OP221GSZ-REEL Equivalent & Substitute Parts

Part Overview

The OP221GSZ-REEL is a general-purpose operational amplifier manufactured by Analog Devices Inc., configured as a dual-channel (2 circuit) integrated circuit in 8-SOIC surface-mount packaging. This device is actively produced and widely used in analog signal conditioning, instrumentation, and general amplification applications requiring low-power operation across extended temperature ranges.

Substitute parts are identified when equivalent electrical performance, package compatibility, and operational specifications align with the OP221GSZ-REEL. Substitution becomes necessary due to component availability, supply chain constraints, design optimization, or application-specific performance requirements.

Substiute Parts

OP221GSZ-REEL

Analog Devices Inc.In Stock: 2171OP221GSZ-REEL Datasheet

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LT1208CS8#PBF

Analog Devices Inc.In Stock: 4367LT1208CS8#PBF Datasheet

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LM258DG4

Texas InstrumentsIn Stock: 1476LM258DG4 Datasheet

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LM258DR

UMWIn Stock: 455175LM258DR Datasheet

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MC33078DT

STMicroelectronicsIn Stock: 133533MC33078DT Datasheet

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MC33078YDT

STMicroelectronicsIn Stock: 7893MC33078YDT Datasheet

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TS522IDT

STMicroelectronicsIn Stock: 2298TS522IDT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the OP221GSZ-REEL are selected based on the following critical parameters:

Primary Substitution Criteria:

• Number of Circuits: 2 (dual-channel configuration)
• Package / Case: 8-SOIC (0.154", 3.90mm Width) or equivalent 8-pin surface-mount package
• Mounting Type: Surface Mount
• Amplifier Type: General Purpose or Audio (compatible functional category)
• Voltage - Supply Span: Minimum 5 V to 30 V maximum (overlapping supply range)
• Operating Temperature: Coverage of -55°C to 125°C or subset thereof
• RoHS Compliance: ROHS3 Compliant

Secondary Performance Parameters:

• Slew Rate: 0.3 V/µs or higher
• Current - Input Bias: 70 nA or lower (lower bias current preferred)
• Voltage - Input Offset: 250 µV or lower (lower offset preferred)
• Current - Supply: 850 µA per channel or lower (lower power consumption preferred)

Substitutes are grouped by their alignment with these criteria. Parts meeting all primary criteria are considered direct substitutes. Parts with superior performance characteristics (higher slew rate, lower bias current, lower offset voltage) are noted as performance-enhanced alternatives.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Primary Selection):

LM258DR (UMW) is the most suitable direct substitute for the OP221GSZ-REEL. This part maintains identical package geometry (8-SOIC), dual-channel configuration, and general-purpose amplifier classification. The LM258DR operates across the required supply voltage range (5 V to 32 V) and temperature range (-25°C to 85°C), with input bias current (45 nA) and input offset voltage (2 mV) within acceptable margins of the OP221GSZ-REEL. Product status is Active with ROHS3 compliance. Supply availability is substantial (455,100 pcs in stock).

MC33078YDT (STMicroelectronics) provides enhanced performance characteristics while maintaining package and circuit count compatibility. This part features lower input offset voltage (150 µV versus 250 µV), higher slew rate (7 V/µs versus 0.3 V/µs), and extended operating temperature range (-40°C to 105°C). The MC33078YDT includes AEC-Q100 automotive qualification and is actively produced. Supply availability is adequate (7,800 pcs in stock).

TS522IDT (STMicroelectronics) is classified as an audio amplifier but maintains electrical compatibility with general-purpose applications. This part offers identical package configuration, dual-channel design, and extended temperature range (-40°C to 125°C) matching the OP221GSZ-REEL upper limit. The TS522IDT includes AEC-Q100 automotive qualification and is actively produced. Input offset voltage (850 µV) is higher than the OP221GSZ-REEL but acceptable for non-precision applications.

Performance-Enhanced Alternatives:

LT1208CS8#PBF (Analog Devices Inc.) offers significantly higher slew rate (400 V/µs) and gain bandwidth product (45 MHz), making it suitable for high-speed signal conditioning applications. However, operating temperature range (0°C to 70°C) is narrower than the OP221GSZ-REEL, and input bias current (4 µA) is substantially higher. Packaging is Tube rather than Tape & Reel. This part is actively produced and ROHS3 compliant.

Not Recommended:

LM258DG4 (Texas Instruments) is marked as Obsolete and should not be selected for new designs or long-term production applications, despite electrical compatibility with the OP221GSZ-REEL.

Frequently Asked Questions (FAQ)

Q: Can the LM258DR be used as a direct replacement for the OP221GSZ-REEL in all applications?

A: The LM258DR is electrically compatible with the OP221GSZ-REEL across the overlapping supply voltage range (5 V to 30 V) and shares identical 8-SOIC package geometry. However, the LM258DR operating temperature range (-25°C to 85°C) does not extend to the OP221GSZ-REEL lower limit (-55°C). Applications requiring operation below -25°C require alternative selection.

Q: What is the primary difference between the MC33078YDT and the OP221GSZ-REEL?

A: The MC33078YDT provides superior performance in slew rate (7 V/µs versus 0.3 V/µs) and input offset voltage (150 µV versus 250 µV), with extended operating temperature range (-40°C to 105°C). Both parts share identical 8-SOIC packaging and dual-channel configuration. The MC33078YDT includes AEC-Q100 automotive qualification, making it suitable for automotive and industrial applications.

Q: Why is the TS522IDT classified as an audio amplifier rather than general-purpose?

A: The TS522IDT is designated as an audio amplifier by the manufacturer based on design optimization for audio frequency response and distortion characteristics. However, the electrical parameters (supply voltage range, slew rate, bandwidth, package configuration) are compatible with general-purpose amplifier applications. Selection depends on application-specific frequency response and distortion requirements.

Q: Is the LT1208CS8#PBF suitable for replacing the OP221GSZ-REEL in low-temperature applications?

A: No. The LT1208CS8#PBF operating temperature range (0°C to 70°C) does not support the OP221GSZ-REEL lower operating limit of -55°C. The LT1208CS8#PBF is suitable only for applications operating within 0°C to 70°C. For extended low-temperature operation, the MC33078YDT (-40°C to 105°C) or TS522IDT (-40°C to 125°C) are appropriate alternatives.

Q: What packaging differences exist between substitute parts?

A: All substitute parts listed use 8-SOIC (0.154", 3.90mm Width) surface-mount package geometry, ensuring mechanical and electrical compatibility with the OP221GSZ-REEL. Packaging format differences (Tape & Reel versus Cut Tape versus Tube) affect supply chain handling and do not impact circuit performance or PCB assembly compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (LT1208CS8#PBF, LM258DG4, LM258DR, MC33078YDT, TS522IDT) are ROHS3 compliant, matching the OP221GSZ-REEL compliance status. All parts have Moisture Sensitivity Level (MSL) 1 (Unlimited).

Q: Which substitute part offers the lowest power consumption?

A: The LM258DG4 specifies 500 µA supply current per channel (x2 channels = 1 mA total), which is lower than the OP221GSZ-REEL (850 µA x2 channels = 1.7 mA total). However, the LM258DG4 is marked as Obsolete. Among active products, the LM258DR (1 mA total) offers the lowest specified supply current.

Q: Can the OP221GSZ-REEL be substituted with the LM258DG4 in new product designs?

A: No. The LM258DG4 is marked as Obsolete and should not be selected for new designs. Active alternatives such as LM258DR, MC33078YDT, or TS522IDT are recommended for new product development.