INA118UG4 Equivalent & Substitute Parts

Part Overview

The INA118UG4 is an instrumentation amplifier manufactured by Texas Instruments, featuring a single circuit in 8-SOIC surface mount packaging. This device is classified as discontinued at DiGi Electronics, which necessitates identification of equivalent and substitute components for ongoing design support and procurement.

The INA118UG4 operates across a wide supply voltage range of 2.7 V to 36 V with low input bias current of 1 nA and input offset voltage of 25 µV. The device delivers 12 mA output current per channel with a slew rate of 0.9 V/µs and -3dB bandwidth of 800 kHz. All substitute parts maintain the same 8-SOIC package footprint and surface mount mounting type, ensuring mechanical compatibility.

Key Parameters

Parameter	INA118UG4	Unit
Amplifier Type	Instrumentation	—
Number of Circuits	1	—
Slew Rate	0.9	V/µs
-3dB Bandwidth	800	kHz
Current - Input Bias	1	nA
Voltage - Input Offset	25	µV
Current - Supply	350	µA
Current - Output / Channel	12	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	3 (168 Hours)	—

Substitute Part Grouping Explanation

Substitution of the INA118UG4 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: Instrumentation
Number of Circuits: 1
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C to 85°C
Supply Voltage Range: Minimum 2.7 V, Maximum 36 V

Secondary Compatibility Parameters:

Slew Rate: 0.9 V/µs or greater
-3dB Bandwidth: 800 kHz or greater
Current - Input Bias: 1 nA or lower
Voltage - Input Offset: 25 µV or lower
Current - Supply: 350 µA or lower
Current - Output / Channel: 12 mA or greater

Substitute parts are grouped into two categories based on Texas Instruments INA118 series variants and Analog Devices AD620/AD621 series alternatives. All substitute parts maintain identical package geometry and surface mount compatibility. Parts meeting all primary criteria and equal or superior secondary parameters are classified as direct substitutes.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	Bandwidth (kHz)	Input Bias (nA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Product Status
INA118UG4	Texas Instruments	0.9	800	1	25	350	12	2.7	36	Discontinued
INA118U	Texas Instruments	0.9	800	1	25	350	12	2.7	36	Active
INA118UB	Texas Instruments	0.9	800	1	10	350	12	2.7	36	Active
AD620ARZ	Analog Devices Inc.	1.2	1000	0.5	30	900	18	4.6	36	Active
AD620ARZ-REEL	Analog Devices Inc.	1.2	1000	0.5	30	900	18	4.6	36	Active
AD620ARZ-REEL7	Analog Devices Inc.	1.2	1000	0.5	30	900	18	4.6	36	Active
AD620BRZ	Analog Devices Inc.	1.2	1000	0.5	15	900	18	4.6	36	Active
AD620BRZ-R7	Analog Devices Inc.	1.2	1000	0.5	15	900	18	4.6	36	Active
AD620BRZ-RL	Analog Devices Inc.	1.2	1000	0.5	15	900	18	4.6	36	Active
AD621ARZ	Analog Devices Inc.	1.2	800	0.5	75	900	18	4.6	36	Active
AD621ARZ-R7	Analog Devices Inc.	1.2	800	0.5	75	900	18	4.6	36	Active

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Identical Electrical Performance):

INA118U and INA118UB are direct substitutes manufactured by Texas Instruments. Both maintain the same 8-SOIC package, surface mount configuration, and operating temperature range as the INA118UG4. INA118U provides identical electrical specifications. INA118UB offers improved input offset voltage of 10 µV compared to the original 25 µV specification. Both parts are currently in active product status with robust inventory availability, making them the preferred replacement options.

Tier 2 - Compatible Substitutes (Enhanced Performance):

AD620 series parts (AD620ARZ, AD620ARZ-REEL, AD620ARZ-REEL7, AD620BRZ, AD620BRZ-R7, AD620BRZ-RL) manufactured by Analog Devices Inc. are compatible substitutes with enhanced electrical performance. These devices deliver higher slew rate (1.2 V/µs versus 0.9 V/µs), increased bandwidth (1 MHz versus 800 kHz), lower input bias current (0.5 nA versus 1 nA), and higher output current capability (18 mA versus 12 mA). The AD620BRZ variants offer superior input offset voltage of 15 µV. All AD620 parts require minimum supply voltage of 4.6 V, which differs from the INA118UG4 minimum of 2.7 V. These parts are suitable for applications where the higher minimum supply voltage is acceptable and enhanced performance is beneficial.

Tier 3 - Conditional Substitutes (Bandwidth Consideration):

AD621ARZ and AD621ARZ-R7 maintain 800 kHz bandwidth matching the original specification but feature higher input offset voltage of 75 µV. These parts are suitable only for applications where input offset voltage tolerance is not critical and the 800 kHz bandwidth requirement is essential.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original INA118UG4. Moisture sensitivity levels vary: INA118 series parts retain MSL 3 (168 Hours), while AD620 and AD621 series parts feature MSL 1 (Unlimited), providing superior moisture handling characteristics.

Frequently Asked Questions (FAQ)

Q: Can INA118U directly replace INA118UG4 in existing designs?

A: Yes. INA118U provides identical electrical specifications and package configuration. The primary difference is product status: INA118U is active while INA118UG4 is discontinued. Both operate across 2.7 V to 36 V supply range with identical slew rate, bandwidth, input bias current, and output current specifications.

Q: What is the key difference between INA118U and INA118UB?

A: Both parts are electrically and mechanically identical except for input offset voltage. INA118U specifies 25 µV input offset voltage, while INA118UB specifies 10 µV. INA118UB provides superior precision for applications requiring lower input offset voltage. Both are active products with adequate inventory.

Q: Can AD620 series parts replace INA118UG4?

A: AD620 series parts are compatible substitutes with enhanced performance characteristics. They deliver higher slew rate (1.2 V/µs), increased bandwidth (1 MHz), lower input bias current (0.5 nA), and higher output current (18 mA). However, AD620 parts require minimum supply voltage of 4.6 V, compared to INA118UG4 minimum of 2.7 V. Designs operating at supply voltages below 4.6 V cannot use AD620 substitutes. For applications with adequate supply voltage headroom, AD620 parts offer superior performance.

Q: What is the difference between AD620ARZ and AD620BRZ?

A: Both parts share identical electrical performance except for input offset voltage. AD620ARZ specifies 30 µV input offset voltage, while AD620BRZ specifies 15 µV. AD620BRZ is the precision grade variant. Packaging variants (REEL, REEL7, RL) indicate different tape and reel configurations for automated assembly but do not affect electrical performance.

Q: Are AD621ARZ parts suitable substitutes?

A: AD621ARZ parts maintain 800 kHz bandwidth matching the original INA118UG4 but feature significantly higher input offset voltage of 75 µV. These parts are suitable only for applications where input offset voltage tolerance is not critical. For precision measurement applications, AD620BRZ variants are preferred.

Q: What packaging options are available for substitute parts?

A: All substitute parts maintain the 8-SOIC (0.154", 3.90mm Width) surface mount package. Packaging variants differ in tape and reel configurations: Tube packaging for individual component handling, Cut Tape (CT) & Digi-Reel® for automated assembly. These variants do not affect electrical performance or mechanical compatibility.

Q: Do substitute parts maintain RoHS and REACH compliance?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the original INA118UG4. Moisture sensitivity levels vary: INA118 series parts retain MSL 3 (168 Hours), while AD620 and AD621 series parts feature MSL 1 (Unlimited).

Q: Which substitute part offers the best overall performance?

A: AD620BRZ and AD620BRZ-R7 offer the highest performance specification with 1.2 V/µs slew rate, 1 MHz bandwidth, 0.5 nA input bias current, and 15 µV input offset voltage. These parts are suitable for applications where supply voltage is 4.6 V or higher and enhanced performance is required.

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