INA121P Equivalent & Substitute Parts

Part Overview

The INA121P is a single-channel instrumentation amplifier manufactured by Texas Instruments in 8-PDIP packaging. This device is classified as an active linear amplifier component designed for precision signal conditioning applications requiring low input bias current and low input offset voltage. The INA121P maintains Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent functional performance can be achieved within the specified electrical and mechanical parameters while maintaining compatibility with 8-DIP through-hole mounting requirements and the -40°C to 85°C operating temperature range.

Key Parameters

Parameter	INA121P Value	Unit	Substitution Relevance
Amplifier Type	Instrumentation	—	Critical
Number of Circuits	1	—	Critical
Slew Rate	0.7	V/µs	Performance
-3dB Bandwidth	600	kHz	Performance
Current - Input Bias	4	pA	Performance
Voltage - Input Offset	200	µV	Performance
Current - Supply	450	µA	Performance
Current - Output / Channel	14	mA	Performance
Voltage - Supply Span (Min)	4.5	V	Critical
Voltage - Supply Span (Max)	36	V	Critical
Operating Temperature	-40 to 85	°C	Critical
Mounting Type	Through Hole	—	Critical
Package / Case	8-DIP (0.300", 7.62mm)	—	Critical
RoHS Status	ROHS3 Compliant	—	Compliance

Substitute Part Grouping Explanation

Substitution eligibility for the INA121P is determined by the following mandatory criteria:

Critical Parameters (Must Match or Exceed):

Amplifier Type: Instrumentation (single-channel)
Mounting Type: Through Hole
Package: 8-DIP (0.300", 7.62mm)
Operating Temperature Range: Minimum -40°C to 85°C
Supply Voltage Range: Minimum 4.5V to 36V
RoHS3 Compliance

Performance Parameters (Acceptable if Equal or Superior):

Slew Rate: 0.7 V/µs or greater
-3dB Bandwidth: 600 kHz or greater
Input Bias Current: 4 pA or lower
Input Offset Voltage: 200 µV or lower
Supply Current: 450 µA or lower
Output Current per Channel: 14 mA or greater

Substitute parts are grouped into two categories based on their electrical performance relative to the INA121P baseline specifications.

Group 1: Enhanced Performance Substitutes Parts AD620ANZ, AD620BNZ, AD621ANZ, AD622ANZ, LT1167CN8#PBF, and LT1167IN8#PBF exceed the INA121P in slew rate, bandwidth, and input offset voltage while maintaining compatible supply voltage ranges and operating temperature specifications.

Group 2: High-Performance Substitutes Parts AMP02EPZ and AMP02FPZ provide significantly enhanced slew rate and bandwidth performance but require a minimum supply voltage of 9V, restricting their use to applications where the 4.5V minimum of the INA121P is not required.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	Bandwidth (kHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)
INA121P	Texas Instruments	0.7	600	4	200	450	14	4.5	36	-40 to 85
AD620ANZ	Analog Devices Inc.	1.2	1000	500	30	900	18	4.6	36	-40 to 85
AD620BNZ	Analog Devices Inc.	1.2	1000	500	15	900	18	4.6	36	-40 to 85
AD621ANZ	Analog Devices Inc.	1.2	800	500	75	900	18	4.6	36	-40 to 85
AD622ANZ	Analog Devices Inc.	1.2	1000	2000	60	900	18	5.2	36	-40 to 85
AMP02EPZ	Analog Devices Inc.	6.0	1200	2000	20	5000	32	9.0	36	-40 to 85
AMP02FPZ	Analog Devices Inc.	6.0	1200	4000	40	5000	32	9.0	36	-40 to 85
LT1167ACN8#PBF	Analog Devices Inc.	1.2	1000	50	15	900	—	4.6	36	0 to 70
LT1167CN8#PBF	Analog Devices Inc.	1.2	1000	80	20	900	—	4.6	36	0 to 70
LT1167IN8#PBF	Analog Devices Inc.	1.2	1000	80	20	900	27	4.6	36	-40 to 85
LT1168ACN8#PBF	Analog Devices Inc.	0.5	400	40	15	350	32	4.6	36	0 to 70

Engineering Selection Recommendations

For Full Temperature Range Compatibility (-40°C to 85°C):

The following parts maintain the complete operating temperature range of the INA121P: AD620ANZ, AD620BNZ, AD621ANZ, AD622ANZ, AMP02EPZ, AMP02FPZ, and LT1167IN8#PBF. All are RoHS3 compliant and REACH unaffected.

For Minimum Supply Voltage Compatibility (4.5V):

Parts compatible with 4.5V minimum supply are: AD620ANZ, AD620BNZ, AD621ANZ, LT1167ACN8#PBF, LT1167CN8#PBF, LT1167IN8#PBF, and LT1168ACN8#PBF. Parts AD622ANZ, AMP02EPZ, and AMP02FPZ require higher minimum supply voltages (5.2V and 9.0V respectively).

For Direct Pin-Compatible Replacement:

All listed substitute parts are packaged in 8-DIP (0.300", 7.62mm) through-hole configuration, enabling direct PCB mounting compatibility with the INA121P footprint.

For Reduced Power Consumption:

LT1168ACN8#PBF offers the lowest supply current at 350 µA compared to the INA121P baseline of 450 µA. However, this part operates only to 0°C minimum and provides reduced bandwidth (400 kHz).

For Enhanced Dynamic Performance:

AMP02EPZ and AMP02FPZ provide the highest slew rate (6.0 V/µs) and bandwidth (1.2 MHz), suitable for applications requiring faster signal response. These parts require minimum 9V supply voltage.

Frequently Asked Questions (FAQ)

Q: Can AD620ANZ directly replace INA121P in all applications?

A: AD620ANZ is mechanically and electrically compatible for applications operating above 4.6V supply voltage and within the -40°C to 85°C temperature range. The AD620ANZ provides superior slew rate (1.2 V/µs vs. 0.7 V/µs) and bandwidth (1 MHz vs. 600 kHz). Input bias current is higher (500 pA vs. 4 pA) and input offset voltage is lower (30 µV vs. 200 µV). Verify that the higher input bias current does not degrade system performance in your specific application.

Q: What is the key difference between AD620ANZ and AD620BNZ?

A: Both parts are identical except for input offset voltage specification. AD620BNZ specifies 15 µV maximum input offset voltage compared to 30 µV for AD620ANZ. Both share identical slew rate, bandwidth, supply current, and temperature range. AD620BNZ is the tighter-tolerance variant.

Q: Why do AMP02EPZ and AMP02FPZ require 9V minimum supply?

A: The AMP02 series is designed for higher-performance applications with enhanced slew rate (6.0 V/µs) and bandwidth (1.2 MHz). The internal circuit architecture requires a minimum 9V supply to maintain specified performance. These parts are not suitable for 4.5V supply applications.

Q: Can LT1167ACN8#PBF be used in -40°C applications?

A: No. LT1167ACN8#PBF operates only from 0°C to 70°C. For full -40°C to 85°C range compatibility, use LT1167IN8#PBF instead, which maintains identical electrical specifications but extends the operating temperature range.

Q: Is LT1168ACN8#PBF suitable as a direct INA121P replacement?

A: LT1168ACN8#PBF is not recommended as a direct replacement. While it offers lower supply current (350 µA) and lower input offset voltage (15 µV), it provides significantly reduced bandwidth (400 kHz vs. 600 kHz) and lower slew rate (0.5 V/µs vs. 0.7 V/µs). Additionally, it operates only to 0°C minimum temperature. Use this part only when reduced bandwidth and lower power consumption are acceptable trade-offs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the compliance status of the INA121P.

Q: What is the primary substitution criterion for instrumentation amplifiers?

A: The primary criterion is maintaining compatible supply voltage range and operating temperature range. Secondary criteria include slew rate, bandwidth, input bias current, and input offset voltage. All substitute parts must be single-channel instrumentation amplifiers in 8-DIP through-hole packaging.

Q: Can I use AMP02FPZ in a 5V supply application?

A: No. AMP02FPZ requires a minimum supply voltage of 9V. It is not suitable for 5V or lower supply applications.

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