CS3011-ISZR Equivalent & Substitute Parts

Part Overview

The CS3011-ISZR is an instrumentation amplifier manufactured by Cirrus Logic Inc., designed for single-circuit rail-to-rail applications in 8-SOIC surface mount packaging. This device is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and component procurement.

The CS3011-ISZR operates across a supply voltage range of 2.7 V to 6.7 V with a slew rate of 2 V/µs and input offset voltage of 10 µV, suitable for precision measurement and signal conditioning applications requiring low input bias current (50 pA).

Substiute Parts

CS3011-ISZR

Cirrus Logic Inc.In Stock: 1170CS3011-ISZR Datasheet

Current PartRFQ

AD8556ARZ

Analog Devices Inc.In Stock: 20547AD8556ARZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS3011-ISZR is determined by compatibility across the following critical parameters:

Package Compatibility: Both the main part and substitute must use 8-SOIC surface mount packaging with identical physical dimensions (0.154", 3.90mm Width) to ensure PCB footprint compatibility without layout redesign.

Mounting Type: Surface mount technology is required for both parts to maintain assembly process compatibility.

Number of Circuits: Single-circuit configuration is mandatory to match the original design topology.

Supply Voltage Range: The substitute must operate within or encompass the 2.7 V to 6.7 V supply range of the CS3011-ISZR. Substitutes with narrower supply ranges may not be compatible with all system configurations.

Operating Temperature Range: The substitute must support the -40°C to 85°C operating window or a wider range to ensure thermal compatibility.

Amplifier Classification: The substitute must function as either an instrumentation amplifier or zero-drift amplifier, both of which are precision analog signal conditioning devices suitable for measurement applications.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The CS3011-ISZR is classified as obsolete, while the AD8556ARZ is actively manufactured by Analog Devices Inc. For new designs or ongoing production requiring component replenishment, the AD8556ARZ provides assured long-term availability and supply chain continuity.

Compliance and Environmental Standards: The AD8556ARZ is ROHS3 compliant and carries REACH Unaffected status, meeting current regulatory requirements for electronic components in regulated markets. The CS3011-ISZR compliance documentation is not fully specified in available parameters.

Moisture Sensitivity: The AD8556ARZ carries MSL 1 (Unlimited), indicating superior moisture tolerance compared to the CS3011-ISZR (MSL 3, 168 Hours). This reduces handling and storage constraints during manufacturing and logistics.

Supply Voltage Range Limitation: The AD8556ARZ operates within 4.5 V to 5.5 V, which is narrower than the CS3011-ISZR range of 2.7 V to 6.7 V. Designs operating at the lower end of the original supply range (below 4.5 V) or upper end (above 5.5 V) cannot use the AD8556ARZ without circuit redesign.

Input Bias Current Difference: The AD8556ARZ exhibits input bias current of 49 nA compared to 50 pA in the CS3011-ISZR. Applications requiring extremely high input impedance or sensitive to bias current effects may require circuit compensation adjustments.

Frequently Asked Questions (FAQ)

Q: Can the AD8556ARZ be used as a direct pin-for-pin replacement for the CS3011-ISZR?

A: Both devices use 8-SOIC packaging with identical physical dimensions, enabling direct PCB footprint compatibility. However, electrical parameter differences require circuit validation before implementation. The narrower supply voltage range of the AD8556ARZ (4.5 V to 5.5 V versus 2.7 V to 6.7 V) may necessitate power supply modifications depending on the original design specifications.

Q: What are the key electrical differences between these two parts?

A: The AD8556ARZ features lower input offset voltage (2 µV versus 10 µV), superior for precision measurement applications. However, it exhibits higher input bias current (49 nA versus 50 pA), lower slew rate (1.2 V/µs versus 2 V/µs), and higher supply current consumption (2 mA versus 900 µA). The AD8556ARZ is classified as a zero-drift amplifier, while the CS3011-ISZR is an instrumentation amplifier, reflecting different internal architectures optimized for different application requirements.

Q: Is the AD8556ARZ suitable for low-voltage applications below 4.5 V?

A: No. The AD8556ARZ minimum supply voltage is 4.5 V. Designs requiring operation below this threshold cannot use the AD8556ARZ without alternative component selection or circuit redesign to step up the supply voltage.

Q: What is the impact of the higher input bias current in the AD8556ARZ?

A: The AD8556ARZ input bias current of 49 nA is approximately 1000 times higher than the CS3011-ISZR (50 pA). In circuits with very high source impedances (megohm range), this difference may introduce measurable offset errors. Circuit analysis is required to determine if bias current compensation techniques are necessary.

Q: Are there any compliance or regulatory advantages to using the AD8556ARZ?

A: Yes. The AD8556ARZ is ROHS3 compliant and carries MSL 1 rating (unlimited moisture sensitivity), compared to the CS3011-ISZR MSL 3 (168 hours). For applications subject to environmental regulations or requiring extended shelf life without moisture-controlled storage, the AD8556ARZ provides compliance advantages.

Q: Why is the CS3011-ISZR obsolete?

A: The CS3011-ISZR is listed as obsolete by Cirrus Logic Inc., indicating the manufacturer has discontinued production. The AD8556ARZ, actively produced by Analog Devices Inc., represents a current-generation alternative for applications requiring precision single-circuit amplification in 8-SOIC packaging.