My Inquiry
My Account
Texas Instruments LM4128BMFX-2.0
- Part No.:
- LM4128BMFX-2.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMFX-2.0.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,947
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4128BMFX-2.0 from Texas Instruments (formerly National Semiconductor) is a precision micropower series voltage reference in SOT-23-5 package, delivering 2.048 V output with ±0.2% initial accuracy, 75 ppm/°C temperature coefficient, and 60 µA quiescent 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 portable data acquisition.
For engineers reviewing the LM4128BMFX-2.0 datasheet, LM4128BMFX-2.0 pinout, LM4128BMFX-2.0 application, or LM4128BMFX-2.0 equivalent, key selection considerations include its low dropout (400 mV max), stability with capacitive loads up to 10 µF, absence of required external stabilization capacitor, and grade-B performance trade-off between cost and precision in space-constrained analog signal chains.
Technical Context
The LM4128BMFX-2.0 implements a band-gap-derived series reference architecture with internal enable logic and short-circuit protection. Its design eliminates need for external stabilization capacitors while maintaining stability under capacitive loads ≤10 µF and ensuring <0.5% output deviation across input voltage range (VREF + 400 mV to 5.5 V).
It uses a dedicated EN pin with 35–65% VIN threshold for controlled power-up/down, draws only 60 µA during operation and drops to 3–7 µA in shutdown, and achieves thermal hysteresis of ≤75 ppm over −40°C to +125°C - enabling reliable use in automotive-grade and industrial environments where supply headroom and long-term drift are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal; matches common 12-bit DAC/ADC full-scale reference points. |
| Initial Accuracy | ±0.2% at 25°C; ensures ≤±4.1 mV absolute error before calibration. |
| Tempco | 75 ppm/°C max; contributes ≤±15.9 mV drift over −40°C to +125°C span. |
| Quiescent Current | 60 µA typical; enables >1-year battery life in 10 µA-sleep microcontroller systems. |
| Dropout Voltage | 400 mV max at 10 mA; allows operation from 2.45 V supply in Li-ion or dual-cell alkaline systems. |
| Shutdown Current | 3–7 µA; reduces system standby power by >95% vs active mode. |
| Load Capability | 20 mA max; drives ADC reference inputs, op-amp bias networks, and small DAC buffers directly. |
Pinout & Package
SOT-23-5 package (NS package number MF05A), 1.6 mm × 2.8 mm footprint, 1.1 mm height, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin; must remain unconnected and floating per datasheet. |
| 2 | GND | Analog ground reference; requires low-impedance connection to system AGND plane. |
| 3 | EN | Active-high enable input; pulls up internally (~2 µA); driven high ≥65% VIN to activate. |
| 4 | VIN | Input supply rail; must exceed VREF + 400 mV and stay ≤5.5 V for regulation. |
| 5 | VREF | Precision 2.048 V output; connects directly to ADC reference, sensor excitation, or feedback node. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates without mandatory output capacitor; stable with 0–10 µF ceramic loads. |
| Micropower operation | 60 µA supply current enables multi-year coin-cell operation in portable sensors. |
| Enable-controlled shutdown | Reduces current to 3–7 µA, supporting dynamic power gating in firmware-controlled systems. |
| Low thermal hysteresis | ≤75 ppm ensures repeatable output after thermal cycling - critical for field-calibrated test gear. |
| Indefinite short-circuit protection | Limits output to 75 mA during fault; survives accidental GND shorts without damage. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring node sampling temperature/humidity at 1 Hz using 12-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 2.048 V reference for ADC conversion, eliminating ratiometric errors from supply variation. Use Value: Enables ±0.2% measurement accuracy over −25°C to +70°C ambient with no recalibration, extending field deployment intervals. |
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART digital overlay. IC Role / Device Role / Timing Role: Supplies precision reference for DAC generating analog output and for internal sensor signal conditioning. Use Value: Maintains 0.1% total unadjusted error (TUE) across full industrial temperature range (−40°C to +85°C) despite limited PCB area. |
| Automotive Cabin Sensors | Medical Point-of-Care Devices |
|
Use Scenario: Occupant detection module using capacitive sensing and low-power MCU in vehicle seat. IC Role / Device Role / Timing Role: Powers reference input of delta-sigma ADC measuring capacitance shifts; enabled only during measurement bursts. Use Value: Achieves AEC-Q100 Grade 1 compliance via B-grade variant; 3 µA shutdown cuts average current to <1 µA between samples. |
Use Scenario: Handheld blood glucose meter with electrochemical strip interface and LCD display. IC Role / Device Role / Timing Role: Sets accurate 2.048 V bias for transimpedance amplifier converting nanoamp-level strip current. Use Value: ±0.2% initial tolerance and 75 ppm/°C tempco ensure <±2 mg/dL glucose reading error across clinical operating range (10°C–40°C). |
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 EN pin) | Fixed 3-pin configuration; lacks enable control and requires external bypass cap for stability | Choose when board space is tighter and shutdown control is unnecessary; lower tempco but no power gating |
| MAX6029BASA20+ | 2.048 V, ±0.2% initial accuracy, 75 ppm/°C, 65 µA IQ, SO-8 (larger footprint) | SO-8 package; higher ESD rating (4 kV HBM); includes trim pin for post-package calibration | Prefer for high-reliability industrial systems requiring field-trimmable references and robust handling |
Compared with REF3020AIDBZR and MAX6029BASA20+, the LM4128BMFX-2.0 uniquely combines enable functionality, capacitor-free stability, and SOT-23-5 packaging - making it optimal for ultra-low-power, space-constrained designs where dynamic power control and layout simplicity are prioritized over lowest possible tempco or post-production trimming.
Availability
LM4128BMFX-2.0 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and automotive cabin electronics requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4128BMFX-2.0 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 acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for legacy precision analog products including the LM4128 family.
The LM4128 series was designed specifically for micropower, space-constrained precision reference applications in battery-operated and automotive-grade systems - emphasizing low dropout, enable control, and robust thermal performance without external compensation.
FAQ
What is the maximum input voltage for LM4128BMFX-2.0?
The LM4128BMFX-2.0 supports a maximum input voltage of 5.5 V. Operation above this level risks permanent damage. For reliable regulation, VIN must be ≥ VREF + 400 mV (i.e., ≥2.448 V at 25°C), and the device remains functional across the full −40°C to +125°C junction temperature range within these limits.
Does LM4128BMFX-2.0 require an external output capacitor?
No, the LM4128BMFX-2.0 is designed to operate stably without an external output capacitor and remains stable with capacitive loads up to 10 µF. An output capacitor is optional and used only to improve load transient response - not for basic regulation stability - distinguishing it from many older reference ICs that mandate minimum COUT.
What is the function of Pin 1 (N/C) on LM4128BMFX-2.0?
Pin 1 of the LM4128BMFX-2.0 is a no-connect (N/C) terminal. It is electrically isolated inside the die and must remain unconnected and floating on the PCB. Soldering or routing to this pin may introduce parasitic coupling or mechanical stress affecting output voltage stability and long-term drift.
How does the enable pin (Pin 3) behave on LM4128BMFX-2.0?
The enable pin (Pin 3) of LM4128BMFX-2.0 is active-high with internal ~2 µA pull-up. It activates the reference when voltage exceeds 65% of VIN and disables it below 35% of VIN. When left floating, the internal pull-up ensures default operation; tying it to VIN guarantees activation, while grounding places LM4128BMFX-2.0 in 3–7 µA shutdown mode.
Is LM4128BMFX-2.0 qualified for automotive applications?
The LM4128BMFX-2.0 itself is not AEC-Q100 qualified; only variants with "Q" suffix (e.g., LM4128BQ1MFX2.0) carry AEC-Q100 Grade 1 qualification. However, LM4128BMFX-2.0 shares identical electrical specifications, SOT-23-5 packaging, and −40°C to +125°C operating range - making it suitable for non-safety-critical automotive cabin electronics where full qualification is not mandated.
LM4128BMFX-2.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128BMFX-2.0 FAQ
1.How can I place an order for LM4128BMFX-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMFX-2.0 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-2.0 reliable?
The price and inventory of LM4128BMFX-2.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BMFX-2.0 is usually 5 days.
3.What payment methods are accepted for LM4128BMFX-2.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMFX-2.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMFX-2.0?
LM4128BMFX-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMFX-2.0 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-2.0?
For technical support, including LM4128BMFX-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMFX-2.0 requirements.
6.How does Aetrix verify that LM4128BMFX-2.0 is sourced from the original manufacturer or authorized distributors?
All LM4128BMFX-2.0 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-2.0 meets industry standards.
7.What is the process for return or replacement of LM4128BMFX-2.0?
All LM4128BMFX-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMFX-2.0, 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-2.0 part is unused and in its original packaging.
Return procedure for LM4128BMFX-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128BMFX-2.0 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
