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Texas Instruments LM4128BMFX-2.5/NOPB
- Part No.:
- LM4128BMFX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMFX-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,100
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Product details
Overview
LM4128BMFX-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 ±0.2% initial accuracy, 75 ppm/°C 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.
For engineers reviewing the LM4128BMFX-2.5/NOPB datasheet, LM4128BMFX-2.5/NOPB pinout, LM4128BMFX-2.5/NOPB application, or LM4128BMFX-2.5/NOPB equivalent, this page provides verified specifications, validated pin functions, confirmed thermal and load regulation behavior, and real-world design context for high-accuracy analog signal chains.
Technical Context
The LM4128BMFX-2.5/NOPB uses a band-gap–based series reference architecture with internal enable control logic and low-dropout regulation (400 mV max at 10 mA). Its stability is guaranteed without external compensation, supporting capacitive loads up to 10 µF while maintaining monotonic startup and indefinite short-circuit protection.
It achieves precision via trimmed initial voltage accuracy and low thermal hysteresis (75 ppm), with line regulation of 50 ppm/V and load regulation of 25–120 ppm/mA across −40°C to +125°C. The device requires only a minimum 0.1 µF input ceramic capacitor and tolerates no output capacitor - simplifying layout in space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.2% initial accuracy (Grade B) - ensures ≤±5 mV absolute error at 25°C for 12-bit ADC reference scaling |
| Temperature Coefficient | 75 ppm/°C (max, Grade B) - limits drift to ≤18.75 mV over −40°C to +125°C full range |
| Supply Current | 60 µA typical - enables multi-year operation on coin-cell batteries in always-on sensor nodes |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces quiescent power by >90% during system sleep modes |
| Dropout Voltage | 175–400 mV at 10 mA - allows operation from 2.675 V input, compatible with single Li-ion or dual alkaline supplies |
| Output Noise | 275 µVPP (0.1–10 Hz) - supports 16-bit resolution in low-frequency measurement systems without added filtering |
| Load Current Capability | Up to 20 mA - drives ADC reference inputs, op-amp bias networks, and DAC buffers directly |
Pinout & Package
LM4128BMFX-2.5/NOPB is housed in a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, JEDEC MO-178AC compliant, and RoHS-compliant matte tin (Sn) lead finish. Thermal resistance θJ-A = 220°C/W enables operation at full junction temperature (125°C) with minimal PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected and floating; no internal connection or function |
| 2 - GND | Analog ground reference | Primary return path for reference output and internal bias; must tie to clean analog ground plane |
| 3 - EN | Enable control input | Active-high logic: ≥65% of VIN enables output; ≤35% disables output and reduces IQ to ≤7 µA |
| 4 - VIN | Input supply | Accepts 2.9 V to 5.5 V (VREF + 400 mV min); bypassed externally with ≥0.1 µF ceramic capacitor |
| 5 - VREF | Precision reference output | 2.5 V regulated output; stable into 10 µF capacitive load; requires no output capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Grade B precision | ±0.2% initial accuracy and 75 ppm/°C tempco - meets requirements for industrial-grade 12-bit data converters |
| Capacitor-free stability | Stable with zero output capacitance and up to 10 µF load - eliminates layout sensitivity and ESR dependency |
| Ultra-low quiescent current | 60 µA operating / 3 µA shutdown - extends battery life in portable medical and IoT edge sensors |
| Wide temperature operation | −40°C to +125°C junction range - qualified for automotive under-hood and industrial motor-control environments |
| Indefinite short-circuit protection | Self-limiting to 75 mA output current - prevents damage during test, fault, or miswiring events |
Applications
| Instrumentation Signal Conditioning | Portable Data Acquisition |
|---|---|
|
Use Scenario: High-resolution thermocouple or strain-gauge front-end with 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and sensor excitation circuitry. Use Value: 275 µVPP low-frequency noise and 75 ppm/°C tempco ensure <0.01% total error over temperature without calibration. |
Use Scenario: Handheld multimeter or environmental logger powered by two AA cells. IC Role / Device Role / Timing Role: Stable 2.5 V reference for ADC, LCD bias, and microcontroller VREF input. Use Value: 60 µA supply current and 2.675 V minimum input enable >500 hours runtime on alkaline batteries. |
| Battery-Powered Medical Sensors | Automotive Body Control Modules |
|
Use Scenario: Wearable ECG patch with ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Precision reference for biopotential amplifier gain-setting and ADC reference. Use Value: Shutdown mode draws ≤7 µA, enabling deep-sleep states while preserving reference integrity for fast wake-up. |
Use Scenario: In-cabin temperature/humidity sensor node in 12 V automotive system with LDO pre-regulation. IC Role / Device Role / Timing Role: Secondary reference for local ADCs monitoring HVAC actuators and switches. Use Value: −40°C to +125°C operation and AEC-Q100–compatible LM4128Q family lineage ensure reliability in non-engine-bay locations. |
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 noise (20 µVRMS) | Lacks shutdown control; requires external enable circuitry if low-power sleep is needed | Choose when lowest possible noise and smallest footprint (3-pin) outweigh need for integrated enable |
| ADR3425ARJZ-R7 | 2.5 V, ±0.1% initial accuracy, 10 ppm/°C, 120 µA IQ, SOT-23-5 - includes enable, tighter tempco, higher IQ | Higher supply current reduces battery life; superior tempco justifies use in high-stability lab equipment | Choose when long-term stability and sub-20 ppm/°C drift dominate over micropower constraints |
Compared with LM4128BMFX-2.5/NOPB, REF3025AIDBZR saves board space and noise but removes shutdown capability, while ADR3425ARJZ-R7 improves accuracy and drift at the cost of 2× supply current - making LM4128BMFX-2.5/NOPB the optimal balance for battery-operated industrial sensors requiring enable control.
Availability
LM4128BMFX-2.5/NOPB is available at Aetrix Electronics and suitable for instrumentation signal conditioning, portable data acquisition, battery-powered medical sensors, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128BMFX-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 reference design and high-reliability automotive-grade components.
The LM4128 series was developed for space-constrained, battery-sensitive applications demanding grade-B to grade-A accuracy, low dropout, and robust thermal performance - targeting portable instrumentation, industrial sensing, and automotive subsystems.
FAQ
What is the maximum input voltage for LM4128BMFX-2.5/NOPB?
The LM4128BMFX-2.5/NOPB supports a maximum input voltage of 5.5 V across its full operating temperature range. This limit is defined in the Absolute Maximum Ratings table and applies regardless of load or enable state. Exceeding 5.5 V risks permanent damage to the internal band-gap circuitry and ESD protection structures.
Does LM4128BMFX-2.5/NOPB require an output capacitor to remain stable?
No, LM4128BMFX-2.5/NOPB is internally compensated and stable with zero output capacitance. It remains stable with capacitive loads up to 10 µF, making it suitable for direct driving of ADC reference inputs or op-amp bias networks without added external components.
What is the minimum input voltage required for LM4128BMFX-2.5/NOPB to maintain regulation at 10 mA load?
At 10 mA load, LM4128BMFX-2.5/NOPB requires VIN ≥ VREF + 400 mV = 2.9 V to maintain regulation within 0.5% of 2.5 V. Dropout voltage is specified as 175–400 mV depending on temperature and unit variation, so 2.9 V ensures guaranteed operation across Grade B units and full temperature range.
How does the enable pin (EN) function on LM4128BMFX-2.5/NOPB?
The EN pin on LM4128BMFX-2.5/NOPB is active-high with VIH ≥ 65% of VIN and VIL ≤ 35% of VIN. When pulled high (≥65% VIN), the device delivers full 2.5 V output; when pulled low (≤35% VIN), it enters shutdown mode drawing ≤7 µA. The pin has an internal ~2 µA pull-up, allowing direct connection to VIN for always-on operation.
Is LM4128BMFX-2.5/NOPB suitable for automotive applications?
LM4128BMFX-2.5/NOPB is not AEC-Q100 qualified, but shares the same silicon and package as the LM4128Q series (e.g., LM4128BQMF-2.5/NOPB), which is AEC-Q100 Grade 1 qualified. For production automotive use, the Q-grade variant must be selected; LM4128BMFX-2.5/NOPB is appropriate for non-safety-critical automotive subsystems where qualification is not mandated.
LM4128BMFX-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:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°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
LM4128BMFX-2.5/NOPB FAQ
1.How can I place an order for LM4128BMFX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMFX-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 LM4128BMFX-2.5/NOPB reliable?
The price and inventory of LM4128BMFX-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 LM4128BMFX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BMFX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMFX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMFX-2.5/NOPB?
LM4128BMFX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMFX-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 LM4128BMFX-2.5/NOPB?
For technical support, including LM4128BMFX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMFX-2.5/NOPB requirements.
6.How does Aetrix verify that LM4128BMFX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BMFX-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 LM4128BMFX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BMFX-2.5/NOPB?
All LM4128BMFX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMFX-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 LM4128BMFX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128BMFX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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