LM6172IN Equivalent & Substitute Parts

Part Overview

The LM6172IN is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, featuring two independent circuits in an 8-DIP package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement requirements. The LM6172IN operates across a wide supply voltage range of 5.5V to 36V with a slew rate of 3000V/µs and gain bandwidth product of 100 MHz, making it suitable for high-speed signal conditioning applications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	2	—
Slew Rate	3000	V/µs
Gain Bandwidth Product	100	MHz
-3dB Bandwidth	160	MHz
Current - Input Bias	1.2	µA
Voltage - Input Offset	400	µV
Current - Supply (x2 Channels)	4.6	mA
Current - Output / Channel	90	mA
Voltage - Supply Span (Min)	5.5	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	—

Substitute Part Grouping Explanation

Substitution of the LM6172IN is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: Voltage Feedback
Number of Circuits: 2
Package / Case: 8-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Supplier Device Package: 8-PDIP

Secondary Compatibility Parameters:

Slew Rate: 3000V/µs (or higher)
Gain Bandwidth Product: 100 MHz (or higher)
Current - Output / Channel: 90 mA (or higher)
Voltage - Supply Span: 5.5V to 36V (or compatible range)
Operating Temperature: -40°C to 85°C (or compatible range)

The substitute parts identified below maintain the core functional architecture (dual voltage feedback amplifier in 8-DIP package) while offering varying performance characteristics. Selection depends on application-specific requirements for slew rate, bandwidth, and supply voltage compatibility.

Parameter Comparison

Parameter	LM6172IN	LM6172IN/NOPB	LT1355CN8#PBF	LT1358CN8#PBF	LT1361CN8#PBF	LT1364CN8#PBF
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback
Number of Circuits	2	2	2	2	2	2
Slew Rate (V/µs)	3000	3000	400	600	800	1000
Gain Bandwidth Product (MHz)	100	100	12	25	50	70
-3dB Bandwidth (MHz)	160	160	—	—	—	—
Current - Input Bias (µA)	1.2	1.2	0.08	0.12	0.3	0.6
Voltage - Input Offset (µV)	400	400	300	200	300	500
Current - Supply (mA, x2 Channels)	4.6	4.6	1	2	4	6.3
Current - Output / Channel (mA)	90	90	30	30	34	60
Voltage - Supply Span (Min, V)	5.5	5.5	5	5	5	5
Voltage - Supply Span (Max, V)	36	36	30	30	30	36
Operating Temperature (°C)	-40 to 85	-40 to 85	0 to 70	-40 to 85	-40 to 85	0 to 70
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Last Time Buy	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Highest Compatibility):

LM6172IN/NOPB is the direct equivalent manufactured by Texas Instruments. This part maintains identical electrical specifications and package configuration. The primary distinction is product status: LM6172IN/NOPB is classified as Last Time Buy, indicating limited future availability. This part is ROHS3 compliant, addressing regulatory requirements where the original LM6172IN is non-compliant.

Performance-Tiered Alternatives (Analog Devices LT Series):

The Analog Devices LT1358CN8#PBF, LT1361CN8#PBF, and LT1364CN8#PBF offer active product status with ROHS3 compliance. These parts are organized by performance tier:

LT1358CN8#PBF: Intermediate performance (600V/µs slew rate, 25 MHz bandwidth). Supports -40°C to 85°C operating temperature range matching the original LM6172IN. Supply voltage range limited to 5V to 30V.
LT1361CN8#PBF: Mid-range performance (800V/µs slew rate, 50 MHz bandwidth). Supports -40°C to 85°C operating temperature range. Supply voltage range limited to 5V to 30V.
LT1364CN8#PBF: Higher performance (1000V/µs slew rate, 70 MHz bandwidth). Supports 5V to 36V supply voltage range matching the original LM6172IN maximum specification. Operating temperature limited to 0°C to 70°C.
LT1355CN8#PBF: Lower performance option (400V/µs slew rate, 12 MHz bandwidth). Lowest supply current consumption (1 mA x2 channels). Operating temperature limited to 0°C to 70°C. Supply voltage range limited to 5V to 30V.

Selection Basis:

Applications requiring the full 3000V/µs slew rate and 100 MHz bandwidth of the original LM6172IN have no direct active substitute. LM6172IN/NOPB remains the closest match but faces Last Time Buy status. For new designs, Analog Devices alternatives must be evaluated against specific application bandwidth and slew rate requirements. Supply voltage compatibility and operating temperature range are critical selection parameters.

Frequently Asked Questions (FAQ)

Q: Can LT1358CN8#PBF directly replace LM6172IN in existing designs?

A: LT1358CN8#PBF maintains the same 8-DIP package and dual voltage feedback amplifier architecture. However, electrical performance differs significantly: slew rate is 600V/µs versus 3000V/µs, and gain bandwidth product is 25 MHz versus 100 MHz. Supply voltage maximum is 30V versus 36V. Direct substitution is not recommended without circuit redesign and performance validation.

Q: What is the difference between LM6172IN and LM6172IN/NOPB?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications and 8-DIP package. The primary differences are packaging format (Tube for LM6172IN/NOPB) and product status (Obsolete versus Last Time Buy). LM6172IN/NOPB is ROHS3 compliant while LM6172IN is non-compliant. LM6172IN/NOPB is the preferred choice for new procurement.

Q: Which substitute part offers the closest performance match to LM6172IN?

A: No active substitute offers equivalent performance across all parameters. LT1364CN8#PBF provides the highest slew rate (1000V/µs) and bandwidth (70 MHz) among active alternatives, though still below the original 3000V/µs and 100 MHz specifications. LT1364CN8#PBF also matches the 36V maximum supply voltage. Operating temperature range is limited to 0°C to 70°C.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. LM6172IN/NOPB and all Analog Devices alternatives (LT1355CN8#PBF, LT1358CN8#PBF, LT1361CN8#PBF, LT1364CN8#PBF) are ROHS3 compliant. The original LM6172IN is RoHS non-compliant.

Q: What is the supply voltage compatibility range for each substitute?

A: LM6172IN and LM6172IN/NOPB support 5.5V to 36V. LT1355CN8#PBF, LT1358CN8#PBF, and LT1361CN8#PBF support 5V to 30V. LT1364CN8#PBF supports 5V to 36V, matching the original maximum specification.

Q: Which substitute has the lowest power consumption?

A: LT1355CN8#PBF has the lowest supply current at 1 mA (x2 channels). This part is suitable for power-constrained applications but offers the lowest performance specifications (400V/µs slew rate, 12 MHz bandwidth).

Q: Can I use LT1361CN8#PBF in applications requiring -40°C to 85°C operation?

A: Yes. LT1361CN8#PBF supports the full -40°C to 85°C operating temperature range. LT1355CN8#PBF and LT1364CN8#PBF are limited to 0°C to 70°C.

Q: What is the inventory status of these parts?

A: LM6172IN has 2935 units in stock (Obsolete status). LM6172IN/NOPB has 1156 units (Last Time Buy). Analog Devices alternatives have higher inventory: LT1355CN8#PBF (1900 units), LT1358CN8#PBF (2120 units), LT1361CN8#PBF (3586 units), and LT1364CN8#PBF (2100 units), all with Active product status.

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