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Texas Instruments LM4128CMF-2.5/NOPB
- Part No.:
- LM4128CMF-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMF-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,669
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Product details
Overview
LM4128CMF-2.5/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 2.5 V output with ±0.5% initial accuracy, 100 ppm/°C max temperature coefficient, and 60 µA supply current. It features an enable pin for 3–7 µA shutdown mode and supports up to 20 mA output current - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128CMF-2.5/NOPB datasheet, LM4128CMF-2.5/NOPB pinout, LM4128CMF-2.5/NOPB application, or LM4128CMF-2.5/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), load regulation (25–120 ppm/mA), 0.1–10 Hz noise (275 µVPP), and compatibility with ceramic capacitors up to 10 µF without external compensation.
Technical Context
The LM4128CMF-2.5/NOPB uses an internal band-gap-derived reference core with active error correction to achieve stable 2.5 V output across −40°C to +125°C. Its enable input controls a low-leakage internal switch that reduces quiescent current to ≤7 µA while maintaining fast turn-on time (≤78.8 µs with 10 µF load).
Designed as a series reference, it operates with VIN ≥ VREF + 400 mV (i.e., ≥2.9 V) and delivers regulated output without requiring an external stabilizing capacitor - though CIN ≥ 0.1 µF is mandatory and COUT up to 10 µF improves transient response. It provides indefinite short-circuit protection limiting output current to 75 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.5% initial accuracy (C-grade device) |
| Tempco | 100 ppm/°C max over −40°C to +125°C - ensures <±250 µV drift across full range |
| Supply Current | 60–100 µA typical - enables multi-year operation on coin-cell batteries |
| Shutdown Current | 3–7 µA when EN = 0 V - preserves energy during system sleep modes |
| Dropout Voltage | 175–400 mV at 10 mA load - allows operation from 2.9 V input minimum |
| Noise (0.1–10 Hz) | 275 µVPP - suitable for 12-bit ADC references without additional filtering |
| Load Regulation | 25–120 ppm/mA - maintains stability under dynamic load changes up to 20 mA |
Pinout & Package
LM4128CMF-2.5/NOPB is housed in a 5-pin SOT-23 (DBV) package with 1.6 mm × 2.9 mm footprint and 0.95 mm height. Pin 1 is N/C (no connect); pins 2–5 are GND, EN, VIN, and VREF respectively - requiring no PCB copper pour enhancements for thermal management at ≤350 mW dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must remain floating; not internally bonded - no routing or soldering required |
| Pin 2 (GND) | Analog ground reference | Primary return path for reference core and enable logic; requires low-impedance connection to system AGND |
| Pin 3 (EN) | Active-high enable input | Drives internal pass element; VIH ≥65% VIN, VIL ≤35% VIN - compatible with 1.8 V/3.3 V logic |
| Pin 4 (VIN) | Unregulated input supply | Accepts 2.9 V to 5.5 V; must exceed VREF by ≥400 mV at full load to maintain regulation |
| Pin 5 (VREF) | Precision 2.5 V output | Low-impedance buffered reference node; stable with 0–10 µF capacitive loads and resistive loads down to 125 Ω |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Stable operation without COUT; only CIN ≥0.1 µF mandatory - reduces BOM count and board area |
| Capacitive load drive | Supports up to 10 µF output capacitance - enables fast load transient recovery in DAC/ADC buffer stages |
| Low ESR ceramic compatibility | Works with X5R/X7R MLCCs - eliminates need for tantalum or electrolytic capacitors in space-constrained designs |
| Indefinite short-circuit protection | Self-limits output to 75 mA during fault - prevents thermal runaway and enables safe hot-swap operation |
| Wide junction temperature range | −40°C to +125°C operation - qualified for automotive engine control units and industrial motor drives |
Applications
| Instrumentation Signal Chain | Portable Medical Sensors |
|---|---|
|
Use Scenario: High-resolution analog front-end for handheld multimeters and calibration equipment. IC Role / Device Role / Timing Role: Primary 2.5 V reference for 16-bit SAR ADC and programmable gain amplifier. Use Value: ±0.5% initial accuracy and 100 ppm/°C tempco ensure <±0.5 LSB error over temperature without calibration. |
Use Scenario: Power-sensitive glucose meters and pulse oximeters with single-cell Li-ion supply. IC Role / Device Role / Timing Role: Stable excitation source for biosensor transimpedance amplifiers and ADC biasing. Use Value: 60 µA operating current and 3–7 µA shutdown extend battery life beyond 2 years in intermittent-use devices. |
| Industrial Data Acquisition | Automotive Body Control Modules |
|
Use Scenario: Modular PLC I/O modules requiring precise analog input scaling across wide ambient temperatures. IC Role / Device Role / Timing Role: Reference for isolated 4–20 mA loop transmitter DACs and RTD measurement bridges. Use Value: Thermal hysteresis of 75 ppm and long-term stability of 50 ppm/1000 hrs minimize recalibration frequency in field-deployed units. |
Use Scenario: Cabin climate control sensors and seat position feedback circuits in passenger vehicles. IC Role / Device Role / Timing Role: Voltage reference for microcontroller ADC channels monitoring thermistors and potentiometers. Use Value: AEC-Q100 Grade 1 qualification (LM4128CQ variant) and −40°C to +125°C operation meet automotive environmental 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 |
|---|---|---|---|
| REF3025AIDBZR | 2.5 V, ±0.2% initial accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-3 - no enable pin, lower tempco, higher grade | Lacks shutdown mode; better for always-on ultra-precision systems where power is secondary to drift performance | Select REF3025AIDBZR when tempco <50 ppm/°C and absence of enable functionality is acceptable |
| MAX6025AEUR+T | 2.5 V, ±0.1% initial accuracy, 30 ppm/°C, 35 µA IQ, SOT-23-3 - no enable, tighter spec, higher cost | Superior long-term stability (20 ppm/1000 hrs) but no power-gating capability - suited for metrology-grade instruments | Choose MAX6025AEUR+T for lab-grade test equipment where 0.1% accuracy and minimal drift outweigh need for shutdown |
Compared with LM4128CMF-2.5/NOPB, REF3025AIDBZR offers lower tempco and higher grade accuracy but omits enable control, while MAX6025AEUR+T delivers best-in-class stability and precision at the cost of design flexibility and power management capability.
Availability
LM4128CMF-2.5/NOPB is available at Aetrix Electronics and suitable for instrumentation & process control, portable medical sensors, and industrial data acquisition systems requiring stable component supply with guaranteed long-term sourcing and RoHS-compliant packaging.
Supply support for LM4128CMF-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 high-reliability power management solutions.
The LM4128 product line delivers micropower, low-drift series voltage references for space-constrained, battery-operated, and automotive-grade applications - designed to replace bulkier shunt references while enabling simplified layout and extended runtime.
FAQ
What is the minimum input voltage required for stable operation of LM4128CMF-2.5/NOPB?
The LM4128CMF-2.5/NOPB requires VIN ≥ VREF + 400 mV, i.e., ≥2.9 V at 10 mA load, to maintain regulation within specifications. Below this, output voltage drops nonlinearly; at 2.5 V input, regulation fails entirely. Dropout is load- and temperature-dependent - worst-case is 400 mV at 10 mA and 125°C.
Does LM4128CMF-2.5/NOPB require an output capacitor to remain stable?
No - LM4128CMF-2.5/NOPB is internally compensated and stable with 0 µF output capacitance. An optional COUT (up to 10 µF) improves load transient response but increases turn-on time. CIN ≥0.1 µF is mandatory; CIN must be ≥ COUT if both are used.
What does the 'C' in LM4128CMF-2.5/NOPB indicate?
The 'C' denotes the initial accuracy grade: ±0.5% over temperature. LM4128AMF-2.5/NOPB is ±0.1%, 'B' is ±0.2%, 'C' is ±0.5%, and 'D' is ±1.0%. All grades share identical pinout, package, and functional behavior - only accuracy and tempco differ per grade.
Can LM4128CMF-2.5/NOPB drive a 10 µF ceramic capacitor directly at its output?
Yes - LM4128CMF-2.5/NOPB is explicitly characterized for stability with capacitive loads up to 10 µF, including low-ESR X5R/X7R ceramics. No series resistance or isolation is needed. Transient response degrades slightly vs. smaller loads, but regulation remains intact.
Is LM4128CMF-2.5/NOPB qualified for automotive applications?
The base LM4128CMF-2.5/NOPB is not AEC-Q100 qualified. However, the pin-compatible LM4128CQMF-2.5/NOPB variant is AEC-Q100 Grade 1 qualified (−40°C to +125°C) and manufactured on TI's automotive flow - same electrical specs, enhanced traceability and reliability screening.
LM4128CMF-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
LM4128CMF-2.5/NOPB FAQ
1.How can I place an order for LM4128CMF-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMF-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 LM4128CMF-2.5/NOPB reliable?
The price and inventory of LM4128CMF-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 LM4128CMF-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CMF-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMF-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMF-2.5/NOPB?
LM4128CMF-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMF-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 LM4128CMF-2.5/NOPB?
For technical support, including LM4128CMF-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMF-2.5/NOPB requirements.
6.How does Aetrix verify that LM4128CMF-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CMF-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 LM4128CMF-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CMF-2.5/NOPB?
All LM4128CMF-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMF-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 LM4128CMF-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128CMF-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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