OPA355UA/2K5G4 Equivalent & Substitute Parts

Part Overview

The OPA355UA/2K5G4 is a CMOS rail-to-rail amplifier manufactured by Texas Instruments in an 8-SOIC surface mount package. This single-circuit linear amplifier is designed for applications requiring high-speed signal conditioning with low input bias current and wide supply voltage range. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain functional compatibility while meeting application requirements.

Substiute Parts

OPA355UA/2K5G4

Texas InstrumentsIn Stock: 900OPA355UA/2K5G4 Datasheet

Current PartRFQ

OPA355UA/2K5

Texas InstrumentsIn Stock: 4811OPA355UA/2K5 Datasheet

Parametric EquivalentRFQ

AD8063ARZ

Analog Devices Inc.In Stock: 6160AD8063ARZ Datasheet

MFR RecommendedRFQ

AD8063ARZ-REEL7

Analog Devices Inc.In Stock: 1621AD8063ARZ-REEL7 Datasheet

MFR RecommendedRFQ

MAX4041ESA+

Analog Devices Inc./Maxim IntegratedIn Stock: 3087MAX4041ESA+ Datasheet

MFR RecommendedRFQ

MAX4041ESA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 2255MAX4041ESA+T Datasheet

MFR RecommendedRFQ

MAX4241ESA+

Analog Devices Inc./Maxim IntegratedIn Stock: 1500MAX4241ESA+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA355UA/2K5G4 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Package type: 8-SOIC surface mount form factor
• Output configuration: Rail-to-rail output
• Single circuit configuration
• Supply voltage range compatibility: minimum 2.7 V, maximum 5.5 V
• Operating temperature range: -40°C to 125°C (or subset thereof)
• RoHS3 compliance

Secondary Electrical Parameters for Functional Equivalence:

• Slew rate: 360 V/µs or greater
• Gain bandwidth product: 200 MHz or greater
• -3dB bandwidth: 450 MHz or greater
• Input bias current: 3 pA or lower
• Input offset voltage: 2 mV or lower
• Output current capability: 100 mA or greater per channel
• Supply current: 8.3 mA or lower

Substitute parts are grouped based on whether they meet all primary criteria and maintain compatibility with the secondary electrical parameters within acceptable engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

Tier 1: Direct Parametric Equivalent

OPA355UA/2K5 is the direct parametric equivalent to OPA355UA/2K5G4. This part maintains identical electrical specifications across all measured parameters and differs only in packaging format (Cut Tape & Digi-Reel® versus the original Digi-Reel® format). Both parts are ROHS3 compliant and manufactured by Texas Instruments. The OPA355UA/2K5 is currently in active product status with 4730 units in stock, providing immediate availability for replacement applications.

Tier 2: Functional Substitutes with Performance Trade-offs

AD8063ARZ and AD8063ARZ-REEL7 are voltage feedback amplifiers that maintain 8-SOIC package compatibility and rail-to-rail output configuration. These parts exceed the slew rate specification (650 V/µs versus 360 V/µs) but operate at reduced -3dB bandwidth (320 MHz versus 450 MHz). Input bias current is significantly higher (3.5 µA versus 3 pA), which may impact precision applications. Maximum supply voltage extends to 8 V, providing broader supply compatibility. Operating temperature range is limited to -40°C to 85°C. Both variants are ROHS3 compliant with MSL 1 rating. AD8063ARZ is available in tube packaging (6100 units), while AD8063ARZ-REEL7 is supplied on cut tape and reel (1600 units).

Tier 3: Limited Substitutes for Low-Speed Applications

MAX4041ESA+, MAX4041ESA+T, and MAX4241ESA+ are general-purpose amplifiers in 8-SOIC packages with rail-to-rail output. These parts are not suitable for high-frequency applications due to significantly reduced slew rate (0.04 V/µs) and gain bandwidth product (90 kHz). Output current capability is limited to 2.5 mA per channel, insufficient for the original 100 mA specification. These parts are appropriate only for low-frequency signal conditioning applications. MAX4241ESA+ extends minimum supply voltage to 1.8 V. All three variants are ROHS3 compliant with MSL 1 rating and active product status.

Compliance and Certification Summary

All substitute parts maintain ROHS3 compliance and REACH unaffected status. Moisture sensitivity levels for Analog Devices and Maxim parts (MSL 1, Unlimited) provide superior handling characteristics compared to the original part (MSL 2, 1 Year). ECCN and HTSUS classifications remain consistent across all listed parts.

Frequently Asked Questions (FAQ)

Q: Can OPA355UA/2K5 be used as a direct replacement for OPA355UA/2K5G4?

A: Yes. OPA355UA/2K5 is a direct parametric equivalent with identical electrical specifications. The difference is packaging format only. Both parts are manufactured by Texas Instruments and are ROHS3 compliant. OPA355UA/2K5 is currently in active production status.

Q: What are the key differences between the OPA355 and AD8063 substitutes?

A: The AD8063 series uses voltage feedback topology versus CMOS topology in the OPA355. The AD8063 provides higher slew rate (650 V/µs) but lower bandwidth (320 MHz). Input bias current is significantly higher (3.5 µA versus 3 pA), which affects precision applications. Output current is reduced to 50 mA. Operating temperature range is limited to -40°C to 85°C versus -40°C to 125°C for the OPA355.

Q: Are the MAX4041 and MAX4241 parts suitable replacements?

A: MAX4041 and MAX4241 parts are not suitable for applications requiring the OPA355's high-frequency performance. These general-purpose amplifiers operate at 90 kHz gain bandwidth product and 0.04 V/µs slew rate, making them appropriate only for low-frequency signal conditioning. Output current capability (2.5 mA) is insufficient for applications requiring 100 mA output.

Q: What is the significance of the 8-SOIC package specification?

A: The 8-SOIC (0.154", 3.90mm Width) package is a standard surface mount form factor. All listed substitute parts use this identical package, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes. No board redesign is required when substituting between parts with this package specification.

Q: How does operating temperature range affect substitution decisions?

A: The original OPA355UA/2K5G4 operates from -40°C to 125°C. Substitute parts from Analog Devices and Maxim are limited to -40°C to 85°C. Applications requiring operation above 85°C must use the OPA355UA/2K5 equivalent. For applications within the -40°C to 85°C range, all listed substitutes are temperature-compatible.

Q: What is the difference between AD8063ARZ and AD8063ARZ-REEL7?

A: Both parts are electrically identical. AD8063ARZ is supplied in tube packaging (6100 units available), while AD8063ARZ-REEL7 is supplied on cut tape and reel (1600 units available). Selection depends on assembly process requirements and inventory management preferences.

Q: Why is input bias current important in substitution decisions?

A: Input bias current affects circuit precision and noise performance. The OPA355 specifies 3 pA input bias current. The AD8063 series specifies 3.5 µA, which is approximately 1000 times higher. For precision instrumentation and low-noise applications, this difference is significant. The MAX40xx series specifies 2 nA, which is lower than the OPA355 but uses different amplifier topology affecting overall performance.

Q: Are all listed parts RoHS3 compliant?

A: Yes. All parts listed—OPA355UA/2K5, AD8063ARZ, AD8063ARZ-REEL7, MAX4041ESA+, MAX4041ESA+T, and MAX4241ESA+—are ROHS3 compliant. All are REACH unaffected and classified as EAR99 for export control purposes.