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Texas Instruments LM4128DQ1MFX1.8/NOPB
- Part No.:
- LM4128DQ1MFX1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DQ1MFX1.8/NOPB.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,220
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Product details
Overview
LM4128DQ1MFX1.8/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 1.8 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, 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 LM4128DQ1MFX1.8/NOPB datasheet, LM4128DQ1MFX1.8/NOPB pinout, LM4128DQ1MFX1.8/NOPB application, or LM4128DQ1MFX1.8/NOPB equivalent, this page provides verified electrical parameters, thermal stability data, enable logic thresholds, dropout behavior at 10 mA, and real-world noise performance (170 µVPP, 0.1–10 Hz) critical for low-power precision ADC biasing and closed-loop regulator references.
Technical Context
The LM4128DQ1MFX1.8/NOPB uses a band-gap-derived architecture optimized for low quiescent current and high PSRR (≥60 dB at 1 kHz). Its internal enable circuit includes a 2 µA pull-up, requiring external drive below 35% of VIN for disable and above 65% for enable - compatible with standard CMOS logic levels when VIN ≥ 2.5 V.
It achieves stability without mandatory output capacitance but requires ≥0.1 µF ceramic CIN (X5R/X7R); it drives capacitive loads up to 10 µF while maintaining <100 µs turn-on time under typical conditions. Dropout is specified at 200–400 mV (10 mA load), enabling operation from single-cell Li-ion or 3.3 V rails with margin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±1.0% initial accuracy (Grade D) - ensures ≤±18 mV absolute error at 25°C for 12-bit ADC reference scaling |
| Tempco | 100 ppm/°C max (−40°C to +125°C) - contributes ≤±180 µV/°C drift, limiting total error to <±22 mV across full range |
| Supply Current | 60 µA typical (active), 3–7 µA in shutdown - enables >1-year battery life in 10 µA average-current portable systems |
| Dropout Voltage | 200–400 mV at 10 mA load - allows operation from 2.0 V input (e.g., discharged LiFePO4) while maintaining regulation |
| Noise (0.1–10 Hz) | 170 µVPP - supports 16-bit SAR ADCs without additional filtering in precision data acquisition |
| Enable Thresholds | VIL ≤35% VIN, VIH ≥65% VIN - ensures robust interface with 1.8 V or 3.3 V GPIO without level shifters |
| Long-Term Stability | 50 ppm over 1000 hours - guarantees <±90 µV drift in field-deployed medical or industrial sensors |
Pinout & Package
LM4128DQ1MFX1.8/NOPB is housed in a 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 NC (no connect), requiring floating connection; thermal pad is absent.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No-connect terminal | Must remain unconnected; no internal bond wire - floating prevents parasitic coupling or ESD path disruption |
| 2 (GND) | Analog ground reference | Primary return for reference output and enable logic; requires low-impedance PCB plane tie to minimize noise injection |
| 3 (EN) | Digital enable control | Active-high input with internal 2 µA pull-up; driven low (<0.63 V @ 3.3 V VIN) disables output and reduces current to ≤7 µA |
| 4 (VIN) | Input supply rail | Accepts 2.2 V to 5.5 V (VREF + 400 mV min); must be bypassed with ≥0.1 µF X5R/X7R ceramic capacitor placed adjacent to pin |
| 5 (VREF) | Precision reference output | 1.8 V regulated source capable of sourcing up to 20 mA; stable with 0–10 µF capacitive loads; sensitive to trace inductance |
Key Features
| Feature | Design Value |
|---|---|
| Grade-D precision | ±1.0% initial accuracy and 100 ppm/°C tempco - balances cost and performance for non-critical industrial sensing |
| Enable-controlled shutdown | Reduces supply current to 3–7 µA - enables duty-cycled operation in wireless sensor nodes without external switches |
| Capacitor-flexible stability | Stable with 0–10 µF output capacitance and ≥0.1 µF input capacitance - eliminates need for custom compensation networks |
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to +125°C) - qualified for engine control, ADAS camera modules, and body electronics |
| Low-noise output | 170 µVPP (0.1–10 Hz) - meets noise floor requirements for 16-bit delta-sigma ADCs in portable test equipment |
Applications
| Portable Data Loggers | Automotive Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring node sampling temperature, humidity, and pressure at 1 Hz using a 16-bit ADC. IC Role / Device Role / Timing Role: Provides stable 1.8 V reference for ADC VREF input and microcontroller analog peripherals. Use Value: 60 µA quiescent current extends CR2032 coin-cell life beyond 2 years; 100 ppm/°C tempco maintains <±0.02% full-scale error across vehicle cabin temperatures. |
Use Scenario: Front-end signal conditioning for MEMS-based tire pressure sensors in TPMS modules. IC Role / Device Role / Timing Role: Supplies excitation voltage and reference for ratiometric bridge measurement and ADC conversion. Use Value: AEC-Q100 Grade 1 rating ensures reliability at 125°C under hood; enable pin synchronizes reference activation with RF transmission bursts to minimize average power. |
| Industrial PLC Analog Input Modules | Medical Patient Monitoring Devices |
|
Use Scenario: 4–20 mA loop-powered analog input card measuring thermocouple and RTD signals in factory automation. IC Role / Device Role / Timing Role: Generates precise 1.8 V reference for programmable gain instrumentation amplifiers and sigma-delta ADCs. Use Value: 20 mA output capability supports multiple PGA channels; long-term stability (50 ppm/1000 hrs) reduces calibration frequency in maintenance-critical infrastructure. |
Use Scenario: Portable ECG device acquiring biopotential signals with 24-bit resolution and 100 dB SNR requirement. IC Role / Device Role / Timing Role: Supplies low-noise 1.8 V reference for ADC and analog front-end filters. Use Value: 170 µVPP (0.1–10 Hz) noise floor directly enables sub-µV signal resolution without post-processing; shutdown mode cuts idle current during sleep intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AUT18+T | 0.06% initial accuracy, 3 ppm/°C tempco, 65 µA IQ, SOT-23-5 | Higher precision and lower drift - suited for metrology-grade instruments where LM4128DQ1MFX1.8/NOPB's ±1% error is insufficient | Select MAX6126AUT18+T when 14-bit+ system accuracy demands sub-100 ppm total error budget; verify layout compatibility with tighter noise immunity requirements |
| ADR3418ARJZ-R7 | 0.1% initial accuracy, 10 ppm/°C tempco, 120 µA IQ, SOT-23-5 | Lower tempco and better long-term stability (20 ppm/1000 hrs), but higher supply current - trades battery life for enhanced thermal performance | Choose ADR3418ARJZ-R7 for applications operating across wide ambient swings (e.g., outdoor base stations) where LM4128DQ1MFX1.8/NOPB's 100 ppm/°C drift dominates error |
Compared with LM4128DQ1MFX1.8/NOPB, MAX6126AUT18+T delivers 16× tighter initial tolerance and 33× lower tempco at modest IQ increase, while ADR3418ARJZ-R7 offers 10× better tempco and 2.5× better long-term stability - both require revalidation of enable timing and noise filtering due to differing PSRR profiles.
Availability
LM4128DQ1MFX1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor interfaces, and industrial PLC analog input modules requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LM4128DQ1MFX1.8/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 and embedded processing technologies, with decades of expertise in precision analog ICs and automotive-qualified components.
The LM4128 family was designed for space-constrained, battery-operated systems needing low-power, high-stability voltage references - particularly targeting instrumentation, automotive sensors, and portable medical devices where grade-flexible accuracy and enable control are essential.
FAQ
What is the maximum allowable input voltage for LM4128DQ1MFX1.8/NOPB?
The absolute maximum input voltage for LM4128DQ1MFX1.8/NOPB is 6 V, but the recommended operating maximum is 5.5 V per the Electrical Characteristics table. Exceeding 5.5 V risks violating the Absolute Maximum Ratings and may cause permanent damage or parametric shift. The device functions correctly within VREF + 400 mV (i.e., ≥2.2 V) up to 5.5 V at 10 mA load.
Does LM4128DQ1MFX1.8/NOPB require an external output capacitor?
No, LM4128DQ1MFX1.8/NOPB is stable without an external output capacitor and is rated for capacitive loads up to 10 µF. An output capacitor (COUT) is optional but improves load transient response when switching between light and heavy loads. If used, low-ESR ceramic types (X5R/X7R) are recommended and must be placed close to the VREF and GND pins.
What is the function of Pin 1 (NC) on LM4128DQ1MFX1.8/NOPB?
Pin 1 on LM4128DQ1MFX1.8/NOPB is a no-connect terminal with no internal connection. It must remain electrically floating - neither tied to GND nor routed - to avoid introducing parasitic coupling paths or compromising ESD protection integrity. This pin has no role in thermal dissipation or signal routing.
How does the enable pin (Pin 3) behave in LM4128DQ1MFX1.8/NOPB?
The enable pin (Pin 3) on LM4128DQ1MFX1.8/NOPB is active-high with an internal 2 µA pull-up. When pulled below 35% of VIN, the device enters shutdown mode (IQ ≤7 µA); when driven above 65% of VIN, it enables the reference output. It is not 5 V tolerant if VIN < 5 V, and must never exceed VIN to prevent malfunction.
Is LM4128DQ1MFX1.8/NOPB suitable for automotive applications?
Yes, LM4128DQ1MFX1.8/NOPB is LM4128DQ-grade and AEC-Q100 Grade 1 qualified (−40°C to +125°C), manufactured on an automotive-grade flow. It is explicitly listed in TI's documentation for automotive and industrial electronics, with validated performance across temperature cycling, thermal hysteresis (75 ppm), and long-term stability - making it appropriate for engine control, ADAS, and body electronics.
LM4128DQ1MFX1.8/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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 170µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.2V ~ 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
LM4128DQ1MFX1.8/NOPB FAQ
1.How can I place an order for LM4128DQ1MFX1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DQ1MFX1.8/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 LM4128DQ1MFX1.8/NOPB reliable?
The price and inventory of LM4128DQ1MFX1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128DQ1MFX1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128DQ1MFX1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DQ1MFX1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DQ1MFX1.8/NOPB?
LM4128DQ1MFX1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DQ1MFX1.8/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 LM4128DQ1MFX1.8/NOPB?
For technical support, including LM4128DQ1MFX1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DQ1MFX1.8/NOPB requirements.
6.How does Aetrix verify that LM4128DQ1MFX1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128DQ1MFX1.8/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 LM4128DQ1MFX1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128DQ1MFX1.8/NOPB?
All LM4128DQ1MFX1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DQ1MFX1.8/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 LM4128DQ1MFX1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4128DQ1MFX1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128DQ1MFX1.8/NOPB Tags
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