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Texas Instruments LM4128DMFX-3.0
- Part No.:
- LM4128DMFX-3.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DMFX-3.0.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,590
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Product details
Overview
LM4128DMFX-3.0 from Texas Instruments (formerly National Semiconductor) is a precision micropower series voltage reference in SOT-23-5 package, delivering 3.0 V output with ±1.0% initial accuracy, 100 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 medical devices.
For engineers reviewing the LM4128DMFX-3.0 datasheet, LM4128DMFX-3.0 pinout, LM4128DMFX-3.0 application, or LM4128DMFX-3.0 equivalent, key selection considerations include dropout voltage (≤400 mV at 10 mA), stability with capacitive loads up to 10 µF, line regulation (70 ppm/V), load regulation (25–120 ppm/mA), and thermal hysteresis (75 ppm).
Technical Context
The LM4128DMFX-3.0 implements a band-gap-derived series reference architecture with internal enable control logic and short-circuit protection (75 mA limit). Its design eliminates need for external stabilization capacitors while maintaining stability under capacitive loads up to 10 µF.
It operates with input voltage as low as VREF + 400 mV (i.e., ≥3.4 V), supports shutdown via EN pin (VIH ≥ 65% VIN, VIL ≤ 35% VIN), and delivers 3.0 V output with long-term stability of 50 ppm over 1000 hours and 0.1–10 Hz noise of 285 µVPP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V nominal, ±1.0% initial accuracy at 25°C - ensures ADC/DAC reference compliance within 1 LSB for 8-bit systems |
| Temperature Coefficient | 100 ppm/°C max (−40°C to +125°C) - limits drift to ±0.36 mV/°C across full range |
| Quiescent Current | 60 µA typical - enables multi-year operation on coin-cell batteries in always-on sensor nodes |
| Dropout Voltage | 400 mV max at 10 mA load - allows use with low-headroom LDOs or single-cell Li-ion (3.0–4.2 V) |
| Enable Shutdown Current | 3–7 µA - reduces system standby power by >95% vs active mode |
| Load Regulation | 25–120 ppm/mA - maintains <±0.36 mV error from 0 to 20 mA load variation |
| Output Noise (0.1–10 Hz) | 285 µVPP - suitable for 12-bit precision data acquisition without additional filtering |
Pinout & Package
SOT-23-5 package (NS package number MF05A), 1.6 mm × 2.9 mm footprint, 1.1 mm height, gull-wing leads. RoHS-compliant, Pb-free plating.
| 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 PCB ground plane |
| 3 | EN | Active-high enable input; pulls up internally (~2 µA); drives high to activate reference output |
| 4 | VIN | Input supply rail; must be ≥3.4 V (VREF + 400 mV) for full-load operation |
| 5 | VREF | Stable 3.0 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 ≤7 µA - extends battery life in intermittent-sampling applications |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault; recovers automatically when short removed |
| Low thermal hysteresis | 75 ppm - minimizes calibration drift after thermal cycling in industrial environments |
| Wide junction temperature range | −40°C to +125°C - qualified for under-hood automotive and factory-floor industrial use |
Applications
| Portable Battery-Powered Instrumentation | Precision Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with 12-bit SAR ADC requiring stable 3.0 V reference across battery discharge (3.6 V → 2.8 V). IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and internal LDO feedback. Use Value: 400 mV dropout enables operation down to 3.4 V input; 60 µA IQ extends alkaline battery life beyond 2 years in sleep mode. |
Use Scenario: Industrial PLC analog input module measuring 4–20 mA loop sensors with 0.1% accuracy requirement. IC Role / Device Role / Timing Role: Precision reference for 16-bit sigma-delta ADC and isolated DAC calibration. Use Value: 100 ppm/°C tempco and 75 ppm thermal hysteresis ensure <±0.05% total error across −25°C to +70°C operating range. |
| Automotive Body Control Modules | Medical Patient Monitoring Sensors |
Use Scenario: AEC-Q100-compliant BCM measuring battery voltage, cabin temperature, and door position using microcontroller ADC. IC Role / Device Role / Timing Role: System-level reference for MCU internal ADC and external analog front-end. Use Value: D-grade LM4128DMFX-3.0 meets cost-sensitive automotive qualification (−40°C to +125°C TJ, 1000-hr reliability test). |
Use Scenario: Wearable ECG patch with ultra-low-power MCU and 12-bit ADC sampling biopotential signals. IC Role / Device Role / Timing Role: Low-noise reference source for analog signal conditioning and digitization. Use Value: 285 µVPP (0.1–10 Hz) noise avoids degradation of microvolt-level ECG signal integrity; 3 µA shutdown enables multi-week runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AUT30+ | 0.06% initial accuracy, 3 ppm/°C tempco, 1.2 µA IQ - higher precision but 3× cost and no enable pin | Used in metrology-grade equipment where 12+ bit accuracy is mandatory | Select for lab-grade instruments; avoid when shutdown control or cost sensitivity is critical |
| REF3030AIDBZR | 0.2% initial accuracy, 50 ppm/°C tempco, 50 µA IQ, SOT-23-3 - no enable pin, lower grade than LM4128D but smaller footprint | Preferred in space-constrained consumer IoT nodes where 10-bit ADC suffices | Choose for minimal board area; reject if shutdown capability or automotive temp range required |
Compared with MAX6126AUT30+ and REF3030AIDBZR, the LM4128DMFX-3.0 uniquely balances shutdown control, automotive-grade temperature range, and D-grade cost efficiency - making it optimal for mid-tier industrial and automotive sensing where 1% accuracy and 3 µA standby are design requirements.
Availability
LM4128DMFX-3.0 is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, and automotive body control modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128DMFX-3.0 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 legacy support for its precision analog portfolio, including voltage references, op-amps, and data converters.
The LM4128 series was designed specifically for space-constrained, battery-operated systems needing micropower operation, low dropout, and robust thermal performance - targeting instrumentation, medical, and automotive applications.
FAQ
What is the minimum input voltage required for stable operation of the LM4128DMFX-3.0?
The LM4128DMFX-3.0 requires VIN ≥ VREF + 400 mV = 3.4 V for full-load operation at 10 mA. At lighter loads, it may function down to ~3.1 V, but guaranteed performance (including dropout and regulation) begins at 3.4 V. Input below this threshold risks output collapse or increased noise in the LM4128DMFX-3.0.
Does the LM4128DMFX-3.0 require an external output capacitor?
No - the LM4128DMFX-3.0 is stable without an output capacitor and supports optional COUT up to 10 µF for improved load transient response. An input capacitor (≥0.1 µF ceramic) is mandatory; CIN must be ≥ COUT if used. This eliminates BOM overhead while enabling flexible layout in the LM4128DMFX-3.0 design.
How does the enable pin (EN) function on the LM4128DMFX-3.0?
The EN pin on the LM4128DMFX-3.0 is active-high with internal ~2 µA pull-up. Driving EN ≥ 65% of VIN activates the reference; pulling EN ≤ 35% of VIN places LM4128DMFX-3.0 in shutdown (IQ ≤ 7 µA). Leaving EN floating defaults to enabled state. EN must never exceed VIN to avoid damage.
What is the thermal hysteresis specification for the LM4128DMFX-3.0?
The LM4128DMFX-3.0 exhibits 75 ppm thermal hysteresis over −40°C to +125°C cycling - meaning the 3.0 V output shifts by ≤225 µV upon returning to 25°C after extreme temperature exposure. This value is guaranteed for D-grade parts and directly impacts recalibration frequency in field-deployed LM4128DMFX-3.0 systems.
Can the LM4128DMFX-3.0 drive a 20 mA load continuously?
Yes - the LM4128DMFX-3.0 is rated for continuous 20 mA output current with guaranteed load regulation (25–120 ppm/mA). However, power dissipation must be checked: at 20 mA and 3.4 V input, PD ≈ (3.4 V − 3.0 V) × 20 mA = 8 mW - well below the 350 mW SOT-23-5 limit, ensuring safe operation in the LM4128DMFX-3.0.
LM4128DMFX-3.0 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):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 285µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3.4V ~ 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
LM4128DMFX-3.0 FAQ
1.How can I place an order for LM4128DMFX-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DMFX-3.0 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 LM4128DMFX-3.0 reliable?
The price and inventory of LM4128DMFX-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128DMFX-3.0 is usually 5 days.
3.What payment methods are accepted for LM4128DMFX-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DMFX-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DMFX-3.0?
LM4128DMFX-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DMFX-3.0 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 LM4128DMFX-3.0?
For technical support, including LM4128DMFX-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DMFX-3.0 requirements.
6.How does Aetrix verify that LM4128DMFX-3.0 is sourced from the original manufacturer or authorized distributors?
All LM4128DMFX-3.0 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 LM4128DMFX-3.0 meets industry standards.
7.What is the process for return or replacement of LM4128DMFX-3.0?
All LM4128DMFX-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DMFX-3.0, 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 LM4128DMFX-3.0 part is unused and in its original packaging.
Return procedure for LM4128DMFX-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128DMFX-3.0 Tags
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