LM6172IM Equivalent & Substitute Parts

Part Overview

The LM6172IM is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, configured as a dual-channel operational amplifier in an 8-SOIC surface mount package. This device is classified as obsolete, indicating discontinued production and limited availability in the original form. The LM6172IM delivers high-speed amplification with a 3000 V/µs slew rate and 100 MHz gain bandwidth product, suitable for applications requiring fast signal processing and wide bandwidth performance. Due to its obsolete status, equivalent substitute parts with active production status are necessary for new designs and ongoing component procurement.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	2	Channels
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 Range	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM6172IM is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: Voltage Feedback
Number of Circuits: 2 channels
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C to 85°C minimum
Voltage Supply Span: 5.5 V to 36 V minimum
Slew Rate: 3000 V/µs or greater
Gain Bandwidth Product: 100 MHz or greater
Current - Output / Channel: 90 mA or greater

Direct Equivalents (Identical Parameters): Parts meeting all primary criteria with identical electrical specifications are classified as direct equivalents. These include packaging variants of the LM6172 base product from Texas Instruments.

Parametric Substitutes (Functional Equivalents): Parts that meet the core mechanical and package requirements but with different electrical performance characteristics are classified as parametric substitutes. These devices maintain voltage feedback amplifier topology and dual-channel configuration but may have reduced slew rate, bandwidth, or output current specifications. Parametric substitutes are suitable only when application requirements permit relaxed performance specifications.

Non-Equivalent Parts (Functional Alternatives): Parts that deviate significantly from core parameters—such as general-purpose amplifier topology, reduced output current, or incompatible operating temperature ranges—are listed as functional alternatives only and require full circuit re-evaluation before substitution.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	-3dB BW (MHz)	Input Bias (µA)	Input Offset (µV)	Supply Current (mA)	Output Current (mA)	Temp Range (°C)	Package
LM6172IM	Texas Instruments	Obsolete	3000	100	160	1.2	400	4.6	90	-40 to 85	8-SOIC
LM6172IMX/NOPB	Texas Instruments	Active	3000	100	160	1.2	400	4.6	90	-40 to 85	8-SOIC
LM6172IM/NOPB	Texas Instruments	Last Time Buy	3000	100	160	1.2	400	4.6	90	-40 to 85	8-SOIC
AD826ARZ	Analog Devices Inc.	Active	350	50	50	3.3	500	6.6	50	-40 to 85	8-SOIC
LT1355CS8	Analog Devices Inc.	Active	400	12	—	0.080	300	1	30	0 to 70	8-SOIC
LT1355CS8#PBF	Analog Devices Inc.	Active	400	12	—	0.080	300	1	30	0 to 70	8-SOIC
LT1355CS8#TR	Analog Devices Inc.	Active	400	12	—	0.080	300	1	30	0 to 70	8-SOIC
LT1355CS8#TRPBF	Analog Devices Inc.	Active	400	12	—	0.080	300	1	30	0 to 70	8-SOIC
LT1358CS8	Analog Devices Inc.	Active	600	25	—	0.120	200	2	30	-40 to 85	8-SOIC
LT1358CS8#PBF	Analog Devices Inc.	Active	600	25	—	0.120	200	2	30	-40 to 85	8-SOIC
BA3404F-E2	Rohm Semiconductor	Active	1.2	1.2	—	0.070	2000	2	30	-40 to 85	8-SOP

Engineering Selection Recommendations

Direct Equivalent Selection:

The LM6172IMX/NOPB is the primary recommended direct equivalent. This part maintains identical electrical specifications to the LM6172IM while offering active product status from Texas Instruments. The IMX/NOPB suffix indicates lead-free (NOPB) processing and extended temperature range qualification. This part is suitable for direct substitution in all applications previously designed for the LM6172IM.

The LM6172IM/NOPB is available as a secondary option with Last Time Buy status, indicating limited future availability. This part is electrically identical but should be selected only when LM6172IMX/NOPB inventory is unavailable.

Parametric Substitute Selection:

The LT1358CS8 and LT1358CS8#PBF are parametric substitutes meeting the operating temperature range requirement (-40°C to 85°C) with active product status. These parts provide reduced slew rate (600 V/µs versus 3000 V/µs) and reduced gain bandwidth product (25 MHz versus 100 MHz), along with significantly reduced output current (30 mA versus 90 mA). Selection of LT1358CS8 variants is appropriate only for applications where bandwidth and slew rate specifications can be relaxed.

The AD826ARZ is a parametric substitute from Analog Devices with active status. This part exhibits substantially reduced performance across slew rate (350 V/µs), gain bandwidth product (50 MHz), and output current (50 mA). The AD826ARZ is suitable only for low-frequency or moderate-speed applications.

The LT1355CS8 series (including #PBF, #TR, and #TRPBF variants) represents a lower-performance alternative with severely reduced specifications: 400 V/µs slew rate, 12 MHz bandwidth, and 30 mA output current. Additionally, the LT1355CS8 series operates only to 70°C maximum, failing to meet the -40°C to 85°C requirement. This part is not recommended for direct substitution.

Non-Equivalent Alternative:

The BA3404F-E2 from Rohm Semiconductor is a general-purpose amplifier with push-pull output topology, fundamentally different from the voltage feedback architecture of the LM6172IM. This part exhibits extremely limited bandwidth (1.2 MHz), minimal slew rate (1.2 V/µs), and reduced output current (30 mA). The BA3404F-E2 package (8-SOP, 4.40mm width) differs from the LM6172IM package (8-SOIC, 3.90mm width). This part is not suitable for substitution.

Compliance and Certification:

All recommended direct equivalents and parametric substitutes maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original LM6172IM specifications. All parts carry EAR99 export classification and HTSUS code 8542.33.0001.

Frequently Asked Questions (FAQ)

Q: Can the LM6172IMX/NOPB be used as a direct replacement for the LM6172IM?

A: Yes. The LM6172IMX/NOPB is electrically and mechanically identical to the LM6172IM. Both parts share identical slew rate (3000 V/µs), gain bandwidth product (100 MHz), output current (90 mA), and operating temperature range (-40°C to 85°C). The primary difference is product status: LM6172IMX/NOPB is active production while LM6172IM is obsolete. The IMX/NOPB variant is the recommended replacement for new procurement.

Q: What is the difference between LM6172IMX/NOPB and LM6172IM/NOPB?

A: Both parts are electrically identical. The LM6172IM/NOPB carries Last Time Buy status, indicating limited future availability and approaching end-of-life. The LM6172IMX/NOPB is in active production with full availability. For new designs and ongoing procurement, LM6172IMX/NOPB is the preferred selection.

Q: Can the LT1358CS8 replace the LM6172IM in high-speed applications?

A: No. The LT1358CS8 provides only 600 V/µs slew rate and 25 MHz bandwidth compared to the LM6172IM's 3000 V/µs and 100 MHz specifications. Additionally, output current is reduced from 90 mA to 30 mA. The LT1358CS8 is suitable only for applications where these reduced specifications are acceptable. Full circuit re-evaluation is required before substitution.

Q: Are there package compatibility issues when substituting the LM6172IM?

A: The LM6172IMX/NOPB, LM6172IM/NOPB, AD826ARZ, and all LT1355/LT1358 variants use identical 8-SOIC packaging (0.154", 3.90mm width). These parts are pin-compatible and mechanically interchangeable on printed circuit boards. The BA3404F-E2 uses 8-SOP packaging (0.173", 4.40mm width) and is not mechanically compatible.

Q: What is the significance of the #PBF, #TR, and #TRPBF suffixes on Analog Devices parts?

A: These suffixes indicate packaging and processing variants. #PBF indicates lead-free (Pb-free) processing in tube packaging. #TR indicates tape and reel packaging. #TRPBF indicates lead-free processing in tape and reel packaging. All variants of a given base part number (e.g., LT1355CS8) share identical electrical specifications; the suffix reflects only packaging format and lead-free compliance.

Q: Is the AD826ARZ suitable for direct substitution?

A: The AD826ARZ is not suitable for direct substitution in applications requiring the full performance of the LM6172IM. The AD826ARZ provides only 350 V/µs slew rate (versus 3000 V/µs), 50 MHz bandwidth (versus 100 MHz), and 50 mA output current (versus 90 mA). Substitution is appropriate only for low-frequency or moderate-speed applications where these reduced specifications are acceptable.

Q: What compliance certifications apply to substitute parts?

A: All recommended substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating. All parts carry EAR99 export classification. These certifications match the original LM6172IM specifications, ensuring regulatory compliance in applications requiring ROHS3 certification.

Q: Why is the LT1355CS8 not recommended despite active product status?

A: The LT1355CS8 exhibits three critical limitations: (1) Operating temperature range limited to 0°C to 70°C, failing to meet the -40°C to 85°C requirement; (2) Severely reduced slew rate (400 V/µs versus 3000 V/µs) and bandwidth (12 MHz versus 100 MHz); (3) Reduced output current (30 mA versus 90 mA). These limitations make the LT1355CS8 unsuitable for applications designed around the LM6172IM's performance envelope.

Q: What inventory considerations apply to substitute selection?

A: The LM6172IMX/NOPB offers the highest inventory availability (41,866 pcs) among direct equivalents. The LM6172IM/NOPB provides 5,203 pcs with Last Time Buy status. Among parametric substitutes, LT1355CS8#TRPBF offers the highest inventory (50,300 pcs). Inventory levels should be verified with suppliers for long-term procurement planning.

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