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LM7121IMX Equivalent & Substitute Parts
Part Overview
The LM7121IMX is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design requirements and production continuity. The LM7121IMX delivers high-speed amplification with a 1300V/µs slew rate and 175 MHz gain bandwidth product, making it suitable for applications requiring fast transient response and wide bandwidth performance.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | Voltage Feedback | — |
| Number of Circuits | 1 | — |
| Slew Rate | 1300 | V/µs |
| Gain Bandwidth Product | 175 | MHz |
| -3dB Bandwidth | 235 | MHz |
| Current - Input Bias | 5.2 | µA |
| Voltage - Input Offset | 900 | µV |
| Current - Supply | 5.3 | mA |
| Current - Output / Channel | 71 | mA |
| Voltage - Supply Span (Min) | 4.5 | V |
| Voltage - Supply Span (Max) | 33 | V |
| Operating Temperature | -40 to 85 | °C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | RoHS non-compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LM7121IMX is determined by compatibility across the following critical parameters:
Package Compatibility: All substitute parts must use the 8-SOIC surface mount package with 0.154" (3.90mm) width to ensure mechanical and electrical compatibility with existing PCB layouts.
Electrical Performance Envelope: Substitute parts must operate within the supply voltage range of 4.5V to 33V and maintain voltage feedback amplifier topology. The slew rate, gain bandwidth product, and -3dB bandwidth define the frequency response characteristics required for signal fidelity.
Thermal and Environmental Specifications: Operating temperature range, input bias current, input offset voltage, and output current capability must align with application requirements. The LM7121IMX operates from -40°C to 85°C with 5.2µA input bias current and 900µV input offset voltage.
Compliance and Product Status: Active product status ensures ongoing availability and manufacturing support. RoHS3 compliance and REACH unaffected status are preferred for new designs, though the original LM7121IMX is RoHS non-compliant.
Parameter Comparison
| Parameter | LM7121IMX | LM7121IMX/NOPB | AD818ARZ | AD818ARZ-REEL | AD818ARZ-REEL7 | LT1354CS8#TRPBF | LT1354IS8#TRPBF |
|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active |
| Amplifier Type | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback |
| Number of Circuits | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Slew Rate (V/µs) | 1300 | 1300 | 500 | 500 | 500 | 400 | 400 |
| Gain Bandwidth Product (MHz) | 175 | 175 | — | — | — | 12 | 12 |
| -3dB Bandwidth (MHz) | 235 | 235 | 130 | 130 | 130 | — | — |
| Current - Input Bias (µA) | 5.2 | 5.2 | — | — | — | 0.08 | 0.08 |
| Voltage - Input Offset (µV) | 900 | 900 | — | — | — | 300 | 300 |
| Current - Supply (mA) | 5.3 | 5.3 | 7 | 7 | 7 | 1 | 1 |
| Current - Output / Channel (mA) | 71 | 71 | 50 | 50 | 50 | 30 | 30 |
| Voltage - Supply Span (Min) | 4.5 V | 4.5 V | 5 V / ±2.5 V | 5 V / ±2.5 V | 5 V / ±2.5 V | 5 V | 5 V |
| Voltage - Supply Span (Max) | 33 V | 33 V | 36 V / ±18 V | 36 V / ±18 V | 36 V / ±18 V | 30 V | 30 V |
| Operating Temperature (°C) | -40 to 85 | -40 to 85 | — | — | — | 0 to 70 | -40 to 85 |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| RoHS Status | Non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Direct Replacement (Highest Compatibility):
The LM7121IMX/NOPB is the primary direct substitute. This part maintains identical electrical specifications including 1300V/µs slew rate, 175 MHz gain bandwidth product, and 235 MHz -3dB bandwidth. The LM7121IMX/NOPB is manufactured by Texas Instruments with active product status and ROHS3 compliance, providing superior long-term availability compared to the obsolete LM7121IMX. The part is available in Cut Tape and Digi-Reel packaging formats.
Alternative Substitutes with Performance Trade-offs:
The AD818ARZ, AD818ARZ-REEL, and AD818ARZ-REEL7 from Analog Devices Inc. are functionally equivalent voltage feedback amplifiers in 8-SOIC packages. These parts operate within the required supply voltage range and maintain single-circuit topology. However, they exhibit reduced slew rate (500V/µs versus 1300V/µs) and lower -3dB bandwidth (130 MHz versus 235 MHz). These devices are suitable for applications where the lower bandwidth and slew rate specifications are acceptable. All three variants are active products with ROHS3 compliance.
Low-Bandwidth Alternative:
The LT1354 series (LT1354CS8#TRPBF and LT1354IS8#TRPBF) from Analog Devices Inc. represents a lower-performance alternative with 12 MHz gain bandwidth product and 400V/µs slew rate. The LT1354IS8#TRPBF operates across the extended temperature range (-40°C to 85°C) matching the original LM7121IMX. This device is appropriate only for applications with significantly reduced bandwidth requirements. The LT1354CS8#TRPBF operates within the commercial temperature range (0°C to 70°C).
Compliance Considerations:
All recommended substitutes except the original LM7121IMX are ROHS3 compliant and REACH unaffected, supporting regulatory requirements for new designs and manufacturing environments. The LM7121IMX/NOPB is the preferred choice for direct replacement in existing designs due to identical electrical performance and active product status.
Frequently Asked Questions (FAQ)
Q: Can the LM7121IMX/NOPB be used as a direct replacement for the LM7121IMX?
A: Yes. The LM7121IMX/NOPB is electrically and mechanically identical to the LM7121IMX. Both parts feature 1300V/µs slew rate, 175 MHz gain bandwidth product, and 8-SOIC packaging. The primary difference is product status: LM7121IMX/NOPB is active with ROHS3 compliance, while LM7121IMX is obsolete and RoHS non-compliant.
Q: What are the key performance differences between the LM7121IMX and AD818ARZ?
A: The LM7121IMX provides 1300V/µs slew rate and 235 MHz -3dB bandwidth, while the AD818ARZ delivers 500V/µs slew rate and 130 MHz -3dB bandwidth. The LM7121IMX is optimized for high-speed applications requiring fast transient response. The AD818ARZ is suitable for video amplification and moderate-bandwidth applications. Both operate within 4.5V to 33V supply range and use 8-SOIC packaging.
Q: Are all substitute parts available in the same packaging format?
A: All substitute parts use 8-SOIC surface mount packages with 0.154" (3.90mm) width, ensuring mechanical compatibility with existing PCB layouts. Packaging variants differ in tape format: LM7121IMX/NOPB is available in Cut Tape and Digi-Reel; AD818ARZ variants are available in Tube, standard Reel, and Digi-Reel formats; LT1354 variants are available in Tube and Tape & Reel formats.
Q: Which substitute part is recommended for new designs?
A: The LM7121IMX/NOPB is recommended for new designs requiring performance equivalent to the original LM7121IMX. This part is active, ROHS3 compliant, and maintains identical electrical specifications. For applications with reduced bandwidth requirements, the AD818ARZ series offers active product status and ROHS3 compliance with lower power consumption.
Q: What is the operating temperature range for each substitute?
A: LM7121IMX/NOPB operates from -40°C to 85°C. AD818ARZ variants operate within the commercial range (0°C to 70°C) unless otherwise specified. LT1354CS8#TRPBF operates from 0°C to 70°C. LT1354IS8#TRPBF operates from -40°C to 85°C, matching the extended temperature range of the original LM7121IMX.
Q: Can the LT1354 series replace the LM7121IMX in high-speed applications?
A: No. The LT1354 series is not suitable for high-speed applications. With 12 MHz gain bandwidth product and 400V/µs slew rate, the LT1354 is designed for low-bandwidth, low-power applications. The LM7121IMX/NOPB or AD818ARZ series are appropriate for high-speed requirements.
Q: What is the moisture sensitivity level for all substitute parts?
A: All substitute parts, including the original LM7121IMX, have Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements.
Q: Are all substitute parts REACH compliant?
A: Yes. All substitute parts listed are REACH unaffected, indicating compliance with REACH regulations. The original LM7121IMX is also REACH unaffected.
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