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Texas Instruments LM4128CMFX-4.1/NOPB
- Part No.:
- LM4128CMFX-4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMFX-4.1/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,929
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Product details
Overview
LM4128CMFX-4.1/NOPB from Texas Instruments is a precision micropower series voltage reference delivering 4.096 V output with ±0.5% initial accuracy (C grade), 100 ppm/°C max temperature coefficient, 60 µA supply current, and 400 mV dropout at 10 mA - designed for high-accuracy ADC/DAC biasing in portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the LM4128CMFX-4.1/NOPB datasheet, LM4128CMFX-4.1/NOPB pinout, LM4128CMFX-4.1/NOPB application, or LM4128CMFX-4.1/NOPB equivalent, key selection criteria include guaranteed 4.096 V output stability over −40°C to +125°C, enable-controlled 3 µA shutdown mode, no external capacitor requirement for stability, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4128CMFX-4.1/NOPB implements a band-gap-based series voltage reference architecture with internal enable logic, supporting operation from VIN = VREF + 400 mV (≥4.496 V) up to 5.5 V. Its design eliminates need for external stabilization capacitors while maintaining stability with capacitive loads ≤10 µF.
It features indefinite short-circuit protection (75 mA limit), thermal hysteresis of 75 ppm, long-term stability of 50 ppm over 1000 hours, and line/load regulation specified as 100 ppm/V and 25–120 ppm/mA respectively - enabling reliable use in precision analog signal chains where reference drift directly impacts measurement fidelity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal; enables direct interface with 12-bit ADCs (1 LSB = 1 mV) without scaling. |
| Initial Accuracy | ±0.5% (C grade); ensures ≤±20.5 mV absolute error at 25°C for calibration-critical applications. |
| Tempco | 100 ppm/°C max; contributes ≤±12 mV drift over −40°C to +125°C operating range. |
| Supply Current | 60 µA typical; supports >1-year battery life in 10 µA-sleep IoT sensor nodes. |
| Shutdown Current | 3–7 µA with EN = 0 V; allows dynamic power gating in multi-channel DAQ systems. |
| Dropout Voltage | 400 mV at 10 mA; permits operation from single-cell Li-ion (3.0–4.2 V) with margin. |
| Noise (0.1–10 Hz) | 350 µVPP; limits RMS noise contribution to <1.2 µV in precision 24-bit sigma-delta ADC front-ends. |
Pinout & Package
LM4128CMFX-4.1/NOPB uses a 5-pin SOT-23 (DBV) package with exposed pad not electrically connected. Pin 1 is NC (no connect), requiring floating connection per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No-connect terminal | Must remain unconnected; solder mask coverage recommended to prevent accidental shorts. |
| 2 (GND) | Analog ground reference | Low-impedance return path for reference output; requires dedicated ground plane tie-in. |
| 3 (EN) | Enable control input | Active-high logic; VIH ≥65% VIN, VIL ≤35% VIN; internal 2 µA pull-up allows direct VIN tie if always enabled. |
| 4 (VIN) | Input supply rail | Accepts 4.496–5.5 V; must exceed VREF by ≥400 mV to maintain regulation at full load. |
| 5 (VREF) | Precision reference output | 4.096 V source capable of sourcing up to 20 mA; stable with 0–10 µF capacitive loads. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor stability | Operates stably without COUT - reduces BOM count and board area in ultra-compact designs. |
| Capacitive load drive | Supports up to 10 µF output capacitance - improves transient response in multiplexed ADC sampling. |
| Indefinite short-circuit protection | Self-limits output to 75 mA during fault - prevents thermal runaway and enables robust field deployment. |
| Low ESR ceramic capacitor compatibility | Stable with X5R/X7R dielectrics - avoids tantalum or electrolytic dependencies in high-reliability systems. |
| −40°C to +125°C operation | Specified performance across full automotive-grade junction range - suitable for under-hood and industrial environments. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitoring node acquiring temperature, humidity, and pressure with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC VREF input and DAC biasing in analog front-end. Use Value: 4.096 V output matches 16-bit full-scale range (65536 steps × 62.5 µV/step); ±0.5% accuracy ensures <±327 LSB total unadjusted error before calibration. |
Use Scenario: 4–20 mA loop-powered transmitter conditioning RTD and thermocouple signals in factory automation. IC Role / Device Role / Timing Role: Stable excitation reference for ratiometric bridge measurements and ADC reference in isolated signal chain. Use Value: 100 ppm/°C tempco limits gain drift to <±1.6 LSB over ambient range; 60 µA quiescent current minimizes loop power burden. |
| Medical Patient Monitors | Test & Measurement Equipment |
Use Scenario: Portable ECG device digitizing biopotential signals using low-noise instrumentation amplifier and 24-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Low-noise reference source for ADC and PGA gain-setting resistors. Use Value: 350 µVPP (0.1–10 Hz) noise contributes <0.5 µV RMS error - preserves sub-microvolt signal integrity in differential biosensing. |
Use Scenario: Benchtop multimeter performing 6½-digit DC voltage measurements with auto-ranging and calibration routines. IC Role / Device Role / Timing Role: Primary reference for internal DMM ADC and as traceable calibration standard during self-test. Use Value: 50 ppm long-term stability over 1000 hrs ensures calibration validity between annual metrology lab audits. |
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% initial accuracy (A grade), 50 ppm/°C, 50 µA IQ, SOT-23-5 | Higher accuracy and lower tempco, but no enable pin - requires external FET for shutdown control. | Select when tighter initial tolerance and lower drift outweigh need for integrated enable functionality. |
| ADR3440ARJZ-R7 | 4.096 V, ±0.1% initial accuracy (A grade), 30 ppm/°C, 120 µA IQ, SOT-23-5 | Superior tempco and accuracy, but higher supply current and no shutdown mode - unsuitable for ultra-low-power wake-on-event designs. | Select when ultimate stability dominates power budget constraints, e.g., laboratory-grade instruments. |
Compared with LM4128CMFX-4.1/NOPB, REF3040AIDBZR offers better accuracy without enable control, while ADR3440ARJZ-R7 delivers superior drift performance at double the quiescent current - making LM4128CMFX-4.1/NOPB the optimal balance of precision, micropower operation, and integrated enable for portable and industrial DAQ systems.
Availability
LM4128CMFX-4.1/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical patient monitors requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LM4128CMFX-4.1/NOPB 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 is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and broad industrial portfolio coverage.
The LM4128 product line delivers micropower, high-accuracy series voltage references for space-constrained, battery-operated, and high-reliability applications - targeting instrumentation, test equipment, and automotive-grade sensing systems.
FAQ
What is the output voltage tolerance of LM4128CMFX-4.1/NOPB over temperature?
The LM4128CMFX-4.1/NOPB has a maximum temperature coefficient of 100 ppm/°C over −40°C to +125°C, resulting in ≤±12 mV total drift relative to its 4.096 V nominal output. This is specified for the C grade and confirmed across the full operating junction temperature range in the official SNVS475E datasheet.
Does LM4128CMFX-4.1/NOPB require an external output capacitor?
No, LM4128CMFX-4.1/NOPB is stable without an external output capacitor and remains stable with capacitive loads up to 10 µF. An output capacitor is optional and used only to improve load transient response - it is not required for basic regulation or stability per TI's application guidance.
What is the minimum input voltage required for LM4128CMFX-4.1/NOPB to regulate properly?
The LM4128CMFX-4.1/NOPB requires VIN ≥ VREF + 400 mV = 4.496 V at 10 mA load to maintain regulation within specifications. At lighter loads, dropout decreases - e.g., 175 mV typical at 10 mA for 4.096 V version - but 4.496 V is the guaranteed minimum for full-load operation.
How does the enable pin (EN) function on LM4128CMFX-4.1/NOPB?
The EN pin on LM4128CMFX-4.1/NOPB is active-high with VIH ≥65% VIN and VIL ≤35% VIN. When pulled low, it places LM4128CMFX-4.1/NOPB in shutdown mode drawing 3–7 µA. Internal 2 µA pull-up allows direct connection to VIN for always-on operation without external components.
Is LM4128CMFX-4.1/NOPB qualified for automotive applications?
No, LM4128CMFX-4.1/NOPB is not AEC-Q100 qualified. The automotive-grade variants are designated LM4128AQ/BQ/CQ/DQ (e.g., LM4128CQMF-4.1/NOPB). LM4128CMFX-4.1/NOPB is rated for −40°C to +125°C operation but lacks automotive flow qualification and associated reliability testing.
LM4128CMFX-4.1/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°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
LM4128CMFX-4.1/NOPB FAQ
1.How can I place an order for LM4128CMFX-4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMFX-4.1/NOPB 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-4.1/NOPB reliable?
The price and inventory of LM4128CMFX-4.1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CMFX-4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CMFX-4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMFX-4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMFX-4.1/NOPB?
LM4128CMFX-4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMFX-4.1/NOPB 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-4.1/NOPB?
For technical support, including LM4128CMFX-4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMFX-4.1/NOPB requirements.
6.How does Aetrix verify that LM4128CMFX-4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CMFX-4.1/NOPB 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-4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CMFX-4.1/NOPB?
All LM4128CMFX-4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMFX-4.1/NOPB, 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-4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4128CMFX-4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128CMFX-4.1/NOPB Tags
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