OPA188AIDR Zero-Drift Operational Amplifier Equivalent & Substitute Parts

Part Overview

The OPA188AIDR is an active linear amplifier integrated circuit manufactured by Texas Instruments, classified as a zero-drift operational amplifier with single-circuit configuration. This device is designed for precision analog signal conditioning applications requiring minimal input offset voltage and low input bias current. The part is currently in active production status with 32,900 units available in inventory.

Substitute parts are identified when equivalent functional performance can be achieved through alternative manufacturer offerings that maintain compatibility with the specified electrical and mechanical parameters. The OPA188AIDR operates across a wide supply voltage range (4V to 36V) and extended temperature range (-55°C to 150°C), making substitution analysis critical for applications requiring component availability or supply chain flexibility.

Substiute Parts

OPA188AIDR

Texas InstrumentsIn Stock: 32946OPA188AIDR Datasheet

Current PartRFQ

NCS21911SN2T1G

onsemiIn Stock: 3238NCS21911SN2T1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OPA188AIDR is determined by functional equivalence across the following critical parameters:

Functional Equivalence Criteria:

• Amplifier Type: Zero-Drift topology required
• Number of Circuits: Single-circuit configuration
• Output Type: Rail-to-Rail output capability
• Gain Bandwidth Product: 2 MHz minimum
• Supply Voltage Range: Minimum 4V to 36V maximum compatibility
• Mounting Type: Surface Mount technology

Mechanical Compatibility Considerations:

• Package form factor and pin count compatibility with PCB layout
• Moisture sensitivity level and storage requirements
• RoHS and REACH compliance status

The NCS21911SN2T1G from onsemi meets the functional equivalence criteria as a zero-drift, single-circuit, rail-to-rail operational amplifier with 2 MHz gain bandwidth product and 4V to 36V supply range. However, package differences (5-TSOP versus 8-SOIC) and operating temperature range variations require design-level evaluation for specific applications.

Parameter Comparison

Engineering Selection Recommendations

OPA188AIDR Selection Criteria:

• Applications requiring extended operating temperature range (-55°C to 150°C)
• Designs utilizing 8-SOIC package footprint with established PCB layout
• Systems with 1-year moisture sensitivity storage requirements
• Texas Instruments supply chain preference or existing qualification

NCS21911SN2T1G Selection Criteria:

• Applications operating within -40°C to 125°C temperature range
• Designs compatible with 5-TSOP (SOT-23-5) package footprint
• Systems benefiting from improved slew rate performance (1.6V/µs versus 0.8V/µs)
• Lower input offset voltage requirement (1 µV versus 6 µV)
• Unlimited moisture sensitivity storage capability
• onsemi supply chain preference or existing qualification

Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications. Supply voltage compatibility (4V to 36V) is equivalent across both parts.

Frequently Asked Questions (FAQ)

Q: Can the NCS21911SN2T1G directly replace the OPA188AIDR on an existing PCB?

A: Direct PCB replacement is not possible due to package differences. The OPA188AIDR uses 8-SOIC packaging while the NCS21911SN2T1G uses 5-TSOP (SOT-23-5) packaging. These packages have different pin counts, spacing, and footprints. PCB redesign or adapter solutions are required for physical substitution.

Q: What are the functional differences between these two zero-drift amplifiers?

A: Both devices share identical gain bandwidth product (2 MHz) and supply voltage range (4V to 36V). The NCS21911SN2T1G offers superior performance in slew rate (1.6V/µs versus 0.8V/µs), input offset voltage (1 µV versus 6 µV), and input bias current (100 pA versus 160 pA). The OPA188AIDR provides extended temperature range coverage (-55°C to 150°C versus -40°C to 125°C).

Q: Are both parts RoHS compliant?

A: Yes, both the OPA188AIDR and NCS21911SN2T1G are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for industrial applications.

Q: What is the significance of moisture sensitivity level differences?

A: The OPA188AIDR has MSL 2 (1-year storage limit), while the NCS21911SN2T1G has MSL 1 (unlimited storage). MSL 1 provides greater flexibility in inventory management and reduces risk of moisture-induced failures during extended storage periods.

Q: Which part should be selected for high-temperature applications?

A: The OPA188AIDR supports operating temperatures up to 150°C, making it suitable for high-temperature environments. The NCS21911SN2T1G maximum operating temperature is 125°C, limiting its use in applications exceeding this threshold.

Q: Are supply current requirements equivalent?

A: Supply current is nearly equivalent: OPA188AIDR at 450 µA and NCS21911SN2T1G at 475 µA. This 25 µA difference is negligible for most power budget calculations in typical applications.