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LM6172IMX Equivalent & Substitute Parts
Part Overview
The LM6172IMX 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 Last Time Buy, indicating discontinued production with limited inventory availability. The LM6172IMX operates across a wide supply voltage range of 5.5V to 36V and is suitable for applications requiring high slew rate performance and moderate bandwidth characteristics. Alternative equivalent parts are necessary due to product status transition and to ensure long-term design continuity and supply chain reliability.
Substiute Parts
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 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
Substitute parts for the LM6172IMX are classified into two distinct categories based on electrical and mechanical compatibility:
Category 1: Parametric Equivalents (Direct Functional Replacement)
The LM6172IMX/NOPB represents a parametric equivalent manufactured by Texas Instruments. This part maintains identical electrical specifications across all critical parameters: 3000V/µs slew rate, 100 MHz gain bandwidth product, 160 MHz -3dB bandwidth, 1.2 µA input bias current, 400 µV input offset voltage, 4.6 mA supply current per dual channels, and 90 mA output current per channel. The supply voltage range (5.5V to 36V) and operating temperature range (-40°C to 85°C) are identical. The package configuration remains 8-SOIC with 0.154" width. The primary distinction is product status: LM6172IMX/NOPB is Active, whereas the original LM6172IMX is Last Time Buy. Both parts are ROHS3 compliant with MSL 1 rating.
Category 2: Manufacturer-Recommended Substitutes (Performance-Variant Alternatives)
Three manufacturer-recommended substitute families are provided: the LT1355 series (Analog Devices), the LT1358 series (Analog Devices), and the BA3404F-E2 (Rohm Semiconductor). These parts share the core architecture of dual-channel voltage feedback amplifiers in 8-SOIC packages but exhibit different electrical performance characteristics.
The LT1355 series (LT1355CS8, LT1355CS8#PBF, LT1355CS8#TR, LT1355CS8#TRPBF) operates with reduced slew rate (400V/µs versus 3000V/µs), lower gain bandwidth product (12 MHz versus 100 MHz), and narrower -3dB bandwidth (not specified but proportionally lower). Input bias current is significantly lower at 80 nA. Supply voltage range is narrower (5V to 30V). Operating temperature range is restricted to 0°C to 70°C. These characteristics make the LT1355 series suitable for applications where lower bandwidth and reduced power consumption are acceptable trade-offs.
The LT1358 series (LT1358CS8, LT1358CS8#PBF, LT1358CS8#TR, LT1358CS8#TRPBF) provides intermediate performance between the LM6172IMX and LT1355 series. Slew rate is 600V/µs, gain bandwidth product is 25 MHz, and input bias current is 120 nA. Supply voltage range extends to 5V to 30V. Operating temperature range is -40°C to 85°C, matching the original part. These characteristics position the LT1358 series as a moderate-performance alternative.
The BA3404F-E2 (Rohm Semiconductor) is a general-purpose amplifier with push-pull output configuration. This part exhibits significantly different electrical characteristics: 1.2V/µs slew rate, 1.2 MHz gain bandwidth product, 70 nA input bias current, and 2 mV input offset voltage. Supply voltage range is 4V to 36V. Output current per channel is limited to 30 mA. This part is suitable only for low-frequency, low-bandwidth applications and represents a performance-reduced alternative.
Substitution Logic
Substitution eligibility is determined by the following criteria:
- Dual-channel configuration (2 circuits required)
- Voltage feedback amplifier topology
- 8-SOIC package with 0.154" width (3.90mm)
- Surface mount mounting type
- ROHS3 compliance and MSL 1 rating
- Supply voltage range overlap with application requirements
- Operating temperature range compatibility
- Slew rate and bandwidth requirements of the target application
Parts are grouped by performance tier: direct parametric equivalents maintain all electrical specifications, while manufacturer-recommended substitutes offer reduced performance suitable for specific application constraints.
Parameter Comparison
| Parameter | LM6172IMX | LM6172IMX/NOPB | LT1355CS8#TRPBF | LT1358CS8#TRPBF | BA3404F-E2 |
|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Analog Devices Inc. | Analog Devices Inc. | Rohm Semiconductor |
| Amplifier Type | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | General Purpose |
| Number of Circuits | 2 | 2 | 2 | 2 | 2 |
| Slew Rate (V/µs) | 3000 | 3000 | 400 | 600 | 1.2 |
| Gain Bandwidth Product (MHz) | 100 | 100 | 12 | 25 | 1.2 |
| -3dB Bandwidth (MHz) | 160 | 160 | — | — | — |
| Current - Input Bias (µA) | 1.2 | 1.2 | 0.08 | 0.12 | 0.07 |
| Voltage - Input Offset (µV) | 400 | 400 | 300 | 200 | 2000 |
| Current - Supply (mA, x2 Channels) | 4.6 | 4.6 | 1 | 2 | 2 |
| Current - Output / Channel (mA) | 90 | 90 | 30 | 30 | 30 |
| Voltage - Supply Span Min (V) | 5.5 | 5.5 | 5 | 5 | 4 |
| Voltage - Supply Span Max (V) | 36 | 36 | 30 | 30 | 36 |
| Operating Temperature (°C) | -40 to 85 | -40 to 85 | 0 to 70 | -40 to 85 | -40 to 85 |
| Package / Case | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.173", 4.40mm) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Product Status | Last Time Buy | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Primary Recommendation: LM6172IMX/NOPB
The LM6172IMX/NOPB is the direct parametric equivalent and primary substitute for the LM6172IMX. This part maintains identical electrical performance across all specified parameters and is manufactured by the same supplier (Texas Instruments). The LM6172IMX/NOPB carries Active product status, ensuring continued availability and supply chain stability. Both parts are ROHS3 compliant with MSL 1 rating, meeting all regulatory and environmental requirements. Inventory availability for LM6172IMX/NOPB is significantly higher (41,866 units) compared to the original LM6172IMX (9,361 units), providing superior supply security. This part is suitable for direct pin-for-pin replacement in all applications currently using the LM6172IMX.
Secondary Recommendation: LT1358CS8#TRPBF
The LT1358CS8#TRPBF is recommended for applications where the LM6172IMX/NOPB is unavailable and moderate performance reduction is acceptable. This Analog Devices part maintains the extended operating temperature range (-40°C to 85°C) and supply voltage range (5V to 30V) compatibility. The slew rate of 600V/µs and gain bandwidth product of 25 MHz represent approximately 20% and 25% of the original specifications, respectively. This part is suitable for applications with bandwidth requirements below 25 MHz and slew rate requirements below 600V/µs. The LT1358CS8#TRPBF is ROHS3 compliant with MSL 1 rating and carries Active product status. Inventory availability is 3,900 units.
Tertiary Recommendation: LT1355CS8#TRPBF
The LT1355CS8#TRPBF is recommended only for low-bandwidth applications where power consumption minimization is a design priority. This part exhibits the lowest supply current (1 mA per dual channels) among all substitutes. However, the operating temperature range is restricted to 0°C to 70°C, and the supply voltage maximum is limited to 30V. The slew rate of 400V/µs and gain bandwidth product of 12 MHz represent approximately 13% and 12% of the original specifications. This part is suitable only for applications with bandwidth requirements below 12 MHz and operating temperatures within 0°C to 70°C. The LT1355CS8#TRPBF is ROHS3 compliant with MSL 1 rating and carries Active product status. Inventory availability is 50,300 units.
Not Recommended: BA3404F-E2
The BA3404F-E2 is not recommended as a substitute for the LM6172IMX in most applications. While this Rohm Semiconductor part shares the dual-channel configuration and 8-SOIC package form factor, it exhibits significantly reduced electrical performance: 1.2V/µs slew rate (0.04% of original), 1.2 MHz gain bandwidth product (1.2% of original), and 30 mA output current per channel (33% of original). The package width differs (0.173" versus 0.154"), potentially requiring PCB layout modifications. This part is suitable only for general-purpose, low-frequency applications where bandwidth is below 1.2 MHz and output current requirements do not exceed 30 mA per channel.
Frequently Asked Questions (FAQ)
Q1: Can the LM6172IMX/NOPB be used as a direct replacement for the LM6172IMX?
A: Yes. The LM6172IMX/NOPB is a parametric equivalent with identical electrical specifications, package configuration, and mounting type. No circuit modifications are required. The primary difference is product status: LM6172IMX/NOPB is Active, while LM6172IMX is Last Time Buy. Both parts are ROHS3 compliant with MSL 1 rating.
Q2: What are the key differences between the LT1358CS8#TRPBF and the LM6172IMX?
A: The LT1358CS8#TRPBF exhibits lower performance specifications: slew rate is 600V/µs (versus 3000V/µs), gain bandwidth product is 25 MHz (versus 100 MHz), and -3dB bandwidth is proportionally reduced. Input bias current is lower at 120 nA (versus 1.2 µA). Supply current is reduced to 2 mA per dual channels (versus 4.6 mA). Output current per channel is limited to 30 mA (versus 90 mA). The operating temperature range matches (-40°C to 85°C), but supply voltage maximum is limited to 30V (versus 36V).
Q3: Is the BA3404F-E2 suitable for high-speed applications?
A: No. The BA3404F-E2 is not suitable for high-speed applications. With a slew rate of only 1.2V/µs and gain bandwidth product of 1.2 MHz, this part is designed for low-frequency, general-purpose applications. The LM6172IMX, LM6172IMX/NOPB, or LT1358CS8#TRPBF are more appropriate for applications requiring higher bandwidth and slew rate performance.
Q4: Can the LT1355CS8#TRPBF be used in applications with operating temperatures below 0°C or above 70°C?
A: No. The LT1355CS8#TRPBF has a restricted operating temperature range of 0°C to 70°C. Applications requiring operation at -40°C or above 70°C must use the LM6172IMX/NOPB or LT1358CS8#TRPBF, both of which support -40°C to 85°C operation.
Q5: What is the significance of the package width difference between the BA3404F-E2 and other substitutes?
A: The BA3404F-E2 has a package width of 0.173" (4.40mm), while the LM6172IMX and other recommended substitutes have a width of 0.154" (3.90mm). This 0.019" difference may require PCB layout modifications, including potential changes to trace routing and component spacing. Pin-to-pin compatibility is maintained, but physical board layout verification is necessary before substitution.
Q6: Which substitute part offers the lowest power consumption?
A: The LT1355CS8#TRPBF offers the lowest power consumption with a supply current of 1 mA per dual channels, compared to 4.6 mA for the LM6172IMX and 2 mA for the LT1358CS8#TRPBF. However, this power reduction comes with significantly reduced bandwidth (12 MHz versus 100 MHz) and restricted operating temperature range (0°C to 70°C).
Q7: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed (LM6172IMX/NOPB, LT1355CS8#TRPBF, LT1358CS8#TRPBF, and BA3404F-E2) are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). All parts meet current environmental and regulatory requirements.
Q8: What is the maximum output current capability of each substitute?
A: The LM6172IMX and LM6172IMX/NOPB support 90 mA output current per channel. The LT1355CS8#TRPBF, LT1358CS8#TRPBF, and BA3404F-E2 all support 30 mA output current per channel. Applications requiring output currents exceeding 30 mA must use the LM6172IMX or LM6172IMX/NOPB.
Q9: Can the LT1358CS8#TRPBF operate at supply voltages above 30V?
A: No. The LT1358CS8#TRPBF has a maximum supply voltage of 30V. Applications requiring operation at supply voltages between 30V and 36V must use the LM6172IMX, LM6172IMX/NOPB, or BA3404F-E2.
Q10: What packaging options are available for the LT1358 series?
A: The LT1358 series is available in multiple packaging configurations: LT1358CS8 (standard packaging), LT1358CS8#PBF (Tube), LT1358CS8#TR (Tape & Reel), and LT1358CS8#TRPBF (Cut Tape & Digi-Reel). Selection depends on procurement volume and assembly process requirements. All variants maintain identical electrical specifications and ROHS3 compliance.
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