LMH6551MA Equivalent & Substitute Parts

Part Overview

The LMH6551MA is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device features a single differential output circuit with high slew rate performance of 2400V/µs and -3dB bandwidth of 370 MHz, designed for high-speed signal conditioning applications.

The LMH6551MA carries an Obsolete product status. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for systems utilizing this amplifier topology.

Substiute Parts

LMH6551MA

Texas InstrumentsIn Stock: 3493LMH6551MA Datasheet

Current PartRFQ

LMH6551MA/NOPB

Texas InstrumentsIn Stock: 100430LMH6551MA/NOPB Datasheet

DirectRFQ

MAX4430ESA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 965MAX4430ESA+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LMH6551MA are evaluated based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

• Amplifier topology (Voltage Feedback)
• Circuit count (1 circuit)
• Package type (8-SOIC surface mount)
• Output configuration (Differential)
• Slew rate performance (2400V/µs minimum)
• Bandwidth capability (-3dB ≥ 370 MHz)
• Supply voltage range compatibility (3V to 12V overlap)
• Operating temperature range (-40°C to 125°C minimum)

Identified Substitute Categories:

Direct Functional Equivalent: LMH6551MA/NOPB is the same base device (LMH6551) with identical electrical specifications and packaging, differentiated only by packaging format (Tube vs. standard) and product status (Active vs. Obsolete).

Cross-Manufacturer Alternative: MAX4430ESA+T is a voltage feedback amplifier from Analog Devices Inc./Maxim Integrated in 8-SOIC packaging. This device operates within compatible supply voltage ranges and maintains the single-circuit, differential-output architecture. However, electrical performance parameters differ in slew rate, bandwidth, and input characteristics, requiring application-level verification of performance adequacy.

Parameter Comparison

Engineering Selection Recommendations

LMH6551MA/NOPB (Direct Equivalent):

The LMH6551MA/NOPB is the primary substitute for the obsolete LMH6551MA. This part maintains identical electrical specifications across all measured parameters: slew rate, bandwidth, input bias current, input offset voltage, supply current, output current, and supply voltage range. The device is pin-compatible and functionally interchangeable at the circuit level.

The LMH6551MA/NOPB carries Active product status, ensuring long-term availability and supply chain continuity. The part is ROHS3 compliant, meeting current environmental and regulatory requirements, whereas the original LMH6551MA is RoHS non-compliant. Inventory availability is significantly higher (100,400 pieces vs. 3,416 pieces), supporting production scalability.

The only distinction is packaging format: LMH6551MA/NOPB is supplied in Tube packaging, whereas the original may have used standard packaging. This difference does not affect electrical performance or circuit functionality.

MAX4430ESA+T (Cross-Manufacturer Alternative):

The MAX4430ESA+T is a voltage feedback amplifier from Analog Devices Inc./Maxim Integrated, housed in the same 8-SOIC surface mount package. This device is suitable for applications where the reduced performance specifications are acceptable.

Key electrical differences must be noted:

• Slew rate is 100V/µs (vs. 2400V/µs for LMH6551MA), representing a 24× reduction in slew rate performance
• -3dB bandwidth is 180 MHz (vs. 370 MHz), representing a 2.06× reduction in bandwidth
• Input bias current is 11 µA (vs. 4 µA)
• Input offset voltage is 1.25 mV (vs. 500 µV)
• Supply voltage minimum is 9V (vs. 3V), restricting operation in low-voltage applications
• Operating temperature maximum is 85°C (vs. 125°C), limiting high-temperature operation

The MAX4430ESA+T is ROHS3 compliant and carries Active product status. Selection of this device is appropriate only for applications where the reduced slew rate and bandwidth do not compromise system performance, and where supply voltage and temperature operating ranges align with application requirements.

Frequently Asked Questions (FAQ)

Q: Can LMH6551MA/NOPB be used as a direct replacement for LMH6551MA?

A: Yes. The LMH6551MA/NOPB is electrically and functionally identical to the LMH6551MA across all specified parameters. The devices are pin-compatible and require no circuit modifications. The primary difference is packaging format (Tube) and product status (Active vs. Obsolete).

Q: What are the main limitations of MAX4430ESA+T as a substitute?

A: The MAX4430ESA+T has significantly reduced slew rate (100V/µs vs. 2400V/µs) and bandwidth (180 MHz vs. 370 MHz). Additionally, the minimum supply voltage is 9V, preventing use in applications requiring 3V to 8V operation. The maximum operating temperature is 85°C, limiting high-temperature applications. These differences require application-level performance verification before selection.

Q: Are all three parts pin-compatible in 8-SOIC packaging?

A: All three parts use 8-SOIC (0.154", 3.90mm Width) surface mount packaging. Physical pin compatibility is maintained. However, electrical performance differences between LMH6551MA and MAX4430ESA+T may require circuit design adjustments to maintain system performance specifications.

Q: What is the difference between LMH6551MA and LMH6551MA/NOPB?

A: The base device (LMH6551) is identical. The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging and ROHS3 compliance. The LMH6551MA/NOPB is supplied in Tube packaging format. Electrical specifications are identical between the two variants.

Q: Which substitute should be selected for new designs?

A: For new designs requiring the full performance specifications of the original LMH6551MA (2400V/µs slew rate, 370 MHz bandwidth, 3V to 12V supply range), the LMH6551MA/NOPB is the appropriate selection. This device provides identical electrical performance with improved regulatory compliance and active product status.

Q: Is RoHS compliance a factor in substitute selection?

A: RoHS compliance status is provided for regulatory and procurement purposes. The LMH6551MA/NOPB and MAX4430ESA+T are both ROHS3 compliant, whereas the original LMH6551MA is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, the compliant alternatives are necessary.

Q: Can MAX4430ESA+T be used in high-speed signal conditioning applications?

A: The MAX4430ESA+T has reduced bandwidth (180 MHz) and slew rate (100V/µs) compared to the LMH6551MA (370 MHz, 2400V/µs). Applications requiring high-speed transient response or wide bandwidth signal conditioning may not be suitable for the MAX4430ESA+T. Application-specific performance analysis is required.