OPA27GUE4 Equivalent & Substitute Parts

Part Overview

The OPA27GUE4 is a general-purpose operational amplifier manufactured by Texas Instruments, packaged in 8-SOIC surface-mount configuration. This device is classified as obsolete product status, necessitating identification of active equivalent and substitute components for ongoing design requirements and production continuity. The OPA27GUE4 delivers 1 circuit with 8 MHz gain-bandwidth product and operates across an 8V to 44V supply span, making it suitable for precision analog signal conditioning applications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Slew Rate	1.9	V/µs
Gain Bandwidth Product	8	MHz
Current - Input Bias	15	nA
Voltage - Input Offset	25	µV
Current - Supply	3.3	mA
Current - Output / Channel	25	mA
Voltage - Supply Span (Min)	8	V
Voltage - Supply Span (Max)	44	V
Operating Temperature Range	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	3 (168 Hours)	—

Substitute Part Grouping Explanation

Substitution of the OPA27GUE4 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Amplifier Type (General Purpose vs. Instrumentation)
Slew Rate (minimum 1.9 V/µs for direct replacement)
Gain Bandwidth Product (minimum 8 MHz for direct replacement)
Input Bias Current (maximum 15 nA for direct replacement)
Input Offset Voltage (maximum 25 µV for direct replacement)
Supply Current (maximum 3.3 mA for direct replacement)
Output Current per Channel (minimum 25 mA for direct replacement)
Voltage Supply Span compatibility (minimum 8V to 44V overlap)
Operating Temperature Range (minimum -40°C to 85°C coverage)

Mechanical Compatibility Criteria:

Package Type: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Pin configuration compatibility

Compliance Criteria:

RoHS3 Compliance
REACH Unaffected status

Substitute parts are grouped into two categories:

Category 1 - Direct Electrical Equivalents (Active Status): Parts meeting all electrical parameters within specified tolerances while maintaining active product status. OPA27GU represents the direct equivalent with identical electrical specifications but active manufacturing status.

Category 2 - Functional Alternatives (Active Status): Parts with different amplifier types or modified electrical characteristics that operate within the 8-SOIC package and maintain compatibility with the mechanical and thermal envelope. These include rail-to-rail output variants and instrumentation amplifier configurations.

Parameter Comparison

Parameter	OPA27GUE4	OPA27GU	LT1677CS8#TRPBF	LT1677IS8#TRPBF	LT1012S8#TRPBF	OP184ESZ-REEL7	AD8229HRZ
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	Instrumentation
Number of Circuits	1	1	1	1	1	1	1
Output Type	—	—	Rail-to-Rail	Rail-to-Rail	—	Rail-to-Rail	—
Slew Rate (V/µs)	1.9	1.9	2.5	2.5	0.2	4	22
Gain Bandwidth Product (MHz)	8	8	7.2	7.2	—	4.25	15
Current - Input Bias (nA)	15	15	2	2	0.025	80	70
Voltage - Input Offset (µV)	25	25	20	20	8	100	100
Current - Supply (mA)	3.3	3.3	2.75	2.75	0.38	2.25	6.7
Current - Output / Channel (mA)	25	—	35	35	—	10	35
Voltage - Supply Span Min (V)	8	8	3	3	2.4	3	8
Voltage - Supply Span Max (V)	44	44	36	36	40	36	34
Operating Temperature (°C)	-40 to 85	-40 to 85	0 to 70	-40 to 85	0 to 70	-40 to 125	-40 to 175
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: OPA27GU

The OPA27GU is the manufacturer-recommended direct equivalent to the obsolete OPA27GUE4. This part maintains identical electrical specifications including 1.9 V/µs slew rate, 8 MHz gain-bandwidth product, 15 nA input bias current, and 25 µV input offset voltage. The OPA27GU operates across the full 8V to 44V supply span and maintains the -40°C to 85°C operating temperature range. Active product status ensures ongoing availability and manufacturing support. Both parts are ROHS3 compliant and REACH unaffected. The primary distinction is packaging format: OPA27GU is supplied in Tube packaging versus the OPA27GUE4 original packaging designation.

Secondary Recommendations: LT1677 Series (Rail-to-Rail Output Variants)

The LT1677IS8#TRPBF and LT1677IS8#PBF variants provide active product status with enhanced operating temperature coverage (-40°C to 85°C). These parts feature rail-to-rail output capability, improved slew rate (2.5 V/µs), and lower input bias current (2 nA). The LT1677 series operates across 3V to 36V supply span, which does not fully encompass the OPA27GUE4 maximum 44V specification. The LT1677CS8#TRPBF variant operates only across 0°C to 70°C temperature range and is not recommended for full temperature coverage applications.

Alternative Consideration: OP184ESZ-REEL7

The OP184ESZ-REEL7 provides active product status with extended operating temperature range (-40°C to 125°C) and rail-to-rail output. This part operates across 3V to 36V supply span and exhibits higher slew rate (4 V/µs) but reduced output current per channel (10 mA versus 25 mA). The OP184ESZ-REEL7 is suitable for applications where extended temperature operation and rail-to-rail output are required, provided the 36V maximum supply voltage and 10 mA output current limitations are acceptable.

Not Recommended: LT1012S8#TRPBF

The LT1012S8#TRPBF exhibits significantly reduced slew rate (0.2 V/µs) and operates only across 0°C to 70°C temperature range, failing to meet the OPA27GUE4 performance and temperature specifications.

Not Recommended: AD8229HRZ

The AD8229HRZ is an instrumentation amplifier with different circuit topology and application focus. While it provides active status and extended temperature range (-40°C to 175°C), the instrumentation amplifier architecture differs fundamentally from the general-purpose amplifier topology of the OPA27GUE4.

Frequently Asked Questions (FAQ)

Q: Can OPA27GU directly replace OPA27GUE4 in existing designs?

A: Yes. The OPA27GU maintains identical electrical specifications and operates across the same supply voltage range (8V to 44V) and temperature range (-40°C to 85°C). Both parts are packaged in 8-SOIC surface-mount configuration with identical pin assignments. The primary difference is packaging format (Tube versus original designation). Pin-for-pin compatibility is confirmed.

Q: What is the key limitation of LT1677 series substitutes?

A: The LT1677 series maximum supply voltage is 36V, which does not accommodate the OPA27GUE4 maximum specification of 44V. Applications requiring operation above 36V supply voltage cannot use LT1677 variants. Additionally, the LT1677CS8#TRPBF variant operates only across 0°C to 70°C and does not meet the full -40°C to 85°C temperature requirement.

Q: Why is the AD8229HRZ not a direct substitute?

A: The AD8229HRZ is an instrumentation amplifier, not a general-purpose operational amplifier. Instrumentation amplifiers feature integrated gain-setting resistors and different input stage architecture optimized for differential signal measurement. The OPA27GUE4 is a general-purpose amplifier suitable for inverting, non-inverting, and summing configurations. Circuit topology differences prevent direct substitution.

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

A: The OPA27GUE4 specifies MSL 3 (168 Hours), indicating moisture sensitivity requiring controlled storage and handling. Substitute parts with MSL 1 (Unlimited) offer superior moisture tolerance and reduced risk of moisture-induced failures during storage and assembly. MSL 1 rated parts provide manufacturing flexibility without moisture bake-out requirements.

Q: Can OP184ESZ-REEL7 be used in applications requiring 44V supply operation?

A: No. The OP184ESZ-REEL7 maximum supply voltage is 36V. Applications requiring operation at voltages between 36V and 44V cannot use this substitute. The OPA27GU remains the only active substitute maintaining full 44V maximum supply voltage compatibility.

Q: What output current capability differences exist between substitutes?

A: The OPA27GUE4 specifies 25 mA output current per channel. The LT1677 series provides 35 mA output current, exceeding the original specification. The OP184ESZ-REEL7 provides only 10 mA output current, which is insufficient for applications requiring the full 25 mA output capability. Applications with output current requirements between 10 mA and 25 mA can use OP184ESZ-REEL7; applications requiring 25 mA or greater must use OPA27GU or LT1677 variants.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance profile of the OPA27GUE4.

Q: What is the operating temperature range limitation of LT1677CS8#TRPBF?

A: The LT1677CS8#TRPBF operates across 0°C to 70°C, which does not encompass the OPA27GUE4 full range of -40°C to 85°C. This variant is not suitable for applications requiring operation below 0°C or above 70°C. The LT1677IS8#TRPBF and LT1677IS8#PBF variants extend the range to -40°C to 85°C and are preferred for full temperature coverage.

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