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Texas Instruments LM4128DMF-2.5/NOPB
- Part No.:
- LM4128DMF-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DMF-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,443
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Product details
Overview
LM4128DMF-2.5/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) 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 supports up to 20 mA load 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.
For engineers reviewing the LM4128DMF-2.5/NOPB datasheet, LM4128DMF-2.5/NOPB pinout, LM4128DMF-2.5/NOPB application, or LM4128DMF-2.5/NOPB equivalent, key selection considerations include its 2.5 V fixed output, dropout voltage of ≤400 mV at 10 mA, stability with up to 10 µF capacitive loads, no external stabilizing capacitor requirement, and compatibility with low-ESR ceramic bypass capacitors.
Technical Context
The LM4128DMF-2.5/NOPB is a band-gap-based series voltage reference with internal enable logic and rail-to-rail input capability down to VREF + 400 mV. Its architecture eliminates need for external stabilization while maintaining stability with capacitive loads up to 10 µF and enabling fast turn-on (≤78.8 µs with 10 µF load).
It features indefinite short-circuit protection (75 mA current limit), thermal hysteresis of 75 ppm over −40°C to +125°C, and long-term stability of 50 ppm over 1000 hours - all specified for the C-grade variant matching the LM4128DMF-2.5/NOPB part number.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.5% initial accuracy (C grade) - ensures stable ADC/DAC reference within 12.5 mV tolerance at 25°C |
| Temperature Coefficient | 100 ppm/°C max - limits drift to ±0.3125 mV/°C across −40°C to +125°C operating range |
| Supply Current | 60 µA typical - enables multi-year operation on coin-cell batteries in low-power sensor nodes |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces quiescent power by >90% during system sleep modes |
| Dropout Voltage | ≤400 mV at 10 mA load - allows operation from 2.9 V supply, compatible with single Li-ion or 3.3 V LDO rails |
| Load Regulation | 25–120 ppm/mA - maintains output stability under dynamic load changes up to 20 mA |
| Noise (0.1–10 Hz) | 275 µVPP - suitable for 16-bit+ precision measurement systems without additional filtering |
Pinout & Package
LM4128DMF-2.5/NOPB uses the 5-pin SOT-23 (DBV) package (package code DBV, R-PDSO-G5), measuring 2.9 mm × 1.6 mm × 1.15 mm with gull-wing leads. Pin 1 is N/C (no connect), pin 2 is GND, pin 3 is EN, pin 4 is VIN, and pin 5 is VREF - confirmed per TI SNVS475E datasheet Figure 2 and PIN DESCRIPTIONS table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must be left floating; not internally bonded - no routing or grounding required |
| Pin 2 (GND) | Analog ground reference | Primary return path for reference current; requires low-impedance connection to system AGND plane |
| Pin 3 (EN) | Digital enable control input | Active-high logic: ≥65% of VIN enables output; ≤35% of VIN disables output into 3–7 µA shutdown |
| Pin 4 (VIN) | Input supply rail | Accepts 2.9 V to 5.5 V (VREF + 400 mV min); must be bypassed with ≥0.1 µF ceramic capacitor |
| Pin 5 (VREF) | Precision 2.5 V output | Delivers regulated 2.5 V to ADC references, DAC bias, or comparator thresholds; stable with 0–10 µF load capacitance |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to 3–7 µA, enabling ultra-low-power duty-cycled operation in portable systems |
| No external stabilization capacitor | Eliminates BOM cost and board space for compensation components while ensuring stability with up to 10 µF capacitive loads |
| Low dropout voltage | 400 mV max at 10 mA allows direct use from single-cell Li-ion (3.0–4.2 V) or 3.3 V system rails without pre-regulation |
| Stable with low-ESR ceramics | Supports X5R/X7R MLCCs as input/output bypass - avoids instability risks associated with tantalum or electrolytic capacitors |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault conditions, preventing device damage and enabling robust field deployment |
Applications
| Portable Data Acquisition | Industrial Sensor Transmitters |
|---|---|
|
Use Scenario: Battery-powered handheld multimeter sampling analog sensor signals at 100 kSPS using a 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for ADC full-scale calibration and offset nulling. Use Value: 100 ppm/°C tempco and 275 µVPP noise ensure <0.01% measurement error across temperature and time without recalibration. |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in −40°C to +85°C industrial environments. IC Role / Device Role / Timing Role: Supplies precision 2.5 V bias for bridge sensor excitation and signal conditioning amplifier gain setting. Use Value: 20 mA output drive and −40°C to +125°C junction rating support full-range operation without derating or thermal shutdown. |
| Medical Patient Monitoring | Automotive Body Control Modules |
|
Use Scenario: Wearable ECG front-end digitizing biopotential signals with 1 µV resolution requirements. IC Role / Device Role / Timing Role: Serves as low-noise reference for programmable-gain instrumentation amplifier and 24-bit delta-sigma ADC. Use Value: 60 µA quiescent current extends wearable battery life beyond 7 days; 50 ppm long-term stability minimizes recalibration frequency. |
Use Scenario: In-vehicle cabin temperature sensor node powered from 12 V battery via 3.3 V LDO, requiring AEC-Q100-compliant reference. IC Role / Device Role / Timing Role: Generates accurate 2.5 V reference for microcontroller ADC monitoring of thermistor and humidity sensor outputs. Use Value: LM4128DMF-2.5/NOPB's C-grade spec meets automotive ambient temperature and lifetime reliability requirements without AEC-Q100 qualification overhead. |
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-23-3 - no enable pin, 3-pin footprint | Requires external enable circuitry if shutdown needed; lower tempco but no integrated EN logic | Select when board space is constrained and shutdown is managed externally; verify layout compatibility with 3-pin vs 5-pin footprint |
| ADR3425ARJZ-R7 | 2.5 V, 0.1% initial accuracy, 10 ppm/°C, 120 µA IQ, SOT-23-5 - higher precision, higher IQ, same pinout | Better stability for metrology-grade systems; higher supply current reduces battery life in portable designs | Choose when 10 ppm/°C tempco and 0.1% accuracy justify 100% IQ increase; confirm thermal design handles extra dissipation |
Compared with REF3025AIDBZR and ADR3425ARJZ-R7, LM4128DMF-2.5/NOPB uniquely balances C-grade accuracy (±0.5%), integrated enable functionality, and ultra-low 60 µA supply current in a standard 5-pin SOT-23 - making it optimal for cost-sensitive, battery-operated systems needing moderate precision and active power management.
Availability
LM4128DMF-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical patient monitoring systems requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4128DMF-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, embedded processing, and high-reliability ICs for industrial, automotive, and communications markets.
The LM4128 family was designed as a micropower, precision series voltage reference for space-constrained, battery-operated systems demanding low dropout, wide temperature operation, and integrated enable control - with LM4128DMF-2.5/NOPB representing the 2.5 V, C-grade, SOT-23 variant.
FAQ
What is the initial accuracy specification for LM4128DMF-2.5/NOPB?
The LM4128DMF-2.5/NOPB is a C-grade device with ±0.5% initial output voltage accuracy at 25°C, meaning its 2.5 V output falls between 2.4875 V and 2.5125 V under nominal conditions. This is confirmed in the Electrical Characteristics table for LM4128-2.5 in TI SNVS475E, where LM4128C-2.5 specifies −0.5% to +0.5% limits. The 'D' in the part number denotes the C grade per TI's ordering nomenclature.
Does LM4128DMF-2.5/NOPB require an input capacitor?
Yes, LM4128DMF-2.5/NOPB requires an input capacitor (CIN) for stable operation. Per TI SNVS475E Section "Component Selection", CIN must be ≥0.1 µF when no output capacitor is used, and CIN ≥ COUT when an output capacitor is present. A ceramic X5R or X7R capacitor placed close to the VIN and GND pins is mandatory to prevent oscillation and ensure transient response integrity.
What is the maximum load current supported by LM4128DMF-2.5/NOPB?
LM4128DMF-2.5/NOPB supports up to 20 mA of continuous output current, as specified in both the FEATURES list and Operating Ratings section of the TI SNVS475E datasheet. Load regulation remains within 25–120 ppm/mA across this range, and the device includes indefinite short-circuit protection limiting output current to 75 mA during fault conditions.
Can LM4128DMF-2.5/NOPB operate from a 3.0 V supply?
Yes, LM4128DMF-2.5/NOPB can operate from a 3.0 V supply. Its minimum input voltage is VREF + 400 mV = 2.9 V at 10 mA load, per the Electrical Characteristics table. At 3.0 V input, it delivers full 2.5 V output with specified line regulation (50 ppm/V) and maintains stability - making it compatible with single-cell Li-ion (3.0–4.2 V) and regulated 3.3 V rails.
Is LM4128DMF-2.5/NOPB AEC-Q100 qualified?
No, LM4128DMF-2.5/NOPB is not AEC-Q100 qualified. Only the LM4128AQ/BQ/CQ/DQ variants are explicitly stated as AEC-Q100 Grade 1 qualified in the datasheet FEATURES section. LM4128DMF-2.5/NOPB is a commercial-grade part rated for −40°C to +125°C junction temperature but lacks automotive qualification documentation or flow certification.
LM4128DMF-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:
- ±1%
- 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
LM4128DMF-2.5/NOPB FAQ
1.How can I place an order for LM4128DMF-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DMF-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 LM4128DMF-2.5/NOPB reliable?
The price and inventory of LM4128DMF-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 LM4128DMF-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128DMF-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DMF-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DMF-2.5/NOPB?
LM4128DMF-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DMF-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 LM4128DMF-2.5/NOPB?
For technical support, including LM4128DMF-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DMF-2.5/NOPB requirements.
6.How does Aetrix verify that LM4128DMF-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128DMF-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 LM4128DMF-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128DMF-2.5/NOPB?
All LM4128DMF-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DMF-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 LM4128DMF-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128DMF-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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