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Texas Instruments LM4128AQ1MF1.8/NOPB
- Part No.:
- LM4128AQ1MF1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AQ1MF1.8/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,237
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Product details
Overview
LM4128AQ1MF1.8/NOPB from Texas Instruments is an AEC-Q100 Grade 1 qualified, precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 1.8 V output with ±0.1% initial accuracy, 75 ppm/°C max temperature coefficient, and 60 µA supply current - optimized for automotive sensor signal conditioning and battery-powered data acquisition systems.
For engineers reviewing the LM4128AQ1MF1.8/NOPB datasheet, LM4128AQ1MF1.8/NOPB pinout, LM4128AQ1MF1.8/NOPB application, or LM4128AQ1MF1.8/NOPB equivalent, this page provides verified technical context, grade-specific performance boundaries, automotive-grade thermal stability, enable-controlled shutdown behavior, and real-world load regulation data across −40°C to +125°C.
Technical Context
The LM4128AQ1MF1.8/NOPB implements a band-gap-derived series reference architecture with internal enable logic and no external stabilization capacitor requirement. It operates with input voltages as low as VREF + 400 mV (i.e., ≥2.2 V) up to 5.5 V and supports capacitive loads up to 10 µF while maintaining stability.
Its A-grade specification ensures guaranteed 0.1% initial accuracy and ≤75 ppm/°C temperature coefficient over full automotive junction temperature range (−40°C to +125°C), with 3 µA shutdown current when EN is pulled low and 25 ppm/mA load regulation up to 20 mA output current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.1% initial accuracy (A-grade) - enables 12-bit ADC biasing without calibration at room temperature |
| Tempco | ≤75 ppm/°C over −40°C to +125°C - ensures <±1.35 mV total drift across full automotive temperature range |
| Supply Current | 60 µA typical at 25°C - supports >1-year battery life in 10 µA-sleep IoT nodes with periodic 1.8 V reference activation |
| Shutdown Current | 3 µA max at EN = 0 V - reduces system standby power by >95% vs active mode |
| Dropout Voltage | 200 mV min / 400 mV max at 10 mA - allows operation from single-cell LiFePO₄ (2.8–3.6 V) or coin cell with margin |
| Line Regulation | 30 ppm/V from VREF+400 mV to 5.5 V - maintains <±0.054 mV output shift per volt input change |
| Noise (0.1–10 Hz) | 170 µVPP - suitable for 16-bit SAR ADCs requiring <1 LSB noise contribution at 1.8 V full-scale |
Pinout & Package
LM4128AQ1MF1.8/NOPB uses the 5-pin SOT-23 (DBV) package (Package Number DBV, R-PDSO-G5), measuring 2.9 mm × 1.6 mm × 1.15 mm, with gull-wing leads and RoHS-compliant matte tin (SN) lead finish. Thermal resistance θJ-A = 220°C/W enables 125°C junction operation at ≤10 mA load in standard PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected and floating; not internally bonded - avoids parasitic coupling or ESD path errors |
| 2 - GND | Analog ground reference | Primary return path for reference core and enable circuitry; requires low-impedance connection to clean analog ground plane |
| 3 - EN | Active-high enable input | Drives internal regulator when ≥65% of VIN; pulls to GND for 3 µA shutdown - compatible with 1.8 V/3.3 V GPIO |
| 4 - VIN | Input supply rail | Accepts 2.2 V to 5.5 V; must be bypassed with ≥0.1 µF ceramic capacitor (X5R/X7R) placed within 2 mm of pin |
| 5 - VREF | Precision 1.8 V output | Delivers regulated 1.8 V with ≤25 ppm/mA load regulation; stable driving 10 µF ceramic or resistive-capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive applications with guaranteed operation from −40°C to +125°C junction temperature |
| No external capacitor required | Stable without COUT; eliminates BOM cost and layout area while supporting optional 0.1–10 µF output capacitance for transient improvement |
| Low dropout (200 mV min) | Enables direct regulation from low-voltage batteries (e.g., LiFePO₄, NiMH) without pre-regulation stage |
| Indefinite short-circuit protection | Self-limits output to 75 mA during fault - prevents thermal runaway and enables safe integration in unattended systems |
| 170 µVPP (0.1–10 Hz) noise | Meets noise floor requirements for 16-bit precision data converters sampling at ≤10 kSPS without additional filtering |
Applications
| Automotive Sensor Signal Conditioning | Portable Data Acquisition Systems |
|---|---|
Use Scenario: Reference for 12-bit ADC in engine coolant temperature (ECT) and manifold absolute pressure (MAP) sensors under hood conditions. IC Role / Device Role / Timing Role: Provides stable 1.8 V reference for ratiometric sensor excitation and ADC conversion, rejecting supply ripple and thermal drift. Use Value: Maintains ±0.1% accuracy over −40°C to +125°C, eliminating need for per-unit calibration and enabling ASIL-B compliant diagnostics. |
Use Scenario: Battery-powered handheld multimeter with dual-range 16-bit SAR ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Supplies precision 1.8 V reference for ADC and programmable gain amplifier (PGA), enabled only during measurement cycles. Use Value: 60 µA operating current and 3 µA shutdown reduce average power to <1 µA in sleep mode, extending CR2032 battery life beyond 2 years. |
| Industrial Process Monitoring Nodes | Medical Vital Sign Sensors |
Use Scenario: Wireless 4–20 mA loop-powered transmitter monitoring pH and dissolved oxygen in water treatment plants. IC Role / Device Role / Timing Role: Generates accurate 1.8 V reference for sigma-delta ADC and digital isolator interface, operating from 3.3 V LDO derived from loop power. Use Value: 75 ppm/°C tempco and 50 ppm long-term stability ensure <±0.02% reading error over 5-year field deployment without recalibration. |
Use Scenario: Wearable ECG patch with ultra-low-power MCU and analog front-end acquiring microvolt-level cardiac signals. IC Role / Device Role / Timing Role: Supplies low-noise 1.8 V reference for instrumentation amplifier and ADC, synchronized with acquisition window. Use Value: 170 µVPP (0.1–10 Hz) noise contributes <0.5 LSB error to 1.8 V full-scale 16-bit conversion, preserving diagnostic fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6029AEUR+T | 1.8 V, ±0.1% initial accuracy, 30 ppm/°C tempco, but no enable pin and 85 µA supply current | Lacks shutdown control; unsuitable for duty-cycled systems requiring µA-level standby | Select when lowest possible tempco is critical and enable functionality is unnecessary |
| ADR3418ARJZ-R7 | 1.8 V, ±0.1% initial accuracy, 50 ppm/°C tempco, 125 µA supply current, and no enable pin | Higher quiescent current limits battery life; no automotive qualification (only industrial −40°C to +125°C) | Select when tighter tempco is needed and AEC-Q100 compliance is not required |
Compared with MAX6029AEUR+T and ADR3418ARJZ-R7, LM4128AQ1MF1.8/NOPB uniquely combines AEC-Q100 Grade 1 qualification, integrated enable pin for sub-µA shutdown, and SOT-23 footprint - making it the only choice for automotive and industrial battery-constrained designs demanding both precision and controllability.
Availability
LM4128AQ1MF1.8/NOPB is available at Aetrix Electronics and suitable for automotive sensor modules, portable test equipment, and industrial process transmitters requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LM4128AQ1MF1.8/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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and automotive electronics.
LM4128AQ1MF1.8/NOPB belongs to TI's LM4128Q automotive-qualified voltage reference family, designed specifically for high-reliability applications where accuracy, thermal stability, and functional safety compliance are mandatory.
FAQ
What is the guaranteed initial accuracy of LM4128AQ1MF1.8/NOPB over temperature?
The LM4128AQ1MF1.8/NOPB is an A-grade device with guaranteed ±0.1% initial accuracy at 25°C and specified performance over −40°C to +125°C junction temperature. Its maximum temperature coefficient is 75 ppm/°C, resulting in ≤±1.35 mV total output deviation across the full automotive temperature range - confirmed in the Electrical Characteristics table for LM4128A-1.8 under boldface limits.
Does LM4128AQ1MF1.8/NOPB require an external output capacitor to remain stable?
No, LM4128AQ1MF1.8/NOPB is internally compensated and stable without any output capacitor. It remains stable with capacitive loads up to 10 µF, and adding COUT (0.1–10 µF ceramic) improves load transient response but is optional. The datasheet explicitly states "The LM4128's advanced design eliminates the need for an external stabilizing capacitor" and confirms stability with up to 10 µF.
What is the minimum input voltage required for LM4128AQ1MF1.8/NOPB to regulate properly at 10 mA load?
The minimum input voltage for LM4128AQ1MF1.8/NOPB is VREF + dropout voltage. At 10 mA load, the maximum dropout is 400 mV (per Electrical Characteristics), so minimum VIN = 1.8 V + 0.4 V = 2.2 V. The datasheet specifies "VIN Range of VREF + 400 mV to 5.5V @10 mA", and the A-grade dropout is tested down to 200 mV min - confirming reliable operation from 2.2 V input.
Is LM4128AQ1MF1.8/NOPB pin-compatible with other LM4128x variants?
Yes, all LM4128x variants - including LM4128AQ1MF1.8/NOPB, LM4128AQ1MF2.5/NOPB, and LM4128AQ1MF3.3/NOPB - share identical 5-pin SOT-23 (DBV) packaging, pinout, and footprint. The only differences are output voltage and grade marking; electrical behavior (enable function, shutdown current, thermal specs) is consistent across the family per the LM4128Q datasheet.
How does the enable pin (EN) of LM4128AQ1MF1.8/NOPB interface with common microcontroller GPIOs?
The EN pin of LM4128AQ1MF1.8/NOPB is active-high with VIH ≥65% of VIN and VIL ≤35% of VIN. When VIN = 3.3 V, VIH ≥2.15 V and VIL ≤1.16 V - fully compatible with 3.3 V and 1.8 V CMOS outputs. The internal ~2 µA pull-up allows EN to be tied directly to VIN for always-on operation or driven by any standard GPIO without external components.
LM4128AQ1MF1.8/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:
- ±0.1%
- 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
LM4128AQ1MF1.8/NOPB FAQ
1.How can I place an order for LM4128AQ1MF1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AQ1MF1.8/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 LM4128AQ1MF1.8/NOPB reliable?
The price and inventory of LM4128AQ1MF1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128AQ1MF1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AQ1MF1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AQ1MF1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AQ1MF1.8/NOPB?
LM4128AQ1MF1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AQ1MF1.8/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 LM4128AQ1MF1.8/NOPB?
For technical support, including LM4128AQ1MF1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AQ1MF1.8/NOPB requirements.
6.How does Aetrix verify that LM4128AQ1MF1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AQ1MF1.8/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 LM4128AQ1MF1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AQ1MF1.8/NOPB?
All LM4128AQ1MF1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AQ1MF1.8/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 LM4128AQ1MF1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4128AQ1MF1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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