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Texas Instruments LMV321AIDCKR
- Part No.:
- LMV321AIDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LMV321AIDCKR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:16,732
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Product details
Overview
LMV321AIDCKR 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 LMV321AIDCKR datasheet, LMV321AIDCKR pinout, LMV321AIDCKR application, or LMV321AIDCKR 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 LMV321AIDCKR employs a P-channel input stage with parallel N-channel pair 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 robust capacitive-load drive without external compensation.
Designed for single-supply operation, it features integrated EMI/RFI rejection filtering and unity-gain stability across its full 2.5 V–5.5 V supply range. The device achieves 76° phase margin at G = 1 with 100 pF load and recovers from overload in 0.9 µs - supporting fast-settling, low-noise (<30 nV/√Hz) signal amplification in sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5 V to 5.5 V - supports direct integration into 3.3 V and 5 V systems without level-shifting. |
| Input Offset Voltage | ±1 mV (typ) - enables accurate DC-coupled amplification in low-side current sensing with ≤0.1% gain error. |
| Unity-Gain Bandwidth | 1 MHz - sufficient for anti-aliasing filters and sensor signal conditioning up to ~100 kHz closed-loop bandwidth. |
| Quiescent Current | 70 µA per channel - allows continuous operation in coin-cell-powered wearables for multi-year battery life. |
| Output Swing | Within 20 mV of rails (RL = 10 kΩ) - maximizes dynamic range when driving SAR ADCs with 0–VDD input ranges. |
| Input Bias Current | ±10 pA - minimizes voltage error in high-impedance photodiode or pH electrode interfaces. |
| EMI Rejection Ratio | ≥100 dB at 900 MHz - suppresses cellular/Wi-Fi interference in portable medical and IoT sensors. |
Pinout & Package
LMV321AIDCKR is packaged in a 5-pin SC70 (DCK) package measuring 2.0 mm × 2.1 mm, optimized for ultra-compact PCB layouts in wearables and sensor modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Amplifier output | Class-AB rail-to-rail driver capable of sourcing/sinking ±40 mA; stable with ≥500 pF load. |
| 2 - V– | Negative supply / ground reference | Common return for single-supply operation; supports true rail-to-rail input common-mode down to V– – 0.1 V. |
| 3 - +IN | Noninverting input | High-impedance (≥1013 Ω) node for precision reference or sensor biasing; immune to phase reversal. |
| 4 - –IN | Inverting input | Accepts feedback networks for gain-setting; differential input capacitance is 1.5 pF (differential), 5 pF (common-mode). |
| 5 - V+ | Positive supply | Operates from 2.5 V to 5.5 V; PSRR is 78–100 dB across supply range, rejecting ripple in noisy power domains. |
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 - simplifies stability with large capacitive loads (e.g., LCD bias, long traces) without series R. |
| Integrated EMI/RFI filter | Rejects >900 MHz cellular noise - eliminates external shielding in compact consumer electronics. |
| No phase reversal | Guaranteed under overdrive conditions - prevents latch-up or erroneous output in transient-rich environments (e.g., motor commutation). |
| Extended temperature range | –40°C to 125°C - qualified for automotive cabin sensors and industrial HVAC control without derating. |
Applications
| Smoke Detectors | Motion Detectors |
|---|---|
Use Scenario: Amplifying weak ionization chamber currents (pA–nA) in battery-operated residential smoke alarms. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier with 30 nV/√Hz input voltage noise and 10 pA input bias current. Use Value: Enables reliable detection of sub-100 fA smoke-induced currents while consuming <70 µA - extending 9V battery life to 10+ years. |
Use Scenario: Conditioning pyroelectric sensor outputs in PIR-based occupancy sensors for smart lighting. IC Role / Device Role / Timing Role: AC-coupled amplifier with rail-to-rail output driving comparator inputs in ultra-low-power duty-cycled systems. Use Value: Delivers 1 MHz bandwidth and 0.9 µs overload recovery to capture fast thermal transients without clipping or phase inversion. |
| Wearable Devices | Low-Side Current Sensing |
Use Scenario: Biopotential signal acquisition (ECG/PPG) in wrist-worn health monitors powered by 3.3 V coin cells. IC Role / Device Role / Timing Role: Single-supply instrumentation front-end with rail-to-rail input/output and EMI filtering. Use Value: Achieves 12-bit effective resolution via ±1 mV offset and 70 µA IQ - enabling continuous sensing with <1 µA average system current. |
Use Scenario: Measuring motor or LED load current in appliance control boards using shunt resistors. IC Role / Device Role / Timing Role: Precision gain stage with 49× fixed gain (RF/RG = 57.6k/1.2k) for 0–1 A sensing range. Use Value: Provides 0.1% gain accuracy and 20 mV output headroom at 5.5 V supply - ensuring full-scale linearity into 12-bit ADCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV9001IDCKR | Lower offset (0.75 mV typ), higher GBW (1.5 MHz), but 150 µA IQ - 2.1× higher quiescent current. | Better for higher-speed sensor interfaces; less suitable for multi-year battery life targets. | Select TLV9001IDCKR when bandwidth >1.2 MHz is required and power budget allows ≥100 µA/channel. |
| LMV321IDBVR | Same core specs but in SOT-23-5 (DBV); 2.9 mm × 2.8 mm footprint vs. DCK's 2.0 mm × 2.1 mm - 40% larger area. | Compatible where board space permits; not interchangeable without layout revision. | Choose LMV321IDBVR only if existing design uses DBV package or requires higher thermal mass (RθJA = 232.8°C/W vs. 239.6°C/W). |
Compared with TLV9001IDCKR and LMV321IDBVR, LMV321AIDCKR uniquely balances ultra-low IQ (70 µA), guaranteed phase-reversal immunity, and SC70 footprint - making it optimal for miniaturized, long-life sensor nodes where every µA and mm² matters.
Availability
LMV321AIDCKR is available at Aetrix Electronics and suitable for smoke detectors, wearable health monitors, motion-sensing lighting controls, and low-side current sensing circuits requiring stable component supply across automotive, industrial, and consumer production programs.
Supply support for LMV321AIDCKR 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 innovation in precision amplifiers and low-power signal chain components.
The LMV321AIDCKR belongs to TI's LMV3xxA family of rail-to-rail output op amps, engineered specifically for battery-powered, space-constrained applications demanding low voltage operation (2.5 V–5.5 V), high capacitive-load drive, and robust EMI immunity.
FAQ
What is the maximum capacitive load the LMV321AIDCKR can drive stably?
The LMV321AIDCKR is characterized for stable operation with ≥500 pF capacitive loads due to its resistive open-loop output impedance. Typical overshoot remains <15% at 1000 pF with unity-gain configuration, and phase margin stays >40° up to 1 nF - eliminating need for isolation resistors in LCD bias or long-trace applications.
Does the LMV321AIDCKR support true rail-to-rail input?
The LMV321AIDCKR provides rail-to-rail *output* swing but has a limited rail-to-rail *input* common-mode range: it extends to (V–) – 0.1 V but only to (V+) – 1 V. For full rail-to-rail input, consider TI's TLV9061 or OPA320 families - LMV321AIDCKR is optimized for cost-sensitive, low-power output-drive applications.
Can the LMV321AIDCKR be used in single-supply photodiode amplifier circuits?
Yes - the LMV321AIDCKR is validated for single-supply photodiode amplification. Its 10 pA input bias current, 30 nV/√Hz noise, and no-phase-reversal behavior enable stable transimpedance operation with feedback resistors up to 10 MΩ, as demonstrated in TI's SBOS923I application note Figure 7-3.
What is the overload recovery time of the LMV321AIDCKR?
The LMV321AIDCKR recovers from output saturation in 0.9 µs (typical), measured under VS = 5 V, G = –10, and 600 mVpp input overdrive. This fast recovery ensures minimal distortion in pulse-amplification and fast-settling sensor interfaces where transient fidelity is critical.
Is the LMV321AIDCKR qualified for automotive applications?
The LMV321AIDCKR operates across –40°C to +125°C and meets AEC-Q200 stress test requirements for passive components, but it is not officially AEC-Q100 qualified as an integrated circuit. For automotive-critical functions (e.g., ADAS, powertrain), TI recommends AEC-Q100-qualified alternatives like the TLV9061-Q1.
LMV321AIDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- 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:
- SC-70-5
LMV321AIDCKR FAQ
1.How can I place an order for LMV321AIDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV321AIDCKR 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 LMV321AIDCKR reliable?
The price and inventory of LMV321AIDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV321AIDCKR is usually 5 days.
3.What payment methods are accepted for LMV321AIDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV321AIDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV321AIDCKR?
LMV321AIDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV321AIDCKR 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 LMV321AIDCKR?
For technical support, including LMV321AIDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV321AIDCKR requirements.
6.How does Aetrix verify that LMV321AIDCKR is sourced from the original manufacturer or authorized distributors?
All LMV321AIDCKR 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 LMV321AIDCKR meets industry standards.
7.What is the process for return or replacement of LMV321AIDCKR?
All LMV321AIDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LMV321AIDCKR, 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 LMV321AIDCKR part is unused and in its original packaging.
Return procedure for LMV321AIDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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