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Texas Instruments LMV321AIDBVR
- Part No.:
- LMV321AIDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV321AIDBVR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,583
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Product details
Overview
LMV321AIDBVR from Texas Instruments is a single-channel, rail-to-rail output operational amplifier optimized for low-voltage (2.5 V to 5.5 V), low-power 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 space-constrained wearable devices and smoke detectors.
For engineers reviewing the LMV321AIDBVR datasheet, LMV321AIDBVR pinout, LMV321AIDBVR application, or LMV321AIDBVR equivalent, key selection criteria include its resistive open-loop output impedance (1.2 kΩ at 1 MHz), EMI/RFI filtering, –40°C to 125°C operating range, and stable operation with ≥500 pF capacitive loads - critical for sensor front-ends and battery-powered analog interfaces.
Technical Context
The LMV321AIDBVR 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 true 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/RFI rejection filter and no internal compensation beyond the base topology. Input bias current remains ≤10 pA across –40°C to 125°C, and PSRR exceeds 78 dB from 2.5 V to 5.5 V supply range.
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 Li-ion–based systems without level-shifting. |
| Input Offset Voltage | ±1 mV (typ) - ensures ≤2 mV total error in DC-coupled sensor amplification at room temperature. |
| Unity-Gain Bandwidth | 1 MHz - supports stable gain-of-1 buffering of signals up to ~100 kHz with <0.1% gain error. |
| Quiescent Current | 70 µA per channel - allows continuous operation for >1 year on a 200 mAh coin cell in always-on motion detectors. |
| Output Swing | Within 20 mV of rails (RL = 10 kΩ) - maximizes dynamic range for 12-bit ADC interfacing with 3.3 V supplies. |
| Capacitive Load Drive | Stable with ≥500 pF - eliminates need for isolation resistors when driving long PCB traces or LCD bias networks. |
| EMI/RFI Rejection | Integrated filter - reduces susceptibility to GSM/ISM-band interference in portable medical and security sensors. |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 2.8 mm footprint, surface-mount, thermally enhanced with exposed pad (not electrically connected). Pin 1 = Output, Pin 2 = V–, Pin 3 = +IN, Pin 4 = –IN, Pin 5 = V+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Class-AB rail-to-rail driver capable of sourcing/sinking ±40 mA; connects directly to ADC input or filter network. |
| 2 (V–) | Negative supply / ground reference | Common return for single-supply operation; must be low-impedance to minimize noise coupling into input stage. |
| 3 (+IN) | Noninverting input | High-impedance node (≥1012 Ω); accepts sensor signals down to (V–) – 0.1 V without phase reversal. |
| 4 (–IN) | Inverting input | Feedback node for transimpedance or inverting gain configurations; matched to +IN for offset minimization. |
| 5 (V+) | Positive supply | Primary power rail; decoupling capacitor (0.1 µF) required within 2 mm for stable high-frequency PSRR performance. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings to within 20 mV of V+ or V– under 10 kΩ load - preserves full ADC input range in 3.3 V systems. |
| Resistive open-loop output impedance | 1.2 kΩ at 1 MHz - enables predictable stability with large capacitive loads without external series resistance. |
| Integrated RFI/EMI filter | Rejects >60 dB of 900 MHz–2.4 GHz interference - critical for reliable operation near wireless modules in wearables. |
| No phase reversal | Guaranteed under overdrive conditions - prevents latch-up or erroneous output states in transient-heavy sensor inputs. |
| Extended temperature range | –40°C to 125°C operation - qualified for HVAC control boards and automotive cabin-sensing modules. |
Applications
| Smoke Detectors | Motion Detectors |
|---|---|
|
Use Scenario: Amplifying weak ionization chamber current (pA–nA) in battery-powered residential smoke alarms. IC Role / Device Role / Timing Role: Low-noise, low-IQ transimpedance amplifier converting chamber current to measurable voltage. Use Value: 10 pA input bias and 30 nV/√Hz noise ensure detection of sub-100 fA 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: AC-coupled gain stage with rail-to-rail output driving comparator or MCU ADC. Use Value: 1 MHz bandwidth and 70 µA IQ support fast response to human motion while extending 2xAA battery life to >3 years. |
| Wearable Devices | Low-Side Current Sensing |
|
Use Scenario: Biopotential signal amplification (ECG/PPG) in compact fitness trackers with 3.3 V supply. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer with high CMRR and EMI immunity. Use Value: Integrated EMI filter and 86 dB CMRR at DC suppress RF noise from Bluetooth radios co-located on same PCB. |
Use Scenario: Amplifying shunt voltage in battery management systems for portable power tools. IC Role / Device Role / Timing Role: Precision gain block in low-side current sense configuration with 49× fixed gain. Use Value: ±1 mV VOS and 125 µA max IQ over temperature enable ±1% current measurement accuracy at 0–10 A range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV9001IDBVR | Lower 0.65 mV VOS, higher 1.5 MHz GBW, but 150 µA IQ; no integrated EMI filter. | Better DC precision and speed, but less robust in noisy environments like motor-driven appliances. | Choose TLV9001IDBVR when VOS and bandwidth outweigh EMI immunity requirements. |
| LMV321IDBVR | Legacy version: ±3 mV VOS, no EMI filter, 125 µA IQ, same pinout and package. | Cost-sensitive designs where extended temp range and EMI rejection are not required. | LMV321IDBVR is suitable for commercial-grade consumer electronics with <85°C ambient. |
Compared with TLV9001IDBVR and LMV321IDBVR, the LMV321AIDBVR uniquely balances ultra-low quiescent current (70 µA), integrated EMI filtering, and guaranteed phase-reversal immunity - making it optimal for safety-critical, battery-operated sensing where reliability trumps marginal DC specs.
Availability
LMV321AIDBVR is available at Aetrix Electronics and suitable for smoke detectors, motion detectors, wearable devices, low-side current sensing, and HVAC control requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LMV321AIDBVR 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 over 50 years of op amp innovation and broad distribution infrastructure.
The LMV3xxA family was designed specifically for low-voltage, low-power, rail-to-rail output applications in portable and safety-critical systems - emphasizing capacitive-load stability, EMI resilience, and extended temperature operation.
FAQ
What is the maximum capacitive load the LMV321AIDBVR can drive stably?
The LMV321AIDBVR is characterized for stable operation with ≥500 pF capacitive loads without external compensation. Its resistive open-loop output impedance (1.2 kΩ at 1 MHz) enables predictable phase margin retention - verified in Figure 5-21 of the datasheet - making it suitable for driving long traces, LCD bias lines, or unbuffered ADC inputs without added series resistance.
Does the LMV321AIDBVR support true rail-to-rail input?
No - the LMV321AIDBVR features rail-to-rail *output* only. Its input common-mode range extends to (V–) – 0.1 V but stops 1 V below V+, as specified in Section 5.7 (VCM = (V–) – 0.1 V to (V+) – 1 V). This design uses a P-channel input pair for negative-rail compatibility and adds an N-channel pair to prevent phase reversal, but full rail-to-rail input would require complementary input stages with tighter matching.
What is the overload recovery time of the LMV321AIDBVR?
The LMV321AIDBVR has an overload recovery time of 850 ns (0.85 µs), defined as the time required for the output to return from saturation to linear operation after overdrive. This value is confirmed in Section 6.3.4 and Figure 5-23 of the datasheet, enabling fast settling in pulse-amplification or comparator-like applications where input transients exceed the linear range.
Is the LMV321AIDBVR suitable for photodiode transimpedance applications?
Yes - the LMV321AIDBVR's 10 pA input bias current, 30 nV/√Hz input voltage noise, and unity-gain stability make it well-suited for photodiode amplification in single-supply configurations. Application note SBOS923I includes a validated 3.3 V photodiode circuit (Figure 7-3) using the dual LMV358A; the LMV321AIDBVR provides identical per-channel performance in space-constrained layouts.
How does the EMI/RFI filter in the LMV321AIDBVR improve system-level robustness?
The integrated EMI/RFI filter in the LMV321AIDBVR attenuates high-frequency interference (up to 10 GHz) before it reaches the input stage, improving electromagnetic interference rejection ratio (EMIRR) by >60 dB at 900 MHz. This is measured in Figure 5-30 and enables reliable operation in proximity to Bluetooth, Wi-Fi, or cellular radios - a key advantage over standard op amps in wearable and IoT sensor nodes.
LMV321AIDBVR 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:
- Rail-to-Rail
- Slew Rate:
- 1.7V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 80µA
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMV321AIDBVR FAQ
1.How can I place an order for LMV321AIDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV321AIDBVR 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 LMV321AIDBVR reliable?
The price and inventory of LMV321AIDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV321AIDBVR is usually 5 days.
3.What payment methods are accepted for LMV321AIDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV321AIDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV321AIDBVR?
LMV321AIDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV321AIDBVR 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 LMV321AIDBVR?
For technical support, including LMV321AIDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV321AIDBVR requirements.
6.How does Aetrix verify that LMV321AIDBVR is sourced from the original manufacturer or authorized distributors?
All LMV321AIDBVR 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 LMV321AIDBVR meets industry standards.
7.What is the process for return or replacement of LMV321AIDBVR?
All LMV321AIDBVR units undergo pre-shipment inspection (PSI). If there is an issue with LMV321AIDBVR, 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 LMV321AIDBVR part is unused and in its original packaging.
Return procedure for LMV321AIDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV321AIDBVR Tags
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