OPA2227UG4 Equivalent & Substitute Parts

Part Overview

The OPA2227UG4 is a general purpose operational amplifier featuring two circuits in an 8-SOIC surface mount package, manufactured by Texas Instruments. This device is classified as obsolete, which necessitates identification of active alternative components that maintain electrical and mechanical compatibility for ongoing production and maintenance applications. The OPA2227UG4 operates across a supply voltage range of 5V to 36V with a slew rate of 2.3V/µs and gain bandwidth product of 8 MHz, making it suitable for general purpose amplification circuits requiring low input bias current and minimal input offset voltage.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Slew Rate	2.3	V/µs
Gain Bandwidth Product	8	MHz
Current - Input Bias	2.5	nA
Voltage - Input Offset	5	µV
Current - Supply	3.7 (x2 Channels)	mA
Current - Output / Channel	45	mA
Voltage - Supply Span (Min)	5	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	2 (1 Year)	—

Substitute Part Grouping Explanation

Substitute parts for the OPA2227UG4 are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Amplifier Type: General Purpose
Number of Circuits: 2
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Supply Voltage Range: Minimum 5V, Maximum 36V (or compatible range)
Operating Temperature: -40°C to 85°C (or extended range)

Electrical Performance Parameters:

Slew Rate: 2.3V/µs or higher
Gain Bandwidth Product: 8 MHz or higher
Current - Input Bias: 2.5 nA or lower
Voltage - Input Offset: 5 µV or lower
Current - Output / Channel: 45 mA or higher

Substitute parts are grouped into two categories: direct replacements from Texas Instruments (OPA2227U) and cross-manufacturer alternatives (ISL28227 series from Renesas Electronics Corporation, LT1124 series from Analog Devices Inc., and LM833DT from STMicroelectronics). All substitute parts maintain the 8-SOIC package footprint and surface mount configuration, ensuring mechanical compatibility with existing PCB layouts.

Parameter Comparison

Part Number	Manufacturer	Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (µV)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package
OPA2227UG4	Texas Instruments	Obsolete	2.3	8	2.5	5	5	36	-40 to 85	8-SOIC
OPA2227U	Texas Instruments	Active	2.3	8	2.5	5	5	36	-40 to 85	8-SOIC
ISL28227FBZ	Renesas Electronics	Active	3.6	10	1	10	4.5	40	-40 to 125	8-SOIC
ISL28227FBZ-T13	Renesas Electronics	Active	3.6	10	1	10	4.5	40	-40 to 125	8-SOIC
ISL28227FBZ-T7	Renesas Electronics	Active	3.6	10	1	10	4.5	40	-40 to 125	8-SOIC
ISL28227FBZ-T7A	Renesas Electronics	Obsolete	3.6	10	1	10	4.5	40	-40 to 125	8-SOIC
LT1124AIS8#PBF	Analog Devices Inc.	Active	4.5	12.5	7	20	8	44	-40 to 85	8-SOIC
LT1124AIS8#TRPBF	Analog Devices Inc.	Active	4.5	12.5	7	20	8	44	-40 to 85	8-SOIC
LT1124AMPS8#PBF	Analog Devices Inc.	Active	4.5	12.5	7	20	8	44	-55 to 125	8-SOIC
LT1124AMPS8#TRPBF	Analog Devices Inc.	Active	4.5	12.5	7	20	8	44	-55 to 125	8-SOIC
LM833DT	STMicroelectronics	Active	7	15	300	300	5	30	-40 to 105	8-SOIC

Engineering Selection Recommendations

Primary Recommendation: OPA2227U

The OPA2227U from Texas Instruments is the direct active replacement for the obsolete OPA2227UG4. This part maintains identical electrical specifications across all critical parameters including slew rate, gain bandwidth product, input bias current, input offset voltage, and supply voltage range. The OPA2227U is classified as active with 5000 pieces in stock, ensuring long-term availability. Both parts are ROHS3 compliant and carry identical moisture sensitivity levels. Selection of OPA2227U eliminates any design re-qualification requirements and provides the most direct path for component substitution.

Secondary Recommendation: ISL28227FBZ Series (Renesas Electronics)

The ISL28227FBZ, ISL28227FBZ-T13, and ISL28227FBZ-T7 from Renesas Electronics Corporation provide enhanced electrical performance characteristics while maintaining 8-SOIC package compatibility. These parts exceed the OPA2227UG4 specifications in slew rate (3.6V/µs vs. 2.3V/µs), gain bandwidth product (10 MHz vs. 8 MHz), and supply voltage range (4.5V to 40V vs. 5V to 36V). The ISL28227 series demonstrates superior input bias current (1 nA vs. 2.5 nA) and extended operating temperature range (-40°C to 125°C vs. -40°C to 85°C). All ISL28227 variants are active products with substantial inventory availability. These parts are suitable for applications requiring enhanced performance margins and extended temperature operation.

Tertiary Recommendation: LT1124 Series (Analog Devices Inc.)

The LT1124AIS8#PBF, LT1124AIS8#TRPBF, LT1124AMPS8#PBF, and LT1124AMPS8#TRPBF from Analog Devices Inc. provide alternative general purpose amplifier solutions with improved slew rate (4.5V/µs) and gain bandwidth product (12.5 MHz). The LT1124AMPS8 variants offer extended operating temperature range (-55°C to 125°C), making them suitable for military and aerospace applications. These parts require minimum supply voltage of 8V, which may necessitate circuit design modifications in applications utilizing the full 5V to 36V range of the OPA2227UG4. All LT1124 variants are active products with strong inventory positions.

Alternative Consideration: LM833DT (STMicroelectronics)

The LM833DT is classified as an audio amplifier rather than a general purpose amplifier. While this part maintains 8-SOIC package compatibility and active product status, its higher input bias current (300 nA) and input offset voltage (300 µV) make it unsuitable for precision general purpose amplification applications. The LM833DT is recommended only for audio-specific applications where the OPA2227UG4 specifications are not critical.

All recommended substitute parts are ROHS3 compliant and carry EAR99 ECCN classification, maintaining regulatory compliance with the original component.

Frequently Asked Questions (FAQ)

Q1: Can OPA2227U be used as a direct replacement for OPA2227UG4 without circuit modifications?

A: Yes. The OPA2227U maintains identical electrical specifications and 8-SOIC package configuration. No circuit modifications are required. The primary difference is product status: OPA2227U is active while OPA2227UG4 is obsolete.

Q2: What are the key differences between OPA2227U and ISL28227FBZ?

A: Both parts are pin-compatible in 8-SOIC packages. The ISL28227FBZ offers superior performance: higher slew rate (3.6V/µs vs. 2.3V/µs), higher gain bandwidth product (10 MHz vs. 8 MHz), lower input bias current (1 nA vs. 2.5 nA), and extended operating temperature range (-40°C to 125°C vs. -40°C to 85°C). The ISL28227FBZ also supports a wider supply voltage range (4.5V to 40V vs. 5V to 36V). Selection depends on application performance requirements.

Q3: Are ISL28227FBZ-T13 and ISL28227FBZ-T7 electrically identical?

A: Yes. Both parts have identical electrical specifications. The suffix designations indicate packaging format: -T13 indicates Tape & Reel packaging, while -T7 indicates a different tape configuration. Selection between these variants depends on assembly process requirements and tape specifications.

Q4: Can LT1124AMPS8#PBF replace OPA2227UG4 in all applications?

A: LT1124AMPS8#PBF is electrically compatible but requires minimum supply voltage of 8V, compared to OPA2227UG4's 5V minimum. Applications operating at 5V to 7.9V supply voltage require circuit redesign or alternative component selection. For applications operating at 8V or higher, LT1124AMPS8#PBF provides enhanced performance with extended temperature range (-55°C to 125°C).

Q5: Why is LM833DT not recommended as a primary substitute?

A: LM833DT is classified as an audio amplifier with significantly degraded precision specifications: input bias current of 300 nA (vs. 2.5 nA for OPA2227UG4) and input offset voltage of 300 µV (vs. 5 µV). These characteristics make LM833DT unsuitable for general purpose precision amplification. Use LM833DT only in audio-specific applications where precision is not critical.

Q6: What is the difference between Tube and Tape & Reel packaging options?

A: Tube packaging (OPA2227U) is suitable for manual assembly and lower-volume production. Tape & Reel packaging (ISL28227FBZ-T13, ISL28227FBZ-T7, LT1124AIS8#TRPBF, LT1124AMPS8#TRPBF) is optimized for automated pick-and-place assembly equipment. Selection depends on manufacturing process capabilities. Both packaging formats contain identical components.

Q7: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant, maintaining regulatory compliance with the original OPA2227UG4 component.

Q8: What is the moisture sensitivity level (MSL) for substitute parts?

A: OPA2227U, ISL28227 series, and LT1124 series all carry MSL 2 (1 Year) rating, identical to OPA2227UG4. LM833DT carries MSL 1 (Unlimited). MSL ratings determine storage and handling requirements prior to assembly.

Q9: Which substitute part offers the best long-term availability?

A: OPA2227U from Texas Instruments is the recommended choice for long-term availability, as it is the direct active replacement manufactured by the original supplier. ISL28227FBZ series from Renesas Electronics also demonstrates strong inventory positions (9880 pieces available) and active product status.

Q10: Can multiple substitute parts be used interchangeably within the same production run?

A: OPA2227U and ISL28227FBZ series are pin-compatible and electrically interchangeable at the circuit level. However, LT1124 series requires minimum 8V supply voltage, making it incompatible with 5V applications. Mixing substitute parts within production runs requires verification that all parts meet the specific application's electrical requirements.

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