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Texas Instruments LM4128BMFX-3.0/NOPB
- Part No.:
- LM4128BMFX-3.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMFX-3.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,305
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Product details
Overview
LM4128BMFX-3.0/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 3.0 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 systems.
For engineers reviewing the LM4128BMFX-3.0/NOPB datasheet, LM4128BMFX-3.0/NOPB pinout, LM4128BMFX-3.0/NOPB application, or LM4128BMFX-3.0/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The LM4128BMFX-3.0/NOPB is a band-gap-based series voltage reference with internal enable logic and no external capacitor requirement for stability. Its architecture ensures operation with capacitive loads up to 10 µF while maintaining 0.5% output accuracy across input voltages from 3.4 V to 5.5 V (VREF + 400 mV minimum dropout).
It delivers low-noise 3.0 V reference output (285 µVPP, 0.1–10 Hz), exhibits 70 ppm/V line regulation and 25–120 ppm/mA load regulation, and achieves thermal hysteresis of 75 ppm over −40°C to +125°C - enabling high-resolution ADC/DAC biasing in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V nominal, ±0.2% initial accuracy (Grade B) - ensures ≤±6 mV absolute error at 25°C for 12-bit+ system calibration. |
| Tempco | 75 ppm/°C max - limits drift to ≤±9.45 mV over full −40°C to +125°C range, critical for unheated sensor front-ends. |
| Supply Current | 60 µA typical - enables >1-year battery life in 10 µA-sleep IoT nodes when paired with enable control. |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces quiescent power by 95% vs active mode, supporting duty-cycled measurement systems. |
| Dropout Voltage | 175–400 mV at 10 mA - allows operation from single-cell Li-ion (3.0–4.2 V) or 3.3 V rails with margin for aging and ripple. |
| Noise (0.1–10 Hz) | 285 µVPP - supports 16-bit SAR ADCs without additional filtering in precision analog signal chains. |
| Load Drive | 20 mA max - sufficient to drive multiple op-amp references, ADC buffers, or DAC bias networks directly. |
Pinout & Package
LM4128BMFX-3.0/NOPB uses the 5-pin SOT-23 (DBV) package per TI package number DBV (R-PDSO-G5), with 0.95 mm pitch, 2.9 mm × 1.6 mm footprint, and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain floating; no PCB trace or via - avoids parasitic coupling affecting reference stability. |
| 2 - GND | Analog ground reference | Low-impedance return path for reference current; requires dedicated ground plane connection near pin. |
| 3 - EN | Active-high enable input | Drives internal regulator; VIH ≥65% VIN, VIL ≤35% VIN - compatible with 1.8 V, 3.3 V, or 5 V logic without level shift. |
| 4 - VIN | Input supply rail | Accepts 3.4 V to 5.5 V; must be bypassed with ≥0.1 µF ceramic capacitor (CIN) placed within 2 mm of pin. |
| 5 - VREF | Precision 3.0 V output | Low-impedance buffered reference; stable with COUT up to 10 µF - improves transient response for dynamic loads. |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to ≤7 µA, enabling microcontroller-gated power cycling in portable test equipment. |
| No external stabilization cap required | Eliminates need for output capacitor while remaining stable with up to 10 µF load - simplifies layout and reduces BOM count. |
| Low ESR ceramic capacitor compatibility | Validated with X5R/X7R dielectrics - avoids instability risks associated with tantalum or aluminum electrolytics. |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault - prevents device destruction and maintains system-level safety in field-deployed hardware. |
| −40°C to +125°C operation | Qualified across full automotive junction temperature range - suitable for under-hood or industrial motor-control applications. |
Applications
| Portable Data Loggers | Automotive Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring node sampling temperature, humidity, and pressure at 1 Hz with 16-bit ADC. IC Role / Device Role / Timing Role: Provides stable 3.0 V reference for ADC conversion and sensor excitation circuitry. Use Value: 60 µA supply current and 3 µA shutdown extend CR2032 battery life beyond 2 years; ±0.2% accuracy ensures <0.5 LSB error at 16-bit resolution. |
Use Scenario: Engine control unit measuring exhaust gas oxygen (EGO) sensor output under wide thermal cycling (−40°C to +125°C). IC Role / Device Role / Timing Role: Supplies precision bias voltage to op-amp signal conditioning stage before ADC digitization. Use Value: 75 ppm/°C tempco and 75 ppm thermal hysteresis maintain <±10 mV total drift across temperature cycles - meeting ASAM MCD-2 MC calibration requirements. |
| Medical Patient Monitor Front-End | Industrial PLC Analog Input Module |
|
Use Scenario: Portable ECG device acquiring biopotential signals with 24-bit delta-sigma ADC and isolated power. IC Role / Device Role / Timing Role: Generates clean 3.0 V reference for ADC reference input and programmable gain amplifier (PGA) biasing. Use Value: 285 µVPP (0.1–10 Hz) noise contributes <0.05% of full-scale noise floor - preserving diagnostic-grade SNR without post-processing. |
Use Scenario: DIN-rail mounted PLC module accepting 4–20 mA current loop inputs with local 3.3 V digital domain. IC Role / Device Role / Timing Role: Supplies calibrated 3.0 V reference for current-to-voltage conversion and ADC reference in isolated analog section. Use Value: 20 mA output drive supports simultaneous biasing of multiple instrumentation amplifiers; SOT-23 footprint enables dense channel packing (≥16 channels per 100 mm²). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3030AIDBZR | 3.0 V, ±0.2% initial accuracy, 100 ppm/°C tempco, 50 µA IQ, SOT-23-3 - lacks enable pin and has higher tempco. | Not suitable for shutdown-sensitive battery systems; requires external enable circuitry for power gating. | Select REF3030AIDBZR only if board space is constrained to 3-pin footprint and enable functionality is implemented externally. |
| ADR3430ARJZ-R7 | 3.0 V, ±0.1% initial accuracy, 10 ppm/°C max tempco, 120 µA IQ, SOT-23-5 - superior stability but doubles supply current. | Better for metrology-grade instruments where long-term drift and tempco dominate over power budget. | Choose ADR3430ARJZ-R7 when 10 ppm/°C tempco and 15 ppm/1000h long-term stability outweigh 2× IQ penalty in mains-powered lab equipment. |
Compared with LM4128BMFX-3.0/NOPB, REF3030AIDBZR trades enable functionality and lower tempco for smaller size and lower IQ, while ADR3430ARJZ-R7 delivers ultra-low drift at the cost of doubled quiescent current - making LM4128BMFX-3.0/NOPB the optimal balance for space-constrained, battery-aware industrial sensing.
Availability
LM4128BMFX-3.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, and industrial PLC analog input designs requiring stable component supply, extended temperature support, and verified enable-controlled power management.
Supply support for LM4128BMFX-3.0/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 automotive-grade qualification.
The LM4128 product line delivers micropower, enable-capable series voltage references optimized for battery-operated instrumentation, automotive sensors, and industrial control systems demanding accuracy, stability, and small-footprint integration.
FAQ
What is the maximum input voltage for LM4128BMFX-3.0/NOPB?
The LM4128BMFX-3.0/NOPB supports a maximum input voltage of 5.5 V. Operation above this level risks permanent damage, as specified in the Absolute Maximum Ratings. For reliable performance, VIN must also remain ≥3.4 V (VREF + 400 mV) to maintain 0.5% output accuracy at 10 mA load - ensuring compatibility with standard 3.3 V and single-cell Li-ion supplies.
Does LM4128BMFX-3.0/NOPB require an input capacitor?
Yes, LM4128BMFX-3.0/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) placed within 2 mm of the VIN and GND pins. This capacitor is mandatory for stability and noise suppression; omitting it may cause oscillation or degraded PSRR. When using an output capacitor (COUT), CIN must be ≥COUT - e.g., 1 µF COUT requires ≥1 µF CIN.
What is the function of Pin 1 (N/C) on LM4128BMFX-3.0/NOPB?
Pin 1 of LM4128BMFX-3.0/NOPB is a no-connect (N/C) terminal and must remain electrically floating - unconnected to any trace, plane, or component. TI explicitly states this pin has no internal connection; routing to ground or VCC introduces parasitic capacitance that can degrade reference stability and increase noise susceptibility in sensitive analog layouts.
Can LM4128BMFX-3.0/NOPB drive a 10 µF output capacitor?
Yes, LM4128BMFX-3.0/NOPB is explicitly characterized as stable with capacitive loads up to 10 µF. Adding COUT improves load transient response when switching between light and heavy loads, though it increases turn-on time (e.g., ~78.8 µs to 90% with 10 µF). Use low-ESR X5R/X7R ceramics; avoid high-ESR types like tantalum which risk instability.
What grade does the 'B' in LM4128BMFX-3.0/NOPB indicate?
The 'B' in LM4128BMFX-3.0/NOPB denotes Grade B performance: ±0.2% initial output voltage accuracy at 25°C and 75 ppm/°C maximum temperature coefficient over −40°C to +125°C. This grade balances cost and precision for industrial and automotive applications where tighter tolerances than Grade C/D are needed but Grade A's ±0.1% is unnecessary.
LM4128BMFX-3.0/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):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 285µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3.4V ~ 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-3.0/NOPB FAQ
1.How can I place an order for LM4128BMFX-3.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMFX-3.0/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-3.0/NOPB reliable?
The price and inventory of LM4128BMFX-3.0/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-3.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BMFX-3.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMFX-3.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMFX-3.0/NOPB?
LM4128BMFX-3.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMFX-3.0/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-3.0/NOPB?
For technical support, including LM4128BMFX-3.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMFX-3.0/NOPB requirements.
6.How does Aetrix verify that LM4128BMFX-3.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BMFX-3.0/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-3.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BMFX-3.0/NOPB?
All LM4128BMFX-3.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMFX-3.0/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-3.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128BMFX-3.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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