INA129PG4 Equivalent & Substitute Parts

Part Overview

The INA129PG4 is a precision instrumentation amplifier manufactured by Texas Instruments, housed in an 8-PDIP package. This single-circuit device is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and production continuity. The INA129PG4 operates across a wide supply voltage range of 4.5V to 36V with low input bias current and offset voltage specifications suitable for precision measurement applications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Instrumentation	—
Number of Circuits	1	—
Slew Rate	4	V/µs
-3dB Bandwidth	1.3	MHz
Current - Input Bias	2	nA
Voltage - Input Offset	10	µV
Current - Supply	700	µA
Current - Output / Channel	15	mA
Voltage - Supply Span (Min)	4.5	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-40 to 85	°C
Package / Case	8-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the INA129PG4 is determined by strict alignment of electrical and mechanical parameters within the instrumentation amplifier category. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

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

Secondary Electrical Parameters for Compatibility Assessment:

Slew Rate: 4V/µs (INA129PG4 baseline)
-3dB Bandwidth: 1.3 MHz (INA129PG4 baseline)
Current - Input Bias: 2 nA (INA129PG4 baseline)
Voltage - Input Offset: 10 µV (INA129PG4 baseline)
Current - Supply: 700 µA (INA129PG4 baseline)
Current - Output / Channel: 15 mA (INA129PG4 baseline)

Substitute parts are grouped based on whether they meet the primary criteria and how their secondary electrical parameters compare to the INA129PG4 baseline specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	-3dB Bandwidth (MHz)	Input Bias (nA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package
INA129PG4	Texas Instruments	Obsolete	4	1.3	2	10	700	15	4.5	36	-40 to 85	8-DIP
INA129P	Burr Brown	Active	4	1.3	20	10	700	15	4.5	36	-40 to 85	8-DIP
AD620ANZ	Analog Devices Inc.	Active	1.2	1	0.5	30	900	18	4.6	36	-40 to 85	8-DIP
AD620BNZ	Analog Devices Inc.	Active	1.2	1	0.5	15	900	18	4.6	36	-40 to 85	8-DIP
AD621ANZ	Analog Devices Inc.	Active	1.2	0.8	0.5	75	900	18	4.6	36	-40 to 85	8-DIP
AD621BNZ	Analog Devices Inc.	Active	1.2	0.8	0.5	50	900	18	4.6	36	-40 to 85	8-DIP
AD622ANZ	Analog Devices Inc.	Active	1.2	1	2	60	900	18	5.2	36	-40 to 85	8-DIP
AMP02EPZ	Analog Devices Inc.	Active	6	1.2	2	20	5000	32	9	36	-40 to 85	8-DIP
AMP02FPZ	Analog Devices Inc.	Active	6	1.2	4	40	5000	32	9	36	-40 to 85	8-DIP
LT1167AIN8#PBF	Analog Devices Inc.	Active	1.2	1	0.05	15	900	27	4.6	36	-40 to 85	8-DIP
LT1167CN8#PBF	Analog Devices Inc.	Active	1.2	1	0.08	20	900	—	4.6	36	0 to 70	8-DIP

Engineering Selection Recommendations

Direct Equivalent (Highest Compatibility):

INA129P (Burr Brown) is the direct equivalent to INA129PG4. Both devices share identical electrical specifications for slew rate, bandwidth, supply current, and output current. The primary difference is input bias current (20 nA vs. 2 nA), which represents a minor deviation. INA129P is active and RoHS3 compliant, making it the preferred replacement for direct substitution in existing designs.

Compatible Alternatives (Functional Substitutes):

AD620BNZ and AD620ANZ (Analog Devices Inc.) are functionally compatible instrumentation amplifiers in 8-DIP packages with identical operating temperature range and supply voltage span. These devices feature lower input bias current (0.5 pA) and improved input offset voltage specifications (15 µV and 30 µV respectively). However, they exhibit reduced slew rate (1.2 V/µs vs. 4 V/µs) and lower bandwidth (1 MHz vs. 1.3 MHz), with slightly higher supply current (900 µA vs. 700 µA). These trade-offs are acceptable for applications where lower input bias current is beneficial.

AD621ANZ and AD621BNZ (Analog Devices Inc.) provide similar compatibility with further reduced bandwidth (800 kHz) and higher input offset voltage specifications (75 µV and 50 µV). These are suitable for lower-frequency applications.

AD622ANZ (Analog Devices Inc.) matches the input bias current specification (2 nA) of the INA129PG4 but requires minimum supply voltage of 5.2V (vs. 4.5V), limiting compatibility in low-voltage applications.

Limited Compatibility (Conditional Substitutes):

LT1167AIN8#PBF (Analog Devices Inc.) operates within the full temperature and supply voltage range with superior input bias current (50 pA) and offset voltage (15 µV). However, reduced slew rate (1.2 V/µs) and bandwidth (1 MHz) require application-specific evaluation.

LT1167CN8#PBF is restricted to 0°C to 70°C operating temperature, making it unsuitable for applications requiring the full -40°C to 85°C range of the INA129PG4.

Not Recommended for Direct Substitution:

AMP02EPZ and AMP02FPZ require minimum supply voltage of 9V, incompatible with the 4.5V minimum specification of INA129PG4. These devices are suitable only for applications with higher supply voltage requirements.

Frequently Asked Questions (FAQ)

Q: Can INA129P directly replace INA129PG4 in existing designs?

A: Yes. INA129P is the direct equivalent with identical package, pinout, and nearly identical electrical specifications. The input bias current difference (20 nA vs. 2 nA) is the only notable variation and is acceptable for most applications. Both devices are RoHS3 compliant and operate across -40°C to 85°C with 4.5V to 36V supply range.

Q: What is the primary difference between INA129PG4 and AD620BNZ?

A: Both are 8-DIP instrumentation amplifiers with identical operating temperature and maximum supply voltage. AD620BNZ features superior input bias current (0.5 pA vs. 2 nA) and lower input offset voltage (15 µV vs. 10 µV). However, AD620BNZ has reduced slew rate (1.2 V/µs vs. 4 V/µs), lower bandwidth (1 MHz vs. 1.3 MHz), and higher supply current (900 µA vs. 700 µA). Substitution is valid for applications where these trade-offs are acceptable.

Q: Why is LT1167CN8#PBF not suitable as a substitute?

A: LT1167CN8#PBF operates only within 0°C to 70°C temperature range, whereas INA129PG4 requires -40°C to 85°C. This temperature restriction makes it incompatible with applications requiring full industrial temperature range operation.

Q: Can AMP02EPZ or AMP02FPZ replace INA129PG4?

A: No. Both AMP02 variants require minimum supply voltage of 9V, while INA129PG4 operates from 4.5V minimum. These devices are incompatible with low-voltage applications and should not be used as substitutes.

Q: What packaging considerations apply to these substitutes?

A: All listed substitute parts use identical 8-DIP (0.300", 7.62mm) through-hole packaging with the same pinout as INA129PG4. No PCB layout modifications are required for mechanical compatibility.

Q: Which substitute offers the best overall performance improvement?

A: LT1167AIN8#PBF provides the lowest input bias current (50 pA) and maintains full temperature and supply voltage compatibility. However, reduced slew rate and bandwidth require application-specific evaluation. For general-purpose replacement with minimal design changes, INA129P is recommended.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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