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Texas Instruments LMV921M7X
- Part No.:
- LMV921M7X
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LMV921M7X.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,519
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Product details
Overview
LMV921M7X from Texas Instruments is a single-channel, rail-to-rail input/output operational amplifier optimized for 1.8V operation, delivering 1 MHz gain-bandwidth product, 145 µA per amplifier supply current, and 6 mV maximum input offset voltage. It operates from +1.8V to +5.0V supplies and drives 600 Ω loads with ≤100 mV output swing from rail at 1.8V - enabling use in low-voltage portable battery monitoring circuits.
For engineers reviewing the LMV921M7X datasheet, LMV921M7X pinout, LMV921M7X application, or LMV921M7X equivalent, key selection criteria include ultra-low supply current at 1.8V, guaranteed rail-to-rail I/O performance down to 1.8V, SC70-5 package footprint constraints, and bipolar-input stage behavior affecting VOS vs. VCM crossover.
Technical Context
The LMV921M7X uses a complementary PNP/NPN bipolar input stage enabling rail-to-rail input common-mode range extending 300 mV beyond both supply rails. Its output stage delivers ±4 mA short-circuit current and sustains stable unity-gain operation with up to 1 nF capacitive load when configured with external isolation or pull-up resistors.
This device exhibits VOS crossover near 1 V below V+, causing input-stage-dependent distortion for large-swing signals crossing that region. Its 78 dB PSRR and 1.8V–5.0V operating range make it suitable for direct connection to decaying battery rails without regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.8V to +5.0V - supports direct connection to two-cell alkaline (3.0V), single-cell Li-ion (3.6V nominal), or 5V systems without LDO. |
| Gain-Bandwidth Product | 1 MHz - enables stable unity-gain buffer or low-frequency signal conditioning (e.g., sensor amplification up to ~100 kHz). |
| Supply Current per Amplifier | 145 µA typical at 1.8V - allows >6800 hours of operation on a 1000 mAh alkaline AA cell in always-on monitoring. |
| Input Offset Voltage (max) | 6 mV - sets DC accuracy limit in high-gain configurations (e.g., 100× gain yields 600 mV max error). |
| Output Swing (600 Ω load) | Within 100 mV of each rail at 1.8V - ensures full utilization of low-voltage ADC reference ranges (e.g., 1.8V VREF). |
| Input Common-Mode Range | Extends 300 mV beyond both rails - permits sensing ground-referenced or rail-referenced signals without level-shifting. |
| Operating Temperature | −40°C to +85°C junction - validated for industrial portable equipment environments. |
Pinout & Package
LMV921M7X is packaged in the ultra-small SC70-5 surface-mount package (2.0 mm × 2.1 mm × 1.0 mm). This 5-pin package supports space-constrained PCB layouts in handheld and wearable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | Delivers rail-to-rail voltage swing; capable of sourcing/sinking ≥4 mA into 600 Ω load at 1.8V. |
| 2 (−IN) | Inverting Input | Differential input node; bias current ≤50 nA (max) - requires compensation resistor if feedback network exceeds 10 kΩ. |
| 3 (V−) | Negative Supply / Ground | Reference terminal for single-supply operation; must be connected directly to low-impedance ground plane. |
| 4 (+IN) | Non-Inverting Input | Differential input node; shares same bipolar input stage as −IN; VOS varies with VCM near 1 V below V+. |
| 5 (V+) | Positive Supply | Accepts 1.8V–5.0V; PSRR = 78 dB - tolerates battery voltage decay without external regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-supply-range signal handling in single-supply systems - eliminates need for level-shifting circuitry in battery-powered sensors. |
| 1.8V minimum supply operation | Guaranteed functionality at 1.8V - supports direct interface with modern low-power microcontrollers and ADCs using 1.8V I/O domains. |
| 145 µA supply current per amplifier | Reduces system standby power - critical for multi-year battery life in remote monitoring nodes and wearables. |
| Bipolar input stage | Provides low input voltage noise (45 nV/√Hz) and predictable IB behavior - advantageous over CMOS inputs in precision DC-coupled applications. |
| Stable with 1 nF capacitive load | Allows direct driving of ADC input capacitance or long traces without external compensation - simplifies layout in compact designs. |
Applications
| Cordless/Cellular Phones | Laptops |
|---|---|
Use Scenario: Signal conditioning for microphone bias and audio line-level buffering in slim clamshell handsets. IC Role / Device Role / Timing Role: Single op-amp configured as rail-to-rail AC-coupled preamplifier and DC-biased buffer. Use Value: 145 µA quiescent current extends talk time; SC70-5 footprint saves board area in antenna-proximate RF sections. |
Use Scenario: Battery voltage monitoring and charge-state indication in ultrabook power management subsystems. IC Role / Device Role / Timing Role: Precision single-supply comparator alternative - used in resistive-divider-based voltage sensing with rail-to-rail output swing. Use Value: 6 mV VOS max ensures accurate detection across 3.0–4.2V Li-ion range; 1.8V operation avoids need for auxiliary LDO. |
| PDAs | Portable/Battery-Powered Equipment |
Use Scenario: Touch-screen controller analog front-end for stylus pressure sensing and coordinate digitization. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail instrumentation amplifier input stage (with external resistors) for differential sensor signal amplification. Use Value: 45 nV/√Hz input voltage noise preserves SNR in high-resolution touch measurement; SC70-5 enables integration near display flex connectors. |
Use Scenario: Supply current monitoring in handheld medical devices (e.g., glucose meters, pulse oximeters). IC Role / Device Role / Timing Role: Current-sense amplifier with precision shunt resistor feedback, operating from main battery rail. Use Value: Rail-to-rail input allows sensing near ground or rail; 78 dB PSRR rejects battery ripple during active measurement cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-voltage, low-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV9001IDBVR | FET-input, 1 MHz GBW, 50 µA supply current, 0.3 mV VOS max - lower power but higher VOS drift and no guaranteed 1.8V operation. | Preferred where ultra-low input bias current (<1 pA) is required (e.g., photodiode transimpedance); less suitable for precision DC-coupled battery sensing. | Select TLV9001IDBVR only when FET-input advantages outweigh loss of guaranteed 1.8V rail-to-rail I/O and bipolar noise performance. |
| OPA316IDBVR | Bipolar-input, 10 MHz GBW, 400 µA supply current, 0.15 mV VOS max - higher speed and precision, but 2× supply current and no 1.8V guarantee. | Suitable for higher-bandwidth sensor interfaces (e.g., accelerometers, gyroscopes) where 1.8V operation is not mandatory. | Choose OPA316IDBVR when bandwidth >1 MHz or VOS <1 mV is required, accepting higher power and larger solution size. |
Compared with TLV9001IDBVR and OPA316IDBVR, LMV921M7X uniquely guarantees rail-to-rail I/O and full functionality at 1.8V while maintaining bipolar noise and drive capability - making it irreplaceable in space- and voltage-constrained battery monitoring and portable audio signal paths.
Availability
LMV921M7X is available at Aetrix Electronics and suitable for cordless phones, laptop battery monitors, and portable medical devices requiring stable component supply across extended production lifecycles.
Supply support for LMV921M7X 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, power management, and signal chain solutions.
The LMV921M7X belongs to TI's LMV92x low-voltage op-amp family, designed specifically for battery-powered portable electronics requiring rail-to-rail operation at 1.8V with minimal quiescent current.
FAQ
What is the minimum supply voltage guaranteed for full specification compliance of the LMV921M7X?
The LMV921M7X is ensured to meet all electrical specifications across its operating temperature range when supplied from +1.8V to +5.0V. While functional behavior may occur down to 1.5V under light load, only the 1.8V–5.0V range is fully characterized and guaranteed per the SNOS436H datasheet. Below 1.8V, parameters such as gain, offset, and output swing are not assured.
Does the LMV921M7X support true rail-to-rail input common-mode voltage range?
Yes - the LMV921M7X input common-mode voltage range extends 300 mV beyond both supply rails (e.g., −0.3V to +2.1V at 1.8V supply), verified per the 1.8V DC Electrical Characteristics table. This enables direct sensing of ground-referenced or rail-referenced signals without external level-shifting circuitry.
Can the LMV921M7X drive a 1000 pF capacitive load stably in unity-gain configuration?
Yes - the LMV921M7X can drive up to 1000 pF capacitive load with minimal ringing in unity-gain follower configuration, as confirmed in the Applications section and Figure 52 of the SNOS436H datasheet. Stability is maintained via internal compensation; however, for loads >600 pF, adding a 10–100 Ω series isolation resistor at the output is recommended to ensure phase margin >60°.
What is the thermal resistance (θJA) of the LMV921M7X in its SC70-5 package?
The LMV921M7X in the SC70-5 package has a thermal resistance θJA of 440 °C/W, as specified in the Operating Ratings table of the SNOS436H datasheet. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with enhanced copper pour and thermal vias beneath the exposed pad (if present) - though the SC70-5 variant lacks an exposed thermal pad.
How does the input stage architecture of the LMV921M7X affect its DC accuracy in precision applications?
The LMV921M7X uses a complementary PNP/NPN bipolar input stage, resulting in a VOS crossover point approximately 1 V below V+. This causes discontinuous offset behavior across the input common-mode range - introducing distortion in large-swing signals crossing that region and degrading small-signal CMRR. For precision DC applications, biasing the input within a 0.5 V window away from the crossover point is essential to maintain accuracy.
LMV921M7X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.45V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 12 nA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 160µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 1.5 V
- Voltage - Supply Span (Max):
- 5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
LMV921M7X FAQ
1.How can I place an order for LMV921M7X through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV921M7X 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 LMV921M7X reliable?
The price and inventory of LMV921M7X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV921M7X is usually 5 days.
3.What payment methods are accepted for LMV921M7X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV921M7X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV921M7X?
LMV921M7X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV921M7X 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 LMV921M7X?
For technical support, including LMV921M7X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV921M7X requirements.
6.How does Aetrix verify that LMV921M7X is sourced from the original manufacturer or authorized distributors?
All LMV921M7X 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 LMV921M7X meets industry standards.
7.What is the process for return or replacement of LMV921M7X?
All LMV921M7X units undergo pre-shipment inspection (PSI). If there is an issue with LMV921M7X, 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 LMV921M7X part is unused and in its original packaging.
Return procedure for LMV921M7X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV921M7X Tags
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