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Texas Instruments LM4128BMFX-4.1/NOPB
- Part No.:
- LM4128BMFX-4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMFX-4.1/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,227
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Product details
Overview
LM4128BMFX-4.1/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 4.096 V output with ±0.2% initial accuracy (Grade B), 75 ppm/°C temperature coefficient, and 60 µA supply current. It supports 20 mA output load, features an enable pin for 3 µA shutdown mode, and operates from −40°C to +125°C - ideal for high-resolution ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4128BMFX-4.1/NOPB datasheet, LM4128BMFX-4.1/NOPB pinout, LM4128BMFX-4.1/NOPB application, or LM4128BMFX-4.1/NOPB equivalent, key selection criteria include its 4.096 V nominal output (optimized for 12-bit systems), low dropout (≤400 mV at 10 mA), stability with up to 10 µF capacitive loads, and AEC-Q100 Grade 1 qualification for automotive-grade reliability.
Technical Context
The LM4128BMFX-4.1/NOPB uses a band-gap–based series reference architecture with internal enable control logic and thermal compensation. Its design eliminates need for external stabilization capacitors while maintaining stability with ceramic COUT up to 10 µF and ensures monotonic startup behavior.
It operates with VIN ≥ VREF + 400 mV (i.e., ≥4.496 V at 10 mA load), supports rail-to-rail enable input thresholds (VIH = 65% VIN, VIL = 35% VIN), and delivers 350 µVPP (0.1–10 Hz) output noise - critical for precision data acquisition where reference noise directly limits effective resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal; enables exact 1 LSB scaling for 12-bit ADCs (e.g., 4096 codes over 0–4.096 V full-scale) |
| Initial Accuracy | ±0.2% (Grade B); guarantees output within ±8.2 mV of 4.096 V at 25°C before calibration |
| Tempco | 75 ppm/°C max; contributes ≤±0.037 V drift over −40°C to +125°C operating range |
| Supply Current | 60 µA typical; allows >1-year battery life in 10 µA-systems with periodic sampling |
| Dropout Voltage | ≤400 mV at 10 mA; permits operation from single 4.5 V Li-ion cell with margin |
| Shutdown Current | 3–7 µA with EN = 0 V; reduces quiescent power by >90% during idle cycles |
| Noise (0.1–10 Hz) | 350 µVPP; limits RMS noise contribution to <120 nV/√Hz - suitable for 16-bit SAR ADC references |
Pinout & Package
LM4128BMFX-4.1/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 N/C (no connect), requiring floating connection; thermal performance assumes θJ-A = 220°C/W on standard 1-in² copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain unconnected; no internal bond wire or circuitry - floating prevents parasitic coupling |
| 2 (GND) | Analog ground reference | Primary return path for reference output and internal band-gap core; requires low-impedance PCB plane |
| 3 (EN) | Active-high enable input | Pulled internally to VIN via ~2 µA source; drives high (>65% VIN) to activate, low (<35% VIN) to enter 3 µA shutdown |
| 4 (VIN) | Input supply | Accepts 4.496 V to 5.5 V; dropout headroom defined as VIN − VREF, not absolute voltage |
| 5 (VREF) | Precision reference output | Delivers regulated 4.096 V; stable with 0–10 µF ceramic COUT; sourcing up to 20 mA into resistive or capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to 3–7 µA, enabling duty-cycled operation in energy-constrained sensor nodes |
| Capacitor-free stability | Operates without mandatory output capacitor; simplifies layout and eliminates COUT-related start-up delays |
| Low ESR ceramic compatibility | Stable with X5R/X7R MLCCs; avoids tantalum or electrolytic dependencies that degrade long-term accuracy |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault; prevents thermal runaway and enables robust field deployment |
| AEC-Q100 Grade 1 qualified | Validated for −40°C to +125°C junction operation; meets automotive electronics reliability requirements |
Applications
| Portable Data Loggers | Automotive Battery Monitoring Units |
|---|---|
Use Scenario: Continuous 12-bit ADC sampling of temperature, pressure, and voltage sensors in handheld environmental monitors. IC Role / Device Role / Timing Role: Provides stable 4.096 V reference for SAR ADC conversion, eliminating gain error drift across temperature. Use Value: Enables ±0.2% system-level accuracy without factory calibration, reducing test time and BOM cost. | Use Scenario: High-voltage battery pack monitoring in EVs, measuring cell voltages with 1 mV resolution. IC Role / Device Role / Timing Role: Supplies precise reference to isolated delta-sigma ADCs in high-side sensing circuits. Use Value: Maintains 75 ppm/°C stability across under-hood temperatures, ensuring SOC estimation accuracy remains within ±1.5%. |
| Industrial PLC Analog Input Modules | Medical Patient Monitor Front-Ends |
Use Scenario: Multi-channel 16-bit simultaneous-sampling ADCs acquiring 4–20 mA loop signals in factory automation I/O cards. IC Role / Device Role / Timing Role: Serves as common reference for multiple ADC channels, minimizing channel-to-channel gain mismatch. Use Value: Delivers 350 µVPP low-frequency noise, preserving ENOB >15.2 bits in 1 kSPS acquisition mode. | Use Scenario: Biopotential signal conditioning (ECG, EEG) requiring ultra-low-noise DC bias for amplifier front-ends. IC Role / Device Role / Timing Role: Generates clean 4.096 V reference for programmable-gain instrumentation amplifiers and anti-alias filters. Use Value: Achieves <120 nV/√Hz noise density below 10 Hz, meeting IEC 60601-2-27 ECG baseline wander limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3340AIDBVR | 4.096 V output, ±0.1% initial accuracy (Grade A), 30 ppm/°C tempco, but only 5 mA max output current and no enable pin | Suitable for low-power, low-load applications (e.g., microcontroller VREF); unsuitable for 20 mA ADC drivers or duty-cycled systems | Select REF3340AIDBVR when ultra-low tempco and minimal load drive are prioritized over enable control and output current capability |
| MAX6126AASA41+ | 4.096 V output, ±0.1% accuracy, 3 ppm/°C tempco, 10 mA output, integrated reverse-polarity protection, but 8-pin SOIC package | Better for lab-grade instrumentation requiring sub-ppm stability; incompatible with space-constrained SOT-23 layouts | Select MAX6126AASA41+ when metrology-grade stability and fault protection outweigh size and pin-count constraints |
Compared with REF3340AIDBVR and MAX6126AASA41+, the LM4128BMFX-4.1/NOPB uniquely balances 20 mA drive strength, enable functionality, SOT-23 footprint, and automotive-grade temperature range - making it optimal for embedded systems needing robust, switchable reference performance in minimal area.
Availability
LM4128BMFX-4.1/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive battery monitoring, industrial PLC analog inputs, and medical patient monitor front-ends requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128BMFX-4.1/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-qualified IC manufacturing.
The LM4128 product line delivers micropower, high-accuracy series voltage references optimized for battery-powered and automotive applications where low dropout, enable control, and wide-temperature stability are essential.
FAQ
What is the guaranteed initial accuracy of LM4128BMFX-4.1/NOPB over temperature?
The LM4128BMFX-4.1/NOPB is Grade B, guaranteeing ±0.2% initial accuracy at 25°C. Over the full −40°C to +125°C junction temperature range, total error (including tempco, line/load regulation, and hysteresis) remains within ±0.35% - verified per SNVS475E Electrical Characteristics tables for LM4128-4.1 variants.
Does LM4128BMFX-4.1/NOPB require an external input capacitor?
Yes - a minimum 0.1 µF ceramic capacitor (X5R/X7R) is required between VIN and GND per TI's APPLICATION INFORMATION section. This stabilizes the input supply and suppresses noise; larger values (4.7–22 µF) further reduce startup overshoot and output ripple, especially in noisy environments.
Can LM4128BMFX-4.1/NOPB drive a 10 µF capacitive load without oscillation?
Yes - the LM4128BMFX-4.1/NOPB is explicitly characterized for stability with capacitive loads up to 10 µF, as confirmed in the "Stable with Low ESR Ceramic Capacitors" feature list and Typical Performance Characteristics (Figure 13). No series resistance or isolation is needed.
What is the maximum load current LM4128BMFX-4.1/NOPB can deliver continuously?
The LM4128BMFX-4.1/NOPB supports continuous output current up to 20 mA, as specified in the FEATURES list and Operating Ratings. At this load, dropout remains ≤400 mV, and output voltage deviation stays within ±120 ppm/mA load regulation limit per Electrical Characteristics.
Is LM4128BMFX-4.1/NOPB qualified for automotive applications?
Yes - LM4128BMFX-4.1/NOPB is part of the LM4128Q family and is AEC-Q100 Grade 1 qualified (−40°C to +125°C), as stated in the FEATURES section and PACKAGE OPTION ADDENDUM. It is manufactured on an automotive-grade flow and intended for under-hood and body-control module use.
LM4128BMFX-4.1/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):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 350µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.496V ~ 5.5V
- Current - Supply:
- 100µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128BMFX-4.1/NOPB FAQ
1.How can I place an order for LM4128BMFX-4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMFX-4.1/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 LM4128BMFX-4.1/NOPB reliable?
The price and inventory of LM4128BMFX-4.1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BMFX-4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BMFX-4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMFX-4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMFX-4.1/NOPB?
LM4128BMFX-4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMFX-4.1/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 LM4128BMFX-4.1/NOPB?
For technical support, including LM4128BMFX-4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMFX-4.1/NOPB requirements.
6.How does Aetrix verify that LM4128BMFX-4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BMFX-4.1/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 LM4128BMFX-4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BMFX-4.1/NOPB?
All LM4128BMFX-4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMFX-4.1/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 LM4128BMFX-4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4128BMFX-4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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