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Texas Instruments LM4128DQ1MFX3.3/NOPB
- Part No.:
- LM4128DQ1MFX3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DQ1MFX3.3/NOPB.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,489
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Product details
Overview
LM4128DQ1MFX3.3/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 3.3 V output with ±1.0% initial accuracy, 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, and operates from −40°C to +125°C - ideal for battery-powered instrumentation and automotive sensor signal conditioning.
For engineers reviewing the LM4128DQ1MFX3.3/NOPB datasheet, LM4128DQ1MFX3.3/NOPB pinout, LM4128DQ1MFX3.3/NOPB application, or LM4128DQ1MFX3.3/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), line regulation (85 ppm/V), load regulation (25–120 ppm/mA), and stability with capacitive loads up to 10 µF without external compensation.
Technical Context
The LM4128DQ1MFX3.3/NOPB is a band-gap-based series voltage reference optimized for low-power, high-accuracy applications. Its internal architecture eliminates need for external stabilization capacitors while maintaining stability with output capacitance up to 10 µF and enabling operation with low-ESR ceramic capacitors only.
It integrates an enable input (EN) referenced to VIN, with VIH ≥65% VIN and VIL ≤35% VIN, allowing direct microcontroller GPIO control. The device achieves 75–100 ppm/°C tempco depending on grade (D-grade = 100 ppm/°C), and exhibits 310 µVPP integrated noise (0.1–10 Hz) at 3.3 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±1.0% initial accuracy (D-grade) - ensures stable ADC reference or DAC bias within 33 mV tolerance at room temperature. |
| Temperature Coefficient | 100 ppm/°C max over −40°C to +125°C - contributes ≤±33 mV drift across full operating range. |
| Supply Current | 60 µA typical, ≤100 µA max - enables multi-year battery life in always-on sensor nodes drawing <100 µA quiescent current. |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces system standby power by >90% vs active mode. |
| Dropout Voltage | 175–400 mV at 10 mA load - allows operation from 3.475 V input, compatible with single-cell LiFePO₄ or regulated 3.6 V rails. |
| Load Regulation | 25–120 ppm/mA - maintains output stability under dynamic load changes typical in multiplexed data acquisition systems. |
| Line Regulation | 85 ppm/V over VREF + 400 mV to 5.5 V - rejects ripple and variation in upstream LDO or DC-DC converter outputs. |
Pinout & Package
LM4128DQ1MFX3.3/NOPB uses the 5-pin SOT-23 (DBV) package per JEDEC MO-178AB, with 0.95 mm pitch and 2.9 mm × 1.6 mm footprint. Pin 1 is N/C (no connect); pins are arranged top-view as: Pin 1 (N/C), Pin 2 (GND), Pin 3 (EN), Pin 4 (VIN), Pin 5 (VREF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must remain unconnected and floating; no PCB trace or pad connection required. |
| Pin 2 (GND) | Analog ground reference | Primary return path for reference output and internal bias; requires low-impedance connection to clean analog ground plane. |
| Pin 3 (EN) | Enable control input | Active-high logic input; pulls up internally (~2 µA); drives into shutdown when pulled ≤35% VIN. |
| Pin 4 (VIN) | Input supply rail | Accepts 3.7 V to 5.5 V; must exceed VREF + 400 mV for regulation; bypassed with ≥0.1 µF ceramic capacitor. |
| Pin 5 (VREF) | Precision reference output | 3.3 V source capable of sourcing up to 20 mA; stable with 0–10 µF capacitive loads; low-noise node requiring short, shielded routing. |
Key Features
| Feature | Design Value |
|---|---|
| Grade-D precision | Guaranteed ±1.0% initial accuracy and 100 ppm/°C tempco - balances cost and performance for industrial-grade sensing. |
| Capacitor-free stability | Stable with no output capacitor and up to 10 µF load - eliminates BOM count and layout sensitivity in space-constrained designs. |
| Ultra-low quiescent current | 60 µA supply current - enables use in energy-harvesting systems where average current budget is sub-100 µA. |
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to +125°C TJ) - qualified for engine bay and ADAS sensor modules requiring extended temperature reliability. |
| Short-circuit protection | Indefinite 75 mA output current limit - prevents damage during test fixture miswiring or transient fault conditions. |
Applications
| Portable Data Loggers | Automotive Cabin Sensors |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring unit sampling temperature, humidity, and pressure every 10 seconds using a 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 3.3 V reference for ADC conversion, ensuring <±1 LSB error over temperature and battery discharge. Use Value: Enables 16-bit accuracy without recalibration; 60 µA supply current extends 2000 mAh Li-ion battery life to >2 years in sleep-dominated operation. |
Use Scenario: Occupant detection system using MEMS accelerometers and IR sensors inside vehicle cabin. IC Role / Device Role / Timing Role: Supplies precision bias voltage to analog front-end amplifiers and ADC drivers in AEC-Q100-compliant module. Use Value: 100 ppm/°C tempco and −40°C to +125°C operation maintain sensor offset stability across cabin thermal cycles. |
| Industrial PLC Analog Inputs | Medical Patient Monitoring |
|
Use Scenario: Modular I/O card acquiring 4–20 mA loop signals via precision shunt resistors and 24-bit ΣΔ ADCs. IC Role / Device Role / Timing Role: Reference source for both shunt voltage measurement and ADC full-scale calibration. Use Value: Load regulation ≤120 ppm/mA ensures consistent gain accuracy despite varying channel count and sampling rate. |
Use Scenario: Portable ECG monitor with low-noise instrumentation amplifier and 12-bit ADC sampling at 1 kHz. IC Role / Device Role / Timing Role: Low-noise (310 µVPP, 0.1–10 Hz) 3.3 V reference for analog signal chain biasing and ADC reference. Use Value: Output noise directly limits achievable SNR; 310 µVPP corresponds to ~13.5-bit effective resolution in 12-bit system. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AUT33+T | 0.06% initial accuracy, 3 ppm/°C tempco, 75 µA supply current, SOT-23-5 | Higher precision and lower drift, but higher cost and current - suited for metrology-grade systems. | Select MAX6126AUT33+T when long-term stability (<15 ppm/1000 hrs) and ultra-low tempco are mandatory. |
| ADR3433ARJZ-R7 | 0.1% initial accuracy, 10 ppm/°C tempco, 120 µA supply current, SOT-23-5 | Better tempco and accuracy than LM4128DQ1MFX3.3/NOPB, but doubles supply current and costs ~2.5× more. | Choose ADR3433ARJZ-R7 for medical or test equipment where 10 ppm/°C drift is required and power budget allows. |
Compared with LM4128DQ1MFX3.3/NOPB, MAX6126AUT33+T offers superior accuracy and thermal stability at higher cost and current, while ADR3433ARJZ-R7 delivers tighter tempco at double the quiescent draw - making LM4128DQ1MFX3.3/NOPB optimal for cost-sensitive, battery-operated industrial sensors needing Grade-D performance.
Availability
LM4128DQ1MFX3.3/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin sensors, and industrial PLC analog inputs requiring stable component supply with automotive-grade reliability and long-lifecycle support.
Supply support for LM4128DQ1MFX3.3/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 company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and consumer markets.
The LM4128 family is part of TI's precision voltage reference product line, engineered for low-power, high-accuracy applications including data acquisition, sensor signal conditioning, and battery-powered instrumentation where size, stability, and efficiency are critical.
FAQ
What is the maximum input voltage for LM4128DQ1MFX3.3/NOPB?
The absolute maximum input voltage for LM4128DQ1MFX3.3/NOPB is 6 V, but the recommended operating maximum is 5.5 V. Operation above 5.5 V risks exceeding absolute maximum ratings and may cause permanent damage. For reliable regulation, VIN must be ≥3.7 V (VREF + 400 mV) and ≤5.5 V per the Electrical Characteristics table in the SNVS475E datasheet.
Does LM4128DQ1MFX3.3/NOPB require an input capacitor?
Yes, LM4128DQ1MFX3.3/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) connected between VIN and GND. This capacitor is mandatory for stability and noise suppression. If an output capacitor (COUT) is used, CIN must be ≥ COUT. Larger values (e.g., 4.7–22 µF) further reduce startup overshoot and supply noise coupling.
What is the function of Pin 1 (N/C) on LM4128DQ1MFX3.3/NOPB?
Pin 1 on LM4128DQ1MFX3.3/NOPB is a no-connect (N/C) terminal and must remain unconnected and electrically floating. It has no internal connection and serves only as a mechanical placeholder in the SOT-23 (DBV) package. PCB layout must omit any trace, pad, or solder mask opening for Pin 1 to avoid unintended coupling or stress-induced parametric shift.
Can LM4128DQ1MFX3.3/NOPB drive a 10 µF capacitive load?
Yes, LM4128DQ1MFX3.3/NOPB is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, including low-ESR ceramic types. Unlike many references, it does not require series resistance or external compensation. This capability simplifies design in applications like precision DAC buffers or fast-settling ADC references where large output capacitance improves transient response.
Is LM4128DQ1MFX3.3/NOPB qualified for automotive applications?
Yes, LM4128DQ1MFX3.3/NOPB is AEC-Q100 Grade 1 qualified (−40°C to +125°C junction temperature), manufactured on an automotive-grade flow, and marked as LM4128DQ-series. Its datasheet specifies automotive-grade testing, packaging, and reliability metrics - making it suitable for non-safety-critical automotive subsystems such as cabin sensors, body control modules, and infotainment power management.
LM4128DQ1MFX3.3/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):
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128DQ1MFX3.3/NOPB FAQ
1.How can I place an order for LM4128DQ1MFX3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DQ1MFX3.3/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 LM4128DQ1MFX3.3/NOPB reliable?
The price and inventory of LM4128DQ1MFX3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128DQ1MFX3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128DQ1MFX3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DQ1MFX3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DQ1MFX3.3/NOPB?
LM4128DQ1MFX3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DQ1MFX3.3/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 LM4128DQ1MFX3.3/NOPB?
For technical support, including LM4128DQ1MFX3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DQ1MFX3.3/NOPB requirements.
6.How does Aetrix verify that LM4128DQ1MFX3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128DQ1MFX3.3/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 LM4128DQ1MFX3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128DQ1MFX3.3/NOPB?
All LM4128DQ1MFX3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DQ1MFX3.3/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 LM4128DQ1MFX3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4128DQ1MFX3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128DQ1MFX3.3/NOPB Tags
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