INA111APG4 Equivalent & Substitute Parts

Part Overview

The INA111APG4 is an instrumentation amplifier manufactured by Texas Instruments, featuring a single circuit in an 8-PDIP package. This device is classified as obsolete, though 999 pieces remain available in new original stock. The INA111APG4 delivers a slew rate of 17 V/µs with a -3dB bandwidth of 2 MHz, making it suitable for precision signal conditioning applications requiring high-speed amplification. Due to its obsolete status, identifying functionally equivalent active alternatives is essential for design continuity and long-term supply chain reliability.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	INA111APG4
Category	Linear, Amplifiers
Amplifier Type	Instrumentation
Number of Circuits	1
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Slew Rate	17 V/µs
-3dB Bandwidth	2 MHz
Current - Input Bias	2 pA
Voltage - Input Offset	200 µV
Current - Supply	3.3 mA
Current - Output / Channel	30 mA
Voltage - Supply Span (Min)	12 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the INA111APG4 is determined by strict alignment of electrical and mechanical parameters within the instrumentation amplifier category. The primary substitution criteria are:

Critical Matching Parameters:

Package type: 8-DIP (0.300", 7.62mm) with Through Hole mounting
Amplifier type: Instrumentation amplifier with single circuit
Supply voltage range: Minimum 12 V to maximum 36 V
Operating temperature range: -40°C to 85°C
Output current capability: Minimum 30 mA per channel
Input bias current: Low leakage (pA range)
RoHS3 compliance and MSL rating

Substitution Groups:

Group 1 - Direct Texas Instruments Replacement (Same Base Product): INA111AP represents the active production equivalent of the INA111APG4, maintaining identical electrical specifications while offering active product status and superior inventory availability.

Group 2 - Analog Devices LT1167 Series (Extended Temperature Range): LT1167AIN8#PBF, LT1167CN8#PBF, and LT1167IN8#PBF provide instrumentation amplification with -40°C to 85°C operating range, compatible supply voltage span (4.6 V to 36 V), and 8-DIP packaging. These devices feature lower input offset voltage (15-20 µV) and reduced input bias current (50-80 pA) compared to the INA111APG4.

Group 3 - Analog Devices LT1920 Series (Low-Power Alternative): LT1920CN8#PBF and LT1920IN8#PBF deliver instrumentation amplification with reduced supply current (900 µA) and compatible 8-DIP packaging. The LT1920IN8#PBF extends to -40°C to 85°C operating range.

Group 4 - Analog Devices AD621 Series (Commercial Temperature Range): AD621ANZ and AD621BNZ operate within 4.6 V to 36 V supply range with 8-DIP packaging. These devices feature lower supply current (900 µA) and reduced input offset voltage (50-75 µV) but operate within 0°C to 70°C commercial temperature range.

Group 5 - Analog Devices LT1168 Series (Ultra-Low Power): LT1168ACN8#PBF provides the lowest supply current (350 µA) with 8-DIP packaging and 0°C to 70°C operating range, suitable for power-constrained applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	Bandwidth / GBW	Input Bias (pA)	Input Offset (µV)	Supply Current (mA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package
INA111APG4	Texas Instruments	Obsolete	17	2 MHz	2	200	3.3	30	12	36	-40 to 85	8-DIP
INA111AP	Texas Instruments	Active	17	2 MHz	2	200	3.3	30	12	36	-40 to 85	8-DIP
LT1167AIN8#PBF	Analog Devices	Active	1.2	1 MHz	50	15	0.9	27	4.6	36	-40 to 85	8-DIP
LT1167CN8#PBF	Analog Devices	Active	1.2	1 MHz	80	20	0.9	—	4.6	36	0 to 70	8-DIP
LT1167IN8#PBF	Analog Devices	Active	1.2	1 MHz	80	20	0.9	27	4.6	36	-40 to 85	8-DIP
LT1168ACN8#PBF	Analog Devices	Active	0.5	400 kHz	40	15	0.35	32	4.6	36	0 to 70	8-DIP
LT1920CN8#PBF	Analog Devices	Active	1.2	1 MHz	500	30	0.9	—	4.6	36	0 to 70	8-DIP
LT1920IN8#PBF	Analog Devices	Active	1.2	1 MHz	500	30	0.9	27	4.6	36	-40 to 85	8-DIP
AD621ANZ	Analog Devices	Active	1.2	800 kHz	500	75	0.9	18	4.6	36	-40 to 85	8-DIP
AD621BNZ	Analog Devices	Active	1.2	800 kHz	500	50	0.9	18	4.6	36	-40 to 85	8-DIP
LT1167ACN8#PBF	Analog Devices	Active	1.2	1 MHz	50	15	0.9	—	4.6	36	0 to 70	8-DIP

Engineering Selection Recommendations

Primary Recommendation - INA111AP: The INA111AP is the direct active equivalent manufactured by Texas Instruments. It maintains identical electrical specifications to the INA111APG4 while offering active product status, superior inventory availability (2065 pieces), and Tube packaging. This selection eliminates obsolescence risk without requiring circuit redesign or performance compromise. RoHS3 compliance and REACH unaffected status are maintained.

Secondary Recommendation - LT1167AIN8#PBF: For applications where extended temperature operation (-40°C to 85°C) is required and lower input offset voltage (15 µV) is beneficial, the LT1167AIN8#PBF provides active product status with 1105 pieces in stock. This device operates within the full supply voltage range (4.6 V to 36 V) and delivers 27 mA output current. The reduced slew rate (1.2 V/µs versus 17 V/µs) and lower bandwidth (1 MHz versus 2 MHz) must be evaluated against application requirements.

Tertiary Recommendation - LT1920IN8#PBF: For power-constrained designs, the LT1920IN8#PBF reduces supply current to 900 µA while maintaining -40°C to 85°C operating range and 27 mA output current capability. Active product status with 1064 pieces in stock supports long-term availability.

Commercial Temperature Applications - AD621BNZ: When operating temperature is limited to -40°C to 85°C and lowest input offset voltage (50 µV) is prioritized, AD621BNZ provides active status with 3127 pieces in stock and reduced supply current (900 µA).

Ultra-Low Power Applications - LT1168ACN8#PBF: For battery-powered or energy-harvesting applications, LT1168ACN8#PBF delivers the lowest supply current (350 µA) with 32 mA output current capability. Commercial temperature range (0°C to 70°C) and reduced bandwidth (400 kHz) apply.

All recommended substitutes maintain 8-DIP Through Hole packaging, RoHS3 compliance, and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q1: Can INA111AP directly replace INA111APG4 without circuit modification?

A: Yes. The INA111AP is electrically and mechanically identical to the INA111APG4. Both devices feature 17 V/µs slew rate, 2 MHz bandwidth, 2 pA input bias current, 200 µV input offset voltage, and 8-DIP Through Hole packaging. The primary difference is product status: INA111AP is active with superior inventory availability, while INA111APG4 is obsolete.

Q2: What are the key differences between LT1167 and LT1920 series devices?

A: Both series operate within 4.6 V to 36 V supply range and feature 8-DIP packaging. LT1167 devices deliver 1 MHz gain-bandwidth product with 50-80 pA input bias current. LT1920 devices feature 1 MHz gain-bandwidth product with 500 pA input bias current and identical 900 µA supply current. Selection depends on input bias current tolerance and application sensitivity to leakage current.

Q3: Why does the INA111APG4 require 12 V minimum supply while substitutes operate at 4.6 V minimum?

A: The INA111APG4 was designed for higher supply voltage operation, reflecting its generation and application focus. Modern instrumentation amplifiers including LT1167, LT1920, and AD621 series support lower minimum supply voltages (4.6 V), enabling operation from single-supply or lower-voltage rail systems. Applications requiring 12 V minimum supply can use any substitute without modification.

Q4: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed—INA111AP, LT1167 series, LT1920 series, AD621 series, and LT1168ACN8#PBF—are RoHS3 compliant with REACH unaffected status, matching the compliance profile of the INA111APG4.

Q5: What is the impact of reduced slew rate in LT1167 and LT1920 substitutes?

A: The INA111APG4 delivers 17 V/µs slew rate, while LT1167 and LT1920 devices deliver 1.2 V/µs. Slew rate determines the maximum rate of output voltage change. Applications requiring high-speed transient response or handling fast input signal edges must verify that 1.2 V/µs meets performance requirements. LT1168ACN8#PBF delivers even lower slew rate (0.5 V/µs) and is suitable only for low-frequency applications.

Q6: Can LT1167CN8#PBF or LT1920CN8#PBF be used in -40°C to 85°C applications?

A: No. LT1167CN8#PBF and LT1920CN8#PBF operate within 0°C to 70°C commercial temperature range. For full -40°C to 85°C industrial temperature operation, use LT1167AIN8#PBF, LT1167IN8#PBF, LT1920IN8#PBF, AD621ANZ, or AD621BNZ.

Q7: What is the significance of input offset voltage differences?

A: The INA111APG4 features 200 µV input offset voltage. Substitutes offer lower values: LT1167 series (15-20 µV), LT1920 series (30 µV), AD621ANZ (75 µV), and AD621BNZ (50 µV). Lower input offset voltage reduces DC error in precision measurement applications. Applications with tight DC accuracy requirements benefit from lower offset voltage substitutes.

Q8: Are all substitute parts available in Tube packaging?

A: Yes. All substitute parts listed are supplied in Tube packaging, matching the packaging format of the INA111AP. The original INA111APG4 was supplied in Tube packaging as well.

Q9: Which substitute offers the lowest supply current?

A: LT1168ACN8#PBF delivers the lowest supply current at 350 µA, compared to 900 µA for LT1167, LT1920, and AD621 series, and 3.3 mA for the INA111APG4. However, LT1168ACN8#PBF operates within 0°C to 70°C commercial temperature range and delivers 400 kHz gain-bandwidth product, limiting its use to low-frequency applications.

Q10: What packaging considerations apply to Through Hole mounting?

A: All listed parts maintain 8-DIP (0.300", 7.62mm) Through Hole packaging, ensuring mechanical and electrical compatibility with existing PCB layouts designed for the INA111APG4. No PCB redesign is required for package conversion.

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