OPA277UG4 Equivalent & Substitute Parts

Part Overview

The OPA277UG4 is a general-purpose operational amplifier manufactured by Texas Instruments, packaged in 8-SOIC surface mount configuration. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design support and procurement. The OPA277UG4 delivers 1 MHz gain-bandwidth product with low input offset voltage of 10 µV, making it suitable for precision analog signal conditioning applications. Active alternatives ensure design continuity and supply chain reliability.

Key Parameters

Parameter	OPA277UG4 Value	Unit	Substitution Relevance
Amplifier Type	General Purpose	—	Core functional classification
Number of Circuits	1	—	Channel count must match
Slew Rate	0.8	V/µs	Transient response capability
Gain Bandwidth Product	1	MHz	Frequency response specification
Current - Input Bias	500	pA	Input impedance characteristic
Voltage - Input Offset	10	µV	DC accuracy specification
Current - Supply	790	µA	Power consumption
Current - Output / Channel	35	mA	Output drive capability
Voltage - Supply Span (Min)	4	V	Minimum operating voltage
Voltage - Supply Span (Max)	36	V	Maximum operating voltage
Operating Temperature	-40 to 85	°C	Thermal operating range
Package / Case	8-SOIC (0.154", 3.90mm Width)	—	PCB footprint compatibility
Mounting Type	Surface Mount	—	Assembly process compatibility
RoHS Status	ROHS3 Compliant	—	Environmental compliance
Moisture Sensitivity Level	3 (168 Hours)	—	Handling and storage requirements

Substitute Part Grouping Explanation

Substitution of the OPA277UG4 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Electrical Compatibility Requirements:

Amplifier type classification (General Purpose, Instrumentation, or Zero-Drift)
Single-circuit configuration (1 channel)
Gain-bandwidth product of 1 MHz or higher
Supply voltage range encompassing 4 V to 36 V minimum
Input offset voltage of 10 µV or lower
Operating temperature range including -40°C to 85°C

Mechanical Compatibility Requirements:

8-SOIC package footprint (0.154", 3.90mm Width)
Surface mount mounting type
ROHS3 compliance

Substitute Categories:

Category 1: Direct General-Purpose Equivalents (Identical Amplifier Type) OPA277U represents the active equivalent with identical electrical specifications and packaging. This part maintains the same general-purpose amplifier classification and all key performance parameters.

Category 2: Instrumentation Amplifier Substitutes (Enhanced Performance) LT1167 series devices (LT1167CS8#PBF, LT1167CS8#TRPBF, LT1167IS8#PBF, LT1167IS8#TR, LT1167IS8#TRPBF) provide instrumentation-grade amplification with superior input bias current (80 pA versus 500 pA) and higher slew rate (1.2 V/µs versus 0.8 V/µs). These devices maintain 1 MHz gain-bandwidth product and 8-SOIC packaging but operate within 0°C to 70°C or -40°C to 85°C temperature ranges.

Category 3: Zero-Drift Amplifier Substitute (Advanced Performance) NCS21911SN2T1G offers zero-drift amplification with superior input offset voltage (1 µV versus 10 µV) and higher gain-bandwidth product (2 MHz). However, this device uses 5-TSOP packaging, requiring PCB redesign.

Category 4: General-Purpose Alternatives (Lower Performance) OP177FSZ, OP177FSZ-REEL, and OP177FSZ-REEL7 provide general-purpose amplification with lower slew rate (0.3 V/µs) and gain-bandwidth product (600 kHz), requiring minimum 6 V supply voltage. These devices are suitable only for applications with relaxed frequency response requirements.

Parameter Comparison

Parameter	OPA277UG4	OPA277U	LT1167CS8#PBF	LT1167IS8#TRPBF	NCS21911SN2T1G	OP177FSZ-REEL7
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	onsemi	Analog Devices Inc.
Amplifier Type	General Purpose	General Purpose	Instrumentation	Instrumentation	Zero-Drift	General Purpose
Product Status	Obsolete	Active	Active	Active	Active	Active
Number of Circuits	1	1	1	1	1	1
Slew Rate (V/µs)	0.8	0.8	1.2	1.2	1.6	0.3
Gain Bandwidth Product (MHz)	1	1	1	1	2	0.6
Current - Input Bias (pA)	500	500	80	80	100	1200
Voltage - Input Offset (µV)	10	10	20	20	1	10
Current - Supply (µA)	790	790	900	900	475	1600
Current - Output / Channel (mA)	35	35	—	27	18	—
Voltage - Supply Span Min (V)	4	4	4.6	4.6	4	6
Voltage - Supply Span Max (V)	36	36	36	36	36	36
Operating Temperature (°C)	-40 to 85	-40 to 85	0 to 70	-40 to 85	-40 to 125	-40 to 85
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	5-TSOP	8-SOIC
RoHS Status	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)

Engineering Selection Recommendations

Primary Recommendation: OPA277U

OPA277U is the manufacturer-recommended direct equivalent for OPA277UG4. This active component maintains identical electrical specifications, packaging, and thermal operating range (-40°C to 85°C). The primary distinction is packaging format (tube versus reel), which does not affect electrical performance. OPA277U is ROHS3 compliant with unlimited moisture sensitivity level, providing superior handling characteristics compared to the obsolete OPA277UG4. Inventory availability of 9050 pieces ensures supply continuity.

Secondary Recommendation: LT1167IS8#TRPBF

LT1167IS8#TRPBF provides instrumentation-grade amplification with enhanced performance characteristics. This device maintains the full -40°C to 85°C operating temperature range and 8-SOIC packaging. Superior input bias current (80 pA) and higher slew rate (1.2 V/µs) support applications requiring improved signal fidelity. Moisture sensitivity level 1 (unlimited) reduces handling constraints. Inventory of 2363 pieces supports production requirements. Selection requires verification that instrumentation amplifier topology meets circuit requirements.

Tertiary Recommendation: NCS21911SN2T1G

NCS21911SN2T1G offers zero-drift amplification with exceptional input offset voltage (1 µV) and extended operating temperature range (-40°C to 125°C). This device requires PCB redesign due to 5-TSOP packaging incompatibility with 8-SOIC footprint. Selection is appropriate only for applications requiring superior DC accuracy and thermal performance, with design resources available for layout modification.

Not Recommended: OP177FSZ Series

OP177FSZ, OP177FSZ-REEL, and OP177FSZ-REEL7 devices exhibit reduced performance specifications (0.3 V/µs slew rate, 600 kHz gain-bandwidth product) and higher minimum supply voltage requirement (6 V). These devices are suitable only for legacy designs with relaxed frequency response requirements and are not recommended for new designs replacing OPA277UG4.

Frequently Asked Questions (FAQ)

Q1: Can OPA277U directly replace OPA277UG4 without circuit modification?

A: Yes. OPA277U maintains identical electrical specifications, supply voltage range (4 V to 36 V), operating temperature range (-40°C to 85°C), and 8-SOIC packaging. The only difference is packaging format (tube versus reel), which does not affect electrical performance or PCB assembly compatibility.

Q2: What is the primary advantage of LT1167 instrumentation amplifier substitutes over OPA277U?

A: LT1167 devices provide superior input bias current (80 pA versus 500 pA) and higher slew rate (1.2 V/µs versus 0.8 V/µs). These characteristics reduce input impedance loading effects and improve transient response. However, LT1167 devices operate within 0°C to 70°C (LT1167CS8 series) or -40°C to 85°C (LT1167IS8 series) temperature ranges. Selection requires confirmation that instrumentation amplifier topology is compatible with circuit requirements.

Q3: Why is NCS21911SN2T1G not a direct substitute despite superior specifications?

A: NCS21911SN2T1G uses 5-TSOP packaging, which is incompatible with the 8-SOIC footprint of OPA277UG4. PCB redesign is required to accommodate the different pin configuration and package dimensions. Selection is appropriate only when design resources support layout modification and superior DC accuracy (1 µV input offset voltage) justifies the redesign effort.

Q4: What are the supply voltage compatibility constraints for substitute selection?

A: OPA277UG4 operates within 4 V to 36 V supply range. OPA277U maintains this range. LT1167 devices require minimum 4.6 V supply voltage, which may be incompatible with 4 V to 4.6 V supply designs. OP177FSZ series requires minimum 6 V supply voltage, eliminating compatibility with designs operating below 6 V. Verify circuit supply voltage before substitute selection.

Q5: How do moisture sensitivity levels affect component handling and storage?

A: OPA277UG4 has moisture sensitivity level 3 (168 hours), requiring controlled humidity storage and bake-out procedures before reflow soldering. OPA277U, LT1167 series, and NCS21911SN2T1G have moisture sensitivity level 1 (unlimited), eliminating special storage requirements and reducing manufacturing process constraints. This represents a significant advantage for supply chain management and assembly operations.

Q6: Are all substitute parts ROHS3 compliant?

A: Yes. OPA277U, all LT1167 variants, NCS21911SN2T1G, and OP177FSZ series are ROHS3 compliant. Environmental compliance is maintained across all substitute options.

Q7: What is the inventory status for each substitute part?

A: OPA277U: 9050 pieces. LT1167CS8#PBF: 3600 pieces. LT1167CS8#TRPBF: 300,300 pieces. LT1167IS8#PBF: 2100 pieces. LT1167IS8#TR: 699 pieces. LT1167IS8#TRPBF: 2363 pieces. NCS21911SN2T1G: 3200 pieces. OP177FSZ: 7795 pieces. OP177FSZ-REEL: 7313 pieces. OP177FSZ-REEL7: 16,400 pieces. Inventory levels support production requirements across all substitute categories.

Q8: Can OP177FSZ series devices be used in high-frequency applications?

A: No. OP177FSZ series devices have 600 kHz gain-bandwidth product and 0.3 V/µs slew rate, which are insufficient for applications requiring 1 MHz bandwidth or higher transient response. These devices are suitable only for low-frequency signal conditioning applications with relaxed performance requirements.

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