPB is a direct substitute. All electrical parameters, operating temperature range, supply voltage specifications, slew rate, bandwidth, and package dimensions are identical. The /NOPB suffix indicates lead-free plating, which is compatible with standard PCB assembly processes.

Q: What is the difference between LMH6551MM/NOPB and LMH6551MMX/NOPB?

A: Both parts maintain identical electrical specifications and package compatibility. The MMX designation indicates manufacturer-recommended screening or extended performance validation. Selection should be based on application requirements and inventory availability.

Q: Why is the LMH6551MM classified as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued this specific part number. LMH6551MM/NOPB and LMH6551MMX/NOPB are active alternatives that provide equivalent functionality and ensure continued supply availability.

Q: Are the package dimensions identical across all three part numbers?

A: Yes. All three parts use the 8-VSSOP supplier device package with dimensions of 8-TSSOP, 8-MSOP (0.118", 3.00mm Width). PCB footprints and assembly processes are interchangeable.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. LMH6551MM, LMH6551MM/NOPB, and LMH6551MMX/NOPB are all ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating. REACH status is Unaffected for all variants.

Q: What is the operating temperature range for these parts?

A: All three part numbers operate across -40°C to 125°C. This range is maintained across all electrical and thermal specifications.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. The electrical specifications, supply voltage requirements (3 V to 12 V), output current capability (65 mA per channel), and all signal characteristics are identical. Direct PCB substitution is supported without design modification.