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Texas Instruments LMV321AUIDBVR
- Part No.:
- LMV321AUIDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV321AUIDBVR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:102,119
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Product details
Overview
LMV321AUIDBVR from Texas Instruments is a single-channel, rail-to-rail output operational amplifier optimized for low-voltage (2.5 V to 5.5 V) portable and space-constrained applications. It delivers ±1 mV input offset voltage, 1 MHz unity-gain bandwidth, 70 µA quiescent current per channel, and rail-to-rail output swing within 20 mV of supply rails under 10 kΩ load - enabling precision signal conditioning in smoke detectors, wearable devices, and low-side current sensing circuits.
For engineers reviewing the LMV321AUIDBVR datasheet, LMV321AUIDBVR pinout, LMV321AUIDBVR application, or LMV321AUIDBVR equivalent, key selection criteria include its resistive open-loop output impedance (1200 Ω at 1 MHz), EMI/RFI filtering, –40°C to 125°C operating range, and stable operation with ≥500 pF capacitive loads - critical for robust sensor front-ends and battery-powered systems.
Technical Context
The LMV321AUIDBVR employs a P-channel/N-channel parallel input stage to extend common-mode range to (V–) – 0.1 V while eliminating phase reversal during overdrive. Its class-AB output stage enables rail-to-rail swing and supports stable closed-loop operation with high capacitive loads due to resistive open-loop output impedance.
It operates as a unity-gain stable, single-supply op amp with integrated EMI rejection filter and no external compensation required. Input bias current is 10 pA (typ), common-mode rejection ratio reaches 95 dB at 5.5 V, and overload recovery time is 0.9 µs - confirming suitability for fast, low-noise, single-ended analog signal paths in safety-critical sensing nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5 V to 5.5 V - enables direct integration into 3.3 V and 5 V systems without level-shifting or LDO overhead |
| Input Offset Voltage | ±1 mV (typ) - ensures ≤100 µV error in 100 mV shunt voltage sensing at room temperature |
| Unity-Gain Bandwidth | 1 MHz - supports stable amplification of signals up to ~100 kHz in G = +1 configuration with margin |
| Quiescent Current | 70 µA per channel - allows continuous operation for >1 year on a 200 mAh coin cell in always-on wearables |
| Output Swing | Within 20 mV of rails (RL = 10 kΩ) - maximizes dynamic range for 12-bit ADC interfacing with 3.3 V supply |
| Input Bias Current | 10 pA (typ) - minimizes voltage error across high-impedance photodiode or thermistor networks |
| EMI Rejection Ratio | ≥100 dB at 900 MHz - suppresses cellular/GSM noise in handheld consumer electronics |
Pinout & Package
LMV321AUIDBVR is packaged in a 5-pin SOT-23 (DBV) footprint measuring 2.9 mm × 2.8 mm, optimized for high-density PCB layouts in compact end equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply | Highest potential rail; must be decoupled with ≥0.1 µF ceramic capacitor near pin |
| V– | Negative supply / ground | Lowest potential rail; serves as reference for single-supply operation (e.g., 0 V in 3.3 V system) |
| +IN | Noninverting input | Accepts input common-mode voltages from (V–) – 0.1 V to (V+) – 1 V - supports true single-supply sensor biasing |
| –IN | Inverting input | Differential node for feedback networks; matched layout critical for offset minimization |
| OUT | Amplifier output | Rail-to-rail capable; drives 10 kΩ loads directly; stable with ≥500 pF capacitive load without isolation resistor |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings to within 20 mV of V+ and V– under 10 kΩ load - preserves full ADC input range in low-voltage systems |
| Resistive open-loop output impedance | 1200 Ω at 1 MHz - enables stable closed-loop performance with high capacitive loads (≥500 pF) without series isolation |
| Integrated RFI/EMI filter | Rejects >100 dB of 900 MHz interference - eliminates external ferrite beads in EMI-sensitive portable designs |
| No phase reversal | Guaranteed under overdrive conditions - prevents latch-up or erroneous output states in transient-rich sensor inputs |
| Extended temperature range | –40°C to 125°C operation - qualified for automotive cabin modules and industrial HVAC control units |
Applications
| Smoke Detectors | Motion Detectors |
|---|---|
Use Scenario: Amplifying weak ionization chamber current (pA–nA range) in battery-powered residential smoke alarms. IC Role / Device Role / Timing Role: Transimpedance amplifier converting chamber current to measurable voltage for MCU ADC sampling. Use Value: 10 pA input bias current and 30 nV/√Hz noise floor enable reliable detection of sub-nA smoke-induced currents without false alarms. | Use Scenario: Conditioning pyroelectric sensor output in PIR-based occupancy sensors for smart lighting. IC Role / Device Role / Timing Role: DC-coupled amplifier with high CMRR (95 dB) rejecting 50/60 Hz mains coupling in wall-mounted units. Use Value: Rail-to-rail output and 1 MHz bandwidth support fast response to human motion while maintaining low 70 µA supply current. |
| Wearable Devices | Low-Side Current Sensing |
Use Scenario: Biopotential signal acquisition (ECG/PPG) in ultra-low-power fitness trackers using coin-cell batteries. IC Role / Device Role / Timing Role: First-stage gain and buffering for dry-electrode sensor interfaces operating from 3.3 V supply. Use Value: 70 µA quiescent current extends battery life beyond 12 months; EMI filtering suppresses RF interference from Bluetooth radios. | Use Scenario: Measuring motor or load current via shunt resistor in 24 V industrial controllers or e-bike battery management. IC Role / Device Role / Timing Role: Precision difference amplifier with gain = 49 V/V for 100 mΩ shunt, referenced to system ground. Use Value: ±1 mV offset and 125 µA max IQ over temperature ensure <1% current measurement error across –40°C to 125°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV321IDBVR | Same electrical specs but rated for –40°C to 105°C (vs. –40°C to 125°C for LMV321AUIDBVR) | Not qualified for under-hood automotive or high-temp industrial enclosures | Select LMV321AUIDBVR when extended junction temperature operation is required |
| TLV9001IDBVR | Lower 0.3 mV offset, higher 1.5 MHz GBW, but 150 µA IQ (vs. 70 µA for LMV321AUIDBVR) | Better precision and speed, but reduces battery life in always-on wearables by >2× | Choose TLV9001IDBVR only if offset or bandwidth demands outweigh power budget constraints |
Compared with LMV321IDBVR, LMV321AUIDBVR offers guaranteed 125°C operation for harsh environments; compared with TLV9001IDBVR, it provides 53% lower quiescent current - making it optimal for energy-constrained, wide-temperature industrial and consumer sensing nodes where µA-level power is non-negotiable.
Availability
LMV321AUIDBVR is available at Aetrix Electronics and suitable for smoke detectors, wearable devices, motion detectors, low-side current sensing, and HVAC control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMV321AUIDBVR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions with deep expertise in precision amplifiers, power management, and signal chain technologies.
The LMV321AUIDBVR belongs to TI's LMV3xxA low-voltage rail-to-rail output op amp family, engineered specifically for battery-powered, space-constrained applications demanding low IQ, robust capacitive-load drive, and extended temperature reliability - not general-purpose replacement.
FAQ
What is the maximum capacitive load the LMV321AUIDBVR can drive without instability?
The LMV321AUIDBVR is characterized for stable operation with ≥500 pF capacitive loads due to its resistive open-loop output impedance. Test data (Figure 5-19/5-20) confirms <5% overshoot and ≥60° phase margin at 1000 pF, enabling direct connection to ADC input capacitors or long PCB traces without isolation resistors - a key advantage over conventional op amps requiring external compensation.
Does the LMV321AUIDBVR support true single-supply operation with input signals extending to the negative rail?
Yes. The LMV321AUIDBVR features a P-channel input stage allowing common-mode input voltage down to (V–) – 0.1 V. When V– is grounded (0 V), this enables input signals from 0 V to (V+) – 1 V - supporting direct interface with ground-referenced sensors like thermistors or bridge transducers without level-shifting circuitry.
What is the overload recovery time specification for the LMV321AUIDBVR?
The LMV321AUIDBVR has a specified overload recovery time of 0.9 µs (typ) at VS = 5 V, defined as the time required to return from saturation to linear operation. This fast recovery - enabled by internal charge-handling design - ensures minimal distortion in pulse-width modulated (PWM) current sensing or fast transient event capture in motor control feedback loops.
How does the EMI/RFI filtering in the LMV321AUIDBVR improve system-level robustness?
The LMV321AUIDBVR integrates an on-die RFI/EMI rejection filter that achieves ≥100 dB attenuation at 900 MHz (Figure 5-30). This eliminates the need for external LC filters or ferrite beads in applications exposed to cellular, Wi-Fi, or Bluetooth emissions - reducing BOM count, PCB area, and susceptibility to radiated interference in portable medical and consumer electronics.
Is the LMV321AUIDBVR pin-compatible with legacy LMV321 variants?
Yes. The LMV321AUIDBVR uses the standard 5-pin SOT-23 (DBV) package with identical pinout to LMV321IDBVR and LMV321MDBVR. Pin-for-pin compatibility enables drop-in replacement in existing designs, provided the extended –40°C to 125°C temperature rating meets system requirements - no PCB or schematic changes are needed.
LMV321AUIDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1.7V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 70µA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMV321AUIDBVR FAQ
1.How can I place an order for LMV321AUIDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV321AUIDBVR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LMV321AUIDBVR reliable?
The price and inventory of LMV321AUIDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV321AUIDBVR is usually 5 days.
3.What payment methods are accepted for LMV321AUIDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV321AUIDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV321AUIDBVR?
LMV321AUIDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV321AUIDBVR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LMV321AUIDBVR?
For technical support, including LMV321AUIDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV321AUIDBVR requirements.
6.How does Aetrix verify that LMV321AUIDBVR is sourced from the original manufacturer or authorized distributors?
All LMV321AUIDBVR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMV321AUIDBVR meets industry standards.
7.What is the process for return or replacement of LMV321AUIDBVR?
All LMV321AUIDBVR units undergo pre-shipment inspection (PSI). If there is an issue with LMV321AUIDBVR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LMV321AUIDBVR part is unused and in its original packaging.
Return procedure for LMV321AUIDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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