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Texas Instruments LM4128CMFX-1.8/NOPB
- Part No.:
- LM4128CMFX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMFX-1.8/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,270
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Product details
Overview
LM4128CMFX-1.8/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 1.8 V output with ±0.5% initial accuracy (C grade), 100 ppm/°C max temperature coefficient, and 60 µA supply current. It supports 20 mA output current, features an enable pin for 3–7 µA shutdown mode, and operates from −40°C to +125°C - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128CMFX-1.8/NOPB datasheet, LM4128CMFX-1.8/NOPB pinout, LM4128CMFX-1.8/NOPB application, or LM4128CMFX-1.8/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), load regulation (≤120 ppm/mA), line regulation (≤30 ppm/V), low-noise performance (170 µVPP, 0.1–10 Hz), and stability with up to 10 µF capacitive loads without external compensation.
Technical Context
The LM4128CMFX-1.8/NOPB uses a band-gap-derived reference core optimized for micropower operation and low thermal drift. Its internal architecture eliminates need for external stabilization capacitors while maintaining stability with capacitive loads up to 10 µF - enabled by robust phase margin design and low-output-impedance buffer.
It integrates an enable input (EN) referenced to VIN, with VIH ≥65% VIN and VIL ≤35% VIN, allowing direct logic-level control. The no-connect (N/C) pin simplifies layout in space-constrained designs, and the device achieves 75 ppm/°C typical tempco in A-grade variants - though the C-grade variant (LM4128CMFX-1.8/NOPB) is specified at 100 ppm/°C max over −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.5% initial accuracy (C grade) - ensures stable ADC/DAC biasing within 9 mV tolerance at 25°C. |
| Temperature Coefficient | 100 ppm/°C max (−40°C to +125°C) - corresponds to ±21.6 µV/°C drift, critical for precision sensor signal chains. |
| Supply Current | 60 µA typical, ≤100 µA max - enables multi-year battery life in always-on IoT sensors and portable meters. |
| Dropout Voltage | 400 mV max at 10 mA load - allows operation from 2.2 V supply, compatible with single-cell Li-ion or two-cell alkaline systems. |
| Output Noise | 170 µVPP (0.1–10 Hz) - supports 16-bit+ resolution in low-frequency measurement applications without post-filtering. |
| Enable Shutdown Current | 3–7 µA - reduces system standby power by >90% vs active mode, essential for duty-cycled sensing nodes. |
| Load Regulation | 120 ppm/mA max - maintains output stability across 0–20 mA load range, suitable for driving op-amp references or SAR ADCs. |
Pinout & Package
LM4128CMFX-1.8/NOPB is housed in a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, 2.9 mm × 1.6 mm footprint, and exposed pad optional for thermal enhancement. Pin 1 is N/C (no connect); pins are arranged top-view as: 1=N/C, 2=GND, 3=EN, 4=VIN, 5=VREF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must be left floating; no internal connection - eliminates routing complexity and avoids unintended parasitic coupling. |
| Pin 2 (GND) | Analog ground reference | Primary return path for reference core and output buffer; requires low-impedance PCB plane connection to minimize noise injection. |
| Pin 3 (EN) | Active-high enable input | Controls internal reference activation; VIH ≥65% VIN ensures compatibility with 1.8 V/3.3 V logic without level shifters. |
| Pin 4 (VIN) | Input supply rail | Accepts 2.2 V to 5.5 V (VREF + 400 mV min); internal LDO-like regulation enables clean reference despite noisy supply rails. |
| Pin 5 (VREF) | Precision output terminal | Delivers regulated 1.8 V; stable with 0–10 µF capacitive loads and capable of sourcing up to 20 mA into resistive or mixed R+C loads. |
Key Features
| Feature | Design Value |
|---|---|
| Zero external capacitor requirement | Stable operation without COUT; only CIN ≥0.1 µF required - reduces BOM count and PCB area in ultra-compact designs. |
| Indefinite short-circuit protection | Current-limited to 75 mA during output fault - prevents damage during test, debug, or accidental miswiring in field-deployed equipment. |
| Low ESR ceramic capacitor compatibility | Validated with X5R/X7R dielectrics - enables use of small, high-reliability MLCCs instead of bulkier tantalum or electrolytic types. |
| Wide junction temperature range | −40°C to +125°C operation - qualified for under-hood automotive, industrial motor drives, and outdoor telecom infrastructure. |
| Programmable enable interface | EN pin referenced to VIN (not VREF) - simplifies control logic integration in systems where VIN is the dominant supply domain. |
Applications
| Portable Data Acquisition | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Handheld multimeter measuring DC voltage with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 1.8 V reference for ADC full-scale calibration and offset nulling. Use Value: ±0.5% initial accuracy and 100 ppm/°C tempco ensure <±1 LSB error across operating temperature, eliminating field recalibration. |
Use Scenario: Wireless sensor node logging temperature and pressure using low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Supplies precision bias to op-amps and ADC reference input during active measurement cycles. Use Value: 60 µA quiescent current extends coin-cell battery life beyond 5 years in 1-minute sampling intervals. |
| Industrial Process Control | Automotive Body Electronics |
Use Scenario: 4–20 mA transmitter module converting sensor output to current loop signal. IC Role / Device Role / Timing Role: Sets accurate 1.8 V reference for DAC-based current source control and loop compliance monitoring. Use Value: Load regulation ≤120 ppm/mA ensures consistent loop current accuracy despite varying cable resistance and supply ripple. |
Use Scenario: In-cabin ambient light sensor with auto-dimming display controller. IC Role / Device Role / Timing Role: Supplies reference to photodiode transimpedance amplifier and ADC in infotainment head unit. Use Value: −40°C to +125°C rating and AEC-Q100-compliant LM4128Q family lineage support reliable operation in extreme cabin environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6029ASA18+T | 1.8 V, ±0.2% initial accuracy (A grade), 50 ppm/°C max, 35 µA supply current, SC70-5 package | Lower quiescent current and tighter accuracy, but lower 10 mA max output current and no enable pin | Select when ultra-low power dominates over output drive capability and shutdown control is handled externally. |
| REF3018AIDBZR | 1.8 V, ±0.2% initial accuracy, 50 ppm/°C max, 50 µA supply current, SOT-23-3 (no EN pin) | 3-pin package, no enable function, higher 25 mA output current, but less flexible for power-gated systems | Choose when board space is constrained and enable functionality is unnecessary - avoids unused pin routing. |
Compared with LM4128CMFX-1.8/NOPB, MAX6029ASA18+T offers superior accuracy and lower IQ but sacrifices output drive and shutdown control; REF3018AIDBZR provides higher output current in a smaller 3-pin footprint but removes system-level power management via enable.
Availability
LM4128CMFX-1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial sensor transmitters requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM4128CMFX-1.8/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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision analog ICs and industrial-grade reliability.
The LM4128 series was designed specifically for space-constrained, battery-operated systems needing high-accuracy, low-drift voltage references - targeting instrumentation, portable test gear, and automotive subsystems where micropower and thermal stability are critical.
FAQ
What is the maximum input voltage for LM4128CMFX-1.8/NOPB?
The absolute maximum input voltage for LM4128CMFX-1.8/NOPB is 6 V, but the recommended operating maximum is 5.5 V per the Electrical Characteristics table. Exceeding 5.5 V risks violating the Absolute Maximum Ratings and may degrade long-term reliability or cause permanent damage. Always maintain VIN ≤5.5 V in normal operation.
Does LM4128CMFX-1.8/NOPB require an output capacitor?
No, LM4128CMFX-1.8/NOPB is internally compensated and stable without an output capacitor. A COUT is optional and improves load transient response - especially when switching between light and heavy loads - but is not required for stability. If used, values up to 10 µF are supported with low-ESR ceramic types.
What does the 'C' in LM4128CMFX-1.8/NOPB indicate?
The 'C' denotes the accuracy grade: LM4128CMFX-1.8/NOPB is rated for ±0.5% initial output voltage accuracy at 25°C, with a maximum temperature coefficient of 100 ppm/°C over −40°C to +125°C. This distinguishes it from A-grade (±0.1%), B-grade (±0.2%), and D-grade (±1.0%) variants in the same family.
Can LM4128CMFX-1.8/NOPB drive a 10 kΩ load at full accuracy?
Yes. With 20 mA maximum output current and load regulation of ≤120 ppm/mA, LM4128CMFX-1.8/NOPB delivers 1.8 V ±0.5% into a 10 kΩ load (180 µA), well within its specification limits. Output deviation remains below 22 ppm - far less than the ±0.5% (9 mV) initial tolerance - ensuring full-grade accuracy is maintained.
Is LM4128CMFX-1.8/NOPB RoHS compliant and lead-free?
Yes, LM4128CMFX-1.8/NOPB is RoHS compliant and lead-free. Per TI's Packaging Information, the part carries "Yes" in the RoHS column and uses Sn (tin) lead finish. It meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) with unlimited floor life at ≤30°C/85% RH.
LM4128CMFX-1.8/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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 170µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.2V ~ 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-1.8/NOPB FAQ
1.How can I place an order for LM4128CMFX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMFX-1.8/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-1.8/NOPB reliable?
The price and inventory of LM4128CMFX-1.8/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-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CMFX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMFX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMFX-1.8/NOPB?
LM4128CMFX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMFX-1.8/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-1.8/NOPB?
For technical support, including LM4128CMFX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMFX-1.8/NOPB requirements.
6.How does Aetrix verify that LM4128CMFX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CMFX-1.8/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-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CMFX-1.8/NOPB?
All LM4128CMFX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMFX-1.8/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-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4128CMFX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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