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Texas Instruments LM4128CMFX-3.0
- Part No.:
- LM4128CMFX-3.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMFX-3.0.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,575
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Product details
Overview
LM4128CMFX-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 ±0.5% 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 current, and operates from −40°C to +125°C - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128CMFX-3.0 datasheet, LM4128CMFX-3.0 pinout, LM4128CMFX-3.0 application, or LM4128CMFX-3.0 equivalent, key selection considerations include its 3.0 V fixed output, low dropout (400 mV at 10 mA), stability with capacitive loads up to 10 µF, absence of required external stabilization capacitor, and C-grade performance trade-offs between accuracy and cost in space-constrained designs.
Technical Context
The LM4128CMFX-3.0 uses a band-gap–derived reference core optimized for micropower operation, with internal circuitry eliminating need for external stabilization capacitors while maintaining stability under capacitive loads ≤10 µF. Its enable-controlled architecture allows seamless integration into power-gated subsystems.
It operates as a series reference with VIN ≥ VREF + 400 mV (i.e., ≥3.4 V at 10 mA load), delivers 3.0 V output with guaranteed line regulation (70 ppm/V) and load regulation (25–120 ppm/mA), and features indefinite short-circuit protection limiting output current to 75 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V nominal, ±0.5% initial accuracy at 25°C - ensures ≤±15 mV absolute error before calibration. |
| Temperature Coefficient | 100 ppm/°C max over −40°C to +125°C - contributes ≤±300 µV/°C drift, critical for wide-temperature industrial sensing. |
| Quiescent Current | 60 µA typical - enables multi-year battery life in always-on sensor nodes drawing <100 µA system current. |
| Shutdown Current | 3 µA max when EN = 0 V - reduces standby power by >95% versus active mode, essential for duty-cycled measurement systems. |
| Dropout Voltage | 400 mV max at 10 mA load - allows operation from 3.4 V supply, compatible with single-cell LiFePO₄ or dual-cell alkaline sources. |
| Output Noise | 285 µVPP (0.1–10 Hz) - supports 16-bit ADC accuracy without additional filtering in precision analog front-ends. |
| Load Current Capability | 20 mA max - sufficient to drive ADC references, op-amp bias networks, and small DACs without external buffering. |
Pinout & Package
SOT-23-5 package (NS package number MF05A), 1.6 mm × 2.9 mm footprint, 1.1 mm height, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin; must remain unconnected and floating per design - no routing or soldering allowed. |
| 2 | GND | Analog ground reference; requires low-impedance connection to system AGND plane to minimize noise coupling. |
| 3 | EN | Active-high enable input; driven high (>65% VIN) to activate reference, low (<35% VIN) to enter 3 µA shutdown state. |
| 4 | VIN | Input supply rail; must be ≥3.4 V (VREF + 400 mV) for full-load operation and stable regulation. |
| 5 | VREF | Precision 3.0 V output; capable of sourcing up to 20 mA with <120 ppm/mA load regulation - suitable for direct ADC reference or biasing. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates stably without mandatory output capacitor and supports up to 10 µF capacitive loads - eliminates BOM item and layout area in compact designs. |
| Micropower operation | 60 µA supply current enables integration into energy-harvesting or coin-cell–powered devices where average current budget is sub-100 µA. |
| Enable-controlled shutdown | 3 µA shutdown current via EN pin allows precise power sequencing and extends battery life in intermittent-sampling applications. |
| Low thermal hysteresis | 75 ppm max hysteresis over −40°C to +125°C cycling - preserves calibration integrity in thermally cycled industrial enclosures. |
| Robust short-circuit protection | Indefinite 75 mA current limit prevents damage during test fixture miswiring or PCB assembly faults. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and pressure every 10 seconds using a 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 3.0 V reference for ADC conversion and microcontroller VREF, enabling ±0.0075% full-scale accuracy. Use Value: 60 µA quiescent current and 3 µA shutdown extend CR2032 battery life beyond 3 years; SOT-23-5 footprint minimizes PCB area in sealed IP67 housing. |
Use Scenario: 4–20 mA loop-powered transmitter for pressure sensing in oil & gas field instruments operating from −40°C to +85°C. IC Role / Device Role / Timing Role: Supplies precision 3.0 V reference to signal conditioning amplifier and DAC, ensuring loop current accuracy across temperature. Use Value: 100 ppm/°C tempco and 75 ppm thermal hysteresis maintain <0.1% span error over lifetime; rugged SOT-23-5 withstands mechanical stress in vibration-prone installations. |
| Medical Point-of-Care Devices | Automotive Body Control Modules |
Use Scenario: Handheld blood glucose meter requiring FDA-grade accuracy and single AAA battery operation for >1000 tests. IC Role / Device Role / Timing Role: References 12-bit ADC measuring electrochemical sensor current, with enable pin synchronized to test cycle to minimize power. Use Value: 285 µVPP low-frequency noise avoids digitization errors; ±0.5% initial accuracy eliminates factory trim step, reducing manufacturing cost. |
Use Scenario: Interior lighting control module in passenger vehicles, monitoring ambient light and dimming LEDs based on CAN bus commands. IC Role / Device Role / Timing Role: Supplies 3.0 V reference to ambient light sensor ADC and microcontroller analog peripherals in AEC-Q100–compliant design. Use Value: C-grade LM4128CMFX-3.0 balances cost and performance for non-safety-critical functions; −40°C to +125°C rating meets automotive under-hood 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, lower tempco, higher accuracy grade. | Requires external enable circuitry if shutdown needed; better suited for high-accuracy, low-drift applications where board space permits larger tolerance stack-up. | Select REF3030AIDBZR when long-term stability (<20 ppm/1000h) and tighter tempco outweigh need for integrated enable control. |
| MAX6029AEUR+T | 3.0 V, ±0.2% initial accuracy, 75 ppm/°C, 35 µA IQ, SOT-23-3 - no enable, lower IQ, higher PSRR (80 dB @ 1 kHz). | Lacks shutdown capability; superior power supply rejection improves noise immunity in noisy automotive or industrial supply rails. | Choose MAX6029AEUR+T for ultra-low-power, noise-sensitive applications where enable functionality is handled externally or not required. |
Compared with REF3030AIDBZR and MAX6029AEUR+T, the LM4128CMFX-3.0 uniquely integrates enable control in a C-grade 3.0 V reference at minimal cost premium, trading 0.3% initial accuracy and higher tempco for system-level simplification in battery-constrained designs requiring dynamic power gating.
Availability
LM4128CMFX-3.0 is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor transmitters, automotive body electronics, and battery-powered data loggers requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4128CMFX-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 legacy product lines including precision analog ICs. TI is a global leader in analog and embedded processing, with broad portfolio spanning power management, signal chain, and interface solutions.
The LM4128 series belongs to TI's precision voltage reference product line, designed specifically for space-constrained, low-power applications demanding stable reference performance across industrial and automotive temperature ranges without external compensation components.
FAQ
What is the maximum input voltage for LM4128CMFX-3.0?
The LM4128CMFX-3.0 has an absolute maximum input voltage of 6 V, but its recommended operating maximum is 5.5 V. Operation above 5.5 V risks exceeding absolute maximum ratings and may cause permanent damage. For reliable regulation, VIN must also be ≥3.4 V (VREF + 400 mV) to maintain dropout margin at full 20 mA load - the LM4128CMFX-3.0 will not regulate properly below this threshold.
Does LM4128CMFX-3.0 require an external output capacitor?
No, the LM4128CMFX-3.0 is designed to operate stably without an external output capacitor and is certified stable with capacitive loads up to 10 µF. An output capacitor is optional and used only to improve load transient response - for example, adding a 1 µF ceramic capacitor between VREF and GND reduces overshoot when switching from 1 mA to 20 mA load. The input capacitor (CIN ≥ 0.1 µF) remains mandatory for stability.
What does the 'C' in LM4128CMFX-3.0 signify?
The 'C' in LM4128CMFX-3.0 denotes the accuracy and temperature coefficient grade: ±0.5% initial accuracy at 25°C and 100 ppm/°C maximum temperature coefficient over −40°C to +125°C. This grade offers a balance of performance and cost for industrial applications where A-grade (±0.1%, 75 ppm/°C) is unnecessary but D-grade (±1.0%, 100 ppm/°C) lacks sufficient accuracy for 12–14 bit systems.
Can LM4128CMFX-3.0 drive a 20 kΩ load directly?
Yes - a 20 kΩ load draws only 150 µA (3.0 V ÷ 20 kΩ) from the LM4128CMFX-3.0, well within its 20 mA output capability. At this load, output voltage deviation due to load regulation is ≤3 ppm (0.009 mV), negligible for most applications. However, ensure the input supply remains ≥3.4 V to maintain regulation margin, especially at elevated temperatures where dropout increases.
Is LM4128CMFX-3.0 qualified for automotive use?
No - LM4128CMFX-3.0 is the commercial-grade variant. Automotive-qualified equivalents are designated with 'Q' suffixes (e.g., LM4128CQ1MFX3.0), which undergo AEC-Q100 Grade 1 qualification (−40°C to +125°C), enhanced manufacturing controls, and automotive-specific reliability testing. The LM4128CMFX-3.0 is rated for −40°C to +125°C junction temperature but lacks formal automotive qualification documentation and process flow validation.
LM4128CMFX-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:
- ±0.5%
- 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
LM4128CMFX-3.0 FAQ
1.How can I place an order for LM4128CMFX-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMFX-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 LM4128CMFX-3.0 reliable?
The price and inventory of LM4128CMFX-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 LM4128CMFX-3.0 is usually 5 days.
3.What payment methods are accepted for LM4128CMFX-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMFX-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMFX-3.0?
LM4128CMFX-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMFX-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 LM4128CMFX-3.0?
For technical support, including LM4128CMFX-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMFX-3.0 requirements.
6.How does Aetrix verify that LM4128CMFX-3.0 is sourced from the original manufacturer or authorized distributors?
All LM4128CMFX-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 LM4128CMFX-3.0 meets industry standards.
7.What is the process for return or replacement of LM4128CMFX-3.0?
All LM4128CMFX-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMFX-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 LM4128CMFX-3.0 part is unused and in its original packaging.
Return procedure for LM4128CMFX-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128CMFX-3.0 Tags
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