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Texas Instruments LM4128AMFX-4.1
- Part No.:
- LM4128AMFX-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMFX-4.1.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,155
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Product details
Overview
LM4128AMFX-4.1 from National Semiconductor is a precision micropower series voltage reference in SOT-23-5 package, delivering 4.096 V output with ±0.1% 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 across −40°C to +125°C - ideal for high-resolution ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4128AMFX-4.1 datasheet, LM4128AMFX-4.1 pinout, LM4128AMFX-4.1 application, or LM4128AMFX-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 Grade 1 qualification availability in automotive variants.
Technical Context
The LM4128AMFX-4.1 uses a band-gap-derived reference core optimized for low-power operation and capacitive-load stability without external compensation. Its enable-controlled series architecture eliminates idle current waste typical of shunt references, enabling efficient battery-powered use.
It achieves stable regulation with input voltages as low as VREF + 400 mV (i.e., ≥4.496 V) and tolerates output capacitance up to 10 µF. The device integrates indefinite short-circuit protection (75 mA limit) and exhibits low thermal hysteresis (75 ppm) over −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal; enables precise 12-bit DAC/ADC full-scale calibration (e.g., 4.096 V = 1 LSB × 2¹²). |
| Initial Accuracy | ±0.1% at 25°C; guarantees ≤±4.1 mV absolute error before temperature or aging effects. |
| Tempco | 75 ppm/°C max; contributes ≤±0.375 mV drift over −40°C to +125°C span (ΔT = 165°C). |
| Quiescent Current | 60 µA typical; allows >1-year runtime on a 200 mAh coin cell under continuous operation. |
| Dropout Voltage | 400 mV max at 10 mA; permits operation from 4.5 V supply in 5 V rail systems with margin. |
| Shutdown Current | 3 µA max; reduces power by 20× during system sleep modes without external circuitry. |
| Noise (0.1–10 Hz) | 350 µVPP; limits RMS noise to ~110 µV, critical for <16-bit measurement resolution. |
Pinout & Package
SOT-23-5 package (NS MF05A), 1.6 mm × 2.9 mm footprint, surface-mount, lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin; must remain unconnected and floating per datasheet specification. |
| 2 | GND | Analog ground reference; requires low-impedance connection to clean system ground plane. |
| 3 | EN | Active-high enable input; driven ≥65% of VIN to activate; ≤35% to enter 3 µA shutdown. |
| 4 | VIN | Input supply; must exceed VREF + 400 mV (≥4.496 V) for regulation; max 5.5 V. |
| 5 | VREF | Precision 4.096 V output; capable of sourcing up to 20 mA; stable with ≤10 µF capacitive load. |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current from 60 µA to 3 µA, enabling ultra-low-power duty-cycled sensing. |
| No external capacitor required | Stable with no output capacitor; eliminates BOM cost and board space for basic applications. |
| Capacitive-load tolerance | Drives up to 10 µF output capacitance - supports fast load transient response in data acquisition. |
| Low dropout voltage | 400 mV max at 10 mA enables use with single-cell Li-ion (3.0–4.2 V) via LDO pre-regulation. |
| AEC-Q100 qualified variants | LM4128AQ1MFX-4.1 available for automotive applications requiring Grade 1 (−40°C to +125°C). |
Applications
| Portable Data Loggers | Industrial PLC Analog Inputs |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature/humidity at 100 Hz with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 4.096 V reference for ADC full-scale range, rejecting supply ripple and thermal drift. Use Value: Enables ±0.5 LSB total unadjusted error (TUE) over temperature, meeting Class A sensor accuracy requirements. |
Use Scenario: Modular I/O card in programmable logic controller acquiring 4–20 mA loop signals via precision resistor and 16-bit ΣΔ ADC. IC Role / Device Role / Timing Role: Supplies excitation reference for current-sense resistor and ADC reference simultaneously. Use Value: Eliminates separate reference ICs; 75 ppm/°C tempco ensures <0.1% gain error drift across industrial temperature range. |
| Medical Patient Monitor Front-End | Automotive Battery Management System |
|
Use Scenario: ECG signal conditioning module digitizing biopotentials with 24-bit ΔΣ ADC and anti-alias filtering. IC Role / Device Role / Timing Role: Precision reference for ADC and programmable gain amplifier offset calibration. Use Value: 350 µVPP low-frequency noise avoids obscuring microvolt-level cardiac waveforms. |
Use Scenario: Cell voltage monitoring IC in 12S Li-ion pack measuring individual 3.0–4.2 V cells with 1 mV resolution. IC Role / Device Role / Timing Role: Reference for 16-bit ADC used in analog front-end; enabled only during measurement bursts. Use Value: 3 µA shutdown current minimizes standby drain; ±0.1% accuracy ensures SOC estimation within ±1.5%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision series voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3040AIDBZR | 4.096 V, ±0.2% initial accuracy, 100 ppm/°C, 50 µA IQ, SOT-23-3 (no EN pin) | Lacks enable control; requires external logic for shutdown; lower accuracy grade | Select when board space is constrained and shutdown capability is handled externally. |
| ADR3440ARJZ-R7 | 4.096 V, ±0.1% initial accuracy, 30 ppm/°C, 120 µA IQ, SOT-23-5 (with EN) | Lower tempco but higher supply current; tighter long-term stability (30 ppm/1k hrs) | Prefer for high-stability metrology where power budget allows +60 µA overhead. |
Compared with LM4128AMFX-4.1, REF3040AIDBZR trades enable functionality and accuracy for smaller footprint and lower cost, while ADR3440ARJZ-R7 improves thermal stability at the expense of quiescent current - making LM4128AMFX-4.1 optimal for battery-constrained, AEC-Q100-aligned designs needing balanced performance.
Availability
LM4128AMFX-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and automotive battery monitoring requiring stable component supply with traceable lot history and extended lifecycle support.
Supply support for LM4128AMFX-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 analog semiconductor company acquired by Texas Instruments in 2011; its precision reference portfolio remains widely deployed in industrial and automotive systems.
The LM4128 family was designed specifically for space-constrained, micropower applications demanding high initial accuracy and low temperature drift - targeting portable test equipment, sensor signal chains, and automotive sub-systems.
FAQ
What is the minimum input voltage required for LM4128AMFX-4.1 to regulate properly?
The LM4128AMFX-4.1 requires VIN ≥ VREF + 400 mV, i.e., ≥4.496 V at 10 mA load. At lighter loads, dropout decreases - e.g., 200 mV at 10 mA for 2.5 V variant - but for LM4128AMFX-4.1, 4.496 V is the guaranteed minimum for full-spec operation across temperature and process variation. Operation below this risks output collapse or increased noise.
Does LM4128AMFX-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 LM4128AMFX-4.1. When an output capacitor is used, CIN must be ≥ COUT; for best noise suppression and startup behavior, 4.7 µF to 22 µF is recommended. Mounting CIN close to pins 4 (VIN) and 2 (GND) minimizes parasitic inductance and improves PSRR.
Can LM4128AMFX-4.1 drive a 10 µF capacitive load without oscillation?
Yes - the LM4128AMFX-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. However, larger COUT increases turn-on time (e.g., 78.8 µs to 90% with 10 µF vs. 33.2 µs with 1 µF), which must be considered in burst-mode applications.
What is the maximum load current LM4128AMFX-4.1 can source continuously?
The LM4128AMFX-4.1 is rated for continuous output current up to 20 mA across −40°C to +125°C. Short-circuit current is limited to 75 mA indefinitely. Derating applies above 25°C ambient: at 85°C, max continuous load drops to ~15 mA due to thermal limits (θJ-A = 220°C/W, TJMAX = 125°C). For 20 mA operation at high temperature, ensure adequate PCB copper area.
Is LM4128AMFX-4.1 pin-compatible with automotive-grade LM4128AQ1MFX-4.1?
Yes - LM4128AMFX-4.1 and LM4128AQ1MFX-4.1 share identical SOT-23-5 pinout, electrical specifications, and marking layout (R5FA vs. R6FA). The AQ1 variant adds AEC-Q100 Grade 1 qualification, enhanced manufacturing controls, and automotive-qualified lot traceability - but requires no PCB or schematic changes for drop-in replacement in qualified designs.
LM4128AMFX-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:
- ±0.1%
- 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
LM4128AMFX-4.1 FAQ
1.How can I place an order for LM4128AMFX-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMFX-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 LM4128AMFX-4.1 reliable?
The price and inventory of LM4128AMFX-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 LM4128AMFX-4.1 is usually 5 days.
3.What payment methods are accepted for LM4128AMFX-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMFX-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AMFX-4.1?
LM4128AMFX-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMFX-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 LM4128AMFX-4.1?
For technical support, including LM4128AMFX-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMFX-4.1 requirements.
6.How does Aetrix verify that LM4128AMFX-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4128AMFX-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 LM4128AMFX-4.1 meets industry standards.
7.What is the process for return or replacement of LM4128AMFX-4.1?
All LM4128AMFX-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMFX-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 LM4128AMFX-4.1 part is unused and in its original packaging.
Return procedure for LM4128AMFX-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128AMFX-4.1 Tags
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