INA118UBG4 Equivalent & Substitute Parts

Part Overview

The INA118UBG4 is a single-channel instrumentation amplifier manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is discontinued at DiGi Electronics but remains available in inventory. The INA118UBG4 operates across a wide supply voltage range of 2.7 V to 36 V and is designed for precision signal conditioning applications requiring low input bias current and minimal input offset voltage. Due to its discontinued status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	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	10	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 INA118UBG4 is determined by the following critical 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 to Maximum 36 V

Secondary Compatibility Parameters:

Slew Rate: 0.9 V/µs or higher
-3dB Bandwidth: 800 kHz or higher
Current - Input Bias: 1 nA or lower
Voltage - Input Offset: 10 µV or lower
Current - Supply: 350 µA or lower
Current - Output / Channel: 12 mA or higher

Substitute parts are grouped into two categories based on electrical performance alignment with the INA118UBG4 specifications.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	-3dB Bandwidth (kHz)	Input Bias (nA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Package	Product Status
INA118UBG4	Texas Instruments	0.9	800	1	10	350	12	2.7	36	8-SOIC	Discontinued
INA118UB	Texas Instruments	0.9	800	1	10	350	12	2.7	36	8-SOIC	Active
AD620ARZ	Analog Devices Inc.	1.2	1000	0.5	30	900	18	4.6	36	8-SOIC	Active
AD620ARZ-REEL	Analog Devices Inc.	1.2	1000	0.5	30	900	18	4.6	36	8-SOIC	Active
AD620ARZ-REEL7	Analog Devices Inc.	1.2	1000	0.5	30	900	18	4.6	36	8-SOIC	Active
AD620BRZ	Analog Devices Inc.	1.2	1000	0.5	15	900	18	4.6	36	8-SOIC	Active
AD620BRZ-R7	Analog Devices Inc.	1.2	1000	0.5	15	900	18	4.6	36	8-SOIC	Active
AD620BRZ-RL	Analog Devices Inc.	1.2	1000	0.5	15	900	18	4.6	36	8-SOIC	Active
AD621ARZ	Analog Devices Inc.	1.2	800	0.5	75	900	18	4.6	36	8-SOIC	Active
AD621ARZ-R7	Analog Devices Inc.	1.2	800	0.5	75	900	18	4.6	36	8-SOIC	Active
AD621ARZ-RL	Analog Devices Inc.	1.2	800	0.5	75	900	18	4.6	36	8-SOIC	Active

Engineering Selection Recommendations

Tier 1 - Direct Equivalent (Recommended for Immediate Replacement):

INA118UB is the active product line equivalent from Texas Instruments. This part maintains identical electrical specifications to the INA118UBG4 across all critical parameters: 0.9 V/µs slew rate, 800 kHz bandwidth, 1 nA input bias current, 10 µV input offset voltage, and 2.7 V to 36 V supply range. The INA118UB is currently in active production status with 4,953 pieces in stock. This part is ROHS3 compliant and carries the same REACH unaffected status as the original part.

Tier 2 - Functional Substitutes (AD620 Series):

The AD620ARZ, AD620ARZ-REEL, AD620ARZ-REEL7, AD620BRZ, AD620BRZ-R7, and AD620BRZ-RL from Analog Devices Inc. are functional substitutes with enhanced performance characteristics. These parts feature higher slew rate (1.2 V/µs versus 0.9 V/µs), increased bandwidth (1000 kHz versus 800 kHz), and lower input bias current (0.5 nA versus 1 nA). The AD620BRZ variants offer superior input offset voltage of 15 µV compared to the INA118UBG4 specification of 10 µV. All AD620 variants maintain the 8-SOIC package format and -40°C to 85°C operating temperature range. Minimum supply voltage is 4.6 V, which is higher than the INA118UBG4 minimum of 2.7 V. All AD620 variants are active products with substantial inventory availability and ROHS3 compliance.

Tier 3 - Bandwidth-Matched Substitutes (AD621 Series):

The AD621ARZ, AD621ARZ-R7, and AD621ARZ-RL from Analog Devices Inc. maintain the 800 kHz bandwidth specification matching the INA118UBG4. These parts feature 1.2 V/µs slew rate and 0.5 nA input bias current. Input offset voltage is specified at 75 µV, which exceeds the INA118UBG4 specification of 10 µV. Minimum supply voltage is 4.6 V. All AD621 variants are active products with ROHS3 compliance and MSL rating of 1 (Unlimited).

All substitute parts listed are ROHS3 compliant, REACH unaffected, and carry ECCN classification EAR99. Selection should be based on specific application requirements regarding supply voltage range, input offset voltage tolerance, and bandwidth performance.

Frequently Asked Questions (FAQ)

Q: Can INA118UB directly replace INA118UBG4 in existing designs?

A: Yes. The INA118UB maintains identical electrical specifications across all parameters including slew rate, bandwidth, input bias current, input offset voltage, supply current, output current, and supply voltage range. Both parts use the 8-SOIC package with identical pinout and thermal characteristics. The primary difference is product status: INA118UB is active while INA118UBG4 is discontinued.

Q: What is the key difference between INA118UB and AD620 series substitutes?

A: The INA118UB provides a direct electrical match to the INA118UBG4. The AD620 series offers enhanced performance with higher slew rate (1.2 V/µs), increased bandwidth (1000 kHz), and lower input bias current (0.5 nA). However, AD620 parts require a minimum supply voltage of 4.6 V compared to 2.7 V for the INA118UBG4. If your application operates at supply voltages below 4.6 V, the INA118UB is the appropriate choice.

Q: Are there packaging differences between substitute parts?

A: All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package, maintaining mechanical and electrical compatibility. Packaging variants differ in tape and reel configurations: Tube, Cut Tape (CT) & Digi-Reel®, and Tape & Reel (TR). These differences affect handling and assembly processes but not electrical performance or PCB footprint.

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

A: The INA118UBG4 carries MSL 3 (168 Hours), while all Analog Devices substitutes carry MSL 1 (Unlimited). MSL 1 indicates superior moisture resistance and longer shelf life without baking requirements. This is an advantage for long-term storage and supply chain flexibility.

Q: Can AD621 series parts substitute for INA118UBG4 in precision applications?

A: AD621 parts match the 800 kHz bandwidth of the INA118UBG4 but specify 75 µV input offset voltage compared to 10 µV for the INA118UBG4. Applications requiring input offset voltage below 30 µV should use INA118UB or AD620BRZ variants. AD621 parts are suitable for applications where input offset voltage tolerance exceeds 75 µV.

Q: What supply voltage range should I verify before substitution?

A: The INA118UBG4 operates from 2.7 V to 36 V. The INA118UB maintains this range. All Analog Devices substitutes (AD620 and AD621 series) require minimum 4.6 V supply voltage. If your application uses supply voltages between 2.7 V and 4.6 V, only INA118UB is compatible.

Q: Are all substitute parts RoHS compliant?

A: Yes. The INA118UBG4 and all listed substitute parts are ROHS3 compliant. All parts carry REACH unaffected status and EAR99 ECCN classification, meeting regulatory requirements for commercial and industrial applications.

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