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Texas Instruments LM4128DMFX-3.3/NOPB
- Part No.:
- LM4128DMFX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DMFX-3.3/NOPB.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,441
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Product details
Overview
LM4128DMFX-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 (Grade C), 100 ppm/°C max temperature coefficient, and 60 µA supply current. It supports 20 mA output current, features an enable pin for 3 µA shutdown mode, and operates from −40°C to +125°C junction temperature - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128DMFX-3.3/NOPB datasheet, LM4128DMFX-3.3/NOPB pinout, LM4128DMFX-3.3/NOPB application, or LM4128DMFX-3.3/NOPB equivalent, key selection criteria include its 3.3 V fixed output, low dropout (400 mV at 10 mA), stability with up to 10 µF capacitive loads, and absence of required external stabilizing capacitor - enabling compact, low-power analog front-end designs.
Technical Context
The LM4128DMFX-3.3/NOPB implements a band-gap-based series voltage reference architecture with internal enable logic and thermal compensation. Its design eliminates need for external stabilization while maintaining stability with ceramic output capacitors up to 10 µF and load currents up to 20 mA.
It operates across VIN = VREF + 400 mV to 5.5 V, supports indefinite short-circuit protection (75 mA limit), and achieves 310 µVPP (0.1–10 Hz) output noise. The enable pin accepts logic-level control with VIH ≥65% VIN and VIL ≤35% VIN, and features internal 2 µA pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±0.5% initial accuracy (Grade C) - ensures stable ADC/DAC reference without calibration in mid-precision systems. |
| Temperature Coefficient | 100 ppm/°C max - limits drift to ±132 ppm over −40°C to +125°C, supporting industrial-grade measurement stability. |
| Supply Current | 60 µA typical - enables multi-year operation from coin-cell batteries in always-on sensor nodes. |
| Shutdown Current | 3–7 µA with EN = 0 V - allows ultra-low-power sleep states in portable equipment. |
| Dropout Voltage | 400 mV max at 10 mA - permits operation from 3.7 V Li-ion cells down to ~3.4 V before regulation loss. |
| Output Noise | 310 µVPP (0.1–10 Hz) - suitable for 12-bit to 14-bit SAR ADCs without additional filtering. |
| Load Regulation | 25–120 ppm/mA - maintains <±0.4 mV error across 0–20 mA load, critical for precision current sources. |
Pinout & Package
LM4128DMFX-3.3/NOPB uses the 5-pin SOT-23 (DBV) package (Package Number DBV, R-PDSO-G5), with exposed pad not electrically connected. Pin 1 is N/C (no connect); pins are arranged top-view as labeled in TI SNVS475E.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must be left floating; no internal connection - avoids unintended parasitic paths or ESD coupling. |
| Pin 2 (GND) | Analog ground reference | Primary return path for reference current; requires low-impedance PCB connection to minimize noise injection. |
| Pin 3 (EN) | Enable control input | Active-high logic input; internal 2 µA pull-up allows direct tie-to-VIN or microcontroller GPIO drive. |
| Pin 4 (VIN) | Input supply rail | Accepts 3.7 V to 5.5 V; must exceed VREF by ≥400 mV for regulation - defines minimum battery voltage headroom. |
| Pin 5 (VREF) | Precision output terminal | Delivers regulated 3.3 V; stable with 0–10 µF ceramic capacitive loads - simplifies layout vs shunt references. |
Key Features
| Feature | Design Value |
|---|---|
| Enable pin with 3 µA shutdown | Reduces system standby power by >95% versus always-on references - essential for IoT edge sensors. |
| No external stabilization capacitor required | Eliminates BOM cost and board space for dedicated CSTAB, while retaining stability with 10 µF COUT. |
| Stable with low-ESR ceramic capacitors | Supports X5R/X7R MLCCs (0.1–10 µF) - avoids costly tantalum or electrolytic alternatives and improves reliability. |
| Indefinite short-circuit protection | Limits fault current to 75 mA - prevents thermal runaway during test or miswiring without external current limiting. |
| −40°C to +125°C operating range | Validated performance across full automotive and industrial ambient ranges - no derating needed for harsh environments. |
Applications
| Portable Data Acquisition | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Handheld multimeter sampling analog signals via 12-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 3.3 V reference for ADC conversion and microcontroller VREF input. Use Value: ±0.5% initial accuracy and 100 ppm/°C tempco ensure <±1 LSB error across temperature without recalibration. |
Use Scenario: Portable gas detector using electrochemical sensor and low-power MCU. IC Role / Device Role / Timing Role: Supplies precision bias voltage for sensor conditioning amplifier and ADC reference. Use Value: 60 µA quiescent current extends 2xAA battery life beyond 2 years in periodic-readout mode. |
| Industrial Process Monitoring | Automotive Body Control Modules |
Use Scenario: DIN-rail mounted temperature transmitter with 4–20 mA loop output. IC Role / Device Role / Timing Role: References DAC generating loop current setpoint and powers isolated signal chain. Use Value: 20 mA output capability drives DAC reference and op-amp bias simultaneously without droop. |
Use Scenario: In-cabin occupancy sensor node with wake-on-motion and CAN interface. IC Role / Device Role / Timing Role: Supplies stable 3.3 V to MCU, RF transceiver, and analog front-end during sleep/wake cycles. Use Value: Enable pin synchronizes power-down with MCU deep-sleep state, achieving <10 µA system standby. |
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 (Grade A), 50 ppm/°C max, 50 µA IQ, SOT-23-3 - no enable pin, 3-pin footprint. | Requires external enable circuitry if shutdown needed; lower tempco suits higher-precision metrology. | Select when highest accuracy and lowest drift outweigh need for integrated enable and 5-pin flexibility. |
| MAX6029AEUR+T | 3.3 V, ±0.1% initial accuracy, 30 ppm/°C max, 75 µA IQ, SOT-23-5 - includes enable, but rated only to +85°C. | Limited to commercial/industrial ambient; unsuitable for under-hood automotive or extended-temp industrial use. | Select for cost-sensitive consumer applications where extended temperature range is not required. |
Compared with REF3033AIDBZR and MAX6029AEUR+T, LM4128DMFX-3.3/NOPB uniquely balances Grade C accuracy (±0.5%), full −40°C to +125°C operation, integrated enable, and SOT-23-5 compatibility - making it optimal for ruggedized portable and automotive-qualified designs where moderate precision meets wide-temperature reliability.
Availability
LM4128DMFX-3.3/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial process monitoring, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128DMFX-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 analog ICs and industrial-grade reliability.
LM4128DMFX-3.3/NOPB belongs to TI's precision micropower voltage reference product line, designed specifically for space-constrained, battery-operated, and high-stability measurement systems demanding low drift and minimal quiescent power.
FAQ
What is the maximum input voltage for LM4128DMFX-3.3/NOPB?
The absolute maximum input voltage for LM4128DMFX-3.3/NOPB is 6 V, but the recommended operating maximum is 5.5 V per the Electrical Characteristics table. Exceeding 5.5 V risks violating absolute maximum ratings and may cause permanent damage or parametric shift. For reliable operation, VIN must remain within VREF + 400 mV to 5.5 V - i.e., 3.7 V to 5.5 V for LM4128DMFX-3.3/NOPB.
Does LM4128DMFX-3.3/NOPB require an input capacitor?
Yes, LM4128DMFX-3.3/NOPB requires an input capacitor (CIN). Per TI SNVS475E Section "Component Selection", CIN must be ≥ COUT; if no output capacitor is used, CIN must be ≥0.1 µF. A ceramic X5R or X7R capacitor is recommended, placed close to the device to suppress supply noise and improve startup behavior. Omitting CIN risks instability or excessive output overshoot.
What does the 'D' grade signify in LM4128DMFX-3.3/NOPB?
The 'D' in LM4128DMFX-3.3/NOPB denotes Grade D performance: ±1.0% initial output voltage accuracy and 100 ppm/°C maximum temperature coefficient over −40°C to +125°C. This grade targets cost-sensitive applications where moderate precision suffices - distinct from Grade A (±0.1%, 75 ppm/°C) or Grade C (±0.5%, 100 ppm/°C). The 'MFX' suffix confirms SOT-23-5 (DBV) packaging and tape-and-reel delivery.
Can LM4128DMFX-3.3/NOPB drive a 10 µF output capacitor?
Yes, LM4128DMFX-3.3/NOPB is explicitly characterized for stability with capacitive loads up to 10 µF, as stated in the Features section and confirmed in the "Stable with Low ESR Ceramic Capacitors" bullet. Using a 10 µF ceramic output capacitor improves load transient response when switching between light and heavy loads, though it increases turn-on time (e.g., ~78.8 µs to 90% VREF). No series resistance or isolation is required.
Is LM4128DMFX-3.3/NOPB qualified for automotive applications?
No, LM4128DMFX-3.3/NOPB is not AEC-Q100 qualified. Only variants with 'Q' suffix (e.g., LM4128DQMF-3.3/NOPB) are automotive-grade and manufactured on TI's automotive flow. LM4128DMFX-3.3/NOPB is rated for −40°C to +125°C junction temperature and suitable for industrial applications, but lacks the qualification testing, traceability, and manufacturing controls required for automotive safety-critical systems.
LM4128DMFX-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
LM4128DMFX-3.3/NOPB FAQ
1.How can I place an order for LM4128DMFX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DMFX-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 LM4128DMFX-3.3/NOPB reliable?
The price and inventory of LM4128DMFX-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 LM4128DMFX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128DMFX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DMFX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DMFX-3.3/NOPB?
LM4128DMFX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DMFX-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 LM4128DMFX-3.3/NOPB?
For technical support, including LM4128DMFX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DMFX-3.3/NOPB requirements.
6.How does Aetrix verify that LM4128DMFX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128DMFX-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 LM4128DMFX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128DMFX-3.3/NOPB?
All LM4128DMFX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DMFX-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 LM4128DMFX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4128DMFX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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