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Texas Instruments LM4128DMF-3.3/NOPB
- Part No.:
- LM4128DMF-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DMF-3.3/NOPB.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,041
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Product details
Overview
LM4128DMF-3.3/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 3.3 V output with ±0.5% initial accuracy (C grade), 100 ppm/°C max 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 portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the LM4128DMF-3.3/NOPB datasheet, LM4128DMF-3.3/NOPB pinout, LM4128DMF-3.3/NOPB application, or LM4128DMF-3.3/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), line regulation (85 ppm/V), load regulation (25–120 ppm/mA), noise performance (310 µVPP, 0.1–10 Hz), and stable operation with capacitive loads up to 10 µF without external compensation.
Technical Context
The LM4128DMF-3.3/NOPB implements a band-gap-derived series reference architecture with internal enable control logic and low-dropout regulation. Its design eliminates need for external stabilization capacitors while maintaining stability with up to 10 µF output capacitance and tolerating input ripple via integrated filtering.
It uses a no-connect (N/C) pin to support package compatibility across voltage variants, employs a pull-up current source (~2 µA) on the EN pin, and guarantees operation over full industrial temperature range with thermal hysteresis ≤75 ppm and long-term stability ≤50 ppm over 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±0.5% initial accuracy (C grade) - ensures ADC/DAC reference accuracy within 16.5 mV tolerance at room temperature |
| Temperature Coefficient | 100 ppm/°C max - limits drift to ±12.1 µV/°C over −40°C to +125°C operating range |
| Supply Current | 60 µA typical - enables multi-year battery life in low-power sensor nodes and portable meters |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces system standby power by >90% vs active mode |
| Dropout Voltage | 175–400 mV at 10 mA - allows operation from 3.475 V input, compatible with single-cell Li-ion or 3.3 V LDO rails |
| Output Noise | 310 µVPP (0.1–10 Hz) - supports 16-bit+ resolution in precision analog front-ends without additional filtering |
| Load Current Capability | Up to 20 mA - drives multiple op-amp bias networks or SAR ADC reference inputs directly |
Pinout & Package
LM4128DMF-3.3/NOPB is housed in a 5-pin SOT-23 (DBV) package per JEDEC MO-178AB, with 1.6 mm × 2.9 mm footprint and 0.95 mm height. Pin 1 is N/C (no connect), pin 2 is GND, pin 3 is EN, pin 4 is VIN, and pin 5 is VREF. The package is RoHS-compliant, lead-finished with matte tin, and rated MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must be left floating; not internally bonded - avoids unintended parasitic coupling or ESD path |
| Pin 2 (GND) | Analog ground reference | Primary return path for reference current and load current; requires low-impedance PCB connection to minimize noise injection |
| Pin 3 (EN) | Enable control input | Active-high logic input; VIH ≥65% VIN, VIL ≤35% VIN - enables system-level power sequencing and sleep/wake control |
| Pin 4 (VIN) | Input supply rail | Accepts 3.7 V to 5.5 V (VREF + 400 mV min); supplies internal band-gap core and output buffer |
| Pin 5 (VREF) | Precision output node | Delivers regulated 3.3 V; must be decoupled locally with ceramic capacitor if used in high-dynamic-load applications |
Key Features
| Feature | Design Value |
|---|---|
| Stable with capacitive loads up to 10 µF | Eliminates need for external compensation network - simplifies layout and reduces BOM count in space-constrained designs |
| Low dropout voltage (≤400 mV) | Enables direct operation from 3.7 V Li-ion batteries or post-regulation 3.3 V rails without headroom loss |
| Enable pin with 3 µA shutdown current | Supports ultra-low-power wake-on-event architectures in IoT edge sensors and portable medical devices |
| Stable with low-ESR ceramic capacitors | Permits use of compact X5R/X7R MLCCs for CIN/COUT - improves reliability vs tantalum and reduces board area |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault - prevents thermal runaway and enables robust field deployment |
Applications
| Instrumentation & Process Control | Portable Battery-Powered Equipment |
|---|---|
Use Scenario: High-accuracy analog signal conditioning in handheld multimeters and loop calibrators. IC Role / Device Role / Timing Role: Primary voltage reference for 16-bit SAR ADCs and precision DACs driving 4–20 mA transmitters. Use Value: ±0.5% initial accuracy and 100 ppm/°C tempco ensure measurement repeatability across environmental shifts without recalibration. | Use Scenario: Power management in wearable health monitors with continuous ECG/PPG sensing. IC Role / Device Role / Timing Role: Stable 3.3 V reference for low-noise analog front-end amplifiers and ADC biasing. Use Value: 310 µVPP (0.1–10 Hz) noise and 60 µA quiescent current extend battery runtime while preserving signal integrity. |
| Data Acquisition Systems | Automotive & Industrial Electronics |
Use Scenario: Modular DAQ modules for factory floor monitoring with isolated analog inputs. IC Role / Device Role / Timing Role: Reference source for multiplexed 18-bit sigma-delta ADCs sampling thermocouples and RTDs. Use Value: Long-term stability ≤50 ppm/1000 hrs and thermal hysteresis ≤75 ppm maintain calibration integrity over extended deployments. | Use Scenario: Engine control unit (ECU) auxiliary sensor interface for pressure and position feedback. IC Role / Device Role / Timing Role: Precision reference for ratiometric sensor excitation and analog-to-digital conversion in harsh environments. Use Value: −40°C to +125°C junction temperature rating and AEC-Q100 qualified variants ensure functional safety compliance in under-hood applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3333AIDBVR | 3.3 V, ±0.1% initial accuracy (A grade), 30 ppm/°C max tempco, 3.9 µA IQ - lower accuracy grade but tighter tempco and lower quiescent current | Preferred for ultra-low-power, high-stability applications where <10 µA supply current is critical and cost permits higher-grade tolerance | Select REF3333AIDBVR when long-term drift and temperature stability outweigh raw initial accuracy requirements |
| MAX6029AEUR+T | 3.3 V, ±0.2% initial accuracy, 50 ppm/°C max tempco, 12 µA IQ, SOT-23-3 - 3-pin package, no enable function, lower supply current but no shutdown mode | Suitable for fixed-on applications without power cycling; lacks EN pin and has reduced pin count, limiting flexibility in dynamic systems | Choose MAX6029AEUR+T for space-constrained, always-on circuits where enable control is unnecessary and minimal IQ is prioritized |
Compared with LM4128DMF-3.3/NOPB, REF3333AIDBVR offers superior temperature stability and lower quiescent current but at higher cost and tighter initial tolerance, while MAX6029AEUR+T sacrifices enable functionality and initial accuracy for ultra-low IQ and smaller footprint - making LM4128DMF-3.3/NOPB optimal for balanced performance in battery-aware, enable-controlled systems.
Availability
LM4128DMF-3.3/NOPB is available at Aetrix Electronics and suitable for instrumentation & process control, portable battery-powered equipment, and data acquisition systems requiring stable component supply across extended production lifecycles.
Supply support for LM4128DMF-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, embedded processing, and digital signal technologies, with decades of expertise in precision analog ICs and industrial-grade components.
The LM4128 product line delivers micropower, low-drift series voltage references for space-constrained, battery-sensitive applications - designed specifically for instrumentation, portable test equipment, and high-reliability industrial sensing systems.
FAQ
What is the maximum input voltage for LM4128DMF-3.3/NOPB?
The LM4128DMF-3.3/NOPB supports a maximum input voltage of 5.5 V, with minimum input defined as VREF + 400 mV (i.e., ≥3.7 V at 10 mA load). Operation above 5.5 V risks exceeding absolute maximum ratings and may cause permanent damage. This 5.5 V ceiling aligns with standard 3.3 V and 5 V system rails, ensuring safe integration into mixed-voltage designs without external regulators.
Does LM4128DMF-3.3/NOPB require an input capacitor?
Yes, LM4128DMF-3.3/NOPB requires an input capacitor (CIN) for stable operation. The datasheet specifies CIN ≥ COUT, and when no output capacitor is used, CIN must be at least 0.1 µF. A ceramic X5R or X7R capacitor placed close to the VIN and GND pins suppresses supply noise and prevents oscillation - omission risks instability, especially under transient load conditions or noisy power sources.
What is the function of the N/C pin on LM4128DMF-3.3/NOPB?
The N/C (no-connect) pin on LM4128DMF-3.3/NOPB is Pin 1 and is not internally bonded. It must be left electrically floating - neither tied to GND nor VIN. This pin maintains mechanical and thermal symmetry across the SOT-23 package family for all LM4128 voltage variants, enabling consistent assembly and reflow behavior without introducing parasitic paths or ESD vulnerabilities.
Can LM4128DMF-3.3/NOPB drive a 10 µF capacitive load?
Yes, LM4128DMF-3.3/NOPB is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, including low-ESR ceramic types. This capability eliminates the need for external series resistance or isolation buffers, simplifying circuit design in applications like precision DAC buffers or high-capacitance sensor excitation networks where fast settling and low noise are critical.
What is the thermal hysteresis specification for LM4128DMF-3.3/NOPB?
The thermal hysteresis for LM4128DMF-3.3/NOPB is 75 ppm over the −40°C to +125°C junction temperature range. This value represents the maximum reversible change in output voltage at 25°C after cycling between temperature extremes - a key metric for applications requiring repeatable calibration, such as portable lab equipment and field-deployed sensor nodes where ambient temperature swings occur frequently.
LM4128DMF-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:
- ±1%
- 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
LM4128DMF-3.3/NOPB FAQ
1.How can I place an order for LM4128DMF-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DMF-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 LM4128DMF-3.3/NOPB reliable?
The price and inventory of LM4128DMF-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 LM4128DMF-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128DMF-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DMF-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DMF-3.3/NOPB?
LM4128DMF-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DMF-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 LM4128DMF-3.3/NOPB?
For technical support, including LM4128DMF-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DMF-3.3/NOPB requirements.
6.How does Aetrix verify that LM4128DMF-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128DMF-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 LM4128DMF-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128DMF-3.3/NOPB?
All LM4128DMF-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DMF-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 LM4128DMF-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4128DMF-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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