INA118PB Equivalent & Substitute Parts

Part Overview

The INA118PB is a single-circuit instrumentation amplifier manufactured by Texas Instruments in 8-PDIP through-hole packaging. This device operates across a wide supply voltage range of 2.7 V to 36 V and maintains active product status with 3417 units in stock. The INA118PB is ROHS3 compliant and suitable for precision signal conditioning applications requiring low input bias current and minimal input offset voltage. Equivalent and substitute parts are identified based on matching functional category, package type, mounting configuration, and electrical performance parameters within acceptable operational ranges.

Key Parameters

Parameter	INA118PB Value	Unit	Substitution Relevance
Amplifier Type	Instrumentation	—	Core functional requirement
Number of Circuits	1	—	Functional equivalence
Package / Case	8-DIP (0.300", 7.62mm)	—	Physical and electrical compatibility
Mounting Type	Through Hole	—	PCB assembly compatibility
Voltage - Supply Span (Min)	2.7 V	V	Minimum operating voltage requirement
Voltage - Supply Span (Max)	36 V	V	Maximum operating voltage limit
Operating Temperature	-40°C ~ 85°C	°C	Environmental operating range
Slew Rate	0.9 V/µs	V/µs	Signal response speed
-3dB Bandwidth	800 kHz	kHz	Frequency response specification
Current - Input Bias	1 nA	nA	Input impedance characteristic
Voltage - Input Offset	10 µV	µV	DC accuracy specification
Current - Supply	350 µA	µA	Power consumption
Current - Output / Channel	12 mA	mA	Output drive capability
RoHS Status	ROHS3 Compliant	—	Environmental compliance

Substitute Part Grouping Explanation

Substitute parts for the INA118PB are identified based on the following criteria:

Primary Matching Criteria:

Amplifier Type: Instrumentation (single circuit)
Package / Case: 8-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Supplier Device Package: 8-PDIP
Product Status: Active
RoHS Status: ROHS3 Compliant

Secondary Electrical Compatibility Criteria:

Voltage - Supply Span (Min): Must be ≤ 2.7 V to ensure operation in INA118PB applications
Voltage - Supply Span (Max): Must be ≥ 36 V to maintain upper voltage compatibility
Operating Temperature: Must support -40°C ~ 85°C range or be suitable for the intended application temperature window
Slew Rate, Bandwidth, Input Bias Current, Input Offset Voltage, Supply Current, and Output Current: Variations within these parameters are acceptable provided the substitute part meets or exceeds the performance envelope required by the application circuit design

Substitutes are grouped into two categories: Direct Equivalents (matching all key electrical parameters within tight tolerances) and Functional Alternatives (meeting core requirements with different performance trade-offs).

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	Bandwidth (kHz)	Input Bias (pA/nA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)
INA118PB	Texas Instruments	0.9	800	1 nA	10	350	12	2.7	36	-40 ~ 85
AD620ANZ	Analog Devices Inc.	1.2	1000	500 pA	30	900	18	4.6	36	-40 ~ 85
AD620BNZ	Analog Devices Inc.	1.2	1000	500 pA	15	900	18	4.6	36	-40 ~ 85
AD621ANZ	Analog Devices Inc.	1.2	800	500 pA	75	900	18	4.6	36	-40 ~ 85
AD622ANZ	Analog Devices Inc.	1.2	1000	2 nA	60	900	18	5.2	36	-40 ~ 85
AMP02EPZ	Analog Devices Inc.	6.0	1200	2 nA	20	5000	32	9	36	-40 ~ 85
AMP02FPZ	Analog Devices Inc.	6.0	1200	4 nA	40	5000	32	9	36	-40 ~ 85
LT1167CN8#PBF	Analog Devices Inc.	1.2	1000	80 pA	20	900	27	4.6	36	0 ~ 70
LT1167IN8#PBF	Analog Devices Inc.	1.2	1000	80 pA	20	900	27	4.6	36	-40 ~ 85
LT1168ACN8#PBF	Analog Devices Inc.	0.5	400	40 pA	15	350	32	4.6	36	0 ~ 70
LT1920CN8#PBF	Analog Devices Inc.	1.2	1000	500 pA	30	900	—	4.6	36	0 ~ 70

Engineering Selection Recommendations

Compatibility Assessment:

Substitutes for the INA118PB must satisfy the following non-negotiable requirements:

Package Compatibility: All substitute parts must be 8-DIP (0.300", 7.62mm) through-hole devices to ensure direct PCB footprint compatibility without layout redesign.
Functional Category: All substitutes must be single-circuit instrumentation amplifiers to maintain functional equivalence in signal conditioning applications.
Supply Voltage Range: The substitute part's minimum supply voltage specification must not exceed the application's minimum supply voltage. The INA118PB operates from 2.7 V minimum; substitutes with higher minimum voltage requirements (such as AD620ANZ at 4.6 V minimum) are suitable only for applications where the supply voltage floor is ≥ 4.6 V.
Operating Temperature Range: Substitutes with narrower temperature ranges (such as LT1167CN8#PBF and LT1168ACN8#PBF at 0°C ~ 70°C) are suitable only for applications operating within this narrower window. For full -40°C ~ 85°C operation, select substitutes with matching or wider temperature specifications.
Compliance Status: All listed substitutes maintain ROHS3 compliance and REACH Unaffected status, matching the environmental compliance profile of the INA118PB.

Performance Trade-offs:

Higher Slew Rate Devices (AMP02EPZ, AMP02FPZ): These parts offer 6.0 V/µs slew rate versus the INA118PB's 0.9 V/µs, providing faster signal response at the cost of higher supply current (5 mA versus 350 µA) and higher minimum supply voltage (9 V versus 2.7 V). Selection is appropriate for high-speed signal conditioning applications where power consumption and minimum voltage requirements are not constraints.
Lower Slew Rate Devices (LT1168ACN8#PBF): This part offers 0.5 V/µs slew rate with 350 µA supply current matching the INA118PB, but operates only to 0°C minimum temperature and has reduced bandwidth (400 kHz versus 800 kHz).
Voltage Offset Variations: Input offset voltage ranges from 10 µV (INA118PB) to 75 µV (AD621ANZ). Selection depends on DC accuracy requirements of the application circuit.

Frequently Asked Questions (FAQ)

Q1: Can I substitute AD620ANZ directly for INA118PB in a circuit powered by 3.3 V?

A: No. The AD620ANZ requires a minimum supply voltage of 4.6 V and will not operate reliably at 3.3 V. The INA118PB, specified for 2.7 V minimum, is the correct choice for 3.3 V applications. If substitution is necessary, verify that your application supply voltage meets the substitute part's minimum specification.

Q2: What is the key difference between AMP02EPZ and AMP02FPZ?

A: Both parts are identical except for input bias current specification: AMP02EPZ specifies 2 nA maximum input bias current, while AMP02FPZ specifies 4 nA maximum. Both share 6.0 V/µs slew rate, 1.2 MHz bandwidth, and 9 V minimum supply voltage. Selection depends on input bias current tolerance requirements.

Q3: Why do LT1167CN8#PBF and LT1167IN8#PBF have different temperature ranges despite identical electrical specifications?

A: LT1167CN8#PBF is rated 0°C ~ 70°C (commercial temperature range), while LT1167IN8#PBF is rated -40°C ~ 85°C (industrial temperature range). Both parts are electrically identical. Selection depends on the application's operating environment. For full -40°C ~ 85°C operation, use LT1167IN8#PBF.

Q4: Is LT1168ACN8#PBF a suitable substitute for INA118PB in all applications?

A: LT1168ACN8#PBF is suitable only for applications meeting these conditions: (1) operating temperature range 0°C ~ 70°C maximum, (2) bandwidth requirement ≤ 400 kHz, and (3) supply voltage ≥ 4.6 V. The reduced slew rate (0.5 V/µs) and bandwidth make this part unsuitable for high-speed signal conditioning applications.

Q5: Can I use AMP02FPZ in a 2.7 V to 5 V dual-supply application?

A: No. AMP02FPZ requires a minimum supply voltage of 9 V and is not suitable for applications with maximum supply voltage of 5 V. Verify that your application's supply voltage range falls within the substitute part's specified range before selection.

Q6: What is the primary substitution criterion for 8-DIP instrumentation amplifiers?

A: The primary criterion is package compatibility (8-DIP through-hole) combined with matching supply voltage range and operating temperature range. Electrical performance parameters (slew rate, bandwidth, input offset voltage) are secondary and depend on application-specific signal conditioning requirements.

Q7: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH Unaffected status, matching the environmental compliance profile of the INA118PB.

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