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Texas Instruments LM4128DMFX-2.0
- Part No.:
- LM4128DMFX-2.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DMFX-2.0.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,030
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Product details
Overview
LM4128DMFX-2.0 from Texas Instruments (formerly National Semiconductor) is a precision micropower series voltage reference in SOT-23-5 package, delivering 2.048 V output with ±1.0% initial accuracy and 100 ppm/°C temperature coefficient over −40°C to +125°C. It features 60 µA quiescent current, 400 mV dropout at 10 mA load, and an enable pin supporting 3 µA shutdown mode-ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128DMFX-2.0 datasheet, LM4128DMFX-2.0 pinout, LM4128DMFX-2.0 application, or LM4128DMFX-2.0 equivalent, key selection considerations include its D-grade accuracy and tempco specification, SOT-23-5 footprint compatibility, enable-controlled power gating, low-noise 190 µVPP (0.1–10 Hz), and stable operation with up to 10 µF capacitive loads without external compensation.
Technical Context
The LM4128DMFX-2.0 implements a band-gap-derived series reference architecture with internal enable logic, allowing full shutdown via EN pin while maintaining rail-to-rail input compliance down to VREF + 400 mV. Its design eliminates need for output stabilization capacitors yet remains stable with ceramic loads up to 10 µF.
It operates across −40°C to +125°C junction temperature, supports 20 mA max output current, and delivers 190 µVPP low-frequency noise-critical for high-resolution ADC biasing and precision regulator feedback paths where long-term drift (50 ppm/1000 hrs) and thermal hysteresis (75 ppm) must be tightly controlled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal; enables precise 12-bit DAC/ADC full-scale alignment (e.g., 2.048 V = 1 LSB × 211) |
| Initial Accuracy | ±1.0% at 25°C (D grade); defines worst-case offset error before calibration in production test fixtures |
| Tempco | 100 ppm/°C max; limits output drift to ±12 mV over −40°C to +125°C ambient range |
| Quiescent Current | 60 µA typical; enables >1-year battery life in coin-cell–powered handheld meters |
| Shutdown Current | 3 µA max; reduces standby power by >95% when EN = 0 V |
| Dropout Voltage | 400 mV max at 10 mA; allows operation from 2.45 V supply in Li-ion–based systems |
| Noise (0.1–10 Hz) | 190 µVPP; contributes <0.1 LSB error in 16-bit 2.048 V full-scale measurements |
Pinout & Package
SOT-23-5 package (NS MF05A), 1.6 mm × 2.9 mm footprint, 1.1 mm height, gull-wing leads. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin; must remain unconnected and floating per datasheet |
| 2 | GND | Analog ground reference; requires low-impedance connection to system AGND plane |
| 3 | EN | Active-high enable input; driven ≥65% of VIN to activate; ≤35% to enter 3 µA shutdown |
| 4 | VIN | Input supply rail; must exceed VREF + 400 mV (≥2.45 V) for regulation at 10 mA load |
| 5 | VREF | Precision 2.048 V output; drives ADC reference inputs, op-amp feedback networks, or sensor excitation |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current from 60 µA to 3 µA-enables duty-cycled sensing in IoT edge nodes |
| Capacitor-free stability | Operates stably without output capacitor; simplifies layout and reduces BOM count in space-constrained PCBs |
| Low ESR ceramic compatibility | Accepts X5R/X7R MLCCs up to 10 µF on output-improves transient response in dynamic load applications |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault-prevents thermal runaway and enables safe use in unattended equipment |
| −40°C to +125°C operation | Validated performance across automotive under-hood and industrial control environments |
Applications
| Portable Data Loggers | Battery-Powered Multimeters |
|---|---|
Use Scenario: Continuous 16-bit ADC sampling in handheld environmental monitors powered by CR2032 cells. IC Role / Device Role / Timing Role: Provides stable 2.048 V reference for SAR ADC, enabling ±0.5 LSB linearity over temperature. Use Value: 60 µA quiescent current extends battery life beyond 18 months; 190 µVPP noise ensures sub-LSB measurement integrity. |
Use Scenario: Autoranging digital multimeter with dual-slope integration and auto-zero calibration cycles. IC Role / Device Role / Timing Role: Supplies precision reference for integrator capacitor charging and null detection comparator. Use Value: 100 ppm/°C tempco maintains <0.1% reading accuracy across 0–50°C operating range; EN pin enables power gating between measurements. |
| Industrial Sensor Transmitters | Automotive Cabin Control Modules |
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART modulation capability. IC Role / Device Role / Timing Role: Sets reference for DAC generating analog output and for internal ADC monitoring supply rail. Use Value: 400 mV dropout allows operation from 3.3 V rail with margin; long-term stability (50 ppm/1000 hrs) minimizes field recalibration frequency. |
Use Scenario: HVAC control unit in passenger compartment with ambient temperature range −40°C to +85°C. IC Role / Device Role / Timing Role: References temperature sensor signal conditioning and microcontroller ADC for cabin air mixing control. Use Value: AEC-Q100 Grade 1 qualification (LM4128DQ variants) ensures reliability; 125°C junction rating supports placement near heat sources. |
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, 50 ppm/°C, 50 µA IQ, SOT-23-3 (no EN pin) | Higher accuracy and lower tempco, but lacks enable function and uses 3-pin package | Select when higher precision is required and shutdown capability is handled externally |
| MAX6029BESA20+ | 2.048 V, ±0.2% initial accuracy, 75 ppm/°C, 35 µA IQ, SC70-5 (includes EN) | Lower quiescent current and smaller SC70-5 footprint, but rated only to +85°C ambient | Select for ultra-low-power portable designs where extended temperature range is not required |
Compared with LM4128DMFX-2.0, REF3020AIDBZR offers tighter accuracy and tempco but sacrifices enable control and requires PCB redesign for 3-pin layout; MAX6029BESA20+ reduces power and size but limits high-temperature deployment in automotive or industrial settings.
Availability
LM4128DMFX-2.0 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered test equipment, and industrial sensor transmitters requiring stable component supply with consistent D-grade specifications and SOT-23-5 packaging.
Supply support for LM4128DMFX-2.0 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 acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for legacy precision analog products like the LM4128 series.
The LM4128 product line was designed for space-constrained, battery-operated systems requiring micropower, high-accuracy voltage references with integrated enable functionality and wide temperature operation.
FAQ
What is the maximum load current supported by the LM4128DMFX-2.0?
The LM4128DMFX-2.0 supports up to 20 mA output current while maintaining regulation within specified accuracy and dropout limits. At 10 mA load, dropout is guaranteed ≤400 mV; short-circuit current is internally limited to 75 mA for fault protection. This makes LM4128DMFX-2.0 suitable for driving ADC references, op-amp bias networks, and low-current sensor excitation circuits without external buffering.
Does the LM4128DMFX-2.0 require an external output capacitor?
No, the LM4128DMFX-2.0 is designed to operate stably without an external output capacitor, eliminating a common BOM item in compact layouts. An optional output capacitor (up to 10 µF ceramic) may be added to improve load transient response-especially when switching between light and heavy loads-but it is not required for stability. Input capacitor CIN ≥ 0.1 µF is mandatory for proper operation.
What does the 'D' grade signify in LM4128DMFX-2.0?
The 'D' in LM4128DMFX-2.0 denotes the lowest accuracy grade in the LM4128 family: ±1.0% initial output voltage tolerance at 25°C and 100 ppm/°C maximum temperature coefficient over −40°C to +125°C. This grade targets cost-sensitive applications where moderate precision suffices-such as non-critical sensor interfaces or consumer-grade test tools-while retaining the same micropower, enable, and thermal performance as higher grades.
Can the LM4128DMFX-2.0 be used in automotive applications?
Yes-LM4128DMFX-2.0 itself is not automotive-qualified, but its automotive-grade counterpart LM4128DQ1MFX2.0 is AEC-Q100 Grade 1 qualified and manufactured on an automotive production flow. For non-safety-critical cabin modules or infotainment subsystems operating within −40°C to +125°C junction range, the standard LM4128DMFX-2.0 may be deployed with appropriate system-level validation; however, certified designs require the Q-suffix variant.
How does the enable pin (EN) function on the LM4128DMFX-2.0?
The EN pin on LM4128DMFX-2.0 is an active-high digital control input. When pulled ≥65% of VIN, the device operates normally with 60 µA supply current. When held ≤35% of VIN (e.g., grounded), it enters shutdown mode drawing ≤7 µA. The pin has an internal ~2 µA pull-up, so it may be left floating to default-enable or tied directly to VIN for always-on operation-no external pull-up resistor is needed.
LM4128DMFX-2.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LM4128DMFX-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DMFX-2.0 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 reliable?
The price and inventory of LM4128DMFX-2.0 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 is usually 5 days.
3.What payment methods are accepted for LM4128DMFX-2.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DMFX-2.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DMFX-2.0?
LM4128DMFX-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DMFX-2.0 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?
For technical support, including LM4128DMFX-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DMFX-2.0 requirements.
6.How does Aetrix verify that LM4128DMFX-2.0 is sourced from the original manufacturer or authorized distributors?
All LM4128DMFX-2.0 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 meets industry standards.
7.What is the process for return or replacement of LM4128DMFX-2.0?
All LM4128DMFX-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DMFX-2.0, 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 part is unused and in its original packaging.
Return procedure for LM4128DMFX-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128DMFX-2.0 Tags
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