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Texas Instruments LM4128BMFX-4.1
- Part No.:
- LM4128BMFX-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMFX-4.1.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,803
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Product details
Overview
LM4128BMFX-4.1 from Texas Instruments (formerly 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 and supports up to 20 mA load current - ideal for high-resolution ADC/DAC biasing in portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the LM4128BMFX-4.1 datasheet, LM4128BMFX-4.1 pinout, LM4128BMFX-4.1 application, or LM4128BMFX-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), 0.1–10 Hz noise (350 µVPP), and thermal hysteresis (75 ppm) across −40°C to +125°C.
Technical Context
The LM4128BMFX-4.1 uses a band-gap-derived reference core optimized for micropower operation and low thermal drift. Its internal enable circuitry includes a 2 µA pull-up, allowing direct connection to VIN or external logic control without external components.
Designed as a series reference, it eliminates need for external stabilization capacitors while maintaining stability with capacitive loads up to 10 µF. Input voltage range is VREF + 400 mV to 5.5 V, supporting operation from single Li-ion cells or regulated 5 V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal - matches common 12-bit DAC/ADC full-scale reference points. |
| Initial Accuracy | ±0.2% at 25°C - enables 11-bit effective resolution without calibration. |
| Tempco | 75 ppm/°C max - ensures ≤±0.41% drift over −40°C to +125°C junction range. |
| Quiescent Current | 60 µA typical - extends battery life in always-on sensor nodes. |
| 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 input with margin. |
| Noise (0.1–10 Hz) | 350 µVPP - limits RMS noise contribution to <1 LSB in 16-bit systems. |
Pinout & Package
SOT-23-5 package (NS package number MF05A), 1.6 mm × 2.9 mm footprint, 1.1 mm height, lead pitch 0.95 mm. RoHS-compliant, Pb-free terminations.
| 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 - drives high (>65% VIN) to activate; pulls low (<35% VIN) to enter 3 µA shutdown. |
| 4 | VIN | Input supply - accepts 4.496 V to 5.5 V (VREF + 400 mV min to 5.5 V max). |
| 5 | VREF | Precision output - delivers regulated 4.096 V; stable with 0–10 µF capacitive loads. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates stably without output capacitor - simplifies layout and reduces BOM count. |
| Low ESR ceramic compatibility | Stable with X5R/X7R MLCCs - avoids tantalum or electrolytic dependencies. |
| Indefinite short-circuit protection | Limits output current to 75 mA - prevents damage during test or fault conditions. |
| Thermal hysteresis | 75 ppm - minimizes repeatability error after thermal cycling in field-deployed equipment. |
| Long-term stability | 50 ppm over 1000 hours - reduces calibration frequency in metrology-grade instruments. |
Applications
| Portable Data Loggers | Industrial PLC Analog Inputs |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 1-second intervals for 6 months. IC Role / Device Role / Timing Role: Provides stable 4.096 V reference for 16-bit SAR ADC, enabling ±0.5°C temperature resolution. Use Value: 60 µA quiescent current and 3 µA shutdown extend coin-cell life beyond 18 months; 75 ppm/°C tempco maintains accuracy across outdoor temperature swings. |
Use Scenario: Modular I/O card in programmable logic controller measuring 4–20 mA loop signals with 0.1% total uncertainty. IC Role / Device Role / Timing Role: Precision reference for isolated ΣΔ ADC front-end, rejecting supply ripple and thermal drift. Use Value: 100 ppm/V line regulation and 120 ppm/mA load regulation ensure consistent gain across varying field transmitter loads and rail voltages. |
| Medical Patient Monitors | Battery Management Systems |
Use Scenario: Portable ECG module digitizing biopotential signals with 1 µV resolution and clinical-grade accuracy. IC Role / Device Role / Timing Role: Low-noise (350 µVPP) reference for instrumentation amplifier gain-setting and ADC conversion. Use Value: 0.1–10 Hz noise performance directly limits baseline wander and improves SNR in sub-Hz physiological bands. |
Use Scenario: Cell voltage monitoring in 4S Li-ion pack with coulomb counting and state-of-charge estimation. IC Role / Device Role / Timing Role: Reference for 12-bit ADC measuring individual cell voltages (0–4.2 V range) with 1 mV resolution. Use Value: ±0.2% initial accuracy and 50 ppm long-term stability reduce SoC drift to <1.5% over 12 months of operation. |
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 | 4.096 V, ±0.2% accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-3 (no EN pin) | No enable function; fixed output; lower tempco but higher cost | Select when shutdown control is unnecessary and lowest possible drift is prioritized. |
| ADR3440ARJZ-R7 | 4.096 V, ±0.1% accuracy, 10 ppm/°C, 120 µA IQ, SOT-23-5 (with EN) | Higher precision and lower tempco, but doubles quiescent current | Select for lab-grade instrumentation where power budget allows >100 µA continuous draw. |
Compared with LM4128BMFX-4.1, REF3040AIDBZR offers better drift but lacks enable control and requires board redesign due to 3-pin SOT-23; ADR3440ARJZ-R7 provides superior accuracy and stability at the cost of 2× quiescent current - making LM4128BMFX-4.1 optimal for space-constrained, battery-sensitive designs needing balanced performance.
Availability
LM4128BMFX-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, and medical sensor modules requiring stable component supply with guaranteed long-term availability and automotive-grade traceability options.
Supply support for LM4128BMFX-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
Texas Instruments acquired National Semiconductor in 2011 and maintains full product support, qualification, and documentation for the LM4128 family. TI is a global leader in analog and embedded processing semiconductors.
The LM4128 series was designed for high-accuracy, low-power reference needs in space-constrained, battery-operated, and thermally demanding applications - emphasizing micropower efficiency, robustness across automotive temperature ranges, and ease of integration.
FAQ
What is the minimum input voltage required for stable operation of the LM4128BMFX-4.1?
The LM4128BMFX-4.1 requires VIN ≥ VREF + 400 mV = 4.496 V for stable regulation at full load (10 mA). Below this threshold, output voltage drops nonlinearly; operation down to 4.496 V is guaranteed per datasheet specifications. At light loads, marginally lower inputs may sustain regulation but are not characterized or recommended.
Does the LM4128BMFX-4.1 require an input capacitor, and if so, what value is recommended?
Yes - a minimum 0.1 µF ceramic (X5R/X7R) input capacitor is mandatory for stable operation of the LM4128BMFX-4.1. When an output capacitor is used, CIN must be ≥ COUT. For optimal noise suppression and startup behavior, 4.7 µF to 22 µF input capacitance is recommended, placed as close as possible to the VIN and GND pins.
Can the LM4128BMFX-4.1 drive a 10 µF capacitive load without oscillation?
Yes - the LM4128BMFX-4.1 is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, including low-ESR ceramic types. This eliminates need for isolation resistors or damping networks, simplifying design for fast load-transient response in ADC reference applications.
What is the maximum load current supported by the LM4128BMFX-4.1, and how does it affect accuracy?
The LM4128BMFX-4.1 supports up to 20 mA output current. Load regulation is specified as 25–120 ppm/mA, meaning a 20 mA load shift introduces up to 2.4 mV (≈±0.059%) error in the 4.096 V output. For highest accuracy, keep load currents ≤5 mA or compensate in firmware using measured load-regulation coefficient.
How does the enable pin (EN) of the LM4128BMFX-4.1 interface with standard logic families?
The EN pin of the LM4128BMFX-4.1 has TTL-compatible thresholds: VIH ≥ 65% VIN (e.g., ≥3.25 V at VIN = 5 V) and VIL ≤ 35% VIN (e.g., ≤1.75 V). It includes a 2 µA internal pull-up, so leaving EN unconnected defaults the device to active mode - no external pull-up resistor is needed unless interfacing with open-drain logic.
LM4128BMFX-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
LM4128BMFX-4.1 FAQ
1.How can I place an order for LM4128BMFX-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMFX-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 LM4128BMFX-4.1 reliable?
The price and inventory of LM4128BMFX-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 LM4128BMFX-4.1 is usually 5 days.
3.What payment methods are accepted for LM4128BMFX-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMFX-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMFX-4.1?
LM4128BMFX-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMFX-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 LM4128BMFX-4.1?
For technical support, including LM4128BMFX-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMFX-4.1 requirements.
6.How does Aetrix verify that LM4128BMFX-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4128BMFX-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 LM4128BMFX-4.1 meets industry standards.
7.What is the process for return or replacement of LM4128BMFX-4.1?
All LM4128BMFX-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMFX-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 LM4128BMFX-4.1 part is unused and in its original packaging.
Return procedure for LM4128BMFX-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128BMFX-4.1 Tags
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