AD781ANZ Equivalent & Substitute Parts

Part Overview

The AD781ANZ is an active sample and hold amplifier integrated circuit manufactured by Analog Devices Inc. This linear amplifier device contains one sample and hold circuit and is housed in an 8-pin DIP package for through-hole mounting applications. The AD781ANZ is classified as an active product with full RoHS3 compliance and unlimited moisture sensitivity rating.

Sample and hold amplifiers are essential components in data acquisition systems, analog-to-digital conversion circuits, and precision measurement applications where signal sampling at specific time intervals is required. Equivalent and substitute parts become necessary when the primary part experiences supply constraints, inventory limitations, or when design requirements permit operation within alternative electrical specifications.

Substiute Parts

AD781ANZ

Analog Devices Inc.In Stock: 1415AD781ANZ Datasheet

Current PartRFQ

LF398N8#PBF

Analog Devices Inc.In Stock: 825LF398N8#PBF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the AD781ANZ with equivalent parts is determined by strict alignment of electrical and mechanical parameters within the sample and hold amplifier category. The primary substitution criteria are:

Functional Equivalence: Both the main part and substitute must operate as single-circuit sample and hold amplifiers with identical package configuration (8-DIP through-hole mounting).

Electrical Compatibility: Substitute parts must operate within the specified bandwidth, current consumption, and supply voltage ranges. The AD781ANZ operates with a supply voltage span of 21.6 V to 26.4 V and requires 4 mA supply current with 50 nA input bias current.

Thermal and Environmental Compliance: Operating temperature range, RoHS compliance status, and moisture sensitivity classification must be verified for the intended application environment.

Mechanical Compatibility: Package type, pin count, and mounting method must be identical to ensure direct board-level substitution without redesign.

The LF398N8#PBF qualifies as a substitute part based on matching amplifier type, circuit count, package configuration, and through-hole mounting specification. However, electrical parameter differences exist that require evaluation for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

AD781ANZ Selection Criteria: The AD781ANZ is appropriate for applications requiring operation across the extended supply voltage range of 21.6 V to 26.4 V and extended temperature operation from -40°C to 85°C. This part maintains active product status with full RoHS3 compliance and unlimited moisture sensitivity rating, suitable for industrial and military-grade applications.

LF398N8#PBF Selection Criteria: The LF398N8#PBF is appropriate for applications operating within the 0°C to 70°C temperature range and supply voltages between 10 V and 36 V. This substitute part offers lower input bias current (10 nA versus 50 nA) and maintains identical RoHS3 and moisture sensitivity compliance. The LF398N8#PBF is suitable for commercial-grade applications where extended temperature operation is not required.

Compliance Verification: Both parts maintain ROHS3 compliance, REACH unaffected status, and identical moisture sensitivity classification (MSL 1 - Unlimited), ensuring regulatory equivalence for applications subject to environmental and hazardous substance restrictions.

Supply Voltage Consideration: The LF398N8#PBF operates across a broader supply voltage range (10 V to 36 V) compared to the AD781ANZ (21.6 V to 26.4 V). Applications utilizing the AD781ANZ supply voltage range will operate within the LF398N8#PBF specification window.

Frequently Asked Questions (FAQ)

Q: Can the LF398N8#PBF directly replace the AD781ANZ in all applications?

A: Direct replacement is possible only when the application operates within the LF398N8#PBF operating temperature range of 0°C to 70°C. Applications requiring extended temperature operation from -40°C to 85°C must retain the AD781ANZ. Both parts share identical package configuration and mounting type, enabling direct board-level substitution when thermal requirements are satisfied.

Q: What is the primary electrical difference between these two parts?

A: The LF398N8#PBF exhibits lower input bias current (10 nA) compared to the AD781ANZ (50 nA). The LF398N8#PBF also operates across a wider supply voltage range (10 V to 36 V) versus the AD781ANZ (21.6 V to 26.4 V). Supply current consumption differs slightly, with the LF398N8#PBF requiring 4.5 mA versus 4 mA for the AD781ANZ.

Q: Are both parts suitable for RoHS-compliant applications?

A: Yes. Both the AD781ANZ and LF398N8#PBF maintain ROHS3 compliance and REACH unaffected status, qualifying both parts for applications subject to environmental and hazardous substance regulations.

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

A: Both parts carry Moisture Sensitivity Level (MSL) 1 classification, indicating unlimited shelf life and no special moisture control requirements during storage, handling, or assembly.

Q: Can these parts be used interchangeably in printed circuit board designs?

A: Yes, from a mechanical and package perspective. Both parts utilize 8-DIP (0.300", 7.62mm) through-hole packaging with identical pin configurations. Electrical parameter differences must be evaluated for specific circuit requirements before substitution.

Q: What inventory status should be considered when selecting between these parts?

A: The AD781ANZ maintains 1311 pieces in stock, while the LF398N8#PBF maintains 770 pieces in stock. Inventory availability may influence part selection when supply continuity is a design consideration.