OPA277PA Equivalent & Substitute Parts

Part Overview

The OPA277PA is a general-purpose operational amplifier manufactured by Texas Instruments, housed in an 8-PDIP through-hole package. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory of 5606 pieces. The OPA277PA serves applications requiring low-power, general-purpose amplification across industrial and consumer electronics. Alternative equivalent parts are necessary due to product discontinuation and to accommodate different packaging requirements, mounting technologies, and application-specific performance characteristics.

Substiute Parts

OPA277PA

Texas InstrumentsIn Stock: 5673OPA277PA Datasheet

Current PartRFQ

OPA277UA/2K5

Texas InstrumentsIn Stock: 26857OPA277UA/2K5 Datasheet

MFR RecommendedRFQ

LT1167CN8#PBF

Analog Devices Inc.In Stock: 1394LT1167CN8#PBF Datasheet

MFR RecommendedRFQ

LT1167IN8#PBF

Analog Devices Inc.In Stock: 774LT1167IN8#PBF Datasheet

MFR RecommendedRFQ

LT1360CN8#PBF

Analog Devices Inc.In Stock: 1163LT1360CN8#PBF Datasheet

MFR RecommendedRFQ

NCS21911SN2T1G

onsemiIn Stock: 3238NCS21911SN2T1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA277PA is determined by electrical parameter compatibility and mechanical packaging constraints. The primary substitution criteria are:

Electrical Compatibility Parameters:

• Slew Rate: 0.8 V/µs minimum
• Gain Bandwidth Product: 1 MHz minimum
• Voltage - Input Offset: 20 µV maximum
• Voltage - Supply Span: 4 V to 36 V operating range
• Operating Temperature: -40°C to 85°C minimum coverage
• Current - Output / Channel: 35 mA minimum

Mechanical Compatibility Parameters:

• Package Type: 8-DIP through-hole or surface-mount equivalent
• Mounting Technology: Through-hole or surface-mount alternatives

The substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents with Package Variation

• OPA277UA/2K5: Identical electrical specifications, surface-mount 8-SOIC package
• NCS21911SN2T1G: Enhanced performance (zero-drift topology), surface-mount 5-TSOP package

Category 2: Functional Alternatives with Different Amplifier Type

• LT1167CN8#PBF and LT1167IN8#PBF: Instrumentation amplifier topology, 8-DIP through-hole package
• LT1360CN8#PBF: Voltage feedback amplifier with higher bandwidth, 8-DIP through-hole package

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

OPA277UA/2K5 is the primary direct electrical equivalent. It maintains all electrical specifications of the OPA277PA with identical slew rate (0.8 V/µs), gain bandwidth product (1 MHz), input offset voltage (20 µV), and supply voltage range (4 V to 36 V). The difference is packaging: OPA277UA/2K5 uses surface-mount 8-SOIC technology instead of through-hole 8-DIP. This substitution requires PCB redesign for surface-mount assembly. Product status is Active with 26778 pieces in stock, ensuring long-term availability. Both parts are ROHS3 compliant.

For Enhanced Performance with Surface-Mount Packaging:

NCS21911SN2T1G offers superior electrical characteristics within a compact 5-TSOP surface-mount package. This zero-drift amplifier provides lower input offset voltage (1 µV versus 20 µV), higher slew rate (1.6 V/µs versus 0.8 V/µs), and extended operating temperature range (-40°C to 125°C). Supply voltage range remains compatible (4 V to 36 V). Current consumption is lower (475 µA versus 790 µA). Output current is reduced to 18 mA. This part is suitable for applications requiring improved precision and wider temperature operation. Product status is Active with 3200 pieces in stock.

For Through-Hole Package Retention with Instrumentation Amplifier Topology:

LT1167IN8#PBF maintains the 8-DIP through-hole package format and extends operating temperature to -40°C to 85°C. This instrumentation amplifier provides lower input bias current (80 pA versus 500 pA) and higher slew rate (1.2 V/µs). Supply voltage range is slightly higher minimum (4.6 V versus 4 V). This substitution is appropriate when instrumentation-grade input characteristics are beneficial. Product status is Active with 746 pieces in stock.

For Through-Hole Package with High-Bandwidth Requirements:

LT1360CN8#PBF retains the 8-DIP through-hole package but provides significantly higher gain bandwidth product (50 MHz versus 1 MHz) and slew rate (800 V/µs versus 0.8 V/µs). This voltage feedback amplifier is suitable for high-speed applications. Operating temperature range is 0°C to 70°C (narrower than OPA277PA). Supply voltage maximum is 30 V (versus 36 V). Product status is Active with 1147 pieces in stock.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting environmental compliance requirements equivalent to the OPA277PA.

Frequently Asked Questions (FAQ)

Q1: Can OPA277UA/2K5 be used as a direct replacement for OPA277PA in existing through-hole PCB designs?

A: OPA277UA/2K5 is electrically equivalent but requires PCB redesign. OPA277UA/2K5 uses 8-SOIC surface-mount packaging (0.154" width) instead of 8-DIP through-hole (0.300" width). Direct socket substitution is not possible. PCB layout modification and surface-mount assembly capability are required.

Q2: What is the primary advantage of NCS21911SN2T1G over OPA277PA?

A: NCS21911SN2T1G is a zero-drift amplifier with significantly lower input offset voltage (1 µV versus 20 µV), enabling higher precision applications. It also provides higher slew rate (1.6 V/µs), lower supply current (475 µA), and extended operating temperature to 125°C. The trade-off is reduced output current (18 mA versus 35 mA) and surface-mount 5-TSOP packaging requiring PCB redesign.

Q3: Why would LT1167IN8#PBF be selected over OPA277PA if both use 8-DIP packaging?

A: LT1167IN8#PBF is an instrumentation amplifier with lower input bias current (80 pA versus 500 pA), making it suitable for high-impedance signal sources. It maintains through-hole 8-DIP compatibility and extends operating temperature to -40°C to 85°C. Selection depends on application requirements for input impedance and bias current characteristics.

Q4: Is LT1360CN8#PBF suitable for low-frequency applications designed for OPA277PA?

A: LT1360CN8#PBF is not recommended for direct replacement in low-frequency applications. While it maintains 8-DIP through-hole packaging, its 50 MHz gain bandwidth product and 800 V/µs slew rate are designed for high-speed circuits. The higher supply current (4 mA versus 790 µA) and maximum supply voltage limit (30 V versus 36 V) also differ. Use only when high-bandwidth performance is required.

Q5: What packaging considerations apply when substituting OPA277PA?

A: OPA277PA uses through-hole 8-DIP packaging. Direct through-hole replacements are LT1167CN8#PBF, LT1167IN8#PBF, and LT1360CN8#PBF. Surface-mount alternatives are OPA277UA/2K5 (8-SOIC) and NCS21911SN2T1G (5-TSOP). Through-hole substitutes require no PCB redesign. Surface-mount substitutes require PCB layout modification and assembly process changes.

Q6: Are all substitute parts RoHS3 compliant?

A: Yes. OPA277PA, OPA277UA/2K5, NCS21911SN2T1G, LT1167CN8#PBF, LT1167IN8#PBF, and LT1360CN8#PBF are all ROHS3 compliant. All parts are REACH unaffected. Environmental compliance is equivalent across all options.

Q7: Which substitute part has the longest operating temperature range?

A: NCS21911SN2T1G provides the widest operating temperature range of -40°C to 125°C, compared to OPA277PA at -40°C to 85°C. This extended range is beneficial for industrial and automotive applications requiring operation at elevated temperatures.

Q8: What is the inventory status of substitute parts?

A: OPA277UA/2K5 has the highest inventory (26778 pieces), followed by NCS21911SN2T1G (3200 pieces), LT1360CN8#PBF (1147 pieces), LT1167CN8#PBF (1325 pieces), and LT1167IN8#PBF (746 pieces). OPA277PA is Last Time Buy with 5606 pieces remaining. Long-term availability is assured with active-status substitutes.