AMP04FS Equivalent & Substitute Parts

Part Overview

The AMP04FS is an instrumentation amplifier integrated circuit manufactured by Analog Devices Inc., housed in an 8-SOIC surface mount package. This device is classified as obsolete, with 2248 units available in new original stock. The AMP04FS operates across a supply voltage range of 5 V to 30 V and is designed for single-circuit instrumentation amplification applications with a -3dB bandwidth of 700 kHz. Due to its obsolete product status, identification of functionally equivalent active alternatives is necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Amplifier Type	Instrumentation
Number of Circuits	1
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
-3dB Bandwidth	700 kHz
Current - Input Bias	22 nA
Voltage - Input Offset	30 µV
Current - Supply	750 µA
Current - Output / Channel	30 mA
Voltage - Supply Span (Min)	5 V
Voltage - Supply Span (Max)	30 V
Operating Temperature	-40°C ~ 85°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AMP04FS is determined by compatibility across the following critical parameters: package type (8-SOIC surface mount), amplifier classification (instrumentation), circuit count (single circuit), and operating temperature range (-40°C to 85°C). All substitute parts identified maintain identical package geometry and mounting methodology, ensuring mechanical and electrical compatibility at the board level.

The substitute parts are grouped into two categories based on electrical performance alignment:

Direct Manufacturer Equivalent: AMP04FSZ represents a direct substitute from Analog Devices Inc., maintaining identical electrical specifications while offering active product status and improved packaging options.

Cross-Manufacturer Alternatives: Texas Instruments INA118 and INA126 series devices provide functional instrumentation amplifier solutions within the same package footprint. These alternatives exhibit variations in bandwidth, input bias current, input offset voltage, supply current, and output current specifications. Selection among these alternatives depends on application-specific performance requirements and supply voltage constraints.

Parameter Comparison

Parameter	AMP04FS	AMP04FSZ	INA118U	INA118U/2K5	INA118UB	INA118UB/2K5	INA126U	INA126U/2K5	INA126UA	INA126UA/2K5
Manufacturer	Analog Devices	Analog Devices	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
-3dB Bandwidth	700 kHz	700 kHz	800 kHz	800 kHz	800 kHz	800 kHz	200 kHz	200 kHz	200 kHz	200 kHz
Current - Input Bias	22 nA	22 nA	1 nA	1 nA	1 nA	1 nA	10 nA	10 nA	10 nA	10 nA
Voltage - Input Offset	30 µV	30 µV	25 µV	25 µV	10 µV	10 µV	100 µV	100 µV	150 µV	150 µV
Current - Supply	750 µA	750 µA	350 µA	350 µA	350 µA	350 µA	175 µA	175 µA	175 µA	175 µA
Current - Output / Channel	30 mA	30 mA	12 mA	12 mA	12 mA	12 mA	10 mA	10 mA	10 mA	10 mA
Voltage - Supply Span (Min)	5 V	5 V	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V
Voltage - Supply Span (Max)	30 V	30 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Moisture Sensitivity Level (MSL)	1	1	3	3	3	2	3	3	2	2
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AMP04FSZ is the primary substitute for the obsolete AMP04FS. This part maintains identical electrical specifications and operating parameters while offering active product status from Analog Devices Inc. The AMP04FSZ is ROHS3 compliant and available in tube packaging, providing direct functional replacement with improved supply chain availability.

INA118U, INA118U/2K5, INA118UB, and INA118UB/2K5 from Texas Instruments represent higher-performance alternatives with enhanced bandwidth (800 kHz versus 700 kHz), significantly lower input bias current (1 nA versus 22 nA), and reduced supply current consumption (350 µA versus 750 µA). These devices support extended supply voltage range (2.7 V to 36 V) and are ROHS3 compliant. The INA118UB variants offer superior input offset voltage specifications (10 µV versus 30 µV). These alternatives are suitable for applications where lower power consumption and improved input characteristics are beneficial.

INA126U, INA126U/2K5, INA126UA, and INA126UA/2K5 from Texas Instruments provide lower-bandwidth alternatives (200 kHz) with reduced supply current (175 µA) and lower output current capability (10 mA). These devices are appropriate for applications with relaxed bandwidth requirements and emphasis on power efficiency. The INA126UA variants offer MSL 2 rating compared to MSL 3 for standard INA126U devices.

All substitute parts maintain the 8-SOIC surface mount package geometry, ensuring mechanical compatibility with existing PCB layouts. Selection among alternatives depends on application-specific requirements for bandwidth, input bias current, supply voltage range, and power consumption constraints.

Frequently Asked Questions (FAQ)

Q: Can AMP04FSZ be used as a direct replacement for AMP04FS?

A: Yes. AMP04FSZ maintains identical electrical specifications, operating temperature range, and package configuration as AMP04FS. The primary difference is product status: AMP04FSZ is active while AMP04FS is obsolete. AMP04FSZ is the recommended direct substitute.

Q: What are the key differences between INA118 and INA126 series devices?

A: The INA118 series provides higher bandwidth (800 kHz) and lower input bias current (1 nA) compared to the INA126 series (200 kHz bandwidth, 10 nA input bias current). The INA118 series also offers higher output current capability (12 mA versus 10 mA). Selection depends on application bandwidth and current requirements.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. All substitute parts use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width. Pin-to-pin spacing and footprint dimensions are identical, allowing direct PCB layout compatibility without modification.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: MSL ratings indicate moisture sensitivity during storage and handling. AMP04FS has MSL 1 (unlimited shelf life), while most Texas Instruments alternatives have MSL 2 or MSL 3 (requiring controlled storage conditions). MSL 3 devices require storage at ≤30% relative humidity or in dry-pack conditions. MSL 2 devices allow 1-year shelf life under standard conditions.

Q: Do all substitute parts support the same supply voltage range?

A: No. AMP04FS and AMP04FSZ support 5 V to 30 V supply range. Texas Instruments alternatives (INA118 and INA126 series) support 2.7 V to 36 V, providing extended low-voltage capability. Applications requiring operation below 5 V must use Texas Instruments alternatives.

Q: Which substitute offers the lowest power consumption?

A: INA126 and INA126UA series devices consume 175 µA supply current, compared to 750 µA for AMP04FS. INA118 series devices consume 350 µA. For power-critical applications, INA126 variants are optimal.

Q: Are there compliance differences between substitute parts?

A: All active substitute parts are ROHS3 compliant and REACH unaffected. AMP04FS compliance status is not specified. All parts share identical ECCN (EAR99) and HTSUS (8542.33.0001) classifications.

Q: What packaging options are available for substitute parts?

A: AMP04FSZ is available in tube packaging. INA118U and INA126U variants are available in tube packaging. INA118U/2K5, INA118UB/2K5, INA126U/2K5, and INA126UA/2K5 variants are available in Cut Tape (CT) and Digi-Reel® packaging. Selection depends on procurement and assembly requirements.

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