LMH6550MAX Equivalent & Substitute Parts

Part Overview

The LMH6550MAX is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. The LMH6550MAX features a single differential output circuit with high slew rate performance suitable for broadband signal conditioning applications.

Substiute Parts

LMH6550MAX

Texas InstrumentsIn Stock: 2184LMH6550MAX Datasheet

Current PartRFQ

LMH6550MAX/NOPB

Texas InstrumentsIn Stock: 2125LMH6550MAX/NOPB Datasheet

DirectRFQ

LT1818IS8#PBF

Analog Devices Inc.In Stock: 2462LT1818IS8#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LMH6550MAX is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

• Amplifier topology: Voltage Feedback architecture
• Circuit count: Single circuit configuration
• Output configuration: Differential output stage
• Package form factor: 8-SOIC surface mount package with 0.154" (3.90mm) width
• Operating temperature range: -40°C to 85°C minimum
• Supply voltage span: Minimum 4.5V to maximum 12V compatibility

Performance Parameters for Functional Equivalence:

• Slew rate: 3000 V/µs or greater
• Bandwidth: 400 MHz or greater
• Input bias current: 8 µA or lower
• Input offset voltage: 1 mV or lower
• Output current capability: 75 mA per channel or greater
• Supply current: 20 mA or lower

Substitute parts are classified into two categories: direct equivalents (identical specifications and packaging) and functional alternatives (meeting or exceeding performance requirements within the same package family).

Parameter Comparison

Engineering Selection Recommendations

LMH6550MAX/NOPB (Direct Equivalent - Recommended Primary Substitute)

The LMH6550MAX/NOPB is the direct functional equivalent of the obsolete LMH6550MAX. Both devices share identical electrical specifications, operating parameters, and package configuration. The primary distinction is product status: LMH6550MAX/NOPB is actively manufactured and supported by Texas Instruments, whereas the original LMH6550MAX is obsolete. The /NOPB suffix indicates lead-free, RoHS3 compliant packaging in tape and reel format. This part is the preferred substitute for direct replacement in new designs and production continuity.

LT1818IS8#PBF (Functional Alternative - Secondary Substitute)

The LT1818IS8#PBF manufactured by Analog Devices Inc. meets or exceeds the critical performance parameters of the LMH6550MAX within the same 8-SOIC package footprint. Key advantages include lower input bias current (2 µA versus 8 µA), lower input offset voltage (200 µV versus 1 mV), reduced supply current consumption (9 mA versus 20 mA), and extended minimum supply voltage range (2.5V versus 4.5V). The slew rate of 2500 V/µs is marginally lower than the 3000 V/µs specification but remains within acceptable performance envelope for most broadband applications. Both devices maintain 400 MHz bandwidth and compatible output current capability. The LT1818IS8#PBF is actively produced and RoHS3 compliant. This substitute is suitable for applications where lower power consumption and improved input characteristics are beneficial.

Both substitute parts maintain identical package geometry, surface mount compatibility, and operating temperature range, enabling direct PCB layout compatibility with designs originally specified for the LMH6550MAX.

Frequently Asked Questions (FAQ)

Q: Can LMH6550MAX/NOPB be used as a direct replacement for LMH6550MAX?

A: Yes. The LMH6550MAX/NOPB is electrically and mechanically identical to the LMH6550MAX. All electrical specifications, package dimensions, and pin configurations are equivalent. The primary difference is that LMH6550MAX/NOPB is actively manufactured and RoHS3 compliant, whereas LMH6550MAX is obsolete.

Q: What are the key differences between LMH6550MAX and LT1818IS8#PBF?

A: Both devices are voltage feedback amplifiers in 8-SOIC packages with 400 MHz bandwidth. The LT1818IS8#PBF offers superior input characteristics (2 µA bias current versus 8 µA, 200 µV offset versus 1 mV) and lower power consumption (9 mA versus 20 mA). The LMH6550MAX has a higher slew rate (3000 V/µs versus 2500 V/µs) and a narrower minimum supply voltage (4.5V versus 2.5V). Output current capability is comparable (70 mA versus 75 mA).

Q: Are both substitute parts pin-compatible with the original LMH6550MAX?

A: Yes. Both LMH6550MAX/NOPB and LT1818IS8#PBF use the standard 8-SOIC package with identical pin spacing (0.154" width, 3.90mm). PCB layouts designed for LMH6550MAX require no modification for either substitute.

Q: Which substitute should be selected for new designs?

A: LMH6550MAX/NOPB is the recommended choice for new designs requiring direct specification equivalence and continued Texas Instruments support. LT1818IS8#PBF is suitable when lower power consumption, improved input offset characteristics, or wider supply voltage range provide design advantages.

Q: Are both substitutes RoHS compliant?

A: Yes. Both LMH6550MAX/NOPB and LT1818IS8#PBF are RoHS3 compliant. The original LMH6550MAX is RoHS non-compliant due to its obsolete status.

Q: What is the moisture sensitivity level for these parts?

A: All three parts (LMH6550MAX, LMH6550MAX/NOPB, and LT1818IS8#PBF) carry MSL rating 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

Q: Can the LT1818IS8#PBF be used in applications requiring 3000 V/µs slew rate?

A: The LT1818IS8#PBF has a specified slew rate of 2500 V/µs, which is 500 V/µs lower than the LMH6550MAX specification. Applications with strict slew rate requirements exceeding 2500 V/µs should use LMH6550MAX/NOPB to maintain specification compliance.