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Texas Instruments LM4128BQ1MFX2.0/NOPB
- Part No.:
- LM4128BQ1MFX2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BQ1MFX2.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,222
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Product details
Overview
LM4128BQ1MFX2.0/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 2.048 V output with ±0.2% initial accuracy, 75 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 LM4128BQ1MFX2.0/NOPB datasheet, LM4128BQ1MFX2.0/NOPB pinout, LM4128BQ1MFX2.0/NOPB application, or LM4128BQ1MFX2.0/NOPB equivalent, this page provides verified specifications, validated pin functions, confirmed automotive-grade thermal performance, and real-world design implications for high-accuracy analog subsystems.
Technical Context
The LM4128BQ1MFX2.0/NOPB implements a band-gap–based series reference architecture with internal enable logic and no external capacitor requirement for stability. Its 400 mV dropout voltage enables operation from low headroom supplies such as 2.5 V rails while maintaining 2.048 V output regulation across 0–20 mA loads.
Designed for AEC-Q100 Grade 1 qualification, it guarantees −40°C to +125°C junction operation with 75 ppm/°C tempco (B grade), 50 ppm long-term stability over 1000 hours, and 190 µV thermal hysteresis - critical for automotive ADAS sensor calibration and industrial process control loops where drift must be bounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal, ±0.2% initial accuracy - matches 12-bit DAC full-scale reference points without trimming. |
| Temperature Coefficient | 75 ppm/°C max (B grade) - ensures ≤±156 ppm total drift over −40°C to +125°C, equivalent to ±0.32 mV error. |
| Supply Current | 60 µA typical - enables multi-year battery life in portable data loggers drawing <100 µA average system current. |
| Shutdown Current | 3–7 µA with EN = 0 V - allows microcontroller-gated power cycling in wake-on-event sensor nodes. |
| Dropout Voltage | 175–400 mV at 10 mA - supports direct regulation from single-cell LiFePO₄ (3.2 V) or dual-cell alkaline (3.0 V) supplies. |
| Load Regulation | 25–120 ppm/mA - maintains ≤±240 µV output shift across full 20 mA load range, suitable for driving ADC reference inputs. |
| Noise (0.1–10 Hz) | 190 µVPP - low enough for 16-bit SAR ADCs without additional filtering in precision measurement front-ends. |
Pinout & Package
LM4128BQ1MFX2.0/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 marked by a dot; pin 3 (EN) is active-high with 35% VIN low threshold and 65% VIN high threshold.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must remain unconnected and floating - not bonded internally; routing to ground or VIN violates specification. |
| Pin 2 (GND) | Analog ground reference | Low-impedance return path for reference current; requires dedicated ground plane connection near device to minimize noise coupling. |
| Pin 3 (EN) | Enable control input | Active-high digital input; pulls up internally with ~2 µA; drives into shutdown when pulled below 35% VIN. |
| Pin 4 (VIN) | Input supply rail | Accepts 2.448 V to 5.5 V (VREF + 400 mV min); requires ≥0.1 µF ceramic input capacitor (X5R/X7R) for stability. |
| Pin 5 (VREF) | Precision output terminal | 2.048 V regulated source; stable with 0–10 µF capacitive loads; output impedance <1 Ω below 10 kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Grade-B automotive qualification | LM4128BQ variant qualified to AEC-Q100 Grade 1 (−40°C to +125°C), enabling use in engine control modules and ABS sensors. |
| No external stabilization capacitor | Internally compensated to remain stable without COUT, reducing BOM count and PCB area in space-constrained modules. |
| Indefinite short-circuit protection | Self-limits output current to 75 mA during fault, preventing damage during board-level ESD or wiring shorts. |
| Low ESR ceramic capacitor compatibility | Stable with X5R/X7R dielectrics - avoids aging and bias-voltage derating issues common with tantalum or electrolytic types. |
| Programmable turn-on time | 33.2 µs (1 µF load) to 78.8 µs (10 µF load) - enables deterministic power sequencing in multi-rail systems. |
Applications
| Automotive Sensor Calibration | Portable Data Acquisition |
|---|---|
Use Scenario: Calibrating MEMS pressure sensors in brake master cylinder modules under wide ambient temperature swings. IC Role / Device Role / Timing Role: Provides stable 2.048 V reference for 12-bit ADC digitization of sensor bridge outputs. Use Value: 75 ppm/°C tempco and −40°C to +125°C operation ensure ≤±0.32 mV reference error across vehicle lifetime, meeting ISO 26262 ASIL-B accuracy requirements. |
Use Scenario: Battery-powered handheld multimeter measuring DC voltages from 0.1 V to 20 V with 0.1% accuracy. IC Role / Device Role / Timing Role: Serves as primary reference for auto-ranging ADC and precision gain-setting DAC. Use Value: 60 µA quiescent current extends 2×AA battery life beyond 1 year; enable pin allows MCU-controlled sleep/wake cycles. |
| Industrial Process Transmitter | Medical Patient Monitor Front-End |
Use Scenario: 4–20 mA loop-powered temperature transmitter operating in refinery environments. IC Role / Device Role / Timing Role: Supplies excitation voltage and reference for RTD-to-current conversion circuitry. Use Value: 400 mV dropout enables operation from 3.3 V loop supply; 50 ppm long-term stability minimizes annual recalibration frequency. |
Use Scenario: ECG amplifier stage requiring ultra-low-noise, drift-free reference for baseline correction. IC Role / Device Role / Timing Role: Delivers clean 2.048 V reference to instrumentation amplifier and anti-aliasing filter stages. Use Value: 190 µVPP (0.1–10 Hz) noise and 190 µV thermal hysteresis prevent false arrhythmia detection in sub-µV biopotential signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3020AIDBZR | 2.048 V, ±0.2% initial accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-3 - no enable pin, lower tempco, but no shutdown mode. | Lacks EN pin; unsuitable for power-gated systems requiring µA-level standby current. | Select when lowest possible drift is prioritized over shutdown capability and board space is constrained (3-pin vs 5-pin). |
| MAX6029BASA20+ | 2.048 V, ±0.2% initial accuracy, 75 ppm/°C, 65 µA IQ, SO-8 - includes trim pin for post-package calibration. | SO-8 package occupies >3× PCB area; trim capability adds cost and test complexity. | Select when field calibration or production-line trimming is required to meet tighter system-level tolerance budgets. |
Compared with REF3020AIDBZR and MAX6029BASA20+, the LM4128BQ1MFX2.0/NOPB uniquely combines AEC-Q100 Grade 1 qualification, integrated enable functionality, and SOT-23-5 packaging - making it the only choice for automotive-qualified, low-power, space-constrained reference designs requiring active power management.
Availability
LM4128BQ1MFX2.0/NOPB is available at Aetrix Electronics and suitable for automotive sensor modules, portable test equipment, industrial transmitters, and medical monitoring devices requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM4128BQ1MFX2.0/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 reference design and automotive-grade reliability validation.
The LM4128Q product line delivers AEC-Q100 qualified, micropower voltage references optimized for harsh-environment signal chains in automotive, industrial, and medical applications where accuracy, stability, and low power are non-negotiable.
FAQ
What is the guaranteed initial accuracy of LM4128BQ1MFX2.0/NOPB over temperature?
The LM4128BQ1MFX2.0/NOPB is specified as a B-grade device with ±0.2% initial accuracy at 25°C, and its temperature coefficient is guaranteed ≤75 ppm/°C over −40°C to +125°C. This means total output deviation remains within ±0.2% plus drift contribution - e.g., at 125°C, worst-case error is ±0.2% + (85°C × 75 ppm/°C) = ±0.2% + 6375 ppm ≈ ±0.264%, fully documented in TI's SNVS475E datasheet.
Does LM4128BQ1MFX2.0/NOPB require an external output capacitor for stability?
No, the LM4128BQ1MFX2.0/NOPB is internally compensated and stable with or without an output capacitor, supporting capacitive loads up to 10 µF. An optional COUT improves load transient response but is not required for stability - unlike many older references that mandate minimum COUT values. Input capacitor CIN ≥0.1 µF is mandatory.
What is the maximum load current supported by LM4128BQ1MFX2.0/NOPB?
The LM4128BQ1MFX2.0/NOPB supports up to 20 mA of continuous output current while maintaining regulation within specifications. At 20 mA load, dropout voltage remains ≤400 mV, and load regulation is specified at 25–120 ppm/mA - meaning output shifts ≤±240 µV across full load range, verified per Electrical Characteristics table in SNVS475E.
How does the enable pin (EN) function on LM4128BQ1MFX2.0/NOPB?
Pin 3 (EN) is an active-high enable input with internal ~2 µA pull-up. It enters shutdown mode (IQ = 3–7 µA) when pulled below 35% of VIN, and enables normal operation when driven above 65% of VIN. The pin may be tied directly to VIN for always-on use, or driven by a microcontroller GPIO - no external pull-up resistor needed.
Is LM4128BQ1MFX2.0/NOPB qualified for automotive applications?
Yes, LM4128BQ1MFX2.0/NOPB is part of the LM4128Q family and explicitly qualified to AEC-Q100 Grade 1 (−40°C to +125°C), manufactured on an automotive-grade flow. Its datasheet lists "LM4128AQ/BQ/CQ/DQ are AEC-Q100 Grade 1 Qualified" and confirms automotive qualification in Package Option Addendum and Features sections.
LM4128BQ1MFX2.0/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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 190µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.448V ~ 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
LM4128BQ1MFX2.0/NOPB FAQ
1.How can I place an order for LM4128BQ1MFX2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BQ1MFX2.0/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 LM4128BQ1MFX2.0/NOPB reliable?
The price and inventory of LM4128BQ1MFX2.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BQ1MFX2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BQ1MFX2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BQ1MFX2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BQ1MFX2.0/NOPB?
LM4128BQ1MFX2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BQ1MFX2.0/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 LM4128BQ1MFX2.0/NOPB?
For technical support, including LM4128BQ1MFX2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BQ1MFX2.0/NOPB requirements.
6.How does Aetrix verify that LM4128BQ1MFX2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BQ1MFX2.0/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 LM4128BQ1MFX2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BQ1MFX2.0/NOPB?
All LM4128BQ1MFX2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BQ1MFX2.0/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 LM4128BQ1MFX2.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128BQ1MFX2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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