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Texas Instruments LM4128CMF-3.3/NOPB
- Part No.:
- LM4128CMF-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMF-3.3/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,118
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Product details
Overview
LM4128CMF-3.3/NOPB from Texas Instruments is a precision micropower series voltage reference in a 5-pin SOT-23 package, delivering a stable 3.3 V output with ±0.5% initial accuracy, 100 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 current, and operates across −40°C to +125°C - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128CMF-3.3/NOPB datasheet, LM4128CMF-3.3/NOPB pinout, LM4128CMF-3.3/NOPB application, or LM4128CMF-3.3/NOPB equivalent, this page provides verified specifications, validated pin functions, confirmed thermal and load regulation performance, and real-world application context for precision analog design and low-power embedded systems.
Technical Context
The LM4128CMF-3.3/NOPB uses a band-gap-derived reference core optimized for micropower operation, eliminating need for external stabilization capacitors while maintaining stability with capacitive loads up to 10 µF. Its enable-controlled architecture allows seamless integration into power-gated subsystems.
Designed as a series reference, it achieves low dropout (175–400 mV at 10 mA), high PSRR (>60 dB at 100 Hz), and low 0.1–10 Hz noise (310 µVPP). The C-grade variant ensures 100 ppm/°C max tempco and ±0.5% initial tolerance over full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±0.5% initial accuracy (C-grade) - enables direct interface with 3.3 V ADCs and DACs without trimming. |
| Temperature Coefficient | 100 ppm/°C max - limits drift to ±132 ppm over −40°C to +125°C, supporting precision measurement in wide-temp environments. |
| Supply Current | 60 µA typical - reduces quiescent power to 0.33 mW at 5.5 V input, critical for multi-year battery life in IoT sensors. |
| Shutdown Current | 3–7 µA with EN = 0 V - allows >90% system-level power reduction during idle cycles in portable equipment. |
| Dropout Voltage | 175–400 mV at 10 mA - permits operation from single-cell Li-ion (3.0–4.2 V) or regulated 3.6 V rails with margin. |
| Load Regulation | 25–120 ppm/mA - maintains <±0.4 mV error across 0–20 mA load, suitable for driving op-amp bias networks and ADC references. |
| Long-Term Stability | 50 ppm over 1000 hours - ensures calibration integrity in medical and test equipment without periodic recalibration. |
Pinout & Package
LM4128CMF-3.3/NOPB is housed in a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, 2.9 mm × 1.6 mm footprint, and exposed pad optional for thermal relief. Pin 1 is N/C (no connect); pins are arranged top-view with standard DBV orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain floating; no internal connection - PCB pad may be omitted or left unconnected to reduce parasitic coupling. |
| 2 (GND) | Analog ground reference | Primary return path for reference core and enable circuitry; requires low-impedance connection to clean analog ground plane. |
| 3 (EN) | Active-high enable input | Drives internal regulator when ≥65% of VIN; pulls to GND or floats to disable - compatible with GPIO or open-drain logic. |
| 4 (VIN) | Input supply rail | Accepts 3.7–5.5 V (≥VREF + 400 mV); must be bypassed with ≥0.1 µF ceramic capacitor per layout guidelines. |
| 5 (VREF) | Precision 3.3 V output | Low-noise, low-drift reference source; stable with 0–10 µF capacitive loads; drives up to 20 mA with <0.5% regulation error. |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to ≤7 µA, enabling rapid power cycling in energy-harvesting and wake-on-event systems. |
| No external stabilization capacitor required | Eliminates BOM cost and board space for compensation cap while ensuring stability with 10 µF output capacitance. |
| Stable with low-ESR ceramic capacitors | Supports X5R/X7R dielectrics down to 0.1 µF input cap - simplifies layout and improves transient response vs. tantalum alternatives. |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault conditions - prevents thermal runaway and enables robust field deployment. |
| −40°C to +125°C operation | Validated performance across full automotive and industrial junction temperature range without derating. |
Applications
| Instrumentation & Process Control | Data Acquisition Systems |
|---|---|
Use Scenario: High-resolution sensor signal conditioning in factory-floor PLC modules with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Precision 3.3 V reference for 16-bit SAR ADCs and programmable gain amplifiers. Use Value: ±0.5% initial accuracy and 100 ppm/°C tempco ensure <±1 LSB error over temperature, meeting IEC 61000-6-2 immunity requirements. |
Use Scenario: Portable handheld multimeter with dual-range voltage measurement and auto-ranging logic. IC Role / Device Role / Timing Role: Stable reference for dual-slope integrator and microcontroller ADC subsystem. Use Value: 60 µA quiescent current extends battery life to >500 hours on two AA cells; enable pin synchronizes reference activation with measurement cycle. |
| Portable, Battery-Powered Equipment | Automotive & Industrial Electronics |
Use Scenario: Wireless environmental sensor node powered by coin-cell battery, transmitting temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Reference for ultra-low-power MCU ADC and analog front-end during active sensing phase. Use Value: 3 µA shutdown current minimizes standby drain; 310 µVPP (0.1–10 Hz) noise preserves SNR in thermistor bridge measurements. |
Use Scenario: Engine control unit (ECU) auxiliary voltage monitor for 3.3 V logic rail health diagnostics. IC Role / Device Role / Timing Role: Independent reference for comparator-based overvoltage/undervoltage detection circuit. Use Value: −40°C to +125°C guaranteed operation ensures reliability under hood thermal cycling; indefinite short-circuit tolerance handles wiring faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3033AIDBZR | 3.3 V, ±0.2% initial accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-3 - no enable pin, lower tempco but fixed output only. | Best for space-constrained designs where shutdown control is unnecessary and tighter tempco is prioritized over enable flexibility. | Select REF3033AIDBZR when system-level power sequencing eliminates need for per-device enable control and long-term stability <30 ppm is required. |
| MAX6033AEUR+T | 3.3 V, ±0.1% initial accuracy, 30 ppm/°C, 65 µA IQ, SOT-23-5 - includes enable, but rated only to +85°C ambient (not junction). | Suitable for commercial-grade portable devices; not qualified for extended temperature industrial or automotive use. | Choose MAX6033AEUR+T for cost-sensitive consumer electronics where −40°C to +125°C junction rating is not mandatory. |
Compared with REF3033AIDBZR and MAX6033AEUR+T, LM4128CMF-3.3/NOPB uniquely balances C-grade accuracy (±0.5%), full industrial temperature support, integrated enable, and proven 10 µF capacitive load stability - making it optimal for ruggedized portable instrumentation requiring both low power and wide-temp reliability.
Availability
LM4128CMF-3.3/NOPB is available at Aetrix Electronics and suitable for instrumentation & process control, portable battery-powered equipment, and automotive & industrial electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128CMF-3.3/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 manufacturing.
LM4128CMF-3.3/NOPB belongs to TI's precision micropower voltage reference product line, engineered specifically for space-constrained, low-power applications demanding high accuracy and wide-temperature operation without external compensation components.
FAQ
What is the maximum load current supported by LM4128CMF-3.3/NOPB?
The LM4128CMF-3.3/NOPB supports up to 20 mA output current while maintaining specified load regulation (25–120 ppm/mA). At 20 mA, dropout remains within 400 mV, and output voltage deviation stays within ±0.5% of 3.3 V under full temperature range. Exceeding 20 mA risks exceeding thermal limits and violating accuracy specs.
Does LM4128CMF-3.3/NOPB require an input capacitor, and what value is recommended?
Yes, LM4128CMF-3.3/NOPB requires a minimum 0.1 µF ceramic input capacitor (X5R/X7R) for stable operation. When using an output capacitor (COUT), CIN must be ≥ COUT; for COUT = 1 µF, CIN ≥ 1 µF is advised. Larger values (4.7–22 µF) further reduce startup overshoot and supply noise coupling into the 3.3 V reference output.
What is the enable pin behavior of LM4128CMF-3.3/NOPB, and how is it interfaced?
The EN pin of LM4128CMF-3.3/NOPB is active-high with VIH ≥ 65% of VIN and VIL ≤ 35% of VIN. It features an internal ~2 µA pull-up, so leaving it unconnected enables the device. For controlled shutdown, drive EN to GND or use an open-drain GPIO. Do not apply EN > VIN - that violates absolute maximum ratings and may damage the part.
How does LM4128CMF-3.3/NOPB perform in terms of output noise, and over what bandwidth?
LM4128CMF-3.3/NOPB delivers 310 µVPP (peak-to-peak) output noise over 0.1–10 Hz - critical for high-resolution DC measurements. Its broadband noise density is <10 µV/√Hz above 10 Hz, and PSRR exceeds 60 dB at 100 Hz. This noise profile is measured under standard conditions (VIN = 5 V, ILOAD = 0 A, no COUT) and remains stable with capacitive loads up to 10 µF.
Is LM4128CMF-3.3/NOPB qualified for automotive applications?
No - LM4128CMF-3.3/NOPB is the commercial-grade C-version. Automotive-qualified variants are designated LM4128xQ (e.g., LM4128CQMF-3.3/NOPB), which meet AEC-Q100 Grade 1 (−40°C to +125°C) and are manufactured on TI's automotive flow. The "C" grade in LM4128CMF-3.3/NOPB refers to accuracy grade (±0.5%), not automotive qualification.
LM4128CMF-3.3/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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 310µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3.7V ~ 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-3.3/NOPB FAQ
1.How can I place an order for LM4128CMF-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMF-3.3/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-3.3/NOPB reliable?
The price and inventory of LM4128CMF-3.3/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-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CMF-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMF-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMF-3.3/NOPB?
LM4128CMF-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMF-3.3/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-3.3/NOPB?
For technical support, including LM4128CMF-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMF-3.3/NOPB requirements.
6.How does Aetrix verify that LM4128CMF-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CMF-3.3/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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CMF-3.3/NOPB?
All LM4128CMF-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMF-3.3/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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4128CMF-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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