LMH6550MA Equivalent & Substitute Parts

Part Overview

The LMH6550MA is a voltage feedback amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device features a single differential output circuit with a 400 MHz bandwidth and 3000 V/µs slew rate, designed for high-speed signal conditioning applications. The LMH6550MA is currently designated as Last Time Buy, indicating end-of-life status. Equivalent and substitute parts are necessary to ensure design continuity and maintain supply chain reliability for applications requiring voltage feedback amplification with differential output capability.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	1	—
Output Type	Differential	—
-3dB Bandwidth	400	MHz
Slew Rate	3000	V/µs
Current - Input Bias	8	µA
Voltage - Input Offset	1	mV
Current - Supply	20	mA
Current - Output / Channel	75	mA
Voltage - Supply Span (Min)	4.5	V
Voltage - Supply Span (Max)	12	V
Operating Temperature Range	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LMH6550MA is determined by electrical and mechanical compatibility across the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: Voltage Feedback
Number of Circuits: 1
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C to 85°C
RoHS Status: ROHS3 Compliant

Secondary Performance Parameters:

-3dB Bandwidth: 400 MHz (primary specification)
Slew Rate: 3000 V/µs (primary specification)
Output Type: Differential (primary specification)
Current - Output / Channel: 75 mA (primary specification)
Voltage - Supply Span: 4.5 V to 12 V (primary specification)

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalents: Parts that maintain all primary electrical specifications and differential output configuration. These parts are pin-compatible and functionally identical.

Category 2 - Functional Alternatives: Parts that share the same package, mounting type, and amplifier topology but may have reduced bandwidth, slew rate, or output current specifications. These parts are suitable for applications with less stringent performance requirements.

Parameter Comparison

Parameter	LMH6550MA	LMH6550MA/NOPB	LMH6550MAX/NOPB	AD8048ARZ	MAX4430ESA+T	MAX452CSA+
Manufacturer	Texas Instruments	National Semiconductor	Texas Instruments	Analog Devices Inc.	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Product Status	Last Time Buy	Active	Active	Active	Active	Obsolete
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback
Number of Circuits	1	1	1	1	1	1
-3dB Bandwidth	400 MHz	400 MHz	400 MHz	260 MHz	180 MHz	50 MHz
Slew Rate	3000 V/µs	3000 V/µs	3000 V/µs	1000 V/µs	100 V/µs	300 V/µs
Current - Input Bias	8 µA	8 µA	8 µA	1 µA	11 µA	—
Voltage - Input Offset	1 mV	1 mV	1 mV	1 mV	1.25 mV	—
Current - Supply	20 mA	20 mA	20 mA	5.9 mA	11 mA	25 mA
Current - Output / Channel	75 mA	75 mA	75 mA	50 mA	60 mA	20 mA
Voltage - Supply Span (Min)	4.5 V	4.5 V	4.5 V	6 V	9 V	±4.5 V
Voltage - Supply Span (Max)	12 V	12 V	12 V	12 V	11 V	±5.5 V
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	—	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Equivalent Selection:

The LMH6550MA/NOPB (National Semiconductor) and LMH6550MAX/NOPB (Texas Instruments) are direct equivalents with identical electrical specifications. Both maintain the 400 MHz bandwidth, 3000 V/µs slew rate, and differential output configuration. The LMH6550MAX/NOPB is recommended as the primary substitute due to its Active product status and availability in Tape & Reel packaging, which is standard for production environments. The LMH6550MA/NOPB is available as a secondary option with higher inventory levels.

Functional Alternative Selection:

The AD8048ARZ (Analog Devices Inc.) operates with reduced bandwidth (260 MHz) and slew rate (1000 V/µs) but maintains compatibility with the 8-SOIC package and -40°C to 85°C operating range. This device is suitable for applications where the full 400 MHz bandwidth is not required. The AD8048ARZ offers lower supply current (5.9 mA) and lower input bias current (1 µA), making it advantageous for power-sensitive designs.

The MAX4430ESA+T (Analog Devices Inc./Maxim Integrated) provides further performance reduction with 180 MHz bandwidth and 100 V/µs slew rate. This device is appropriate for lower-frequency signal conditioning applications. Supply voltage range is restricted to 9 V to 11 V, requiring verification against system power distribution specifications.

The MAX452CSA+ (Analog Devices Inc./Maxim Integrated) is designated as Obsolete and should not be selected for new designs. This device exhibits significantly reduced performance (50 MHz bandwidth, 300 V/µs slew rate) and is included for reference only in legacy system maintenance scenarios.

Compliance Verification:

All recommended substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) ratings, ensuring compatibility with standard manufacturing and storage procedures. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001.

Frequently Asked Questions (FAQ)

Q: Can the LMH6550MA/NOPB be used as a direct replacement for the LMH6550MA?

A: Yes. The LMH6550MA/NOPB is a direct equivalent with identical electrical specifications, package configuration, and operating parameters. The primary difference is manufacturer designation (National Semiconductor versus Texas Instruments) and product status (Active versus Last Time Buy). No circuit modifications are required.

Q: What is the difference between the LMH6550MAX/NOPB and LMH6550MA/NOPB?

A: Both devices are electrically identical with 400 MHz bandwidth and 3000 V/µs slew rate. The primary difference is packaging format: LMH6550MAX/NOPB is supplied in Tape & Reel (TR) format for automated assembly, while LMH6550MA/NOPB is supplied in tube packaging. The LMH6550MAX/NOPB is recommended for production environments.

Q: Can the AD8048ARZ replace the LMH6550MA in all applications?

A: The AD8048ARZ is a functional alternative suitable for applications where bandwidth requirements do not exceed 260 MHz and slew rate does not exceed 1000 V/µs. The device shares the same 8-SOIC package and operating temperature range. Applications requiring the full 400 MHz bandwidth and 3000 V/µs slew rate of the LMH6550MA must use direct equivalents (LMH6550MA/NOPB or LMH6550MAX/NOPB).

Q: What are the supply voltage constraints for substitute parts?

A: The LMH6550MA operates with supply voltage range 4.5 V to 12 V. Direct equivalents (LMH6550MA/NOPB and LMH6550MAX/NOPB) maintain this range. The AD8048ARZ requires minimum 6 V supply. The MAX4430ESA+T requires supply voltage between 9 V and 11 V, which is more restrictive than the original device. Verify system power distribution specifications before selecting MAX4430ESA+T.

Q: Is the MAX452CSA+ suitable for new designs?

A: No. The MAX452CSA+ is designated as Obsolete and should not be selected for new designs. This device is included in the substitute list for reference only in legacy system maintenance and repair scenarios. For new designs, select LMH6550MAX/NOPB or LMH6550MA/NOPB as direct equivalents, or AD8048ARZ as a functional alternative.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts (LMH6550MA/NOPB, LMH6550MAX/NOPB, AD8048ARZ, and MAX4430ESA+T) are ROHS3 compliant. The MAX452CSA+ is also ROHS3 compliant but is Obsolete. Compliance documentation is available from respective manufacturers.

Q: What is the Moisture Sensitivity Level (MSL) for substitute parts?

A: All substitute parts maintain Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity constraints. Standard storage and handling procedures are applicable without special desiccant or humidity control requirements.

Q: Can substitute parts be mixed in the same circuit board assembly?

A: Yes, provided all parts meet the electrical requirements of the specific circuit application. However, mixing different manufacturers or product variants in the same assembly may complicate supply chain management and traceability. Standardization on a single substitute part is recommended for production consistency.

Q: What is the inventory status of substitute parts?

A: LMH6550MAX/NOPB has 2100 units in stock (Active status). LMH6550MA/NOPB has 1613 units in stock (Active status). AD8048ARZ has 4632 units in stock (Active status). MAX4430ESA+T has 933 units in stock (Active status). Inventory levels are subject to change; verify current availability with supplier before design commitment.

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