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LMV321AP5X Equivalent & Substitute Parts
Part Overview
The LMV321AP5X is a voltage feedback operational amplifier manufactured by onsemi, housed in a 5-TSSOP SC-70-5 package. This single-circuit, rail-to-rail amplifier operates across a 2.7 V to 5.5 V supply range with a 1.4 MHz gain bandwidth product and 1.5 V/µs slew rate. The device is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | Voltage Feedback | — |
| Number of Circuits | 1 | — |
| Output Type | Rail-to-Rail | — |
| Slew Rate | 1.5 | V/µs |
| Gain Bandwidth Product | 1.4 | MHz |
| Current - Input Bias | 1 | nA |
| Voltage - Input Offset | 1 | mV |
| Current - Supply | 100 | µA |
| Current - Output / Channel | 34 | mA |
| Voltage - Supply Span (Min) | 2.7 | V |
| Voltage - Supply Span (Max) | 5.5 | V |
| Operating Temperature | -40 to 125 | °C |
| Package / Case | 5-TSSOP, SC-70-5, SOT-353 | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LMV321AP5X is determined by compatibility across the following critical parameters:
Package Compatibility: All substitute parts must use the 5-TSSOP, SC-70-5, or SOT-353 package to ensure mechanical and electrical fit on existing PCB layouts.
Supply Voltage Range: Substitute parts must support the 2.7 V to 5.5 V supply span. Parts with narrower ranges (such as 1.8 V minimum or 2.5 V minimum) remain compatible if the upper limit reaches 5.5 V and the application operates within the substitute's specified range.
Output Configuration: All substitutes must provide rail-to-rail output capability to maintain signal swing characteristics.
Single Circuit Requirement: Substitutes must contain exactly one amplifier circuit per package.
Electrical Performance: Gain bandwidth product, slew rate, input bias current, input offset voltage, supply current, and output current are secondary selection criteria. Substitutes with equal or superior performance in these parameters are functionally compatible, though application-specific requirements may necessitate performance verification.
Product Status and Compliance: Active product status is preferred for long-term availability. All substitutes must maintain ROHS3 compliance and REACH unaffected status to satisfy regulatory requirements.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA) | Input Offset (mV) | Supply Current (µA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LMV321AP5X | onsemi | Voltage Feedback | 1.5 | 1.4 | 1 | 1 | 100 | 34 | 2.7 | 5.5 | -40 to 125 | Obsolete |
| LMV321SQ3T2G | onsemi | General Purpose | 1 | 1 | 1 | 1.7 | 130 | 160 | 2.7 | 5.5 | -40 to 85 | Active |
| LMV321IDCKR | UMW | Voltage Feedback | — | 1 | 0.01 | 0.8 | 45 | 25 | 2.1 | 5.5 | -25 to 85 | Active |
| APX321SEG-7 | Diodes Incorporated | General Purpose | 1 | 1 | 15 | 1.7 | 110 | 90 | 2.5 | 5.5 | -40 to 85 | Active |
| AZV321KSTR-G1 | Diodes Incorporated | General Purpose | 1 | 1 | 250 | 1.7 | 130 | 160 | 2.7 | 5.5 | -40 to 85 | Active |
| LMV301MG/NOPB | Texas Instruments | General Purpose | 0.66 | 1 | 0.182 | 0.9 | 163 | 108 | 1.8 | 5 | -40 to 85 | Active |
| LMV301MGX/NOPB | Texas Instruments | General Purpose | 0.66 | 1 | 0.182 | 0.9 | 163 | 108 | 1.8 | 5 | -40 to 85 | Active |
| LMV321IDCKT | Texas Instruments | General Purpose | 1 | 1 | 15 | 1.7 | 130 | — | 2.7 | 5.5 | -40 to 125 | Active |
| LMV321LICT | STMicroelectronics | General Purpose | 0.7 | 1.3 | 27 | 1 | 130 | 70 | 2.7 | 5.5 | -40 to 125 | Active |
| LMV321M7/NOPB | Texas Instruments | General Purpose | 1 | 1 | 15 | 1.7 | 130 | 160 | 2.7 | 5.5 | -40 to 85 | Active |
| LMV321M7X/NOPB | Texas Instruments | General Purpose | 1 | 1 | 15 | 1.7 | 130 | — | 2.7 | 5.5 | -40 to 85 | Active |
Engineering Selection Recommendations
Direct Voltage Feedback Equivalent: The LMV321IDCKR (UMW) maintains the voltage feedback amplifier topology of the original LMV321AP5X. This part is active and ROHS3 compliant. The supply voltage minimum is reduced to 2.1 V, which does not restrict compatibility in applications requiring 2.7 V or higher. Operating temperature range is limited to -25°C to 85°C compared to the original -40°C to 125°C specification.
Extended Temperature Range Alternatives: For applications requiring the full -40°C to 125°C operating range, the LMV321IDCKT (Texas Instruments) and LMV321LICT (STMicroelectronics) are active alternatives. Both maintain the 2.7 V to 5.5 V supply range and SC-70-5 package. The LMV321LICT provides a gain bandwidth product of 1.3 MHz, closely matching the original 1.4 MHz specification.
General Purpose Substitutes with Full Supply Range: The LMV321SQ3T2G (onsemi), AZV321KSTR-G1 (Diodes Incorporated), LMV321M7/NOPB, and LMV321M7X/NOPB (Texas Instruments) all support the 2.7 V to 5.5 V supply range and SC-70-5 package. These parts are classified as general purpose rather than voltage feedback amplifiers. Operating temperature is limited to -40°C to 85°C.
Reduced Supply Voltage Applications: The APX321SEG-7 (Diodes Incorporated) and LMV301MG/NOPB and LMV301MGX/NOPB (Texas Instruments) support minimum supply voltages of 2.5 V and 1.8 V respectively. These parts are suitable for applications operating below 2.7 V. The LMV301 variants support a maximum supply of 5 V, which is within the 5.5 V specification of the original part.
Compliance and Availability: All listed substitutes are ROHS3 compliant and REACH unaffected. All maintain the 5-TSSOP, SC-70-5, SOT-353 package footprint. Product status is active for all substitutes, ensuring long-term availability and supply chain continuity.
Frequently Asked Questions (FAQ)
Q: Can I use a general purpose amplifier to replace the voltage feedback LMV321AP5X?
A: General purpose amplifiers such as the LMV321SQ3T2G, AZV321KSTR-G1, and LMV321M7/NOPB are functionally compatible substitutes provided the application does not require the specific voltage feedback topology. Both amplifier types are single-circuit, rail-to-rail devices in the SC-70-5 package with compatible supply voltage ranges. Verify that the application circuit design does not depend on voltage feedback-specific characteristics.
Q: What is the impact of reduced operating temperature range on substitution?
A: Substitutes with operating ranges limited to -40°C to 85°C (such as LMV321SQ3T2G, APX321SEG-7, and LMV321M7/NOPB) are suitable for applications operating within this range. Applications requiring operation above 85°C or below -40°C must use alternatives with extended temperature specifications, such as LMV321IDCKT or LMV321LICT, which support -40°C to 125°C.
Q: Are all substitutes compatible with the same PCB layout?
A: Yes. All substitute parts use the 5-TSSOP, SC-70-5, or SOT-353 package, which share identical pin configurations and footprints. No PCB layout modifications are required for mechanical compatibility.
Q: What is the significance of supply voltage minimum specifications?
A: The LMV321AP5X specifies a 2.7 V minimum supply voltage. Substitutes with lower minimums (such as LMV321IDCKR at 2.1 V or LMV301MG/NOPB at 1.8 V) are compatible with applications operating at 2.7 V or higher. Substitutes with higher minimums (such as APX321SEG-7 at 2.5 V) remain compatible if the application operates at or above the substitute's minimum specification.
Q: How do slew rate and gain bandwidth product differences affect substitution?
A: The LMV321AP5X specifies 1.5 V/µs slew rate and 1.4 MHz gain bandwidth product. Most substitutes provide 1 MHz gain bandwidth product, which is lower. Substitutes with lower slew rates (such as LMV301MG/NOPB at 0.66 V/µs) may affect circuit performance in applications sensitive to signal rise time or bandwidth. Verify application requirements before selecting a substitute with reduced performance specifications.
Q: What is the difference between cut tape and tape & reel packaging?
A: Cut tape (CT) and tape & reel (TR) packaging refer to supply formats rather than component specifications. Both formats contain identical electronic components in the same SC-70-5 package. Cut tape is suitable for small-quantity applications, while tape & reel is optimized for high-volume automated assembly. Electrical and mechanical compatibility is identical between packaging formats.
Q: Why is the LMV321AP5X classified as obsolete?
A: Obsolete status indicates that the manufacturer has discontinued production and support for this part number. Active substitutes with equivalent or superior electrical specifications and compliance certifications are available from multiple manufacturers, ensuring design continuity and supply chain reliability.
Q: Can I substitute the LMV321IDCKR if my application requires -40°C operation?
A: The LMV321IDCKR specifies an operating range of -25°C to 85°C, which does not include -40°C. Applications requiring -40°C operation must use alternatives such as LMV321IDCKT, LMV321LICT, or APX321SEG-7, which all support -40°C minimum operating temperature.
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