MAX436CSD Equivalent & Substitute Parts

Part Overview

The MAX436CSD is a transconductance amplifier integrated circuit manufactured by Analog Devices Inc./Maxim Integrated, housed in a 14-SOIC surface mount package. This device is classified as obsolete, indicating discontinued production and limited availability for new designs. The MAX436CSD features a single transconductance amplifier circuit with a slew rate of 850V/µs and -3dB bandwidth of 200 MHz, designed for applications requiring high-speed signal conditioning and transimpedance conversion.

Due to its obsolete status, identifying functionally equivalent substitute components is essential for design continuity, production support, and long-term supply chain reliability. Substitute parts must maintain compatibility with existing circuit topologies while meeting or exceeding the electrical performance specifications of the original device.

Substiute Parts

MAX436CSD

Analog Devices Inc./Maxim IntegratedIn Stock: 3073MAX436CSD Datasheet

Current PartRFQ

LMH6503MAX/NOPB

National SemiconductorIn Stock: 3655LMH6503MAX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute part identification for the MAX436CSD is based on the following critical parameters that define functional equivalence:

Package Compatibility: The substitute must utilize the 14-SOIC surface mount package to ensure direct PCB layout compatibility without redesign.

Circuit Configuration: Single-circuit amplifier topology is required to maintain functional equivalence in existing designs.

Electrical Performance Envelope: The substitute must operate within compatible supply voltage ranges and deliver comparable slew rate and bandwidth characteristics for signal integrity.

Thermal and Environmental Operating Range: The substitute must support the operating temperature specifications of the original application environment.

The LMH6503MAX/NOPB from National Semiconductor meets these substitution criteria through identical package geometry, single-circuit configuration, and compatible electrical performance characteristics. However, this substitute exhibits different amplifier type classification (Variable Gain vs. Transconductance), which reflects architectural differences that may require circuit topology evaluation for specific applications.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The MAX436CSD is classified as obsolete, whereas the LMH6503MAX/NOPB maintains active production status. This distinction is significant for long-term supply chain planning and design lifecycle management. Active product status ensures continued availability, manufacturing support, and compliance with evolving regulatory requirements.

Compliance and Certification: The LMH6503MAX/NOPB carries ECCN EAR99 and HTSUS 8542.33.0001 classifications, consistent with the original MAX436CSD. Both devices are subject to identical export control and tariff classifications, eliminating compliance complications during substitution.

Supply Voltage Compatibility: The LMH6503MAX/NOPB operates across a broader supply voltage range (5V to 12V) compared to the MAX436CSD (9.5V to 10.5V). Designs operating within the MAX436CSD supply envelope (9.5V to 10.5V) will function within the LMH6503MAX/NOPB operating range without modification.

Electrical Performance Trade-offs: The LMH6503MAX/NOPB exhibits higher slew rate (1800V/µs vs. 850V/µs) and higher output current capability (90mA vs. 20mA), providing enhanced performance headroom. However, the -3dB bandwidth is reduced (135MHz vs. 200MHz), and input bias current is elevated (11µA vs. 1µA). These differences require circuit-level evaluation to confirm suitability for specific signal conditioning applications.

Temperature Operating Range: The LMH6503MAX/NOPB supports an extended operating temperature range (-40°C to 85°C) compared to the MAX436CSD (0°C to 70°C), providing greater flexibility for industrial and automotive applications.

Frequently Asked Questions (FAQ)

Q: Can the LMH6503MAX/NOPB be used as a direct pin-for-pin replacement for the MAX436CSD?

A: Both devices utilize the 14-SOIC package with identical physical dimensions (0.154", 3.90mm width). Pin-level compatibility requires verification against specific pinout documentation. The identical package geometry permits direct PCB mounting without layout modification.

Q: What are the key electrical differences between these devices?

A: The LMH6503MAX/NOPB provides higher slew rate (1800V/µs vs. 850V/µs) and greater output current capability (90mA vs. 20mA). The -3dB bandwidth is lower (135MHz vs. 200MHz), and input bias current is higher (11µA vs. 1µA). These differences reflect distinct architectural approaches to amplifier design and must be evaluated within the context of the specific application circuit.

Q: Does the LMH6503MAX/NOPB require circuit modifications for substitution?

A: The broader supply voltage range of the LMH6503MAX/NOPB (5V to 12V) accommodates the MAX436CSD operating envelope (9.5V to 10.5V) without power supply modification. However, differences in input bias current, output current capability, and bandwidth may necessitate circuit topology evaluation to confirm functional equivalence for the specific application.

Q: What is the significance of the different amplifier type classifications?

A: The MAX436CSD is classified as a transconductance amplifier, while the LMH6503MAX/NOPB is classified as a variable gain amplifier. These classifications reflect different internal architectures and signal processing approaches. Application-specific circuit analysis is required to confirm that the LMH6503MAX/NOPB can fulfill the functional role of the MAX436CSD in the target design.

Q: Are there compliance or regulatory differences between these devices?

A: Both devices carry identical ECCN (EAR99) and HTSUS (8542.33.0001) classifications. Export control and tariff treatment are equivalent. The LMH6503MAX/NOPB maintains active product status, ensuring ongoing compliance with current regulatory standards and manufacturing practices.

Q: What inventory considerations apply to these devices?

A: The MAX436CSD has 2988 pieces available as new original stock. The LMH6503MAX/NOPB has 3545 pieces available as new original stock. Both devices are currently in inventory, supporting immediate procurement for design implementation or production support.