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Texas Instruments LM4128CMFX-2.5/NOPB
- Part No.:
- LM4128CMFX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMFX-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,753
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Product details
Overview
LM4128CMFX-2.5/NOPB from Texas Instruments is a precision micropower series voltage reference in a 5-pin SOT-23 package, delivering 2.5 V output with ±0.5% initial accuracy (C grade), 100 ppm/°C max temperature coefficient, and 60 µA supply 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 data acquisition systems.
For engineers reviewing the LM4128CMFX-2.5/NOPB datasheet, LM4128CMFX-2.5/NOPB pinout, LM4128CMFX-2.5/NOPB application, or LM4128CMFX-2.5/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), line regulation (50 ppm/V), load regulation (25–120 ppm/mA), 0.1–10 Hz noise (275 µVPP), and stability with capacitive loads up to 10 µF without external compensation.
Technical Context
The LM4128CMFX-2.5/NOPB uses a band-gap-derived reference core optimized for low quiescent current and high PSRR. Its enable input controls internal biasing via a 2 µA pull-up, allowing full shutdown below 35% of VIN. The device maintains regulation with input voltages as low as VREF + 400 mV (i.e., ≥2.9 V) and tolerates indefinite output short-circuit conditions up to 75 mA.
Designed for space-constrained applications, it eliminates need for external stabilization capacitors while remaining stable with ceramic COUT up to 10 µF. Input capacitor CIN ≥ COUT is required; minimum CIN is 0.1 µF when COUT = 0. Thermal hysteresis is limited to 75 ppm over −40°C to +125°C cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.5% initial accuracy (C grade) - ensures ADC/DAC reference stability within 12.5 mV at room temperature |
| Temperature Coefficient | 100 ppm/°C max - limits drift to ±250 µV/°C across operating range, critical for precision sensor signal chains |
| Supply Current | 60 µA typical - enables multi-year operation on coin-cell batteries in always-on monitoring systems |
| Dropout Voltage | 400 mV max at 10 mA - allows use with 3.3 V rails while maintaining regulation under load |
| Output Noise | 275 µVPP (0.1–10 Hz) - supports 16-bit+ resolution in low-frequency measurement front-ends |
| Enable Threshold | VIL ≤ 35% VIN, VIH ≥ 65% VIN - compatible with standard CMOS logic levels across supply range |
| Load Current | 20 mA max - sufficient to drive multiple op-amp references or SAR ADC reference inputs directly |
Pinout & Package
LM4128CMFX-2.5/NOPB is housed in a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, JEDEC MO-178AA compliant, and rated for −40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect terminal - must remain unconnected and floating per datasheet; not internally bonded |
| 2 | GND | Analog ground reference - requires low-impedance connection to system AGND plane to minimize noise coupling |
| 3 | EN | Active-high enable input - pulls up internally with ~2 µA; drives high to activate reference, low to enter 3–7 µA shutdown |
| 4 | VIN | Input supply - accepts 2.9 V to 5.5 V; must exceed VREF by ≥400 mV for full-load regulation |
| 5 | VREF | Precision 2.5 V output - low-impedance source capable of sourcing up to 20 mA; stable with 0–10 µF capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to 3–7 µA, enabling ultra-low-power sleep modes in portable instruments |
| No external stabilization cap needed | Eliminates BOM cost and PCB area for compensation networks while ensuring stability with 10 µF COUT |
| Low dropout voltage | Enables operation from single Li-ion or 3.3 V rails without LDO pre-regulation |
| Stable with low-ESR ceramics | Supports X5R/X7R MLCCs for compact, reliable filtering - no tantalum or electrolytic required |
| Indefinite short-circuit protection | Withstands output-to-ground faults continuously without damage or parameter shift |
Applications
| Portable Data Loggers | Battery-Powered Medical Sensors |
|---|---|
Use Scenario: Continuous 24/7 environmental monitoring using 16-bit sigma-delta ADCs powered by CR2032 cells. IC Role / Device Role / Timing Role: Primary 2.5 V reference for ADC and analog front-end amplifiers. Use Value: 60 µA quiescent current extends battery life beyond 5 years; 275 µVPP noise preserves effective resolution. | Use Scenario: Wearable ECG patch acquiring sub-mV biopotentials with minimal size and thermal mass. IC Role / Device Role / Timing Role: Precision reference for instrumentation amplifier gain-setting and ADC conversion. Use Value: 100 ppm/°C tempco ensures <±0.3 mV drift across body-temperature range; SOT-23 footprint saves board space. |
| Industrial Process Transmitters | Automotive Cabin Air Quality Modules |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Stable 2.5 V reference for DAC-based current loop control and sensor excitation. Use Value: −40°C to +125°C rating covers extended junction temperatures; 400 mV dropout allows direct use of loop supply. | Use Scenario: Compact air quality sensor node inside vehicle dashboard with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Reference for CO₂ and VOC sensor signal conditioning and microcontroller ADC. Use Value: Enable pin synchronizes reference activation with measurement bursts, cutting average current to <1 µA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | 2.5 V, 0.2% initial accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-5 - tighter tempco but higher grade cost | Preferred where long-term stability <30 ppm/1000 hrs is required; less tolerant of >10 µF COUT | Select REF3025AIDBZR for metrology-grade systems needing lower drift; LM4128CMFX-2.5/NOPB offers better cost-performance balance for industrial sensors |
| ADR3425ARTZ-R7 | 2.5 V, 0.1% initial accuracy, 10 ppm/°C, 120 µA IQ, SOT-23-5 - superior tempco but doubles supply current | Suitable for high-precision lab equipment; requires careful thermal layout due to higher power dissipation | Choose ADR3425ARTZ-R7 only when 10 ppm/°C is mandatory; LM4128CMFX-2.5/NOPB delivers adequate performance at half the IQ for battery-sensitive designs |
Compared with REF3025AIDBZR and ADR3425ARTZ-R7, the LM4128CMFX-2.5/NOPB provides optimal trade-off between micropower operation (60 µA), robust capacitive-load stability (up to 10 µF), and industrial-grade accuracy (±0.5%), making it uniquely suited for cost-sensitive, space-constrained, and battery-operated embedded systems.
Availability
LM4128CMFX-2.5/NOPB is available at Aetrix Electronics and suitable for portable medical devices, industrial process transmitters, and automotive cabin sensor modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128CMFX-2.5/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 product line delivers micropower, low-drift series voltage references for space-constrained, battery-operated, and high-accuracy measurement systems - designed specifically for instrumentation, portable test gear, and automotive sensor interfaces.
FAQ
What is the maximum input voltage for LM4128CMFX-2.5/NOPB?
The LM4128CMFX-2.5/NOPB supports a maximum input voltage of 5.5 V across its full operating temperature range. Exceeding this limit risks permanent damage, as absolute maximum rating for any pin is 6 V. Operation above 5.5 V violates the Absolute Maximum Ratings table and may degrade long-term stability or cause immediate failure.
Does LM4128CMFX-2.5/NOPB require an input capacitor?
Yes, LM4128CMFX-2.5/NOPB requires an input capacitor (CIN). The datasheet mandates CIN ≥ COUT, with a minimum value of 0.1 µF when no output capacitor is used. Ceramic X5R/X7R types are recommended; omitting CIN risks instability and degraded transient response, especially during startup or load switching.
What is the output voltage tolerance of LM4128CMFX-2.5/NOPB over temperature?
The LM4128CMFX-2.5/NOPB (C grade) has a guaranteed initial accuracy of ±0.5% at 25°C and a maximum temperature coefficient of 100 ppm/°C over −40°C to +125°C. This results in total output variation of ≤±0.5% + (100 ppm/°C × 165°C) ≈ ±0.5% + ±0.0165 = ±0.5165%, or ±12.9 mV at 2.5 V.
Can LM4128CMFX-2.5/NOPB drive a 10 µF output capacitor?
Yes, LM4128CMFX-2.5/NOPB is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, including low-ESR ceramic types. Unlike many references, it does not require external series resistance or isolation components - enabling direct connection to large bulk capacitance for improved load transient response.
Is LM4128CMFX-2.5/NOPB qualified for automotive applications?
No, LM4128CMFX-2.5/NOPB is not AEC-Q100 qualified. Only the LM4128AQ/BQ/CQ/DQ variants (e.g., LM4128CMFQ-2.5/NOPB) carry AEC-Q100 Grade 1 qualification. The "C" grade suffix in LM4128CMFX-2.5/NOPB denotes initial accuracy (±0.5%), not automotive qualification - users requiring automotive compliance must select Q-suffix part numbers.
LM4128CMFX-2.5/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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 275µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.9V ~ 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-2.5/NOPB FAQ
1.How can I place an order for LM4128CMFX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMFX-2.5/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-2.5/NOPB reliable?
The price and inventory of LM4128CMFX-2.5/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-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CMFX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMFX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMFX-2.5/NOPB?
LM4128CMFX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMFX-2.5/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-2.5/NOPB?
For technical support, including LM4128CMFX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMFX-2.5/NOPB requirements.
6.How does Aetrix verify that LM4128CMFX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CMFX-2.5/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-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CMFX-2.5/NOPB?
All LM4128CMFX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMFX-2.5/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-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128CMFX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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