OP400GS-REEL Equivalent & Substitute Parts

Part Overview

The OP400GS-REEL is a general purpose operational amplifier integrated circuit manufactured by Analog Devices Inc., configured as a 4-circuit differential amplifier in a 16-SOIC surface mount package. This device is classified as obsolete, indicating that direct procurement from primary sources is limited. The OP400GS-REEL operates across a supply voltage range of 6 V to 36 V with an operating temperature range of 0°C to 70°C, making it suitable for industrial and commercial applications requiring general purpose amplification.

Due to its obsolete status, identification of functionally equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications. Substitute parts must maintain electrical compatibility across critical parameters including supply voltage span, amplifier configuration, package type, and thermal operating range.

Key Parameters

Parameter	OP400GS-REEL Value
Amplifier Type	General Purpose
Number of Circuits	4
Output Type	Differential
Slew Rate	0.15 V/µs
Gain Bandwidth Product	500 kHz
Current - Input Bias	750 pA
Voltage - Input Offset	80 µV
Current - Supply	600 µA (x4 Channels)
Voltage - Supply Span (Min)	6 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	16-SOIC (0.295", 7.50mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the OP400GS-REEL are classified into two categories based on electrical and mechanical compatibility:

Direct Packaging Equivalent: The OP400GSZ-REEL maintains identical electrical specifications and package configuration (16-SOIC, 0.295" width) while offering active product status and improved compliance certifications (RoHS3, REACH Unaffected). This part represents a direct form-fit-function replacement.

Functional Equivalents with Parameter Variations: The LT1114 series (LT1114IS#TRPBF, LT1114IS#PBF, LT1114S#TRPBF, LT1114S#PBF) and LT1125MPSW#PBF provide 4-circuit general purpose amplification in surface mount packages. These parts differ in slew rate, gain bandwidth product, input bias current, supply current, and operating temperature range. The LT1114 series operates with a minimum supply voltage of 2 V (versus 6 V for OP400GS-REEL) and maximum of 40 V, with improved input bias current performance (70 pA versus 750 pA). The LT1125MPSW#PBF offers significantly higher slew rate (4.5 V/µs) and gain bandwidth product (12.5 MHz), with extended temperature range (-55°C to 125°C) but requires minimum supply voltage of 8 V.

Substitution Criteria: Electrical compatibility is determined by:

Number of circuits (4 required)
Amplifier type (General Purpose)
Supply voltage span overlap with application requirements
Operating temperature range coverage
Package compatibility with PCB layout constraints
Surface mount configuration

Parameter Comparison

Part Number	Manufacturer	Product Status	Number of Circuits	Slew Rate (V/µs)	Gain Bandwidth Product (kHz)	Input Bias Current (pA)	Input Offset Voltage (µV)	Supply Current (µA x4)	Supply Voltage Min (V)	Supply Voltage Max (V)	Operating Temperature (°C)	Package	Mounting Type
OP400GS-REEL	Analog Devices Inc.	Obsolete	4	0.15	500	750	80	600	6	36	0 ~ 70	16-SOIC (0.295")	Surface Mount
OP400GSZ-REEL	Analog Devices Inc.	Active	4	0.15	500	750	80	600	6	36	0 ~ 70	16-SOIC (0.295")	Surface Mount
LT1114IS#TRPBF	Analog Devices Inc.	Active	4	0.3	750	70	20	350	2	40	-40 ~ 85	16-SOIC (0.154")	Surface Mount
LT1114IS#PBF	Analog Devices Inc.	Active	4	0.3	750	70	20	350	2	40	-40 ~ 85	16-SOIC (0.154")	Surface Mount
LT1114S#TRPBF	Analog Devices Inc.	Active	4	0.3	750	70	20	350	2	40	0 ~ 70	16-SOIC (0.154")	Surface Mount
LT1114S#PBF	Analog Devices Inc.	Active	4	0.3	750	70	20	350	2	40	0 ~ 70	16-SOIC (0.154")	Surface Mount
LT1125MPSW#PBF	Analog Devices Inc.	Active	4	4.5	12500	8000	30	2300	8	44	-55 ~ 125	16-SOIC (0.295")	Surface Mount
AD8624ACPZ-RL	Analog Devices Inc.	Active	4	0.48	560	45	10	215	5	30	-40 ~ 125	16-WQFN CSP	Surface Mount

Engineering Selection Recommendations

Primary Recommendation: OP400GSZ-REEL

The OP400GSZ-REEL is the optimal substitute for the obsolete OP400GS-REEL. This part provides identical electrical specifications and package configuration, ensuring direct form-fit-function compatibility. The OP400GSZ-REEL maintains the same 16-SOIC (0.295" width) package, supply voltage range (6 V to 36 V), operating temperature span (0°C to 70°C), and all critical amplifier parameters. The primary advantage is active product status with RoHS3 compliance and REACH unaffected certification, providing long-term availability and regulatory compliance for new designs and production continuity.

Secondary Recommendation: LT1114S#TRPBF or LT1114S#PBF

The LT1114S series offers functional equivalence with active product status and RoHS3 compliance. These parts are suitable for applications where the OP400GSZ-REEL is unavailable. The LT1114S series provides improved input bias current (70 pA versus 750 pA) and input offset voltage (20 µV versus 80 µV), with higher slew rate (0.3 V/µs versus 0.15 V/µs) and gain bandwidth product (750 kHz versus 500 kHz). Operating temperature range matches the original part (0°C to 70°C). The primary limitation is package width (0.154" versus 0.295"), which requires PCB layout verification for pin-to-pin compatibility. Supply voltage range extends to 2 V minimum and 40 V maximum, providing broader application flexibility.

Alternative Recommendation: LT1125MPSW#PBF

The LT1125MPSW#PBF provides enhanced performance characteristics with 4-circuit general purpose amplification in the same 16-SOIC (0.295" width) package as the original part. This device offers significantly higher slew rate (4.5 V/µs) and gain bandwidth product (12.5 MHz), with extended operating temperature range (-55°C to 125°C) and RoHS3 compliance. Selection of this part is appropriate for applications requiring higher frequency response or extended temperature operation. The minimum supply voltage requirement of 8 V (versus 6 V) must be verified against application power supply specifications.

Compliance Considerations

All recommended substitute parts carry RoHS3 compliance and REACH unaffected certification, meeting current regulatory requirements for electronic component procurement. The OP400GS-REEL, as an obsolete part, does not carry these certifications. Migration to any active substitute part ensures compliance with environmental and hazardous substance directives.

Frequently Asked Questions (FAQ)

Q: Can the OP400GSZ-REEL be used as a direct replacement for the OP400GS-REEL?

A: Yes. The OP400GSZ-REEL is a direct form-fit-function replacement. Both parts share identical electrical specifications, package configuration (16-SOIC, 0.295" width), supply voltage range (6 V to 36 V), operating temperature (0°C to 70°C), and all critical amplifier parameters. The primary difference is product status: OP400GSZ-REEL is active with current manufacturing and RoHS3 compliance, while OP400GS-REEL is obsolete.

Q: What are the key differences between the OP400GS-REEL and LT1114S series?

A: The LT1114S series provides improved input bias current (70 pA versus 750 pA), lower input offset voltage (20 µV versus 80 µV), and higher slew rate (0.3 V/µs versus 0.15 V/µs). The LT1114S series operates with a lower minimum supply voltage (2 V versus 6 V) and higher maximum (40 V versus 36 V). The primary limitation is package width: LT1114S uses 0.154" width versus 0.295" for the OP400GS-REEL. PCB layout verification is required to confirm pin-to-pin compatibility before substitution.

Q: Is the LT1125MPSW#PBF suitable for all applications using the OP400GS-REEL?

A: The LT1125MPSW#PBF provides functional amplification with 4 circuits in the same 16-SOIC (0.295" width) package. However, this part has significantly different electrical characteristics: slew rate of 4.5 V/µs (versus 0.15 V/µs), gain bandwidth product of 12.5 MHz (versus 500 kHz), and minimum supply voltage of 8 V (versus 6 V). Substitution is appropriate only for applications where these enhanced specifications are compatible with circuit design requirements. Applications designed specifically for the OP400GS-REEL's lower bandwidth and slew rate characteristics may experience circuit instability with the LT1125MPSW#PBF.

Q: What is the significance of package width differences between 0.154" and 0.295"?

A: Package width affects PCB layout and pin spacing. The OP400GS-REEL uses 0.295" width (standard SOIC), while the LT1114 series uses 0.154" width (narrow SOIC). These are not interchangeable without PCB redesign. Pin-to-pin spacing differs, requiring verification of footprint compatibility. If PCB layout cannot accommodate the narrower package, the OP400GSZ-REEL or LT1125MPSW#PBF (both 0.295" width) are required.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts (OP400GSZ-REEL, LT1114 series, LT1125MPSW#PBF, and AD8624ACPZ-RL) carry RoHS3 compliance certification. The original OP400GS-REEL, as an obsolete part, does not carry this certification. Migration to any active substitute ensures compliance with current environmental directives.

Q: What is the difference between LT1114IS and LT1114S variants?

A: The LT1114IS variant operates across an extended temperature range (-40°C to 85°C), while the LT1114S variant operates across 0°C to 70°C, matching the original OP400GS-REEL temperature range. Both variants share identical electrical specifications. Selection between these variants depends on application temperature requirements. For applications operating within 0°C to 70°C, either variant is suitable; for extended temperature operation, the LT1114IS is required.

Q: Can the AD8624ACPZ-RL be used as a substitute?

A: The AD8624ACPZ-RL provides 4-circuit general purpose amplification with active product status and RoHS3 compliance. However, this part uses a different package type (16-WQFN CSP versus 16-SOIC), requiring PCB redesign. The AD8624ACPZ-RL offers superior performance characteristics (0.48 V/µs slew rate, 560 kHz gain bandwidth product, 45 pA input bias current) and extended operating temperature (-40°C to 125°C). Substitution is appropriate only when PCB layout can accommodate the different package footprint and when enhanced performance specifications are beneficial to circuit operation.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel® for high-volume production, Tape & Reel (TR) for automated assembly, and Tube for lower-volume applications. The OP400GSZ-REEL is available in Cut Tape & Digi-Reel® format. Selection of packaging format depends on production volume and assembly equipment compatibility. All packaging formats provide identical electrical performance.

Q: How do I verify supply voltage compatibility for substitution?

A: Compare the application's power supply voltage against the substitute part's supply voltage range. The OP400GS-REEL requires 6 V to 36 V. The OP400GSZ-REEL maintains this range. The LT1114 series operates from 2 V to 40 V, providing broader compatibility. The LT1125MPSW#PBF requires 8 V to 44 V minimum. If the application operates below 8 V, the LT1125MPSW#PBF is not suitable. Verify that the substitute part's supply voltage range encompasses the application's operating voltage before substitution.

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