CS3011-ISZ Equivalent & Substitute Parts

Part Overview

The CS3011-ISZ is a single-channel instrumentation amplifier manufactured by Cirrus Logic Inc., housed in an 8-SOIC surface mount package. This device features rail-to-rail output capability and is designed for precision signal conditioning applications requiring low input offset voltage and low input bias current.

The CS3011-ISZ is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance of systems utilizing this component. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters.

Key Parameters

Parameter	CS3011-ISZ Value
Amplifier Type	Instrumentation
Number of Circuits	1
Output Type	Rail-to-Rail
Slew Rate	2 V/µs
Current - Input Bias	50 pA
Voltage - Input Offset	10 µV
Current - Supply	900 µA
Voltage - Supply Span (Min)	2.7 V
Voltage - Supply Span (Max)	6.7 V
Operating Temperature Range	-40°C to 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the CS3011-ISZ are identified based on the following critical parameters that determine functional compatibility:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure direct board-level replacement without layout modifications.

Supply Voltage Range: The CS3011-ISZ operates across 2.7 V to 6.7 V. Substitute parts must support this voltage span or a compatible subset that covers the application's operating voltage.

Input Bias Current: The CS3011-ISZ specifies 50 pA input bias current. Substitute parts with significantly lower input bias current (in the nanoampere range) represent improved performance characteristics while maintaining functional compatibility.

Input Offset Voltage: The CS3011-ISZ specifies 10 µV input offset voltage. Substitute parts with equal or lower input offset voltage maintain or improve precision performance.

Number of Circuits: All substitute parts must contain a single amplifier circuit to match the CS3011-ISZ configuration.

Operating Temperature Range: The CS3011-ISZ operates from -40°C to 85°C. Substitute parts with equal or extended temperature ranges ensure compatibility across the specified operating environment.

The two identified substitute parts—AD8555ARZ-REEL7 and AD8556ARZ-REEL—are zero-drift amplifiers manufactured by Analog Devices Inc. These devices meet the package, circuit count, and electrical parameter requirements for substitution.

Parameter Comparison

Parameter	CS3011-ISZ	AD8555ARZ-REEL7	AD8556ARZ-REEL
Manufacturer	Cirrus Logic Inc.	Analog Devices Inc.	Analog Devices Inc.
Number of Circuits	1	1	1
Slew Rate	2 V/µs	1.2 V/µs	1.2 V/µs
Current - Input Bias	50 pA	16 nA	49 nA
Voltage - Input Offset	10 µV	2 µV	2 µV
Current - Supply	900 µA	2 mA	2 mA
Voltage - Supply Span (Min)	2.7 V	2.7 V	4.5 V
Voltage - Supply Span (Max)	6.7 V	5.5 V	5.5 V
Operating Temperature (Min)	-40°C	-40°C	-40°C
Operating Temperature (Max)	85°C	125°C	140°C
Package / Case	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
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

AD8555ARZ-REEL7 Selection Criteria:

The AD8555ARZ-REEL7 is an active product manufactured by Analog Devices Inc. and carries ROHS3 compliance certification. This device supports the full minimum supply voltage range of the CS3011-ISZ (2.7 V minimum) and operates to 5.5 V maximum. The AD8555ARZ-REEL7 provides superior input offset voltage performance (2 µV versus 10 µV) and extended operating temperature range to 125°C. The device is suitable for applications where the CS3011-ISZ supply voltage does not exceed 5.5 V and where improved precision characteristics are acceptable.

AD8556ARZ-REEL Selection Criteria:

The AD8556ARZ-REEL is an active product manufactured by Analog Devices Inc. and carries ROHS3 compliance certification. This device operates across a 4.5 V to 5.5 V supply voltage range, which is narrower than the CS3011-ISZ specification. The AD8556ARZ-REEL provides superior input offset voltage performance (2 µV versus 10 µV) and the highest extended operating temperature range to 140°C. The device is suitable for applications where the CS3011-ISZ supply voltage remains within the 4.5 V to 5.5 V window.

Supply Voltage Consideration:

Applications requiring operation below 4.5 V supply voltage must use the AD8555ARZ-REEL7, as the AD8556ARZ-REEL does not support this lower voltage range. Applications operating exclusively within the 4.5 V to 5.5 V range may use either substitute part.

Moisture Sensitivity:

Both substitute parts feature MSL 1 (Unlimited) rating, providing superior moisture handling characteristics compared to the CS3011-ISZ MSL 2 (1 Year) rating.

Frequently Asked Questions (FAQ)

Q: Can the AD8555ARZ-REEL7 and AD8556ARZ-REEL be used interchangeably with the CS3011-ISZ?

A: Both devices are compatible substitutes for the CS3011-ISZ in terms of package, circuit count, and pin configuration. However, supply voltage range differences must be evaluated for each application. The AD8555ARZ-REEL7 supports the full 2.7 V minimum supply voltage of the CS3011-ISZ, while the AD8556ARZ-REEL requires a minimum of 4.5 V.

Q: What is the primary difference between the AD8555ARZ-REEL7 and AD8556ARZ-REEL?

A: The primary difference is the minimum supply voltage specification. The AD8555ARZ-REEL7 operates from 2.7 V minimum, matching the CS3011-ISZ lower limit. The AD8556ARZ-REEL operates from 4.5 V minimum. Both devices share identical slew rate (1.2 V/µs), input offset voltage (2 µV), and supply current (2 mA) specifications. The AD8556ARZ-REEL supports a higher maximum operating temperature (140°C versus 125°C).

Q: Are the substitute parts pin-compatible with the CS3011-ISZ?

A: All three devices use the 8-SOIC package with identical physical dimensions (0.154", 3.90mm Width). Pin-level compatibility must be verified against the specific pinout diagrams for each device, as amplifier type differences (instrumentation versus zero-drift) may result in different functional pin assignments.

Q: What compliance certifications apply to the substitute parts?

A: Both AD8555ARZ-REEL7 and AD8556ARZ-REEL carry ROHS3 compliance certification and are REACH Unaffected. Both devices are classified under ECCN EAR99 and HTSUS 8542.33.0001, matching the CS3011-ISZ regulatory classification.

Q: How do the input bias current specifications compare?

A: The CS3011-ISZ specifies 50 pA input bias current. The AD8555ARZ-REEL7 specifies 16 nA (16,000 pA), and the AD8556ARZ-REEL specifies 49 nA (49,000 pA). Both substitute parts exhibit significantly higher input bias current. Applications sensitive to input bias current effects must evaluate this parameter change.

Q: What is the significance of the zero-drift amplifier topology in the substitute parts?

A: The AD8555ARZ-REEL7 and AD8556ARZ-REEL employ zero-drift amplifier architecture, which achieves the specified 2 µV input offset voltage through internal chopper-stabilization techniques. This differs from the instrumentation amplifier topology of the CS3011-ISZ. The zero-drift approach provides superior offset voltage performance but may introduce different noise and frequency response characteristics.

Q: Are there inventory considerations for these substitute parts?

A: The CS3011-ISZ has 785 pieces in stock (obsolete status). The AD8555ARZ-REEL7 has 1,686 pieces in stock, and the AD8556ARZ-REEL has 15,960 pieces in stock. Both substitute parts are active products with significantly higher inventory availability.

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