My Inquiry
My Account
Texas Instruments LM4128BMF-4.1
- Part No.:
- LM4128BMF-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMF-4.1.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,604
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4128BMF-4.1 from National Semiconductor is a precision micropower series voltage reference in SOT-23-5 package, delivering 4.096 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 high-accuracy ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4128BMF-4.1 datasheet, LM4128BMF-4.1 pinout, LM4128BMF-4.1 application, or LM4128BMF-4.1 equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), line regulation (100 ppm/V), load regulation (25–120 ppm/mA), noise performance (350 µVPP, 0.1–10 Hz), and AEC-Q100-compatibility readiness via BQ-grade variants.
Technical Context
The LM4128BMF-4.1 uses a band-gap-derived reference core optimized for low-power, low-dropout operation. Its series architecture eliminates need for external stabilization capacitors while maintaining stability with capacitive loads up to 10 µF - enabling direct drive of SAR ADC reference inputs without buffering.
It integrates an internal enable control path with 35% VIN low-level threshold and 65% VIN high-level threshold, allowing seamless integration into battery-powered systems requiring dynamic power gating. Dropout voltage remains ≤400 mV across full 0–20 mA load range and −40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal; enables precise 12-bit full-scale alignment with common ADCs (e.g., 4.096 V = 1 LSB = 1 mV for 12-bit) |
| Initial Accuracy | ±0.2% at 25°C; guarantees ≤±8.2 mV absolute error before calibration |
| Tempco | 75 ppm/°C max; contributes ≤±0.375 mV drift over −40°C to +85°C ambient |
| Quiescent Current | 60 µA typical; supports >1-year battery life in 10 µA sleep-cycle systems |
| Shutdown Current | 3 µA max; reduces system standby power by >95% vs active mode |
| Dropout Voltage | 400 mV max at 10 mA; allows operation from 4.5 V supply with 4.096 V output |
| Noise (0.1–10 Hz) | 350 µVPP; limits RMS noise contribution to <120 µV in precision 16-bit data acquisition |
Pinout & Package
SOT-23-5 package (NS package number MF05A), surface-mount, 1.6 mm × 2.8 mm footprint, 1.1 mm height. RoHS-compliant, rated for −40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect; must remain floating - not tied to GND or VIN |
| 2 | GND | Analog ground reference; requires low-impedance connection to system AGND plane |
| 3 | EN | Active-high enable input; pulls up internally (~2 µA); drives high to activate reference output |
| 4 | VIN | Input supply rail; must exceed VREF + 400 mV (≥4.496 V) for full-load operation |
| 5 | VREF | Precision 4.096 V output; capable of sourcing up to 20 mA with <120 ppm/mA load regulation |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates stably without mandatory output capacitor; supports optional COUT up to 10 µF for improved transient response |
| Micropower shutdown | Reduces supply current to 3 µA max when EN = 0 V - critical for energy harvesting and coin-cell applications |
| Low-noise reference core | 350 µVPP (0.1–10 Hz) enables <16-bit effective resolution in DC-coupled measurement front-ends |
| Wide input range | Accepts VIN from 4.496 V to 5.5 V - compatible with single-cell Li-ion (4.2 V fully charged) + LDO or 5 V rail |
| Robust thermal hysteresis | 75 ppm max over −40°C to +125°C cycling - ensures repeatability in industrial temperature cycling tests |
Applications
| Portable Data Loggers | Automotive Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node sampling temperature, humidity, and pressure at 1 Hz with 16-bit ADC. IC Role / Device Role / Timing Role: Provides stable 4.096 V reference for ADC conversion, eliminating ratiometric errors from supply variation. Use Value: Enables ±0.2% absolute accuracy over temperature without calibration, extending field calibration interval to 2+ years. |
Use Scenario: Engine control unit measuring throttle position and manifold absolute pressure using analog sensors. IC Role / Device Role / Timing Role: Supplies precision bias to op-amp signal conditioning stages and ADC reference input in ASIL-B subsystems. Use Value: Meets AEC-Q100 Grade 1 requirements when used as LM4128BQ1MF-4.1; supports −40°C cold-crank startup. |
| Medical Patient Monitor Front-End | Industrial PLC Analog Input Module |
|
Use Scenario: Portable ECG device digitizing biopotential signals with 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Delivers ultra-low-noise 4.096 V reference to ADC's VREF pin, minimizing quantization uncertainty. Use Value: 350 µVPP noise ensures <1 LSB noise floor in 24-bit conversion at 1 kSPS, meeting IEC 60601-2-27 immunity thresholds. |
Use Scenario: DIN-rail mounted PLC acquiring 4–20 mA loop signals via precision shunt and 16-bit ADC. IC Role / Device Role / Timing Role: Serves as stable reference for both current-to-voltage conversion gain setting and ADC full-scale definition. Use Value: 75 ppm/°C tempco and 50 ppm long-term stability ensure <0.1% total error over 10-year product lifetime without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3040AIDBZR | Fixed 4.096 V, ±0.2% initial accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-3 (no EN pin) | No enable function; requires external logic for shutdown; lower noise (25 µVRMS) but no programmable enable | Select when board space is constrained and shutdown is managed externally; verify layout compatibility with 3-pin footprint |
| ADR3440ARJZ-R7 | 4.096 V, ±0.1% initial accuracy, 30 ppm/°C, 120 µA IQ, SOT-23-5 (with EN), higher grade stability | Higher accuracy and lower tempco, but 2× quiescent current; automotive qualified (AEC-Q100 Grade 2) | Choose for metrology-grade systems where 0.1% accuracy and 30 ppm/°C outweigh 60 µA vs 120 µA trade-off |
Compared with REF3040AIDBZR and ADR3440ARJZ-R7, LM4128BMF-4.1 uniquely balances micropower shutdown (3 µA), SOT-23-5 pin compatibility, and B-grade precision at lower cost - making it optimal for cost-sensitive, battery-operated industrial sensors where 0.2% accuracy suffices.
Availability
LM4128BMF-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, medical monitoring devices, and industrial PLC analog input circuits requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4128BMF-4.1 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
National Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by Texas Instruments in 2011. Its voltage reference portfolio emphasized precision, low power, and robustness for mission-critical systems.
The LM4128 family was designed for space-constrained, battery-powered applications demanding high initial accuracy, low tempco, and micropower shutdown - targeting instrumentation, test equipment, and automotive electronics before TI's integration.
FAQ
What is the maximum input voltage for LM4128BMF-4.1?
The absolute maximum input voltage for LM4128BMF-4.1 is 6 V, but the recommended operating maximum is 5.5 V. Exceeding 5.5 V risks exceeding the 350 mW power dissipation limit at elevated temperatures, especially in the SOT-23-5 package with θJ-A = 220°C/W. For reliable operation at full load and high ambient, keep VIN ≤ 5.5 V.
Does LM4128BMF-4.1 require an input capacitor?
Yes - LM4128BMF-4.1 requires a minimum 0.1 µF ceramic input capacitor (X5R/X7R) between VIN and GND. If an output capacitor is used, CIN must be ≥ COUT. This capacitor ensures stability during line transients and suppresses supply noise that would otherwise modulate the 4.096 V reference output.
Can LM4128BMF-4.1 drive a 10 µF capacitive load directly?
Yes - LM4128BMF-4.1 is explicitly characterized for stability with capacitive loads up to 10 µF, including low-ESR ceramic types. This capability eliminates the need for external isolation resistors or buffers when driving ADC reference inputs or sample-and-hold circuits with large hold capacitors.
What is the turn-on time of LM4128BMF-4.1 under typical conditions?
LM4128BMF-4.1 has a typical turn-on time of 33.2 µs when driving a 1 µF load and 78.8 µs with a 10 µF load. Under brown-out conditions (<4.5 V VIN) or at −40°C, turn-on time may extend up to 10 ms. Enable pin must be driven high ≥100 ns before VIN reaches regulation to ensure monotonic startup.
Is LM4128BMF-4.1 qualified for automotive applications?
The base LM4128BMF-4.1 is not AEC-Q100 qualified, but its automotive-grade variant LM4128BQ1MF-4.1 is AEC-Q100 Grade 1 qualified and manufactured on an enhanced automotive flow. Both share identical electrical specs, but only the Q1 version includes extended reliability testing, defect detection, and traceability required for automotive ECUs.
LM4128BMF-4.1 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):
- 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
LM4128BMF-4.1 FAQ
1.How can I place an order for LM4128BMF-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMF-4.1 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 LM4128BMF-4.1 reliable?
The price and inventory of LM4128BMF-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BMF-4.1 is usually 5 days.
3.What payment methods are accepted for LM4128BMF-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMF-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMF-4.1?
LM4128BMF-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMF-4.1 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 LM4128BMF-4.1?
For technical support, including LM4128BMF-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMF-4.1 requirements.
6.How does Aetrix verify that LM4128BMF-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4128BMF-4.1 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 LM4128BMF-4.1 meets industry standards.
7.What is the process for return or replacement of LM4128BMF-4.1?
All LM4128BMF-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMF-4.1, 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 LM4128BMF-4.1 part is unused and in its original packaging.
Return procedure for LM4128BMF-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128BMF-4.1 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…
