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Texas Instruments LM4128DQ1MFX2.0/NOPB
- Part No.:
- LM4128DQ1MFX2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DQ1MFX2.0/NOPB.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,421
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Product details
Overview
LM4128DQ1MFX2.0/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 2.048 V output with ±1.0% initial accuracy (Grade D), 100 ppm/°C max temperature coefficient, and 60 µA supply current. It features an enable pin for 3–7 µA shutdown mode and supports up to 20 mA load current - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128DQ1MFX2.0/NOPB datasheet, LM4128DQ1MFX2.0/NOPB pinout, LM4128DQ1MFX2.0/NOPB application, or LM4128DQ1MFX2.0/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), stability with capacitive loads up to 10 µF, low 0.1–10 Hz noise (190 µVPP), and AEC-Q100 Grade 1 qualification for automotive use.
Technical Context
The LM4128DQ1MFX2.0/NOPB uses a band-gap-derived reference core optimized for micropower operation and low thermal hysteresis (75 ppm). Its enable-controlled architecture allows seamless transition between active (60 µA) and shutdown (3–7 µA) states without external circuitry.
Designed as a series reference, it eliminates need for external stabilization capacitors while maintaining stability with COUT ≤10 µF and requires only CIN ≥0.1 µF. Input voltage range is VREF + 400 mV to 5.5 V, supporting operation from single Li-ion cells and low-dropout regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal; enables precise 12-bit ADC full-scale alignment without trimming |
| Initial Accuracy | ±1.0% (Grade D); ensures <±20.5 mV absolute error at 25°C for cost-sensitive industrial sensing |
| Tempco | 100 ppm/°C max; limits drift to <±25 mV over −40°C to +125°C junction range |
| Supply Current | 60 µA typical; supports >1-year battery life in 10 µA-average IoT sensor nodes |
| Dropout Voltage | 400 mV max at 10 mA; allows operation from 2.45 V supply (e.g., coin cell + LDO) |
| Shutdown Current | 3–7 µA; reduces quiescent power by >90% during sleep cycles in portable equipment |
| Noise (0.1–10 Hz) | 190 µVPP; contributes <0.02 LSB error in 16-bit 2.048 V full-scale measurements |
Pinout & Package
LM4128DQ1MFX2.0/NOPB is housed in a RoHS-compliant 5-pin SOT-23 (DBV) package, 2.9 mm × 1.6 mm × 1.15 mm, with gull-wing leads and SN (matte tin) finish. MSL Level-1 rating supports unlimited floor life at ≤30°C/60% RH.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected and floating; no internal connection or function |
| 2 - GND | Analog ground reference | Primary return path for reference core and enable logic; requires low-impedance PCB plane |
| 3 - EN | Enable control input | Active-high; VIH ≥65% VIN, VIL ≤35% VIN; drives internal pass element on/off |
| 4 - VIN | Input supply rail | Accepts 2.45 V to 5.5 V; must exceed VREF by ≥400 mV for regulation |
| 5 - VREF | Precision output terminal | Delivers stable 2.048 V; capable of sourcing up to 20 mA with <120 ppm/mA load regulation |
Key Features
| Feature | Design Value |
|---|---|
| Grade D AEC-Q100 qualification | Validated for automotive Grade 1 (−40°C to +125°C) operation with production flow traceability |
| Capacitor-free stability | Operates stably without COUT; optional output cap improves transient response but not required |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault; recovers automatically when fault clears |
| Low ESR ceramic compatibility | Stable with X5R/X7R MLCCs; avoids instability risks associated with high-ESR tantalum or electrolytic caps |
| Thermal hysteresis | 75 ppm max; minimizes calibration drift after thermal cycling in field-deployed test equipment |
Applications
| Portable Data Loggers | Automotive Cabin Sensors |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring node logging temperature, humidity, and pressure at 10-second intervals. IC Role / Device Role / Timing Role: Provides stable 2.048 V reference for 16-bit SAR ADC, enabling ±0.01% measurement repeatability across temperature. Use Value: 60 µA quiescent current extends CR2032 battery life beyond 2 years; 400 mV dropout allows direct connection to buck-boost regulator output. |
Use Scenario: Occupant detection system using capacitive sensing and microcontroller-based signal conditioning in vehicle seats. IC Role / Device Role / Timing Role: Supplies precision reference for analog front-end amplifiers and ADCs processing seat occupancy signals. Use Value: AEC-Q100 Grade 1 qualification ensures reliability under automotive thermal cycling; 100 ppm/°C tempco maintains <±0.5°C equivalent error in cabin temperature compensation. |
| Industrial Process Transmitters | Medical Patient Monitoring |
|
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART digital overlay in factory automation. IC Role / Device Role / Timing Role: Reference source for DAC generating loop current setpoint and for internal diagnostics ADC. Use Value: Enables 12-bit effective resolution over 4–20 mA span; ±1.0% initial accuracy meets IEC 61298-2 Class 0.5 requirements without calibration. |
Use Scenario: Portable ECG device acquiring biopotential signals with 24-bit delta-sigma ADC and real-time filtering. IC Role / Device Role / Timing Role: Low-noise (190 µVPP) reference for ADC reference input and analog gain stage biasing. Use Value: 0.1–10 Hz noise performance directly limits baseline wander rejection; 20 mA output supports driving anti-aliasing filter op-amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3020AIDBZR | 2.048 V, ±0.2% initial accuracy (Grade A), 50 ppm/°C, 50 µA IQ, SOT-23-5 | Higher accuracy and lower tempco; lacks enable pin and automotive qualification | Select for lab-grade test equipment where shutdown control is unnecessary and tighter tolerance justifies cost premium |
| MAX6029AEUR+T | 2.048 V, ±0.1% initial accuracy, 30 ppm/°C, 110 µA IQ, SOT-23-5, no enable | Superior stability and noise (120 µVPP), but higher supply current and no shutdown mode | Prefer for high-resolution medical imaging front-ends requiring lowest possible drift, where power budget permits |
Compared with LM4128DQ1MFX2.0/NOPB, REF3020AIDBZR offers better accuracy but no enable functionality, while MAX6029AEUR+T delivers superior long-term stability at the expense of 83% higher quiescent current and no automotive qualification - making LM4128DQ1MFX2.0/NOPB optimal for cost-constrained, battery-aware automotive and industrial designs requiring guaranteed Grade 1 operation.
Availability
LM4128DQ1MFX2.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin sensors, and industrial process transmitters requiring stable component supply with AEC-Q100 compliance and extended temperature support.
Supply support for LM4128DQ1MFX2.0/NOPB 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 specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision analog ICs and automotive-grade components.
The LM4128 series was designed specifically for space-constrained, micropower applications demanding high accuracy, low dropout, and robust operation across automotive and industrial temperature ranges - targeting battery-powered test gear, sensor signal chains, and safety-critical subsystems.
FAQ
What is the maximum load current supported by the LM4128DQ1MFX2.0/NOPB?
The LM4128DQ1MFX2.0/NOPB supports up to 20 mA output current while maintaining specified load regulation (≤120 ppm/mA). This capability allows direct driving of op-amp bias networks, ADC reference inputs, and small-signal DACs without external buffering. Exceeding 20 mA may cause output voltage deviation beyond datasheet limits and trigger internal current limiting.
Does the LM4128DQ1MFX2.0/NOPB require an external output capacitor?
No, the LM4128DQ1MFX2.0/NOPB is internally compensated and stable without an output capacitor. An optional COUT (up to 10 µF) improves load transient response but is not required for stability. The mandatory CIN (≥0.1 µF ceramic) must be placed close to the VIN and GND pins to ensure proper startup and noise immunity.
What does the 'DQ' suffix indicate in LM4128DQ1MFX2.0/NOPB?
The 'DQ' denotes Grade D (±1.0% initial accuracy) and AEC-Q100 Grade 1 qualification. '1MF' specifies the SOT-23-5 (DBV) package, 'X2.0' indicates the 2.048 V output voltage, and '/NOPB' confirms lead-free (RoHS-compliant) matte tin finish. This full ordering code uniquely identifies the automotive-qualified, 2.048 V, Grade D variant.
How does the enable pin (EN) function on the LM4128DQ1MFX2.0/NOPB?
The EN pin is active-high: applying ≥65% of VIN enables the reference output (VREF), while ≤35% of VIN places LM4128DQ1MFX2.0/NOPB in shutdown mode drawing only 3–7 µA. The internal pull-up (~2 µA) allows direct connection to VIN for always-on operation. Driving EN externally enables synchronized power gating in multi-rail systems.
Is the LM4128DQ1MFX2.0/NOPB compatible with ceramic capacitors having low ESR?
Yes, the LM4128DQ1MFX2.0/NOPB is explicitly characterized and guaranteed stable with low-ESR ceramic capacitors (X5R/X7R types). Using such capacitors on VIN and optionally on VREF minimizes high-frequency noise coupling and improves transient response. High-ESR capacitors (e.g., aluminum electrolytic) are not recommended and may compromise stability.
LM4128DQ1MFX2.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 190µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.448V ~ 5.5V
- Current - Supply:
- 100µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128DQ1MFX2.0/NOPB FAQ
1.How can I place an order for LM4128DQ1MFX2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DQ1MFX2.0/NOPB 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 LM4128DQ1MFX2.0/NOPB reliable?
The price and inventory of LM4128DQ1MFX2.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128DQ1MFX2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128DQ1MFX2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DQ1MFX2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DQ1MFX2.0/NOPB?
LM4128DQ1MFX2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DQ1MFX2.0/NOPB 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 LM4128DQ1MFX2.0/NOPB?
For technical support, including LM4128DQ1MFX2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DQ1MFX2.0/NOPB requirements.
6.How does Aetrix verify that LM4128DQ1MFX2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128DQ1MFX2.0/NOPB 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 LM4128DQ1MFX2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128DQ1MFX2.0/NOPB?
All LM4128DQ1MFX2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DQ1MFX2.0/NOPB, 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 LM4128DQ1MFX2.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128DQ1MFX2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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