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Texas Instruments LM4128BQ1MFX1.8/NOPB
- Part No.:
- LM4128BQ1MFX1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BQ1MFX1.8/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,679
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Product details
Overview
LM4128BQ1MFX1.8/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 1.8 V output with ±0.2% initial accuracy, 75 ppm/°C 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 across −40°C to +125°C - ideal for battery-powered instrumentation and automotive sensor signal conditioning.
For engineers reviewing the LM4128BQ1MFX1.8/NOPB datasheet, LM4128BQ1MFX1.8/NOPB pinout, LM4128BQ1MFX1.8/NOPB application, or LM4128BQ1MFX1.8/NOPB equivalent, key selection criteria include dropout voltage (200–400 mV at 10 mA), line regulation (30 ppm/V), load regulation (25–120 ppm/mA), low-noise performance (170 µVPP, 0.1–10 Hz), and AEC-Q100 Grade 1 qualification for automotive use.
Technical Context
The LM4128BQ1MFX1.8/NOPB uses an internal band-gap-derived reference architecture optimized for low quiescent current and high stability without requiring external compensation. Its enable-controlled startup sequence and built-in short-circuit protection (75 mA limit) support robust operation in transient-prone environments.
It maintains regulation over VIN = VREF + 400 mV to 5.5 V, remains stable with capacitive loads up to 10 µF, and achieves thermal hysteresis of 75 ppm - validated across −40°C to +125°C junction temperature range per AEC-Q100 Grade 1 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.2% initial accuracy (B grade) - ensures ADC/DAC reference error ≤3.6 mV at room temperature |
| Temperature Coefficient | 75 ppm/°C max - contributes ≤135 ppm (0.024% of 1.8 V) drift over −40°C to +125°C |
| Supply Current | 60 µA typical - enables >1-year battery life in 10 µA-sleep systems with periodic wake-up |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces system standby power by >90% vs active mode |
| Dropout Voltage | 200–400 mV at 10 mA load - allows operation from single-cell Li-ion (3.0–4.2 V) or 3.3 V rails with margin |
| Output Noise | 170 µVPP (0.1–10 Hz) - suitable for 16-bit SAR ADCs requiring <1 LSB noise at 1.8 V full-scale |
| Line Regulation | 30 ppm/V - limits output shift to ≤54 ppm (0.097 mV) over 1.8 V input variation |
Pinout & Package
LM4128BQ1MFX1.8/NOPB is housed in a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, rated for −40°C to +125°C operation and compliant with AEC-Q100 Grade 1 automotive reliability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected and floating; no internal bond or circuit connection |
| 2 - GND | Analog ground reference | Primary return path for reference current; requires low-impedance PCB connection to minimize noise coupling |
| 3 - EN | Enable control input | Active-high logic: VIH ≥65% VIN, VIL ≤35% VIN; internal ~2 µA pull-up allows direct tie-to-VIN for always-on operation |
| 4 - VIN | Input supply rail | Accepts 2.2 V to 5.5 V; minimum VIN = VREF + 400 mV ensures regulation under 10 mA load |
| 5 - VREF | Precision output terminal | Delivers stable 1.8 V reference; capable of sourcing up to 20 mA with <120 ppm/mA load regulation |
Key Features
| Feature | Design Value |
|---|---|
| Grade-B precision | ±0.2% initial accuracy and 75 ppm/°C tempco - meets mid-tier industrial and automotive calibration requirements without trimming |
| Enable-controlled shutdown | Reduces supply current to 3–7 µA - enables micro-power sleep modes in portable data loggers and tire pressure sensors |
| Capacitor-free stability | Stable with no COUT; supports optional 0.1–10 µF ceramic output caps to improve transient response without oscillation risk |
| AEC-Q100 Grade 1 qualified | Validated for −40°C to +125°C operation with lifetime reliability testing - suitable for engine control, ADAS, and body electronics |
| Low dropout operation | 200 mV min dropout at 10 mA - enables use behind LDOs or directly from partially discharged batteries |
Applications
| Instrumentation Signal Chain | Automotive Sensor Interface |
|---|---|
|
Use Scenario: Precision analog front-end for thermocouple or RTD measurement in handheld calibrators. IC Role / Device Role / Timing Role: Provides stable 1.8 V reference for 24-bit delta-sigma ADC and programmable gain amplifier. Use Value: Enables <0.01% total unadjusted error (TUE) over temperature via 75 ppm/°C tempco and 170 µVPP noise. |
Use Scenario: Reference for pressure and position sensor signal conditioning in powertrain modules. IC Role / Device Role / Timing Role: Supplies excitation and reference voltage for Wheatstone bridge interfaces in harsh under-hood environments. Use Value: AEC-Q100 Grade 1 qualification and −40°C to +125°C operation ensure functional safety compliance without derating. |
| Portable Medical Monitoring | Battery-Powered Data Acquisition |
|
Use Scenario: ECG and pulse oximetry analog subsystem in wearable patient monitors. IC Role / Device Role / Timing Role: Delivers ultra-low-noise 1.8 V reference for biopotential amplifiers and SAR ADCs sampling at 1 kSPS. Use Value: 60 µA supply current extends coin-cell battery life beyond 6 months while maintaining 16-bit effective resolution. |
Use Scenario: Remote environmental sensor node logging temperature, humidity, and gas concentration. IC Role / Device Role / Timing Role: Serves as master reference for multi-channel ADC and DAC in low-duty-cycle IoT edge devices. Use Value: Enable pin allows synchronous shutdown during sleep, reducing average system current to sub-µA levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6029BASA18+T | 1.8 V, ±0.2% accuracy, 50 ppm/°C, 35 µA IQ, SC70-5 package | Lower tempco and supply current but no enable pin; not AEC-Q100 qualified | Prefer when lowest drift and power are critical and automotive qualification is unnecessary |
| ADR3418ARJZ-R7 | 1.8 V, ±0.1% accuracy, 30 ppm/°C, 120 µA IQ, SOT-23-5 package | Higher initial accuracy and lower tempco, but higher supply current and no shutdown mode | Choose when highest absolute accuracy is required and continuous operation is acceptable |
Compared with MAX6029BASA18+T and ADR3418ARJZ-R7, LM4128BQ1MFX1.8/NOPB uniquely balances AEC-Q100 Grade 1 compliance, enable-controlled ultra-low-power shutdown (3–7 µA), and SOT-23 footprint - making it optimal for automotive and portable systems where qualification, dynamic power management, and board space are jointly constrained.
Availability
LM4128BQ1MFX1.8/NOPB is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable medical monitoring, and battery-powered data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128BQ1MFX1.8/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, embedded processing, and connectivity technologies, with decades of expertise in precision analog ICs and automotive-grade components.
LM4128BQ1MFX1.8/NOPB belongs to TI's LM4128Q automotive-qualified voltage reference family, designed specifically for high-reliability signal conditioning in engine control units, ADAS sensors, and body electronics demanding AEC-Q100 Grade 1 operation.
FAQ
What is the operating temperature range for LM4128BQ1MFX1.8/NOPB?
The LM4128BQ1MFX1.8/NOPB is qualified for −40°C to +125°C junction temperature operation per AEC-Q100 Grade 1 standards. This range is fully supported by its electrical specifications - including ±0.2% initial accuracy, 75 ppm/°C tempco, and 60 µA supply current - across the entire span without derating. The device undergoes accelerated stress testing to ensure reliability in automotive under-hood and industrial control environments.
Does LM4128BQ1MFX1.8/NOPB require an external output capacitor?
No, LM4128BQ1MFX1.8/NOPB is internally compensated and stable without an output capacitor. An optional ceramic COUT (0.1–10 µF) may be added to improve load transient response - especially when switching between light and heavy loads - but introduces no stability risk. Input capacitor CIN ≥ 0.1 µF is mandatory; CIN must be ≥ COUT if both are used.
What is the minimum input voltage required for LM4128BQ1MFX1.8/NOPB to regulate properly?
The minimum input voltage for LM4128BQ1MFX1.8/NOPB is VREF + 400 mV (i.e., 2.2 V) at 10 mA load, per datasheet specification. Dropout voltage is specified as 200–400 mV depending on load and temperature. At lighter loads (<1 mA), regulation is maintained down to ~2.05 V, but design margin should maintain VIN ≥ 2.2 V to guarantee 1.8 V output accuracy and stability across temperature and process variation.
How does the enable pin function on LM4128BQ1MFX1.8/NOPB?
The EN pin on LM4128BQ1MFX1.8/NOPB is active-high with VIH ≥65% VIN and VIL ≤35% VIN. When pulled high (≥65% VIN), the device operates normally; when pulled low (≤35% VIN), it enters shutdown mode drawing only 3–7 µA. An internal ~2 µA pull-up allows direct connection to VIN for always-on operation. Floating EN is not recommended - tie to VIN or ground via appropriate logic.
Is LM4128BQ1MFX1.8/NOPB pin-compatible with other LM4128Q variants?
Yes, all LM4128Q variants - including LM4128BQ1MFX1.8/NOPB, LM4128BQ1MFX2.5/NOPB, and LM4128BQ1MFX3.3/NOPB - share identical 5-pin SOT-23 (DBV) packaging, pinout, and footprint. Only the output voltage and part marking differ; no PCB layout change is needed when substituting between voltage options within the same grade and package.
LM4128BQ1MFX1.8/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:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°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
LM4128BQ1MFX1.8/NOPB FAQ
1.How can I place an order for LM4128BQ1MFX1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BQ1MFX1.8/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 LM4128BQ1MFX1.8/NOPB reliable?
The price and inventory of LM4128BQ1MFX1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BQ1MFX1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BQ1MFX1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BQ1MFX1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BQ1MFX1.8/NOPB?
LM4128BQ1MFX1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BQ1MFX1.8/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 LM4128BQ1MFX1.8/NOPB?
For technical support, including LM4128BQ1MFX1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BQ1MFX1.8/NOPB requirements.
6.How does Aetrix verify that LM4128BQ1MFX1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BQ1MFX1.8/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 LM4128BQ1MFX1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BQ1MFX1.8/NOPB?
All LM4128BQ1MFX1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BQ1MFX1.8/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 LM4128BQ1MFX1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4128BQ1MFX1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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