OPA277PAG4 Equivalent & Substitute Parts

Part Overview

The OPA277PAG4 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 availability. The OPA277PAG4 delivers 1 MHz gain-bandwidth product with low input offset voltage (20 µV) and minimal input bias current (500 pA), making it suitable for precision analog signal conditioning applications across industrial and instrumentation systems.

Finding equivalent and substitute parts is necessary due to the Last Time Buy status, which restricts long-term procurement. Alternative components with compatible electrical and mechanical specifications ensure design continuity and supply chain resilience.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
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
Current - Output / Channel	35	mA
Voltage - Supply Span (Min)	4	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-40 to 85	°C
Mounting Type	Through Hole	—
Package / Case	8-DIP (0.300", 7.62mm)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the OPA277PAG4 is based on strict electrical and mechanical parameter compatibility. The following criteria determine valid substitutes:

Primary Substitution Criteria:

Slew Rate: 0.8 V/µs (exact match required)
Gain Bandwidth Product: 1 MHz (exact match required)
Current - Input Bias: 500 pA (exact match required)
Voltage - Input Offset: 20 µV (exact match required)
Current - Supply: 790 µA (exact match required)
Current - Output / Channel: 35 mA (exact match required)
Voltage - Supply Span: 4 V to 36 V (exact match required)
Operating Temperature: -40°C to 85°C (exact match required)
Package / Case: 8-DIP (0.300", 7.62mm) (exact match required)

Substitute Categories:

Category 1: Direct Package Equivalent (Through-Hole 8-DIP) OPA277PA (Burr Brown) maintains identical electrical specifications and through-hole 8-DIP packaging. This substitute is functionally equivalent with Active product status.

Category 2: Surface Mount Alternative (8-SOIC) OPA277UA/2K5 (Texas Instruments) provides identical electrical performance with surface-mount 8-SOIC packaging. This option accommodates modern PCB assembly requirements while maintaining full electrical compatibility.

Category 3: Alternative Amplifier Types (8-DIP Package) LT1167ACN8#PBF, LT1167CN8#PBF, and LT1167IN8#PBF (Analog Devices Inc.) are instrumentation amplifiers in 8-DIP packaging. These parts differ in amplifier type classification and operating temperature ranges but share the same physical package footprint.

LT1360CN8#PBF (Analog Devices Inc.) is a voltage feedback amplifier in 8-DIP packaging with significantly different electrical characteristics (800 V/µs slew rate, 50 MHz gain-bandwidth product).

Category 4: Surface Mount Zero-Drift Alternative (5-TSOP) NCS21911SN2T1G (onsemi) is a zero-drift amplifier in 5-TSOP surface-mount package with superior input offset voltage (1 µV) and extended operating temperature range (-40°C to 125°C).

Parameter Comparison

Parameter	OPA277PAG4	OPA277PA	OPA277UA/2K5	LT1167ACN8#PBF	LT1167CN8#PBF	LT1167IN8#PBF	LT1360CN8#PBF	NCS21911SN2T1G
Manufacturer	Texas Instruments	Burr Brown	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	onsemi
Amplifier Type	General Purpose	General Purpose	General Purpose	Instrumentation	Instrumentation	Instrumentation	Voltage Feedback	Zero-Drift
Number of Circuits	1	1	1	1	1	1	1	1
Slew Rate (V/µs)	0.8	0.8	0.8	1.2	1.2	1.2	800	1.6
Gain Bandwidth Product (MHz)	1	1	1	1	1	1	50	2
Current - Input Bias (pA)	500	500	500	50	80	80	300000	100
Voltage - Input Offset (µV)	20	20	20	15	20	20	300	1
Current - Supply (µA)	790	790	790	900	900	900	4000	475
Current - Output / Channel (mA)	35	35	35	—	—	27	34	18
Voltage - Supply Span Min (V)	4	4	4	4.6	4.6	4.6	5	4
Voltage - Supply Span Max (V)	36	36	36	36	36	36	30	36
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 85	0 to 70	0 to 70	-40 to 85	0 to 70	-40 to 125
Mounting Type	Through Hole	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole	Through Hole	Surface Mount
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-SOIC (0.154", 3.90mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	SOT-23-5 Thin, TSOT-23-5
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

OPA277PA (Burr Brown) is the primary direct substitute for OPA277PAG4. Both devices maintain identical electrical specifications and through-hole 8-DIP packaging. OPA277PA carries Active product status with 5606 units in stock, providing superior long-term availability compared to the Last Time Buy OPA277PAG4.

OPA277UA/2K5 (Texas Instruments) is functionally equivalent with identical electrical performance but uses surface-mount 8-SOIC packaging. This option is suitable for designs transitioning to surface-mount assembly. With 26778 units in stock, this part offers the highest inventory availability. Selection requires PCB redesign to accommodate the different package footprint.

For Extended Temperature Range Applications:

LT1167IN8#PBF (Analog Devices Inc.) maintains the -40°C to 85°C operating temperature range matching OPA277PAG4. This instrumentation amplifier variant provides improved input bias current (80 pA) and operates in the same 8-DIP package. Product status is Active with 746 units in stock.

For Superior Precision Requirements:

NCS21911SN2T1G (onsemi) offers exceptional input offset voltage performance (1 µV versus 20 µV) and extended operating temperature range (-40°C to 125°C). This zero-drift amplifier uses surface-mount 5-TSOP packaging with 3200 units in stock. Selection requires PCB redesign and is appropriate for applications demanding ultra-low offset voltage specifications.

Not Recommended for Direct Substitution:

LT1360CN8#PBF exhibits significantly different electrical characteristics (800 V/µs slew rate, 50 MHz gain-bandwidth product, 300 nA input bias current) and reduced supply voltage range (5 V to 30 V maximum). This voltage feedback amplifier is unsuitable as a general substitute.

LT1167ACN8#PBF and LT1167CN8#PBF operate within 0°C to 70°C temperature range, which does not meet the -40°C to 85°C requirement of OPA277PAG4.

All recommended substitutes maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory compatibility.

Frequently Asked Questions (FAQ)

Q: Can OPA277PA directly replace OPA277PAG4 without PCB modifications?

A: Yes. OPA277PA is a direct substitute with identical electrical specifications and 8-DIP through-hole packaging. No PCB layout changes are required. Both devices use the same pin configuration and mechanical footprint.

Q: What is the primary reason to substitute OPA277PAG4?

A: OPA277PAG4 carries Last Time Buy status, indicating production discontinuation. Substitution ensures long-term supply chain continuity. OPA277PA and OPA277UA/2K5 both maintain Active product status with significantly higher inventory levels.

Q: Can OPA277UA/2K5 replace OPA277PAG4 in existing designs?

A: OPA277UA/2K5 provides identical electrical performance but uses 8-SOIC surface-mount packaging instead of 8-DIP through-hole. PCB redesign is required. This option is suitable for new designs or boards undergoing revision.

Q: Are instrumentation amplifiers (LT1167 series) suitable substitutes?

A: LT1167 devices differ in amplifier type classification and operating temperature ranges. LT1167IN8#PBF maintains the -40°C to 85°C temperature range and 8-DIP package, making it compatible for applications where instrumentation amplifier characteristics are acceptable. LT1167ACN8#PBF and LT1167CN8#PBF operate only to 70°C and are not suitable for full temperature range applications.

Q: What are the key electrical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: slew rate (0.8 V/µs), gain-bandwidth product (1 MHz), input bias current (500 pA), input offset voltage (20 µV), supply current (790 µA), output current (35 mA), and supply voltage range (4 V to 36 V). Deviations in these parameters indicate different device characteristics and potential circuit performance changes.

Q: Is NCS21911SN2T1G a suitable substitute for general-purpose applications?

A: NCS21911SN2T1G is suitable for applications requiring superior input offset voltage performance (1 µV) and extended temperature range (-40°C to 125°C). However, this zero-drift amplifier uses 5-TSOP surface-mount packaging, requiring PCB redesign. Selection is appropriate for precision measurement and instrumentation applications where offset voltage specifications are critical.

Q: Do all substitute parts maintain RoHS3 compliance?

A: Yes. All recommended substitute parts are ROHS3 Compliant and REACH Unaffected, ensuring regulatory compatibility with OPA277PAG4.

Q: What inventory considerations should guide substitution decisions?

A: OPA277UA/2K5 offers the highest inventory availability (26778 units), followed by OPA277PA (5606 units) and NCS21911SN2T1G (3200 units). OPA277PAG4 has 1159 units with Last Time Buy status. For long-term procurement, OPA277PA or OPA277UA/2K5 are preferred due to Active product status and superior stock levels.

Q: Can LT1360CN8#PBF replace OPA277PAG4?

A: No. LT1360CN8#PBF is a voltage feedback amplifier with fundamentally different electrical characteristics: 800 V/µs slew rate (versus 0.8 V/µs), 50 MHz gain-bandwidth product (versus 1 MHz), and 300 nA input bias current (versus 500 pA). These differences result in incompatible circuit behavior and performance. This device is not suitable as a substitute.

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