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Texas Instruments LM4128BMFX-3.0
- Part No.:
- LM4128BMFX-3.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMFX-3.0.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,806
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Product details
Overview
LM4128BMFX-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 ±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 battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128BMFX-3.0 datasheet, LM4128BMFX-3.0 pinout, LM4128BMFX-3.0 application, or LM4128BMFX-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 LM4128BMFX-3.0 employs a band-gap-derived reference core optimized for low-power operation and minimal thermal drift. Its series architecture eliminates need for external stabilization capacitors while maintaining stability with ceramic output capacitance up to 10 µF.
It integrates an enable input (EN) referenced to VIN, with defined logic thresholds (VIL ≤ 35% VIN, VIH ≥ 65% VIN), and delivers regulated 3.0 V output across −40°C to +125°C junction temperature range. Dropout is specified as 175–400 mV at 10 mA load, supporting operation from VIN = 3.4 V to 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V nominal, ±0.2% initial accuracy at 25°C (B grade) |
| Temperature Coefficient | 75 ppm/°C max over −40°C to +125°C - ensures < ±240 µV drift across full range |
| Quiescent Current | 60 µA typical - enables multi-year battery life in low-duty-cycle sensing nodes |
| Shutdown Current | 3–7 µA with EN = 0 V - allows deep sleep state in portable systems |
| Dropout Voltage | 175–400 mV at 10 mA load - supports operation from 3.4 V input in 3.3 V rail systems |
| Output Noise (0.1–10 Hz) | 285 µVPP - suitable for 12-bit to 14-bit ADC reference without additional filtering |
| Line Regulation | 70 ppm/V - limits output variation to < ±210 µV per volt input change |
| Load Regulation | 25–120 ppm/mA - maintains stability under dynamic load steps up to 20 mA |
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, surface-mountable with standard reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect terminal - must remain unconnected and floating |
| 2 | GND | Analog ground reference - requires low-impedance connection to system ground plane |
| 3 | EN | Active-high enable input - pulled internally to VIN; drives device into 3 µA shutdown when < 35% VIN |
| 4 | VIN | Input supply - must exceed VREF + 400 mV (≥3.4 V for 3.0 V output) and stay ≤5.5 V |
| 5 | VREF | Precision 3.0 V output - capable of sourcing up to 20 mA; stable with 0–10 µF ceramic capacitive load |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to ≤7 µA - extends battery life in intermittent-sampling applications |
| Capacitor-free stability | Operates stably without mandatory output capacitor - simplifies layout and reduces BOM count |
| Low thermal hysteresis | 75 ppm - minimizes repeatability error after thermal cycling in field-deployed equipment |
| Indefinite short-circuit protection | Limits output current to 75 mA - prevents damage during test or fault conditions |
| Wide temperature operation | −40°C to +125°C junction range - qualified for automotive and industrial ambient environments |
Applications
| Portable Data Loggers | Battery-Powered Sensors |
|---|---|
Use Scenario: Continuous 12-bit ADC sampling in remote environmental monitors powered by coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Precision 3.0 V reference for SAR ADC conversion, enabling < ±1 LSB error across temperature. Use Value: 60 µA quiescent current and 3 µA shutdown extend operational lifetime beyond 5 years on single battery charge. |
Use Scenario: Wireless IoT node measuring temperature, humidity, and pressure with periodic BLE transmission. IC Role / Device Role / Timing Role: Stable reference for sensor signal conditioning and ADC, synchronized with microcontroller wake-up cycles. Use Value: Enable pin allows full power-down between measurements, reducing average current to sub-µA levels. |
| Industrial Process Transmitters | Automotive Body Control Modules |
Use Scenario: 4–20 mA loop-powered transmitter in factory automation, operating from 12–24 V supply with local 3.3 V regulation. IC Role / Device Role / Timing Role: Reference for DAC generating precise loop current, requiring long-term stability and low tempco. Use Value: 50 ppm long-term stability (1000 hrs) and 75 ppm/°C tempco ensure calibration holdover >12 months in unattended installations. |
Use Scenario: Cabin temperature sensor interface in AEC-Q100-compliant body control unit, exposed to −40°C cold cranking and 125°C under-hood conditions. IC Role / Device Role / Timing Role: Voltage reference for analog front-end amplifying thermistor signals prior to MCU ADC sampling. Use Value: −40°C to +125°C operation and AEC-Q100 Grade 1 qualification (via LM4128BQ variant) meet automotive reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3030AIDBZR | 3.0 V, ±0.2% initial accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-3, no enable pin | Fixed 3-pin configuration - simpler layout but lacks shutdown control | Select when board space is constrained and shutdown not required |
| ADR3430ARJZ-R7 | 3.0 V, ±0.1% initial accuracy, 10 ppm/°C, 120 µA IQ, SOT-23-5, no enable pin | Higher precision and lower tempco, but higher supply current and no enable function | Select when ultra-low drift dominates over power budget and enable functionality |
Compared with REF3030AIDBZR and ADR3430ARJZ-R7, the LM4128BMFX-3.0 uniquely combines B-grade accuracy, enable-controlled shutdown, and SOT-23-5 pinout-making it optimal for space-constrained, battery-aware designs needing active power management without sacrificing stability.
Availability
LM4128BMFX-3.0 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensors, and industrial process transmitters requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4128BMFX-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 its precision analog portfolio, including voltage references, with focus on high-reliability, low-power, and automotive-qualified components.
The LM4128 series was designed for space-constrained, micropower applications demanding high initial accuracy and low temperature drift-especially in portable, battery-operated, and automotive-grade measurement systems.
FAQ
What is the minimum input voltage required for stable operation of the LM4128BMFX-3.0?
The LM4128BMFX-3.0 requires VIN ≥ VREF + 400 mV, i.e., ≥3.4 V at 10 mA load. At lighter loads, dropout decreases; the absolute minimum is 3.4 V for guaranteed 3.0 V output within specification. Operation below this threshold risks output collapse or increased noise and drift. The LM4128BMFX-3.0 is not functional below 3.4 V input under rated load conditions.
Does the LM4128BMFX-3.0 require an external output capacitor?
No, the LM4128BMFX-3.0 is stable without an output capacitor and is certified for use with capacitive loads up to 10 µF. An output capacitor (e.g., 1 µF ceramic) is optional but recommended to improve load transient response-especially when switching between light and heavy loads. The LM4128BMFX-3.0 does require a minimum 0.1 µF input capacitor (CIN ≥ COUT) for stability.
How does the enable pin (EN) function on the LM4128BMFX-3.0?
The EN pin on the LM4128BMFX-3.0 is active-high with internal pull-up (~2 µA). When EN ≥ 65% of VIN, the device operates normally; when EN ≤ 35% of VIN, it enters shutdown mode drawing ≤7 µA. Leaving EN unconnected defaults to enabled state via internal pull-up. The LM4128BMFX-3.0 must never be driven with EN > VIN, as that violates absolute maximum ratings.
What is the output noise performance of the LM4128BMFX-3.0, and how does it impact ADC accuracy?
The LM4128BMFX-3.0 delivers 285 µVPP integrated noise over 0.1–10 Hz - equivalent to ~1.5 LSB for a 12-bit 3.0 V ADC (LSB = 732 µV). This makes it suitable for 12-bit precision without external filtering. For 14-bit systems (LSB = 183 µV), noise may contribute measurable error; in such cases, adding a 10 nF ceramic capacitor at the VREF pin reduces low-frequency noise further. The LM4128BMFX-3.0 noise spec is measured under standard conditions (VIN = 5 V, ILOAD = 0 A).
Is the LM4128BMFX-3.0 qualified for automotive applications?
The LM4128BMFX-3.0 itself is not AEC-Q100 qualified; however, its automotive-grade counterpart LM4128BQ1MFX3.0 is AEC-Q100 Grade 1 qualified and manufactured on automotive flow. Both share identical electrical specs and SOT-23-5 packaging, but only the Q-suffix variant undergoes enhanced defect screening and reliability testing per AEC-Q100. For automotive designs, LM4128BQ1MFX3.0-not LM4128BMFX-3.0-is the compliant option.
LM4128BMFX-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:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°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
LM4128BMFX-3.0 FAQ
1.How can I place an order for LM4128BMFX-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMFX-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 LM4128BMFX-3.0 reliable?
The price and inventory of LM4128BMFX-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 LM4128BMFX-3.0 is usually 5 days.
3.What payment methods are accepted for LM4128BMFX-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMFX-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMFX-3.0?
LM4128BMFX-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMFX-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 LM4128BMFX-3.0?
For technical support, including LM4128BMFX-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMFX-3.0 requirements.
6.How does Aetrix verify that LM4128BMFX-3.0 is sourced from the original manufacturer or authorized distributors?
All LM4128BMFX-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 LM4128BMFX-3.0 meets industry standards.
7.What is the process for return or replacement of LM4128BMFX-3.0?
All LM4128BMFX-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMFX-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 LM4128BMFX-3.0 part is unused and in its original packaging.
Return procedure for LM4128BMFX-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128BMFX-3.0 Tags
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