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Texas Instruments LM4128DMFX-3.3
- Part No.:
- LM4128DMFX-3.3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DMFX-3.3.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,863
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Product details
Overview
LM4128DMFX-3.3 from Texas Instruments (formerly National Semiconductor) is a precision micropower series voltage reference in SOT-23-5 package, delivering 3.3 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 voltage 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-3.3 datasheet, LM4128DMFX-3.3 pinout, LM4128DMFX-3.3 application, or LM4128DMFX-3.3 equivalent, key selection considerations include its grade-D accuracy and tempco trade-off versus power efficiency, capacitive-load stability up to 10 µF without external compensation, and compatibility with low-ESR ceramic bypassing in space-constrained designs.
Technical Context
The LM4128DMFX-3.3 employs a band-gap–derived series reference architecture with internal enable control logic and thermal compensation circuitry optimized for micropower operation. Its design eliminates need for external stabilization capacitors while maintaining stability under capacitive loads up to 10 µF and tolerating input ripple via integrated line regulation (85 ppm/V).
It operates across VIN = VREF + 400 mV to 5.5 V, supports up to 20 mA output current with short-circuit protection (75 mA limit), and achieves 310 µVPP (0.1–10 Hz) output noise-enabling use in 12-bit to 14-bit ADC reference paths where low drift and low noise are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal; fixed value, no trimming required |
| Initial Accuracy | ±1.0% at 25°C (D-grade); defines worst-case offset in calibration-sensitive circuits |
| Temperature Coefficient | 100 ppm/°C max (−40°C to +125°C); contributes ≤±330 µV/°C drift in 3.3 V output |
| Quiescent Current | 60 µA typical; enables multi-year battery life in always-on sensor nodes |
| Dropout Voltage | 400 mV max at 10 mA load; allows operation from 3.7 V Li-ion cells down to ~3.4 V before regulation loss |
| Shutdown Current | 3 µA typical (EN = 0 V); reduces system standby power by >95% vs active mode |
| Output Noise | 310 µVPP (0.1–10 Hz); supports <12-bit effective resolution in high-precision analog front-ends |
Pinout & Package
SOT-23-5 package (NS package number MF05A), surface-mount, 5-pin plastic small-outline transistor outline with exposed pad not present; footprint compatible with standard SOT-23-5 PCB land patterns.
| 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; ≥65% of VIN required for activation; internal 2 µA pull-up allows direct tie-to-VIN if always-on operation needed |
| 4 | VIN | Input supply; must exceed VREF + 400 mV (≥3.7 V for 3.3 V output) and stay ≤5.5 V |
| 5 | VREF | Precision 3.3 V output; drives ADC references, DAC bias, or comparator thresholds with minimal load regulation error (≤120 ppm/mA) |
Key Features
| Feature | Design Value |
|---|---|
| Grade-D precision | ±1.0% initial accuracy and 100 ppm/°C tempco-optimized for cost-sensitive industrial applications where moderate drift is acceptable |
| Capacitive-load stability | Stable with up to 10 µF output capacitance; eliminates need for external compensation networks in noisy environments |
| Micropower shutdown | 3 µA shutdown current via EN pin-enables duty-cycled operation in energy-harvesting or ultra-low-power IoT sensors |
| Low-noise output | 310 µVPP (0.1–10 Hz) noise floor-supports accurate DC measurements in portable test equipment and medical monitors |
| Robust input range | VIN = 3.7 V to 5.5 V ensures compatibility with single-cell Li-ion, 3.3 V LDO outputs, and regulated 5 V rails |
Applications
| Portable Data Acquisition | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Handheld multimeter sampling analog inputs at 1 kSPS using 12-bit SAR ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion, providing stable 3.3 V reference rail independent of battery voltage sag. Use Value: Enables ±0.5 LSB accuracy over full battery discharge (3.0–4.2 V), leveraging 100 ppm/°C tempco and 310 µVPP noise to maintain measurement integrity. |
Use Scenario: Field-deployable environmental sensor node logging temperature/humidity with microcontroller and analog front-end. IC Role / Device Role / Timing Role: Precision reference for analog signal conditioning and ADC reference, activated only during sampling bursts via EN pin. Use Value: Reduces average system current by >90% using 3 µA shutdown mode between readings, extending coin-cell lifetime beyond 2 years. |
| Industrial Process Monitoring | Automotive Body Control Modules |
Use Scenario: DIN-rail mounted PLC analog input module measuring 4–20 mA loop signals across −25°C to +70°C ambient. IC Role / Device Role / Timing Role: Stable 3.3 V reference for current-to-voltage conversion and ADC reference in isolated analog channel. Use Value: Maintains <±0.2% total error over temperature using D-grade spec, eliminating need for on-board calibration in cost-sensitive factory automation hardware. |
Use Scenario: Cabin climate control unit monitoring thermistor-based temperature feedback with microcontroller ADC. IC Role / Device Role / Timing Role: Grade-D reference powering ADC reference and sensor biasing circuitry in AEC-Q100–compliant design (LM4128DQ variant used). Use Value: Meets automotive-grade reliability requirements while delivering sufficient accuracy for non-safety-critical thermal sensing (±1°C tolerance). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3033AIDBZR | ±0.2% initial accuracy, 50 ppm/°C tempco, 50 µA IQ, SOT-23-3 (no EN pin) | Higher precision and lower drift, but lacks enable function and uses 3-pin package | Select when higher accuracy is required and shutdown capability is unnecessary; verify layout compatibility with 3-pin footprint |
| MAX6029AEUR+T | ±0.1% initial accuracy, 75 ppm/°C tempco, 35 µA IQ, SOT-23-3, no EN pin | Superior accuracy and lower quiescent current, but no enable control and limited to 3.3 V option only | Choose for highest-accuracy 3.3 V reference where board space permits 3-pin SOT-23 and shutdown is handled externally |
Compared with LM4128DMFX-3.3, REF3033AIDBZR offers tighter accuracy and lower drift at the cost of losing enable functionality, while MAX6029AEUR+T delivers best-in-class precision but requires external enable circuitry-making LM4128DMFX-3.3 optimal when integrated shutdown and grade-D cost/performance balance are prioritized.
Availability
LM4128DMFX-3.3 is available at Aetrix Electronics and suitable for portable instrumentation, industrial process monitoring, and battery-powered data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128DMFX-3.3 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 including the LM4128 family.
The LM4128 series was designed specifically for space-constrained, low-power applications demanding stable voltage references with integrated enable control-targeting portable test gear, sensor interfaces, and industrial control systems.
FAQ
What is the maximum input voltage for LM4128DMFX-3.3?
The LM4128DMFX-3.3 supports a maximum input voltage of 5.5 V. Operation above this level risks permanent damage per Absolute Maximum Ratings. For reliable regulation, VIN must also be ≥ VREF + 400 mV (i.e., ≥3.7 V), ensuring adequate headroom for the series reference's dropout requirement.
Does LM4128DMFX-3.3 require an input capacitor?
Yes-the LM4128DMFX-3.3 requires a minimum 0.1 µF ceramic input capacitor (X5R/X7R) for stable operation. When an output capacitor is used, CIN must be ≥ COUT. Larger values (e.g., 4.7–22 µF) further reduce output noise and startup overshoot, as confirmed in the Application Information section.
What is the output current capability of LM4128DMFX-3.3?
The LM4128DMFX-3.3 delivers up to 20 mA of continuous output current. It includes indefinite short-circuit protection limiting output current to 75 mA, preventing thermal runaway during fault conditions. Load regulation remains within 120 ppm/mA across the full 0–20 mA range.
Can LM4128DMFX-3.3 operate without an output capacitor?
Yes-LM4128DMFX-3.3 is stable with or without an output capacitor and supports capacitive loads up to 10 µF. Omitting COUT simplifies layout but degrades load transient response; adding even a small 100 nF ceramic capacitor significantly improves step-load recovery performance.
What does the 'D' in LM4128DMFX-3.3 indicate?
The 'D' denotes Grade-D performance: ±1.0% initial accuracy at 25°C and 100 ppm/°C maximum temperature coefficient over −40°C to +125°C. This grade balances cost and performance for industrial and consumer applications where extreme precision is not required.
LM4128DMFX-3.3 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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 310µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3.7V ~ 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-3.3 FAQ
1.How can I place an order for LM4128DMFX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DMFX-3.3 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-3.3 reliable?
The price and inventory of LM4128DMFX-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128DMFX-3.3 is usually 5 days.
3.What payment methods are accepted for LM4128DMFX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DMFX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DMFX-3.3?
LM4128DMFX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DMFX-3.3 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-3.3?
For technical support, including LM4128DMFX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DMFX-3.3 requirements.
6.How does Aetrix verify that LM4128DMFX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM4128DMFX-3.3 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-3.3 meets industry standards.
7.What is the process for return or replacement of LM4128DMFX-3.3?
All LM4128DMFX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DMFX-3.3, 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-3.3 part is unused and in its original packaging.
Return procedure for LM4128DMFX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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