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Texas Instruments LM4128BQ1MFX3.3/NOPB
- Part No.:
- LM4128BQ1MFX3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BQ1MFX3.3/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,069
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Product details
Overview
LM4128BQ1MFX3.3/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 3.3 V output with ±0.2% initial accuracy, 75 ppm/°C max temperature coefficient, and 60 µA supply current. It supports 20 mA load current, features an enable pin for 3 µA shutdown mode, and operates from −40°C to +125°C - ideal for battery-powered instrumentation and automotive sensor signal conditioning.
For engineers reviewing the LM4128BQ1MFX3.3/NOPB datasheet, LM4128BQ1MFX3.3/NOPB pinout, LM4128BQ1MFX3.3/NOPB application, or LM4128BQ1MFX3.3/NOPB equivalent, key selection criteria include guaranteed AEC-Q100 Grade 1 qualification, dropout voltage ≤400 mV at 10 mA, stability with up to 10 µF capacitive loads, and no external stabilizing capacitor requirement.
Technical Context
The LM4128BQ1MFX3.3/NOPB uses an advanced band-gap–derived reference architecture optimized for low quiescent current and high PSRR. Its enable-controlled operation allows seamless integration into power-gated systems, while internal compensation eliminates need for external stabilization.
It maintains output regulation across input voltages from (VREF + 400 mV) to 5.5 V and load currents from 0 to 20 mA, with line regulation ≤85 ppm/V and load regulation ≤120 ppm/mA over −40°C to +125°C - meeting stringent requirements for automotive-grade data acquisition and precision regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±0.2% initial accuracy (B grade) - ensures ADC/DAC reference error ≤6.6 mV at room temperature |
| Tempco | 75 ppm/°C max - limits drift to ≤24.8 µV/°C over full range, critical for thermal-stable sensor interfaces |
| Supply Current | 60 µA typical - enables >1-year battery life in 10 µA-sleep IoT nodes with periodic measurement bursts |
| 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 - supports operation from single-cell Li-ion (3.0 V min) or 3.3 V rail with margin |
| Noise (0.1–10 Hz) | 310 µVPP - suitable for 16-bit SAR ADCs requiring <1 LSB noise at 3.3 V full-scale |
| Junction Temp Range | −40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood automotive electronics |
Pinout & Package
LM4128BQ1MFX3.3/NOPB is housed in a 5-pin SOT-23 (DBV) package (2.9 mm × 1.6 mm × 1.15 mm), RoHS-compliant, with SN lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected; floating - not tied to GND or any bias |
| 2 - GND | Analog ground reference | Low-impedance return path for reference core; requires dedicated ground plane connection |
| 3 - EN | Active-high enable input | Drives internal regulator; VIH ≥65% VIN, VIL ≤35% VIN - compatible with 1.8 V/3.3 V logic |
| 4 - VIN | Input supply | Accepts 3.7 V to 5.5 V; must exceed VREF + 400 mV for regulation - minimum 3.7 V at 3.3 V output |
| 5 - VREF | Precision reference output | 3.3 V source with 20 mA sink/source capability; stable with 0–10 µF ceramic COUT (X5R/X7R) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including engine control modules and ADAS sensor front-ends |
| No external stabilization capacitor required | Reduces BOM count and PCB area; eliminates risk of instability from capacitor ESR/aging |
| Stable with up to 10 µF capacitive loads | Enables fast load transient response in DAC buffer or ADC reference circuits without oscillation |
| Indefinite short-circuit protection | Withstands output-to-GND fault indefinitely at 75 mA limit - prevents latch-up or thermal runaway |
| Low thermal hysteresis (75 ppm) | Minimizes calibration drift after thermal cycling - essential for factory-trimmed industrial sensors |
Applications
| Automotive Sensor Signal Conditioning | Portable Data Acquisition |
|---|---|
|
Use Scenario: Amplifying and digitizing signals from pressure, temperature, or position sensors in engine control units. IC Role / Device Role / Timing Role: Precision 3.3 V reference for 16-bit ADCs and analog front-end gain stages. Use Value: ±0.2% initial accuracy and 75 ppm/°C tempco ensure <±0.05% total error over −40°C to +125°C, meeting ASIL-B functional safety margins. |
Use Scenario: Battery-powered handheld multimeters and environmental monitors requiring multi-hour runtime. IC Role / Device Role / Timing Role: Low-power reference for SAR ADCs and microcontroller internal ADCs. Use Value: 60 µA supply current and 3 µA shutdown mode extend CR2032 battery life beyond 18 months in sleep-wake duty cycles. |
| Industrial Process Controller I/O Modules | Medical Patient Monitoring Front-Ends |
|
Use Scenario: Providing calibrated reference for 4–20 mA transmitter outputs and analog input channel digitization. IC Role / Device Role / Timing Role: Stable 3.3 V reference for precision DACs and isolated sigma-delta ADCs. Use Value: Load regulation ≤120 ppm/mA and line regulation ≤85 ppm/V maintain <0.01% output variation across varying fieldbus power and load conditions. |
Use Scenario: ECG, SpO₂, and blood pressure modules where signal integrity directly impacts diagnostic accuracy. IC Role / Device Role / Timing Role: Ultra-low-noise (310 µVPP) reference for high-resolution medical ADCs. Use Value: 0.1–10 Hz noise performance meets IEC 60601-2-27 requirements for clinical-grade biosignal 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 |
|---|---|---|---|
| REF3333AIDBVR | 3.3 V, ±0.1% initial accuracy, 10 ppm/°C max tempco, 3.9 µA IQ - lower noise (12 µVRMS) but only 5 mA output drive | Better for ultra-low-power sensor nodes with light loads; insufficient for 20 mA DAC buffers | Select REF3333AIDBVR when long-term stability (<15 ppm/1000h) and sub-µA IQ outweigh output current needs |
| MAX6126AASA33+ | 3.3 V, ±0.06% initial accuracy, 3 ppm/°C max tempco, 1.2 mA IQ - higher power, superior precision, SO-8 package | Suitable for lab-grade test equipment; incompatible with space-constrained SOT-23 layouts | Choose MAX6126AASA33+ only when metrology-grade accuracy justifies larger footprint and 20× higher supply current |
Compared with REF3333AIDBVR and MAX6126AASA33+, LM4128BQ1MFX3.3/NOPB uniquely balances AEC-Q100 Grade 1 qualification, 20 mA drive, SOT-23 size, and micropower operation - making it the only drop-in solution for automotive-qualified, medium-current reference designs.
Availability
LM4128BQ1MFX3.3/NOPB is available at Aetrix Electronics and suitable for automotive sensor modules, portable instrumentation, and industrial I/O systems requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4128BQ1MFX3.3/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 leader focused on analog and embedded processing technologies, with decades of expertise in precision analog ICs and automotive-grade reliability.
LM4128BQ1MFX3.3/NOPB belongs to TI's precision voltage reference product line, engineered specifically for high-accuracy, low-power, and AEC-Q100-compliant applications in harsh-environment electronics.
FAQ
What is the maximum load current supported by LM4128BQ1MFX3.3/NOPB?
The LM4128BQ1MFX3.3/NOPB supports up to 20 mA output current while maintaining regulation within specifications. This enables direct driving of precision DACs, op-amp bias networks, and ADC reference inputs without external buffering - verified across −40°C to +125°C with load regulation ≤120 ppm/mA.
Does LM4128BQ1MFX3.3/NOPB require an external input capacitor?
Yes - a minimum 0.1 µF ceramic capacitor (X5R/X7R) is required between VIN and GND for stable operation. The LM4128BQ1MFX3.3/NOPB datasheet specifies CIN ≥ COUT, and recommends 4.7–22 µF for improved noise suppression and startup overshoot control. Omitting CIN risks instability or excessive output ripple.
Is LM4128BQ1MFX3.3/NOPB pin-compatible with other LM4128 variants?
Yes - all LM4128xMFXx.x/NOPB variants share identical 5-pin SOT-23 (DBV) pinout and footprint. The LM4128BQ1MFX3.3/NOPB can be substituted for LM4128AMF-3.3/NOPB or LM4128CMF-3.3/NOPB without layout changes, though grade-dependent parameters (initial accuracy, tempco) differ per part number.
What is the enable logic polarity and voltage threshold for LM4128BQ1MFX3.3/NOPB?
The LM4128BQ1MFX3.3/NOPB features active-high enable: EN must be ≥65% of VIN to activate regulation, and ≤35% of VIN to enter 3–7 µA shutdown mode. With VIN = 5 V, this corresponds to VIH ≥3.25 V and VIL ≤1.75 V - ensuring compatibility with standard 3.3 V and 5 V logic families.
How does LM4128BQ1MFX3.3/NOPB achieve stability without an external compensation capacitor?
The LM4128BQ1MFX3.3/NOPB integrates internal frequency compensation optimized for its band-gap reference core and output stage. This design eliminates need for external capacitors while guaranteeing stability with capacitive loads up to 10 µF - validated across all operating conditions in the official TI datasheet SNVS475E.
LM4128BQ1MFX3.3/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:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°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
LM4128BQ1MFX3.3/NOPB FAQ
1.How can I place an order for LM4128BQ1MFX3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BQ1MFX3.3/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 LM4128BQ1MFX3.3/NOPB reliable?
The price and inventory of LM4128BQ1MFX3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BQ1MFX3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BQ1MFX3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BQ1MFX3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BQ1MFX3.3/NOPB?
LM4128BQ1MFX3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BQ1MFX3.3/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 LM4128BQ1MFX3.3/NOPB?
For technical support, including LM4128BQ1MFX3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BQ1MFX3.3/NOPB requirements.
6.How does Aetrix verify that LM4128BQ1MFX3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BQ1MFX3.3/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 LM4128BQ1MFX3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BQ1MFX3.3/NOPB?
All LM4128BQ1MFX3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BQ1MFX3.3/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 LM4128BQ1MFX3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4128BQ1MFX3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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