OPA27GUG4 Equivalent & Substitute Parts

Part Overview

The OPA27GUG4 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, indicating it is no longer in active production. The OPA27GUG4 delivers 1 circuit with a gain bandwidth product of 8 MHz and operates across a wide supply voltage range of 8V to 44V, making it suitable for precision analog signal conditioning applications.

Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, procurement reliability, and long-term system support. Active alternative components with comparable electrical characteristics and identical packaging are available from both Texas Instruments and Analog Devices Inc.

Key Parameters

Parameter	OPA27GUG4 Value	Unit	Substitution Relevance
Amplifier Type	General Purpose	—	Core functional classification
Number of Circuits	1	—	Channel count must match
Slew Rate	1.9	V/µs	Signal fidelity and bandwidth capability
Gain Bandwidth Product	8	MHz	Frequency response and gain-bandwidth tradeoff
Current - Input Bias	15	nA	Input impedance and offset current effects
Voltage - Input Offset	25	µV	DC accuracy and precision requirements
Current - Supply	3.3	mA	Power consumption and thermal design
Voltage - Supply Span (Min)	8	V	Minimum operating voltage requirement
Voltage - Supply Span (Max)	44	V	Maximum operating voltage rating
Operating Temperature	-40 to 85	°C	Environmental operating range
Package / Case	8-SOIC (0.154", 3.90mm Width)	—	PCB footprint and mechanical compatibility
Mounting Type	Surface Mount	—	Assembly process compatibility
Product Status	Obsolete	—	Availability and long-term support

Substitute Part Grouping Explanation

Substitution of the OPA27GUG4 is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitute relationships:

Primary Substitution Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — identical footprint required
Mounting Type: Surface Mount — assembly process compatibility
Number of Circuits: 1 — single amplifier channel
Amplifier Type: General Purpose — functional classification match

Secondary Electrical Criteria:

Gain Bandwidth Product: 8 MHz nominal (7.2 MHz to 12 MHz acceptable range)
Slew Rate: 1.9 V/µs minimum (higher values acceptable)
Current - Input Bias: 15 nA nominal (2 nA to 80 nA acceptable range)
Voltage - Input Offset: 25 µV nominal (20 µV to 100 µV acceptable range)
Current - Supply: 3.3 mA nominal (2.25 mA to 3.3 mA acceptable range)
Voltage - Supply Span: Minimum 8V, Maximum 44V (or compatible subset)
Operating Temperature: -40°C to 85°C minimum coverage

Compliance Requirements:

RoHS3 Compliant status required
REACH Unaffected status required
ECCN: EAR99 classification maintained

Substitute parts are grouped into two categories: direct pin-compatible replacements (OPA27GU) and functionally equivalent alternatives with enhanced specifications (LT1677 series, ADA4004-1ARZ, OP184 series, OP27GSZ).

Parameter Comparison

Parameter	OPA27GUG4	OPA27GU	ADA4004-1ARZ	LT1677CS8#PBF	LT1677CS8#TRPBF	LT1677IS8#PBF	LT1677IS8#TRPBF	OP184ESZ	OP184ESZ-REEL	OP184ESZ-REEL7	OP27GSZ
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1	1	1	1	1	1	1
Slew Rate (V/µs)	1.9	1.9	2.7	2.5	2.5	2.5	2.5	4.0	4.0	4.0	2.8
Gain Bandwidth Product (MHz)	8	8	12	7.2	7.2	7.2	7.2	4.25	4.25	4.25	8
Current - Input Bias (nA)	15	15	40	2	2	2	2	80	80	80	15
Voltage - Input Offset (µV)	25	25	40	20	20	20	20	100	100	100	30
Current - Supply (mA)	3.3	3.3	2.2	2.75	2.75	2.75	2.75	2.25	2.25	2.25	—
Voltage - Supply Span Min (V)	8	8	10	3	3	3	3	3	3	3	8
Voltage - Supply Span Max (V)	44	44	36	36	36	36	36	36	36	36	36
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 125	0 to 70	0 to 70	-40 to 85	-40 to 85	-40 to 125	-40 to 125	-40 to 125	-40 to 85
Output Type	—	—	—	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	—
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS3 Compliant	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes

Engineering Selection Recommendations

Tier 1: Direct Replacement (Highest Compatibility)

OPA27GU represents the primary substitute for OPA27GUG4. Both devices share identical electrical specifications (1.9 V/µs slew rate, 8 MHz gain bandwidth product, 15 nA input bias current, 25 µV input offset voltage, 3.3 mA supply current) and operate across the same supply voltage range (8V to 44V). OPA27GU maintains active product status with ROHS3 compliance and REACH unaffected certification. The only difference is packaging format (Tube vs. unspecified for OPA27GUG4). This part is recommended for direct pin-for-pin replacement in existing designs.

Tier 2: Enhanced Performance Alternatives (Electrical Compatibility)

OP27GSZ (Analog Devices Inc.) provides equivalent functionality with improved slew rate (2.8 V/µs vs. 1.9 V/µs) while maintaining 8 MHz gain bandwidth product and 15 nA input bias current. Operating temperature range matches (-40°C to 85°C). Supply voltage range is 8V to 36V, which covers the OPA27GUG4 operating window. Active product status with ROHS3 compliance and unlimited MSL rating. Suitable for applications requiring faster signal transitions.

LT1677 series (LT1677CS8#PBF, LT1677CS8#TRPBF, LT1677IS8#PBF, LT1677IS8#TRPBF) offers rail-to-rail output capability with 2.5 V/µs slew rate and 7.2 MHz gain bandwidth product. Input bias current is significantly lower (2 nA). Supply voltage minimum is reduced to 3V, expanding application flexibility. Operating temperature variants available: 0°C to 70°C (commercial) and -40°C to 85°C (industrial). All variants maintain ROHS3 compliance with unlimited MSL rating. Recommended for low-power applications or designs requiring rail-to-rail output swing.

ADA4004-1ARZ (Analog Devices Inc., iPolar® series) delivers enhanced specifications with 2.7 V/µs slew rate and 12 MHz gain bandwidth product. Input bias current is 40 nA. Supply voltage range is 10V to 36V. Operating temperature extends to 125°C. ROHS3 compliant with MSL 1 rating. Suitable for high-temperature environments and applications requiring higher bandwidth.

Tier 3: Lower Bandwidth Alternatives (Reduced Performance)

OP184 series (OP184ESZ, OP184ESZ-REEL, OP184ESZ-REEL7) features rail-to-rail output with 4.0 V/µs slew rate but reduced gain bandwidth product (4.25 MHz). Input bias current is higher (80 nA). Supply voltage range is 3V to 36V. Operating temperature extends to 125°C. All variants maintain ROHS3 compliance with unlimited MSL rating. These parts are suitable only for applications where lower bandwidth is acceptable and extended temperature range is required.

Compliance and Certification Status:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original OPA27GUG4. Moisture sensitivity levels range from 1 (unlimited) to 3 (168 hours), with most active alternatives offering superior MSL ratings.

Frequently Asked Questions (FAQ)

Q1: Can OPA27GU directly replace OPA27GUG4 without circuit modifications?

A: Yes. OPA27GU is a direct pin-compatible replacement with identical electrical specifications across all critical parameters: slew rate (1.9 V/µs), gain bandwidth product (8 MHz), input bias current (15 nA), input offset voltage (25 µV), supply current (3.3 mA), and operating temperature range (-40°C to 85°C). The 8-SOIC package footprint is identical. No circuit modifications are required.

Q2: What is the key difference between OPA27GUG4 and LT1677 series substitutes?

A: The primary differences are output type and supply voltage range. LT1677 devices feature rail-to-rail output capability, allowing output swing to ground and supply rails, whereas OPA27GUG4 has standard output. LT1677 minimum supply voltage is 3V (vs. 8V for OPA27GUG4), enabling low-voltage applications. Input bias current is significantly lower in LT1677 (2 nA vs. 15 nA). Operating temperature range for commercial variants (LT1677CS8) is 0°C to 70°C, narrower than OPA27GUG4. Industrial variants (LT1677IS8) extend to -40°C to 85°C, matching the original.

Q3: Why does OP184 series show lower gain bandwidth product (4.25 MHz) compared to OPA27GUG4 (8 MHz)?

A: OP184 is optimized for low-power operation (2.25 mA supply current) and extended temperature range (-40°C to 125°C) with rail-to-rail output capability. The reduced gain bandwidth product reflects this design tradeoff. OP184 is suitable only for applications where lower bandwidth is acceptable. For bandwidth-critical designs, OPA27GU or OP27GSZ are preferred.

Q4: Can I use ADA4004-1ARZ in place of OPA27GUG4 in a circuit designed for 44V maximum supply?

A: No. ADA4004-1ARZ has a maximum supply voltage rating of 36V, which is below the OPA27GUG4 maximum of 44V. Using ADA4004-1ARZ in a circuit designed for 44V operation would violate the device absolute maximum ratings and create reliability risk. For applications requiring 44V operation, OPA27GU or OP27GSZ must be used.

Q5: What is the significance of MSL (Moisture Sensitivity Level) ratings in substitute selection?

A: MSL rating indicates the maximum time a component can be exposed to ambient conditions (typically 30°C, 85% relative humidity) before soldering. OPA27GUG4 has MSL 3 (168 hours). Most active substitutes have MSL 1 (unlimited), providing superior shelf life and storage flexibility. Lower MSL ratings reduce risk of moisture-induced failures during manufacturing and storage. For high-volume production or extended inventory holding, parts with MSL 1 are preferred.

Q6: Are all substitute parts available in both Tube and Tape & Reel packaging?

A: No. Packaging availability varies by part number. OPA27GU is available in Tube. LT1677 series offers both Tube (CS8#PBF, IS8#PBF) and Tape & Reel (CS8#TRPBF, IS8#TRPBF) variants. OP184ESZ is available in Tube; OP184ESZ-REEL and OP184ESZ-REEL7 are reel formats. OP27GSZ is available in Tube. Packaging selection depends on assembly process requirements and inventory management practices.

Q7: Which substitute offers the best low-power performance?

A: ADA4004-1ARZ delivers the lowest supply current at 2.2 mA, compared to OPA27GUG4 at 3.3 mA. LT1677 series follows closely at 2.75 mA. OP184 series consumes 2.25 mA. For battery-powered or energy-constrained applications, ADA4004-1ARZ or OP184 series are optimal choices.

Q8: What is the operating temperature range consideration for industrial applications?

A: OPA27GUG4 operates from -40°C to 85°C. Substitutes with matching or extended ranges include OPA27GU (-40°C to 85°C), LT1677IS8 variants (-40°C to 85°C), OP184 series (-40°C to 125°C), and OP27GSZ (-40°C to 85°C). For applications exceeding 85°C, OP184 or ADA4004-1ARZ (both -40°C to 125°C) are required. LT1677CS8 commercial variants (0°C to 70°C) are unsuitable for full industrial temperature range.

Q9: How do I verify electrical compatibility before substituting a part?

A: Verify compatibility by confirming: (1) Package / Case matches (8-SOIC required), (2) Gain bandwidth product is within acceptable range (7.2 MHz to 12 MHz acceptable for 8 MHz nominal), (3) Supply voltage range covers your application (minimum 8V, maximum 44V for OPA27GUG4), (4) Operating temperature range includes your environment, (5) Input bias current and offset voltage meet precision requirements, (6) Output type (rail-to-rail vs. standard) is compatible with circuit design. Cross-reference the datasheet electrical characteristics table for each candidate part.

Q10: Is there a performance advantage to using OP27GSZ over OPA27GU?

A: OP27GSZ offers improved slew rate (2.8 V/µs vs. 1.9 V/µs), enabling faster signal transitions and better high-frequency performance. Both maintain 8 MHz gain bandwidth product and 15 nA input bias current. OP27GSZ supply voltage range is 8V to 36V (vs. 8V to 44V for OPA27GU), which may be limiting in high-voltage applications. OP27GSZ is preferred for applications requiring faster settling time; OPA27GU is preferred for designs requiring 44V operation.

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