OP400GS Equivalent & Substitute Parts

Part Overview

The OP400GS 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 the original manufacturer is no longer available through standard channels. The OP400GS operates across a supply voltage range of 6V to 36V 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, equivalent and substitute parts must be identified to maintain design continuity and ensure component availability for production, repair, and redesign efforts. Substitute components are selected based on matching electrical characteristics, package compatibility, and functional equivalence within the linear amplifier category.

Key Parameters

Parameter	OP400GS Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	Circuits
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 Range	0 to 70	°C
Package / Case	16-SOIC (0.295", 7.50mm Width)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts for the OP400GS are categorized based on electrical and mechanical compatibility within the linear amplifier domain. The primary substitution criteria are:

Direct Electrical Equivalence: Parts must maintain the same number of circuits (4), amplifier type (general purpose), and compatible output configuration. The slew rate, gain bandwidth product, input bias current, input offset voltage, and supply current define the operational performance envelope.

Supply Voltage Compatibility: The substitute must operate within or encompass the original 6V to 36V supply range. Parts with extended supply ranges (such as 2V to 40V) provide broader application flexibility while maintaining backward compatibility.

Package and Mounting Compatibility: Surface mount packages in 16-pin configurations (16-SOIC or equivalent footprints) ensure mechanical and electrical compatibility with existing printed circuit board designs.

Temperature Range Considerations: The original OP400GS operates from 0°C to 70°C. Substitutes with extended temperature ranges (such as -40°C to 125°C) provide enhanced operational flexibility without compromising the original specification.

Product Status and Compliance: Active product status ensures ongoing availability and support. RoHS3 compliance and REACH unaffected status confirm environmental and regulatory alignment with modern manufacturing standards.

Parameter Comparison

Parameter	OP400GS	OP400GSZ	AD8624ACPZ-RL	LT1114IS#TRPBF	LT1114S#TRPBF	LT1125MPSW#PBF	TS514AIDT
Manufacturer	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	STMicroelectronics
Number of Circuits	4	4	4	4	4	4	4
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Slew Rate (V/µs)	0.15	0.15	0.48	0.3	0.3	4.5	1.5
Gain Bandwidth Product (kHz)	500	500	560	750	750	12500	3000
Current - Input Bias (pA)	750	750	45	70	70	8000	50000
Voltage - Input Offset (µV)	80	80	10	20	20	30	500
Current - Supply (µA)	600	600	215	350	350	2300	500
Voltage - Supply Span Min (V)	6	6	5	2	2	8	6
Voltage - Supply Span Max (V)	36	36	30	40	40	44	30
Operating Temperature (°C)	0 to 70	0 to 70	-40 to 125	-40 to 85	0 to 70	-55 to 125	-40 to 125
Package / Case	16-SOIC (7.50mm)	16-SOIC (7.50mm)	16-WQFN CSP (4x4)	16-SOIC (3.90mm)	16-SOIC (3.90mm)	16-SOIC (7.50mm)	14-SOIC (3.90mm)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

OP400GSZ is the direct equivalent substitute for the OP400GS. This part maintains identical electrical specifications, package dimensions (16-SOIC, 7.50mm width), and functional characteristics. The OP400GSZ is manufactured by Analog Devices Inc. and carries active product status with ROHS3 compliance and REACH unaffected certification. The primary distinction is packaging format (tube versus unspecified for the original), which does not affect electrical performance. This substitute is recommended as the primary replacement for direct design continuity.

LT1114IS#TRPBF and LT1114S#TRPBF are compatible substitutes offering improved performance characteristics. These parts maintain the 4-circuit general-purpose amplifier configuration with enhanced gain bandwidth product (750 kHz versus 500 kHz) and lower input offset voltage (20 µV versus 80 µV). The supply voltage range extends to 40V maximum, providing broader operational flexibility. Both parts are active products with ROHS3 compliance. The LT1114 series operates at lower supply currents (350 µA versus 600 µA), reducing power consumption. Package dimensions differ slightly (16-SOIC, 3.90mm width), requiring verification of printed circuit board footprint compatibility.

LT1125MPSW#PBF represents a higher-performance alternative with significantly enhanced slew rate (4.5 V/µs versus 0.15 V/µs) and gain bandwidth product (12.5 MHz versus 500 kHz). This part is suitable for applications requiring faster signal processing and wider bandwidth. The supply voltage range extends to 44V maximum. Operating temperature range extends to -55°C to 125°C, supporting extended environmental conditions. Package dimensions match the original (16-SOIC, 7.50mm width). Supply current is elevated (2.3 mA versus 600 µA), which must be considered in power budget calculations. This substitute is active with ROHS3 compliance.

AD8624ACPZ-RL offers rail-to-rail output capability with improved input bias current (45 pA versus 750 pA) and input offset voltage (10 µV versus 80 µV). The gain bandwidth product is 560 kHz, closely matching the original specification. Operating temperature range extends to -40°C to 125°C. The package format differs significantly (16-WQFN CSP, 4x4 footprint), requiring substantial printed circuit board redesign. This substitute is recommended only when rail-to-rail output performance is required and board redesign is feasible.

TS514AIDT is a cross-manufacturer substitute from STMicroelectronics. This part maintains the 4-circuit general-purpose amplifier configuration with active product status and ROHS3 compliance. The package format is 14-SOIC (3.90mm width), which differs from the original 16-pin configuration, requiring careful footprint evaluation. The gain bandwidth product (3 MHz) and slew rate (1.5 V/µs) exceed the original specifications. Input offset voltage (500 µV) is significantly higher than the original (80 µV), which may impact precision applications. This substitute is suitable for applications where higher performance and cross-manufacturer sourcing are acceptable.

Frequently Asked Questions (FAQ)

Q: Can OP400GSZ be used as a direct replacement for OP400GS without circuit modifications?

A: Yes. The OP400GSZ maintains identical electrical specifications, package dimensions, and pin configuration as the OP400GS. No circuit modifications are required. The primary difference is packaging format (tube), which does not affect electrical performance or board assembly compatibility.

Q: What are the key differences between OP400GSZ and LT1114IS#TRPBF?

A: Both parts are 4-circuit general-purpose amplifiers with compatible supply voltage ranges. The LT1114IS#TRPBF offers improved performance with higher gain bandwidth product (750 kHz versus 500 kHz), lower input offset voltage (20 µV versus 80 µV), and reduced supply current (350 µA versus 600 µA). The package width differs (3.90mm versus 7.50mm), requiring footprint verification. The LT1114 series operates at lower supply currents, reducing power consumption in battery-powered applications.

Q: Is the LT1125MPSW#PBF suitable for high-speed applications?

A: The LT1125MPSW#PBF is suitable for applications requiring higher slew rates and bandwidth. The slew rate of 4.5 V/µs and gain bandwidth product of 12.5 MHz significantly exceed the original OP400GS specifications (0.15 V/µs and 500 kHz). However, supply current is elevated (2.3 mA versus 600 µA), which must be considered in power budget calculations. The package dimensions match the original, simplifying board integration.

Q: Can AD8624ACPZ-RL be used in place of OP400GS without board redesign?

A: No. The AD8624ACPZ-RL uses a 16-WQFN CSP (4x4) package format, which differs significantly from the original 16-SOIC (7.50mm) package. Substantial printed circuit board redesign is required to accommodate the different footprint, pin spacing, and thermal characteristics. This substitute is recommended only when rail-to-rail output performance justifies the redesign effort.

Q: What is the primary advantage of TS514AIDT as a substitute?

A: The TS514AIDT provides cross-manufacturer sourcing from STMicroelectronics, potentially improving supply chain flexibility and availability. The part offers higher gain bandwidth product (3 MHz) and slew rate (1.5 V/µs) compared to the original. However, the 14-pin package differs from the original 16-pin configuration, and input offset voltage is significantly higher (500 µV versus 80 µV), which may impact precision applications.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed (OP400GSZ, AD8624ACPZ-RL, LT1114IS#TRPBF, LT1114S#TRPBF, LT1125MPSW#PBF, and TS514AIDT) are ROHS3 compliant and REACH unaffected. The original OP400GS, being obsolete, does not carry explicit compliance certifications in the provided specifications.

Q: Which substitute offers the lowest power consumption?

A: The AD8624ACPZ-RL offers the lowest supply current at 215 µA (x4 channels), compared to the original OP400GS at 600 µA. The LT1114 series provides moderate power reduction at 350 µA. The LT1125MPSW#PBF has elevated supply current (2.3 mA) due to higher performance specifications. Selection depends on balancing power consumption requirements with performance needs.

Q: What temperature range considerations apply when selecting a substitute?

A: The original OP400GS operates from 0°C to 70°C. Substitutes with extended temperature ranges (such as -40°C to 125°C for LT1114IS#TRPBF and AD8624ACPZ-RL) provide enhanced operational flexibility for industrial and automotive applications. The LT1125MPSW#PBF extends to -55°C to 125°C, supporting extreme environmental conditions. Selection depends on the target application's temperature requirements.

Q: Can multiple substitute parts be used interchangeably in the same design?

A: No. While all listed parts are 4-circuit general-purpose amplifiers, they have different electrical characteristics, package formats, and performance specifications. Each substitute must be evaluated individually for the specific application requirements. Mixing different substitute parts in the same design may result in performance inconsistencies and is not recommended without thorough circuit analysis and testing.

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