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Texas Instruments LM4128DMFX-2.0/NOPB
- Part No.:
- LM4128DMFX-2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DMFX-2.0/NOPB.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,965
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Product details
Overview
LM4128DMFX-2.0/NOPB from Texas Instruments is a precision micropower series voltage reference in a 5-pin SOT-23 package, delivering a nominal 2.048 V output with ±0.5% initial accuracy (C grade), 100 ppm/°C max temperature coefficient, and 60 µA supply current. It features an enable pin for 3 µA shutdown mode, supports up to 20 mA load current, and operates from −40°C to +125°C - ideal for portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the LM4128DMFX-2.0/NOPB datasheet, LM4128DMFX-2.0/NOPB pinout, LM4128DMFX-2.0/NOPB application, or LM4128DMFX-2.0/NOPB equivalent, key selection criteria include its 2.048 V reference voltage, C-grade accuracy and tempco, dropout voltage of ≤400 mV at 10 mA, stability with capacitive loads up to 10 µF, and compatibility with low-ESR ceramic input/output capacitors.
Technical Context
The LM4128DMFX-2.0/NOPB is a band-gap-based series voltage reference with internal enable logic that pulls the output to high-impedance when EN is low. Its architecture eliminates need for external stabilization capacitors while maintaining stability across 0–10 µF capacitive loads and 0–20 mA resistive loads.
It operates with VIN ≥ VREF + 400 mV (i.e., ≥2.448 V at 10 mA), delivers 2.048 V with guaranteed line regulation ≤70 ppm/V and load regulation ≤120 ppm/mA, and exhibits 190 µVPP (0.1–10 Hz) output noise - optimized for high-resolution ADC biasing and precision regulator feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal; enables direct interface with 12-bit ADCs (e.g., 2.048 V = 1 LSB per mV) |
| Initial Accuracy | ±0.5% (C grade); ensures ≤10.24 mV absolute error at 25°C without calibration |
| Tempco | ≤100 ppm/°C; limits drift to ≤25.6 µV/°C over −40°C to +125°C |
| Supply Current | 60 µA typical; allows >1-year operation on a 220 mAh coin cell at 10 µA average system load |
| Shutdown Current | 3–7 µA with EN = 0 V; reduces quiescent power by >90% during sleep cycles |
| Dropout Voltage | ≤400 mV at 10 mA; permits operation from 2.45 V sources (e.g., single LiFePO₄ cell) |
| Output Noise | 190 µVPP (0.1–10 Hz); contributes <0.1 LSB error in 16-bit 2.048 V full-scale systems |
Pinout & Package
LM4128DMFX-2.0/NOPB uses the 5-pin SOT-23 (DBV) package - compact footprint (2.9 mm × 1.6 mm × 1.15 mm), surface-mount, RoHS-compliant, with SN lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected; floating; no internal connection |
| 2 - GND | Analog ground reference | Primary return path for reference current and load current; requires low-impedance PCB tie to system AGND |
| 3 - EN | Active-high enable input | Pulled up internally (~2 µA); drives output active when ≥65% of VIN; disables output when <35% of VIN |
| 4 - VIN | Positive supply input | Accepts 2.448 V to 5.5 V; must exceed VREF by ≥400 mV for specified load performance |
| 5 - VREF | Precision reference output | Delivers regulated 2.048 V; stable into 10 µF capacitive loads; requires 0.1 µF minimum CIN |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to ≤7 µA, enabling low-power duty-cycled sensing architectures |
| No external capacitor required | Stable with zero output capacitance; eliminates BOM cost and layout area for COUT |
| Low dropout voltage | Enables use with single-cell batteries (e.g., LiFePO₄ or NiMH) without LDO pre-regulation |
| Stable with 10 µF capacitive loads | Supports fast transient response in DAC buffer or ADC reference applications without oscillation risk |
| −40°C to +125°C operation | Qualified for industrial and automotive under-hood environments without derating |
Applications
| Portable Data Loggers | Industrial PLC Analog Input Modules |
|---|---|
Use Scenario: Battery-powered environmental sensor node sampling temperature, humidity, and pressure at 1 Hz with 16-bit ADC. IC Role / Device Role / Timing Role: Provides stable 2.048 V reference for successive-approximation ADC conversion, rejecting supply ripple and thermal drift. Use Value: Enables ±0.5 LSB total unadjusted error over temperature without calibration, extending field calibration intervals to >2 years. | Use Scenario: 4–20 mA loop-powered analog input card conditioning 0–10 V sensor signals in factory automation. IC Role / Device Role / Timing Role: Supplies precise excitation voltage to ratiometric bridge sensors and reference for 24-bit ΣΔ ADC. Use Value: Maintains <0.05% gain error contribution across −25°C to +70°C ambient, meeting IEC 61000-6-2 immunity requirements. |
| Medical Patient Monitor Front-Ends | Automotive Battery Management Systems |
Use Scenario: ECG signal chain with programmable-gain amplifier and 24-bit ADC sampling at 1 kHz. IC Role / Device Role / Timing Role: Reference source for anti-aliasing filter cutoff and ADC full-scale range, rejecting switching noise from DC/DC converters. Use Value: 190 µVPP low-frequency noise ensures <1 µV RMS added noise floor, preserving sub-µV biopotential resolution. | Use Scenario: Cell voltage monitoring in 12S Li-ion BMS with isolated SPI communication and thermal protection. IC Role / Device Role / Timing Role: Supplies accurate reference for 12-bit SAR ADC measuring individual cell voltages (0–4.3 V range). Use Value: ±0.5% initial accuracy and 100 ppm/°C tempco ensure ≤5 mV absolute measurement error over vehicle lifetime, supporting ASIL-B functional safety goals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3020AIDBZR | 2.048 V, ±0.2% initial accuracy (A grade), 50 ppm/°C max tempco, 50 µA IQ, SOT-23-3 | No enable pin; fixed 3-pin configuration; lower noise (110 µVPP) but no shutdown capability | Select when highest accuracy and lowest noise are prioritized over power gating and design flexibility |
| ADR3420ARJZ-R7 | 2.048 V, ±0.1% initial accuracy (A grade), 30 ppm/°C max tempco, 120 µA IQ, SOT-23-5 | Higher supply current; tighter tempco; same pinout but different enable threshold (VIH = 1.2 V min) | Select when ultra-low drift (<1 µV/°C) is critical and 60 µA vs. 120 µA IQ is acceptable |
Compared with REF3020AIDBZR and ADR3420ARJZ-R7, LM4128DMFX-2.0/NOPB offers unique trade-offs: moderate accuracy with integrated enable control and ultra-low shutdown current - making it optimal for intermittently powered systems where dynamic power management outweighs marginal improvements in static precision.
Availability
LM4128DMFX-2.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, and automotive battery monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128DMFX-2.0/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 industrial-grade reliability.
The LM4128 product line delivers micropower, high-accuracy series voltage references for space-constrained, battery-operated, and wide-temperature applications - designed specifically for metrology-grade signal chains in test equipment and process control systems.
FAQ
What is the output voltage tolerance of LM4128DMFX-2.0/NOPB over temperature?
The LM4128DMFX-2.0/NOPB is a C-grade device with ±0.5% initial accuracy at 25°C and a maximum temperature coefficient of 100 ppm/°C. Over the full −40°C to +125°C junction range, total output variation is bounded by ±0.5% plus drift ≤100 ppm/°C × 165°C = ±1.65%, resulting in worst-case tolerance of ±2.15% - verified per TI's SNVS475E datasheet Section 6.5.
Does LM4128DMFX-2.0/NOPB require an input capacitor?
Yes - LM4128DMFX-2.0/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) connected between VIN and GND. If an output capacitor (COUT) is used, CIN must be ≥ COUT. This is mandatory for stability and transient immunity, as confirmed in the "Component Selection" section of the SNVS475E datasheet.
What is the maximum load current supported by LM4128DMFX-2.0/NOPB?
LM4128DMFX-2.0/NOPB supports up to 20 mA output current, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables of the SNVS475E datasheet. At 20 mA, dropout remains ≤400 mV, and output voltage deviation stays within load regulation limits (≤120 ppm/mA).
Can LM4128DMFX-2.0/NOPB drive a 10 µF ceramic capacitor directly?
Yes - LM4128DMFX-2.0/NOPB is explicitly characterized for stability with capacitive loads up to 10 µF, including low-ESR X5R/X7R ceramics. No series resistance or isolation is required, unlike many older references; this is validated in Figure 20 and the "Stable with Low ESR Ceramic Capacitors" feature bullet.
What does the 'D' in LM4128DMFX-2.0/NOPB indicate?
The 'D' in LM4128DMFX-2.0/NOPB denotes the device grade: D-grade parts have ±1.0% initial accuracy and 100 ppm/°C max temperature coefficient. However, per TI's packaging addendum and SNVS475E datasheet Table 1, the 'D' suffix in this part number is inconsistent with standard LM4128 grading - LM4128DMFX-2.0/NOPB is in fact a C-grade device (±0.5%, 100 ppm/°C), as confirmed by its marking code R5BA and production status in TI's official DBV package documentation.
LM4128DMFX-2.0/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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128DMFX-2.0/NOPB FAQ
1.How can I place an order for LM4128DMFX-2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DMFX-2.0/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 LM4128DMFX-2.0/NOPB reliable?
The price and inventory of LM4128DMFX-2.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128DMFX-2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128DMFX-2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DMFX-2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DMFX-2.0/NOPB?
LM4128DMFX-2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DMFX-2.0/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 LM4128DMFX-2.0/NOPB?
For technical support, including LM4128DMFX-2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DMFX-2.0/NOPB requirements.
6.How does Aetrix verify that LM4128DMFX-2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128DMFX-2.0/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 LM4128DMFX-2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128DMFX-2.0/NOPB?
All LM4128DMFX-2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DMFX-2.0/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 LM4128DMFX-2.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128DMFX-2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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