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OPA277UAG4 Equivalent & Substitute Parts
Part Overview
The OPA277UAG4 is a general purpose operational amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete product status, necessitating identification of active equivalent and substitute components for ongoing design requirements and procurement needs. The OPA277UAG4 serves applications requiring low-power, single-ended output amplification across industrial and commercial temperature ranges.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 1 | — |
| Output Type | Single-Ended | — |
| Slew Rate | 0.8 | V/µs |
| Gain Bandwidth Product | 1 | MHz |
| Current - Input Bias | 500 | pA |
| Voltage - Input Offset | 20 | µV |
| Current - Supply | 790 | µA |
| Voltage - Supply Span (Min) | 4 | V |
| Voltage - Supply Span (Max) | 36 | V |
| Operating Temperature | -40 to 85 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | — |
Substitute Part Grouping Explanation
Substitution of the OPA277UAG4 is determined by strict alignment of the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Amplifier Type classification (General Purpose, Instrumentation, or Zero-Drift)
- Number of Circuits (single circuit requirement)
- Package / Case format (8-SOIC or compatible 8-SO pinout)
- Voltage Supply Span compatibility (minimum 4V, maximum 36V overlap required)
- Operating Temperature range (-40°C to 85°C minimum coverage)
- Surface Mount mounting type
- RoHS3 compliance and MSL rating
Secondary Compatibility Parameters:
- Slew Rate (0.8 V/µs baseline)
- Gain Bandwidth Product (1 MHz baseline)
- Current - Input Bias (500 pA baseline)
- Voltage - Input Offset (20 µV baseline)
- Current - Supply (790 µA baseline)
Substitute parts are grouped into two categories: direct functional equivalents (OPA277UA) and alternative amplifier topologies (instrumentation amplifiers and zero-drift amplifiers) that maintain electrical and mechanical compatibility within the specified parameter ranges.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (pA) | Input Offset (µV) | Supply Current (µA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package | Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| OPA277UAG4 | Texas Instruments | General Purpose | 0.8 | 1 | 500 | 20 | 790 | 4 | 36 | -40 to 85 | 8-SOIC | Obsolete |
| OPA277UA | Texas Instruments | General Purpose | 0.8 | 1 | 500 | 20 | 790 | 4 | 36 | -40 to 85 | 8-SOIC | Active |
| AD8221ARZ-RL | Analog Devices Inc. | Instrumentation | 2 | 0.825 | 500 | 60 | 900 | 4.6 | 36 | -40 to 85 | 8-SOIC | Active |
| LT1012IS8#TRPBF | Analog Devices Inc. | General Purpose | 0.2 | — | 25 | 8 | 380 | 2.4 | 40 | -40 to 85 | 8-SOIC | Active |
| LT1167CS8#PBF | Analog Devices Inc. | Instrumentation | 1.2 | 1 | 80 | 20 | 900 | 4.6 | 36 | 0 to 70 | 8-SOIC | Active |
| LT1167CS8#TRPBF | Analog Devices Inc. | Instrumentation | 1.2 | 1 | 80 | 20 | 900 | 4.6 | 36 | 0 to 70 | 8-SOIC | Active |
| LT1167IS8#PBF | Analog Devices Inc. | Instrumentation | 1.2 | 1 | 80 | 20 | 900 | 4.6 | 36 | -40 to 85 | 8-SOIC | Active |
| LT1167IS8#TR | Analog Devices Inc. | Instrumentation | 1.2 | 1 | 80 | 20 | 900 | 4.6 | 36 | -40 to 85 | 8-SOIC | Active |
| LT1167IS8#TRPBF | Analog Devices Inc. | Instrumentation | 1.2 | 1 | 80 | 20 | 900 | 4.6 | 36 | -40 to 85 | 8-SOIC | Active |
| NCS21911SN2T1G | onsemi | Zero-Drift | 1.6 | 2 | 100 | 1 | 475 | 4 | 36 | -40 to 125 | 5-TSOP | Active |
| OP177GSZ | Analog Devices Inc. | General Purpose | 0.3 | 0.6 | 1200 | 20 | 1600 | 6 | 36 | -40 to 85 | 8-SOIC | Active |
Engineering Selection Recommendations
Direct Equivalent (Recommended Primary Substitute):
OPA277UA is the active production equivalent of OPA277UAG4. Both devices share identical electrical specifications, packaging format (8-SOIC), and operating temperature range (-40°C to 85°C). OPA277UA maintains ROHS3 compliance and is currently in active product status with 3960 pieces in stock inventory. This part provides seamless functional replacement without design modification.
Alternative Substitutes (Conditional Selection):
LT1167IS8#TRPBF and LT1167IS8#PBF are instrumentation amplifier variants manufactured by Analog Devices Inc. These parts maintain 8-SOIC packaging, identical supply voltage range (4.6V to 36V), and -40°C to 85°C operating temperature coverage. The LT1167 series exhibits improved slew rate (1.2 V/µs) and maintains 1 MHz gain bandwidth product. These devices are suitable for applications requiring instrumentation amplifier topology within the specified electrical envelope.
LT1012IS8#TRPBF is a general purpose amplifier offering extended supply voltage range (2.4V to 40V) and reduced supply current (380 µA). However, this device exhibits lower slew rate (0.2 V/µs) and requires minimum 2.4V supply, which may not align with all OPA277UAG4 application requirements.
OP177GSZ is a general purpose amplifier with identical input offset voltage (20 µV) and operating temperature range. However, this device requires minimum 6V supply voltage, exceeding the OPA277UAG4 minimum of 4V, and exhibits higher supply current (1.6 mA), limiting applicability to low-power designs.
NCS21911SN2T1G is a zero-drift amplifier in 5-TSOP package format. While this device offers superior input offset voltage (1 µV) and extended operating temperature (-40°C to 125°C), the package change from 8-SOIC to 5-TSOP requires PCB layout modification and is not a direct pin-compatible substitute.
Compliance Verification:
All recommended substitute parts maintain ROHS3 compliance and EAR99 export classification consistent with OPA277UAG4. Moisture sensitivity levels range from MSL 1 (unlimited) to MSL 3 (168 hours), requiring appropriate handling protocols during assembly.
Frequently Asked Questions (FAQ)
Q: Can OPA277UA directly replace OPA277UAG4 without circuit modification?
A: Yes. OPA277UA is the active production equivalent with identical electrical specifications, 8-SOIC packaging, and pinout. No circuit modification is required. The primary difference is product status transition from obsolete to active.
Q: What is the key difference between general purpose and instrumentation amplifier substitutes?
A: General purpose amplifiers (OPA277UA, LT1012IS8#TRPBF, OP177GSZ) are configured for single-ended output applications. Instrumentation amplifiers (LT1167 series, AD8221ARZ-RL) incorporate integrated gain-setting resistor networks and differential input stages, suitable for precision measurement and signal conditioning applications. Functional compatibility depends on circuit topology requirements.
Q: Why does NCS21911SN2T1G use a different package (5-TSOP) than the original OPA277UAG4 (8-SOIC)?
A: NCS21911SN2T1G is a zero-drift amplifier topology optimized for minimal input offset voltage (1 µV) and extended temperature range (-40°C to 125°C). The 5-TSOP package reflects onsemi's design approach for this device class. Pin-compatible 8-SOIC packaging is not available for this topology. PCB layout redesign is required for implementation.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance consistent with OPA277UAG4. Moisture sensitivity levels vary: OPA277UA, AD8221ARZ-RL, LT1012IS8#TRPBF, LT1167 series, and OP177GSZ are MSL 1 (unlimited); OPA277UAG4 is MSL 3 (168 hours). Verify MSL requirements for your assembly process.
Q: What supply voltage range must be maintained for substitution compatibility?
A: OPA277UAG4 operates across 4V to 36V supply span. Substitute parts must overlap this range: OPA277UA (4V to 36V), LT1167 series (4.6V to 36V), and AD8221ARZ-RL (4.6V to 36V) are fully compatible. LT1012IS8#TRPBF (2.4V to 40V) and OP177GSZ (6V to 36V) have different minimum requirements; verify your circuit design operates within the substitute part's specified range.
Q: Can LT1167IS8#TRPBF replace OPA277UAG4 in a general purpose amplifier circuit?
A: LT1167IS8#TRPBF is an instrumentation amplifier with integrated gain-setting resistor network. While electrical parameters (supply voltage, temperature range, package) are compatible, the internal architecture differs fundamentally from general purpose topology. Substitution is valid only if your circuit design accommodates instrumentation amplifier configuration. For true general purpose replacement, use OPA277UA.
Q: What inventory considerations apply to substitute part selection?
A: OPA277UA has 3960 pieces in stock (closest equivalent). LT1167CS8#TRPBF has highest inventory (300,300 pieces). LT1167IS8#TR has lowest inventory (699 pieces). Verify supplier inventory status for your procurement timeline and volume requirements.
Q: Does operating temperature range affect substitution decisions?
A: Yes. OPA277UAG4 operates -40°C to 85°C. LT1167CS8#PBF and LT1167CS8#TRPBF operate 0°C to 70°C, which does not cover the full original range. LT1167IS8#PBF, LT1167IS8#TR, and LT1167IS8#TRPBF operate -40°C to 85°C, matching the original specification. NCS21911SN2T1G extends to -40°C to 125°C. Verify your application's temperature requirements before final selection.
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