OPA177FP Equivalent & Substitute Parts

Part Overview

The OPA177FP is a general-purpose operational amplifier manufactured by Texas Instruments in 8-DIP through-hole packaging. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory of 2300 pieces. The OPA177FP serves applications requiring low-cost, general-purpose amplification with moderate bandwidth and low input offset voltage specifications.

Substitution becomes necessary due to the Last Time Buy status and potential long-term supply constraints. Alternative parts with equivalent or superior electrical characteristics and compatible packaging options are available from both Texas Instruments and Analog Devices Inc.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Slew Rate	0.3	V/µs
Gain Bandwidth Product	600	kHz
Current - Input Bias	500	pA
Voltage - Input Offset	10	µV
Current - Supply	1.3	mA
Voltage - Supply Span (Min)	6	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 eligibility for the OPA177FP is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: General Purpose
Number of Circuits: 1
Slew Rate: 0.3 V/µs (minimum acceptable)
Gain Bandwidth Product: 600 kHz (minimum acceptable)
Voltage Supply Range: 6 V to 36 V (must encompass or match)
Input Offset Voltage: 10 µV or lower
Input Bias Current: 500 pA or lower
Operating Temperature Range: Must include -40°C to 85°C or be compatible with application requirements
RoHS3 Compliance: Required for regulatory alignment

Packaging Considerations:

Through-hole 8-DIP package is the primary form factor
Surface-mount 8-SOIC alternative available for redesign scenarios

Substitute parts are grouped into two categories: direct pin-compatible through-hole replacements and alternative packaging options for design flexibility.

Parameter Comparison

Parameter	OPA177FP (Main)	OPA177GS/2K5	OP177FPZ	LT1001ACN8#PBF	LT1360CN8#PBF	OP07CN8#PBF	OP177GPZ
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	Voltage Feedback	General Purpose	General Purpose
Slew Rate (V/µs)	0.3	0.3	0.3	0.25	800	0.25	0.3
Gain Bandwidth Product (kHz)	600	600	600	800	50000	600	600
Input Bias Current	500 pA	500 pA	1.2 nA	500 pA	300 nA	1.8 nA	1.2 nA
Input Offset Voltage (µV)	10	20	10	10	300	60	20
Supply Current (mA)	1.3	1.3	1.6	—	4	—	1.6
Voltage Supply Min (V)	6	6	6	6	5	6	6
Voltage Supply Max (V)	36	36	36	36	30	36	36
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 85	0 to 125	0 to 70	0 to 70	-40 to 85
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package	8-DIP	8-SOIC	8-DIP	8-DIP	8-DIP	8-DIP	8-DIP
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Pin-Compatible Replacements (8-DIP Through-Hole):

OP177FPZ (Analog Devices Inc.) is the closest direct equivalent to OPA177FP. Both devices share identical slew rate (0.3 V/µs), gain bandwidth product (600 kHz), supply voltage range (6–36 V), and 8-DIP packaging. OP177FPZ maintains Active product status with 1469 units in stock. Input bias current is higher at 1.2 nA versus 500 pA, but input offset voltage remains at 10 µV. Supply current increases to 1.6 mA from 1.3 mA. This part is suitable for direct socket replacement in existing through-hole designs.

OP177GPZ (Analog Devices Inc.) provides identical electrical performance to OP177FPZ with 41541 units available, ensuring superior long-term supply availability. Operating temperature range matches OPA177FP (-40°C to 85°C). Input offset voltage is 20 µV, representing a minor degradation from the 10 µV specification. This part is recommended for new designs requiring extended supply security.

LT1001ACN8#PBF (Analog Devices Inc.) offers equivalent input offset voltage (10 µV) and input bias current (500 pA) with improved gain bandwidth product (800 kHz). Operating temperature range extends to 0–125°C, providing broader thermal coverage. Slew rate is slightly reduced to 0.25 V/µs. Supply voltage range remains 6–36 V. This part is suitable where enhanced bandwidth and extended temperature operation are beneficial.

OP07CN8#PBF (Analog Devices Inc.) maintains 600 kHz gain bandwidth product and 6–36 V supply range. Input offset voltage is 60 µV, representing significant degradation from the 10 µV baseline. Operating temperature is limited to 0–70°C. This part is not recommended as a primary substitute due to reduced performance specifications.

Alternative Packaging Option:

OPA177GS/2K5 (Texas Instruments) is the manufacturer-recommended substitute offering identical electrical specifications to OPA177FP (0.3 V/µs slew rate, 600 kHz bandwidth, 500 pA input bias current). This part is packaged in 8-SOIC surface-mount format with 10200 units in stock and Active product status. Selection of this part requires PCB redesign for surface-mount assembly. Input offset voltage is 20 µV. This option is suitable for new designs or redesigns where surface-mount technology is preferred.

Not Recommended:

LT1360CN8#PBF (Analog Devices Inc.) is a voltage feedback amplifier with fundamentally different architecture (50 MHz bandwidth, 800 V/µs slew rate, 300 nA input bias current). Operating temperature is limited to 0–70°C and supply voltage maximum is 30 V. This part is not electrically equivalent and is not suitable for OPA177FP substitution.

Frequently Asked Questions (FAQ)

Q1: Can OP177FPZ be used as a direct replacement for OPA177FP without circuit modification?

A: Yes. OP177FPZ is pin-compatible in 8-DIP through-hole packaging. Electrical parameters are equivalent within acceptable tolerances: slew rate 0.3 V/µs, gain bandwidth product 600 kHz, and supply voltage range 6–36 V. Input bias current increases from 500 pA to 1.2 nA and supply current increases from 1.3 mA to 1.6 mA. These differences are within typical circuit design margins for general-purpose amplifier applications.

Q2: What is the primary reason to substitute OPA177FP?

A: OPA177FP is designated Last Time Buy, indicating production discontinuation. Remaining inventory of 2300 units is finite. Substitution ensures long-term design support and supply continuity. Active-status alternatives such as OP177GPZ (41541 units) and OPA177GS/2K5 (10200 units) provide superior supply security.

Q3: Is OPA177GS/2K5 suitable for existing through-hole PCB designs?

A: No. OPA177GS/2K5 uses 8-SOIC surface-mount packaging, incompatible with through-hole PCB layouts. This part requires PCB redesign and surface-mount assembly capability. Selection is appropriate only for new designs or complete PCB redesigns.

Q4: How do input bias current differences affect circuit performance?

A: OPA177FP specifies 500 pA input bias current. OP177FPZ and OP177GPZ specify 1.2 nA. For most general-purpose applications with moderate impedance levels (under 1 MΩ), this difference produces negligible offset voltage contribution. High-impedance circuits (above 10 MΩ) may require input bias current compensation analysis. LT1001ACN8#PBF maintains 500 pA specification, matching OPA177FP exactly.

Q5: Can LT1360CN8#PBF replace OPA177FP?

A: No. LT1360CN8#PBF is a voltage feedback amplifier with fundamentally different specifications: 50 MHz gain bandwidth product (versus 600 kHz), 800 V/µs slew rate (versus 0.3 V/µs), and 300 nA input bias current (versus 500 pA). Operating temperature is limited to 0–70°C and maximum supply voltage is 30 V. This part is not electrically equivalent.

Q6: What compliance certifications apply to all substitute parts?

A: All substitute parts listed are ROHS3 compliant and REACH unaffected, matching OPA177FP regulatory status. All parts carry ECCN classification EAR99 and HTSUS code 8542.33.0001. Compliance documentation is consistent across all options.

Q7: Which substitute offers the best long-term supply availability?

A: OP177GPZ (Analog Devices Inc.) provides the highest inventory level at 41541 units with Active product status. This part is recommended for designs requiring maximum supply security and extended production life. Electrical performance is equivalent to OPA177FP with minor input offset voltage increase (20 µV versus 10 µV).

Q8: Are there performance differences between Texas Instruments and Analog Devices versions?

A: OPA177GS/2K5 (Texas Instruments) and OP177GPZ (Analog Devices) share identical electrical specifications. Both maintain 0.3 V/µs slew rate and 600 kHz bandwidth. Primary differences are packaging (8-SOIC versus 8-DIP) and inventory levels. Selection depends on assembly capability and supply requirements rather than performance.

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