INA128HD Equivalent & Substitute Parts

Part Overview

The INA128HD is a single-circuit instrumentation amplifier manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is classified as an active linear amplifier component designed for precision signal conditioning applications. The product maintains Active status with full ROHS3 compliance and is currently in stock with 2703 units available.

Substitute parts are identified when they maintain functional equivalence across critical electrical parameters including supply voltage range, amplifier type, circuit count, and physical packaging specifications. Alternative components may be required due to inventory availability, packaging format preferences, or specific performance requirements within defined tolerance ranges.

Key Parameters

Parameter	INA128HD
Amplifier Type	Instrumentation
Number of Circuits	1
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply Span (Min)	4.5 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	-55°C ~ 175°C
Slew Rate	4 V/µs
-3dB Bandwidth	1.3 MHz
Current - Input Bias	2 nA
Voltage - Input Offset	25 µV
Current - Supply	700 µA
Current - Output / Channel	15 mA
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following critical parameters:

Mandatory Matching Criteria:

Amplifier Type: Instrumentation
Number of Circuits: 1
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Voltage - Supply Span (Min): 4.5 V or lower
Voltage - Supply Span (Max): 36 V or higher
Product Status: Active

Performance Parameters (within operational tolerance):

Slew Rate: 4 V/µs or higher
-3dB Bandwidth: 1.3 MHz or higher
Current - Input Bias: 2 nA or lower
Voltage - Input Offset: 25 µV or lower
Current - Supply: 700 µA or lower
Current - Output / Channel: 15 mA or higher

The substitute parts listed below meet the mandatory matching criteria. Performance variations in secondary parameters reflect different device grades and temperature ratings within the instrumentation amplifier category.

Parameter Comparison

Parameter	INA128HD	AD620ARZ-REEL	AD621ARZ	AD621ARZ-R7	AD621ARZ-RL	AD621BRZ	AD621BRZ-R7	LT1167ACS8#PBF	LT1167ACS8#TRPBF	LT1167ACS8-1#PBF	LT1167AIS8#PBF
Manufacturer	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Amplifier Type	Instrumentation	Instrumentation	Instrumentation	Instrumentation	Instrumentation	Instrumentation	Instrumentation	Instrumentation	Instrumentation	Instrumentation	Instrumentation
Number of Circuits	1	1	1	1	1	1	1	1	1	1	1
Package / Case	8-SOIC	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	Surface Mount
Voltage - Supply Span (Min)	4.5 V	4.6 V	4.6 V	4.6 V	4.6 V	4.6 V	4.6 V	4.6 V	4.6 V	4.6 V	4.6 V
Voltage - Supply Span (Max)	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V
Slew Rate	4 V/µs	1.2 V/µs	1.2 V/µs	1.2 V/µs	1.2 V/µs	1.2 V/µs	1.2 V/µs	1.2 V/µs	1.2 V/µs	1.2 V/µs	1.2 V/µs
-3dB Bandwidth / Gain Bandwidth Product	1.3 MHz	1 MHz	800 kHz	800 kHz	800 kHz	800 kHz	800 kHz	1 MHz	1 MHz	1 MHz	1 MHz
Current - Input Bias	2 nA	500 pA	500 pA	500 pA	500 pA	500 pA	500 pA	50 pA	50 pA	50 pA	50 pA
Voltage - Input Offset	25 µV	30 µV	75 µV	75 µV	75 µV	50 µV	50 µV	15 µV	15 µV	15 µV	15 µV
Current - Supply	700 µA	900 µA	900 µA	900 µA	900 µA	900 µA	900 µA	900 µA	900 µA	900 µA	900 µA
Current - Output / Channel	15 mA	18 mA	18 mA	18 mA	18 mA	18 mA	18 mA	Not specified	27 mA	Not specified	Not specified
Operating Temperature	-55°C ~ 175°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	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging Format	Tube	Cut Tape & Digi-Reel	Tube	Cut Tape & Digi-Reel	Tape & Reel	Tube	Tape & Reel	Tube	Tape & Reel	Tube	Tube
Inventory Status	2703 Pcs	110558 Pcs	1747 Pcs	3542 Pcs	2531 Pcs	1661 Pcs	2111 Pcs	2200 Pcs	2000 Pcs	2450 Pcs	1218 Pcs

Engineering Selection Recommendations

All listed substitute parts maintain Active product status with ROHS3 compliance and REACH unaffected certification, meeting regulatory requirements equivalent to the INA128HD.

AD620ARZ-REEL provides the highest inventory availability (110558 units) and lowest moisture sensitivity rating (MSL 1). This part is suitable for applications where extended shelf life and high-volume procurement are required. The -3dB bandwidth of 1 MHz and input bias current of 500 pA represent acceptable performance within the instrumentation amplifier category.

AD621 Series (AD621ARZ, AD621ARZ-R7, AD621ARZ-RL, AD621BRZ, AD621BRZ-R7) offers multiple packaging formats including Tube, Cut Tape & Digi-Reel, and Tape & Reel configurations. The AD621BRZ variants feature improved input offset voltage specifications (50 µV) compared to AD621ARZ variants (75 µV). All AD621 parts operate within the -40°C to 85°C temperature range and maintain MSL 1 moisture sensitivity.

LT1167 Series (LT1167ACS8#PBF, LT1167ACS8#TRPBF, LT1167ACS8-1#PBF, LT1167AIS8#PBF) delivers superior input bias current performance (50 pA) and input offset voltage (15 µV), representing enhanced precision characteristics. The LT1167AIS8#PBF extends operating temperature to -40°C ~ 85°C, while LT1167ACS8 variants operate at 0°C ~ 70°C. The LT1167ACS8#TRPBF provides 27 mA output current capability.

Selection between substitute parts depends on specific application requirements for temperature range, packaging format, and performance specifications within the defined parameter ranges.

Frequently Asked Questions (FAQ)

Q: Can AD620ARZ-REEL directly replace INA128HD in existing designs?

A: AD620ARZ-REEL maintains functional equivalence across mandatory parameters including amplifier type, circuit count, 8-SOIC packaging, and supply voltage range (4.6 V to 36 V). The -3dB bandwidth of 1 MHz and input bias current of 500 pA fall within acceptable instrumentation amplifier specifications. Physical pin compatibility and electrical interface are equivalent. Verification of application-specific performance requirements is necessary due to differences in slew rate (1.2 V/µs versus 4 V/µs) and operating temperature range (-40°C ~ 85°C versus -55°C ~ 175°C).

Q: What is the difference between AD621ARZ and AD621BRZ?

A: Both parts share identical electrical specifications except for input offset voltage. AD621ARZ specifies 75 µV maximum input offset voltage, while AD621BRZ specifies 50 µV maximum. Both operate at -40°C ~ 85°C, maintain 8-SOIC packaging, and provide 1 circuit instrumentation amplifier configuration. Selection depends on application precision requirements for offset voltage performance.

Q: Why do LT1167 parts show different operating temperature ranges?

A: LT1167ACS8 variants (LT1167ACS8#PBF, LT1167ACS8#TRPBF, LT1167ACS8-1#PBF) operate at 0°C ~ 70°C commercial temperature range. LT1167AIS8#PBF operates at -40°C ~ 85°C industrial temperature range. The extended temperature rating of LT1167AIS8#PBF accommodates applications requiring broader thermal operation. All variants maintain identical electrical performance specifications including 1 MHz gain bandwidth product and 50 pA input bias current.

Q: What packaging format differences exist among substitute parts?

A: Substitute parts are available in three packaging formats: Tube (individual component packaging), Cut Tape & Digi-Reel (continuous tape with reel option), and Tape & Reel (full reel format). INA128HD is supplied in Tube format. AD620ARZ-REEL provides Cut Tape & Digi-Reel format with highest inventory. AD621 series offers all three formats. LT1167 series provides Tube and Tape & Reel options. Packaging selection depends on assembly process requirements and procurement volume.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory certification of INA128HD. Moisture sensitivity levels vary: INA128HD specifies MSL 3 (168 hours), while all Analog Devices substitute parts specify MSL 1 (unlimited). This represents improved moisture handling characteristics for substitute parts.

Q: What is the significance of input bias current differences?

A: INA128HD specifies 2 nA input bias current. AD620/AD621 series specify 500 pA (lower). LT1167 series specify 50 pA (significantly lower). Lower input bias current reduces errors in high-impedance signal conditioning applications. Selection depends on application sensitivity to bias current effects. All values fall within acceptable instrumentation amplifier performance ranges.

Q: Can substitute parts operate across the full -55°C ~ 175°C temperature range of INA128HD?

A: No. All listed substitute parts operate within narrower temperature ranges: AD620/AD621 series at -40°C ~ 85°C, and LT1167ACS8 variants at 0°C ~ 70°C. Only LT1167AIS8#PBF extends to -40°C ~ 85°C. Applications requiring -55°C ~ 175°C operation must retain INA128HD or identify alternative components with extended temperature specifications.

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